Charging Coil Telemetry for Implantable Device Error Reporting
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Solution Overview
Problem
Implantable medical devices, such as spinal cord stimulation systems, face challenges in reporting error conditions externally when traditional telemetry techniques fail due to fundamental errors during initialization or operation, leading to potential explantation of the device without knowing the specific error, which is inconvenient and costly.
Innovation Solution
The implementation of robust error modulation circuitry that uses the charging coil to transmit error data to an external charger, bypassing traditional telemetry methods, allowing for passive and continuous error reporting even when the device's initialization or communication circuitry is compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional telemetry techniques are used to report error conditions, then communication capability is maintained under normal operation, but error reporting fails when fundamental errors occur during initialization or operation
Solution Approach 1:
The charging coil is designed to serve dual purposes: traditional power transfer function and error condition reporting function. By making the charging coil multi-functional, the system can report errors through a component that already exists, eliminating the need for separate dedicated error reporting hardware and improving reliability without proportionally increasing complexity
Solution Approach 2:
The charging coil acts as an intermediary medium for error reporting. Instead of relying on the traditional telemetry coil which may fail during fundamental errors, the error modulation circuitry uses the charging coil as an alternative communication pathway, mediating the transmission of error information from the implantable device to the external charger
2Reliability
If the device uses dedicated error reporting circuitry, then error detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The charging coil is designed to serve dual purposes: traditional power transfer function and error condition reporting function. By making the charging coil multi-functional, the system can report errors through a component that already exists, eliminating the need for separate dedicated error reporting hardware and improving reliability without proportionally increasing complexity
Solution Approach 2:
The error modulation circuitry changes the electrical parameters (impedance, frequency) of the charging coil to encode error information. By modulating the charging coil's parameters based on detected error conditions, the system transforms the coil from a simple power transfer component into an active communication channel without adding substantial hardware complexity
3Measurement precision
If the device requires explantation to determine error cause, then diagnostic accuracy is maximized, but patient convenience and device retention are reduced
Solution Approach 1:
The error modulation circuitry continuously monitors system state and proactively reports error conditions before they require explantation. By detecting and transmitting error information through the charging coil during normal operation, the system performs preliminary diagnostics that eliminate the need for invasive explantation procedures, maintaining diagnostic accuracy while preserving patient convenience
Solution Approach 2:
The system establishes a feedback loop where error conditions are detected by the error modulation circuitry and continuously reported to the external charger. This real-time feedback mechanism allows clinicians to diagnose issues remotely without requiring device removal, maintaining measurement precision while dramatically improving ease of operation and patient comfort
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 external detection and analysis of failure modes, facilitating corrective actions without explantation, improving device reliability and reducing the complexity of failure analysis for manufacturers.
Implementation Method 1
uses the charging coil to transmit error data to an external charger
Data Source
AI summary
The disclosed techniques allow for externalizing errors from an implantable medical device using the device's charging coil, for receipt at an external charger or other external device. Transmission of errors in this manner is particularly useful when telemetry of error codes through a traditional telemetry coil in the implant is not possible, for example, because the error experienced is so fundamental as to preclude use of such traditional means. By externalizing the error via the charging coil, and though the use of robust error modulation circuitry in the implant designed to be generally insensitive to fundamental errors, the external charger can be consulted to understand the failure mode involved, and to take appropriate action.