<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:9d68e55d-4e92-43fa-9dd0-19576f7d80fe,g:76691f42-c82e-4967-a177-e7f2131596df-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:rmb="http://www.rapidmicrobio.com/20251231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.rapidmicrobio.com/20251231">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af-sub/2025" schemaLocation="https://xbrl.sec.gov/cyd/2025/cyd-af-sub-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="rmb-20251231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="rmb-20251231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="rmb-20251231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="rmb-20251231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.rapidmicrobio.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AuditInformation" roleURI="http://www.rapidmicrobio.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Consolidatedbalancesheets" roleURI="http://www.rapidmicrobio.com/role/Consolidatedbalancesheets">
        <link:definition>9952151 - Statement - Consolidated balance sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedbalancesheetsParentheticals" roleURI="http://www.rapidmicrobio.com/role/ConsolidatedbalancesheetsParentheticals">
        <link:definition>9952152 - Statement - Consolidated balance sheets (Parentheticals)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Consolidatedstatementsofoperations" roleURI="http://www.rapidmicrobio.com/role/Consolidatedstatementsofoperations">
        <link:definition>9952153 - Statement - Consolidated statements of operations</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Consolidatedstatementsofcomprehensiveloss" roleURI="http://www.rapidmicrobio.com/role/Consolidatedstatementsofcomprehensiveloss">
        <link:definition>9952154 - Statement - Consolidated statements of comprehensive loss</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Consolidatedstatementsofstockholdersequity" roleURI="http://www.rapidmicrobio.com/role/Consolidatedstatementsofstockholdersequity">
        <link:definition>9952155 - Statement - Consolidated statements of stockholders' equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Consolidatedstatementsofcashflows" roleURI="http://www.rapidmicrobio.com/role/Consolidatedstatementsofcashflows">
        <link:definition>9952156 - Statement - Consolidated statements of cash flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Natureofthebusinessandbasisofpresentation" roleURI="http://www.rapidmicrobio.com/role/Natureofthebusinessandbasisofpresentation">
        <link:definition>9952157 - Disclosure - Nature of the business and basis of presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Summaryofsignificantaccountingpolicies" roleURI="http://www.rapidmicrobio.com/role/Summaryofsignificantaccountingpolicies">
        <link:definition>9952158 - Disclosure - Summary of significant accounting policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Fairvalueoffinancialassetsandliabilities" roleURI="http://www.rapidmicrobio.com/role/Fairvalueoffinancialassetsandliabilities">
        <link:definition>9952159 - Disclosure - Fair value of financial assets and liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Investments" roleURI="http://www.rapidmicrobio.com/role/Investments">
        <link:definition>9952160 - Disclosure - Investments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Inventorynet" roleURI="http://www.rapidmicrobio.com/role/Inventorynet">
        <link:definition>9952161 - Disclosure - Inventory, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Prepaidexpensesandothercurrentassets" roleURI="http://www.rapidmicrobio.com/role/Prepaidexpensesandothercurrentassets">
        <link:definition>9952162 - Disclosure - Prepaid expenses and other current assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Propertyandequipmentnet" roleURI="http://www.rapidmicrobio.com/role/Propertyandequipmentnet">
        <link:definition>9952163 - Disclosure - Property and equipment, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Accruedexpensesandothercurrentliabilities" roleURI="http://www.rapidmicrobio.com/role/Accruedexpensesandothercurrentliabilities">
        <link:definition>9952164 - Disclosure - Accrued expenses and other current liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Notespayablenet" roleURI="http://www.rapidmicrobio.com/role/Notespayablenet">
        <link:definition>9952165 - Disclosure - Notes payable, net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Commonstockandcommonstockwarrants" roleURI="http://www.rapidmicrobio.com/role/Commonstockandcommonstockwarrants">
        <link:definition>9952166 - Disclosure - Common stock and common stock warrants</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Stockbasedcompensation" roleURI="http://www.rapidmicrobio.com/role/Stockbasedcompensation">
        <link:definition>9952167 - Disclosure - Stock-based compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Incometaxes" roleURI="http://www.rapidmicrobio.com/role/Incometaxes">
