The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 1997
Filed:
Feb. 15, 1995
Robert L Anderson, Boulder, CO (US);
Daniel C Colesworthy, III, Boulder, CO (US);
Warren P Heim, Boulder, CO (US);
Larry Blankenship, Boulder, CO (US);
Baxter International Inc., Deerfield, IL (US);
Abstract
A medical infusion pump (10) for delivering liquids to a patient includes an elastomeric pump chamber (140) contractable between a refill position and a discharge position. An inlet valve (122) is operatively associated with an elastomeric inlet (142) supplying liquid to the pump chamber (140). The inlet valve (122) is selectively positionable in an open position permitting and a closed position preventing flow of liquid between the inlet (142) and the pump chamber (142). An outlet valve (124) is operatively associated with an elastomeric outlet (144) which conveys liquid from the pump chamber (140). The outlet valve (124) is selectively positionable in an open position permitting and a closed position preventing flow of liquid between the outlet (144) and pump chamber (140). A pump motor (256) and associated plunger (120) contracts and expands the pump chamber (140) between the refill position and the discharge position. An electronic control (542) operatively associated with the pump motor (256) and plunger (120) and the inlet and outlet (122, 124) valves actuates the pump motor (256) and the inlet and outlet valves (122, 124) to drive liquid through the pump chamber (140) in a predetermined pumping cycle. The electronic control (542) includes a routine for dissipating ballooning in the pump chamber (140), the inlet (142) or the outlet (144) by delaying movement of the pump motor (256) with the pump chamber (140) in the contracted position and the outlet valve (124) in the open position a select amount of time.