Barbed Prosthetic Knit Structure for Smooth Trocar Deployment
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Solution Overview
Problem
Prosthetic fabrics with barbs used in wall-reinforcing prostheses often become 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 biocompatible prosthetic knit with openwork faces and heat-fusible monofilament yarns forming barbs, designed to be rolled up and unrolled effortlessly, using a specific knitting pattern on a warp knitting machine with three guide bars to prevent barb entanglement and ensure easy deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the prosthesis is rolled up to fit through a small-diameter trocar, then it can be used in coelioscopic surgery, but the barbs become entangled in the fabric and may be damaged
Solution Approach 1:
The prosthesis is pre-rolled into a compact cylindrical form before implantation. This preliminary rolling action allows the prosthesis to fit through the small-diameter trocar channel, and the barbs are positioned to protrude outward from the rolled configuration, preventing them from becoming entangled in the fabric during the rolling process itself.
Solution Approach 2:
The barbs are designed with specific local characteristics: they protrude outward from the rolled prosthesis at controlled positions and angles. This local quality ensures that during rolling, the barbs extend away from the fabric body rather than being embedded within it, thus preventing entanglement and damage while maintaining anchoring capability at the implantation site.
2Ease of operation
If the prosthesis is introduced by force through the trocar, then it can be deployed, but the barbs may be damaged during the process
Solution Approach 1:
The prosthesis is pre-rolled into a compact form that fits through the trocar without requiring forceful introduction. The barbs are positioned to protrude outward from this rolled configuration, creating a streamlined profile that slides smoothly through the trocar channel, eliminating the need for forceful introduction that could damage the barbs.
Solution Approach 2:
Instead of introducing a flat or loosely folded prosthesis that would require force and risk barb damage, the invention inverts the approach by pre-rolling the prosthesis into a compact cylindrical form. This inverted configuration reduces the profile and allows smooth passage through the trocar, with barbs positioned outward to prevent entanglement during the introduction process.
3Strength
If the barbs are exposed to facilitate tissue anchoring, then they can hook into biological tissues, but they become entangled during rolling and unrolling
Solution Approach 1:
The prosthesis is pre-rolled into a compact form with barbs positioned to protrude outward. During this preliminary rolling action, the barbs are deliberately oriented away from the fabric body, preventing entanglement. After passage through the trocar, the prosthesis is unrolled and the barbs remain positioned to facilitate tissue anchoring without having become entangled during the rolling and unrolling process.
Solution Approach 2:
The prosthesis transitions dynamically between rolled and unrolled states during implantation. When rolled, the barbs protrude outward in a controlled manner that prevents entanglement. When unrolled at the implantation site, the barbs are positioned to optimize tissue anchoring. This dynamic reconfiguration allows the same structure to serve both protection during transport and function at implantation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The knit allows for easy rolling and unrolling of prosthetic fabrics with barbs, minimizing the force required for unrolling and preventing barb damage, facilitating their use in coelioscopic surgery by ensuring smooth deployment at the implantation site.
Implementation Method 1
barbs that protrude outwards from at least said first face and are obtained by melting loops generated by said second yarn
Data Source
AI summary
The present invention relates to a prosthetic knit based on at least a first yarn of biocompatible polymer material defining first and second opposite and openwork faces, and on at least a second biocompatible and heat-fusible monofilament yarn, forming barbs that protrude outwards from at least said first face and are obtained by melting loops generated by said second yarn, the chart followed for the knitting of said first and second yarns on a warp knitting machine having three guide bars B1, B2, B3 being the following, according to the ISO 11676 standard:—Bar B1: 1.0/0.1//—Bar B2: 1.0/7.7/6.6/7.7//—Bar B3: 2.1/5.5/3.4/0.0// said second yarn following the chart of bar B3. The present invention also relates to a process for manufacturing such a knit.