        <link:definition>9952168 - Disclosure - Income taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Netlosspershare" roleURI="http://www.rapidmicrobio.com/role/Netlosspershare">
        <link:definition>9952169 - Disclosure - Net loss per share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.rapidmicrobio.com/role/Leases">
        <link:definition>9952170 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Commitmentsandcontingencies" roleURI="http://www.rapidmicrobio.com/role/Commitmentsandcontingencies">
        <link:definition>9952171 - Disclosure - Commitments and contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Benefitplans" roleURI="http://www.rapidmicrobio.com/role/Benefitplans">
        <link:definition>9952172 - Disclosure - Benefit plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesPolicies" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesPolicies">
        <link:definition>9955511 - Disclosure - Summary of significant accounting policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesTables" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesTables">
        <link:definition>9955512 - Disclosure - Summary of significant accounting policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairvalueoffinancialassetsandliabilitiesTables" roleURI="http://www.rapidmicrobio.com/role/FairvalueoffinancialassetsandliabilitiesTables">
        <link:definition>9955513 - Disclosure - Fair value of financial assets and liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsTables" roleURI="http://www.rapidmicrobio.com/role/InvestmentsTables">
        <link:definition>9955514 - Disclosure - Investments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventorynetTables" roleURI="http://www.rapidmicrobio.com/role/InventorynetTables">
        <link:definition>9955515 - Disclosure - Inventory, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PrepaidexpensesandothercurrentassetsTables" roleURI="http://www.rapidmicrobio.com/role/PrepaidexpensesandothercurrentassetsTables">
        <link:definition>9955516 - Disclosure - Prepaid expenses and other current assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyandequipmentnetTables" roleURI="http://www.rapidmicrobio.com/role/PropertyandequipmentnetTables">
        <link:definition>9955517 - Disclosure - Property and equipment, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedexpensesandothercurrentliabilitiesTables" roleURI="http://www.rapidmicrobio.com/role/AccruedexpensesandothercurrentliabilitiesTables">
        <link:definition>9955518 - Disclosure - Accrued expenses and other current liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NotespayablenetTables" roleURI="http://www.rapidmicrobio.com/role/NotespayablenetTables">
        <link:definition>9955519 - Disclosure - Notes payable, net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonstockandcommonstockwarrantsTables" roleURI="http://www.rapidmicrobio.com/role/CommonstockandcommonstockwarrantsTables">
        <link:definition>9955520 - Disclosure - Common stock and common stock warrants (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationTables" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationTables">
        <link:definition>9955521 - Disclosure - Stock-based compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesTables" roleURI="http://www.rapidmicrobio.com/role/IncometaxesTables">
        <link:definition>9955522 - Disclosure - Income taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetlosspershareTables" roleURI="http://www.rapidmicrobio.com/role/NetlosspershareTables">
        <link:definition>9955523 - Disclosure - Net loss per share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.rapidmicrobio.com/role/LeasesTables">
        <link:definition>9955524 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NatureofthebusinessandbasisofpresentationDetails" roleURI="http://www.rapidmicrobio.com/role/NatureofthebusinessandbasisofpresentationDetails">
        <link:definition>9955525 - Disclosure - Nature of the business and basis of presentation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesScheduleofConcentrationRiskDetails" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesScheduleofConcentrationRiskDetails">
        <link:definition>9955526 - Disclosure - Summary of significant accounting policies - Schedule of Concentration Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesNarrativeDetails">
        <link:definition>9955527 - Disclosure - Summary of significant accounting policies - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesPropertyandEquipmentDetails" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesPropertyandEquipmentDetails">
        <link:definition>9955528 - Disclosure - Summary of significant accounting policies - Property and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesProductWarrantiesDetails" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesProductWarrantiesDetails">
