Endoscope Forceps Half-Open State Control via Link Mechanism
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Solution Overview
Problem
Conventional endoscope forceps struggle to achieve a precise half-open state, requiring delicate manipulation and being influenced by the curved or loop shape of the sheath, which affects the consistency of full-open and half-open states.
Innovation Solution
Incorporating a pair of jaw members supported by a pivot shaft, an opening and closing wire, an adjusting member, and an adjusting wire, which allows for controlled rotation and adjustment of the jaw members' angle through a sheath, enabling easy and accurate half-opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the operating wire is moved forward and backward to adjust the opening and closing state of the forceps member, then the forceps can be opened or closed, but the operating wire may not be moved forward and backward by a desired amount due to the curved or loop shape of the sheath, making it difficult to achieve a precise half-open state
Solution Approach 1:
The patent introduces a link mechanism as an intermediary between the operating wire and the forceps members. This link mechanism includes link members that convert the linear motion of the operating wire into rotational motion of the forceps members about the rotary shaft, enabling precise control of the opening and closing state regardless of the sheath's curved or loop shape.
Solution Approach 2:
The patent replaces the direct mechanical connection between the operating wire and forceps members with a rotary shaft mechanism. Instead of directly moving the forceps members linearly, the operating wire rotates the forceps members about a rotary shaft through link members, achieving more precise and reliable control of the opening and closing state.
2Adaptability or versatility
If the forceps members are made to be relatively rotatable about a rotary shaft, then the forceps can be opened and closed, but it is difficult to achieve a half-open state without delicate manipulation of the operating section
Solution Approach 1:
The patent makes the forceps members dynamically adjustable by connecting them to the operating wire through link members that rotate about a rotary shaft. This dynamic mechanism allows the forceps members to be easily adjusted to various opening and closing states, including half-open states, without requiring delicate manipulation, while maintaining adaptability to various tissue shapes and thickness.
Data Source
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AI summary
A forceps for endoscope includes: a pair of first and second forceps members that is supported by a forceps rotary shaft(23) so as to be relatively rotatable; an opening and closing wire(30) that is moved forward and backward in the direction of the axis O so that the first forceps member(21) and the second forceps member(22) are rotated relatively; a stopper(60) that switches an angle in which the first forceps member(21) and the second forceps member(22) rotate relatively at first and second positions different from each other in the direction of the axis O; an adjusting wire(70) is moved forward and backward in the direction of the axis O so that the stopper(60) moves between the first position and the second position; and a sheath(40) through which the opening and closing wire(30) and the adjusting wire(70) are inserted and in which the first forceps member(21), the second forceps member(22), and the stopper(60) protrude from the front end thereof.