Two-chamber-type pre-filled syringe

Details Two-chamber-type pre-filled syringe Two-chamber-type pre-filled syringe

2007-12-25

2007-12-25

Sirmons, Kevin C. (Department: 3767)

Surgery

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

Treating material introduced into or removed from body...

C604S089000, C604S090000, C604S082000, C604S085000

Reexamination Certificate

active

10543139

ABSTRACT:
A dual-chamber type prefilled syringe comprises a cylindrical body within which a front plug member, a middle plug member and an end plug member are hermetically fitted to form a first chamber and a second chamber. The cylindrical body has an inner surface formed with a bypass. When the middle plug member moves to a position where the bypass is formed, the first chamber is communicated with the second chamber for the first time via the bypass. In this beginning state of liquid transfer (S), an inner volume (VS) of the cylindrical body between a leading end of the cylindrical body and a rear end of the front plug member is set to be at least 60% of a volume (VC) of a second component. When liquid component within the second chamber flows into the first chamber, it is possible to prevent part of the liquid component from passing through the first chamber to reach a portion for attaching an injection needle at a leading end of the cylindrical body.

REFERENCES:
patent: 4792329 (1988-12-01), Schreuder
patent: 5665068 (1997-09-01), Takamura
patent: 5935101 (1999-08-01), Kato et al.
patent: 6740060 (2004-05-01), Tanaka et al.
patent: 62-5357 (1987-01-01), None
patent: 6-14756 (1994-04-01), None
patent: 10-211280 (1998-08-01), None

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