<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Toppan Merrill Bridge  9.6.8167.22744 -->
<!--Based on XBRL 2.1-->
<!--Created on: 8/15/2022 8:06:39 PM-->
<!--Modified on: 8/15/2022 8:06:39 PM-->
<xsd:schema targetNamespace="http://www.heliusmedical.com/20220630" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:hsdt="http://www.heliusmedical.com/20220630" xmlns:deprecated="http://www.xbrl.org/2009/role/deprecated" xmlns:us-roles="http://fasb.org/us-roles/2021-01-31" xmlns:currency="http://xbrl.sec.gov/currency/2021" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-types="http://fasb.org/us-types/2021-01-31" xmlns:srt-roles="http://fasb.org/srt-roles/2021-01-31" xmlns:utr="http://www.xbrl.org/2009/utr" xmlns:us-gaap="http://fasb.org/us-gaap/2021-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:sic="http://xbrl.sec.gov/sic/2021" xmlns:stpr="http://xbrl.sec.gov/stpr/2021" xmlns:srt-types="http://fasb.org/srt-types/2021-01-31" xmlns:enum2="http://xbrl.org/2020/extensible-enumerations-2.0" xmlns:country="http://xbrl.sec.gov/country/2021" xmlns:net="http://www.xbrl.org/2009/role/net" xmlns:naics="http://xbrl.sec.gov/naics/2021" xmlns:dei="http://xbrl.sec.gov/dei/2021q4" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:exch="http://xbrl.sec.gov/exch/2021" xmlns:attributeFormDefault="unqualified" xmlns:srt="http://fasb.org/srt/2021-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <xsd:annotation>
    <xsd:appinfo>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/StatementUnauditedCondensedConsolidatedBalanceSheets" id="StatementUnauditedCondensedConsolidatedBalanceSheets">
        <link:definition>00100 - Statement - Unaudited Condensed Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/StatementUnauditedCondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss" id="StatementUnauditedCondensedConsolidatedStatementsOfOperationsAndComprehensiveLoss">
        <link:definition>00200 - Statement - Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/StatementUnauditedCondensedConsolidatedStatementsOfCashFlows" id="StatementUnauditedCondensedConsolidatedStatementsOfCashFlows">
        <link:definition>00400 - Statement - Unaudited Condensed Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureLeasesDetails" id="DisclosureLeasesDetails">
        <link:definition>40601 - Disclosure - Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfFutureMinimumLeasePaymentsRelatedToNonCancellableOperatingLeaseCommitmentsDetails2" id="DisclosureCommitmentsAndContingenciesScheduleOfFutureMinimumLeasePaymentsRelatedToNonCancellableOperatingLeaseCommitmentsDetails2">
        <link:definition>51003805 - Disclosure - Commitments and Contingencies - Schedule of Future Minimum Lease Payments Related to Non-cancellable Operating Lease Commitments (Details)2</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/StatementUnauditedCondensedConsolidatedStatementsOfStockholdersEquity" id="StatementUnauditedCondensedConsolidatedStatementsOfStockholdersEquity">
        <link:definition>00300 - Statement - Unaudited Condensed Consolidated Statements of Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockBasedCompensationTables" id="DisclosureStockBasedCompensationTables">
        <link:definition>30803 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureRisksAndUncertaintiesAdditionalInformationDetails" id="DisclosureRisksAndUncertaintiesAdditionalInformationDetails">
        <link:definition>40201 - Disclosure - Risks and Uncertainties - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureRevenueFromContractsWithCustomersDetails" id="DisclosureRevenueFromContractsWithCustomersDetails">
        <link:definition>40401 - Disclosure - Revenue from Contracts with Customers (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockholdersEquityAdditionalInformationDetails" id="DisclosureStockholdersEquityAdditionalInformationDetails">
        <link:definition>40701 - Disclosure - Stockholders' Equity - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails" id="DisclosureStockBasedCompensationAdditionalInformationDetails">
        <link:definition>40801 - Disclosure - Stock-Based Compensation - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockBasedCompensationFairValueAssumptionsDetails" id="DisclosureStockBasedCompensationFairValueAssumptionsDetails">
        <link:definition>40802 - Disclosure - Stock-Based Compensation - Fair Value Assumptions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockBasedCompensationStockBasedCompensationExpenseDetails" id="DisclosureStockBasedCompensationStockBasedCompensationExpenseDetails">
        <link:definition>40803 - Disclosure - Stock-Based Compensation - Stock-Based Compensation Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetails" id="DisclosureCommitmentsAndContingenciesAdditionalInformationDetails">
        <link:definition>41001 - Disclosure - Commitments and Contingencies - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSubsequentEventsDetails" id="DisclosureSubsequentEventsDetails">
        <link:definition>41101 - Disclosure - Subsequent Events (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DocumentDocumentAndEntityInformation" id="DocumentDocumentAndEntityInformation">
