Flexible Ligation Loop Structure to Reduce Tissue Necrosis
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Solution Overview
Problem
Existing medical instruments for ligation are not adequately designed to prevent complications such as necrosis and pancreatic fistula during partial resection of organs like liver and pancreas, and are not sufficiently less invasive.
Innovation Solution
A medical instrument comprising a band body and rod-shaped bodies made of biodegradable and bioabsorbable polymers, with specific surface curvatures and locking features to minimize tissue damage and maintain blood flow, featuring adjustable tightening and cushioning to reduce complications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ligation instruments are used to ligate living tissue, then ligation function is achieved, but tissue damage such as necrosis and pancreatic fistula occurs
Solution Approach 1:
The rod-shaped bodies are designed with different surface curvatures at different locations: the first rod-shaped body has a convex curvature on its inner surface, while the second rod-shaped body has a concave curvature on its inner surface. These localized curvature variations create optimal contact surfaces with the ligated tissue, distributing pressure evenly and preventing focal points of damage that would cause necrosis or pancreatic fistula.
Solution Approach 2:
The band body is made of biodegradable and bioabsorbable polymer materials that provide cushioning protection to the tissue before and during ligation. These materials gradually degrade over time, providing initial protection and support while allowing tissue healing, thereby preventing necrosis and other tissue damages associated with conventional permanent ligatures.
2Reliability
If traditional ligation methods are used, then tissue can be ligated, but the procedure is invasive and carries high risk of complications
Solution Approach 1:
The medical instrument combines multiple materials with complementary properties: the band body uses biodegradable and bioabsorbable polymers that provide both ligation strength and tissue compatibility, while the rod-shaped bodies use materials with specific surface curvatures optimized for tissue contact. This composite material approach reduces invasiveness and complication risks while maintaining effective ligation function.
3Reliability
If the band body is tightly ligated to ensure secure closure, then ligation effectiveness improves, but tissue necrosis risk increases
Solution Approach 1:
The rod-shaped bodies feature specific surface curvatures (convex on the first body, concave on the second body) that create an optimized contact interface with the tissue. This localized geometric design distributes the ligating force evenly across the tissue surface, preventing focal compression points that would lead to necrosis while maintaining secure overall closure.
Solution Approach 2:
The biodegradable and bioabsorbable polymer materials in the band body provide inherent cushioning properties that protect the tissue from excessive compression forces. As these materials gradually degrade, they maintain tissue perfusion and prevent necrosis while still providing secure ligation during the critical healing period.
Data Source
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AI summary
A medical instrument, comprising a flexible band body having a distal end and a proximal end; a flexible first rod-shaped body having a distal end and a proximal end; and a flexible second rod-shaped body having a distal end and a proximal end, wherein the distal end of the band body and the proximal end of the first rod-shaped body are connected, the distal end of the first rod-shaped body and the proximal end of the second rod-shaped body are connected via a connecting portion, the band body is more flexible than the first rod-shaped body and the second rod-shaped body, the second rod-shaped body has a locking part, the band body has a locking corresponding part, when tightened the locking part and the locking corresponding part, the proximal end of the first rod-shaped body and the distal end of the second rod-shaped body are connected via a part of the band body, the connecting portion is inflected, and a loop having a desired size can be formed by the first rod-shaped body, the second rod-shaped body and the part of the band body, and the second rod-shaped body further has a feature for placing the rest of the band body along an outer surface of the second rod-shaped body in the direction from the distal end to the proximal end of the second rod-shaped body when had been tightened the locking part and the locking corresponding part.