Liquid medicine injection apparatus utilizing negative pressure
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Mar 22, 1999
filing date -
Mar 27, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully