Title:
LIQUID MEDICINE INJECTING DEVICE USING NEGATIVE PRESSURE
Document Type and Number:
Japanese Patent JP3416943
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a liquid medicine injecting device that can inject the liquid medicine of correct amount and does not need an excess power to fill it with the liquid medicine.
SOLUTION: The liquid medicine injecting device consists of a barrel 1 which consists of a port 11 at the top end and an axial part 12 on the central axis, hollow plunger 2 which mounts the first gasket 3 that is inserted to the barrel 1 as it penetrates the axial part 12 at the top end and which is closed by closing part 4 that has opening 41 for ventilation at the basic end, the second gasket 5 which is inserted into an inner lumen of the plunger 2 and connected with the basic end of the axial part 12, and air releasing device 6 which releases the air between the first gasket 3 and the second gasket 5 outward. When the plunger 2 is pushed forward, as negative pressure in the third space 25 is generated, liquid medicine can be filled. When the plunger 2 is drawn backward, as the vacuum in the second space 24 is generated, liquid medicine can be discharged.
Inventors:
Norihiro Hiejima
Takeshi Mori
Takeshi Mori
Application Number:
JP8087598A
Publication Date:
June 16, 2003
Filing Date:
March 27, 1998
Export Citation:
Assignee:
Nipro Co., Ltd.
International Classes:
A61M5/145; A61M5/20; (IPC1-7): A61M5/145; A61M5/20
Other References:
【文献】国際公開95/028977(WO,A1)