Multilayer Catheter Shaft Structure for Bidirectional Torque Transmission
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Solution Overview
Problem
Conventional multilayer catheters exhibit insufficient rotational torque transmissivity when one end is rotated, due to small stranding angles of stranded wires, which affects the efficiency of torque transmission in both multilayer bodies and catheters using such structures.
Innovation Solution
A catheter design featuring a multilayer hollow body composed of a single-stripe hollow body wound by one element wire, an inner multi-stripe hollow body wound by multiple wires in one direction, and an outer multi-stripe hollow body wound by multiple wires in the opposite direction, enhancing rotational torque transmissivity by adjusting the twisting angles and adhesion between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If stranded wires are arranged in multiple layers around a core wire with small stranding angles, then the multilayer body structure is compact and manageable, but the rotational torque transmissivity to the other end becomes insufficient
Solution Approach 1:
The patent applies the inversion principle by winding the inner multi-stripe hollow body and outer multi-stripe hollow body in opposite directions to the single-stripe hollow body. This creates opposing rotational forces that enhance torque transmission efficiency while maintaining structural compactness, directly resolving the contradiction between manageable structure and sufficient torque transmissivity
Solution Approach 2:
The patent employs composite structural design by combining three different hollow body types (single-stripe and two multi-stripe varieties) with different winding directions and characteristics into a unified multilayer catheter structure. This composite approach allows optimization of both structural compactness and rotational torque transmissivity through the synergistic interaction of different layer properties
2Reliability
If the stranding angle of stranded wires is increased to improve torque transmission, then rotational torque transmissivity improves, but the multilayer body structure becomes less compact and more difficult to manage
Solution Approach 1:
The patent segments the catheter structure into three distinct hollow body layers, each with specific winding characteristics. This segmentation allows each layer to contribute differently to torque transmission while collectively maintaining structural compactness, avoiding the need for high stranding angles in a single layer
Solution Approach 2:
By winding adjacent layers in opposite directions, the patent achieves enhanced torque transmission without requiring large stranding angles. The opposing windings create mechanical interlocking that improves torque transmissivity while keeping the overall structure compact and manageable
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 design significantly improves rotational torque transmissivity to the distal end of the catheter by optimizing the twisting angles and adhesion between layers, ensuring effective torque transmission in both clockwise and counterclockwise rotations.
Implementation Method 1
when one end of the catheter is rotated rightward and leftward, it is possible to improve rotational torque transmissivity to the other end of the catheter
Data Source
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AI summary
To provide a catheter including a multilayer body, a multilayer hollow body, and a catheter with a multilayer hollow body having improved torque transmissivity to the other end when one end is rotated rightward and leftward. A multi-stripe hollow body 1 includes a single-stripe hollow body 7 that is wound by one element wire, an inner multi-stripe hollow body 3 that is disposed adjacently to an inner periphery of the single-stripe hollow body 7 and wound by a plurality of element wires in an opposite direction from the single-stripe hollow body 7, and an outer multi-stripe hollow body 5 that is disposed adjacently to an outer periphery of the single-stripe hollow body 7 and wound by a plurality of element wires in an opposite direction from the single-stripe hollow body 7.