US Patent:
20070058412, Mar 15, 2007
Inventors:
David Wang - Sunnyvale CA, US
Peter Scaramuzzi - Morgan Hill CA, US
Mansour Saleki - San Jose CA, US
Robert Cousineau - Boston MA, US
Kent Abrahamson - Morgan Hill CA, US
Michael Lawless - Locust Grove OK, US
Marwan Fathallah - Mundelein IL, US
Brian Kidd - Seattle WA, US
Robert Boyd - Jacksonville FL, US
Howard Greene - Worthington OH, US
Eric Navin - Columbus OH, US
Lori Lucke - Eagan MN, US
Benjamin Mullin - Lino Lakes MN, US
International Classification:
G11C 13/00
Abstract:
A medical pump with an improved continuity low flow delivery system and method for use with a pumping chamber, for example in a cassette, is disclosed. The pump includes a pump drive for exerting a force on the pumping chamber and a sensor for sensing the force/pressure exerted by the pump drive on the pumping chamber. The pump drive position sensor senses the position of the pump drive. The medical pump also includes a processing unit and a memory having a programming code adapted to calculate the rate of change of the sensed force/pressure values and determine whether the rate of change of the sensed force/pressure values meets a rate of change threshold. Once the rate of change threshold is met, the programming code is adapted to calculate a remaining pump drive travel value for determining how much farther the pump drive should travel before the end of an effective pump cycle. The programming code is further adapted to trigger one or more signals to drive the pump drive for the remainder of the effective pump cycle using the remaining pump drive travel value.