        <link:definition>9955529 - Disclosure - Summary of significant accounting policies - Product Warranties (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SummaryofsignificantaccountingpoliciesDisaggregatedRevenueDetails" roleURI="http://www.rapidmicrobio.com/role/SummaryofsignificantaccountingpoliciesDisaggregatedRevenueDetails">
        <link:definition>9955530 - Disclosure - Summary of significant accounting policies - Disaggregated Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairvalueoffinancialassetsandliabilitiesScheduleofAssetsandLiabilitiesMeasuredonaRecurringBasisDetails" roleURI="http://www.rapidmicrobio.com/role/FairvalueoffinancialassetsandliabilitiesScheduleofAssetsandLiabilitiesMeasuredonaRecurringBasisDetails">
        <link:definition>9955531 - Disclosure - Fair value of financial assets and liabilities - Schedule of Assets and Liabilities Measured on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairvalueoffinancialassetsandliabilitiesNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/FairvalueoffinancialassetsandliabilitiesNarrativeDetails">
        <link:definition>9955532 - Disclosure - Fair value of financial assets and liabilities - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairvalueoffinancialassetsandliabilitiesScheduleofWarrantLiabilityDeterminedUsingKeyInputsfortheBlackScholesOptionPricingModelDetails" roleURI="http://www.rapidmicrobio.com/role/FairvalueoffinancialassetsandliabilitiesScheduleofWarrantLiabilityDeterminedUsingKeyInputsfortheBlackScholesOptionPricingModelDetails">
        <link:definition>9955533 - Disclosure - Fair value of financial assets and liabilities - Schedule of Warrant Liability Determined Using Key Inputs for the Black-Scholes Option Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairvalueoffinancialassetsandliabilitiesScheduleoftheWarrantLiabilityMeasuredatFairValueonRecurringBasisDetails" roleURI="http://www.rapidmicrobio.com/role/FairvalueoffinancialassetsandliabilitiesScheduleoftheWarrantLiabilityMeasuredatFairValueonRecurringBasisDetails">
        <link:definition>9955534 - Disclosure - Fair value of financial assets and liabilities - Schedule of the Warrant Liability Measured at Fair Value on Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsScheduleofInvestmentsDetails" roleURI="http://www.rapidmicrobio.com/role/InvestmentsScheduleofInvestmentsDetails">
        <link:definition>9955535 - Disclosure - Investments - Schedule of Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InvestmentsNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/InvestmentsNarrativeDetails">
        <link:definition>9955536 - Disclosure - Investments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventorynetScheduleofInventoryNetDetails" roleURI="http://www.rapidmicrobio.com/role/InventorynetScheduleofInventoryNetDetails">
        <link:definition>9955537 - Disclosure - Inventory, net - Schedule of Inventory, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventorynetNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/InventorynetNarrativeDetails">
        <link:definition>9955538 - Disclosure - Inventory, net - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PrepaidexpensesandothercurrentassetsDetails" roleURI="http://www.rapidmicrobio.com/role/PrepaidexpensesandothercurrentassetsDetails">
        <link:definition>9955539 - Disclosure - Prepaid expenses and other current assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyandequipmentnetScheduleofPropertyandEquipmentDetails" roleURI="http://www.rapidmicrobio.com/role/PropertyandequipmentnetScheduleofPropertyandEquipmentDetails">
        <link:definition>9955540 - Disclosure - Property and equipment, net - Schedule of Property and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyandequipmentnetNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/PropertyandequipmentnetNarrativeDetails">
        <link:definition>9955541 - Disclosure - Property and equipment, net - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccruedexpensesandothercurrentliabilitiesDetails" roleURI="http://www.rapidmicrobio.com/role/AccruedexpensesandothercurrentliabilitiesDetails">
        <link:definition>9955542 - Disclosure - Accrued expenses and other current liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NotespayablenetScheduleofNotesPayableNetDetails" roleURI="http://www.rapidmicrobio.com/role/NotespayablenetScheduleofNotesPayableNetDetails">
        <link:definition>9955543 - Disclosure - Notes payable, net - Schedule of Notes Payable, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NotespayablenetNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/NotespayablenetNarrativeDetails">
        <link:definition>9955544 - Disclosure - Notes payable, net - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NotespayablenetScheduleofDebtPrincipalPaymentsDetails" roleURI="http://www.rapidmicrobio.com/role/NotespayablenetScheduleofDebtPrincipalPaymentsDetails">
