Kraaij Gert, Tuijthof Gabrielle J M, Dankelman Jenny, Nelissen Rob G H H, Valstar Edward R
Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, P.O. Box 9600, Leiden 2300RC, The Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, Delft 2628CD, The Netherlands.
Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, Delft 2628CD, The Netherlands; Department of Orthopedic Surgery, Academic Medical Center, Meibergdreef 9, Amsterdam 1105 AZ, The Netherlands.
Med Eng Phys. 2015 Feb;37(2):245-50. doi: 10.1016/j.medengphy.2014.12.009. Epub 2015 Jan 22.
Waterjet cutting technology is considered a promising technology to be used for minimally invasive removal of interface tissue surrounding aseptically loose hip prostheses. The goal of this study was to investigate the feasibility of waterjet cutting of interface tissue membrane. Waterjets with 0.2 mm and 0.6 mm diameter, a stand-off distance of 5 mm, and a traverse speed of 0.5 mm/s were used to cut interface tissue samples in half. The water flow through the nozzle was controlled by means of a valve. By changing the flow, the resulting waterjet pressure was regulated. Tissue sample thickness and the required waterjet pressures were measured. Mean thickness of the samples tested within the 0.2 mm nozzle group was 2.3 mm (SD 0.7 mm) and within the 0.6 mm nozzle group 2.6 mm (SD 0.9 mm). The required waterjet pressure to cut samples was between 10 and 12 MPa for the 0.2 mm nozzle and between 5 and 10 MPa for the 0.6 mm nozzle. Cutting bone or bone cement requires about 3 times higher waterjet pressure (30-50 MPa, depending on used nozzle diameter) and therefore we consider waterjet cutting as a safe technique to be used for minimally invasive interface tissue removal.
水刀切割技术被认为是一种很有前景的技术，可用于微创去除无菌性松动髋关节假体周围的界面组织。本研究的目的是探讨水刀切割界面组织膜的可行性。使用直径为0.2毫米和0.6毫米、离焦距离为5毫米、横向速度为0.5毫米/秒的水刀将界面组织样本切成两半。通过阀门控制通过喷嘴的水流。通过改变水流来调节产生的水刀压力。测量组织样本厚度和所需的水刀压力。在0.2毫米喷嘴组中测试的样本平均厚度为2.3毫米（标准差0.7毫米），在0.6毫米喷嘴组中为2.6毫米（标准差0.9毫米）。切割样本所需的水刀压力，0.2毫米喷嘴为10至12兆帕，0.6毫米喷嘴为5至10兆帕。切割骨头或骨水泥需要大约高三倍的水刀压力（30至50兆帕，取决于使用的喷嘴直径），因此我们认为水刀切割是一种用于微创去除界面组织的安全技术。
