Journal ArticleDOI
Research on the axis shape of an active catheter
TLDR
An active catheter is a minimally invasive surgery catheter that can perform deflectable motions and moves like a snake, utilizing a multi‐joint mechanism with distributed shape memory alloy (SMA) actuators.Abstract:
Background
An active catheter is a minimally invasive surgery catheter that can perform deflectable motions. The active catheter can be controlled from outside the body and moves like a snake, utilizing a multi-joint mechanism with distributed shape memory alloy (SMA) actuators.
Methods
It was considered that the deflection curve of the axis of the catheter is determined by the output force of the SMA actuators. Based on the large deflection theory, the deflection curve equation of the axis of the catheter was derived, using the precise form of the curvature.
Results
Through experimentation, the axial bending curve shape of the blended active catheter was measured precisely, and the experimental results were compared with the calculation results obtained from the large deflection theory and the circular arc hypothesis. The experimental results show that the curves calculated by large deflection theory are very close to the actual axis curves.
Conclusions
An active catheter prototype has been designed using the theory presented in this paper. Utilizing a vascular model, the active catheter-based invasive surgery was simulated. The experiment confirmed that the large deflection theory calculation method can be used to guide the design of the active catheter. Copyright © 2008 John Wiley & Sons, Ltd.read more
Citations
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Batch fabrication flat meandering shape memory ally actuator for active catheter
TL;DR: In this article, a new batch fabrication process of a shape memory alloy (SMA) sheet based on electrochemical pulse etching with a sacrificial dummy metal layer has been developed, which has realized a throughout micromachining of the SMA sheet.
Journal ArticleDOI
Pressure Pulse Drive: A Control Method for the Precise Bending of Hydraulic Active Catheters
TL;DR: In this article, a pressure pulse drive is proposed to bend the active segment of a catheter. But the method is not suitable for the use in the case of human blood vessels.
Journal ArticleDOI
Active Catheters for Neuroradiology
TL;DR: A new analytical model for predicting the 20 thermo-mechanical behavior of steerable catheters actuated through SMA wires is proposed and an expression for the maximal achievable bending angle of the catheter tip is given.
Patent
Articulation Systems, Devices, and Methods for Catheters and Other Uses
TL;DR: Articulation devices, systems, methods for articulation, and methods for fabricating articulation structures will often include simple balloon arrays, with inflation of the balloons interacting with elongate skeletal support structures so as to locally alter articulation of the skeleton.
Patent
Fluid-actuated sheath displacement and articulation behavior improving systems, devices, and methods for catheters, continuum manipulators, and other uses
Phillip Laby,Mark D. Barrish +1 more
TL;DR: In this paper, balloon arrays are used to improve the articulation behavior of the skeleton of a flexible body such as a catheter, which can be used for minimally invasive medical catheter systems.
References
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Proceedings ArticleDOI
Micro active catheter system with multi degrees of freedom
TL;DR: Experimental results indicate that the proposed MAC is applicable to intracavity operations and the model of the MAC is reasonable for practical applications.
Journal ArticleDOI
Batch fabricated flat meandering shape memory alloy actuator for active catheter
Takashi Mineta,Toshiaki Mitsui,Yoshiyuki Watanabe,Seiya Kobayashi,Yoichi Haga,Masayoshi Esashi +5 more
TL;DR: In this paper, a new batch fabrication process of a shape memory alloy (SMA) sheet based on electrochemical pulse etching with a sacrificial dummy metal layer has been developed, which has realized a throughout micromachining of the SMA sheet.
Journal ArticleDOI
Future of Active Catheters
TL;DR: In this article, a prototype of a catheter that can move like a snake, incorporating distributed shape memory alloy (SMA) actuators, a related device (built-in circuit and techniques (laser CVD), and possible solutions are suggested.
Batch fabrication flat meandering shape memory ally actuator for active catheter
TL;DR: In this article, a new batch fabrication process of a shape memory alloy (SMA) sheet based on electrochemical pulse etching with a sacrificial dummy metal layer has been developed, which has realized a throughout micromachining of the SMA sheet.
Proceedings ArticleDOI
Small diameter active catheter using shape memory alloy
TL;DR: Three kinds of active catheters whose outside diameters are less than 2 mm were fabricated and the endoskeletal type active catheter was applied to intraureteral ultrasonography used in a kidney.