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  <xs:element id="lung_NumberOfVotesForEachShareOfCommonStockHeld" abstract="false" name="NumberOfVotesForEachShareOfCommonStockHeld" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_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_OtherInternationalGeographicalAreasMember" abstract="true" name="OtherInternationalGeographicalAreasMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lung_GlendonFrenchMember" abstract="true" name="GlendonFrenchMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
