Hand-held and hand-operated vacuum pump

Details Hand-held and hand-operated vacuum pump Hand-held and hand-operated vacuum pump

1993-01-11

1994-01-11

Bertsch, Richard A.

Pumps

Expansible chamber type

Having separate noncyclic valve

417305, 417569, 606123, F04B 2300

Patent

active

052775577

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.

REFERENCES:
patent: 3612722 (1971-10-01), Neward
patent: 3794044 (1974-02-01), Vennard et al.
patent: 4565506 (1986-01-01), Williams
patent: 4775302 (1988-10-01), Neward
patent: 4806084 (1989-02-01), Neward
patent: 4954054 (1990-09-01), Neward
patent: 5011381 (1991-04-01), Neward

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