Implantable Device Motion Damping Layer Design
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Solution Overview
Problem
Implantable medical devices face challenges in reducing internal component motion, which can lead to interconnect problems and failures, while also requiring effective inspection and thermal management solutions.
Innovation Solution
The implementation of a motion dampening layer with varying thickness and voids over operational circuitry and battery components, including thermal isolation features and a waffled portion with reduced thermal conductivity, to minimize relative motion and enhance thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dampening layer is molded over the battery and operational circuitry to reduce relative motion, then device reliability is improved, but thermal management becomes more difficult
Solution Approach 1:
The dampening layer is designed with non-uniform thickness, being thicker in regions requiring enhanced motion dampening and thinner in regions requiring thermal management. This local variation allows different portions of the device to have optimized properties for their specific functional requirements.
Solution Approach 2:
The dampening layer is segmented into multiple regions with different thicknesses and properties. Some segments provide enhanced motion dampening while others provide thermal pathways, allowing the layer to serve multiple functions simultaneously without compromising either reliability or thermal management.
2Reliability
If the dampening layer is made thicker to improve motion dampening, then relative motion is reduced, but thermal isolation increases
Solution Approach 1:
The dampening layer thickness is locally optimized for each region. Thicker sections are placed where motion dampening is critical, while thinner sections are positioned where thermal dissipation is needed, allowing both functions to be performed effectively.
Solution Approach 2:
The solution moves from a uniform one-dimensional thickness to a three-dimensional variable thickness profile. This dimensional complexity allows the layer to provide both motion dampening and thermal management functions by varying thickness in different spatial locations.
3Temperature
If the dampening layer is made thinner to improve thermal management, then heat dissipation is enhanced, but motion dampening is reduced
Solution Approach 1:
Different regions of the dampening layer have different thicknesses optimized for their specific functions. Regions near heat-generating components are thinner to allow heat dissipation, while regions requiring vibration isolation are thicker to provide motion dampening.
4Difficulty of detecting and measuring
If a void is created in the dampening layer for residual gas analysis testing, then inspection capability is improved, but structural integrity is reduced
Solution Approach 1:
The dampening layer is segmented to include localized void regions for testing while maintaining continuous material in load-bearing areas. This segmentation allows inspection access without compromising the overall structural integrity of the layer.
Solution Approach 2:
The dampening layer incorporates controlled void spaces that function as testing access points. These voids are strategically positioned and sized to allow residual gas analysis while the surrounding material maintains structural strength.
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
This design reduces internal component motion, improves thermal isolation, and facilitates residual gas analysis, thereby increasing the reliability and durability of implantable medical devices.
Implementation Method 1
the dampening layer comprises a first void positioned over the header region of the battery to provide thermal isolation to the header region of the battery
Implementation Method 2
the dampening layer comprises a waffled portion defined by ridges and gaps therebetween, the waffled portion having a reduced thermal conductivity than at least one other portion of the dampening layer
Data Source
AI summary
Implantable medical devices are constructed with a dampening layer to limit motion of components inside a housing of the implantable medical devices. The dampening layer may have features to provide thermal isolation for certain components. The dampening layer may have features to allow mechanical vibration of selected components. The dampening layer may have features to ensure an air space exists to enable a residual gas analysis test.