Method of controlling air flow from an inflated blanket
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United States of America Patent
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Apr 19, 1994
Issued Date -
N/A
app pub date -
Jun 21, 1993
filing date -
Jul 20, 1992
priority date (Note) -
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Abstract
The invention pertains to the method and apparatus for forming air flow control orifices in a patient body temperature regulating blanket consisting of an inflated envelope defined by thin plastic film wherein temperature controlled air flows through the blanket orifices upon the patient's body. The blanket side disposed toward the patient is pierced by a sharp pointed punch having a plurality of intersecting facets defining sharpened intersecting edges. The punch apex and facet intersecting edges are related to the moving film in such a manner that the penetration of the punch forms a plurality of flexible valve flaps, and the valve flaps engaging the patient's body will be retained in a closed condition to restrain air flow through those orifices engaging the body to prevent exposure to excessive air temperatures.
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