Sealing Liver tissue using Non thermal plasma Enameled copper wire as dbd electrode

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Sealing Liver tissue using Non thermal
plasmaEnameled copper wire as dbd electrode

• Sameer Kalghatgi

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Motivation

• To seal cuts in chicken liver tissue using non
  thermal plasma
• Enameled copper wire is used as a DBD electrode

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Enameled Copper Wire

• Standard copper wire of 28AWG coated with
  polyesterimide enamel
• Typical coating thickness of enamel is 0.001
• Electrical Breakdown voltage of the wire is
  6000V/mil

Plasma generated using enameled copper wire
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Sealing Liver Tissue Set up

• Enameled copper wire is connected to high voltage
  power supply (continuous mode)
• Current passed through the electrode in 5 sec
  bursts.
• Part of the current diverted to another electrode
  connected in parallel (to reduce current through
  wire)
• Straight wire and loop of wire used to treat the
  cut in liver surface.

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Setup Schematic
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Results
Before
After
Cut in liver surface before treatment
Cut treated with plasma using wire electrode
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Results

• Plasma chars the tissue causing considerable
  damage (identifiable by smoke and burning smell)
• No sealing achieved after treatment for 5 s, 10
  s, 15 s and 30 s.
• Treatment for more than 30 s causes considerable
  thermal damage.
• Enamel coating melts in a very short time
  (15-20secs) exposing the copper wire

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Analysis

• High current density in the wire electrode
• Concentration of plasma at local spots on the
  wire due to non-uniformity of the wire
• Enamel cannot withstand the current and high
  temperature
• After enamel deteriorates the wire electrode
  essentially acts a RF plasma electrode