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  <xsd:element id="isrg_MinimumExercisePriceOfNsosPercentageOfFairValue" name="MinimumExercisePriceOfNsosPercentageOfFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_MinimumHoursEmployedPerWeekToParticipateInEmployeeStockPurchasePlan" name="MinimumHoursEmployedPerWeekToParticipateInEmployeeStockPurchasePlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_MinimumMonthsEmployedPerYearToParticipateInEmployeeStockPurchasePlan" name="MinimumMonthsEmployedPerYearToParticipateInEmployeeStockPurchasePlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_MunicipalSecuritiesMember" name="MunicipalSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_NewHireOptionsMember" name="NewHireOptionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_NonvestedStockOptionMember" name="NonvestedStockOptionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_NumberOfMajorCustomersRepresentingTotalRevenue" name="NumberOfMajorCustomersRepresentingTotalRevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_NumberofSurgeriesPerformedwithdaVinciSurgicalSysteminUnitedStates" name="NumberofSurgeriesPerformedwithdaVinciSurgicalSysteminUnitedStates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_OfferingPeriodEmployeeStockPurchasePlans" name="OfferingPeriodEmployeeStockPurchasePlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_OfferingPeriodNumberofPurchasePeriodsOfferingDividedIntoEmployeeStockPurchasePlans" name="OfferingPeriodNumberofPurchasePeriodsOfferingDividedIntoEmployeeStockPurchasePlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_OfferingPeriodPeriodOfferingDividedIntoEmployeeStockPurchasePlans" name="OfferingPeriodPeriodOfferingDividedIntoEmployeeStockPurchasePlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_OperatingLeaseMaximumTerm" name="OperatingLeaseMaximumTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_PaymentAmountDividedByClosingPricePercent" name="PaymentAmountDividedByClosingPricePercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_PeriodofLookBackThatCouldCauseOfferingPeriodtoResetEmployeeStockPurchasePlans" name="PeriodofLookBackThatCouldCauseOfferingPeriodtoResetEmployeeStockPurchasePlans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_PurchasedSoftwareMember" name="PurchasedSoftwareMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_RangeFiveMember" name="RangeFiveMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_RangeFourMember" name="RangeFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_RangeOneMember" name="RangeOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_RangeThreeMember" name="RangeThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_RangeTwoMember" name="RangeTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_ResearchAndDevelopmentMember" name="ResearchAndDevelopmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesAxis" name="ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesDomain" name="ScheduleOfAvailableForSaleAndHeldToMaturitySecuritiesDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_ScheduleofCommonStockRepurchasedTableTextBlock" name="ScheduleofCommonStockRepurchasedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_SellingGeneralAndAdministrativeMember" name="SellingGeneralAndAdministrativeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageExercisePriceAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_ShareBasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsMarketbasedImpliedVolatilityPercent" name="ShareBasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsMarketbasedImpliedVolatilityPercent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_ShareBasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsMarketbasedImpliedVolatilityPeriod" name="ShareBasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsMarketbasedImpliedVolatilityPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingPerMonthAfterOneYear" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingPerMonthAfterOneYear" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingPerMonthAfterSixMonthsofService" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingPerMonthAfterSixMonthsofService" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingUponOneYearofService" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingUponOneYearofService" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingUponSixMonthsofService" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingUponSixMonthsofService" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingattheEndofOneMonth" name="SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingRightsPercentageVestingattheEndofOneMonth" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestNumber" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedtoVestNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="isrg_StockOptionsGrantedInitialVestingPeriod" name="StockOptionsGrantedInitialVestingPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_StockRepurchaseProgramincreasedtoauthorizedamount" name="StockRepurchaseProgramincreasedtoauthorizedamount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="isrg_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SupplementBalanceSheetDisclosuresandCashFlowSupplementalDisclosuresTextBlock" name="SupplementBalanceSheetDisclosuresandCashFlowSupplementalDisclosuresTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SystemSalesArrangementAdditionalPeriodofService" name="SystemSalesArrangementAdditionalPeriodofService" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_SystemSalesArrangementFreePeriodofService" name="SystemSalesArrangementFreePeriodofService" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_TotalRevenueMember" name="TotalRevenueMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="isrg_TransferfromInventory" name="TransferfromInventory" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_TwoThousandEquityIncentivePlanMember" name="TwoThousandEquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_TwoThousandNonEmployeeDirectorsStockOptionPlanMember" name="TwoThousandNonEmployeeDirectorsStockOptionPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_UnitedStatesCorporateDebtAndEquitySecuritiesMember" name="UnitedStatesCorporateDebtAndEquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="isrg_UnitedStatesMember" name="UnitedStatesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
