Cochlear Implant Capacitor Status Measurement
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Solution Overview
Problem
Current cochlear implant systems lack a reliable method to assess the status of DC blocking capacitors, which are crucial for ensuring electrical safety and preventing unbalanced stimulation that can lead to tissue damage, as failures such as shorted or leaky capacitors compromise the safety of patients.
Innovation Solution
A cochlear implant system with an external unit processing acoustical sound into coded audio signals and an implantable unit generating electrical pulses of varying durations, where a measurement unit assesses the voltage differences across electrodes and capacitors to determine capacitor status, allowing for identification of shorted or leaky capacitors and evaluating circuitry failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If DC blocking capacitors are used to ensure charge balancing and patient safety, then electrical safety is improved, but the reliability deteriorates because capacitor failures (shorted or leaky) cannot be detected
Solution Approach 1:
The system performs preliminary diagnostic actions by applying test voltage pulses to the capacitor before normal operation to detect potential failures. The measurement unit applies a first voltage pulse and measures the resulting current, then applies a second voltage pulse with different characteristics and measures again, allowing detection of capacitor degradation before it causes safety issues.
Solution Approach 2:
The system implements feedback by continuously monitoring the capacitor's electrical characteristics through repeated measurements. The control unit compares measured values against expected ranges and can trigger alerts or adjust operation when degradation is detected, creating a closed-loop safety system that adapts to capacitor aging.
2Ease of operation
If self-check circuitry is implemented in the implant to measure voltages, then ease of operation is improved, but the measurement precision deteriorates because existing ADC circuitry is not optimized for capacitor diagnostics
Solution Approach 1:
The system changes measurement parameters by applying multiple different voltage pulses (different amplitudes, durations, or waveforms) to the capacitor and measuring the resulting currents. By varying these parameters and analyzing the responses, the system can extract precise information about capacitor health that would not be obtainable with a single fixed measurement.
Solution Approach 2:
The system introduces an intermediary measurement approach by using the existing electrode and telemetry infrastructure as mediators. Rather than requiring direct access to the capacitor, the system measures electrical characteristics through the electrode-telemetry pathway, leveraging existing components for diagnostic purposes.
3Ease of operation
If the implant is made completely inaccessible to avoid surgical intervention, then ease of operation is improved, but the ease of repair deteriorates because failed capacitors cannot be replaced
Solution Approach 1:
The system implements self-service by providing built-in diagnostic capabilities that allow the implant to monitor its own capacitor health and communicate status to external devices. The measurement unit and telemetry system enable the implant to perform self-diagnostics and alert clinicians to issues without requiring surgical access for routine monitoring.
Solution Approach 2:
The system takes preliminary action by detecting capacitor degradation early through continuous monitoring, allowing for planned replacement before complete failure occurs. This proactive approach enables scheduling of elective surgical interventions rather than emergency repairs, improving overall system reliability and patient safety.
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 solution enables reliable assessment and identification of capacitor failures, ensuring patient safety by accurately determining the status of capacitors and maintaining balanced electrical stimulation, thereby preventing tissue damage.
Implementation Method 1
a capacitor (632) connected to the at least one electrode (633c). The system still further comprises a measurement unit (634) configured to measure, across the connection of the at least one electrode (633c) and the capacitor (632), a first voltage based on the first electrical pulse and a second voltage based on the second electrical pulse
Data Source
AI summary
A cochlear implant system is disclosed. The system includes an external unit configured to receive acoustical sound and process the acoustical sound into a coded audio signal, and an implantable unit configured to receive the coded audio signal. The system further comprises a pulse generating unit configured to generate a first electrical pulse of a first pulse duration and a second electrical pulse of a second pulse duration different from the first pulse duration based on the coded audio signal.