        <link:definition>9955545 - Disclosure - Notes payable, net - Schedule of Debt Principal Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonstockandcommonstockwarrantsNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/CommonstockandcommonstockwarrantsNarrativeDetails">
        <link:definition>9955546 - Disclosure - Common stock and common stock warrants - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommonstockandcommonstockwarrantsWarrantsDetails" roleURI="http://www.rapidmicrobio.com/role/CommonstockandcommonstockwarrantsWarrantsDetails">
        <link:definition>9955547 - Disclosure - Common stock and common stock warrants - Warrants (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationNarrativeDetails">
        <link:definition>9955548 - Disclosure - Stock-based compensation - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationStockOptionActivityDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationStockOptionActivityDetails">
        <link:definition>9955549 - Disclosure - Stock-based compensation - Stock Option Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationScheduleofBlackScholesOptionPricingModelDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationScheduleofBlackScholesOptionPricingModelDetails">
        <link:definition>9955550 - Disclosure - Stock-based compensation - Schedule of Black-Scholes Option-Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationScheduleofRestrictedStockActivityDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationScheduleofRestrictedStockActivityDetails">
        <link:definition>9955551 - Disclosure - Stock-based compensation - Schedule of Restricted Stock Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationScheduleofESPPBlackScholesOptionPricingModelDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationScheduleofESPPBlackScholesOptionPricingModelDetails">
        <link:definition>9955552 - Disclosure - Stock-based compensation - Schedule of ESPP Black-Scholes Option-Pricing Model (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockbasedcompensationScheduleofStockBasedCompensationExpenseDetails" roleURI="http://www.rapidmicrobio.com/role/StockbasedcompensationScheduleofStockBasedCompensationExpenseDetails">
        <link:definition>9955553 - Disclosure - Stock-based compensation - Schedule of Stock-Based Compensation Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesLossBeforeIncomeTaxExpenseDetails" roleURI="http://www.rapidmicrobio.com/role/IncometaxesLossBeforeIncomeTaxExpenseDetails">
        <link:definition>9955554 - Disclosure - Income taxes - Loss Before Income Tax Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesComponentsofincometaxexpenseDetails" roleURI="http://www.rapidmicrobio.com/role/IncometaxesComponentsofincometaxexpenseDetails">
        <link:definition>9955555 - Disclosure - Income taxes - Components of income tax expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesEffectiveIncomeTaxRateReconciliationDetails" roleURI="http://www.rapidmicrobio.com/role/IncometaxesEffectiveIncomeTaxRateReconciliationDetails">
        <link:definition>9955556 - Disclosure - Income taxes - Effective Income Tax Rate Reconciliation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesNetDeferredTaxAssetsDetails" roleURI="http://www.rapidmicrobio.com/role/IncometaxesNetDeferredTaxAssetsDetails">
        <link:definition>9955557 - Disclosure - Income taxes - Net Deferred Tax Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncometaxesNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/IncometaxesNarrativeDetails">
        <link:definition>9955558 - Disclosure - Income taxes - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetlosspershareBasicandDilutedNetLossperShareAttributabletoCommonStockholdersDetails" roleURI="http://www.rapidmicrobio.com/role/NetlosspershareBasicandDilutedNetLossperShareAttributabletoCommonStockholdersDetails">
        <link:definition>9955559 - Disclosure - Net loss per share - Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetlosspershareScheduleofCommonStockExcludedFromComputationofDilutedNetLossperShareDetails" roleURI="http://www.rapidmicrobio.com/role/NetlosspershareScheduleofCommonStockExcludedFromComputationofDilutedNetLossperShareDetails">
        <link:definition>9955560 - Disclosure - Net loss per share - Schedule of Common Stock Excluded From Computation of Diluted Net Loss per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesNarrativeDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesNarrativeDetails">
        <link:definition>9955561 - Disclosure - Leases - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofSupplementalCashFlowInformationDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofSupplementalCashFlowInformationDetails">
        <link:definition>9955562 - Disclosure - Leases - Schedule of Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofSupplementalBalanceSheetInformationDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofSupplementalBalanceSheetInformationDetails">
