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Design and Manufacturing of Water Jet Apparatus for Cutting Soft Tissue and Interaction Analysis

Vatani, Pouyan | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52922 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Assempour, Ahmad
  7. Abstract:
  8. Cancer is one of the deadliest diseases of the modern era and accounts for 13% of all deaths in humans. Most cancers and lesions in the human body are related to soft tissue. Many soft-tissue cancers and lesions occur in sensitive areas of the body, such as the brain, pituitary, and intestine. The pituitary gland is located in the human head and near the optic nerves. Surgery in a typical way can result in risks such as heat loss of the optic nerve or injuries to healthy tissues due to the sharpness of the surgery tool. One of the alternatives to conventional surgery is water jet surgery. This method minimizes the risks of human error. In the present study, a water jet machine was designed and fabricated for soft tissue cutting. Experiments were then performed on soft tissue surrogates. In these experiments, the effect of various variables such as time, nozzle diameter, nozzle backpressure, and jet velocity on the depth of cut was investigated. These results are useful for predicting the incision process, surgical device design, and surgical strategy. For each surrogate, the pressure threshold required for starting incision is achieved; this information prevents accidental damage to other soft tissues. In the next step, numerical simulation with damage parameter for soft tissue with more realistic properties than previous studies is performed. Numerical simulation results show that simulation using strain damage variable 0.3 gives closer results to experimental experiments. Experimental and numerical results confirm that the use of water jets in shorter periods improves incision efficiency
  9. Keywords:
  10. Soft Tissues ; Fabrication ; Finite Element Simulation ; Experimental Test ; Waterjet Cutting ; Waterjet Surgery

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