Key result
A new prototype active micro catheter with two bending degrees of freedom using SMA wires was successfully modeled and demonstrated applicability for intracavity operations in simulation experiments.
A novel active micro catheter with shape memory alloy actuators demonstrates feasible bending motion for potential intracavity operations.
Prototype feasibility in simulations warrants caution before clinical use; leaves open in vivo validation for intracardiac applications.
In this paper, we propose a new prototype model of serial-parallel type of active micro catheter (MAC) with two bending degrees of freedom. It is 4 Fr, 5 Fr and 6 Fr (1 Fr=1/3 mm) in diameter and consist of 3 active units incorporating SMA wires in lumina as the servo actuator. The bending motion, bending direction and bending angle of the MAC have been measured by application of electricity in air and in physiological saline solution. We also modeled this MAC. Experimental results show that the model of the MAC is reasonable for practical applications. By using simulators (conditions similar to a body cavity), we carried out the simulation experiments of "in vitro" and "in vivo". The experimental results indicate that the proposed MAC is applicable to intracavity operations.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Fukuda et al. (2002) studied Intracavity operations. Active micro catheter (MAC) was evaluated on Bending motion, bending direction, and bending angle in air and physiological saline solution. A new prototype active micro catheter with two bending degrees of freedom using SMA wires was successfully modeled and demonstrated applicability for intracavity operations in simulation experiments.
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