A Novel Quasilinear Viscoelastic Model of the Bending of a Steerable Catheter

IF 0.8 4区医学 Q4 ENGINEERING, BIOMEDICAL

Journal of Medical Devices-Transactions of the Asme Pub Date : 2023-08-23 DOI:10.1115/1.4063215

Jajun Ryu, Jung-Hwa Ahn, Hwa-Young Kim

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Abstract

The present study proposes a novel model that establishes the relationship between the bending moment and the curvature of a steerable catheter. The catheters exhibit a nonlinear viscoelastic tendency, so the moment-curvature relationship is modeled as a bending of a quasilinear viscoelastic (QLV) cantilever beam. Stress relaxation tests with multiple magnitudes are performed on a catheter, and the parameter tuning is carried out with the test results to find out the coefficients of the model. The form of the instantaneous moment response, which is an important term within the QLV equation, is selected as a logarithmic form by analyzing the test results. This differentiates the accuracy of the model from using the commonly used exponential form. The performance of the logarithmic QLV model is compared to the conventional models by checking the curvature range each model can cover with a certain accuracy. The covering range for elastic, linear viscoelastic, and exponential QLV models are 22.1%, 64.4%, and 55.5%, respectively, whereas the covering range of the logarithmic QLV model is 100%.

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一种新型的可操纵导管弯曲拟线性粘弹性模型

本研究提出了一种新的模型，建立了可操纵导管弯矩与曲率之间的关系。导管表现出非线性粘弹性倾向，因此弯矩-曲率关系被建模为准线性粘弹性悬臂梁的弯曲。对导管进行了多量级的应力松弛试验，并根据试验结果进行了参数整定，得到了模型的系数。通过对试验结果的分析，选择QLV方程中重要的一项瞬时矩响应形式为对数形式。这区别于使用常用的指数形式的模型的准确性。通过检查每个模型在一定精度下所能覆盖的曲率范围，将对数QLV模型的性能与传统模型进行比较。弹性、线性粘弹性和指数QLV模型的覆盖范围分别为22.1%、64.4%和55.5%，而对数QLV模型的覆盖范围为100%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Medical Devices-Transactions of the Asme ENGINEERING, BIOMEDICAL-

CiteScore

1.80

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Medical Devices presents papers on medical devices that improve diagnostic, interventional and therapeutic treatments focusing on applied research and the development of new medical devices or instrumentation. It provides special coverage of novel devices that allow new surgical strategies, new methods of drug delivery, or possible reductions in the complexity, cost, or adverse results of health care. The Design Innovation category features papers focusing on novel devices, including papers with limited clinical or engineering results. The Medical Device News section provides coverage of advances, trends, and events.