LIMA Crossover Catheter Geometry for Right-Radial Cannulation
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Solution Overview
Problem
Current methods for LIMA cannulation from a right transradial approach are technically challenging and lack a uniform, efficient method to engage the LIMA graft, particularly due to varying aortic arch geometries, leading to a high learning curve and suboptimal catheter selection.
Innovation Solution
An integrated two-part catheter system comprising a guide catheter with a deliberately shaped outer sheath and an inner sheath, designed to engage the LSCA from a right transradial approach, allowing for efficient cannulation of the LIMA graft by navigating through the right subclavian artery and aortic arch, with the inner sheath telescoping to engage the LIMA ostium without the need for guide wire exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard catheters are used for LIMA cannulation from right radial approach, then the procedure can be performed with available equipment, but the technical difficulty increases and procedural efficiency decreases due to multiple catheter exchanges and trial-and-error selection
Solution Approach 1:
The catheter system is divided into multiple functional segments: a guide catheter with specific curve geometry for navigating the aortic arch, an inner catheter for final LIMA engagement, and integrated features that allow sequential deployment without complete catheter exchange. This segmentation allows each part to be optimized for its specific function while working together as a coordinated system.
Solution Approach 2:
The guide catheter is pre-shaped with a specific curve geometry designed to match the aortic arch anatomy, allowing it to be advanced through the right radial approach and engage the LSCA without requiring multiple trial catheters. The pre-configured shape performs the navigation function in advance, eliminating the need for operator trial-and-error during the procedure.
2Adaptability or versatility
If multiple catheter selections are tried to match patient's aortic geometry, then a suitable catheter curve can be found, but the procedural time increases and efficiency decreases
Solution Approach 1:
The guide catheter is designed with a universal curve geometry that can accommodate various aortic arch types (Types I, II, and III). The specific curve configuration with defined radius and angle allows a single catheter design to function effectively across different patient anatomies, eliminating the need for multiple specialized catheter selections.
Solution Approach 2:
The catheter design incorporates specific geometric parameters (curve radius, angle of engagement) that can be adjusted or selected based on the patient's aortic geometry. This allows optimization of the catheter's shape parameters to match the specific anatomical variant, providing adaptability without requiring complete catheter exchange.
3Reliability
If right radial approach is used for LIMA cannulation, then patient safety is improved compared to transfemoral approach, but the procedural difficulty increases due to limited torque response and multiple contact points
Solution Approach 1:
The catheter incorporates curved sections with specific radii of curvature designed to navigate the tortuous path from the right radial artery through the subclavian and aortic arch to the LSCA. The curved geometry provides mechanical advantage for torque transmission through the catheter length, improving manipulability despite the challenging access route.
Solution Approach 2:
The guide catheter acts as an intermediary device that facilitates the transfer of torque and positioning control from the operator's hands through the catheter system to the inner catheter and ultimately to the LIMA ostium. This intermediary structure mediates the mechanical challenges of the right radial approach by providing a stable platform for precise catheter positioning.
Data Source
AI summary
The present disclosure includes an integrated catheter system for cannulation of a LIMA graft from a right radial access point. Some integrated catheter systems include a guide catheter comprising an elongated member having an outer sheath body portion that includes an outer sheath proximal end, an outer sheath distal end, and an outer sheath lumen extending through the outer sheath between the outer sheath proximal end and the outer sheath distal end, the outer sheath including a curved section that includes: a first curved segment, a second curved segment, a third curved segment, a fourth curved segment, a first extended segment between the third curved segment and the fourth curved segment, and a second extended segment between the fourth curved segment and the outer sheath distal end.