Implantable Medical Device Override Mode for Magnetic Interference
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Solution Overview
Problem
Current implantable medical devices (IMDs) lack an effective method to override false magnetic inputs, such as those from MRI or other strong magnetic fields, which can inadvertently inhibit or alter neurostimulation therapy.
Innovation Solution
An IMD with a sensor to detect magnetic fields and an interface for receiving an override signal, allowing the device to enter an override mode and block predetermined responses to magnetic inputs, ensuring continuous neurostimulation therapy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IMD responds to magnetic inputs by inhibiting or altering neurostimulation therapy, then the device protects itself from potential interference, but false magnetic inputs (e.g., from MRI) can inadvertently cause therapy interruption
Solution Approach 1:
The patent applies preliminary anti-action by implementing an override mode that preemptively counteracts the harmful effect of false magnetic inputs. When magnetic field detection indicates a potential false input (such as during MRI procedures), the override mode activates to prevent the predetermined inhibitory response, thereby maintaining therapy continuity despite the presence of external magnetic fields.
Solution Approach 2:
The patent introduces an intermediary mechanism (the override mode controlled by a magnetometer and processor) that mediates between the magnetic field detection and the neurostimulation therapy delivery. This intermediary layer allows the device to distinguish between intentional magnetic inputs (from magnets placed on the patient) and false inputs (from MRI equipment), enabling selective suppression of the predetermined response only when appropriate.
2Ease of operation
If the IMD uses magnetic field detection to control operation mode, then the device can respond to patient-initiated signals, but it becomes vulnerable to external magnetic field interference
Solution Approach 1:
The patent applies local quality by creating different operational states (normal mode vs. override mode) with distinct response characteristics to magnetic inputs. In normal mode, the device responds to magnetic inputs by inhibiting or altering therapy. In override mode, the device suppresses this predetermined response. The system dynamically switches between these local operational qualities based on the detected magnetic field characteristics and duration.
Solution Approach 2:
The patent implements dynamics by making the device's response to magnetic inputs adjustable and context-dependent rather than fixed. The override mode allows the system to dynamically change its behavior based on the situation, transitioning from a responsive state (where magnetic inputs trigger therapy modification) to a resistant state (where magnetic inputs are ignored). This dynamic adaptability resolves the contradiction between responsiveness and stability.
3Reliability
If the IMD enters override mode to block predetermined responses, then false magnetic inputs are ignored, but the device requires additional control mechanisms
Solution Approach 1:
The patent applies universality by designing the override mode control system to serve multiple functions: it can be activated by specific magnetic field patterns, by patient-initiated signals through the user interface, or by programmed conditions. The same override mechanism that blocks false magnetic inputs during MRI can also be used for other therapeutic purposes, reducing the need for separate control systems and minimizing added complexity.
Solution Approach 2:
The patent implements self-service by enabling the device to automatically detect when it should enter override mode based on magnetic field characteristics and duration, without requiring constant external programming or manual intervention. The processor analyzes the detected magnetic field signals and autonomously determines when to activate the override mode, making the system self-regulating and reducing the burden on external control mechanisms.
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 effectively prevents false interruptions of IMD operations due to external magnetic fields, maintaining normal stimulation delivery even in areas with significant magnetic activity.
Implementation Method 1
a magnetometer to detect a magnetic field generated by an external source
Data Source
AI summary
A method and apparatus for providing an override of an operational mode of an implantable medical device. An override input to enter an override mode is received. A determination as to whether a magnetic input has been received is made. A predetermined response to the magnetic input is blocked in response to receiving the override input.