Title:
Automatic syringe
Document Type and Number:
Japanese Patent JP5990189
Kind Code:
B2
Abstract:
An auto-injector (1) for administering a dose of a liquid medicament (M) comprises
- a substantially cylindrical housing (2) arranged to contain a pre-filled syringe (5) with an injection needle (12), a plunger (9) and a stopper (10) for sealing a syringe barrel (11) and
- a drive means (8) releasably coupled to the plunger (9) for advancing the syringe (5) in the proximal direction (P) for needle insertion into an injection site and for displacing the dose of medicament (M) into the injection site. The drive means (8) is arranged to be decoupled from the plunger (9) for advancing a needle shroud (3) to a safe position (PS) to surround the injection needle (12) after the injection. According to the invention, the drive means (8) bears against a thrust collar (7) arranged to be releasably coupled to the plunger (9) through a ramped engagement of a first tongue (7.1) and a first recess (6.2) so as to rotate the thrust collar (7) on translation in proximal direction (P). At least one longitudinal gap (G1, G2) is provided for guiding at a first and/or second protrusion (7.2, 7.3) of the thrust collar (7) to prevent a rotation of the thrust collar (7). A circumferential gap (G3) is arranged to allow the thrust collar (7) to rotate out of engagement to the plunger (9) on removal of the auto-injector (1) from the injection site.
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Inventors:
Yannick Huamand
Simon Francis Blairton
Matthew Ekman
Simon Francis Blairton
Matthew Ekman
Application Number:
JP2013545332A
Publication Date:
September 07, 2016
Filing Date:
December 21, 2011
Export Citation:
Assignee:
Sanofi-Aventis Deutschland Gesellschaft Mitt Beschlenktel Haftung
International Classes:
A61M5/20; A61M5/315
Domestic Patent References:
| JP2007505677A | ||||
| JP2010532243A |
Foreign References:
| US20050222539 | ||||
| US20100280460 |
Attorney, Agent or Firm:
Junji Yuda
Noriyuki Takebayashi
Noriyuki Takebayashi