手术缝合线—软组织界面摩擦行为研究

发布时间：2018-05-29 02:57

本文选题：手术缝合线 + 生物软组织　；参考：《西南交通大学》2017年硕士论文

【摘要】：随着医疗科技的不断进步,微创外科手术不断地向自动化、智能化方向发展。微创手术缝合操作是一项繁琐、耗时和复杂的工作,缝合的效率直接影响着整个手术的成败。手术缝合操作可分为缝合、打结两个动作。在缝合过程中,手术缝合线与生物软组织界面的摩擦特性严重影响着手术缝合效率,而在打结过程中,结的可靠性主要受到缝合线与缝合线界面摩擦性能的影响。本文模拟手术缝合打结操作,研究了不同手术操作参数和缝合线设计参数对其摩擦性能的影响。开展的主要工作和相关结论如下:模拟手术打结操作,利用生物力学试验机(型号:HY0580)研究了载荷、缝合线表面结构和速度对缝合线-缝合线界面的摩擦特性的影响。实验结果表明:缝合线的摩擦性能受到载荷和缝合线表面结构影响,而与缝合线移动速度无关。随着载荷的增大,线-线界面摩擦力增大。单丝结构和表面涂层可以有效的降低缝合线的表面粗糙度,从而减小缝合线的摩擦力。模拟手术缝合操作,以CETR多功能摩擦磨损试验机为实验装置主体,建立了缝合线法向加载的单方向缝合线-软组织表面滑动模型。以人造皮肤、猪肌肉、猪肝脏三种组织为实验样品,复丝缝合线(丝线)、单丝缝合线(聚丙烯缝合线)和有涂层复丝缝合线(聚乳糖酸910缝合线)三种不同表面结构的缝合线为实验对象,将法向载荷分别置为0.1 N到0.5 N,滑移速度分别置为5 mm/s到25 mm/s进行了手术缝合线-生物软组织界面摩擦实验。实验结果表明:1.缝合线-生物软组织界面的摩擦系数随着法向载荷的增大而减小,随着滑移速度的增大而增大。这主要与软组织的非线性粘弹性性能和变形滞后性能有关。2.缝合线的表面涂层和单丝涂层可以降低表面粗糙度和表面吸附性能,从而有效的降低缝合线-软组织界面的摩擦系数。3.相比于人造皮肤,猪肝脏和猪肌肉中存在这大量的生物液体(组织液、血液)可对缝合线-软组织界面起到润滑作用,从而降低界面的粘附摩擦系数。
[Abstract]:With the development of medical science and technology, minimally invasive surgery is developing towards automation and intelligence. Minimally invasive suture is a complicated, time-consuming and complicated operation, and the efficiency of suture directly affects the success or failure of the operation. Suture operation can be divided into two movements: suture and knot. In the process of suture, the friction characteristics of the interface between the suture and the biological soft tissue seriously affect the efficiency of the suture, while the reliability of the knot is mainly affected by the friction between the suture and the suture. In this paper, the effects of different operation parameters and suture design parameters on the friction performance of the suture knots are studied. The main work and related conclusions are as follows: the effects of load, surface structure and velocity of suture on the friction characteristics of suture-suture interface are studied by using biomechanical testing machine (type: HY0580). The experimental results show that the friction performance of the suture is affected by the load and the surface structure of the suture, but not by the speed of the suture movement. With the increase of load, the friction at the line-line interface increases. Monofilament structure and surface coating can effectively reduce the surface roughness of stitches and thus reduce the friction of stitches. In order to simulate the operation of suture, a single direction suture line surface sliding model with normal loading of suture line was established with CETR multifunctional friction and wear tester as the main body of the experiment device. Three kinds of tissues, artificial skin, pig muscle and pig liver, were used as experimental samples. Three kinds of suture lines with different surface structures (silk thread, monofilament suture (polypropylene suture) and coated multifilament suture (polylactate 910 suture) were used as experimental objects. The normal load is 0. 1 N to 0. 5 N, and the slip velocity is 5 mm/s to 25 mm/s. The friction experiment between suture line and biological soft tissue interface is carried out. The result of the experiment shows that 1: 1. The friction coefficient between suture and biological soft tissue decreases with the increase of normal load and increases with the increase of slip velocity. This is mainly related to the nonlinear viscoelastic properties and deformation hysteresis properties of soft tissue. The surface roughness and adsorption property of the suture line can be reduced by the surface coating and the monofilament coating, which can effectively reduce the friction coefficient of the suture and soft tissue interface. Compared with artificial skin, the presence of this large amount of biological fluid (tissue fluid, blood) in porcine liver and muscle can lubricate the suture and soft tissue interface, thus reducing the friction coefficient of the interface.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R61;R318.01

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