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<element name="ContractWithCustomerPerformanceObligationAndPayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ContractWithCustomerPerformanceObligationAndPayment" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ReclassificationOfStockBasedCompensationLiabilityClassifiedStockOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ReclassificationOfStockBasedCompensationLiabilityClassifiedStockOptions" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ReclassificationToAdditionalPaidInCapitalUponModificationOfStockOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ReclassificationToAdditionalPaidInCapitalUponModificationOfStockOptions" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="OperatingLeaseRightOfUseAssetAmortization" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseRightOfUseAssetAmortization" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfOperatingLease" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_NumberOfOperatingLease" substitutionGroup="xbrli:item" />
<element name="WrittenNoticePeriodForAdditionalRenewalTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_WrittenNoticePeriodForAdditionalRenewalTerm" substitutionGroup="xbrli:item" />
<element name="AdditionalRenewalTermOfExclusiveRight" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_AdditionalRenewalTermOfExclusiveRight" substitutionGroup="xbrli:item" />
<element name="InitialTermOfExclusiveRight" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_InitialTermOfExclusiveRight" substitutionGroup="xbrli:item" />
<element name="NumberOfPatientsToCollectData" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfPatientsToCollectData" substitutionGroup="xbrli:item" />
<element name="BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_BusinessAcquisitionPurchasePriceAllocationGoodwillNotExpectedTaxDeductibleAmount" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="PotentialAmountReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_PotentialAmountReceivable" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfDevices" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfDevices" substitutionGroup="xbrli:item" />
<element name="OtherReceivablesRefundsRelatedToGoodsServicesAndSalesTax" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_OtherReceivablesRefundsRelatedToGoodsServicesAndSalesTax" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfRemainingDevicesRecordedAsDeferredRevenue" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfRemainingDevicesRecordedAsDeferredRevenue" substitutionGroup="xbrli:item" />
<element name="NumberOfDevicesResultedInRecognitionOfRevenue" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfDevicesResultedInRecognitionOfRevenue" substitutionGroup="xbrli:item" />
<element name="EmployeeAndNonEmployeeStockOptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_EmployeeAndNonEmployeeStockOptionMember" substitutionGroup="xbrli:item" />
<element name="ProprietaryTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ProprietaryTechnologyMember" substitutionGroup="xbrli:item" />
<element name="ReacquiredRightsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ReacquiredRightsMember" substitutionGroup="xbrli:item" />
<element name="ComputerSoftwareAndHardwareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ComputerSoftwareAndHardwareMember" substitutionGroup="xbrli:item" />
<element name="PonsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_PonsMember" substitutionGroup="xbrli:item" />
<element name="FurnitureAndFixturesAndLeaseholdImprovementsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_FurnitureAndFixturesAndLeaseholdImprovementsMember" substitutionGroup="xbrli:item" />
<element name="HeuroCanadaIncorporationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_HeuroCanadaIncorporationMember" substitutionGroup="xbrli:item" />
<element name="HealthTechConnexIncorporationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_HealthTechConnexIncorporationMember" substitutionGroup="xbrli:item" />
<element name="ClinicalResearchAndCoPromotionAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ClinicalResearchAndCoPromotionAgreementMember" substitutionGroup="xbrli:item" />
<element name="CoPromotionAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_CoPromotionAgreementMember" substitutionGroup="xbrli:item" />
<element name="SharePurchaseAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_SharePurchaseAgreementMember" substitutionGroup="xbrli:item" />
<element name="StrategicAllianceAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_StrategicAllianceAgreementMember" substitutionGroup="xbrli:item" />
<element name="ServicesPerformedUsingNeurocatchDeviceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ServicesPerformedUsingNeurocatchDeviceMember" substitutionGroup="xbrli:item" />
<element name="NeurocatchDeviceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_NeurocatchDeviceMember" substitutionGroup="xbrli:item" />
<element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherReceivables" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherReceivables" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="AcquiredProprietarySoftwareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AcquiredProprietarySoftwareMember" substitutionGroup="xbrli:item" />
<element name="NonCurrentReceivableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_NonCurrentReceivableMember" substitutionGroup="xbrli:item" />
<element name="BlackScholesModelMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_BlackScholesModelMember" substitutionGroup="xbrli:item" />
<element name="ScheduleOfStockholdersEquityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ScheduleOfStockholdersEquityTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="ScheduleOfStockholdersEquityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ScheduleOfStockholdersEquityLineItems" substitutionGroup="xbrli:item" />
