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:
Nov. 20, 2012
Filed:
Mar. 26, 2004
Michael W. Lawless, Ramona, CA (US);
Marwan A. Fathallah, Mundelein, IL (US);
Mansour A. Saleki, San Jose, CA (US);
Brian A. Kidd, San Francisco, CA (US);
Kent D. Abrahamson, Morgan Hill, CA (US);
Robert P. Cousineau, San Jose, CA (US);
Robert R. Boyd, Jacksonville, FL (US);
Howard L. Greene, Worthington, OH (US);
Michael W. Lawless, Ramona, CA (US);
Marwan A. Fathallah, Mundelein, IL (US);
Mansour A. Saleki, San Jose, CA (US);
Brian A. Kidd, San Francisco, CA (US);
Kent D. Abrahamson, Morgan Hill, CA (US);
Robert P. Cousineau, San Jose, CA (US);
Robert R. Boyd, Jacksonville, FL (US);
Howard L. Greene, Worthington, OH (US);
Hospira, Inc., Lake Forest, IL (US);
Abstract
A medical pump with a closed loop stroke feedback system and method, for use with a pumping chamber, for example in a cassette, is disclosed. The pump includes a pumping element that intermittently pressurizes a pumping chamber during a pumping cycle. A pressure sensor detects the pressure exerted by the pumping element on the pumping chamber. A position sensor detects the position of the pumping element. A processing unit processes pressure data from the pressure sensor and position data from the position sensor to determine a calculated stroke volume of the pump for a pump cycle, and to adjust a stroke frequency of the pump to compensate for variation in the stroke volume.