Multi-Wire Coil Sheath Torque Transmission
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Solution Overview
Problem
Existing endoscope treatment devices face challenges in maintaining effective torque transmissibility and force transmission due to compression-induced displacement of element wires in multi-wire coil sheaths, leading to unsatisfactory treatment procedures.
Innovation Solution
The treatment device incorporates a multi-wire coil sheath with strategically placed fixing portions formed by laser welding, which regulate relative movements between element wires, ensuring balanced resistance to compression and high torque transmissibility, thereby preventing excessive shrinkage and enhancing force transmission to the treatment part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a multi-wire coil sheath is used to provide high torque transmissibility, then rotation transmissibility is improved, but compression causes displacement of element wires reducing axial force transmission
Solution Approach 1:
The coil sheath is segmented into multiple independent element wires (first through fourth wires) instead of using a solid or single-wire construction. This segmentation allows each wire to independently bear compressive loads while maintaining collective torque transmissibility, preventing the displacement issues that would occur in a monolithic structure.
Solution Approach 2:
The coil sheath employs a composite structure combining multiple different wires (first wire, second wire, third wire, fourth wire) with potentially different material properties or structural characteristics. This composite construction enables the sheath to simultaneously achieve high torque transmissibility through the multi-wire configuration and resistance to compression through the collective structural integrity of the combined wires.
2Ease of operation
If the coil sheath is compressed in the axial direction to transmit opening/closing forces, then treatment part actuation is enabled, but torque transmissibility is reduced
Solution Approach 1:
The coil sheath is designed with dynamic characteristics that allow it to adapt its mechanical properties based on the type of load applied. When axial compression is applied for opening/closing operations, the sheath compresses to transmit the force. When rotational torque is applied for orientation adjustment, the multi-wire structure maintains high torque transmissibility. This dynamic response enables both treatment part actuation and rotation without permanent degradation of either function.
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
This configuration allows for efficient rotational adjustment and force transmission to the treatment part, improving the endoscope's ability to perform procedures with high torque transmissibility and reduced diameter, while minimizing wire slippage and displacement.
Implementation Method 1
a plurality of the fixing portions that is arranged between a distal end and a proximal end of the multi-wire coil sheath and regulates a first relative movement between the plurality of element wires and a second relative movement between parts of the wire bundle that are adjacent to each other as being spirally wound
Data Source
AI summary
Disclosed is a treatment device for an endoscope including a treatment part that is adapted to treat tissue within a body cavity, a manipulating part that is adapted to manipulate the treatment part, a manipulation shaft member that connects the treatment part and the manipulating part, a multi-wire coil sheath that is formed by spirally winding a wire bundle having a plurality of element wires arranged in a longitudinal direction, and a plurality of fixing portions that is arranged between a distal end and a proximal end of the multi-wire coil sheath and restricts a first relative movement between the plurality of element wires and a second relative movement between parts of the wire bundle that are adjacent to each other as being spirally wound. The manipulation shaft member is inserted into the multi-wire coil sheath so that the manipulation shaft member is capable of being advanced and retracted.