Automatic high negative pressure relief valve and chest drainage units using same
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United States of America Patent
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-
Apr 28, 2009
Grant Date -
Oct 28, 2004
app pub date -
May 25, 2004
filing date -
Aug 7, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Featured is an automatic high-negative pressure relief valve and its use in combination with an apparatus for draining fluid from a body. In broad terms the negative pressure relief valve includes a biasing mechanism, a moveable member acted upon by the biasing mechanism and a seating surface. When the pressure within a chamber, in which a portion of the relief valve is in fluid communication with, is less than a predetermined negative pressure, the moveable member is moved by the biasing mechanism to sealing engage the seating surface and when the pressure is at or above the predetermined value, the restoring force of the biasing mechanism is overcome and the moveable member moves away from the seating surface. In an exemplary embodiment, the biasing mechanism is a spring, diaphragm or wave washer.
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Family
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Cited Art Landscape
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