Catheter Reinforcement Coil Positioning for Anti-Kink and Sensor Interference
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Solution Overview
Problem
Catheters with coils exposed inside the working lumen can interfere with sensors during bending, leading to kinking issues and safety concerns when used for diagnostic procedures like ultrasound or optical coherence tomography.
Innovation Solution
A catheter design featuring a reinforcement portion with a coil portion positioned outside the lumen, using an element wire wound in a spiral shape with an extension portion that reduces exposure and improves anti-kink properties by being placed between the inner and outer surfaces of the catheter main body, ensuring the coil is not exposed inside the lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a coil is provided inside the catheter to improve anti-kink property, then the anti-kink property is improved, but the coil interferes with sensors when the catheter is bent
Solution Approach 1:
The coil is extracted from the interior of the catheter lumen and repositioned to the exterior surface. The reinforcement portion including the coil is covered by a covering member that extends from the catheter body, effectively removing the coil from the internal space where sensors operate while preserving its external reinforcement function for anti-kink properties.
Solution Approach 2:
The catheter structure is segmented into distinct functional zones: the internal lumen area for sensor passage, the external reinforcement area with the coil, and the covering member that separates these zones. This segmentation allows the coil to provide reinforcement externally without interfering with internal sensor operations.
2Stability of the object's composition
If a reinforcement portion with coil is provided to improve anti-kink property, then the anti-kink property is improved, but the complexity of the catheter structure increases
Solution Approach 1:
The covering member is merged with the catheter body structure, extending continuously from the catheter to cover the reinforcement portion. This integration reduces the number of separate components and simplifies the overall structure while still providing the necessary coverage to prevent coil interference.
Solution Approach 2:
The covering member serves multiple functions: it protects the coil from interfering with sensors, provides structural support to the catheter, and maintains the integrity of the lumen. By combining multiple functions into a single component, the overall device complexity is reduced.
Data Source
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AI summary
There is provided a catheter which has an excellent anti-kink property and also in which there can be prevented interference with respect to the object which moves inside the lumen. The catheter 1 of the present invention is characterized by including: a catheter main body 2 which forms a lengthy shape and also includes a lumen 21 extending along the longitudinal direction; a guide wire insertion portion 3 which is placed on the distal side of the catheter main body 2 and forms a tubular shape through which a guide wire 20 is insertable, and which includes a distal opening portion 37 and a proximal opening portion 36 ; and a reinforcement portion 22 provided with a coil portion 221 in which at least a portion thereof is arranged on the proximal side away from the proximal opening portion 36 and is wound by using an element wire, and an extension portion 222 formed by being expanded from the element wire of the coil portion 221 to the distal side away from the proximal opening portion 36, wherein the reinforcement portion 22 is positioned between the inner surface and the outer surface of the lumen 21 of the catheter main body 2.