Liquid medicine injection apparatus utilizing negative pressure

Details Liquid medicine injection apparatus utilizing negative pressure Liquid medicine injection apparatus utilizing negative pressure

1999-03-22

2000-10-31

Yasko, John D.

Surgery

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

Treating material introduced into or removed from body...

604143, 604218, 604222, A61M 3700

Patent

active

061395307

ABSTRACT:
A liquid medicine injection apparatus which is capable of injecting a liquid medicine at an accurate flow rate and which does not require an excessively strong force for filling the apparatus with the liquid medicine. The apparatus includes a barrel 1 provided with a port 11 at the distal end thereof and a shaft 12 extending along the longitudinal axis thereof, a hollow plunger 2 provided at its distal end with a first gasket 3 inserted into the barrel 1 while allowing the shaft 12 of the barrel to pass therethrough, and also provided at the proximal end thereof with a closing member 4 having a vent hole 41; a second gasket 5 connected to the proximal end of the shaft 12; and outside air releasing means 6 for allowing the space between the first and second gaskets to communicate with the outside air. With such an arrangement, a liquid medicine is filled into the barrel 1 due to a negative pressure generated in a third space 25 when the plunger 2 is advanced while the liquid medicine is expelled outside due to a vacuum generated in a second space 24 when the plunger 2 is moved backward.

REFERENCES:
patent: 5769824 (1998-06-01), Hjertman et al.
patent: 5807337 (1998-09-01), Yamada et al.
patent: 5810778 (1998-09-01), Hjertman et al.

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