Medical Cable Authentication Circuit for Sensor Verification
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Solution Overview
Problem
Existing medical cable systems lack a reliable method to authenticate and ensure compatibility between medical sensors and patient monitors, leading to potential safety issues due to incorrect or improper connections, which can result in inaccurate patient health evaluations.
Innovation Solution
A medical cable with an integrated authentication circuit that includes a switch module and conductive paths to verify the connection between the sensor and patient monitor, generating a target voltage signal to confirm authenticity and prevent measurement errors when the sensor is properly connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an authentication circuit is added to the medical cable, then reliability of connection verification is improved, but device complexity increases
Solution Approach 1:
The authentication circuit is integrated directly into the medical cable assembly, merging the authentication function with the existing cable structure. This approach improves connection verification reliability while minimizing the increase in device complexity by utilizing the cable's existing physical form factor and integrating components within the cable housing rather than adding separate external authentication devices.
Solution Approach 2:
The authentication circuit performs verification of the sensor-to-monitor connection before allowing data transmission. The circuit includes a test signal generator that sends authentication signals through the cable to verify proper connection, and only after successful verification does the system enable physiological data transmission, ensuring reliability before operation.
2Reliability
If authentication verification is implemented, then patient safety is improved, but measurement time increases
Solution Approach 1:
The authentication circuit performs verification using periodic test signals at predetermined intervals during the connection setup process. The monitor sends authentication test signals through the cable at specific time points, and the system automatically verifies connection integrity without requiring manual intervention, minimizing the time added to the setup process while ensuring patient safety.
3Measurement precision
If switch module is added to control signal paths, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The cable's signal transmission paths are segmented into separate conductive paths, with individual switch modules controlling each path. This segmentation allows the system to selectively enable or disable specific signal channels based on authentication results, improving measurement accuracy by ensuring only verified connections transmit data, while keeping each switch module simple and modular to minimize overall complexity increase.
Data Source
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AI summary
Medical cable authentication apparatuses and methods are disclosed. Some embodiments herein provide a medical cable assembly for use in a patient monitoring system including authentication circuit. The authentication circuit can provide a signal indicative of whether the medical cable assembly is compatible, or desirable for use with a particular patient monitor and/or sensor, The authentication circuit can include a substantially constant current source that drives a capacitor, wherein a voltage signal provided by a patient monitor drives the current source, and the voltage across the capacitor is used to generate an authentication output signal.