Dissertation > Excellent graduate degree dissertation topics show

Investigation and Basic Experiments for Liquid CO2 Cryoprobe

Author: XuGuangCai
Tutor: TongMingWei
School: Chongqing University
Course: Refrigeration and Cryogenic Engineering
Keywords: Biological tissue cryoprobe liquid carbon dioxide cryosurgery vacuum
CLC: TH775
Type: Master's thesis
Year: 2006
Downloads: 33
Quote: 0
Read: Download Dissertation

Abstract


The investigation on the theory of heat and mass transmission has been the hot research.The study of the heat and mass conductivity in the process, that biological tissue is frozen and thawed, has the signify theory meaning and practicality value.Aiming at the theory of heat and mass transmission, this thesis has done some analysis in theory and primary experiments. Firstly, we have done the analysis of The effects of the vacuum acting on blood flow perfusion. It indicates that blood flow perfusion has great infection on heat transfer in the biological tissue. According to the experiments, the time that the vacuum acts on biological tissue has little action for the engorgement and gore. The degree of the vacuum plays an important role on the engorgement and gore. The vacuum acting on the biological tissue can not only reduce the blood flow perfusion, but also lessen the pervasion of cancer cell. The probability that operation succeeds increases. So we design the liquid carbon dioxide cryoprobe with the vacuum structure.On the base, the author designs three structures: in vacuum, heat conduction and spout and makes the experiment device of the cryoprobe system. After repeating experiment, dry ice jam is overcome via adding a mid-heater. Therefore liquid CO2 avoids gas-solid multiphase flow, and supplies continuous low temperature gas for cryoprobe.Experimental results show that the 2-dimension temperature distribution for the first time, it includes:(1) The cooling velocity and freezing zone increases along the flux up at certain size of the cryoprobe in the same biological tissue.(2) As the diameter of cryoprobe increases, the temperature will descend faster, freezing zone will be broader obviously, and ice ball become larger. Until it arrives heat balance, the temperature keeps invariability.(3) Single freezing-thaw results in biggish mechanical injury already for loosen tissue such as pork liver; Successive freeze-thaw circle could quicken freezing and thaw velocity for compact tissue, and it has proved the more mechanical injury of successive freeze-thaw circle than the single freezing-thaw treatment.(4) Spout cryoprobe use less liquid CO2 than conductive cryoprobe.The paper shows that this cryoprobe has better cure effective. Synchronous gets the growth velocity and diameter character of ice ball in different biological tissue along the

Related Dissertations

  1. Study on Hermetic EDGE Sealing of Anodic Bonding for Vacuum Glazing,TQ171.1
  2. Preparation of Essence and Residues Powder from Flammulina Velutipes and Evaluation of Their Physical-Chemical Properties,S646.15
  3. The Study of Microstructure and Performance of La2 O3+CeO2-Ni-WC Composite Coating by Vacuum Fusion Sintering,TG174.44
  4. Measurement of Geotechnical Properties for Sewage Sludge at a Disposal Site and Evaluation of Its Influence on Slope Stability of MSW Landfill,X705
  5. Alumina vacuum carbothermal reduction experimental study,TF821
  6. Research on the Interface Structure and the Infiltration-mechanism of SiC_p/AZ91D by Vacuum,TB331
  7. Study on the Preparation and Photoconductivity of β-TiOPc,O626
  8. Vacuum interrupter of the X-ray hazards and applied research,TM564.2
  9. Profile Design and Numerical Analysis on Air-cooled Roots Vacuum Pump,TB752
  10. Study on Strengthened Residual Oil Coking Process,TQ520.6
  11. Study and Fabrication of Three-Dimensional Laparoscopic Face Broadband AR Coating,O484.41
  12. Design and Manufacture of the Infrared Double Wave Band Laser Filter Film,O484.41
  13. Research on Vacuum-preloading Consolidation Mechanism and Project Application,U656.2
  14. Research on Synchronous Control System of VS1-12/M Vacuum Circuit Breaker with Permanent Magnetic Actuator Based on DSP,TM561.2
  15. The Numerical Simulation of the Temperature Field on Vacuum Arc Remelting of Titanium Alloys,TF823
  16. Keep TiSi2 Process Performance in IC Manufacture,TN405
  17. Handling and Utilization of Vacuum Residue from Slurry-bed Hydrocracking of Venezuela Heavy Oil,TE624.4
  18. Study Onautolysis Mechanisms and Vacuum Cold Technology of Agrocybe Aegerita,S646
  19. The Study of H Doping in ZAO:H Transparent Conductive Thin Films,TB43
  20. Design and Field Test of Vacuum and Load-bearing,TU472.33
  21. Microstructure and Properties of Aluminum and Aluminum Based Alloy Films Prepared by Evaporation and Magnetron Sputtering,TB383.2

CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Medical and health devices > Freezer equipment for medical
© 2012 www.DissertationTopic.Net  Mobile