Dynamic Grounding Impedance for Cardiac Floating Safety
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Solution Overview
Problem
Medical apparatuses struggle to maintain high electrical safety while minimizing disturbances to electrocardiographs due to static charges, as existing grounding systems either prevent necessary insulation or fail to dissipate charges effectively.
Innovation Solution
A grounding system with adjustable impedance that switches between low and high impedance configurations based on detected electrical currents, using resistances and sensors to ensure patient safety and reduce disturbances to connected systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a grounding device is used to dissipate static charges, then disturbance to electrocardiograph is reduced, but electrical insulation required for Cardiac Floating classification is compromised
Solution Approach 1:
The grounding system dynamically adjusts its impedance based on detected electrical conditions. When static charges are detected that could disturb the electrocardiograph, the system automatically switches to a grounded state with low impedance to dissipate charges. When no such charges are present, the system switches to an insulated state with high impedance to maintain Cardiac Floating classification and electrical safety.
Solution Approach 2:
The system changes the electrical parameter (impedance) of the grounding connection based on operational conditions. By using a switchable configuration that alternates between low impedance (grounded) and high impedance (insulated) states, the system adapts to different operational requirements, resolving the contradiction between charge dissipation and electrical insulation.
2Reliability
If high electrical insulation is maintained for Cardific Floating classification, then patient electrical safety is ensured, but static charges cannot be dissipated and disturb electrocardiograph operation
Solution Approach 1:
The grounding system transitions from a static high-impedance insulated state to a dynamic state where impedance can be reduced on demand. The system continuously monitors for static charges and automatically switches to a low-impedance grounded state when charges are detected, allowing charge dissipation while maintaining electrical safety through controlled, temporary grounding rather than permanent insulation.
Solution Approach 2:
The system uses feedback from charge detection to control the grounding state. When static charges are detected that would disturb the electrocardiograph, the system activates grounding to dissipate charges. The feedback mechanism ensures grounding is applied only when necessary, maintaining electrical safety by default while resolving charge accumulation issues when they arise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively disperses electrical charges during normal operation while maintaining high electrical safety standards, allowing classification as Cardiac Floating and ensuring correct functioning of connected devices like electrocardiographs.
Implementation Method 1
a grounding device connected to at least a fluid transport line of the medical apparatus by means of a tubular connector made of an electrically-conductive plastic material. The grounding device grounds the static electrical charges
Implementation Method 2
a medical apparatus having the CF classification, being characterized by a high degree of electrical insulation, i.e. a high level of impedance between the grounding protection and the part of the apparatus applied to the patient
Data Source
AI summary
In a hemodiafiltration apparatus, a membrane device (2) comprises a blood chamber (3) and a fluid chamber (4) separated by a semipermeable membrane (5). A grounding device (17) is connected to the discharge line by means of a tubular connector (16) made of an electrically-conductive plastic material. The grounding device can disconnect the grounding connection if the leakage current measured on a patient (1) connected to the apparatus exceeds a predetermined value. The apparatus can be classified as Cardiac Floating and, at the same time, causes no disturbances to an electrocardiograph connected to the patient.