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Suhas Deshpande, profile picture
Uploaded bySuhas Deshpande
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Power and Electrical Safety in Hospitals

This document discusses electrical safety in hospitals. It covers various electrical hazards like electric shocks and equipment failures. It discusses physiological effects of electricity on patients and how electrical safety depends on factors like frequency, skin resistance, and leakage current. The document also covers protective circuits and standards like ground fault interrupters. It describes classifications for medical devices and hospital areas based on electrical risk. Power distribution systems in hospitals are also discussed along with references.

Related topics:
Electrical Safety Overview•
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EE 507 Advanced Topics in Biomedical SystemsElectrical safety in Hospitals(P5)By SuhasDeshpande
OverviewEnergyElectrical HazardsMacroshock and MicroshockElectrical Susceptible PatientPhysiological effect of ElectricityLeakage currentPatient Isolator designGround Fault InterupterOther Protective CktsMedical device ClassificationArea classificationPower distribution
Energy in hospitalsLighting and HVAC take up largest share of hospital energy billsThe energy requirement s in hospitals are sensitive and 24-7[3]
Electrical HazardsIgnition or Explosion of flammablesElectric shocks due to ground breakingBreakdown of electrical equipmentPatient safety[4]
Microshock and MacroshockMacroshock Hazards When the point of contact is on/inside/near the heartMicroshock HazardsWhen the point of contact is away from the heart[3]
Electrical Susceptible patientsInsertion of a pacemaker catheter electrode from an externally worn pacemaker.Use of a fluid-filled catheterInsertion of an electrode into one of the cardiac chambers for intracardiac ECG measurement.[3]
Physiological effects of electricityFrequency
Skin resistance
Let go Current
InjuryPhysiological effects of electricity Threshold or estimated mean values are given for each effect in a 70 kg human for a 1 to 3 s exposure to 60 Hz current applied via copper wires grasped by the hands.Medical Instrumentation:Application and design, Webster[3]
Leakage currentCapacitive coupling exists between the chasis and power line[4]
Patient Isolator designPatient in ICU/CCU have been designed to be Electrically IsolatedNo conductive path is present between isolated and other sections of the instrument[5]
Ground Fault InterupterNormal conditions INeutral=IhotIf the difference becomes more than a fixed value (5mA)The fault interrupter goes off[3]
Protective ckts[3],[5]
Medical device classificaltionEquipment Function and RiskRisk based classificationClass IClass IIClass III[6]
Medical device classificationClassification by InsulationClass 1
Class 2
Class 3Classification by safety arrangementsType HType BType C[6]