Hierarchical Microstructure Soft Tissue Grafts for Repositionable Repair
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Solution Overview
Problem
Current soft tissue repair products face challenges in maintaining positioning without mechanical fixation, as they either require sutures, which cause tissue injury, or are repositionable but lack long-term adhesion strength, and there is no effective treatment for adhesion formation post-surgery.
Innovation Solution
A soft tissue repair graft with a self-adhering layer and a fixation mechanism that uses a hierarchical microstructure to temporarily adhere to tissue, allowing repositioning without damaging the surrounding tissue and providing adequate adhesion strength for long-term placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If mechanical fixation (sutures) is used to maintain positioning, then long-term positionability is improved, but tissue injury increases
Solution Approach 1:
The patent replaces mechanical fixation systems (sutures, tacks, staples) with a chemical adhesive bonding system. The positioning agent forms chemical bonds with the tissue defect, eliminating the need for mechanical fixation devices that cause tissue injury while providing long-term positionability.
Solution Approach 2:
The positioning agent acts as an intermediary substance between the soft tissue repair graft and the tissue defect. This intermediary material provides temporary adhesion during surgery and long-term positionability without requiring direct mechanical penetration or suturing of the tissue, thereby avoiding tissue injury.
2Object-affected harmful factors
If no mechanical fixation is used, then tissue injury is reduced, but adhesion strength is insufficient
Solution Approach 1:
The patent changes the bonding mechanism from mechanical to chemical by introducing a positioning agent with adhesive properties. This chemical bonding provides sufficient adhesion strength to maintain positioning without mechanical fixation, reducing tissue injury while maintaining the required strength.
3Ease of operation
If repositionable characteristics are provided, then ease of operation is improved, but long-term positionability deteriorates
Solution Approach 1:
The patent creates a dynamic fixation system where the positioning agent provides temporary, reversible adhesion during surgery (allowing repositioning) and transitions to long-term positionability. The adhesive bonding maintains flexibility for surgical manipulation while establishing stable attachment for long-term positioning.
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 graft maintains temporary positioning during surgery and limits adhesion formation by using a self-adhering layer with hierarchical microstructures, ensuring secure placement without mechanical fixation and minimizing tissue trauma.
Implementation Method 1
a positioning agent that has an adherence capability adequate to temporarily maintain a surgical soft tissue repair prosthesis in place, otherwise unsupported, against a targeted tissue location during a surgical procedure
Implementation Method 2
A soft tissue repair graft with a self-adhering layer and a fixation mechanism that uses a hierarchical microstructure to temporarily adhere to tissue
Data Source
AI summary
Soft tissue repair grafts are described comprising an anti-adhesion layer, a structural layer, and a localization layer. These layers may be distinct or integrated into one substrate. The term layer is used to distinguish tissue repair graft functionality rather than distinct material layers. The distinct layers of functionality may comprise a single plane of a substance.