Implantable Device Crosstalk Mitigation via Dynamic Sensing
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Solution Overview
Problem
Implantable medical devices, such as cardiac pacemakers and neurostimulators, experience interference or 'crosstalk' that can lead to mischaracterization of electrical stimulation signals as cardiac signals, causing inappropriate therapy delivery and affecting the accuracy of arrhythmia detection.
Innovation Solution
The system employs techniques to determine whether a therapy module is delivering electrical stimulation, adjusting sensing modes and parameters to differentiate between stimulation signals and cardiac signals, and modifying therapy programs to minimize interference, including switching between different therapy parameter sets to avoid mischaracterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical stimulation therapy is delivered by an implantable medical device, then therapeutic effect on target tissue is achieved, but crosstalk interference occurs that causes mischaracterization of stimulation signals as cardiac signals
Solution Approach 1:
The patent segments the sensing function into multiple independent sense modes with different sense vectors. By dividing the sensing capability into separate channels (e.g., bipolar vs. unipolar sensing, different electrode combinations), the system can selectively activate appropriate sense modes during stimulation therapy to avoid mischaracterizing stimulation signals as cardiac signals, thereby reducing crosstalk interference while maintaining reliable arrhythmia detection.
Solution Approach 2:
The patent implements dynamic switching between different sense modes based on the operational state of the therapy module. The system automatically adjusts sensing parameters in real-time: when stimulation is detected or anticipated, the controller switches to sense modes with vectors orthogonal to the stimulation current flow. This dynamic adaptation eliminates crosstalk interference during therapy delivery while preserving normal arrhythmia detection capabilities during non-stimulation periods.
2Object-generated harmful factors
If sensing parameters are adjusted to differentiate stimulation signals from cardiac signals, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The patent pre-configures multiple sense modes with different sense vectors during device programming and implantation. These sense modes are prepared in advance with known directional characteristics relative to potential stimulation currents. When stimulation therapy is initiated, the controller simply switches to the pre-defined sense mode that is orthogonal to the stimulation vector, eliminating the need for real-time complex calculations and reducing computational burden while effectively differentiating stimulation from cardiac signals.
Solution Approach 2:
The system employs automatic detection and switching logic that monitors therapy module operation and autonomously selects appropriate sense modes without requiring external intervention. The controller self-adjusts sensing parameters based on detected stimulation events, automatically switching between sense modes to maintain optimal discrimination between stimulation and cardiac signals. This self-service mechanism reduces the need for complex external programming and simplifies operational complexity.
Data Source
AI summary
Electrical crosstalk between two implantable medical devices or two different therapy modules of a common implantable medical device may be evaluated, and, in some examples, mitigated. In some examples, one of the implantable medical devices or therapy modules delivers electrical stimulation to a nonmyocardial tissue site or a nonvascular cardiac tissue site, and the other implantable medical device or therapy module delivers cardiac rhythm management therapy to a heart of the patient.