Endoscope Forceps Cover Member Restricting Rotation Axis Movement
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Solution Overview
Problem
Conventional endoscope treatment tools face difficulties in stable opening and closing of forceps members due to obstruction by rotation axis members, leading to impaired insertability and functionality within body cavities.
Innovation Solution
The design incorporates a cover member with restricting parts that prevent rotation axis members from moving towards the operation wire axis, ensuring smooth opening and closing of forceps members by engaging with the rotation axis members and allowing flexible deformation of the insertion part for improved insertability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotation axis members are allowed to move freely, then the forceps members can open and close, but the rotation axis members obstruct the operation wire axis and cause unstable operation
Solution Approach 1:
The cover member acts as an intermediary component that mediates between the rotation axis members and the operation wire axis. It provides restricting parts that selectively constrain the rotation axis members to prevent them from obstructing the operation wire axis, while still allowing the forceps members to open and close properly.
2Stability of the object's composition
If the insertion part is made rigid for structural stability, then the forceps members are supported well, but the insertability into endoscope channels is impaired
Solution Approach 1:
The insertion part is segmented into a rigid distal portion that supports the forceps members and a flexible proximal portion that enables insertability. This segmentation allows different parts of the insertion part to have different mechanical properties, combining structural stability with flexibility for insertion.
3Area of stationary object
If the rotation axis members are positioned closer to the operation wire axis, then the forceps members can operate with smaller clearance, but they obstruct the operation wire axis and cause unstable operation
Solution Approach 1:
The restricting parts on the cover member apply preliminary constraining action on the rotation axis members to prevent them from moving toward the operation wire axis and causing obstruction. This preventive measure ensures stable operation before any problematic movement can occur.
Data Source
AI summary
A treatment tool for endo scope includes a pair of forceps members (first forceps members and second forceps member) supported by a forceps rotation axis such that they can rotate relatively, an operation part for performing an open-close operation of the pair of forceps members, an operation wire that connects the pair of forceps members and the operation part, an insertion part which the operation wire is inserted into, a cover member that secures the forceps rotation axis to the insertion part, a connection member including a link rotation axis, provided at a distal-end part of the operation wire, and a pair of link members (first link member and second link member), first end parts of each being rotatably connected via respective rotation axis members to a proximal-end part of each of the pair of forceps members, and second end parts of each being rotatably connected to the link rotation member. The cover member includes grooves formed such that, by engaging with end parts of the rotation axis members, they restrict the movement of the rotation axis members in a direction of approaching the axis of the operation wire.