Battery Retention Form for Implantable Medical Devices
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Solution Overview
Problem
Implantable medical devices face challenges in efficiently assembling components due to the need for space-efficient design and the expansion and contraction of rechargeable batteries, which can compromise mechanical and electrical connections unless adequately accounted for in the device design.
Innovation Solution
A form with a recess, ridge, and trough forming element is used to securely retain rechargeable batteries, allowing for expansion and contraction while preventing adhesive leakage and maintaining connection integrity, and also includes regions for retaining electronic circuitry and coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rechargeable batteries are used to reduce device size, then device volume is reduced, but battery expansion during recharging compromises mechanical and electrical connections
Solution Approach 1:
The form includes a flexible membrane that can expand and contract to accommodate battery volume changes during recharging cycles. This membrane maintains mechanical and electrical connections while adapting to battery expansion, preventing connection compromise despite the use of smaller rechargeable batteries.
Solution Approach 2:
The form incorporates dynamic elements including a flexible membrane and retention assembly that can adjust to battery expansion. The retention assembly includes movable components that maintain secure contact with the battery throughout expansion and contraction cycles, ensuring continuous reliable connections.
2Adaptability or versatility
If multiple components are retained in the housing to improve device functionality, then device complexity increases, but manufacturing time and cost increase
Solution Approach 1:
The form combines multiple retention functions into a single integrated component. It simultaneously retains the battery, electronic circuitry, and coils while providing adhesive application surfaces and mechanical retention features, reducing the number of separate assembly steps and components needed.
Solution Approach 2:
The form serves multiple functions: it acts as a retention structure for multiple components, provides adhesive application surfaces, accommodates battery expansion, and maintains electrical connections. This multi-functionality reduces overall device complexity while maintaining full functionality.
3Reliability
If adhesive is applied to secure battery in the housing, then battery retention is improved, but adhesive may leak into the recess compromising battery expansion space
Solution Approach 1:
The form acts as an intermediary structure between the battery and housing, providing a controlled interface for adhesive application. The form includes specific surfaces designed for adhesive application that are positioned to prevent leakage into the battery expansion recess, ensuring both secure retention and proper expansion space.
Data Source
AI summary
A form for retaining a battery in implantable medical device includes outer edge and first and second opposing major surfaces. The first major surface of the form includes a recess, a ridge disposed between the recess and the outer edge, and a trough forming element disposed between the ridge and the outer edge. The ridge is configured to engage at least a portion of a major surface of the battery retained in the form. The trough forming element has first and second edge surfaces positioned to engage an edge surface of the retained battery to form a trough configured to receive adhesive. The recess is disposed adjacent the ridge and is configured to allow for expansion of the retained battery during recharge. The retention assembly is configured to secure the first major surface of the battery against the ridge to prevent adhesive from leaking from the trough into the recess.