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  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/ecd-sub/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-sub-2025.xsd" />
  <xsd:element name="DividendsDisclosureAbstract" id="rvp_DividendsDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionMaximumPercentageOfDistributorsTotalPurchaseInPriorTwelveMonthPeriodForOverstockReturn" id="rvp_RevenueRecognitionMaximumPercentageOfDistributorsTotalPurchaseInPriorTwelveMonthPeriodForOverstockReturn" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionOverstockReturnLimitNumber" id="rvp_RevenueRecognitionOverstockReturnLimitNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionOverstockReturnPeriod" id="rvp_RevenueRecognitionOverstockReturnPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RevenueRecognitionPeriodForReturnOfIncorrectShipments" id="rvp_RevenueRecognitionPeriodForReturnOfIncorrectShipments" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeriesThreeConvertibleClassBPreferredStockMember" id="rvp_SeriesThreeConvertibleClassBPreferredStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeriesTwoConvertibleClassBPreferredStockMember" id="rvp_SeriesTwoConvertibleClassBPreferredStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfSignificantCustomers" id="rvp_NumberOfSignificantCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DividendsDisclosureTextBlock" id="rvp_DividendsDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UsefulLifeOfPropertyPlantAndEquipmentTableTextBlock" id="rvp_UsefulLifeOfPropertyPlantAndEquipmentTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SyringesMember" id="rvp_SyringesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BloodCollectionProductsMember" id="rvp_BloodCollectionProductsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EasyPointNeedlesMember" id="rvp_EasyPointNeedlesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherProductsMember" id="rvp_OtherProductsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SelfInsuredEmployeeBenefitCostsPolicyTextBlock" id="rvp_SelfInsuredEmployeeBenefitCostsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInOtherOperatingAssetsExcludingOtherCurrentAssets" id="rvp_IncreaseDecreaseInOtherOperatingAssetsExcludingOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="InterestAndOtherIncomeLoss" id="rvp_InterestAndOtherIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="TechnologyInvestmentAgreementDisclosureAbstract" id="rvp_TechnologyInvestmentAgreementDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TechnologyInvestmentAgreementDisclosureTextBlock" id="rvp_TechnologyInvestmentAgreementDisclosureTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TechnologyInvestmentAgreementTerm" id="rvp_TechnologyInvestmentAgreementTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TechnologyInvestmentAgreementPolicyTextBlock" id="rvp_TechnologyInvestmentAgreementPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermDeferredLiabilityTechnologyInvestmentAgreement" id="rvp_LongTermDeferredLiabilityTechnologyInvestmentAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CurrentPortionOfPreferredStockRepurchase" id="rvp_CurrentPortionOfPreferredStockRepurchase" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CumulativeAnnualPayments" id="rvp_CumulativeAnnualPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfEntitledShareholders" id="rvp_NumberOfEntitledShareholders" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContingentLiabilityFormerShareholders" id="rvp_ContingentLiabilityFormerShareholders" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfProductsConsignedToCustomer" id="rvp_NumberOfProductsConsignedToCustomer" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherIncomeTechnologyAgreement" id="rvp_OtherIncomeTechnologyAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="LicenseRevenuePercentagePayableToPatentOwner" id="rvp_LicenseRevenuePercentagePayableToPatentOwner" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfAssemblyLines" id="rvp_NumberOfAssemblyLines" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TechnologyInvestmentAgreementMember" id="rvp_TechnologyInvestmentAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtSecuritiesTradingAndEquitySecuritiesAccumulatedGrossUnrealizedGain" id="rvp_DebtSecuritiesTradingAndEquitySecuritiesAccumulatedGrossUnrealizedGain" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="SignificantCustomersMember" id="rvp_SignificantCustomersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CostOfSalesShippingAndHandlingPolicyPolicyTextBlock" id="rvp_CostOfSalesShippingAndHandlingPolicyPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="HealthInsuranceBenefitsSelfInsuranceThresholdMinimumForIndividualClaims" id="rvp_HealthInsuranceBenefitsSelfInsuranceThresholdMinimumForIndividualClaims" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="HealthInsuranceBenefitsSelfInsuranceThresholdForTotalPlanClaims" id="rvp_HealthInsuranceBenefitsSelfInsuranceThresholdForTotalPlanClaims" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationReturnToProvisionAndOtherAdjustmentsPercent" id="rvp_EffectiveIncomeTaxRateReconciliationReturnToProvisionAndOtherAdjustmentsPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SeriesTwoThreeFourAndFiveConvertibleClassBPreferredStockMember" id="rvp_SeriesTwoThreeFourAndFiveConvertibleClassBPreferredStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="DebtSecuritiesTradingAndEquitySecuritiesFvNiCurrent" id="rvp_DebtSecuritiesTradingAndEquitySecuritiesFvNiCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ThomasJShawMember" id="rvp_ThomasJShawMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PreferredDividendsDeclaredNotPaidInNoncashInvestingAndFinancingActivities" id="rvp_PreferredDividendsDeclaredNotPaidInNoncashInvestingAndFinancingActivities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="EffectiveIncomeTaxRateReconciliationLimitOnCompensationPercent" id="rvp_EffectiveIncomeTaxRateReconciliationLimitOnCompensationPercent" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NorthAndSouthAmericaSalesExcludingUnitedStatesSalesMember" id="rvp_NorthAndSouthAmericaSalesExcludingUnitedStatesSalesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="OtherInternationalSalesMember" id="rvp_OtherInternationalSalesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="UnitedStatesSalesMember" id="rvp_UnitedStatesSalesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TariffsPercentageOfImportValue" id="rvp_TariffsPercentageOfImportValue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="SyringesAndNeedlesMember" id="rvp_SyringesAndNeedlesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SingleReportableSegmentMember" id="rvp_SingleReportableSegmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="FinanceLeaseRightOfUseAssetsAndLeaseLiabilitiesTableTextBlock" id="rvp_FinanceLeaseRightOfUseAssetsAndLeaseLiabilitiesTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="TariffRefundOverpaymentsReceived" id="rvp_TariffRefundOverpaymentsReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="TariffRefundCorrectionOfIncorrectCharges" id="rvp_TariffRefundCorrectionOfIncorrectCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="TariffOverpaymentsRefundIncludingInterest" id="rvp_TariffOverpaymentsRefundIncludingInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="AdValoremDutyPercentage" id="rvp_AdValoremDutyPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
