Flexible Circuit Assembly for Implantable Medical Device
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Solution Overview
Problem
Existing methods for assembling implantable medical devices (IMDs) with components mounted to the interior surface of the housing face challenges in maintaining a top-down assembly process while ensuring reliable electrical connections, particularly when components like piezoelectric transducers are mounted directly to the housing interior.
Innovation Solution
The use of flexible circuits with elongated extender portions and connectors that allow for flexible and reliable electrical connections between components mounted to the interior surface and the hybrid circuit, minimizing strain and ensuring consistent routing during the closure of the housing, while maintaining a compact and efficient geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components are mounted to the interior surface of the housing, then the device can achieve improved functionality (e.g., piezoelectric transducer for patient alerts), but the assembly process becomes more complex and difficult to maintain as a top-down assembly method
Solution Approach 1:
The flexible circuit is segmented into distinct functional portions: a first portion that mounts to the interior housing surface with components, a second portion that interfaces with the hybrid circuit, and an extender portion that bridges between them. This segmentation allows each portion to be optimized for its specific function while maintaining overall assembly simplicity through the top-down approach.
Solution Approach 2:
The extender portion of the flexible circuit acts as an intermediary element between the component-mounted first portion and the hybrid circuit interface second portion. This intermediary structure facilitates the transmission of electrical signals while accommodating the spatial separation required for interior surface mounting, thereby enabling complex functionality without complicating the assembly process.
2Adaptability or versatility
If components are mounted to the interior surface of the housing, then device functionality is improved, but ensuring reliable electrical connections becomes more difficult
Solution Approach 1:
The flexible circuit utilizes a thin film structure that can be reliably mounted to the interior housing surface while maintaining flexible electrical connections. This thin film approach allows the circuit to conform to the housing interior geometry and ensures reliable electrical pathways from components mounted on the housing surface to the hybrid circuit, overcoming the challenges of interior surface mounting.
3Productivity
If a top-down assembly method is maintained, then manufacturing efficiency is preserved, but components mounted to the interior surface cannot be easily integrated
Solution Approach 1:
The flexible circuit is prepared in advance with components mounted to the first portion before insertion into the housing. This preliminary action allows component integration to occur prior to the top-down assembly process, enabling interior surface mounting while maintaining manufacturing efficiency. The pre-prepared flexible circuit is then inserted as a complete unit during the top-down assembly, preserving productivity.
Solution Approach 2:
The flexible circuit extends in multiple dimensions within the housing: the first portion mounts to the interior surface in one dimension, the extender portion bridges through another dimension, and the second portion interfaces with the hybrid circuit in a third dimension. This multi-dimensional arrangement enables component integration while maintaining the simplicity of the top-down assembly method.
Data Source
AI summary
An implantable medical device (IMD) having a hermetic housing formed from a case and a cover each having an exterior surface and an interior surface. An IMD component is mounted to the interior surface of the cover and has an electrical contact. A hybrid circuit is assembled in the case. The IMD component electrical contact is electrically coupled to the to the hybrid circuit assembled in the case.