Implantable Device Site Stimulation for Patient Notification
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Solution Overview
Problem
Implantable medical devices face challenges in delivering effective patient notifications, especially when external programmers are not available or when electrode arrays are located in areas like the brain, where external notifications may not be perceivable.
Innovation Solution
The device delivers patient notification stimulation by configuring device site electrodes as cathodes and lead-borne electrode arrays as anodes, allowing for internal stimulation notifications that can be inhibited by the patient, with the option to resume at a different intensity or pattern, reducing power consumption and improving comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device site electrodes are used as cathodes for therapeutic stimulation, then therapeutic effect is achieved, but patient notification capability is reduced
Solution Approach 1:
The patent dynamically switches electrode configurations based on operational mode. During therapeutic stimulation, device site electrodes serve as cathodes; during notification, they become anodes while lead-borne electrodes switch roles. This dynamic reconfiguration allows the same hardware to serve multiple functions without compromising either therapeutic effectiveness or notification capability.
Solution Approach 2:
The system changes electrical parameters (polarity assignment) of existing electrodes to achieve different functions. By reversing the polarity roles of device site and lead-borne electrodes, the system transforms the electrode array from a therapeutic delivery configuration to a notification configuration, eliminating the need for separate electrode sets.
2Device complexity
If lead-borne electrode arrays are used for both therapeutic and notification stimulation, then device complexity is reduced, but unintended tissue activation occurs
Solution Approach 1:
The patent segments the electrode array into two distinct functional groups: device site electrodes and lead-borne electrodes. By assigning specific roles to each group based on location and function, the system prevents unintended tissue activation while maintaining configuration simplicity. The spatial separation and functional differentiation of these electrode segments allow selective activation appropriate to each stimulation type.
Solution Approach 2:
Different regions of the electrode system are assigned different qualities and functions. Device site electrodes (proximal to implant) are optimized for notification when configured as anodes, while lead-borne electrodes (distal, near target tissue) are optimized for therapeutic delivery when configured as cathodes. This local quality assignment prevents harmful cross-activation while utilizing the same physical infrastructure.
3Reliability
If notification stimulation is delivered continuously, then patient awareness is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic notification stimulation rather than continuous delivery. The system activates notification stimulation at specific intervals or in response to specific events, allowing the battery to conserve energy during non-notification periods while maintaining reliable patient awareness when needed. This periodic approach balances notification reliability with power conservation.
Solution Approach 2:
The system dynamically adjusts notification stimulation parameters (amplitude, duration, frequency) based on battery status and notification urgency. When battery power is充足, more frequent or intense notifications can be delivered; when power is low, the system reduces notification intensity or frequency, extending battery life while maintaining essential patient awareness.
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 method enables reliable patient notification even when external programmers are unavailable, reduces unintended tissue activation, and conserves battery life by allowing patients to control notification intensity and frequency.
Implementation Method 1
the IMD delivers stimulation via an electrode configuration in which the one or more cathodes are device site electrodes, and the one or more anodes are within the lead-borne electrode array
Data Source
AI summary
The disclosure is directed to techniques for delivering electrical stimulation for patient notification. An implantable medical device (IMD) may deliver patient notification stimulation via one or more device site electrodes, e.g., electrodes located proximate to an implant site for the IMD, configured as cathodes. Anodes for delivery the patient notification stimulation may be located in an electrode array that is provided by one or more leads and located distally from the implant site, e.g., an electrode array located at one or more target sites for delivery of stimulation therapy. In some embodiments, the IMD may inhibit the patient notification stimulation for a period in response to input from the patient, and then resume the stimulation at the end of the period. In this manner, the notification stimulation may be “snoozed” like an alarm clock. When the stimulation resumes, it may be different, e.g., more urgent, then prior to inhibition.