Research on the axis shape of an active catheter

Fu, Yili; Li, Xianling; Wang, Shuguo; Liu, Hao; Liang, Zhaoguang

doi:10.1002/rcs.172

Cited by 13 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Performances of small dimeter active catheters using SMA actuatorsCoil-shaped SMA micro-actuators were also used in active catheterism for their high strain capabilities[25][26][27][28]. However, coil-shaped SMA actuators are usually limited in the tensile force they can deliver.…”

mentioning

confidence: 99%

Design and Experimental Validation of an Active Catheter for Endovascular Navigation

Couture

Szewczyk

2017

Journal of Medical Devices

View full text Add to dashboard Cite

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. * Corresponding authorA second major contribution of this paper is the derivation of a reliable mathematical model for predicting the bending angle of our active catheters. We first use this model to state some general qualitative rules useful for an iterative dimensional optimization. We then perform a quantitative comparison between the actual and the predicted bending angles for a set of 13 different prototypes. It happens that the relative error is less than 20% for bending angles between 100° and 150° which is the interval of interest for our applications.challenging and may result in an unsuccessful procedure. In most cases, several material exchanges are needed in one procedure, increasing the operative time. Several endovascular robotic systems have been developed to improve catheter navigation and reduce both the operating time and material.

show abstract

mentioning

confidence: 99%

Design and Experimental Validation of an Active Catheter for Endovascular Navigation

Couture

Szewczyk

2017

Journal of Medical Devices

View full text Add to dashboard Cite

show abstract

“…In Ref. [10], a more precise model, independent from this assumption, is presented. However, in this model, SMA actuators do not bend with the catheter structure but remain linearly stretched between their fixing points.…”

Section: Mechanical Behavior Of Sma-based Active Cathetersmentioning

confidence: 99%

Active Catheters for Neuroradiology

Szewczyk¹,

Marchandise²,

Flaud³

et al. 2011

J. Robot. Mechatron.

View full text Add to dashboard Cite

Surgeons performing endovascular interventions have high expectations with regard to the improvement of their operating tools and, more specifically, of their catheters. Active catheters, in which the tip moves actively using Shape Memory Alloy (SMA) actuators, constitute a promising approach. In this article, we review existing SMA-based active catheters present in the literature. We analyze their performances regarding the requirements imparted to neuroradiology. Then, we propose a new analytical model for predicting the thermo-mechanical behavior of steerable catheters actuated through SMA wires. Particularly, we give an expression for the maximal achievable bending angle of the catheter tip. These results are finally applied to the design of single-use small-diameter active catheters especially devoted to neuroradiology. In particular, we present a 3.3-Fr catheter suited for navigating into the Willis’ polygon and for accurate positioning into aneurysmal cavities.

show abstract

“…When the cable is pulled and shortened with respect to the shaft, the shaft compresses and bends in response. Depending on whether the pull cable runs on the inside or outside of the catheter, the bend can be modelled as a circular or an elliptic arc (Fu et al, 2008). However, what has not been established is the precise mathematical relationship between the tension in the pull cable and the bend curvature, which is likely to be determined by the deformation (strain) of the materials constituting the catheter shaft in response to mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Compression–bending of multi-component semi-rigid columns in response to axial loads and conjugate reciprocal extension–prediction of mechanical behaviours and implications for structural design

Lau

2013

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

Research on the axis shape of an active catheter

Cited by 13 publications

References 10 publications

Design and Experimental Validation of an Active Catheter for Endovascular Navigation

Design and Experimental Validation of an Active Catheter for Endovascular Navigation

Active Catheters for Neuroradiology

Compression–bending of multi-component semi-rigid columns in response to axial loads and conjugate reciprocal extension–prediction of mechanical behaviours and implications for structural design

Contact Info

Product

Resources

About