<?xml version="1.0" encoding="UTF-8" ?>
<schema targetNamespace="http://www.surgicountmedical.com/20120930" elementFormDefault="qualified"
xmlns:pstx="http://www.surgicountmedical.com/20120930"
 xmlns="http://www.w3.org/2001/XMLSchema"
 xmlns:link="http://www.xbrl.org/2003/linkbase"
 xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
 xmlns:xl="http://www.xbrl.org/2003/XLink"
 xmlns:xbrli="http://www.xbrl.org/2003/instance"
 xmlns:xlink="http://www.w3.org/1999/xlink"
 xmlns:negated="http://www.xbrl.org/2009/role/negated"
 xmlns:us-gaap="http://fasb.org/us-gaap/2012-01-31"
 xmlns:country="http://xbrl.sec.gov/country/2012-01-31"
 xmlns:currency="http://xbrl.sec.gov/currency/2012-01-31"
 xmlns:dei="http://xbrl.sec.gov/dei/2012-01-31"
 xmlns:exch="http://xbrl.sec.gov/exch/2012-01-31"
 xmlns:invest="http://xbrl.sec.gov/invest/2012-01-31"
 xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31"
 xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31"
 xmlns:us-types="http://fasb.org/us-types/2012-01-31"
 xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31"
 xmlns:deprecated="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact"
 xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
 xmlns:num="http://www.xbrl.org/dtr/type/numeric"
>
<annotation><appinfo>
<link:roleType roleURI="http://www.surgicountmedical.com/role/DocumentDocumentandEntityInformation" id="DocumentDocumentandEntityInformation">
<link:definition>001 - Document - Document and Entity Information</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/CondensedConsolidatedBalanceSheets" id="CondensedConsolidatedBalanceSheets">
<link:definition>002 - Statement - Condensed Consolidated Balance Sheets</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/CondensedConsolidatedBalanceSheetsParenthetical" id="CondensedConsolidatedBalanceSheetsParenthetical">
<link:definition>003 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/CondensedConsolidatedStatementsOfOperations" id="CondensedConsolidatedStatementsOfOperations">
<link:definition>004 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/CondensedConsolidatedStatementsOfCashFlows" id="CondensedConsolidatedStatementsOfCashFlows">
<link:definition>005 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/DescriptionOfBusiness" id="DescriptionOfBusiness">
<link:definition>006 - Disclosure - Description of Business</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies" id="BasisOfPresentationAndSummaryOfSignificantAccountingPolicies">
<link:definition>007 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/LossPerCommonShare" id="LossPerCommonShare">
<link:definition>008 - Disclosure - Loss Per Common Share</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/InventoriesNet" id="InventoriesNet">
<link:definition>009 - Disclosure - Inventories Net</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/PropertyAndEquipmentNet" id="PropertyAndEquipmentNet">
<link:definition>010 - Disclosure - Property and Equipment, Net</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/DeferredRevenue" id="DeferredRevenue">
<link:definition>011 - Disclosure - Deferred Revenue</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockholderSEquity" id="StockholderSEquity">
<link:definition>012 - Disclosure - Stockholder's Equity</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/Warrants" id="Warrants">
<link:definition>013 - Disclosure - Warrants</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockOptionPlans" id="StockOptionPlans">
<link:definition>014 - Disclosure - Stock Option Plans</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/RelatedPartyTransactions" id="RelatedPartyTransactions">
<link:definition>015 - Disclosure - Related Party Transactions</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/MajorCustomersSuppliersSegmentAndRelatedInformation" id="MajorCustomersSuppliersSegmentAndRelatedInformation">
<link:definition>016 - Disclosure - Major Customers, Suppliers, Segment and Related Information</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/CommitmentsAndContingencies" id="CommitmentsAndContingencies">
<link:definition>017 - Disclosure - Commitments and Contingencies</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/SubsequentEvents" id="SubsequentEvents">
<link:definition>018 - Disclosure - Subsequent Events</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" id="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies">
<link:definition>019 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/InventoriesNetTables" id="InventoriesNetTables">
<link:definition>020 - Disclosure - Inventories Net (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/PropertyAndEquipmentNetTables" id="PropertyAndEquipmentNetTables">
<link:definition>021 - Disclosure - Property and Equipment, Net (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/WarrantsTables" id="WarrantsTables">
<link:definition>022 - Disclosure - Warrants (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockOptionPlansTables" id="StockOptionPlansTables">
<link:definition>023 - Disclosure - Stock Option Plans (Tables)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails" id="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetails">
<link:definition>024 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/LossPerCommonShareDetails" id="LossPerCommonShareDetails">
<link:definition>025 - Disclosure - Loss Per Common Share (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/InventoriesNetDetails" id="InventoriesNetDetails">
<link:definition>026 - Disclosure - Inventories Net (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/PropertyAndEquipmentNetDetails" id="PropertyAndEquipmentNetDetails">
<link:definition>027 - Disclosure - Property and Equipment, Net (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/PropertyandEquipmentNetDetailsTextual" id="PropertyandEquipmentNetDetailsTextual">
<link:definition>028 - Disclosure - Property and Equipment, Net (Details Textual)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/DeferredRevenueDetails" id="DeferredRevenueDetails">
<link:definition>029 - Disclosure - Deferred Revenue (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockholdersEquityDetails" id="StockholdersEquityDetails">
<link:definition>030 - Disclosure - Stockholder's Equity (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/WarrantsDetails" id="WarrantsDetails">
<link:definition>031 - Disclosure - Warrants (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/WarrantsDetails1" id="WarrantsDetails1">
<link:definition>032 - Disclosure - Warrants (Details 1)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockOptionPlansDetails" id="StockOptionPlansDetails">
<link:definition>033 - Disclosure - Stock Option Plans (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockOptionPlansDetails1" id="StockOptionPlansDetails1">
<link:definition>034 - Disclosure - Stock Option Plans (Details 1)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/StockOptionPlansDetailsTextual" id="StockOptionPlansDetailsTextual">
<link:definition>035 - Disclosure - Stock Option Plans (Details Textual)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/RelatedPartyTransactionsDetails" id="RelatedPartyTransactionsDetails">
<link:definition>036 - Disclosure - Related Party Transactions (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:roleType roleURI="http://www.surgicountmedical.com/role/MajorCustomersSuppliersSegmentAndRelatedInformationDetails" id="MajorCustomersSuppliersSegmentAndRelatedInformationDetails">
<link:definition>037 - Disclosure - Major Customers, Suppliers, Segment and Related Information (Details)</link:definition>
<link:usedOn>link:presentationLink</link:usedOn>
<link:usedOn>link:definitionLink</link:usedOn>
<link:usedOn>link:calculationLink</link:usedOn>
</link:roleType>
<link:linkbaseRef xlink:type="simple" xlink:href="pstx-20120930_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="pstx-20120930_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="pstx-20120930_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
<link:linkbaseRef xlink:type="simple" xlink:href="pstx-20120930_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/>
</appinfo></annotation>
<import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
<import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
<import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
<import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/currency/2012-01-31" schemaLocation="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/exch/2012-01-31" schemaLocation="http://xbrl.sec.gov/exch/2012/exch-2012-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/>
<import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/>
<import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/>
<import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd"/>
<import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd"/>
<import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd"/>
<import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
<import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
<import namespace="http://fasb.org/us-types/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-types-2012-01-31.xsd"/>
<element name="DocumentAndEntityInformationAbstract" id="pstx_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="PreferredStockCumulativeDividendRatePerAnnum" id="pstx_PreferredStockCumulativeDividendRatePerAnnum" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="TransferFromRestrictedCashInConnectionWithTaxEscrowAccount" id="pstx_TransferFromRestrictedCashInConnectionWithTaxEscrowAccount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="IssuanceOfCommonSharesPreviouslyEarned" id="pstx_IssuanceOfCommonSharesPreviouslyEarned" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ScheduleOfShareBasedCompensationOtherThanStockOptionsActivityTableTextBlock" id="pstx_ScheduleOfShareBasedCompensationOtherThanStockOptionsActivityTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockPurchaseWarrantsExpireTableTextBlock" id="pstx_StockPurchaseWarrantsExpireTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTextualAbstract" id="pstx_BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpectedTermOfCustomerContracts" id="pstx_ExpectedTermOfCustomerContracts" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="LossPerCommonShareTextualAbstract" id="pstx_LossPerCommonShareTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NumberOfSharesAssociatedWithConvertiblePreferredStockPlusWarrantsAndOptions" id="pstx_NumberOfSharesAssociatedWithConvertiblePreferredStockPlusWarrantsAndOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="InventoriesTable" id="pstx_InventoriesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" />
<element name="InventoriesAxis" id="pstx_InventoriesAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" />
