Hearing Aid Pullstring Adapter for Button Actuation
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Solution Overview
Problem
Modern hearing aids, particularly in ITC and CIC configurations, face challenges in minimizing surface area for push button controls and making them more accessible for easy operation.
Innovation Solution
A pushbutton pullstring adaptor with a housing and pullstring assembly that allows for both pushing and pulling forces to engage and disengage the pushbutton assembly, reducing the need for surface area and enhancing accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the hearing aid is made in ITC or CIC configuration with very small size, then the device fits better in the ear canal, but the surface area available for push button controls becomes insufficient
Solution Approach 1:
The patent extends the push button functionality along the longitudinal axis of the hearing aid by incorporating a pullstring mechanism that runs through the device body. This transforms the control interface from a two-dimensional surface constraint to a three-dimensional spatial arrangement, allowing the push button to be accessed from the distal end while the actuation mechanism extends toward the proximal end, effectively utilizing the limited internal volume of the hearing aid housing.
Solution Approach 2:
The pullstring assembly is nested within the hearing aid housing, with the string portion running through the device body and the engagement portion positioned adjacent to the push button assembly. This nested configuration allows the control mechanism to be compactly integrated into the small hearing aid volume without adding external bulk, maintaining the ITC/CIC form factor while providing functional control access.
2Ease of operation
If standard push buttons are used on small hearing aids, then the control function is provided, but the push buttons are difficult to access and operate
Solution Approach 1:
The pullstring serves as an intermediary element that transmits the user's pulling force from the accessible proximal end of the hearing aid to the push button assembly located at the distal end. This mediator mechanism allows users to operate the push button function without directly accessing the distal end of the device, significantly improving ease of operation for small ITC/CIC hearing aids where the distal end would be difficult to reach.
Solution Approach 2:
Instead of requiring the user to push the button directly at its location, the invention inverts the interaction by allowing the user to pull the string at a different location (proximal end) to achieve the same push button effect at the distal end. This inverted approach to force application makes the control much more accessible while maintaining the same control function.
3Reliability
If the engagement portion width is larger than the second aperture width, then the pushbutton assembly is securely engaged, but the string portion cannot pass through the second aperture
Solution Approach 1:
The housing aperture is designed with non-uniform cross-sectional dimensions: the first aperture (proximal end) has larger dimensions to accommodate the pullstring assembly, while the second aperture (distal end) has smaller dimensions optimized for its specific function. This local differentiation allows the engagement portion to be securely retained at the distal end while the thinner string portion can pass through both apertures during assembly and operation.
Solution Approach 2:
The pullstring assembly is segmented into distinct functional portions: the engagement portion with larger width for secure interaction with the push button assembly, and the string portion with smaller width for passage through the housing apertures. This segmentation allows each portion to be optimized for its specific function - secure engagement versus flexible passage - resolving the dimensional conflict between engagement security and aperture passage capability.
Data Source
AI summary
A pushbutton pullstring adaptor includes a pullstring and a housing enclosing a pushbutton. The pullstring includes an engagement portion and elongate string portion. The engagement portion, which is disposed within the housing, moves with respect to the housing to engage the pushbutton when a pushing force is applied and to engage the end of the housing when a pulling force is applied. One end of the string portion is securely attached to the engagement portion. The other end of the string portion passes through an aperture in the housing. The string portion moves freely through the aperture when a pushing force or pulling force is applied. When a pushing force is applied to the string portion, the engagement portion engages the pushbutton to control the hearing aid. When a pulling force is applied, the engagement portion engages the housing to remove the hearing aid from a user's ear.