Non-rigid cutting of soft tissue: physical evidences of complex mechanical interaction process of soft materials
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Non-rigid cutting of soft tissue: physical evidences of complex mechanical interaction process of soft materials Chao Cao1,2 , Guilin Li3 , Jiyun Zhao1,a 1 School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China 2 Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment, China University of Mining and
Technology, Xuzhou 221116, China
3 Xuzhou Maternal and Child Health Care Hospital, Xuzhou Medical University, Xuzhou 221000, China
Received: 17 June 2020 / Accepted: 12 October 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The application of medical waterjet achieves non-rigid separation of soft tissues. The separation effect is the result of the interaction between hydrodynamic and biomechanical nonlinear responses. In this study, a non-rigid cutting model of soft tissue was established based on fracture mechanics and energy conversion processes. It can clearly explain the physical reasons for the advantages of non-rigid separation: The extremely high impact speed, which is difficult to achieve through rigid separation, makes the stress and deformation of the soft tissue smaller. The non-rigid cutting model reveals the impact mechanism of waterjet impact velocity or pressure on the static separation effect. Based on the experimental observation of the physical morphology during the interaction process and the measurement of the dynamic separation rate, imaging evidences for dynamically evaluating the separation effect were proposed. The method of adjusting the separation effect including the splashing behavior of the waterjet was verified. The research results precisely link the application requirements of precision surgery with the physical form of the interactive process, establish a physical basis for expanding the advantages of non-rigid separation of soft tissue and provide guidance for the evaluation of dynamic separation effects.
1 Introduction The high speed impact of medical waterjet can separate the soft tissue while protecting the blood vessel and neural network to form the selective separation effect. Because of this selective separation effect, medical separation technology is being applied to various surgical operations. Jaeger et al. [1] studied whether the needle-free waterjet device could accurately pass through the connective tissue near the urinary tract epithelium and sphincter under specified conditions, without allowing the sphincter apparatus to penetrate completely. Belle et al. [2] conducted a study on endoscopic mucosal adenoma resection. Kraaij et al. [3] discussed the feasibility of waterjet cutting interface tissue membrane. Ogawa et al. [4] achieved the retention of optic nerve during the resection of skull base tumor by waterjet. Misrai et al. [5] conducted a real-time image-guided endourological semiautonomous tissue ablation for
a e-mail: [email protected] (corresponding author)
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Eur. Phys. J. Plus
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