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:
Oct. 26, 1993
Filed:
Apr. 01, 1991
Applicant:
Inventors:
Denis Y Yerlikaya, Des Peres, MO (US);
Randall J Krohn, Ballwin, MO (US);
Assignee:
Sherwood Medical Company, St. Louis, MO (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61M / ;
U.S. Cl.
CPC ...
604246 ; 604251 ; 604 67 ; 128D / ;
Abstract
A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and an electro-optical sensor. A photodiode detects drops passing through its optical sensing path, and a capacitor is connected between the photodiode and an amplifier to block the DC component of the diode signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber.