Implantable Medical Device Automatic Mode Switching
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Solution Overview
Problem
Manual programming of implantable medical devices to enter and exit exposure mode during magnetic disturbances, such as MRI scans, is prone to human error and increases procedural costs, as it requires clinician presence and intervention.
Innovation Solution
Implantable medical devices equipped with magnetic field sensors and controllers that automatically detect magnetic disturbances, using hysteresis timers and confirmation counters to switch between normal and exposure modes, eliminating the need for manual programming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual programming is used to switch between normal and exposure modes, then the device can operate in exposure mode during magnetic disturbances, but human error and procedural costs increase
Solution Approach 1:
The implantable medical device automatically detects magnetic disturbances using an integrated magnetic field sensor and autonomously switches between normal and exposure modes without requiring external clinician intervention. The device monitors the magnetic field environment, determines when magnetic disturbance thresholds are exceeded, and independently changes its operational mode, thereby eliminating manual programming requirements and reducing human error
Solution Approach 2:
The manual mechanical process of clinician programming is replaced with an automated electronic detection and control system. The magnetic field sensor continuously monitors the environment and triggers automatic mode switching through electronic control circuits, substituting the manual mechanical programming process with an automated sensing and response system
2Reliability
If manual programming is required for mode switching, then exposure mode can be activated, but clinician presence and procedural costs increase
Solution Approach 1:
The device performs preliminary detection of magnetic field conditions continuously before exposure mode is needed. The magnetic field sensor is always monitoring the environment, so when a magnetic disturbance occurs, the device is already prepared to immediately switch to exposure mode without waiting for clinician assessment or programming, thereby eliminating procedural delays
Solution Approach 2:
The device independently monitors magnetic field conditions and autonomously activates exposure mode without requiring clinician presence or intervention. This self-service capability eliminates the time loss associated with manual programming and ensures immediate response to magnetic disturbances
3Ease of operation
If the device automatically detects magnetic disturbances and switches modes, then human error and procedural costs are reduced, but device complexity increases
Solution Approach 1:
The magnetic field sensor serves multiple functions: it detects magnetic disturbances for mode switching, provides environmental monitoring data, and can potentially detect other magnetic field anomalies. This multi-functionality justifies the added complexity by providing versatile capabilities that benefit overall device operation and safety
Solution Approach 2:
The magnetic field sensor acts as an intermediary between the external magnetic environment and the device's control system. It translates physical magnetic field conditions into electrical signals that the control circuits can process, thereby enabling automatic mode switching while isolating the complexity of magnetic field detection from the operational control logic
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
Automated switching between modes ensures safer and more efficient operation during magnetic disturbances, reducing the risk of human error and procedural costs by enabling devices to automatically enter and exit exposure mode based on detected magnetic field levels.
Implementation Method 1
the implantable medical device periodically detects whether a magnetic field sensor is producing a first signal level that indicates a magnetic disturbance is present
Data Source
AI summary
Implantable medical devices automatically switch from a normal mode of operation to an exposure mode of operation and back to the normal mode of operation. The implantable medical devices may utilize hysteresis timers in order to determine if entry and/or exit criteria for the exposure mode are met. The implantable medical devices may utilize additional considerations for entry to the exposure mode such as a confirmation counter or a moving buffer of sensor values. The implantable medical devices may utilize additional considerations for exiting the exposure mode of operation and returning to the normal mode, such as total time in the exposure mode, patient position, and high voltage source charge time in the case of devices with defibrillation capabilities.