Breastpump having improved valve mechanism

Details Breastpump having improved valve mechanism Breastpump having improved valve mechanism

1988-11-30

1990-05-29

Apley, Richard J.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604320, 604346, 119 1425, 119 1432, 137511, 137907, A61M 100

Patent

active

049292293

ABSTRACT:
An improved breastpump has a valve which closes off a path to a milk container in the presence of a negative pressure in the valve, and opens the path when the pressure is removed. The valve consists of a housing and a thin flexible membrane that is removably attached to the valve housing and covers a first opening in the housing through which milk can flow. The thin flexible membrane is preferably circular in shape with a knob formed in its center. The knob fits in a second opening in the housing in a snap-fit. This construction for the membrane assumes that it can never be mounted improperly. Raised bosses in the form of cone-shaped elevations are arranged around the perimeter of the flexible membrane. The cone-shaped bosses reinforce the membrane material and prevent the membrane from being drawn into the first opening.

REFERENCES:
patent: 1156202 (1915-10-01), Barrett
patent: 1184293 (1916-05-01), Zeratsky
patent: 1184631 (1916-05-01), Leon
patent: 1259309 (1918-03-01), Somers
patent: 3583434 (1971-06-01), Muller
patent: 4013076 (1977-03-01), Puderbaugh et al.
patent: 4111204 (1978-09-01), Hessel
patent: 4311141 (1982-01-01), Diamond
patent: 4323067 (1982-04-01), Adams
patent: 4673388 (1987-06-01), Schlensog et al.

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