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:
Mar. 08, 1983
Filed:
Feb. 10, 1981
Stephen R Hessel, Monroe, CT (US);
Delmed, Inc., Canton, MA (US);
Abstract
A medical fluid flow rate controller and method for its use are disclosed. The controller is particularly suited for intravenous liquid administration and comprises three chambers in series between the intravenous liquid source and the patient. The first and second chambers are movable vertically with respect to each other and are gas phase pressure-equalized. Accordingly, the pressure differential available for flow from the first to the second chamber through the flow restrictor employed is known. Thus, the device may be precalibrated and marked with flow rates corresponding to different relative heights of the first chamber. Liquid entering the second chamber is pulled through a hydrophilic membrane into the third because the third operates at a lower pressure than the second. That configuration prevents the patient's movements from affecting the pre-set flow rate between the first and second chambers.