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  <xs:element id="prct_DebtInstrumentCovenantComplianceRevenueForecastAmountAllInstallmentsDrawn" abstract="false" name="DebtInstrumentCovenantComplianceRevenueForecastAmountAllInstallmentsDrawn" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="prct_OutsideTheUnitedStatesMember" abstract="true" name="OutsideTheUnitedStatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="prct_LoanFacilityMember" abstract="true" name="LoanFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="prct_NonCashLeaseAccretionExpense" abstract="false" name="NonCashLeaseAccretionExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="prct_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="prct_OperatingLeaseAnnualBaseRentYearOne" abstract="false" name="OperatingLeaseAnnualBaseRentYearOne" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="prct_ProductWarrantyTerm" abstract="false" name="ProductWarrantyTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="prct_LineOfCreditFacilityEarlyRepaymentFeeSecondTwelveMonthPeriodPercent" abstract="false" name="LineOfCreditFacilityEarlyRepaymentFeeSecondTwelveMonthPeriodPercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="prct_LoanFacilityTrancheOneMember" abstract="true" name="LoanFacilityTrancheOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="prct_PaymentForDebtExtinguishmentOrDebtPrepaymentCostFinalPaymentFee" abstract="false" name="PaymentForDebtExtinguishmentOrDebtPrepaymentCostFinalPaymentFee" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="prct_DebtInstrumentCovenantComplianceInterestOnlyPeriodRenewalTerm" abstract="false" name="DebtInstrumentCovenantComplianceInterestOnlyPeriodRenewalTerm" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="prct_ServiceAgreementAmortizationPeriod" abstract="false" name="ServiceAgreementAmortizationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="prct_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardCliffVestingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardCliffVestingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
