Semi-tubular Device Guide for Intravascular Procedures
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Solution Overview
Problem
Interventional cardiology procedures face challenges in inserting guidewires and balloon catheters into coronary arteries with tight curves or narrowing due to resistance issues, which can dislodge guide catheters from the ostium, making it difficult to complete procedures.
Innovation Solution
A semi-tubular device guide is inserted through the guide catheter, with a distal portion that occupies less space and features a radial opening, allowing intravascular devices to be directed accurately and reducing backward force, enabling easier insertion and maintaining blood flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a balloon catheter is inserted into a tightly curved or narrowed coronary artery, then the device can reach the treatment site, but the backward force exerted on the guide catheter may dislodge it from the ostium
Solution Approach 1:
A coaxial guide catheter is introduced as an intermediary device between the guide catheter and the balloon catheter. This intermediate structure provides additional support and guidance, allowing the balloon catheter to navigate tightly curved or narrowed coronary arteries while the coaxial guide catheter absorbs and distributes the backward forces, preventing dislodgement of the original guide catheter from the ostium
Solution Approach 2:
The coaxial guide catheter is nested within the lumen of the guide catheter, with its distal end extending beyond the guide catheter's distal end into the branch artery. This nested configuration allows the inner coaxial guide catheter to provide structural support and force distribution while the outer guide catheter maintains its positioning function, creating a layered support system that resolves the contradiction between device insertion ease and guide catheter stability
2Reliability
If a coaxial guide catheter is used to resist axial and shear forces, then the guide catheter remains stable, but the device complexity increases
Solution Approach 1:
The coaxial guide catheter is designed to perform multiple functions simultaneously: it provides structural support to resist axial and shear forces, guides the interventional device through the lumen, and extends into the branch artery to facilitate device delivery. By consolidating these multiple functions into a single device, the system achieves improved stability without proportionally increasing overall complexity
Data Source
AI summary
A method for performing an intravascular procedure includes inserting a guide catheter into a blood vessel, and passing a device guide through the guide catheter so that a distal portion of the device guide, having a semi-tubular shape, protrudes from a distal end of the guide catheter into the blood vessel. An intravascular device is inserted through the guide catheter via the distal portion of the device guide to a target site in the blood vessel.