        <link:definition>9955563 - Disclosure - Leases - Schedule of Supplemental Balance Sheet Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofLeaseExpenseDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofLeaseExpenseDetails">
        <link:definition>9955564 - Disclosure - Leases - Schedule of Lease Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofOperatingLeaseLiabilityMaturitiesDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofOperatingLeaseLiabilityMaturitiesDetails">
        <link:definition>9955565 - Disclosure - Leases - Schedule of Operating Lease Liability Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofOperatingLeaseLiabilityMaturitiesDetails_1" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofOperatingLeaseLiabilityMaturitiesDetails_1">
        <link:definition>9955565 - Disclosure - Leases - Schedule of Operating Lease Liability Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofFinanceLeaseLiabilityMaturitiesDetails" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofFinanceLeaseLiabilityMaturitiesDetails">
        <link:definition>9955566 - Disclosure - Leases - Schedule of Finance Lease Liability Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesScheduleofFinanceLeaseLiabilityMaturitiesDetails_1" roleURI="http://www.rapidmicrobio.com/role/LeasesScheduleofFinanceLeaseLiabilityMaturitiesDetails_1">
        <link:definition>9955566 - Disclosure - Leases - Schedule of Finance Lease Liability Maturities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandcontingenciesDetails" roleURI="http://www.rapidmicrobio.com/role/CommitmentsandcontingenciesDetails">
        <link:definition>9955567 - Disclosure - Commitments and contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitplansDetails" roleURI="http://www.rapidmicrobio.com/role/BenefitplansDetails">
        <link:definition>9955568 - Disclosure - Benefit plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="rmb_AuditorAbstract" abstract="true" name="AuditorAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_LeaseRightOfUseAsset" abstract="false" name="LeaseRightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_LeaseLiabilityCurrent" abstract="false" name="LeaseLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_WarrantLiabilityNoncurrent" abstract="false" name="WarrantLiabilityNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_LeaseLiabilityNoncurrent" abstract="false" name="LeaseLiabilityNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_NonCashInterestExpense" abstract="false" name="NonCashInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_LeaseNoncashExpense" abstract="false" name="LeaseNoncashExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_AccretionOfDebtSecuritiesAvailableForSale" abstract="false" name="AccretionOfDebtSecuritiesAvailableForSale" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_NoncashInvestingItemsAbstract" abstract="true" name="NoncashInvestingItemsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_NoncashFinancingItemsAbstract" abstract="true" name="NoncashFinancingItemsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_DebtIssuanceWarrantLiabilityIncurred" abstract="false" name="DebtIssuanceWarrantLiabilityIncurred" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_WarrantsIssued" abstract="false" name="WarrantsIssued" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_PrepaidExpensesAndOtherAssetsCurrentTextBlock" abstract="false" name="PrepaidExpensesAndOtherAssetsCurrentTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_CommonStockAndCommonStockWarrantsAbstract" abstract="true" name="CommonStockAndCommonStockWarrantsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_CommonStockAndCommonStockWarrantsTextBlock" abstract="false" name="CommonStockAndCommonStockWarrantsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_WarrantLiabilityPolicyPolicyTextBlock" abstract="false" name="WarrantLiabilityPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_PatentCostsPolicyPolicyTextBlock" abstract="false" name="PatentCostsPolicyPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_ScheduleOfPropertyPlantAndEquipmentUsefulLifeTableTextBlock" abstract="false" name="ScheduleOfPropertyPlantAndEquipmentUsefulLifeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="rmb_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" abstract="true" name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="rmb_LoanAndSecurityAgreementMember" abstract="true" name="LoanAndSecurityAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_AtTheMarketSalesAgreementMember" abstract="true" name="AtTheMarketSalesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" abstract="true" name="OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_DebtInstrumentAvailableProceedsFromSecuredDebtTriggeredByAchievementOfCertainMilestones" abstract="false" name="DebtInstrumentAvailableProceedsFromSecuredDebtTriggeredByAchievementOfCertainMilestones" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DebtInstrumentNumberOfTranches" abstract="false" name="DebtInstrumentNumberOfTranches" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="rmb_DebtInstrumentAvailableProceedsFromSecuredDebtTriggeredByLenderDiscretion" abstract="false" name="DebtInstrumentAvailableProceedsFromSecuredDebtTriggeredByLenderDiscretion" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_MajorCustomersMember" abstract="true" name="MajorCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerBMember" abstract="true" name="CustomerBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerCMember" abstract="true" name="CustomerCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerEMember" abstract="true" name="CustomerEMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerFMember" abstract="true" name="CustomerFMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerDMember" abstract="true" name="CustomerDMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerGMember" abstract="true" name="CustomerGMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_CustomerHMember" abstract="true" name="CustomerHMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_AccountingPoliciesTable" abstract="true" name="AccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="rmb_AccountingPoliciesLineItems" abstract="true" name="AccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_StandardProductWarrantyTerm" abstract="false" name="StandardProductWarrantyTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_AssuranceWarrantyTerm" abstract="false" name="AssuranceWarrantyTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_PaymentTerm" abstract="false" name="PaymentTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_ManufacturingAndLaboratoryEquipmentMember" abstract="true" name="ManufacturingAndLaboratoryEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_ComputerEquipmentAndSoftwareMember" abstract="true" name="ComputerEquipmentAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_ProductAndServiceMember" abstract="true" name="ProductAndServiceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_RecurringContractWithCustomerMember" abstract="true" name="RecurringContractWithCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_NonRecurringContractWithCustomerMember" abstract="true" name="NonRecurringContractWithCustomerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_AllOtherCountriesMember" abstract="true" name="AllOtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_WarrantLiabilityFairValueDisclosure" abstract="false" name="WarrantLiabilityFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_BorrowingTermsAxis" abstract="true" name="BorrowingTermsAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="rmb_BorrowingTermsDomain" abstract="true" name="BorrowingTermsDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_DebtInstrumentTrancheTwoMember" abstract="true" name="DebtInstrumentTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_DebtInstrumentTrancheThreeMember" abstract="true" name="DebtInstrumentTrancheThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_DebtInstrumentTrancheOneMember" abstract="true" name="DebtInstrumentTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_ClassOfWarrantOrRightPercentageOfProceedsFromIssuanceOfDebt" abstract="false" name="ClassOfWarrantOrRightPercentageOfProceedsFromIssuanceOfDebt" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="rmb_WarrantLiabilityMeasurementInput" abstract="false" name="WarrantLiabilityMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="rmb_WarrantLiabilityMember" abstract="true" name="WarrantLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_PrepaidFinancingFees" abstract="false" name="PrepaidFinancingFees" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_VendorAccrualsCurrent" abstract="false" name="VendorAccrualsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_UnamortizedDebtOnWarrantLiability" abstract="false" name="UnamortizedDebtOnWarrantLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DebtInstrumentCommitmentFeePercentage" abstract="false" name="DebtInstrumentCommitmentFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="rmb_ClassOfWarrantOrRightVolumeWeightedAveragePricePerSharePeriod" abstract="false" name="ClassOfWarrantOrRightVolumeWeightedAveragePricePerSharePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_DebtInstrumentTerminationFeesPercentageOfProceedsFromIssuanceOfDebt" abstract="false" name="DebtInstrumentTerminationFeesPercentageOfProceedsFromIssuanceOfDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="rmb_DebtInstrumentInterestRateInArrearsMonthlyPaymentPeriod" abstract="false" name="DebtInstrumentInterestRateInArrearsMonthlyPaymentPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_DebtInstrumentRepaymentPremiumPercent" abstract="false" name="DebtInstrumentRepaymentPremiumPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="rmb