        <link:definition>00090 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/StatementUnauditedCondensedConsolidatedBalanceSheetsParenthetical" id="StatementUnauditedCondensedConsolidatedBalanceSheetsParenthetical">
        <link:definition>00105 - Statement - Unaudited Condensed Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureOrganizationConsolidationAndPresentationOfFinancialStatements" id="DisclosureOrganizationConsolidationAndPresentationOfFinancialStatements">
        <link:definition>10101 - Disclosure - Organization, Consolidation and Presentation of Financial Statements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureRisksAndUncertainties" id="DisclosureRisksAndUncertainties">
        <link:definition>10201 - Disclosure - Risks and Uncertainties</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureRecentAccountingPronouncements" id="DisclosureRecentAccountingPronouncements">
        <link:definition>10301 - Disclosure - Recent Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureRevenueFromContractsWithCustomers" id="DisclosureRevenueFromContractsWithCustomers">
        <link:definition>10401 - Disclosure - Revenue from Contracts with Customers</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosures" id="DisclosureSupplementalBalanceSheetDisclosures">
        <link:definition>10501 - Disclosure - Supplemental Balance Sheet Disclosures</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureLeases" id="DisclosureLeases">
        <link:definition>10601 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockholdersEquity" id="DisclosureStockholdersEquity">
        <link:definition>10701 - Disclosure - Stockholders' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureStockBasedCompensation" id="DisclosureStockBasedCompensation">
        <link:definition>10801 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureBasicAndDilutedLossPerShare" id="DisclosureBasicAndDilutedLossPerShare">
        <link:definition>10901 - Disclosure - Basic and Diluted Loss per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/20220331/taxonomy/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>11001 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>11101 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosuresTables" id="DisclosureSupplementalBalanceSheetDisclosuresTables">
        <link:definition>30503 - Disclosure - Supplemental Balance Sheet Disclosures (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureLeasesTables" id="DisclosureLeasesTables">
        <link:definition>30603 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureBasicAndDilutedLossPerShareTables" id="DisclosureBasicAndDilutedLossPerShareTables">
        <link:definition>30903 - Disclosure - Basic and Diluted Loss per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosuresAccountsReceivableNetDetails" id="DisclosureSupplementalBalanceSheetDisclosuresAccountsReceivableNetDetails">
        <link:definition>40501 - Disclosure - Supplemental Balance Sheet Disclosures - Accounts receivable, net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosuresInventoryDetails" id="DisclosureSupplementalBalanceSheetDisclosuresInventoryDetails">
        <link:definition>40502 - Disclosure - Supplemental Balance Sheet Disclosures - Inventory (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosuresAccruedExpensesDetails" id="DisclosureSupplementalBalanceSheetDisclosuresAccruedExpensesDetails">
        <link:definition>40503 - Disclosure - Supplemental Balance Sheet Disclosures - Accrued Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureSupplementalBalanceSheetDisclosuresDeferredRevenueDetails" id="DisclosureSupplementalBalanceSheetDisclosuresDeferredRevenueDetails">
        <link:definition>40504 - Disclosure - Supplemental Balance Sheet Disclosures - Deferred Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureBasicAndDilutedLossPerShareDetails" id="DisclosureBasicAndDilutedLossPerShareDetails">
        <link:definition>40901 - Disclosure - Basic and Diluted Loss per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20220630_pre.xml" xlink:title="Presentation Links, all" 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="tmb-20220630_cal.xml" xlink:title="Calculation Links, all" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="tmb-20220630_def.xml" xlink:title="Definition Links, all" 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="tmb-20220630_lab.xml" xlink:title="Label Links, all" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://www.heliusmedical.com/role/DisclosureStandardAndCustomAxisDomainDefaults" id="DisclosureStandardAndCustomAxisDomainDefaults">
        <link:definition>99900 - Disclosure - Standard And Custom Axis Domain Defaults</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://xbrl.sec.gov/country/2021" schemaLocation="https://xbrl.sec.gov/country/2021/country-2021.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2021q4" schemaLocation="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://fasb.org/srt/2021-01-31" schemaLocation="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2021-01-31" schemaLocation="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2021-01-31" schemaLocation="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd" />
