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Related Experiment Videos

A new cryosurgical device for controlled freezing

Y Rabin1, R Coleman, D Mordohovich

  • 1Department of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel.

Cryobiology
|February 1, 1996
PubMed
Summary
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A new computer-controlled cryosurgical device precisely manages cooling rates for effective cryotreatment. In vivo studies on rabbit skin and muscle show controlled freezing is a viable surgical tool, with lesions reaching up to 25 mm deep.

Area of Science:

  • Biomedical Engineering
  • Surgical Technology
  • Cryobiology

Background:

  • Cryosurgery is a therapeutic approach utilizing extreme cold to destroy unwanted tissue.
  • Precise control over the cooling rate at the freezing front is crucial for optimizing cryosurgical outcomes.
  • Existing cryosurgical devices may lack the necessary precision for controlled freezing.

Purpose of the Study:

  • To introduce and validate a novel computer-controlled cryosurgical device designed for precise cooling rate management.
  • To present initial in vivo experimental results of cryotreatments using the new device.
  • To analyze heat transfer and histological responses in cryotreated biological tissues.

Main Methods:

  • Development of a computer-controlled cryosurgical device with cryoprobe temperature as the controlling variable.

Related Experiment Videos

  • In vivo experimental cryotreatments on rabbit skin and skeletal muscle (13 cases).
  • In vivo temperature measurement using miniature thermocouples and X-ray imaging, coupled with numerical heat transfer simulations.
  • Histological examination of cryotreated tissue at immediate, 4-day, and 7-day post-procedure intervals.

    • Main Results:

    • The new cryosurgical device effectively controlled cooling rates at the freezing front.
    • Cryolesion penetration depth ranged from 5-15 mm, potentially extending to 25 mm.
    • Skin cells were destroyed and rapidly replaced by epithelial cells; skeletal muscle showed responses similar to crush damage.
    • Blood vessels in the cryotreated region largely remained intact without significant erythrocyte extravasation.

    Conclusions:

    • The developed computer-controlled cryosurgical device is an effective surgical tool for controlled low-cooling-rate freezing.
    • The study provides valuable insights into thermal behavior and tissue response during cryosurgery.
    • Further research can leverage this device to investigate factors influencing cryosurgical outcomes.