Stent With Dilating Portion For Tissue Fixation
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Solution Overview
Problem
Current medical stent technologies face challenges in effectively fastening biological tissues for procedures like bypassing the common bile duct and duodenum, requiring improved methods for precise tissue fixation and stent deployment without causing damage or leaving foreign materials.
Innovation Solution
A stent with a dilating portion that increases in diameter from the front to the rear, an indwelled portion, and a through hole, combined with a tissue fastening tool and applicator system that uses a puncturing tool, fastening tool pusher, and sheath for controlled deployment and fixation, allowing for precise tissue fixation and stent placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional stent is used for tissue fastening, then the stent can be inserted into the body, but it cannot securely fasten biological tissues for bypass procedures
Solution Approach 1:
The stent is divided into functionally distinct segments: a dilating portion for creating and expanding the perforation pathway, an indwelled portion for securing within the tissue, and a through hole for instrument passage. This segmentation allows each part to perform its specific function effectively, enabling reliable tissue fastening while maintaining operational simplicity through specialized design of each segment.
Solution Approach 2:
The dilating portion is designed to perform preliminary dilation of the perforation before the stent is fully deployed. This preliminary action creates a expanded pathway that facilitates subsequent tissue fastening operations, allowing the stent to securely fasten tissues without requiring complex real-time manipulation during the bypass procedure.
2Adaptability or versatility
If the stent is designed with a through hole for instrument passage, then surgical instruments can be delivered through the stent, but the stent structure becomes more complex
Solution Approach 1:
The through hole is designed as a universal passage that can accommodate various surgical instruments including fastening tools, cutting devices, and other operative instruments. This single structural feature provides multi-functionality, allowing different instruments to be delivered through the same stent structure without requiring complex variations in design for each instrument type.
Solution Approach 2:
The through hole is positioned and oriented in a specific dimensional arrangement within the stent structure, allowing instruments to pass through from one dimension while maintaining stent integrity. This dimensional arrangement enables instrument delivery without requiring complex three-dimensional structural modifications, simplifying the overall stent design while preserving versatility.
3Ease of operation
If the dilating portion is used to penetrate biological tissues, then the stent can be deployed through the tissue, but tissue damage may occur
Solution Approach 1:
The dilating portion is designed with localized properties optimized for tissue interaction: its geometry and material characteristics are specifically tailored to create controlled dilation of the perforation while minimizing unnecessary tissue damage. This local quality optimization allows easy deployment through the tissue while reducing harmful effects to the surrounding biological structures.
Solution Approach 2:
The dilating portion converts the potential harm of tissue penetration into a beneficial expanded pathway. By controlling the dilation process, the stent creates a purposeful opening that facilitates deployment while the controlled nature of the dilation minimizes collateral tissue damage, transforming a potentially harmful penetration action into a beneficial controlled expansion.
4Reliability
If the indwelled portion is designed to remain in place, then the stent can maintain position during bypass procedures, but foreign material may be left in the body
Solution Approach 1:
The indwelled portion is designed with features that allow it to be extracted or removed from the body after serving its purpose during the bypass procedure. This extraction capability eliminates the harmful effect of permanent foreign material retention while maintaining position stability during the critical surgical operations, as the stent can be securely placed and then removed without leaving residue.
Solution Approach 2:
The stent system is designed with the capability to be discarded after use, allowing the indwelled portion to be removed from the body following the bypass procedure. This approach ensures that no foreign material remains in the body while maintaining position stability during the procedure, as the stent can be securely positioned and then safely removed without leaving harmful residue.
Data Source
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AI summary
The tissue fastening apparatus includes: a tissue fastening tool provided with a first tissue fixing section which is hooked onto a first biological tissue and a second tissue fixing section which is hooked onto a second biological tissue; a stent provided with a dilating portion having a diameter which increases from a front end to a rear end of the dilating portion, an indwelled portion which is connected the dilating portion, and a through hole which passes through the dilating portion and the indwelled portion in a longitudinal direction of the stent; and an applicator provided with a tubular puncturing tool in which the tissue fastening tool is inserted, a fastening tool pusher inserted into the puncturing tool to dispenses the tissue fastening tool inserted into the puncturing tool from a distal end of the puncturing tool, and a sheath into which the puncturing tool is inserted to shift the stent which is detachably disposed at the distal end of the sheath relative to the puncturing tool.