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  <xs:element id="lung_Over10ShareholderMember" abstract="true" name="Over10ShareholderMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_ShareBasedPaymentArrangementTrancheFourMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_CostOfGoodsAndServicesSoldMember" abstract="true" name="CostOfGoodsAndServicesSoldMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_TriggeringEventAxis" abstract="true" name="TriggeringEventAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lung_TriggeringEventDomain" abstract="true" name="TriggeringEventDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_RemainingVestingPeriodMember" abstract="true" name="RemainingVestingPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_NumberOfVotesForEachShareOfCommonStockHeld" abstract="false" name="NumberOfVotesForEachShareOfCommonStockHeld" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lung_CommonStockIncreaseInCapitalSharesReservedForFutureIssuance" abstract="false" name="CommonStockIncreaseInCapitalSharesReservedForFutureIssuance" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardTradingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardTradingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCostOfEquity" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsCostOfEquity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountOfSharesPerEmployee" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountOfSharesPerEmployee" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceAsPercentOfLowerFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceAsPercentOfLowerFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_ShareBasedCompensationEmployeeStockOutstandingMember" abstract="true" name="ShareBasedCompensationEmployeeStockOutstandingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_CommonStockRestrictedStockUnitsIssuedAndOutstandingMember" abstract="true" name="CommonStockRestrictedStockUnitsIssuedAndOutstandingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_ShareBasedCompensationEmployeeStockAvailableForGrantMember" abstract="true" name="ShareBasedCompensationEmployeeStockAvailableForGrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingOptionsAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingOptionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestWeightedAverageExercisePriceAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestWeightedAverageExercisePriceAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedTermAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lung_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageRemainingContractualTerm" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedOutstandingWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lung_PerformanceBasedAndMarketBasedRestrictedStockUnitsMember" abstract="true" name="PerformanceBasedAndMarketBasedRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_StockOptionsAndRSUsMember" abstract="true" name="StockOptionsAndRSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_OtherInternationalGeographicalAreasMember" abstract="true" name="OtherInternationalGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_TheCreditAgreementMember" abstract="true" name="TheCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_FirstTrancheMember" abstract="true" name="FirstTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_SecondTrancheMember" abstract="true" name="SecondTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_PerceptiveWarrantMember" abstract="true" name="PerceptiveWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_LongTermDebtInstrumentNumberOfDraws" abstract="false" name="LongTermDebtInstrumentNumberOfDraws" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="lung_DebtInstrumentCovenantRevenueRequirement" abstract="false" name="DebtInstrumentCovenantRevenueRequirement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lung_DebtInstrumentApplicableMarginRate" abstract="false" name="DebtInstrumentApplicableMarginRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_DebtInstrumentIncreaseDecreaseInMarginRate" abstract="false" name="DebtInstrumentIncreaseDecreaseInMarginRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_DebtInstrumentPrepaymentPremium" abstract="false" name="DebtInstrumentPrepaymentPremium" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_DentInstrumentUpfrontFee" abstract="false" name="DentInstrumentUpfrontFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lung_DebtInstrumentExitFeePercentage" abstract="false" name="DebtInstrumentExitFeePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_DebtInstrumentCovenantLiquidityAmountMinimum" abstract="false" name="DebtInstrumentCovenantLiquidityAmountMinimum" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lung_DebtInstrumentPremiumPricePercentage" abstract="false" name="DebtInstrumentPremiumPricePercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lung_DebtInstrumentNumberOfDaysVolumeWeightedAveragePriceOnSpecificDate" abstract="false" name="DebtInstrumentNumberOfDaysVolumeWeightedAveragePriceOnSpecificDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
</xs:schema>
