Surgery – Blood drawn and replaced or treated and returned to body
Reexamination Certificate
2005-05-31
2005-05-31
Bennett, Henry (Department: 3713)
Surgery
Blood drawn and replaced or treated and returned to body
C604S006010, C604S067000, C210S741000, C210S090000
Reexamination Certificate
active
06899691
ABSTRACT:
A method and apparatus for controlling a fluid separation system in response to fluid pressure changes in a fluid flow, said method comprising the steps of sensing a fluid pressure; comparing the fluid pressure to a threshold value, and if the fluid pressure is below the threshold value, then pausing fluid flow for a selected period. During the selected period, either the fluid pressure sensed automatically resolves or the method further comprises a step of setting a fall alarm condition. The method and apparatus may further include interpreting a particular quantity of below threshold fluid pressure occurrences where the fluid pressure is below the threshold value occurring within a particular time period, and then, signalling an alarm. Threshold values may be calculated by the method or apparatus according to a formula such as the following:in-line-formulae description="In-line Formulae" end="lead"?Threshold Value=Config+75−0.3309*Qin/(1−Hin)−0.3026*Qn/(1−Hn);in-line-formulae description="In-line Formulae" end="tail"?where,Config=a configuration pre-selected pressure value;Qin=fluid flow rate in the inlet tubing line;Hin=Hematocrit in the inlet tubing line;Qn=fluid flow rate in the needle; andHn=Hematocrit in the needle.
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Bainbridge Marlene A.
Felt Thomas J.
Bennett Henry
Butterfield Laura M.
Gambro Inc.
Nguyen Camtu
O'Connor Edna M.
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