Multi-Angulated Catheter Radial Access Design
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Solution Overview
Problem
Current pigtail catheters are challenging to insert into the left ventricle using the radial approach due to unfavorable aortic angles, making it difficult to access the left ventricle effectively during cardiac ventriculography.
Innovation Solution
A multi-angulated catheter design with angles ranging from 105 to 140 degrees and additional angles at various distances from the tip, allowing the catheter to be flexible for guide wire advancement and returning to a multi-angulated position post-withdrawal, facilitating access from the arm of a patient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard pigtail catheters with straight or single-angle designs are used, then manufacturing and design are simple, but they are difficult to insert into the left ventricle using the radial approach due to unfavorable aortic angles
Solution Approach 1:
The catheter is divided into multiple segments with different angulations (first shaft at first obtuse angle, second shaft at second obtuse angle) to navigate the complex anatomical path from radial artery through aorta to left ventricle, resolving the contradiction between operational ease and device complexity
Solution Approach 2:
Different portions of the catheter are given different angular characteristics (first obtuse angle of 105-140 degrees, second obtuse angle of 105-140 degrees) to match specific anatomical requirements at different locations along the insertion path, improving ease of operation while maintaining manageable complexity
2Ease of operation
If the catheter is made flexible to be straightened over guide wire, then ease of insertion is improved, but the catheter must return to multi-angulated position after guide wire withdrawal which adds operational complexity
Solution Approach 1:
The catheter transitions from a static multi-angulated design to a dynamic structure that can be temporarily straightened during guide wire advancement and automatically returns to its multi-angulated configuration after guide wire removal, resolving the contradiction between advancement ease and positional control complexity
Solution Approach 2:
The catheter's angular parameters are changed temporarily during insertion (straightened over guide wire) and then restored to original multi-angulated configuration, allowing easy advancement while maintaining the ability to return to the optimized angular position for ventricle access
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
The multi-angulated catheter design enhances the ability to access the left ventricle from the radial approach, improving the efficiency and effectiveness of cardiac ventriculography by allowing precise positioning and filling of the ventricle with radiopaque dye.
Implementation Method 1
The multi-angulated catheter is flexible so as to afford being straightened when it is advanced over a guide wire. The multi-angulated catheter returns to a multi-angulated position after the guide wire is withdrawn.
Data Source
AI summary
The present invention is directed to a multi-angulated catheter and methods of using the multi-angulated catheter. The multi-angulated catheter is so dimensioned as to facilitate accessing the left ventricle from an arm of a patient. The multi-angulated catheter generally includes in order: (a) a coiled end; (b) a first straight portion having a first straight portion length; (c) a first shaft including a distal end connected to the first straight portion and a proximal end opposite the distal end, the first shaft and the first straight portion defining a first obtuse angle, the first shaft having a first shaft length; and (d) a second shaft connected to the first shaft on said proximal end. The catheter is flexible so as to afford being straightened when it is advanced over a guide wire. The catheter resiliently returns to a multi-angulated position after the guide wire is withdrawn.