Canister Fluid Level Sensing Circuitry With Leakage Current Isolation
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Solution Overview
Problem
Existing negative pressure wound therapy systems lack efficient and reliable methods for monitoring fluid levels in canisters, which can lead to inefficiencies and potential patient safety risks due to leakage currents and incorrect device orientation.
Innovation Solution
A fluid level sensing circuitry system is integrated into the canister, utilizing electrodes and resistors to detect fluid levels and protect against leakage currents, with features like impedance detection and wireless communication to ensure accurate monitoring and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluid level sensing circuitry with electrodes is integrated into the canister to monitor fluid levels, then measurement precision is improved, but leakage current and patient safety risks worsen
Solution Approach 1:
Resistors are introduced as intermediary components between the electrodes and the fluid. These resistors limit the leakage current that can flow through the fluid and patient, while still allowing the sensing circuitry to detect fluid levels through impedance changes. The resistors act as a protective barrier that maintains measurement capability while reducing harmful current exposure.
2Reliability
If the sensing circuitry operates continuously to monitor fluid levels, then reliability is improved, but energy consumption increases
Solution Approach 1:
The sensing circuitry operates in periodic intervals rather than continuously. The system periodically measures impedance between electrodes to detect fluid levels, then enters a low-power state. This periodic operation maintains reliable monitoring capability while significantly reducing average power consumption compared to continuous operation.
3Adaptability or versatility
If the canister is positioned in various orientations during therapy, then adaptability is improved, but incorrect orientation detection becomes more difficult
Solution Approach 1:
The sensing circuitry is designed to detect fluid levels and orientations using the same electrode assembly regardless of canister orientation. The system measures impedance characteristics that remain interpretable in any orientation, making the sensing mechanism universal across different positional configurations without requiring separate detection systems for each orientation.
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 provides reliable fluid level monitoring, preventing leakage and ensuring safe operation by detecting short circuits and adjusting power based on device orientation, enhancing the efficiency and safety of negative pressure wound therapy.
Implementation Method 1
The IC can be configured to determine a level of fluid stored in the canister based on a signal received from the first and second electrodes. Impedance across the first and second electrodes can decrease responsive to the fluid in the canister reaching the first and second electrodes.
Implementation Method 2
The fluid level sensing circuitry can include first and second resistors connected to the first and second connectors and configured to protect against leakage current from the fluid level sensing circuitry.
Data Source
AI summary
A negative pressure wound therapy system can include a fluid level detection circuitry positioned in a canister. The fluid level detection circuitry can include a pair of electrodes and a logic circuitry configured to detect fluid level based on one or more signals from the pair of electrodes. The logic circuitry can be protected and isolated from the patient's body to prevent flow of any leakage current through the patient's body using one or more approaches disclosed herein.