The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 31, 2000
Filed:
Mar. 22, 1999
Katsuhiro Hiejima, Osaka, JP;
Takeshi Mori, Osaka, JP;
Nissho Corporation, Osaka, JP;
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.