  <xsd:element name="ForeignCurrencyTransactionIncludingOtherGainLossBeforeTax" id="hsdt_ForeignCurrencyTransactionIncludingOtherGainLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesWarrantExercised" id="hsdt_StockIssuedDuringPeriodSharesWarrantExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueWarrantExercised" id="hsdt_StockIssuedDuringPeriodValueWarrantExercised" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromExerciseOfWarrantsAndStockOptions" id="hsdt_ProceedsFromExerciseOfWarrantsAndStockOptions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="LesseeOperatingLeaseInformationIncludingMaturityTableTextBlock" id="hsdt_LesseeOperatingLeaseInformationIncludingMaturityTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDevicesResultedInRecognitionOfRevenue" id="hsdt_NumberOfDevicesResultedInRecognitionOfRevenue" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfStockholdersEquityLineItems" id="hsdt_ScheduleOfStockholdersEquityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfStockholdersEquityTable" id="hsdt_ScheduleOfStockholdersEquityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LincolnParkPurchaseAgreementMember" id="hsdt_LincolnParkPurchaseAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightExercised" id="hsdt_ClassOfWarrantOrRightExercised" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantsOrRightExpirationPeriod" id="hsdt_ClassOfWarrantsOrRightExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromIssuanceOfCommonStockNet" id="hsdt_ProceedsFromIssuanceOfCommonStockNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TwoThousandTwentyOneInducementPlanMember" id="hsdt_TwoThousandTwentyOneInducementPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccruedFranchiseFeeCurrent" id="hsdt_AccruedFranchiseFeeCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PercentageOfRoyaltyOnNetRevenue" id="hsdt_PercentageOfRoyaltyOnNetRevenue" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsAndContingenciesLineItems" id="hsdt_CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommitmentsAndContingenciesTable" id="hsdt_CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClassOfWarrantOrRightExpired" id="hsdt_ClassOfWarrantOrRightExpired" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SupplementalBalanceSheetDisclosuresAbstract" id="hsdt_SupplementalBalanceSheetDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueEquityLineOfCredit" id="hsdt_StockIssuedDuringPeriodValueEquityLineOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="StockIssuedDuringPeriodSharesEquityLineOfCredit" id="hsdt_StockIssuedDuringPeriodSharesEquityLineOfCredit" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfOperatingLeases" id="hsdt_NumberOfOperatingLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="LicenseAgreementWithAdvancedNeurorehabilitationLlcMember" id="hsdt_LicenseAgreementWithAdvancedNeurorehabilitationLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="InventoryReservesChargedAgainstWorkInProcessInventory" id="hsdt_InventoryReservesChargedAgainstWorkInProcessInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="DeferredLicenseRevenueNotYetRecognized" id="hsdt_DeferredLicenseRevenueNotYetRecognized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DeferredRevenueProductSales" id="hsdt_DeferredRevenueProductSales" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" xbrli:balance="credit" />
  <xsd:element name="DeferredRevenueRecognizedProductSales" id="hsdt_DeferredRevenueRecognizedProductSales" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="EquityIncentive2022PlanMember" id="hsdt_EquityIncentive2022PlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="MaximumNumberOfSharesOfCommonStockThatMayBeIssuedOnExerciseOfIncentiveStockOptions" id="hsdt_MaximumNumberOfSharesOfCommonStockThatMayBeIssuedOnExerciseOfIncentiveStockOptions" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="UnrestrictedCommonStockMember" id="hsdt_UnrestrictedCommonStockMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="TimeBasedStockOptionsAndRestrictedStockUnitsMember" id="hsdt_TimeBasedStockOptionsAndRestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="RisksAndUncertaintiesTextBlock" id="hsdt_RisksAndUncertaintiesTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="PreFundedWarrantsMember" id="hsdt_PreFundedWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="PublicWarrantsMember" id="hsdt_PublicWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="SaleOfStockCombinedOfferingPricePerShare" id="hsdt_SaleOfStockCombinedOfferingPricePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="SaleOfStockPreFundedWarrantsAndAccompanyingPublicWarrantsPricePerShare" id="hsdt_SaleOfStockPreFundedWarrantsAndAccompanyingPublicWarrantsPricePerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" abstract="false" />
  <xsd:element name="PublicOfferingMember" id="hsdt_PublicOfferingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
  <xsd:element name="CommonStockWarrantsMember" id="hsdt_CommonStockWarrantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="true" />
</xsd:schema>
