Implant Probe Two-Wire Communication for Electrode and Sensor Control
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Solution Overview
Problem
Managing multiple electrodes and sensors in active implantable medical devices, particularly in cardiac resynchronization therapy devices, is challenging due to complex electrode placement and the risk of inappropriate stimulation, especially with the proximity of the phrenic nerve and the difficulty in calibrating coded selection/configuration signals to avoid cardiac tissue depolarization.
Innovation Solution
A system that globally manages all configurations of probes, electrodes, and sensors connected to a single generator using a two-wire bus for digital signals, stimulation pulses, and analog collection signals, with a communication protocol that includes micropulses and a comparator to control switches and ensure safe data exchange without modifying the generator hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple electrodes and sensors are integrated into the probe for cardiac resynchronization therapy, then the adaptability and therapeutic effectiveness are improved, but the device complexity and risk of inappropriate stimulation increase
Solution Approach 1:
The probe is segmented into multiple independent electrodes (first electrode, second electrode, third electrode, fourth electrode) that can be independently controlled and activated. This segmentation allows the system to selectively stimulate specific cardiac regions while avoiding the phrenic nerve, thereby improving adaptability without proportionally increasing overall system complexity.
Solution Approach 2:
The probe integrates multiple functions into a single device: it can perform cardiac resynchronization therapy through multiple electrodes, sense cardiac electrical activity through sensors, and selectively activate different electrode configurations based on real-time conditions. This multi-functionality improves versatility while consolidating control mechanisms.
2Ease of operation
If coded selection/configuration signals are used to control electrode selection, then the ease of operation is improved, but the risk of inappropriate cardiac tissue depolarization increases
Solution Approach 1:
A sensor acts as an intermediary between the control system and the electrodes. The sensor continuously monitors cardiac electrical activity and provides real-time feedback to the control system, which then makes informed decisions about electrode activation. This intermediary mechanism ensures that coded selection signals only trigger electrode activation when appropriate, reducing the risk of inappropriate depolarization while maintaining ease of operation.
Solution Approach 2:
The system incorporates feedback loops where sensors detect cardiac electrical signals and feed this information back to the control system. The control system uses this feedback to dynamically adjust electrode selection and stimulation parameters, ensuring that coded commands result in appropriate therapeutic effects rather than harmful depolarization.
3Reliability
If the probe is introduced into the coronary sinus for left ventricle access, then the therapeutic effectiveness is improved, but the difficulty of implantation and calibration increases
Solution Approach 1:
The probe is pre-configured with multiple electrodes and sensors in specific spatial arrangements before implantation. The control system is pre-programmed with algorithms to automatically identify optimal electrode configurations based on sensor feedback. This preliminary preparation reduces the complexity and difficulty of the implantation procedure while ensuring effective left ventricle stimulation.
Data Source
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AI summary
A probe (14) is connected proximally to a generator (10) and has electrodes (38, 42) distally adapted to make contact with surrounding tissues. A two-wire connection (34, 36) links these electrodes to the generator. The probe incorporates sensor or actuator-type transducers (24, 26). The generator includes digital data transmission and reception means (46, 48, 50, 54, 56) capable of generating commands for one of the transducers and of receiving and decoding information emitted by one of the transducers in response to a specific command generated by the generator. The transducer includes means for receiving, decoding, and executing commands, as well as means for transmitting information in response.