Matching Design Method for Exit Parameters of Medical Waterjet Generating Device

doi:10.3901/JME.2022.12.293

Abstract

Abstract: An outlet parameter matching design method for a medical waterjet generator for soft tissue separation is proposed. The optimized path of the waterjet parameters is perfected from the aspects of waterjet force matching separation object fracture performance and clinical operating space. Facing the elastic deformation characteristics of soft tissue, the influence mechanism of waterjet diameter and impact velocity on the time and scope of water hammer during impact process was studied. Based on the dynamic distribution characteristics of micro-scale waterjet, a diameter-dependent initial length model of the waterjet, that is, a model for calculating the concentration length of waterjet forces in clinical operations, was established. The results show that for objects with different mechanical properties, the combination of impact speed or pressure and outlet diameter can optimize the clinical effect on the premise of ensuring the waterjet initial length. Through optical observation methods, the micro-scale waterjet generation system experiments have verified that the area of waterjet force concentration within the exit diameter of 0.2 mm can meet the operation needs. The results lay a theoretical foundation for the hierarchical design and optimization of medical waterjet generators.

Key words: medical waterjet, water hammer, soft tissue destruction, micro-scale, match design

CLC Number:

TK79

CAO Chao, ZHAO Jiyun, LI Guilin, DING Haigang, KANG Jianhong, HAN Jing. Matching Design Method for Exit Parameters of Medical Waterjet Generating Device[J]. Journal of Mechanical Engineering, 2022, 58(12): 293-300.

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