Cylindrical Suture Anchor Tangential Expansion for Bone Fixation
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Solution Overview
Problem
Existing all suture anchors struggle to achieve sufficient tangential expansion and deformation for effective fixation in cancellous bone, due to limited deformation capabilities and difficulty in forming a blocking structure.
Innovation Solution
The all suture anchor and anchor pulling-and-forming kit utilize a cylindrical suture anchor body with a pulling suture that, when pulled, causes the anchor body to bend and expand tangentially, forming a Y-shaped anchor segment that securely clamps the bone canal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the anchor body is directly penetrated by a suture thread and folded in half for implantation, then the implantation process is simple, but the anchor body cannot achieve sufficient tangential expansion and deformation to lock in the bone canal
Solution Approach 1:
The anchor body is divided into multiple expansion segments that can independently deform and expand. The suture thread is routed through multiple segments rather than directly penetrating the anchor body, allowing each segment to expand tangentially when the suture is pulled, achieving reliable bone canal locking while maintaining simple implantation procedure
Solution Approach 2:
The anchor body is designed to expand in the tangential dimension rather than only radially. By routing the suture thread through multiple segments and pulling it to create tangential expansion, the anchor achieves three-dimensional deformation that locks it securely in the bone canal while keeping the implantation process simple
2Strength
If the anchor body is made rigid to maintain structural integrity, then the anchor strength is high, but the anchor body cannot be deformed or the deformation amount is very small
Solution Approach 1:
Different parts of the anchor body have different mechanical properties. The anchor body includes rigid portions for structural integrity and strength, and flexible expansion segments that can deform tangentially. The suture thread is routed through these flexible segments, allowing localized deformation while maintaining overall anchor strength and structural integrity
Solution Approach 2:
The anchor body transitions from a static rigid structure to a dynamic structure with movable expansion segments. When the suture thread is pulled, the segments dynamically expand tangentially to lock in the bone canal. This dynamic capability allows the anchor to adapt its shape while maintaining sufficient strength through its rigid framework
3Reliability
If the anchor body is designed to expand tangentially to lock in the bone canal, then the fixation effect is improved, but the anchor body may be squeezed into a flat sheet-like structure that compromises locking effect
Solution Approach 1:
The anchor body is segmented into multiple independent expansion sections rather than a single continuous structure. When the suture thread is pulled, each segment expands tangentially in a controlled manner, preventing the entire anchor body from being squeezed into a flat sheet. This segmentation maintains shape integrity while achieving reliable fixation effect through distributed tangential expansion
Data Source
AI summary
The present application provides an all suture anchor, and relates to the technical field of medical devices. The all suture anchor includes a suture anchor body and a pulling suture. The suture anchor body is in a shape of cylinder, a first end port and a second end port are respectively formed at two ends of the suture anchor body in an axis direction of itself, and a first through hole is formed at a side wall of the suture anchor body close to the first end port; a fixed end of the pulling suture enters into the suture anchor body from the first end port and passes out from the first through hole, and the fixed end of the pulling suture is fixedly arranged on the suture anchor body.