Rotatable Coil Guide Wire Axial Alignment
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Solution Overview
Problem
Existing guide wires face issues with axial misalignment between the wire main body and the secondary coil, leading to poor operability, especially in steeply curved or stenosed blood vessels.
Innovation Solution
A guide wire design featuring a rotatable tubular portion with a support structure that prevents radial misalignment between the tubular portion and the wire main body, allowing for rotational operation even if the tubular portion is caught by a stenosed site, and includes a flexible wire main body with tapered sections for improved flexibility and a hydrophilic lubricant layer to reduce sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the secondary coil is disposed freely on the wire main body without fixation, then the coil can rotate independently to avoid being caught by stenosed sites, but axial misalignment occurs between the wire main body and the coil leading to poor operability
Solution Approach 1:
The support structure is divided into multiple engagement portions along the axial direction, creating segmented support points that collectively maintain coil position while allowing rotational movement. This segmentation enables the coil to rotate freely without compromising axial alignment.
Solution Approach 2:
The support structure acts as an intermediary element between the wire main body and the secondary coil. It provides the necessary support to prevent axial misalignment while simultaneously allowing rotational movement, thus mediating between the conflicting requirements of alignment precision and rotational freedom.
2Manufacturing precision
If the coil is fixed to the wire main body, then axial alignment is maintained, but the coil cannot rotate independently when caught by stenosed sites
Solution Approach 1:
The support structure provides dynamic support that adapts to operational needs. It maintains axial alignment through engagement portions while allowing rotational movement when the coil encounters stenosed sites. The support structure transitions from a static fixed connection to a dynamic system that permits controlled rotation.
3Ease of operation
If a support structure is added to prevent axial misalignment, then operability is improved, but the device complexity increases
Solution Approach 1:
The support structure is designed as a thin-walled cylindrical tube that provides necessary structural support while maintaining flexibility. This thin-film approach prevents axial misalignment without adding excessive complexity, as the simple tubular form with engagement portions can be easily manufactured and integrated.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A guide wire 1 according to the present invention includes a flexible wire main body 11, a coil 5 that is intermediately disposed in a longitudinal direction of the wire main body 11 in an outer periphery of the wire main body 11, and a support portion 7 that supports at least one of a distal end and a proximal end of the coil 5 so as to be rotatable around a central axis O of the wire main body 11. In addition, in a natural state where an external force is not supplied to the guide wire 1, the support portion 7 supports in a state where an inner peripheral portion 51 of the coil 5 and an outer peripheral portion 111 of the wire main body 11 are separated from each other.