Resilient Interpositional Arthroplasty Implant for Joint Repair
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Solution Overview
Problem
Current arthroplasty techniques using rigid plastic and metal implants for joint replacement often fail due to loosening, infection, or wear, and do not effectively address the degradation of joint function caused by inflammatory enzymes, leading to limited durability and success, especially in ankle joint replacements.
Innovation Solution
A resilient orthopedic implant configured as a balloon with variable attachment connections and anatomic design symmetry, capable of molding to surrounding structures, providing shock absorption and delivering regenerative cells to restore joint integrity and function, while avoiding extrusion or dislocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid plastic and metal implants are used for joint replacement, then structural strength is improved, but durability and reliability deteriorate due to loosening, infection, or wear
Solution Approach 1:
The patent changes the physical state and mechanical properties of the implant material from rigid (metal and plastic) to resilient and compliant. The implant is made of a resilient material that can deform and absorb shock, fundamentally altering the parameter of rigidity to improve durability and reduce wear while maintaining sufficient structural strength to support joint loads.
Solution Approach 2:
The patent employs a composite structure combining a resilient outer material with an inner filler material. The resilient material provides structural integrity and shock absorption, while the inner filler (such as cement or bone graft) provides anchorage and integration with surrounding bone tissue, creating a composite system that achieves both strength and reliability.
2Strength
If rigid implants are used to replace damaged joint surfaces, then immediate structural support is improved, but adaptability to joint motion and shock absorption deteriorates
Solution Approach 1:
The patent introduces dynamic properties to the implant by using resilient material that can elastically deform in response to joint motion and loading. The implant is not rigid and fixed but rather dynamic and adaptable, allowing it to flex and conform to the natural range of motion of the joint while maintaining structural support, thereby improving adaptability without sacrificing strength.
3Strength
If cement-like mixture is used to fix implant to bone, then initial fixation strength is improved, but long-term reliability deteriorates due to loosening and infection
Solution Approach 1:
The patent uses the inner filler material (cement or bone graft) as an intermediary between the resilient implant and the surrounding bone tissue. This intermediary layer provides initial fixation strength while also facilitating biological integration and reducing the risk of loosening and infection over time, thereby improving long-term reliability while maintaining adequate fixation strength.
4Ease of manufacture
If traditional arthroplasty implants are used, then joint replacement can be performed, but shock absorption and cushioning capability deteriorate
Solution Approach 1:
The patent incorporates shock absorption and cushioning capabilities directly into the implant material itself, providing beforehand cushioning to protect the joint from degradation. The resilient material acts as a built-in shock absorber that mitigates the harmful effects of repetitive joint loading and inflammatory enzymes, preventing further joint damage while the implant is in place.
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 implant enhances joint motion, reduces pain, and improves function by enduring variable joint forces and cyclic loads, promoting joint regeneration and extending the lifespan of joint replacements beyond traditional metal and plastic alternatives.
Implementation Method 1
The implant should be secured to at least one of the bones of the joint structure and acts as a resilient spacer between moving bones during limb movement
Implementation Method 2
The implant may endure variable joint forces and cyclic loads while reducing pain and improving function after injury or disease
Data Source
AI summary
This disclosure is directed to a resilient interpositional arthroplasty implant. Such implants function to pad cartilage defects, cushion, and replace or restore the articular surface, which may preserve joint integrity, reduce pain and improve function. The implant may endure variable joint compressive and shear forces and cyclic loads. The implant may repair, reconstruct, and regenerate joint anatomy, and thereby improve upon joint replacement alternatives. The walls of this invention may capture, distribute and hold living cells until aggregation and hyaline cartilage regrowth occurs. The implant may be deployed into debrided joint spaces, molding and conforming to surrounding structures with sufficient stability so as to enable immediate limb use after outpatient surgery. Appendages of the implant may repair or reconstruct tendons or ligaments, and menisci by interpositional inflatable or compliant polymer arthroplasties that promote anatomic joint motion.