Hollow Stranded Wire Torque Transmission
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Solution Overview
Problem
Medical manipulation wire ropes require excellent torque transmittability and flexibility, but existing technologies often fall short in achieving sufficient rotational force transmission due to insufficient torque transmittability and inflexibility, particularly in medical devices with reduced diameters.
Innovation Solution
A hollow stranded wire line with a side wire or strand forming rate between 100% and 110% and flatness between 1.01 and 1.10, formed into a spiral shape, which enhances torque transmittability by reducing energy loss through increased friction and flexibility, allowing for efficient rotational force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the manipulation wire rope uses conventional structure, then it can transmit pushing and pulling force, but it has insufficient torque transmittability
Solution Approach 1:
The patent applies parameter changes by optimizing the forming rate of the side wire to a specific range (100-110%) and controlling the flatness ratio (1.01-1.10). These parameter adjustments enhance the spiral shape's ability to transmit torque while maintaining manufacturing feasibility through standardized forming processes.
Solution Approach 2:
The patent utilizes curvature by forming the side wire into a spiral shape with controlled flatness. The spiral configuration with specific geometric parameters creates friction between adjacent wires, thereby improving torque transmittability while preserving the flexible structure needed for medical applications.
2Ease of operation
If the diameter of the medical device is reduced, then it becomes more flexible, but torque transmittability deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the geometric parameters of the side wire, specifically the forming rate (100-110%) and flatness (1.01-1.10). These parameter optimizations enable small-diameter wire ropes to maintain both flexibility for navigation and sufficient torque transmittability for effective treatment operations.
Solution Approach 2:
The spiral shape with controlled flatness ratio creates optimal contact and friction between adjacent wires, enabling effective torque transmission even in reduced-diameter configurations. The curvature geometry maximizes surface contact area relative to the wire rope diameter.
3Reliability
If the side wire forming rate is increased beyond 110%, then torque transmittability improves, but the wire line becomes too rigid
Solution Approach 1:
The patent precisely defines the forming rate parameter within the range of 100-110% to achieve optimal balance. This parameter control ensures sufficient torque transmittability through enhanced spiral friction while preventing excessive rigidity that would compromise flexibility and ease of operation in medical procedures.
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
The hollow stranded wire line achieves superior torque transmittability and flexibility, facilitating effective rotational force transmission in medical instruments by optimizing the forming rate and flatness of the side wire or strand, thereby improving the overall performance in medical applications.
Implementation Method 1
enhances torque transmittability by reducing energy loss through increased friction
Data Source
AI summary
[Object] A hollow stranded wire line, for manipulation, having an excellent torque transmittability is provided.[Solution] A hollow stranded wire line 2 for manipulation is a hollow stranded wire line 2 that is advantageously used as a stranded wire line for manipulation in a medical instrument, and a side wire 4 or a side strand which is an outermost layer has a forming rate that is greater than 100% and not greater than 110%. The side wire 4 or the side strand having been formed has a spiral shape in which a flatness that is an aspect ratio obtained by a major axis being divided by a minor axis is preferably not less than 1.01 and preferably not greater than 1.10.