Implantable Device Asynchronous Mode for Cautery Interference
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Solution Overview
Problem
Current medical devices, particularly pacemakers and ICDs, are unable to safely operate during cautery applications due to interference from electromagnetic fields, which can cause asynchronous stimulation and pose a proarrhythmic risk, especially in ICD patients, as existing interference detection systems fail to maintain asynchronous mode during pulsed disturbances.
Innovation Solution
An implantable medical device equipped with a unit for detecting electromagnetic interference, featuring sensors and a control unit with a timer and stimulation capabilities, allowing for extended asynchronous stimulation during detected non-physiological signals or electromagnetic interference, ensuring safe operation by adjusting stimulation rates and modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asynchronous operating mode is activated to enable cautery applications, then electromagnetic interference protection is improved, but proarrhythmic risk increases due to unnecessary asynchronous pacing
Solution Approach 1:
The device dynamically adjusts the asynchronous operating mode duration based on detected interference characteristics. The control unit activates asynchronous mode only when interference is detected and deactivates it after a predetermined time period, creating a time-dependent dynamic response that balances protection needs against unnecessary pacing risks
Solution Approach 2:
The detection unit continuously monitors for electromagnetic interference and provides feedback to the control unit. Based on this feedback, the control unit decides whether to activate or deactivate the asynchronous operating mode, creating a closed-loop control system that responds to actual interference conditions rather than maintaining a static state
2Speed
If current interference detection systems are used, then detection speed is improved, but reliability deteriorates because they leave asynchronous mode immediately after interference ends, failing pulsed disturbances
Solution Approach 1:
The control unit is programmed with predetermined time periods for maintaining asynchronous mode after interference detection. This preliminary action ensures that the device maintains protection status for a sufficient duration to cover pulsed interference patterns, preventing immediate deactivation that would leave the device vulnerable
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 solution enables reliable stimulation during cautery applications, preventing cardiac arrest and minimizing the risk of asynchronous pacing, allowing for safe use of high-frequency and microwave diathermy in medical procedures by maintaining asynchronous stimulation until the interference ceases.
Implementation Method 1
a unit for detecting electromagnetic interference fields, the unit having at least one sensor and/or indicator for electromagnetic interference fields
Data Source
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AI summary
The device has an electrode line which is connected at an end to a control unit and/or to the unit configured to detect electromagnetic interference fields comprising stimulation timer (250). The detection unit evaluates the detected signals as non-physiological signals for a specifiable time period, and/or for a next specified time period the stimulation unit is placed in an asynchronous operating state in which a wearer of the device is asynchronously stimulated, when non-physiological signals and/or electromagnetic interference fields are detected. An independent claim is included for method for operating implantable medical device.