Hearing Device Impedance Monitoring for Wax Blockage Detection

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Solution Overview

Problem

Ear-worn hearing devices, particularly those with electro-acoustic output transducers, face performance deterioration due to ear wax blockage, which is difficult to detect and protect against, especially in children, as existing wax filters do not provide full protection.

Innovation Solution

A method involving the measurement and analysis of electrical impedance to evaluate the status of the output transducer and acoustical system, including tubing length and diameter, to automatically detect blockages and optimize acoustical performance by outputting status signals and adjusting operation parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wax filters are used to protect the loudspeaker, then protection from wax blocking is improved, but full protection is not achieved and device complexity increases

Engineering Contradiction:

Improveprotection from wax blockingVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces mechanical wax filters with an electrical monitoring system that measures impedance changes to detect wax blocking. This substitution eliminates the need for complex mechanical filter structures while achieving reliable detection of blocking conditions through electrical property changes of the loudspeaker coil.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The hearing device performs self-diagnosis by automatically monitoring its own loudspeaker impedance and detecting blocking conditions without requiring external intervention or complex additional components. The system serves itself by using its existing electrical circuitry to monitor its operational status.

Inventive Principle:

Principle #25Self-service

2Difficulty of detecting and measuring

If manual monitoring of loudspeaker performance is performed, then detection of wax blocking is possible, but user awareness is delayed especially in children who have difficulty noticing and communicating problems

Engineering Contradiction:

Improvedetection of wax blockingVSAvoiddetection time

Core Design Contradiction:

Difficulty of detecting and measuringVSLoss of time

Solution Approach 1:

The patent implements an automated feedback system that continuously monitors loudspeaker impedance and immediately detects changes indicating wax blocking. The system provides real-time feedback about device status without requiring user observation or communication, thereby eliminating detection delays associated with manual monitoring.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces manual visual or auditory inspection with automated electrical impedance measurement. This substitution enables continuous, objective monitoring that immediately detects blocking conditions without relying on user awareness or communication abilities.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If electrical impedance measurement is implemented for monitoring, then simple and efficient monitoring is achieved, but device complexity increases

Engineering Contradiction:

Improvemonitoring efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses the existing electrical circuitry of the hearing device for dual purposes: both for normal operation and for impedance measurement. By making the monitoring system multi-functional with existing components, the patent achieves efficient monitoring without proportionally increasing device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The hearing device uses its own electrical circuitry to perform self-monitoring through impedance measurement. This self-service approach enables efficient monitoring functionality while minimizing additional complexity, as the system leverages its existing structural and electrical components.

Inventive Principle:

Principle #25Self-service

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 simple and efficient monitoring and adjustment of hearing devices to immediately recognize wax blockages and optimize acoustical performance, ensuring proper functioning and reducing the need for manual adjustments.

Implementation Method 1

an electro-acoustic output transducer (loudspeaker) which is located in or at least close to the ear canal

Methodology Applied

Scientific EffectElectro-acoustic transduction:

Implementation Method 2

measuring an electrical impedance of said output transducer; analyzing the measured electrical impedance of the output transducer

Methodology Applied

Scientific EffectElectrical impedance measurement: Electrical Resistance

Data Source

PatentUS8467555B2Method for monitoring a hearing device and hearing device with self-monitoring function

Publication Date: 2013.06.18 SONOVA AG

AI summary

A method for monitoring a hearing device having an electroacoustic output transducer worn at a user's ear or in a user's ear canal, the method including: measuring the electrical impedance of the output transducer; analyzing the measured electrical impedance of the output transducer in order to determine at least one parameter from the length and diameter of tubing that extends into the user's ear canal and is connected to the transducer, and adjusting operation parameters of the hearing device based upon the results of the determination so as to optimize acoustical performance of the hearing device. A hearing device in which the method is implemented.