Loop Wire Tissue Grasping Tool for Necrosectomy
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Solution Overview
Problem
Existing tissue grasping tools for endoscopic necrosectomy, such as cup-type and basket-type forceps, face challenges in efficiently and reliably grasping and removing necrotic tissue from the pancreas without damaging surrounding tissues or blood vessels.
Innovation Solution
A tissue grasping tool with a treatment section featuring loop-shaped wire members that can be manipulated to alternately push and pull tissue, allowing for secure grasping and retrieval of necrotic tissue without biting or cutting, utilizing a mechanism where loop sections can retractably protrude and change diameter to accommodate tissue size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If cup-type forceps with two sets of members are used to strongly pinch tissue, then tissue grasping force is improved, but risk of damaging surrounding tissues or blood vessels increases
Solution Approach 1:
The forceps is divided into multiple independent members (first member with first loop, second member with second loop, third member with third loop) that can operate independently or in combination. This segmentation allows distributed tissue engagement, reducing concentrated stress on any single point and minimizing damage to surrounding structures while maintaining effective grasping force on the target tissue.
2Reliability
If basket-type forceps with four elastic wires are used to reliably hold culculus, then tissue holding reliability is improved, but adaptability to different tissue sizes decreases
Solution Approach 1:
The forceps employs dynamic loop structures that can change their configuration and effective diameter. The loops can be opened and closed independently, and their engagement depth can be adjusted, allowing the same forceps to adapt to various tissue sizes while maintaining reliable holding through the elastic deformation of the wire members.
Solution Approach 2:
The forceps utilizes changes in geometric parameters (loop opening angle, engagement depth, effective diameter) to adapt to different tissue sizes. By varying these parameters through manipulation of the members, the forceps can reliably grasp small or large tissue pieces without requiring multiple specialized instruments.
3Adaptability or versatility
If loop sections are designed to retractably protrude to accommodate tissue size, then adaptability to different tissue sizes is improved, but device complexity increases
Solution Approach 1:
The retraction mechanism is merged with the manipulation member structure itself. The loops are formed as integral parts of the wire members, and their retraction is achieved through the natural elastic deformation and pivoting action of the same members used for opening and closing, eliminating the need for separate retraction mechanisms and reducing overall device complexity.
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
Enables efficient and reliable grasping and removal of necrotic tissue with reduced risk of damage to surrounding tissues or blood vessels, allowing for effective necrosectomy procedures.
Implementation Method 1
a first wire-shaped member protruding from the first member and being formed a first loop; and a second wire-shaped member protruding from the second member and being formed a second loop
Data Source
AI summary
A tissue grasping tool includes: a longitudinal-axis member; a first member and second member; a manipulation member; a first wire-shaped member protruding from the first member and being formed a first loop; and a second wire-shaped member protruding from the second member and being formed a second loop; the first wire-shaped member and the second wire-shaped member extend in a direction which gradually approaches with each other as it goes toward the distal side from a proximal side of the first and second loops; in a state of which the first member and the second member come close with each other, the second wire-shaped member passes through an inside of the first loop; and a distance between distal end portions of the first and second loops is increased according to an operation in which the first member and the second member approach.