Implanted Medical Device Control for External EMI Environments
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Solution Overview
Problem
The presence of external devices in a patient's environment can cause undesirable electromagnetic interference (EMI) with implanted medical devices, affecting their diagnostic and therapeutic functions and potentially rendering them inoperable in certain environments.
Innovation Solution
A method for controlling an implanted medical device that involves receiving a detection signal indicating the presence of an external device, selecting an operating mode based on a unique identifier associated with predefined settings, and adjusting the device to minimize EMI by modifying functions or deactivating components as necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the medical device operates in a standard mode without detection capabilities, then the device complexity is reduced, but the reliability deteriorates due to electromagnetic interference from external devices
Solution Approach 1:
The medical device performs preliminary detection of external devices (such as MRI machines) before therapeutic functions are activated. The control unit checks whether an external device is present in the environment, and only allows therapy delivery when no interfering external device is detected, preventing EMI-related failures before they occur.
Solution Approach 2:
A control unit acts as an intermediary between the sensing module and the therapy delivery module. It receives detection signals from the sensing module, processes the information about external devices, and makes decisions about whether to enable or disable therapeutic functions, thereby mediating the response to electromagnetic interference.
2Reliability
If the medical device continuously monitors for external devices, then the reliability is improved, but the energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the sensing module performs periodic detection of external devices at predetermined intervals. This reduces energy consumption compared to continuous monitoring while still maintaining adequate detection capability to ensure reliable operation when external devices are present.
3Object-affected harmful factors
If the device deactivates therapeutic functions when external devices are detected, then the harmful electromagnetic interference is reduced, but the diagnostic and therapeutic functionality deteriorates
Solution Approach 1:
The control unit dynamically adjusts the operational state of the therapy delivery module based on real-time detection results. When an external device is detected, therapeutic functions are deactivated to prevent EMI; when no external device is present, therapeutic functions are reactivated. This dynamic adaptation allows the device to maintain full functionality in safe environments while protecting against interference in hazardous environments.
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
This approach ensures safe and efficient operation of implanted medical devices near external devices, reducing EMI-related inaccuracies and malfunctions without manual intervention, allowing patients to work in potentially hostile environments.
Implementation Method 1
a sensing module configured to detect a presence of an external device in an environment of the patient, wherein the detecting comprises receiving a detection signal from the external device
Data Source
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AI summary
A method for controlling a medical device (1) implanted in a patient (2) in presence of an external device (4) in the patient's (2) environment comprises: receiving a detection signal (6) indicating the presence of the external device (4) in the patient's (2) environment, wherein the detection signal (6) comprises a unique identifier for the external device (4); selecting an operating mode for the medical device (1) by comparing the identifier to a list (10) of known identifiers (11), wherein each known identifier (11) is associated with a predefined operating mode (12) for the medical device (1); and applying the selected operating mode (12) to the medical device (1), thereby adjusting the medical device (1) so that undesirable electromagnetic interaction between the medical device (1) and the external device (4) is reduced.