Rotating Catheter Tip With OCT Imaging for Occlusion Crossing
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Solution Overview
Problem
Existing occlusion-crossing devices face challenges in effectively navigating guidewires through occlusions in peripheral arteries without damaging the vessel walls, due to poor cutting surfaces that often drill off-center or mash the occlusion rather than cutting through it cleanly.
Innovation Solution
The development of catheters with a rotating distal tip featuring an OCT imaging sensor and tissue-dissecting elements, including corkscrew-like tips that rotate at low speeds to prevent static friction and avoid damage to vessel walls, equipped with cutting edges and a central lumen for guidewire passage, allowing precise navigation and imaging during the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing occlusion-crossing devices are used to pass guidewires through occlusions, then the guidewire can be positioned, but the cutting surfaces drill off-center or mash the occlusion causing damage to vessel walls
Solution Approach 1:
The catheter incorporates a rotating distal tip that dynamically adjusts the cutting action. The rotation mechanism allows the cutting edges to engage the occlusion in a controlled manner, preventing off-center drilling and reducing tissue damage while maintaining effective occlusion crossing capability
Solution Approach 2:
The rotating tip creates a controlled mechanical action against the occlusion that prevents static friction and enables clean cutting. The rotational motion transforms the cutting mechanism from a static drilling action to a dynamic slicing action that reduces tissue damage
2Reliability
If a guidewire is placed through the occlusion, then effective treatment can be achieved, but it is difficult to prevent the guidewire from directing out of the lumen into the adventitia and surrounding tissues
Solution Approach 1:
The catheter acts as an intermediary device that guides the guidewire through the occlusion in a controlled manner. The catheter shaft and distal tip structure provide a protective pathway that prevents the guidewire from deviating into the adventitia and surrounding tissues, ensuring safe and effective treatment
3Object-affected harmful factors
If the distal tip rotates at low speeds, then static friction is prevented and vessel walls are protected, but the cutting action may be reduced
Solution Approach 1:
The system optimizes the rotation speed parameter to balance cutting efficiency with tissue protection. By controlling the rotational velocity within a specific range, the device maintains effective cutting action while preventing excessive speed that could cause tissue damage or static friction
Data Source
AI summary
A catheter device for crossing occlusions includes an elongate catheter shaft, a rotatable tip configured to rotate relative to the elongate catheter shaft, a drive shaft, and an OCT imaging sensor. The rotatable tip includes a central guidewire lumen, a distal grinding surface, and a fluted portion. The distal grinding surface can be substantially perpendicular to the guidewire lumen and include divots and sharp points that form pyramidal features, where the sharp points extend distally from the distal grinding surface. The fluted portion can have flutes extending around a circumference of the rotatable tip proximal to the distal grinding surface. The fluted portion may not include the divots and sharp points that form the pyramidal features of the distal grinding surface.