Tenocyte-Seeded Bioscaffold for Rotator Cuff Repair
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Solution Overview
Problem
Current methods for treating rotator cuff tears, including the use of bioscaffolds and synthetic implants, have shown limited long-term success due to issues like non-functional fatty tissue invasion, tenosynovitis, loosening, and device failure, leading to sub-optimal clinical outcomes.
Innovation Solution
A novel cell-based tissue engineering approach involving a tenocyte-seeded bioscaffold, where tenocytes are expanded in vitro and implanted proximal to the rotator cuff tear, utilizing a culture medium with insulin and glucocorticoids to enhance tissue integration and healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bioscaffolds and synthetic implants are used to treat rotator cuff tears, then tissue ingrowth and wound healing are encouraged, but non-functional fatty tissue invasion, tenosynovitis, loosening, and device failure occur
Solution Approach 1:
The patent applies preliminary action by pre-seeding the bioscaffold with tenocytes before implantation. This advance preparation ensures that functional tendon cells are already present to guide tissue regeneration, preventing the invasion of non-functional fatty tissue that occurs with empty scaffolds.
Solution Approach 2:
The patent applies local quality by using a culture medium containing specific concentrations of insulin (0.00005% to 0.1% w/v) and glucocorticoid (0.00001% to 0.1% w/v) to selectively promote tenocyte proliferation and maintain tenocyte phenotype, creating a localized environment that favors functional tendon tissue over fatty tissue invasion.
2Reliability
If bioscaffolds are implanted to encourage tissue ingrowth, then wound healing is improved, but device loosening and implant failure occur due to continuous loading and abrasion
Solution Approach 1:
The patent applies preliminary action by culturing tenocytes on the bioscaffold before implantation, allowing the cells to establish themselves and begin producing extracellular matrix in advance. This head start reduces the mechanical burden on the device during the critical early healing phase, preventing loosening and fatigue failure.
Solution Approach 2:
The patent applies self-service by enabling the seeded tenocytes to autonomously produce collagen and other extracellular matrix components after implantation. This self-generated tissue progressively replaces the need for the bioscaffold structural support, allowing the device to transfer load successfully without premature failure.
3Reliability
If tenocytes are expanded in vitro to seed the bioscaffold, then functional tissue regeneration is enhanced, but culture time and process complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the culture medium composition with specific ranges of insulin (0.00005% to 0.1% w/v) and glucocorticoid (0.00001% to 0.1% w/v), which accelerates tenocyte proliferation while maintaining cell quality. This optimized parameter regime reduces the required culture time compared to standard culture conditions.
Solution Approach 2:
The patent applies partial action by performing only the essential tenocyte expansion and seeding steps necessary to achieve functional tissue regeneration, rather than attempting to fully differentiate and mature the tissue in vitro. This partial approach reduces culture time while still providing sufficient functional cells to guide regeneration.
Data Source
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AI summary
The present invention relates to methods for preparing bioscaffolds useful in the repair of tears. More specifically, the invention relates to a method of treating rotator cuff tear in a mammalian subject in need thereof comprising the steps of: (i) selectively expanding tenocytes in vitro in culture medium comprising insulin or a functional derivative and a glucocorticoid or a glucocorticoid-like molecule to produce a culture of expanded tenocytes; (ii) seeding a bioscaffold with said expanded tenocytes to produce a tenocyte seeded bioscaffold; and (iii) implanting said tenocyte seeded bioscaffold proximal to the rotator cuff tear. The present invention also relates to a bioscaffold comprising cells, wherein more than 80 % of said cells are tenocytes.