Barbed prosthetic knit
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Solution Overview
Problem
Prosthetic fabrics with barbs used in wall-reinforcing prostheses often get entangled or damaged during rolling and unrolling for coelioscopic surgery, making it difficult to deploy them correctly at the implantation site due to their small diameter and lack of protection.
Innovation Solution
A prosthetic knit with openwork faces and barbs that can be easily rolled and unrolled, featuring a specific knitting pattern that allows barbs to be trapped during rolling but released with minimal force, preventing damage and ensuring smooth deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the prosthesis is rolled up to fit through a small-diameter trocar, then it can be introduced via coelioscopic surgery, but the barbs become entangled in the fabric and damage occurs
Solution Approach 1:
The prosthesis is pre-rolled into a compact cylindrical form before insertion, allowing it to pass through the small-diameter trocar channel. The barbs are positioned to protrude outward from the rolled configuration, enabling them to engage with the trocar wall during insertion and secure the prosthesis in place without becoming entangled in the fabric.
Solution Approach 2:
The prosthesis is designed to be nested within itself in a rolled configuration, with the fabric layers arranged so that barbs on outer layers do not penetrate or entangle with inner layers during the rolling process. This nested structure allows compact insertion while preserving barb integrity.
2Ease of operation
If the prosthesis is forced through the trocar channel, then it can be deployed, but the barbs may be damaged during transportation
Solution Approach 1:
A protective sheath or delivery catheter is used as an intermediary device to convey the rolled prosthesis through the trocar channel. The sheath protects the protruding barbs from damage during transportation and insertion, allowing them to engage with the trocar wall securely without becoming bent or broken.
Solution Approach 2:
The prosthesis is designed with a protective coating or outer layer that cushions the barbs during the rolling and insertion process, preventing them from becoming damaged while still allowing them to function effectively once deployed.
3Strength
If the barbs protrude outward for anchoring, then they can hook into biological tissues, but they become entangled during rolling
Solution Approach 1:
The barbs are positioned to protrude outward from specific localized areas of the rolled prosthesis rather than uniformly across the entire surface. This localized arrangement allows the barbs to maintain their anchoring capability in key positions while minimizing their interference with the rolling and unrolling process in other areas.
Solution Approach 2:
The prosthesis is designed with flexible fabric and strategically positioned barbs that can dynamically adjust their orientation during rolling and unrolling. The barbs are arranged to flex and move with the fabric during the rolling process, reducing entanglement, while maintaining their anchoring function when the prosthesis is deployed.
Data Source
Figure 1A~3
Figure 4A~5
AI summary
The present invention relates to a prosthetic knit (1) comprising at least a first monofilament yarn of biocompatible polymer material defining first and second opposite faces, at least the second face including openings, and at least a second biocompatible and heat-fusible monofilament yarn which forms barbs (2) that protrude outward from at least said first face, wherein the openings and the barbs (2) are distributed such that when the knit (1) is rolled upon itself at least some of the barbs (2) present on the first face are caused to be trapped within some of the openings on the second face, and when the knit (1) is unrolled the trapped barbs (2) will be released from the openings of the second face by applying an average force of 1.13 ± 0.33 N.