Adjustable Multi-Loop Fixation for Precise ACL Graft Tensioning
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Solution Overview
Problem
Conventional devices fail to provide simplified attachment of tendons or ligaments to fixation devices using suturing techniques, leading to inconsistent tensioning and potential damage during ACL reconstruction surgeries, compromising the success of the operation.
Innovation Solution
An adjustable multi-loop fixation device comprising a fixation plate with circular holes and elliptical grooves, combined with a flexible braided medical strand, allows for precise tensioning and secure anchoring of grafts by forming multiple adjustable loops, minimizing slip and creep.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional suturing techniques are used to attach grafts to fixation devices, then the attachment can be achieved, but the tensioning is inconsistent and requires high forces that can injure the surgeon or damage gloves
Solution Approach 1:
The fixation device incorporates an adjustable loop mechanism that allows dynamic tensioning of the graft. The loop can be adjusted to achieve the desired tension and then locked in place, providing both precision and ease of operation without requiring excessive force from the surgeon.
Solution Approach 2:
The device introduces an intermediary locking mechanism between the suture and the fixation plate. This lock arrangement acts as a mediator that maintains consistent tension on the graft without requiring the surgeon to apply high forces directly to the suture, thereby preventing injury and glove damage.
2Adaptability or versatility
If adjustable loops are used to allow tension adjustment, then graft tensioning flexibility is improved, but the loop extends under graft tension due to higher tension at lock arrangement resulting in gradual sliding of end suture
Solution Approach 1:
The fixation device divides the loop into multiple segments or sections. This segmentation allows the loop to maintain its shape and tension under load, preventing the extension and sliding issues that occur with single-loop designs. The segmented structure provides both adjustability and stability.
3Strength
If multiple sutures are used to achieve required forces, then fixation strength can be increased, but the complexity of the procedure increases
Solution Approach 1:
The device combines multiple suture functions into a single integrated strand with a knot. This single strand passes through the fixation plate multiple times to create the necessary loops and tensioning points, achieving the required fixation strength without requiring multiple separate sutures, thereby simplifying the procedure.
Data Source
AI summary
The present subject disclosed a device for tissue repairs and reconstruction of anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL). Further the device comprises a fixation plate having an upper side and a lower side, the upper side comprising a plurality of circular through holes, an elliptical groove with apertures connected by a bridge, and a hole with a step extending from the upper side to the lower side. In the embodiment, the device comprises further a strand, the strand comprises a knot. The knot divides the strand into a tension end and a lead end.