DEVICE FOR PROTECTION OF THE NEEDLE FOR A SYRINGE AND INJECTION DEVICE COMPRISING A SYRINGE AND SAID PROTECTION DEVICE

• US 20080021409A1
• Filed: 09/26/2007
• Published: 01/24/2008
• Est. Priority Date: 03/25/2003
• Status: Active Grant

• Current Assignee: Tech Group Europe Limited (West Pharmaceutical Services Incorporated)
• Original Assignee: SEDAT Co.
• Inventors: PESSIN, Olivier
• Granted Patent: US 8,845,595 B2
• Time in Patent Office: Days
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 5/3257 Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means
• CPC Class Codes: A61M 5/3272 having projections following labyrinth paths

Abstract

The needle protection device comprises: a protector support (20), defining an introduction duct for a syringe body, a needle protector (22) which may be displaced relative to the protector support (20), between a retracted position and a deployed position, a compression spring (24), applied between the protector support (20) and the needle protector (22) and initial retaining means (38, 40, 54) for the needle protector (22) against the force of the compressed spring (24), said means (38, 40, 54) being released by displacement of the needle protector (22) in a release direction with relation to the protector support (20). The device further comprises mechanical locking means (56) for the needle protector (22) with relation to the protector support (20) in the release direction in the absence of a syringe body in the protector support duct and said mechanical locking means (56) may be deactivated by engaging a syringe body in the duct on the protector support (20).

Claims

1. A needle protection device comprising:

a protector support (20) delimiting a passage for 5 accepting a syringe body (4);

a needle protector (22) able to move with respect to the protector support (20) between a retracted position and a deployed position;

a compression spring (24) pressing between the 10 protector support (20) and the needle protector (22); and

retaining means (38, 40, 54) for initially restraining the needle protector (22) against the action of the compressed spring (24), which means (38, 40;

54) can be released by moving the needle protector (22) with respect to the protector support (20) in a release direction, characterized in that it comprises mechanical immobilizing means (56) for immobilizing the needle protector (22) with respect to the protector support (20) in the release direction when no syringe body is present in the passage of the protector support, which mechanical immobilizing means (56) can be deactivated by engaging a syringe body (4) in the passage of the protector support (20).

2. The needle protection device as claimed in claim 1, characterized in that the mechanical immobilizing means comprise at least one hook (56) secured to a first element chosen from the protector (22) and the support (20), the or each hook being able to be moved between an immobilizing position in abutment against the second element chosen from the protector (22) and the support (20) when no syringe is present and a mobilizing position away from the second element chosen from the protector (22) and the support (20) when a syringe is present, the or each hook (56) having an actuating face (56B) actuated by the syringe body (4) as it is engaged in the passage of the support (20) to move the hook (56) from its immobilizing position to its mobilizing position.

3. The needle protection device as claimed in claim 2, characterized in that the or each hook (56) has a protrusion projecting into the passage of the protector support (20) when the syringe body (4) is not present.

4. The needle protection device as claimed in claim 2, characterized in that the or each hook (56) is secured to the needle protector (22).

5. The needle protection device as claimed in claim 4, characterized in that the or each hook (56) has a cam surface (56B) and the protector support (20) comprises at least one ramp (57) able to collaborate with the or each cam surface (56B) to cause the or each hook (56) to become effaced on the outside of the protector support (20).

6. The needle protection device as claimed in claim 2, characterized in that the protector support (20) comprises a distal surface (44B) able to collaborate with the or each hook (56) to keep the protector (20) in the deployed position.

7. An injection device comprising, on the one hand, a syringe (1) which comprises a needle (6), a tubular body (4) to the distal end of which a needle (6) is fixed, and an injection piston (8) slidably mounted in the body (4) and, on the other hand, a needle protection device (2) as claimed in claim 1.