<element name="InventoriesDomain" id="pstx_InventoriesDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SurgicalSpongesAndTowelsMember" id="pstx_SurgicalSpongesAndTowelsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ScannersAndRelatedHardwareMember" id="pstx_ScannersAndRelatedHardwareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="InventoriesLineItems" id="pstx_InventoriesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="HardwareForCustomerUseGross" id="pstx_HardwareForCustomerUseGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="PropertyAndEquipmentNetTextualAbstract" id="pstx_PropertyAndEquipmentNetTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="DepreciationCostAssociatedWithHardware" id="pstx_DepreciationCostAssociatedWithHardware" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="DeferredRevenueTextualAbstract" id="pstx_DeferredRevenueTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockholderEquityTextualAbstract" id="pstx_StockholderEquityTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="PurchasePriceOfEachCommonStock" id="pstx_PurchasePriceOfEachCommonStock" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="IssuanceCostOfCommonStock" id="pstx_IssuanceCostOfCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="RegistrationRightsAgreement" id="pstx_RegistrationRightsAgreement" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="WarrantsToPurchaseCommonStockActivityAbstract" id="pstx_WarrantsToPurchaseCommonStockActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpirationPeriodAxis" id="pstx_ExpirationPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" />
<element name="ExpirationPeriodDomain" id="pstx_ExpirationPeriodDomain" type="nonnum:domainItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpirationForNextTweleveMonthMember" id="pstx_ExpirationForNextTweleveMonthMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpirationForYearOneMember" id="pstx_ExpirationForYearOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpirationForYearTwoMember" id="pstx_ExpirationForYearTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ExpirationForYearThreeMember" id="pstx_ExpirationForYearThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockPurchaseWarrantsAbstract" id="pstx_StockPurchaseWarrantsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="FairValueAssumptionOfStockOptionAbstract" id="pstx_FairValueAssumptionOfStockOptionAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEstimatedForfeitureRate" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsEstimatedForfeitureRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionUnvestedAndExpectedToVestOutstandingNumber" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionUnvestedAndExpectedToVestOutstandingNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedAndExpectedToVestWeightedAverageExercisePrice" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedAndExpectedToVestWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageRemainingContractualTerms" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedWeightedAverageRemainingContractualTerms" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionUnvestedAndExpectedToVestWeightedAverageRemainingContractualTerm" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionUnvestedAndExpectedToVestWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedIntrinsicValue" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedAndExpectedToVestAggregateIntrinsicValue" id="pstx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedAndExpectedToVestAggregateIntrinsicValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockOptionPlansTextualAbstract" id="pstx_StockOptionPlansTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NonQualifedOptions" id="pstx_NonQualifedOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="IncentiveStockOptions" id="pstx_IncentiveStockOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" />
<element name="GrantDateFairValueOfStockOptionsGranted" id="pstx_GrantDateFairValueOfStockOptionsGranted" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockIssuableBeforeAmendmentEmployeeStockPurchasePlan" id="pstx_StockIssuableBeforeAmendmentEmployeeStockPurchasePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="StockIssuableAfterAmendmentEmployeeStockPurchasePlan" id="pstx_StockIssuableAfterAmendmentEmployeeStockPurchasePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RelatedPartyTransactionsTextualAbstract" id="pstx_RelatedPartyTransactionsTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="SurgicalProductsPurchased" id="pstx_SurgicalProductsPurchased" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" />
<element name="MajorCustomersSuppliersSegmentAndRelatedInformationTextualAbstract" id="pstx_MajorCustomersSuppliersSegmentAndRelatedInformationTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="NumberOfCustomerForDistributionAgreement" id="pstx_NumberOfCustomerForDistributionAgreement" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="RevenueExcessPercentage" id="pstx_RevenueExcessPercentage" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="PercentageOfAccountsReceivablesRelatedToMajorCustomer" id="pstx_PercentageOfAccountsReceivablesRelatedToMajorCustomer" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="AccountsReceivablesPercentageRelatedToSurgicalSpongeAndTowel" id="pstx_AccountsReceivablesPercentageRelatedToSurgicalSpongeAndTowel" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
<element name="AccountsReceivablesPercentageRelatedToReimbursementsForHardwareCosts" id="pstx_AccountsReceivablesPercentageRelatedToReimbursementsForHardwareCosts" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" />
</schema>