_LongTermDebtMaturityAfterYearFour" abstract="false" name="LongTermDebtMaturityAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_CowenAndCompanyLLCMember" abstract="true" name="CowenAndCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_NumberOfVotesPerCommonStockShareHeld" abstract="false" name="NumberOfVotesPerCommonStockShareHeld" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="rmb_SaleOfStockProspectusLimitationsMaximumConsiderationPermittedToBeReceivedOnTransaction" abstract="false" name="SaleOfStockProspectusLimitationsMaximumConsiderationPermittedToBeReceivedOnTransaction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_SaleOfStockCommissionPayablePercentageOfConsiderationReceivedOnTransaction" abstract="false" name="SaleOfStockCommissionPayablePercentageOfConsiderationReceivedOnTransaction" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="rmb_ClassOfWarrantOrRightExpirationsInPeriod" abstract="false" name="ClassOfWarrantOrRightExpirationsInPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="rmb_CommonStockWarrantMember" abstract="true" name="CommonStockWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_July242017Member" abstract="true" name="July242017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_April122018Member" abstract="true" name="April122018Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_July142021Member" abstract="true" name="July142021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_August82025Member" abstract="true" name="August82025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_A2010StockOptionAndGrantPlanMember" abstract="true" name="A2010StockOptionAndGrantPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_IncentiveAwardPlan2021Member" abstract="true" name="IncentiveAwardPlan2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_A2023InducementPlanMember" abstract="true" name="A2023InducementPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_EmployeeStockPurchasePlan2021Member" abstract="true" name="EmployeeStockPurchasePlan2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_EmployeesOfficersAndDirectorsMember" abstract="true" name="EmployeesOfficersAndDirectorsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuableUponExerciseOfStockOptionMaximum" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesIssuableUponExerciseOfStockOptionMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="rmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="rmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionAmount" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValueAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_DeferredTaxAssetsResearchAndDevelopmentCapitalizedCosts" abstract="false" name="DeferredTaxAssetsResearchAndDevelopmentCapitalizedCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DeferredTaxAssetsAccruedExpenses" abstract="false" name="DeferredTaxAssetsAccruedExpenses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DeferredTaxLiabilitiesDebtSecuritiesAvailableForSaleUnrealizedGain" abstract="false" name="DeferredTaxLiabilitiesDebtSecuritiesAvailableForSaleUnrealizedGain" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_DeferredTaxLiabilitiesDepreciation" abstract="false" name="DeferredTaxLiabilitiesDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_IncomeTaxDisclosureTable" abstract="true" name="IncomeTaxDisclosureTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="rmb_IncomeTaxDisclosureLineItems" abstract="true" name="IncomeTaxDisclosureLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_OperatingLossCarryforwardNotSubjectToExpiry" abstract="false" name="OperatingLossCarryforwardNotSubjectToExpiry" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_OperatingLossCarryforwardsExpectedExpirationAmount" abstract="false" name="OperatingLossCarryforwardsExpectedExpirationAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_TaxCreditsExpectedExpirationAmount" abstract="false" name="TaxCreditsExpectedExpirationAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_CommonStockWarrantsMember" abstract="true" name="CommonStockWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="rmb_LesseeFinanceLeaseNumberOfRenewalOptions" abstract="false" name="LesseeFinanceLeaseNumberOfRenewalOptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="rmb_OperatingLeaseRentalExpense" abstract="false" name="OperatingLeaseRentalExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_FinanceLeaseDepreciationAndInterestExpense" abstract="false" name="FinanceLeaseDepreciationAndInterestExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_CashFlowLesseeAbstract" abstract="true" name="CashFlowLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="rmb_FinanceLeaseInterestExpenseIncludingAdjustments" abstract="false" name="FinanceLeaseInterestExpenseIncludingAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="rmb_RobertSpignesiMember" abstract="true" name="RobertSpignesiMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
