Basket Catheter Torque Transmission via Hollow Coil Inner Tube
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional basket catheters face challenges in rotating and maintaining a desired angle within body lumens, especially in meandering shapes, due to wire contact with endoscope walls or outer tube squashing, leading to impaction issues during calculus capture and removal, prolonging operative time and invasive procedures.
Innovation Solution
A basket catheter design featuring a hollow coil body with spirally wound wires and a tubular connector facilitates torque transmission and includes an auxiliary treatment instrument lumen for improved maneuverability and minimally invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wire members are used to connect the basket part to the handle, then torque can be transmitted to rotate the basket part, but the wire members come into contact with the inner wall of the endoscope or outer tube in meandering lumens, preventing desired rotation and causing impaction
Solution Approach 1:
The catheter is divided into distinct segments: an outer tube for delivery, an inner tube for torque transmission, and a basket part for capture. This segmentation allows each component to perform its specific function independently, with the inner tube transmitting torque while the outer tube provides structural support and protection, preventing impaction in meandering lumens
Solution Approach 2:
The inner tube is nested within the outer tube, creating a concentric structure. This nested configuration allows the inner tube to transmit rotational torque to the basket part while the outer tube maintains structural integrity and prevents the inner tube from contacting the endoscope wall, eliminating the impaction problem
2Device complexity
If the basket wires are disposed axially in parallel (proximal to distal), then the structure is simple, but the wires are disproportionately disposed on the outside of bending ducts, impeding retention of expanded state and causing impaction
Solution Approach 1:
The basket part is designed to dynamically adapt to the duct geometry. When the catheter navigates a bending duct, the basket wires naturally redistribute themselves, with more wires positioned on the inner side of the bend. This dynamic redistribution maintains the expanded state and prevents impaction, eliminating the need for complex pre-positioning of wires
3Adaptability or versatility
If the outer tube lumen is squashed by acute angles in meandering lumens, then the catheter can navigate the lumen, but the operation wire or proximal end part is trapped, preventing rotation and prolonging operative time
Solution Approach 1:
The catheter structure is segmented into an outer tube for navigation and an inner tube for torque transmission. When the outer tube is squashed by acute angles, only the outer tube deforms while the inner tube maintains its structural integrity and continues to transmit rotational torque, preventing impaction and eliminating the need for time-consuming removal procedures
Solution Approach 2:
The inner tube acts as an intermediary between the handle and the basket part. It transmits rotational torque through the deformed outer tube without being affected by the squashing, maintaining the ability to rotate the basket part even when the outer tube is compressed by acute angles in meandering lumens
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
Enhances rotational torque transmission to the basket part, prevents impaction, and increases operative options by allowing for easier capture and removal of foreign matter, promoting more efficient and minimally invasive treatments.
Implementation Method 1
The inner tubular member includes a hollow coil body formed of a wire wound spirally. In the basket catheter according to the present invention, the inner tubular member disposed on the proximal side of the basket part includes the hollow coil body formed of the wire wound spirally, thus facilitating transmission of torque at a hand side to the basket part
Data Source
AI summary
The present invention aims to provide a basket catheter that easily transmits rotational torque on a proximal side to a basket part and can remove a captured foreign matter. The basket catheter (1) has a distal side and a proximal side, has an outer tubular member (2), an inner tubular member (3) disposed in a lumen of the outer tubular member (2) and an expandable basket part (10) disposed on the distal side of the inner tubular member (3) and including elastic wires (15). The inner tubular member (3) includes a hollow coil body (4) formed of a wire wound spirally. In the above basket catheter (1), the elastic wires (15) and the inner tubular member (3) are preferably connected together through a tubular connector (20).