Implantable Stimulator Migration Control via Asymmetric Trapezoidal Housing
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Solution Overview
Problem
Existing implantable medical devices, such as cochlear implants, face challenges in preventing the migration of implantable components post-implantation, which can lead to unnecessary stress on electrode leads and potential damage to the device or surrounding tissue.
Innovation Solution
The implementation of a stimulator unit with a tapered, trapezoidal shape, designed to be implanted in a recessed area of the temporal bone, where guide posts and a recessed configuration help secure the device in place, preventing migration and ensuring stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stimulator unit is implanted in a recipient, then the device can provide therapeutic function, but the implantable component may migrate post-implantation causing stress on electrode leads and potential damage
Solution Approach 1:
The stimulator unit housing employs an asymmetric trapezoidal cross-sectional shape with a larger bottom surface area than top surface area. This asymmetric geometry provides superior resistance to impact forces and prevents migration by creating a stable fit within the implanted pocket, where the larger bottom surface resists upward migration forces while the smaller top surface accommodates external connections.
Solution Approach 2:
The housing dimensions are specifically configured with a bottom surface area that is 1.5 to 3 times larger than the top surface area. This parameter change in surface area ratio fundamentally alters the mechanical stability characteristics, providing adequate resistance to impact forces and preventing migration while maintaining proper fit within the implantation site.
2Stability of the object's composition
If the stimulator unit is secured firmly to prevent migration, then stability is improved, but the device complexity increases due to additional structural features
Solution Approach 1:
The housing is segmented into distinct functional zones: a larger bottom surface for stability and impact resistance, a smaller top surface for connections, and tapered side walls for smooth tissue integration. This segmentation allows each portion to serve its specific function optimally without requiring additional complex securing mechanisms.
Solution Approach 2:
The trapezoidal housing shape serves multiple functions simultaneously: it provides structural stability, resists impact forces, prevents migration, facilitates smooth tissue integration through tapered walls, and accommodates external connections at the top surface. This multi-functionality eliminates the need for separate securing components, reducing overall device complexity.
Data Source
AI summary
Devices and methods are disclosed for a stimulator unit in a medical device, such as an implantable component of a cochlear implant. In embodiments, the stimulator unit comprises a bottom wall configured to be substantially contacting a temporal bone of a recipient, and a top wall positioned opposite the bottom wall, wherein a cross section of the stimulator unit has an outer profile substantially parallel to the bottom wall and the top wall.