Systematic Analysis of Faults and Errors -- Example
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System:PCA InterlockSystem Boundary
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FundamentalsSystemEnvironment
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NameReferencePCA PumpPatient
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App Logic
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Accident Levels:AL.DeathOrSeriousInjuryN / APulse Oximeter
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Capnograph
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Accidents:Acc.PatientHarmedAL.DeathOrSeriousInjury
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Hazardous FactorSystem ElementSystem Element StateEnv. ElementEnv. Element State
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Hazards:H.TooMuchAnalgesicAcc.PatientHarmedAnalgesicPCA PumpPumpingPatientNearHarm
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Safety Constraints:SC.DontODPatientH.TooMuchAnalgesic
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Explanations
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ReferenceExplanation
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Acc.PatientHarmedThe patient is harmed or seriously injured as a result of the App's actions
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H.TooMuchAnalgesicThe patient is given more analgesic than they can safely tolerate
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ArchitectureAs modeled by Arney-etal in ICCPS10 (in section 4.3) with some modifications
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A lot of possibly unmeetable assumptions (guaranteed timing of network and app)
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Modified to include RR and EtCO2 physiological monitors (in addition to SpO2)
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Fundamentals
Control Structure
PCA Pump
App --> Pump Connection
App Logic
SpO2 --> App Connection
Pulse Oximeter
EtCO2 --> App Connection
RR --> App Connection
Capnograph
Fundamentals For Submission
PCA Pump For Submission