Demineralized Bone Fiber Implant for Stable Cartilage Defect Fixation
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Solution Overview
Problem
Existing medical devices struggle to effectively repair osteochondral and chondral defects due to the difficulty in fixing implants in thin articular cartilage and the need for implants that stimulate both cartilage and bone regeneration, while accounting for intertwined changes in these tissues.
Innovation Solution
A demineralized bone fiber implant with a peg portion and sheet portion, designed to facilitate fixation and conduit for bone marrow, providing osteo and chondro-induction, and self-stabilization during surgery, utilizing bone morphogenic proteins for tissue repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an implant is used to repair osteochondral defects, then cartilage and bone regeneration is promoted, but fixation in thin articular cartilage is difficult
Solution Approach 1:
The implant is divided into two distinct functional portions: a sheet portion for cartilage coverage and a peg portion for bone fixation. This segmentation allows each portion to be optimized for its specific function - the sheet provides a large surface area for cartilage regeneration while the peg provides mechanical anchorage in the subchondral bone, thereby resolving the contradiction between promoting tissue regeneration and achieving secure fixation.
Solution Approach 2:
The invention transitions from a two-dimensional sheet implant to a three-dimensional structure by adding the peg portion that extends into the subchondral bone. This dimensional addition provides a new fixation mechanism that anchors the implant through the thin cartilage layer into the underlying bone, solving the fixation difficulty while maintaining the regenerative function.
2Reliability
If an implant provides osteo and chondro-induction, then both bone and cartilage repair is stimulated, but the implant structure becomes more complex
Solution Approach 1:
The demineralized bone matrix material serves multiple functions simultaneously: it provides structural support, delivers osteoinductive signals through bone morphogenic proteins, and facilitates chondroinduction when placed in contact with cartilage defects. This multi-functionality allows a single material composition to address both bone and cartilage regeneration needs without requiring separate implants for each tissue type.
Solution Approach 2:
The implant utilizes demineralized bone matrix, which is a composite material containing collagen framework and bone morphogenic proteins. This composite structure naturally provides both osteoinductive and osteoconductive properties, and when configured as a sheet with peg, also provides mechanical fixation capability, thereby achieving comprehensive tissue repair with a relatively simple material composition.
3Stability of the object's composition
If the implant is fixed securely in the defect site, then stability during surgery is improved, but the ability to allow bone marrow conduit access is reduced
Solution Approach 1:
The demineralized bone matrix material inherently possesses a porous structure that allows bone marrow elements and blood vessels to infiltrate and form conduits. This porosity is maintained throughout the sheet and peg portions, enabling the implant to be securely fixed while simultaneously allowing bone marrow access and integration, thus resolving the contradiction between stability and adaptability.
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 the regeneration of osteochondral and chondral defects by stabilizing during surgery, augmenting blood clot formation, and promoting bone and cartilage repair through molecular signals, offering a suitable form for arthroscopic surgery.
Implementation Method 1
The bone marrow is then retained in the defect site where it can stimulate a repair of the tissue with the bone morphogenic proteins that are present in the demineralized bone fibers providing molecular signals to stimulate and enhance the repair
Implementation Method 2
The presently disclosed implant is capable of: 1) providing an implant that is both osteo and chondro-inductive and osteo chondro conductive to facilitate regeneration of a chondral or osteochondral defect
Implementation Method 3
the peg portion of the implant is placed in a cavity formed in the bone that acts with dual purpose of both fixing the implant in place
Implementation Method 4
The bone marrow is then retained in the defect site where it can stimulate a repair of the tissue
Data Source
AI summary
A method of repairing a chondral or osteochondral defect using an implant composition made of a plurality of demineralized bone fibers formed into a contiguous shape having a peg portion and a sheet portion to facilitate cartilage repair.