<element name="AccruedShareIssuanceCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_AccruedShareIssuanceCost" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueOfWarrantsAtIssuance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfWarrantsAtIssuance" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ExpenseRelatedToDistributionOfCommonStockAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ExpenseRelatedToDistributionOfCommonStockAndWarrants" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ProceedsFromIssuanceOfCommonStockNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ProceedsFromIssuanceOfCommonStockNet" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="PaymentsForOfferingExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PaymentsForOfferingExpenses" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PaymentsForUnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PaymentsForUnderwritingDiscountsAndCommissions" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueOfWarrantsReclassifiedToAdditionalPaidInCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfWarrantsReclassifiedToAdditionalPaidInCapital" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="NumberOfTranches" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_NumberOfTranches" substitutionGroup="xbrli:item" />
<element name="DecreaseInAdditionalPaidInCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_DecreaseInAdditionalPaidInCapital" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="WarrantsExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsExpirationDate" substitutionGroup="xbrli:item" />
<element name="GrossProceedsFromIssuanceOrSaleOfEquity" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_GrossProceedsFromIssuanceOrSaleOfEquity" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ClassOfWarrantOrRightCancelledDueToExpiration" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ClassOfWarrantOrRightCancelledDueToExpiration" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightExercised" substitutionGroup="xbrli:item" />
<element name="OtherCashIssuanceCostsRelatedToOffering" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OtherCashIssuanceCostsRelatedToOffering" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="OfferingExpirationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OfferingExpirationPeriod" substitutionGroup="xbrli:item" />
<element name="OptionsExercisePricePerUnit" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OptionsExercisePricePerUnit" substitutionGroup="xbrli:item" />
<element name="OptionsExercisableToPurchaseUnits" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OptionsExercisableToPurchaseUnits" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantsOrRightExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantsOrRightExpirationDate" substitutionGroup="xbrli:item" />
<element name="MaximumAggregateOfferingAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_MaximumAggregateOfferingAmount" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="WarrantsSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsSevenMember" substitutionGroup="xbrli:item" />
<element name="WarrantsFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsFourMember" substitutionGroup="xbrli:item" />
<element name="TrancheThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_TrancheThreeMember" substitutionGroup="xbrli:item" />
<element name="TrancheTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_TrancheTwoMember" substitutionGroup="xbrli:item" />
<element name="TrancheOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_TrancheOneMember" substitutionGroup="xbrli:item" />
<element name="NovemberTwoThousandAndNineteenPublicOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_NovemberTwoThousandAndNineteenPublicOfferingMember" substitutionGroup="xbrli:item" />
<element name="NovemberTwoThousandAndEighteenPublicOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_NovemberTwoThousandAndEighteenPublicOfferingMember" substitutionGroup="xbrli:item" />
<element name="AprilTwoThousandSixteenOfferingandMayTwoThousandSixteenOverAllotmentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AprilTwoThousandSixteenOfferingandMayTwoThousandSixteenOverAllotmentMember" substitutionGroup="xbrli:item" />
<element name="PublicOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_PublicOfferingMember" substitutionGroup="xbrli:item" />
<element name="MarchTwoThousandTwentyOfferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_MarchTwoThousandTwentyOfferingMember" substitutionGroup="xbrli:item" />
<element name="ThemarketofferingagreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ThemarketofferingagreementMember" substitutionGroup="xbrli:item" />
<element name="MarchtwothousandandtwentyofferingMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_MarchtwothousandandtwentyofferingMember" substitutionGroup="xbrli:item" />
<element name="WarrantsGrantedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsGrantedMember" substitutionGroup="xbrli:item" />
<element name="FairValueOfWarrantLiabilityAtIssuance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfWarrantLiabilityAtIssuance" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueOfWarrantsLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_FairValueOfWarrantsLiability" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueOfPreviouslyLiabilityClassifiedWarrantsReclassifiedToAdditionalPaidInCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfPreviouslyLiabilityClassifiedWarrantsReclassifiedToAdditionalPaidInCapital" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="FairValueOfPreviouslyEquityClassifiedWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfPreviouslyEquityClassifiedWarrants" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="FairValueOfWarrantsLiabilityExercise" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_FairValueOfWarrantsLiabilityExercise" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ClassOfWarrantOrRightExercisePriceOutstandingAndExercisableOfWarrantsOrRights" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ClassOfWarrantOrRightExercisePriceOutstandingAndExercisableOfWarrantsOrRights" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExercisePriceExercisedOfWarrantsOrRights" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightExercisePriceExercisedOfWarrantsOrRights" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExercisePriceExpiredOfWarrantsOrRights" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightExercisePriceExpiredOfWarrantsOrRights" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExercisePriceGrantedOfWarrantsOrRights" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightExercisePriceGrantedOfWarrantsOrRights" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightOutstandingAndExercisable" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ClassOfWarrantOrRightOutstandingAndExercisable" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightExpired" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightExpired" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantOrRightGranted" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantOrRightGranted" substitutionGroup="xbrli:item" />
<element name="WarrantsFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsFiveMember" substitutionGroup="xbrli:item" />
<element name="WarrantsThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsThreeMember" substitutionGroup="xbrli:item" />
<element name="WarrantsOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsOneMember" substitutionGroup="xbrli:item" />
<element name="WarrantsNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsNineMember" substitutionGroup="xbrli:item" />
<element name="WarrantsEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsEightMember" substitutionGroup="xbrli:item" />
<element name="WarrantsfourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsfourMember" substitutionGroup="xbrli:item" />
<element name="WarrantsfiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_WarrantsfiveMember" substitutionGroup="xbrli:item" />
<element name="NonEmployeeStockOptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_NonEmployeeStockOptionMember" substitutionGroup="xbrli:item" />
<element name="SharebasedCompensationArrangementByStockbasedCompensationLiabilityReclassificationToAdditionalPaidInCapitalUponModificationOfStockOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_SharebasedCompensationArrangementByStockbasedCompensationLiabilityReclassificationToAdditionalPaidInCapitalUponModificationOfStockOptions" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="SharebasedCompensationArrangementByReductionToStockbasedCompensationLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_SharebasedCompensationArrangementByReductionToStockbasedCompensationLiability" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="CommonStockCapitalSharesReservedForFutureIssuanceNewShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_CommonStockCapitalSharesReservedForFutureIssuanceNewShares" substitutionGroup="xbrli:item" />
<element name="Stockbasedcompensationexpensereversal" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_Stockbasedcompensationexpensereversal" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="TwoThousandSixteenOmnibusIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_TwoThousandSixteenOmnibusIncentivePlanMember" substitutionGroup="xbrli:item" />
<element name="TwoThousandEighteenOmnibusIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_TwoThousandEighteenOmnibusIncentivePlanMember" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" substitutionGroup="xbrli:item" />
<element name="NumberOfCommonStockSharesWithheld" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfCommonStockSharesWithheld" substitutionGroup="xbrli:item" />
<element name="StockIssuedDuringPeriodSharesStockOptionsExercisedOnCashlessBasis" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_StockIssuedDuringPeriodSharesStockOptionsExercisedOnCashlessBasis" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPostModificationPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPostModificationPeriodWeightedAverageGrantDateFairValue" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionOutstandingNumber" substitutionGroup="xbrli:item" />
<element name="OptionTwentyFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyFiveMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyFourMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyThreeMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyTwoMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyOneMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyMember" substitutionGroup="xbrli:item" />
<element name="OptionNineteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionNineteenMember" substitutionGroup="xbrli:item" />
<element name="OptionEighteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionEighteenMember" substitutionGroup="xbrli:item" />
<element name="OptionsSeventeenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionsSeventeenMember" substitutionGroup="xbrli:item" />
<element name="OptionSixteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionSixteenMember" substitutionGroup="xbrli:item" />
<element name="OptionFifteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionFifteenMember" substitutionGroup="xbrli:item" />
<element name="OptionFourteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionFourteenMember" substitutionGroup="xbrli:item" />
<element name="OptionThirteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionThirteenMember" substitutionGroup="xbrli:item" />
<element name="OptionTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwelveMember" substitutionGroup="xbrli:item" />
<element name="OptionElevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionElevenMember" substitutionGroup="xbrli:item" />
<element name="OptionTenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTenMember" substitutionGroup="xbrli:item" />
<element name="OptionNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionNineMember" substitutionGroup="xbrli:item" />
<element name="OptionEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionEightMember" substitutionGroup="xbrli:item" />
<element name="OptionSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionSevenMember" substitutionGroup="xbrli:item" />
