Nucleation enhanced surface modification to support physical vapor deposition to create a vacuum
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United States of America Patent
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May 14, 2013
Issued Date -
N/A
app pub date -
Sep 18, 2009
filing date -
Sep 19, 2008
priority date (Note) -
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Abstract
The device of the invention takes the form of a catheter/probe and is a closed loop system in which cryogen is delivered along the length of the catheter/probe to the tip where freezing occurs, and then recirculated. The device is a tube within a tube and comprises a number of parts including supply and return (internal) tubes, outer sheath (external tube) seaJed to the inner tubes at one or both ends with a gas filled lumen between the internal and external tubes. The lumen of the external tube is filled with a saturated gas which solidifies upon cooling, thereby creating a vacuum along the catheter length and providing for insulation between the inner and outer tubes, and preventing freezing along the probe shaft length. The outside surface of the internal tubes is modified to potentiate gas nucleation on the outer surfaces of the internal tubes when cooled.
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