Coil Tissue Fastener With Rotating Stylet
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Solution Overview
Problem
Existing tissue fastening tools for laparoscopic surgery face challenges in securely fastening biological tissues through natural orifices, particularly in maintaining effective contact and preventing leakage between the duodenum and common biliary duct, due to issues with the shape of the fastening tool and the distribution of forces during the fastening process.
Innovation Solution
A tissue fastening apparatus comprising a tissue fastening tool made of an elastic wire rod wound in a coil shape, with a spring portion and an end coil portion, and an applicator that includes a needle tube and a stylet, where the stylet and tissue fastening tool are disengageably engaged and rotatably connected, allowing for controlled rotation and deployment to ensure proper fastening and prevent entanglement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fastening tool is pushed out by the projection mechanism and pierced into the body, then the fastening tool can be deployed to join hollow organs, but the fastening tool may become distorted or tangled during deployment
Solution Approach 1:
The fastening tool is pre-loaded in a straight, compressed state within the needle tube before use. The needle tube maintains the tool's linear configuration during insertion, and only upon deployment does the tool return to its predetermined coil shape, ensuring proper formation without tangling during the critical insertion phase
Solution Approach 2:
The needle tube serves as an intermediary device that temporarily constrains the fastening tool in a straight configuration during insertion. This intermediary structure protects the tool from becoming distorted during deployment and ensures it emerges in the correct orientation for effective tissue fastening
2Reliability
If the fastening tool is returned to coil shape by body temperature, then the hollow organs are joined, but the tool may cause axial deviation or uneven force distribution on the tissues
Solution Approach 1:
The fastening tool is pre-formed with a specific coil geometry and winding direction before sterilization and packaging. This preliminary shaping ensures that when the tool is deployed and returns to its coil shape through body temperature, it assumes the correct orientation for uniform force distribution on the tissues, preventing axial deviation
Solution Approach 2:
The fastening tool employs an asymmetric coil design with specific winding direction and pitch variations along its length. This asymmetric geometry creates a predetermined bending moment that guides the tool into the correct orientation upon deployment, ensuring symmetric force distribution on the opposing tissue surfaces despite the asymmetric tool shape
3Productivity
If the stylet is moved toward the distal end of the needle tube to deploy the fastening tool, then the tool is dispensed to the tissue, but the stylet and fastening tool may become entangled
Solution Approach 1:
The fastening tool is pre-loaded in a compressed, linear state within the needle tube, with the stylet positioned to engage the tool's proximal end. This preliminary arrangement ensures that when the stylet is advanced, it pushes the tool out in a controlled manner without causing entanglement, as the tool emerges already oriented in the correct configuration
Solution Approach 2:
The deployment mechanism is segmented into distinct functional zones: the needle tube provides a constrained passage for the fastening tool, the stylet provides controlled push force from the proximal end, and the distal end of the tool is free to expand into its coil shape. This segmentation prevents interference and entanglement between components during the dispensing process
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 apparatus effectively fastens the duodenum and common biliary duct by ensuring balanced forces and preventing axial deviation, thereby maintaining close contact and preventing leakage, facilitating efficient bile drainage and reducing the risk of complications like biliary peritonitis.
Implementation Method 1
The tissue fastening tool is made of an elastic wire rod and is wound in a coil shape
Data Source
AI summary
A tissue fastening apparatus includes a tissue fastening tool, with fastens a first biological tissue and a second biological tissue so as to bring the tissues into close contact and an applicator for indwelling the tissue fastening tool. The tissue fastening tool is made of an elastic wire rod and is wound in a coil shape. The applicator includes a needle tube accommodated in an inner cavity with the tissue fastening tool stretched, a stylet inserted into the inner cavity of the needle tube nearer to the proximal side than the tissue fastening tool, and a rotating mechanism that rotates the stylet around an axis when the stylet is moved toward a distal end of the needle tube. The tissue fastening tool and the stylet are disengageably engaged with each other and integrally and rotatably connected with each other. The rotating mechanism rotates the stylet in a direction opposite to the winding direction of the tissue fastening tool as seen from the proximal side.