Design and Experimental Validation of an Active Catheter for Endovascular Navigation

TL;DR

This paper presents the design, development, and experimental validation of an active, SMA-based catheter for endovascular navigation, aiming to improve clinical procedures with robotic assistance.

Contribution

It introduces a novel SMA-based active catheter design with a new manufacturing method and demonstrates its effectiveness in realistic anatomical models and animal testing.

Findings

Successful cannulation of arteries in pig model

Effective navigation in silicon arterial model

Prototype meets anatomical constraints

Abstract

Endovascular technique has many advantages but relies strongly on operator skills and experience. Robotically steerable catheters have been developed but few are clinically available. We describe here the development of an active and efficient catheter based on Shape Memory Alloys (SMA) actuators. We first establish the specifications of our device considering anatomical constraints. We then present a new method for building active SMA-based catheters. The proposed method relies on the use of a core body made of three parallel metallic beams and integrates wire-shaped SMA actuators. The complete device is encapsulated into a standard 6F catheter for safety purposes. A trial-error campaign comparing 70 different prototypes is then conducted to determine the best dimensions of the core structure and of the SMA actuators with respect to the imposed specifications. The final prototype is tested on a silicon-based arterial model and on a 23-kg pig. During these experiments we were able to cannulate the supra-aortic trunks and the renal arteries with different angulations and without any complication.