Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1984-01-03
1986-03-04
Truluck, Dalton L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604231, A61M 106
Patent
active
045739692
ABSTRACT:
A breast pump for manual operation of the type comprising a receptacle that is put against the breast to surround a teat and has a variable enclosed volume in the manner of a cylinder-and-piston-pump which when operated in contact with a breast causes the milk to be drawn into the receptacle due to the suction generated by an enlargement of the enclosed volume.
The tubular part of the hollow piston is tapered such that its upper end has a smaller outer diameter than its lower end that carries an annular lip seal; consequently, the outer cylinder which is manipulated, i.e. moved to-and-fro relative to the hollow piston, can be tilted to some extent without concurrent tilting of the piston and the suction bell that is integrally connected therewith; thus, pump-induced motion of or at the sensitive area of teat and areola is minimized for improved user comfort. The suction bell is arranged at a predetermined angle with respect to the longitudinal axis of the tapered tubular part so that the outer cylinder can be held more nearly vertical when the pump is used in a normal sitting position; back-flow of the milk from the reservoir to the breast can be reduced or eliminated.
REFERENCES:
patent: 897289 (1908-09-01), Howell
patent: 3822703 (1974-07-01), Davisson
patent: 3977405 (1976-08-01), Yanase
patent: 4311141 (1982-01-01), Diamond
Beer Christian
Riedweg Robert
Schlensog Klaus
Ameda AG
Kleeman Werner W.
Truluck Dalton L.
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