发明名称 |
IMPROVEMENTS IN AND RELATING TO AN INJECTION DEVICE |
摘要 |
Injection devices are known for the self administration of medicament by patients in which medicament is typically contained within a cartridge locat ed within the injection device. It is a problem that injection devices should b e small enough to fit into a jacket pocket or a hand bag without difficulty. Also, the injection device must be of a size that enables a piston or simila r used to drive a cartridge bung within the cartridge to be moved both to a maximum dispense position within the cartridge and to be fully withdrawn fro m the cartridge to allow for replacement of the cartridge. A drive mechanism f or an injection device is disclosed in which a second piston (42) is successive ly moved in relation to a first end of a medicament cartridge (8) containing a medicament selectively to drive a bung (10) into the medicament cartridge (8 ), the drive mechanism comprising a means (36) defining a passageway (38), a first piston (40) and the second piston (42), in which the passageway (38) h as a first end and a second end, the first piston (40) closing the first end of the passageway (38) and a first end of the second piston (42) closing the second end of the passageway (38) to define a chamber in the passageway (38) , a non-compressible medium being contained within the chamber such that a fir st relative movement in a first direction at the first end of the passageway (3 8) results in a second relative movement in a direction opposite the first direction at the second end of the passageway (38).
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申请公布号 |
CA2439906(A1) |
申请公布日期 |
2002.10.03 |
申请号 |
CA20022439906 |
申请日期 |
2002.03.26 |
申请人 |
DCA DESIGN INTERNATIONAL LIMITED |
发明人 |
LANGLEY, CHRISTOPHER NIGEL;WOOLSTON, ROBERT |
分类号 |
A61M5/24;A61M5/315;(IPC1-7):A61M5/315 |
主分类号 |
A61M5/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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