Endoscopic Collecting Basket With Double-Lumen Tube
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Solution Overview
Problem
Existing endoscopic devices face difficulties in navigating narrow bile and pancreatic ducts and effectively removing gallstones due to the obstruction caused by guide wires, which hinder the rotation and expansion of the collecting basket.
Innovation Solution
A double-lumen tube design with a guide wire in one lumen and the collecting basket in another, allowing the guide wire to extend beyond the tube for precise placement and enabling the collecting basket to rotate freely without obstruction, along with a spherical outer contour for unimpeded movement and a cartridge-shaped guide element for atraumatic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide wire is used to navigate narrow bile and pancreatic ducts, then precise placement is improved, but the guide wire obstructs the rotation and expansion of the collecting basket
Solution Approach 1:
The device is divided into two separate lumens within the tube: the first lumen accommodates the cable for basket control, while the second lumen accommodates the guide wire. This segmentation allows both the guide wire and collecting basket to function independently without interfering with each other, resolving the obstruction problem while maintaining precise placement capability
Solution Approach 2:
The guide wire is positioned in a second lumen that is spatially separated from the first lumen containing the cable and basket mechanism. This dimensional separation in the longitudinal axis of the tube allows the guide wire to extend beyond the tube for precise placement while the basket can rotate and expand in its own spatial domain without obstruction
2Reliability
If the collecting basket is designed to rotate approximately 130° for effective stone capture, then stone capture effectiveness is improved, but the device complexity increases
Solution Approach 1:
The collecting basket is designed with dynamic rotational capability of approximately 130° that is actuated by the cable running through the first lumen. This dynamic rotation allows the basket to adapt its orientation for effective stone capture while the double-lumen tube design manages the cable routing to achieve this motion without excessive device complexity
Solution Approach 2:
The cable is nested within the first lumen of the double-lumen tube, and the guide wire is nested within the second lumen. This nested configuration allows both control elements to be integrated within the tube structure while maintaining the rotational freedom of the basket, balancing functionality with device simplicity
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
Enables successful capture and removal of gallstones by allowing the collecting basket to rotate approximately 130° and expand without hindrance, ensuring effective stone capture and extraction without damaging surrounding tissues.
Implementation Method 1
said cable comprising on a distal end, a collecting basket formed by at least four elastic basket wires... upon an axial displacement of the cable, to a loop-like contraction or expansion of the collecting basket and to a twisting of the collecting basket
Data Source
AI summary
A device (1) for endoscopic removal of stones or concrements from a bile and pancreatic duct or foreign bodies and polyps subsequent to polypectomy in the upper or lower gastrointestinal tract comprises a cable (9) guided in a tube (2) and further comprises, on its proximal end, an actuation element (3) for an axial displacement of the cable (9) within the tube (2). The cable (9) receives, on its distal end, a collecting basket (16) formed by at least four elastic basket wires (17), said basket wires (17) being bundled at one end on the cable (9) and at another end on a guide element (18). The basket wires (17) bear against the end of the tube (2) such that an axial displacement of the cable (9) leads to a loop-like contraction or expansion of the collecting basket (16) and to a twisting of the collecting basket (16) about its longitudinal axis. The tube (2) is configured as a double-lumen tube, the cable (9) being arranged in a first lumen (8) and a guide wire (5) being arranged in a second lumen (19), and a distal end of the guide wire (5) extending axially beyond the tube (2) is not guided relative to the collecting basket (16).