Filter Capacitor Insulation Layout for Hermetic High-Voltage Implants
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Solution Overview
Problem
Existing implantable medical devices face challenges in maintaining hermeticity, particularly with polymeric materials that age and allow moisture permeation, leading to potential device failure and corrosion due to high permeation rates, which can be catastrophic for patients.
Innovation Solution
Incorporation of nano-scale metal oxide insulating powders into insulation materials to enhance dielectric breakdown strength, preventing microcoulomb discharges and increasing stand-off voltage, thereby ensuring hermeticity and preventing electrical failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymeric insulating materials are used in implantable medical devices, then ease of manufacture and flexibility are improved, but moisture permeation and aging lead to hermeticity failure over time
Solution Approach 1:
The patent applies composite materials by combining polymeric insulating materials with nanoscale metal oxide particles (such as alumina, silica, or titania) to create a hybrid material system. The nanoscale particles are dispersed within the polymeric matrix to form a composite that maintains the flexibility and ease of manufacturing of polymers while adding moisture barrier properties and improved dielectric strength from the inorganic nanoparticles. This composite structure resolves the contradiction by allowing the polymeric base material to provide manufacturability while the nanoscale reinforcements provide long-term hermeticity.
Solution Approach 2:
The patent employs parameter changes by modifying the physical and chemical properties of the insulating material through the addition of nanoscale metal oxide particles. Specifically, the composite material achieves altered moisture permeation characteristics, enhanced dielectric breakdown strength, and improved aging resistance compared to pure polymeric materials. The nanoscale particles create tortuous pathways for moisture diffusion and provide cross-linking sites that reduce polymer chain mobility, thereby changing the material's permeation and degradation parameters to maintain hermeticity over time.
2Reliability
If insulation material thickness is increased to prevent microcoulomb discharges, then electrical safety is improved, but device size and complexity increase
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the dielectric properties of the insulation material through nanoscale metal oxide particle incorporation. The composite material achieves significantly enhanced dielectric breakdown strength, allowing thinner insulation layers to provide the same or greater electrical safety margin. This parameter modification enables the use of reduced insulation thickness while maintaining or improving electrical safety, thereby avoiding the need for increased device size or complexity.
Solution Approach 2:
The patent utilizes porous or nanostructured materials by incorporating nanoscale metal oxide particles that create a refined internal structure within the polymeric matrix. This nanostructured composite provides enhanced electrical insulation properties and dielectric strength per unit thickness compared to conventional homogeneous polymers. The nanoscale architecture creates multiple interfaces and tortuous pathways that impede electrical breakdown, allowing thinner effective insulation while maintaining safety margins.
3Strength
If nano-scale metal oxide powders are added to insulation material, then dielectric breakdown strength is enhanced, but manufacturing precision and material homogeneity become more difficult to control
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration, size distribution, and surface treatment of nanoscale metal oxide particles to optimize dispersion within the polymeric matrix. By adjusting parameters such as particle surface chemistry, mixing speed, temperature, and processing time, the patent achieves uniform distribution of nanoscale particles that enhances dielectric breakdown strength while maintaining material homogeneity. The controlled parameter approach prevents particle aggregation and ensures consistent composite material properties throughout the insulation component.
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 addition of nano-scale metal oxide powders significantly enhances the dielectric breakdown strength, reducing the risk of electrical failures and ensuring long-term hermeticity, thus ensuring the reliability and safety of implantable medical devices.
Implementation Method 1
the novel addition of nano-scale metal oxide or polymeric insulating powders to the insulation material. In general, the present invention teaches increasing the high-voltage dielectric breakdown strength of all the aforementioned AIMD parts and subassemblies
Data Source
AI summary
The high-voltage and/or high-frequency pulse dielectric breakdown strength (DBS) of an implantable medical device is increased by strategically positioning insulation materials on or adjacent to the external surfaces of a filter capacitor. Dielectric breakdown strength is further increased by adding polymeric or ceramic nanoscale metal oxide insulative powders to the insulation materials.