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:
Jul. 02, 2002
Filed:
Sep. 17, 1999
Henri J. R. Maget, La Jolla, CA (US);
Baxter International Inc, Deerfield, IL (US);
Abstract
A fluid dispensing device and its method of operation are disclosed. The device includes a feedback system which allows the device to respond in a timely and measured manner to changes in the dispensing flow rate of fluid from the device. The feedback system operates effectively even under conditions where the cause of increase or decrease in flow rate is not unequivocally known or reasonably capable of direct measurement. The device has a fluid reservoir which has an outlet which optionally may have a flow or pressure resistance unit incorporated, into the outlet, and an electric (preferably electrochemical) gas generation module or reversible pump which provides gas pressure to dispense the fluid from the reservoir. A sensor is provided for detection and measurement of an internal or external operating parameter which is indicative of flow rate of the fluid being dispensed. Feedback from the sensor (and associated signal processing unit) is used by a controller to control electric current to the gas generation module, with the current being adjusted by the controller to adjust the amount of gas produced in a manner which will prevent the flow rate of the dispensed fluid from exceeding desired maximum or minimum limits.