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:
Apr. 11, 1995
Filed:
Oct. 29, 1993
Walter L Jimison, Palo Alto, CA (US);
Craig S Barker, San Carlos, CA (US);
Marc R Bunyard, Milipitas, CA (US);
Abbott Laboratories, Abbott Park, IL (US);
Abstract
Risk of hydrodynamic pressure noise interference with a valve leakage test conducted upon a plurality of valves within a pump assembly is minimized. A pressure sensor within the pump assembly produces a signal indicative of hydrodynamic pressure in fluid distal of an outlet valve of the pump. The signal produced by the pressure sensor is input to a microcontroller that controls the pump assembly. Prior to conducting the valve leakage test, the hydrodynamic pressure level of the fluid is sampled at a frequency that is at least twice that of the hydrodynamic noise. The microcontroller determines if a maximum of the samples of the hydrodynamic pressure level taken during a data interval is above a predetermined threshold. If so, the valve leakage test is suppressed until the maximum pressure level is below the predetermined threshold during a successive data interval. If the hydrodynamic pressure noise level fails to fall below the predetermined threshold within several data intervals, an alarm alerts an operator of a noise fault condition.