<element name="OptionSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionSixMember" substitutionGroup="xbrli:item" />
<element name="OptionFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionFiveMember" substitutionGroup="xbrli:item" />
<element name="OptionFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionFourMember" substitutionGroup="xbrli:item" />
<element name="OptionThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionThreeMember" substitutionGroup="xbrli:item" />
<element name="OptionTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwoMember" substitutionGroup="xbrli:item" />
<element name="OptionOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionOneMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyNineMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyNineMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentySevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentySevenMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentySixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentySixMember" substitutionGroup="xbrli:item" />
<element name="OptionTwentyEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OptionTwentyEightMember" substitutionGroup="xbrli:item" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodFairValue" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodReclassificationToAdditionalPaidInCapital" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodReclassificationToAdditionalPaidInCapital" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInNonEmployeeChangeInFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInNonEmployeeChangeInFairValue" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodForeignExchangeGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodForeignExchangeGains" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodCancelled" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodCancelled" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodExercised" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodExercised" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="NumberOfRestrictedStockUnitsWithheldForTaxes" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfRestrictedStockUnitsWithheldForTaxes" substitutionGroup="xbrli:item" />
<element name="AccruedFranchiseFeeCurrent" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_AccruedFranchiseFeeCurrent" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="AccruedSeveranceCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_AccruedSeveranceCost" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="IncomeTaxReconciliationChangeInDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_IncomeTaxReconciliationChangeInDerivativeLiability" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="IncomeTaxReconciliationNondeductibleExpenseChangeInOtherPermanentDifference" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_IncomeTaxReconciliationNondeductibleExpenseChangeInOtherPermanentDifference" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="IncomeTaxReconciliationExpectedIncomeTaxRecovery" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_IncomeTaxReconciliationExpectedIncomeTaxRecovery" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="IncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_IncomeTaxesTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_IncomeTaxesLineItems" substitutionGroup="xbrli:item" />
<element name="OperatingLossCarryforwardsExpirationYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLossCarryforwardsExpirationYear" substitutionGroup="xbrli:item" />
<element name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_CommitmentsAndContingenciesTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_CommitmentsAndContingenciesLineItems" substitutionGroup="xbrli:item" />
<element name="NetProftAndLossBasis" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NetProftAndLossBasis" substitutionGroup="xbrli:item" />
<element name="MaximumAmountOfLongTermPurchaseCommitment" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_MaximumAmountOfLongTermPurchaseCommitment" substitutionGroup="xbrli:item" />
<element name="PartialConsiderationGrantedPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PartialConsiderationGrantedPeriod" substitutionGroup="xbrli:item" />
<element name="NumberOfClinicsAuthorized" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfClinicsAuthorized" substitutionGroup="xbrli:item" />
<element name="NumberOfAdditionalClinics" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfAdditionalClinics" substitutionGroup="xbrli:item" />
<element name="NumberOfFoundingClinics" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_NumberOfFoundingClinics" substitutionGroup="xbrli:item" />
<element name="LongTermPurchaseCommitmentNoticePeriodToCancelRenewalPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_LongTermPurchaseCommitmentNoticePeriodToCancelRenewalPeriod" substitutionGroup="xbrli:item" />
<element name="LongTermPurchaseCommitmentAutoRenewalPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_LongTermPurchaseCommitmentAutoRenewalPeriod" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseAnnualIncreaseInRentalPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_OperatingLeaseAnnualIncreaseInRentalPercentage" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseRentPlusUtilitiesBeginningDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseRentPlusUtilitiesBeginningDate" substitutionGroup="xbrli:item" />
<element name="LongTermPurchaseCommitmentExtendedPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_LongTermPurchaseCommitmentExtendedPeriod" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseOptionToExtendLeaseTermDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseOptionToExtendLeaseTermDate" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseOptionToExtendLeaseTermYear" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseOptionToExtendLeaseTermYear" substitutionGroup="xbrli:item" />
<element name="OperatingLeaseCommencementDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseCommencementDate" substitutionGroup="xbrli:item" />
