ACL-Derived Stem Cell Composition for Tendon Graft Ligamentization
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Solution Overview
Problem
Existing anterior cruciate ligament reconstruction surgeries face challenges with a lengthy healing process and the resulting tendon grafts often degenerate into fibrous tissue with weaker biomechanical strength, leading to high re-rupture rates, particularly in young and active individuals.
Innovation Solution
A composition comprising anterior cruciate ligament-derived stem cells and a cruciate ligament extracellular matrix-derived collagen complex is injected into tendon grafts to promote ligamentization, inhibiting fibrosis and enhancing type I collagen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anterior cruciate ligament reconstruction surgery is performed using tendon grafts, then the ruptured ligament can be replaced and knee stability can be restored, but the tendon graft undergoes fibrosis and degenerates into weak fibrous tissue during the healing process, resulting in reduced biomechanical strength and high re-rupture rates
Solution Approach 1:
The patent introduces cruciate ligament extracellular matrix as an intermediary substance that mediates between the tendon graft and the host tissue. This extracellular matrix serves as a scaffold that guides proper tissue regeneration and prevents fibrosis by providing the correct biochemical and structural environment for ligament-like tissue formation, thereby resolving the contradiction between achieving ligament reconstruction and preventing harmful fibrosis
Solution Approach 2:
The patent changes the biochemical parameters of the healing environment by incorporating specific extracellular matrix components (collagen types, proteoglycans, glycoproteins) that are characteristic of cruciate ligament tissue. This parameter change transforms the healing process from fibrosis (producing type III collagen and disorganized tissue) to ligamentization (producing type I collagen and organized ligament structure), thereby improving ligament strength while preventing fibrosis
2Duration of action of stationary object
If traditional tendon graft healing is allowed to proceed naturally, then the healing process completes in 12 to 24 months, but the tendon graft degenerates into fibrous tissue with less than 50% of normal ligament biomechanical strength
Solution Approach 1:
The patent applies preliminary action by pre-processing the tendon graft with cruciate ligament extracellular matrix before implantation. This preliminary treatment primes the graft to undergo ligamentization rather than fibrosis during healing, establishing the correct tissue differentiation pathway in advance. As a result, the healing process is accelerated and the final tissue strength is improved, resolving the contradiction between healing time and strength
Solution Approach 2:
The patent creates a composite material by combining tendon graft tissue with cruciate ligament extracellular matrix components. This composite structure provides both the mechanical framework of the tendon graft and the biochemical signals of native ligament tissue, guiding regenerative processes to produce strong, ligament-like tissue rather than weak fibrous tissue, thereby improving biomechanical strength while managing healing time
Data Source
AI summary
The present invention relates to a composition for inducing ligamentization of tendons, comprising anterior cruciate ligament-derived stem cells. The use of the composition can inhibit fibrosis in tendon grafts used for anterior cruciate ligament reconstruction surgeries and promote the healing process. Additionally, the composition may further include extracellular matrix proteins of the cruciate ligament tissue.