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  <xsd:import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd" />
  <xsd:import namespace="http://fasb.org/us-roles/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.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="ShareIssuanceCostsIncludedInAccountsPayableAndAccruedLiabilities" id="hsdt_ShareIssuanceCostsIncludedInAccountsPayableAndAccruedLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" 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="NumberOfRemainingDevicesRecordedAsDeferredRevenue" id="hsdt_NumberOfRemainingDevicesRecordedAsDeferredRevenue" 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="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="AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCostsShares" id="hsdt_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCostsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" 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="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:element name="ScheduleOfWeightedAverageAssumptionsUsedForFairValueOfWarrantsTableTextBlock" id="hsdt_ScheduleOfWeightedAverageAssumptionsUsedForFairValueOfWarrantsTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonCashShareIssuanceCosts" id="hsdt_NonCashShareIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="OperatingCapacityPercentage" id="hsdt_OperatingCapacityPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="NumberOfSuppliersExperiencingDifficultiesRelatedToCovid19" id="hsdt_NumberOfSuppliersExperiencingDifficultiesRelatedToCovid19" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="ShareBasedCompensationAnnualIncreaseInAuthorizedSharesAsPercentageOfFullyDilutedSharesOfCommonStockOutstanding" id="hsdt_ShareBasedCompensationAnnualIncreaseInAuthorizedSharesAsPercentageOfFullyDilutedSharesOfCommonStockOutstanding" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
  <xsd:element name="CashPaidShareIssuanceCostsAllocatedBetweenEquityAndDerivativeLiability" id="hsdt_CashPaidShareIssuanceCostsAllocatedBetweenEquityAndDerivativeLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="credit" />
  <xsd:element name="ProceedsFromNewIssuanceAllocatedBetweenEquityAndDerivativeLiability" id="hsdt_ProceedsFromNewIssuanceAllocatedBetweenEquityAndDerivativeLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" xbrli:balance="debit" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValuePerOption" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsFairValuePerOption" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" abstract="false" />
</xsd:schema>
