Segmented Hydrogel Anchors for Minimally Invasive Cartilage Replacement
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Solution Overview
Problem
Current treatments for osteoarthritis and post-traumatic osteoarthritis, such as total joint replacement, require open surgery and extensive rehabilitation, which is invasive and costly, and there is a need for minimally invasive interventions that can effectively replace damaged cartilage without leading to joint deformities.
Innovation Solution
Development of flexible, hydrogel-based prosthetic implants with segmented structures that can be arthroscopically inserted and tensioned to conform to joint surfaces, providing a lubricious sliding layer and secure anchoring to bone, allowing for tissue ingrowth and reducing the need for open surgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If total joint replacement is performed to treat osteoarthritis, then joint function is restored, but the surgery is invasive and requires extensive rehabilitation
Solution Approach 1:
The implant is divided into multiple segments that can be inserted separately through arthroscopic portals. Each segment contains a portion of the hydrogel bearing surface and anchoring structure, allowing minimally invasive insertion while collectively providing complete joint surface coverage and restoration of joint function.
Solution Approach 2:
The segments are designed to be nested or stacked within each other during insertion, similar to Russian nesting dolls. This allows multiple implant components to be delivered through small arthroscopic portals rather than requiring large open surgical incisions, reducing surgical invasiveness while maintaining full functional restoration.
2Stability of the object's composition
If rigid anchoring structures are used to secure the implant to bone, then fixation stability is improved, but the implant cannot conform to curved joint surfaces
Solution Approach 1:
The implant uses flexible cables or sutures instead of rigid anchors to attach the hydrogel bearing surface to the bone. These flexible elements allow the implant to dynamically conform to the curved joint surface while maintaining stable fixation through tension, combining adaptability with fixation stability.
Solution Approach 2:
The anchoring structure employs flexible cables, sutures, or thin film elements that can bend and conform to the curved geometry of the joint surface while providing sufficient tensile strength for stable fixation. This flexible anchoring system adapts to surface irregularities while maintaining secure attachment.
3Adaptability or versatility
If the implant is made flexible to conform to joint surfaces, then adaptability to curved surfaces is improved, but structural rigidity required for load bearing is reduced
Solution Approach 1:
The implant combines hydrogel material with flexible anchoring structures and cable tensioning systems to create a composite construct. The hydrogel provides conformability to the joint surface, while the tensioned cables and anchoring structures provide the necessary structural rigidity for load bearing, achieving both adaptability and strength.
Solution Approach 2:
The cables are pre-tensioned during implantation to provide immediate structural support and rigidity. This preliminary tensioning action creates a stable, load-bearing structure that maintains the implant's position and supports joint loads while allowing the hydrogel surface to conform to the joint geometry.
4Reliability
If open surgery is used for cartilage replacement, then complete implant placement is achieved, but rehabilitation time is extended
Solution Approach 1:
The implant is segmented to allow insertion through small arthroscopic portals rather than requiring large open incisions. This minimally invasive approach reduces tissue trauma and surgical recovery time while maintaining complete implant placement and coverage of the joint surface through coordinated insertion of multiple segments.
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 enables effective replacement of damaged cartilage with reduced pain, improved joint function, and minimized rehabilitation time, potentially delaying or avoiding the need for total joint replacement by providing a stable, flexible, and secure fixation of the hydrogel bearing surface to the bone.
Implementation Method 1
a lubricious hydrogel sliding layer on the opposite side
Implementation Method 2
Tension on the lines can alter the shape of the implant by application of pressure between segments
Data Source
AI summary
A prosthetic implant replaces hyaline cartilage in a synovial joint with a flexible polymer sliding surface, preferably of hydrogel, on a segmented support with an array of adjacent segments to which the hydrogel is molded. Adjacent segments are laterally and angularly displaceable permitting the implant to conform to rounded or irregular surfaces or to be rolled or folded for arthroscopic placement. Tension cables threaded through segments along a circuit can cinch segments together for stiffening the supporting layer and/or the cable can pull the implant against a bone surface. Adjacent segments can have inter-engaged structures. In some embodiments the segments are carried on a flexible foil or fibrous sheet.