Medical Guide Wire Double Coil Rotation Transmission
Solution Overview
Problem
Existing medical guide wires face challenges in effectively navigating tortuous blood vessels and vascular branches due to limitations in rotation transmission capability and plastic deformation properties, particularly in improving selection capability and passing through lesions.
Innovation Solution
The guide wire design features synchronized winding directions for inner and outer coils, specific coil pitch ratios, and varying diameter portions to enhance rotation transmission and plastic deformation, preventing strand engagement during bending, and optimizing torsional moments for improved navigation and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide wire uses a double coil structure with inner and outer coils, then the rotation transmission capability is improved, but the plastic deformation properties deteriorate
Solution Approach 1:
The patent applies local quality by creating space wound portions at specific locations (distal ends) of the inner and outer coils, while maintaining close wound portions in other areas. This localized modification allows the distal end to have enhanced plastic deformation capability without compromising the overall rotation transmission function of the double coil structure.
Solution Approach 2:
The patent segments the coil structure into distinct functional zones: close wound portions for maintaining structural integrity and rotation transmission, and space wound portions for enabling plastic deformation. This segmentation allows different parts of the same component to serve different functions, resolving the contradiction between rotation transmission and deformation capability.
2Adaptability or versatility
If the coil pitch is increased to improve flexibility, then the plastic deformation properties are improved, but the rotation transmission capability deteriorates
Solution Approach 1:
The patent applies local quality by creating space wound portions at specific locations (distal ends) of the inner and outer coils, while maintaining close wound portions in other areas. This localized modification allows the distal end to have enhanced plastic deformation capability without compromising the overall rotation transmission function of the double coil structure.
Solution Approach 2:
The patent segments the coil structure into distinct functional zones: close wound portions for maintaining structural integrity and rotation transmission, and space wound portions for enabling plastic deformation. This segmentation allows different parts of the same component to serve different functions, resolving the contradiction between rotation transmission and deformation capability.
3Ease of operation
If the guide wire is made more flexible to navigate tortuous vessels, then the selection capability is improved, but the rotation transmission capability deteriorates
Solution Approach 1:
The patent applies local quality by creating space wound portions at specific locations (distal ends) of the inner and outer coils, while maintaining close wound portions in other areas. This localized modification allows the distal end to have enhanced plastic deformation capability without compromising the overall rotation transmission function of the double coil structure.
Solution Approach 2:
The patent segments the coil structure into distinct functional zones: close wound portions for maintaining structural integrity and rotation transmission, and space wound portions for enabling plastic deformation. This segmentation allows different parts of the same component to serve different functions, resolving the contradiction between rotation transmission and deformation capability.
Data Source
AI summary
An outer coil (13) and an inner coil (14) are joined in parallel with a distal end portion of a core (11) of a guide wire (10). A winding direction of a strand (8) of the outer coil (13) is the same as that of a strand (9) of the inner coil (14). Diameters of the outer and inner coils (13, 14) increase or decrease when rotation of the core (11) is transmitted and thereby rotation transmission capability is improved. An outer space wound portion (13A) and an inner space wound portion (14A) are formed in corresponding positions in the outer coil (13) and the inner coil (14), respectively, in a core direction. Even if the guide wire (10) has a double-coil structure, the outer and inner space wound portions (13A, 14A) improve flexibility of the guide wire (10). A coil pitch of the outer space wound portion (13A) differs from a coil pitch of the inner space wound portion (14A). Thereby, engagement of the strands (8, 9) is prevented.