Prosthetic Implant Caps for Force Distribution
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Solution Overview
Problem
Conventional orthopedic implants require expensive and exotic materials for biocompatibility and to withstand stresses in articulated joints, limiting material selection and increasing costs.
Innovation Solution
A prosthetic implant cap is designed using 3D printing to absorb and distribute forces at articulating skeletal interfaces, allowing for the use of alternative biocompatible materials that are not required to withstand the full range of stresses, such as titanium or cobalt chrome, which are stronger and more resilient than the implant itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive and exotic materials are used for prosthetic implants, then biocompatibility and stress resistance are improved, but cost and material selection flexibility deteriorate
Solution Approach 1:
The prosthetic implant is divided into two functional segments: a core implant structure made from cost-effective materials and a surface cap made from biocompatible materials. This segmentation allows each component to be optimized independently for its specific function, resolving the contradiction between material cost and biocompatibility requirements.
Solution Approach 2:
The invention uses a composite structure combining a base implant material (such as polymer, metal alloy, or ceramic) with a biocompatible surface cap material. This composite approach enables the implant to achieve both mechanical performance and biocompatibility without requiring the entire implant to be made from expensive exotic materials.
2Reliability
If biocompatible materials are used for prosthetic implants, then compatibility with skeletal structures is improved, but cost increases
Solution Approach 1:
Instead of making the entire implant from expensive biocompatible materials, the surface cap is applied locally only to the regions that require biocompatibility (articulating surfaces). This local quality approach reduces material costs while maintaining biocompatibility where it is most needed.
Solution Approach 2:
The surface cap serves as a protective layer that can be replaced if needed, allowing the use of less expensive base materials. The cap acts as a consumable component that interfaces with bone tissue, reducing the need for expensive materials in the permanent implant structure.
3Strength
If strong materials are used to withstand stresses in articulated joints, then force resistance is improved, but material cost and complexity increase
Solution Approach 1:
The implant is segmented into a structural core that provides mechanical strength and a surface cap that provides force resistance at articulation points. This allows the core to be made from materials optimized for structural integrity while the cap is optimized for withstanding contact forces and stresses.
Solution Approach 2:
The invention changes the material parameters locally by applying a surface cap with different mechanical properties than the base implant. The cap material is selected to have high compressive strength and wear resistance for withstanding articulation forces, while the base material can be lighter and less expensive.
Data Source
AI summary
A prosthetic implant surface cap adapted for securement to an interface region of the prosthetic defined by articulating prosthetic implants. 3D printing or additive manufacturing is employed to form the surface cap adapted for securement to an identified interface region, in which the interface region is defined by engaging contact with adjacent skeletal structures in response to patient movement. The surface cap is disposed on the implant surface to contact the adjacent skeletal structures during articulated movement, and is adhered to the interface region of the prosthetic implant for absorbing and distributing the contact and frictional forces of the articulating skeletal members.