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:
Jan. 11, 1994
Filed:
Jan. 11, 1993
Richard N Cooper, Lake Oswego, OR (US);
Other;
Abstract
The invention is directed to a hand-operated vacuum pump and more specifically, a hand-held and hand-operated vacuum pump for obstetrical use incorporating an improved vacuum regulation system. The hand-held and hand-operated vacuum pump comprises a cylinder, having a piston located therewithin. The piston is movable between extended and retracted positions by a hand-operated lever. There is a first passage extending into the cylinder from an external space to be evacuated. The space is defined by the scalp of a baby and a vacuum cranial bell fitted thereon. A second passage connects this intermediate chamber with the cylinder through a first valve, preferably a one-way valve located in the cylinder head. A third passage connects the intermediate chamber to a second valve which automatically controls the maximum vacuum in the external space. A fourth passage from the intermediate chamber is a vacuum adjustment valve.