Leadless Biostimulator Electrode Switching for Low-Power Communication
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Solution Overview
Problem
Implantable leadless biostimulators face challenges in conserving power to extend battery life while maintaining effective conductive communication and therapeutic stimulation, as they often use the same electrodes for both functions, leading to inefficient energy use.
Innovation Solution
The use of a three-electrode configuration where the second electrode has a larger surface area in contact with patient tissue, allowing separate periods for stimulation and communication, with insulated and uninsulated portions to manage impedance, and a switch to alternate electrode sets for each function, along with low-frequency and high-frequency receivers to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same electrodes are used for both therapeutic stimulation and conductive communication, then device complexity is reduced, but power consumption increases and battery life decreases
Solution Approach 1:
The electrode system is segmented into multiple electrodes with different surface areas. The first electrode has a smaller surface area optimized for therapeutic stimulation, while the second electrode has a larger surface area optimized for conductive communication. This segmentation allows each electrode to be specialized for its intended function, reducing overall power consumption by using the appropriate electrode for each task.
Solution Approach 2:
The system dynamically switches between different electrode configurations based on the operational mode. A switch component selectively connects either the first electrode or the second electrode to the circuitry depending on whether therapeutic stimulation or conductive communication is being performed. This dynamic reconfiguration optimizes power consumption by matching electrode characteristics to functional requirements.
2Reliability
If the second electrode has a larger surface area for better conductive communication, then communication quality improves, but stimulation effectiveness during simultaneous use may be compromised
Solution Approach 1:
Different electrodes are designed with different local qualities - the first electrode has a smaller surface area with properties optimized for therapeutic stimulation, while the second electrode has a larger surface area with properties optimized for conductive communication. This local differentiation ensures that each electrode performs its specific function with high reliability without compromising the other function.
Solution Approach 2:
The switch component enables dynamic selection of which electrode to use based on the operational requirement. When conductive communication is needed, the larger surface area second electrode is selected for better signal quality. When therapeutic stimulation is needed, the first electrode is selected. This dynamic switching resolves the conflict between communication quality and stimulation effectiveness.
3Use of energy by moving object
If separate electrodes are used for stimulation and communication functions, then power consumption is optimized, but device complexity and electrode configuration becomes more complex
Solution Approach 1:
The biostimulator device is designed with multi-functionality, where the circuitry can operate with different electrode configurations depending on the mode. The same circuitry serves both therapeutic stimulation and conductive communication functions by selectively connecting to different electrodes. This universality allows power optimization through electrode specialization without requiring separate dedicated systems for each function.
Solution Approach 2:
The electrode system is segmented into multiple electrodes with different characteristics, and the switch component segments the electrical connections to selectively activate appropriate electrode pairs. This segmentation enables power optimization by using the most efficient electrode configuration for each function while maintaining manageable device complexity through systematic organization.
4Duration of action of stationary object
If a three-electrode configuration is used with separate electrode sets for different functions, then battery longevity is extended, but impedance management becomes more challenging
Solution Approach 1:
Each electrode is designed with specific local quality characteristics - the first electrode has a smaller surface area providing higher impedance suitable for therapeutic stimulation, while the second electrode has a larger surface area providing lower impedance suitable for conductive communication. The switch component manages impedance by selecting the appropriate electrode configuration for each operational mode, extending battery longevity while maintaining effective impedance control.
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 configuration enhances battery longevity and maintains effective conductive communication quality by optimizing electrode usage and reducing power consumption during specific functions.
Implementation Method 1
a conductive communication signal includes one or more conductive communication pulses that are transmitted through patient tissue from a transmitting device to a receiving device
Data Source
AI summary
Implantable leadless biostimulators and related methods are described. The implantable leadless biostimulator comprises first, second and third electrodes, and also includes circuitry configured to cause a first set of the electrodes, which includes the first electrode and the third electrode, but does not include the second electrode, to be used during first periods of time to deliver stimulation pulses to the patient tissue. The circuitry is also configured to cause a second set of the electrodes, which includes the second electrode and the third electrode, to be used during second periods of time to at least one of transmit conductive communication pulses to, or receive conductive communication pulses from, one or more other devices. The second set of electrodes optionally includes the first electrode electrically connected to the second electrode.