Self-reinforcing Tissue Fixation via Serial Suture Loops
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Solution Overview
Problem
Current tissue-to-bone fixation methods lack self-reinforcement mechanisms that can detect impending failure and utilize potentially destructive forces to reinforce the repair construct, leading to inadequate resistance against tensile failure and slippage.
Innovation Solution
The implementation of a self-reinforcing mechanical system using a chain-like serial suture loop construct, specifically the FiberChain technique, which employs high-strength sutures like FiberWire and anchors such as SwiveLock and Biocorkscrew to create a knotless fixation that increases frictional resistance and surface area, allowing the construct to self-reinforce under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard double-row repair fixation is used, then the surgical procedure is simple and quick, but the construct lacks self-reinforcement mechanisms and has lower resistance against tensile failure and slippage
Solution Approach 1:
The fixation construct is segmented into multiple serial suture loops (at least two loops) connected in sequence, where each loop can independently engage the tissue and bone. This segmentation allows the load to be distributed across multiple fixation points, preventing single-point failure and providing progressive reinforcement as stress is applied to the construct.
Solution Approach 2:
The serial suture loop construct is designed to be dynamic rather than static, allowing the loops to tighten and tighten further in response to applied tensile loads. This dynamic behavior enables the construct to self-reinforce under stress, with each loop contributing to the overall strength as the tissue is pulled, thereby increasing resistance against failure and slippage.
2Strength
If high-strength sutures and anchors are used to increase frictional resistance, then the fixation strength is improved, but the surgical technique and device complexity increase
Solution Approach 1:
The serial suture loop construct is designed to be self-reinforcing, where the application of load automatically tightens the loops and increases frictional resistance without requiring additional surgical intervention or complex adjustment mechanisms. The construct serves itself by converting the applied tensile force into increased fixation strength through the mechanical tightening of the serial loops.
Solution Approach 2:
The construct utilizes changes in mechanical parameters (tension, friction, contact pressure) in response to applied loads. As tensile force is applied, the suture loops tighten, increasing the frictional resistance and contact pressure between the tissue and bone, thereby dynamically adjusting the fixation strength based on the applied stress rather than relying on fixed pre-determined parameters.
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 FiberChain technique enhances the ultimate load to failure and resistance against slippage by inducing compressive restoring forces and a wedge effect, demonstrating improved biomechanical performance compared to standard double-row repairs.
Implementation Method 1
As the repair construct is stressed, there is a feedback mechanism (self-reinforcing) against failure that is initially triggered by early failure. Simply stated, the construct 'detects' its early/impending failure and utilizes the potentially destructive force to reinforce itself.
Implementation Method 2
The FiberChain technique enhances the ultimate load to failure and resistance against slippage by inducing compressive restoring forces and a wedge effect
Implementation Method 3
The FiberChain technique enhances the ultimate load to failure and resistance against slippage by inducing compressive restoring forces and a wedge effect
Data Source
AI summary
Self-reinforcing mechanical systems with application to biological fixation of a first tissue (for example, soft tissue) to a second tissue (for example, bone). As a repair construct is stressed, there is a feedback mechanism (self-reinforcing) against failure that is initially triggered by early failure. The construct “detects” its early/impending failure and utilizes the potentially destructive force to reinforce itself.