Implantable Device Encapsulant with Reduced Thermal Mass
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Solution Overview
Problem
Existing implantable medical devices face challenges in thermal management and component protection due to the heating effects of traditional dampening layers during manufacturing, which can damage sensitive components and increase aging or vulnerability to other forms of damage.
Innovation Solution
A method involving a dampening layer composed of a thermoplastic or elastomer material mixed with a second material such as Zeolites, ceramic, or carbon fibers, which reduces heat capacity and thermal conductivity, and may include entrapped gas to minimize thermal impact on components, ensuring effective motion control and reduced mass of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a traditional dampening layer is used to secure electrical components, then motion control is improved, but thermal effects increase causing component damage and aging
Solution Approach 1:
The dampening layer is constructed as a composite material combining a polymer matrix (providing motion control and damping) with thermally conductive filler particles (such as aluminum oxide, aluminum nitride, or boron nitride). This composite structure enables the layer to simultaneously provide mechanical stabilization and thermal management, dissipating heat away from sensitive electronic components while maintaining their fixed positions.
Solution Approach 2:
The invention modifies the thermal parameters of the dampening layer by incorporating filler materials with high thermal conductivity. This changes the thermal conductivity parameter of the overall dampening layer from that of a standard polymer (low thermal conductivity) to a composite material with enhanced thermal conductivity, enabling effective heat dissipation while retaining the motion control properties of the polymer matrix.
2Stability of the object's composition
If a dampening layer is placed over components, then motion control is improved, but device mass increases
Solution Approach 1:
The dampening layer is selectively applied only where motion control is needed, rather than uniformly across the entire device. The layer can be positioned specifically around sensitive components that require stabilization, while leaving other areas without this additional mass. This localized approach provides necessary motion control while minimizing the overall mass increase of the implantable device.
3Object-affected harmful factors
If filler material is added to reduce heat capacity, then thermal effects are reduced, but manufacturing complexity increases
Solution Approach 1:
The dampening layer incorporates a porous structure with entrapped gas pockets distributed throughout the polymer matrix. This porous architecture reduces the effective heat capacity and thermal conductivity of the dampening layer while maintaining its structural integrity and motion control properties. The gas-filled pores act as thermal insulators and reduce the overall heat capacity without requiring complex manufacturing processes, as the porosity can be introduced through standard foam formation or aeration techniques during polymer processing.
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
The solution effectively reduces thermal conductivity and heat capacity of the dampening layer, minimizing damage to components and reducing the overall mass of the medical device, while providing adequate motion control and thermal isolation, thus enhancing the reliability and performance of implantable medical devices.
Implementation Method 1
the second material reduces a heat capacity of the dampening layer by at least 10%, relative to a heat capacity of the first material
Implementation Method 2
the second material reduces a thermal conductivity of the dampening layer by at least 10%, relative to a thermal conductivity of the first material
Implementation Method 3
The dampening layer can act as a dielectric while also providing motion control
Implementation Method 4
providing adequate motion control and thermal isolation
Implementation Method 5
the dampening layer has a density that is reduced by at least 10% relative to a density of the first material
Implementation Method 6
the filler material and/or injected gas also reduces the mass of the dampening layer
Data Source
AI summary
Implantable medical devices with a dampening layer, and methods for manufacturing such devices. A dampening layer may be dispensed onto assembled electrical components of an implantable medical device. The dampening layer may include a first material which is modified with a second material to reduce one or more of the heat capacity or density thereof.