Endoscopic Tool Coil Sheath Segmentation for Torque and Axial Force
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Solution Overview
Problem
Endoscopic treatment tools with multi-strand coil sheaths face challenges in transmitting axial force effectively due to compressive resistance, leading to inadequate treatment and complex procedures, especially when adjusting the orientation of treatment parts within body cavities.
Innovation Solution
The tool combines a single-strand coil sheath for compressive resistance and a multi-strand coil sheath for higher rotation follow-up capability, with specific end connections to allow relative movement and rotation, optimizing torque transmission and preventing strain accumulation during meandering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-strand coil sheath is used to improve rotation follow-up capability, then rotational transmittance is improved, but compressive resistance decreases causing axial force loss
Solution Approach 1:
The coil sheath is segmented into multiple independent strands (first coil sheath with single wire, second coil sheath with multiple wires) that can move relative to each other axially. This segmentation allows each strand to contribute differently - the first strand provides compressive resistance while the second strand provides rotational transmittance, resolving the contradiction between axial force transmission and rotation follow-up capability.
Solution Approach 2:
The coil sheath structure is made dynamic by allowing axial relative movement between the first and second coil sheaths. This dynamic configuration enables the system to adapt during operation - maintaining compressive resistance when axial force is needed while allowing rotation when orientation adjustment is required, thus resolving the contradiction between force transmission and rotational capability.
2Force
If a single-strand coil sheath is used to improve compressive resistance, then axial force transmission is improved, but rotation follow-up capability decreases
Solution Approach 1:
The coil sheath is divided into functional segments - the first coil sheath (single wire) handles compressive resistance and axial force transmission, while the second coil sheath (multiple wires) handles rotational transmittance. This functional segmentation resolves the contradiction by assigning different capabilities to different segments that work together.
Solution Approach 2:
The coil sheath uses a composite structure combining single-wire and multi-wire configurations. This composite design integrates the compressive resistance properties of the single-wire first coil sheath with the rotational flexibility of the multi-wire second coil sheath, resolving the contradiction between axial force transmission and rotation follow-up capability.
3Ease of operation
If the coil sheath compresses in the axial direction during rotation, then rotational transmittance is improved, but axial force transmission decreases making treatment inadequate
Solution Approach 1:
The system dynamically manages the compression state through axial relative movement between coil sheath strands. During rotation, the second coil sheath can compress relative to the first, enabling rotational transmittance. During force transmission, the axial movement is constrained to maintain compressive resistance. This dynamic control ensures both rotation and treatment reliability without compromise.
Solution Approach 2:
By segmenting the coil sheath into first and second strands with different characteristics, the patent isolates the compression effect to the second strand during rotation, preventing overall axial compression that would compromise treatment reliability. The first strand maintains its compressive resistance independently, ensuring treatment adequacy is not compromised by rotational needs.
Data Source
AI summary
An endoscopic treatment tool includes: a treatment part which is adapted to conduct treatment of tissue within a body cavity; an operation part which is adapted to operate the treatment part; an operation shaft member which connects the treatment part and the operation part; and a coil sheath part through which the operation shaft member passes so that the operation shaft member is capable of forward or backward movement, in which: the coil sheath part comprises: a first coil sheath around which wire is helically wound; and a second coil sheath that has a lower compressive resistance than the first coil sheath, and that has a higher rotation follow-up capability than the first coil sheath; the first coil sheath and the second coil sheath are disposed so as to coaxially and radially overlap; a first end part and a second end part of the second coil sheath are respectively connected to the treatment part and the operation part so as to be incapable of relative rotation around an axis of the second coil sheath; and at least one of the first end part and the second end part is capable of relative movement in an axial direction with respect to the first coil sheath.