Tissue Conductive Communication Dipole Selection for Implantable Devices
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Solution Overview
Problem
Existing implantable medical device (IMD) systems face challenges in wireless communication due to rapid signal attenuation when deeply implanted, as traditional RF telemetry is hindered by thick body tissues, leading to inefficient communication and battery constraints in smaller devices.
Innovation Solution
The implementation of tissue conductive communication (TCC) techniques that select optimal dipoles formed by electrodes at different tissue contact points to achieve reliable signal transmission at lower signal strengths, allowing for identification of suitable external devices for specific implant scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RF telemetry is used for communication with deeply implanted IMDs, then communication can be established, but signal attenuation is rapid and requires strong transmit signals which consume excessive battery power
Solution Approach 1:
The patent changes the fundamental communication parameter from RF telemetry to tissue conductive communication (TCC), utilizing the body's natural electrical conductivity through tissue rather than electromagnetic radiation. This parameter change enables reliable communication with deeply implanted devices while operating at lower signal strengths, thereby reducing battery power consumption.
Solution Approach 2:
The patent replaces the electromagnetic field-based RF telemetry system with an electrical conduction-based TCC system. By substituting the communication mechanism to utilize ionic conduction through body tissues rather than electromagnetic waves, the system achieves reliable deep-implant communication with reduced energy requirements.
2Reliability
If transmit device transmits strong signal to overcome tissue attenuation, then communication reliability improves, but battery capacity is depleted faster
Solution Approach 1:
The patent fundamentally changes the signal transmission parameter from high-power RF electromagnetic waves to low-power electrical signals conducted through tissue. This parameter change allows maintaining communication reliability while extending battery life by operating at significantly lower power levels.
Solution Approach 2:
The patent introduces body tissue as an intermediary medium for signal transmission. Instead of transmitting signals through air or vacuum as in RF telemetry, the system uses the body's conductive tissue as the transmission medium, enabling efficient signal propagation to deeply implanted devices without requiring high transmit power.
3Reliability
If multiple dipoles are tested to find optimal configuration, then signal quality improves, but communication setup time increases
Solution Approach 1:
The patent performs preliminary testing of multiple dipole configurations during the initial setup phase to identify the optimal electrode pair for each patient's anatomy. By conducting this dipole selection process in advance, the system establishes the best communication path before actual use, ensuring high signal quality without requiring repeated testing during clinical operation.
Solution Approach 2:
The system performs self-configuration by automatically testing and selecting the optimal dipole configuration without requiring manual intervention. The IMD and external device work together to identify the best electrode pairs, storing this information for future use, thereby eliminating the need for repeated manual optimization while maintaining high signal quality.
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
Enables reliable and efficient communication between IMDs and external devices by optimizing signal quality through the selection of appropriate dipoles, reducing power consumption and extending battery life in smaller IMDs.
Implementation Method 1
tissue conductive communication (TCC)... communicate with an implantable medical device via a plurality of dipoles formed by different combinations of the electrodes
Data Source
AI summary
Aspects of the present disclosure include a medical device system including an implantable medical device and an external device with three or more electrodes configured to contact a patient's skin. The external device either transmits or receives a test signal to or from the implantable medical device using a plurality of possible receive dipoles, where each possible receive dipole is formed by a pair of electrodes. A signal quality monitor, either at the implantable medical device or at the external device, measures a signal quality for the possible receive dipoles.