<element name="EffectiveDateOfTerminationOfAgreement" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_EffectiveDateOfTerminationOfAgreement" substitutionGroup="xbrli:item" />
<element name="PercentageOfRoyaltyOnSales" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PercentageOfRoyaltyOnSales" substitutionGroup="xbrli:item" />
<element name="PenaltyPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_PenaltyPayable" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PercentageOfRoyaltyOnNetRevenue" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PercentageOfRoyaltyOnNetRevenue" substitutionGroup="xbrli:item" />
<element name="DecreaseInOperatingLeaseRightOfUseAssetPartialTermination" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_DecreaseInOperatingLeaseRightOfUseAssetPartialTermination" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="DecreaseInOperatingLeaseLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_DecreaseInOperatingLeaseLiability" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="OperatingLeaseOptionToExtendLeaseTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_OperatingLeaseOptionToExtendLeaseTerm" substitutionGroup="xbrli:item" />
<element name="ManufacturingAndSupplyAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ManufacturingAndSupplyAgreementMember" substitutionGroup="xbrli:item" />
<element name="AssetPurchaseAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AssetPurchaseAgreementMember" substitutionGroup="xbrli:item" />
<element name="LicenseAgreementForExclusiveRightsOnPatentPendingTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_LicenseAgreementForExclusiveRightsOnPatentPendingTechnologyMember" substitutionGroup="xbrli:item" />
<element name="KeyTronicCorporationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_KeyTronicCorporationMember" substitutionGroup="xbrli:item" />
<element name="AltairLimitedLiabilityCompanyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AltairLimitedLiabilityCompanyMember" substitutionGroup="xbrli:item" />
<element name="AAndBCompanyLimitedMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AAndBCompanyLimitedMember" substitutionGroup="xbrli:item" />
<element name="AdvancedNeuroRehabilitationLimitedLiabilityCompanyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_AdvancedNeuroRehabilitationLimitedLiabilityCompanyMember" substitutionGroup="xbrli:item" />
<element name="PaycheckProtectionProgramMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_PaycheckProtectionProgramMember" substitutionGroup="xbrli:item" />
<element name="ConsultingFeePayableToDirectors" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_ConsultingFeePayableToDirectors" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PercentageOfBeneficiallyOwnedCommonStock" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_PercentageOfBeneficiallyOwnedCommonStock" substitutionGroup="xbrli:item" />
<element name="ConsultingAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ConsultingAgreementMember" substitutionGroup="xbrli:item" />
<element name="ClinvueLLCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ClinvueLLCMember" substitutionGroup="xbrli:item" />
<element name="MontelMediaIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_MontelMediaIncMember" substitutionGroup="xbrli:item" />
<element name="ScheduleOfCostSharingAgreementAndCooperativeResearchAndDevelopmentAgreementTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ScheduleOfCostSharingAgreementAndCooperativeResearchAndDevelopmentAgreementTable" substitutionGroup="xbrldt:hypercubeItem" />
<element name="CooperativeResearchAndDevelopmentAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_CooperativeResearchAndDevelopmentAgreementMember" substitutionGroup="xbrli:item" />
<element name="ScheduleOfCostSharingAgreementAndCooperativeResearchAndDevelopmentAgreementLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_ScheduleOfCostSharingAgreementAndCooperativeResearchAndDevelopmentAgreementLineItems" substitutionGroup="xbrli:item" />
<element name="ReceiptOfExpenseReimbursement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ReceiptOfExpenseReimbursement" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="ExtendedExpirationDateOfOriginalContract" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ExtendedExpirationDateOfOriginalContract" substitutionGroup="xbrli:item" />
<element name="ExpirationYearOfOriginalContract" type="xbrli:gYearItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ExpirationYearOfOriginalContract" substitutionGroup="xbrli:item" />
<element name="ExpirationDateOfOriginalContract" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ExpirationDateOfOriginalContract" substitutionGroup="xbrli:item" />
<element name="ReimbursableTrialCost" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ReimbursableTrialCost" substitutionGroup="xbrli:item" xbrli:balance="debit" />
<element name="UnitedStatesArmyMedicalResearchAndMaterielCommandMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_UnitedStatesArmyMedicalResearchAndMaterielCommandMember" substitutionGroup="xbrli:item" />
<element name="ClassOfWarrantsOrRightExpirationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" id="hsdt_ClassOfWarrantsOrRightExpirationPeriod" substitutionGroup="xbrli:item" />
<element name="SubscriptionToParticipateSubsequentFinancing" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_SubscriptionToParticipateSubsequentFinancing" substitutionGroup="xbrli:item" xbrli:balance="credit" />
<element name="PercentageOfRightToParticipateSubsequentFinancing" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" id="hsdt_PercentageOfRightToParticipateSubsequentFinancing" substitutionGroup="xbrli:item" />
<element name="PlacementAgentMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_PlacementAgentMember" substitutionGroup="xbrli:item" />
<element name="OfficerAffiliatesOfAnOfficerAndDirectorMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="hsdt_OfficerAffiliatesOfAnOfficerAndDirectorMember" substitutionGroup="xbrli:item" />
</schema>
