Double Row Collapsible Suture Construct for Bone Fixation
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Solution Overview
Problem
Current techniques for double-row tissue fixation in surgeries, such as rotator cuff repairs, face challenges in reliably setting the correct tension of sutures and often require multiple anchors, with low suture retention capacity in lateral rows due to compression between bone and anchor.
Innovation Solution
A tissue repair construct comprising a first implantable anchor with a flexible member featuring a collapsible loop, allowing tension to be applied after anchor insertion, and using the same type of anchor for both medial and lateral rows, enhancing fixation strength and simplifying the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If current techniques are used for double-row fixation, then multiple anchors are required for both medial and lateral rows, but the suture retention capacity for lateral row anchor is low due to compression between bone and anchor
Solution Approach 1:
The suture is divided into multiple independent portions (first suture portion, second suture portion, third suture portion) that can be separately engaged with the anchor. This segmentation allows the suture to distribute load across multiple engagement points rather than relying on a single compressed interface, thereby improving retention capacity without requiring additional anchors.
Solution Approach 2:
The patent introduces a third dimension to the suture-anchor interface by creating a three-dimensional suture configuration that engages with the anchor from multiple spatial directions. The suture portions are arranged to engage the anchor body at different locations and orientations, transforming the traditional two-dimensional compressed interface into a multi-dimensional engagement system that enhances retention.
2Reliability
If tension is set while the anchor is inserted using current techniques, then the procedure can be completed, but it is difficult to reliably set the correct amount of tension
Solution Approach 1:
The suture is pre-configured with multiple portions and engagement features before insertion. The suture is prepared with predetermined tensioning mechanisms and engagement points that allow for reliable tension setting after anchor insertion. This preliminary preparation ensures that when the anchor is inserted, the suture is already positioned to accept and maintain correct tension levels without requiring complex real-time adjustment.
3Device complexity
If the same type of anchor is used for both medial and lateral rows, then the procedure is simplified, but the suture retention capacity must be sufficient for both rows
Solution Approach 1:
The anchor design incorporates universal engagement features that can accommodate multiple suture portions and configurations. The anchor body includes multiple engagement points and a collapsible passage system that can handle different suture arrangement patterns, allowing the same anchor type to be used for both medial and lateral rows while maintaining sufficient retention capacity through its multi-functional engagement capabilities.
Data Source
AI summary
Tissue fixation and repair constructs and methods of repair using the same are provided. An exemplary tissue fixation and repair construct can include a first implantable anchor coupled to a suture having a fixed tail and a tensioning tail. The fixed tail can include an overhand knot located distally adjacent to the finger trap, such that the overhand knot substantially abuts the finger trap when adjacent thereto, a fixed stopper knot configured to prevent further movement of the fixed tail through a second implantable anchor when the second implantable anchor is placed onto the suture, and a finger trap. The tensioning tail can be passed through the finger trap and overhand knot, and can be used to adjust the tension of the tissue fixation and repair construct when the first implantable anchor and the second implantable anchor are inserted into bone.