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:
May. 22, 1984
Filed:
Nov. 12, 1981
Andrew F Farr, Spring Valley, CA (US);
IMED Corporation, San Diego, CA (US);
Abstract
Apparatus is provided for obtaining a controlled flow of fluid from a source to a patient. The apparatus includes a plunger movable vertically in a chamber and made from resilient material and having a pair of vertically spaced lands. The chamber defines a recess with the lands and the plunger in the space between the lands. Lubricating fluid is disposed in the recess. Fluid such as intravenous fluid is introduced into the chamber in one reciprocal movement of the plunger and is withdrawn from the chamber in the other reciprocal movement of the plunger. A porous washer filled with lubricating fluid is disposed in contiguous relationship to a particular one of the lands for providing an auxiliary reservoir of the lubricating fluid. Such washer may be contiguous to the lower one of the two (2) lands. The auxiliary reservoir may be yieldable and may be provided with an external dimension greater than the external dimension of the lands to facilitate a wiping action with the chamber during the vertical movement of the plunger in the chamber. Lubricating fluid passes upwardly from the washer into the recess during the upward movement of the plunger.