Actuator Impedance Monitoring for Hearing Prosthesis Stability
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Solution Overview
Problem
Existing hearing prostheses, particularly mechanical stimulating devices, face challenges in accurately determining the stability and state of actuators, which affects the delivery of mechanical stimulation to recipients, leading to potential instability or detachment issues.
Innovation Solution
The method involves measuring the impedance of actuators in hearing prostheses using a shunt component to determine changes in electrical properties, allowing for the identification of actuator characteristics, behavior, or state by analyzing frequency responses and comparing impedance data against thresholds or previous data points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hearing aids are used for conductive hearing loss, then hearing amplification is provided, but sufficient benefit is not derived due to instability and detachment issues
Solution Approach 1:
The patent implements feedback by measuring electrical properties (impedance, voltage) of the actuator and using these measurements to determine system characteristics such as coupling status, stability, and detachment. The control circuit continuously monitors actuator performance and uses this feedback information to assess whether the actuator is properly coupled to the skull or has become detached, enabling real-time detection and response to instability conditions.
Solution Approach 2:
The patent replaces direct mechanical monitoring of actuator-st skull coupling with electrical measurements. Instead of mechanically detecting detachment or instability, the system uses electrical impedance and voltage measurements across the actuator to infer mechanical coupling status. This substitution allows for non-invasive, continuous monitoring of system characteristics through electrical property changes that correlate with mechanical attachment state.
2Reliability
If actuator impedance is measured to detect detachment, then reliability is improved, but device complexity increases due to additional measurement circuitry
Solution Approach 1:
The patent makes the measurement circuitry multi-functional by using the same electrical measurement system for multiple purposes: driving the actuator, measuring impedance to detect detachment, assessing coupling characteristics, and monitoring overall system stability. The control circuit performs both actuator control and diagnostic measurement functions, eliminating the need for separate dedicated detection hardware and reducing overall device complexity despite the added diagnostic capability.
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 approach enhances the accuracy of mechanical stimulation delivery by detecting instability or detachment of actuators, enabling real-time adjustments and improving the overall performance and safety of the hearing prosthesis.
Implementation Method 1
determining a change in an actuator impedance based on a change in an electrical property of a system of which the actuator is apart
Implementation Method 2
an actuator, a signal generator configured to provide a signal to the actuator to cause actuation of the actuator
Data Source
AI summary
A method, including determining a change in an actuator impedance based on a change in an electrical property of a system of which the actuator is apart, and determining one or more system characteristics based on the change in the actuator impedance.