Device For Protecting An Injection Apparatus

• US 20080208140A1
• Filed: 09/10/2004
• Published: 08/28/2008
• Est. Priority Date: 09/26/2003
• Status: Active Grant

• Current Assignee: Becton Dickinson France (Becton, Dickinson & Co)
• Original Assignee: Becton Dickinson France (Becton, Dickinson & Co)
• Inventors: Barrelle, Laurent
• Granted Patent: US 7,682,344 B2
• Time in Patent Office: Days
• US Class Current: 604/198
• CPC Class Codes: A61M 2005/3264 Trigger provided at the proximal end, i.e. syringe end opposite to needle mounting end
• 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 5/326 Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user
• CPC Class Codes: A61M 5/3271 with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position

Abstract

Device (1) for protecting an injection apparatus (4) for injecting a product, the said apparatus comprising a needle (7) and a piston connected to an actuating rod surmounted by a piston head (19), the said device (1) comprising:

• • a support sleeve (2),
  • a protective sleeve (6) for protecting the needle (7),
  • the said device being characterized in that it comprises:
  • first retaining means (8, 10, 12, 13) for holding the protective sleeve (6) in its standby configuration in a first position
  • second retaining means (8, 14-17) for holding the protective sleeve (6) in its standby configuration in a second position,
  • an intermediate collar (18) comprising collaboration means (20) for collaborating with the piston head (19) of the injection apparatus (4) and deactivation means (23-25) for deactivating the said first and second retaining means (8, 10, 12-17),
  • the said second retaining means (8, 14-17) being able to be deactivated by the deactivation means (20) of the said intermediate collar (18) by the release of the pressure of the piston head (19) on the said collaboration means (20) of the said intermediate collar (18) to allow the protective sleeve (6) to deploy under the action of pushing means (26).

Claims

1. Device (1) for protecting an injection apparatus (4) for injecting a product, particularly a syringe, the said apparatus comprising a reservoir (32) fitted with a needle (7) at its distal end and a piston connected to an actuating rod surmounted by a piston head (19), the said device (1) comprising:

a support sleeve (2) comprising a body (3) able to accommodate the injection apparatus (4) and a proximal end part (5),

a protective sleeve (6) able to slide with respect to the support sleeve (2) between a retracted standby configuration in which the needle (7) is exposed and a deployed protective configuration in which it covers the needle (7),

the said device being characterized in that it comprises;

first retaining means (8, 10, 12, 13) for holding the protective sleeve (6) in its standby configuration in a first position, known as the injection position,

second retaining means (8, 14-17) for holding the protective sleeve (6) in its standby configuration in a second position, known as the end-of-injection position, which is appreciably offset in the distal direction with respect to the support sleeve (2),

an intermediate collar (18) situated in the proximal end part (5) of the support sleeve (2), able to slide with respect to this support sleeve (2) within the said proximal end part (5), the said collar (18) comprising means (20) of collaboration with the piston head (19) of the injection apparatus (4), and means (23-25) of deactivating the said first and second retaining means (8, 10, 12-17),

the said first retaining means (8, 10, 12, 13) being able to be deactivated by the said deactivation means (23-25) of the said intermediate collar (18) by pressure of the piston head (19) in the distal direction on the said means (20) of collaboration of the said intermediate collar (18) so as to cause the protective sleeve (6) to slide in its retracted standby configuration between the said first injection position and the said second end-of-injection position,

and the said second retaining means (8, 14-17) being able to be deactivated by the deactivation means (20) of the said intermediate collar (18) by release of the pressure of the piston head (19) on the said collaboration means (20) of the said intermediate collar (18) so as to allow the protective sleeve (6) to deploy under the action of pushing means (26).

2. Device (1) according to claim 1, characterized in that the means (20) of collaboration of the intermediate collar (18) with the piston head (19) comprise two diametrically opposed legs (20) running in the proximal direction, slightly offset from the body (21) of the collar (18) in the radial direction and connected to the proximal end of the collar (18) by radial bridges (22).

3. Device (1) according to claim 1 or 2, characterized in that the first retaining means (8, 10, 12, 13) comprise two diametrically opposed longitudinal bulges (8) formed on the internal surface (9) of the wall of the body (3) of the support sleeve (2), each bulge (8) at its proximal end comprising an internal retaining ramp (12) and two first tabs (10) running axially in the proximal direction from the proximal end (11) of the protective sleeve (6), each of the said first tabs (10) being provided at its proximal end with a projection (13) the distal face of which is inclined and able to rest on the internal ramp (12) of the proximal end of one said bulge (8).

4. Device (1) according to claim 3, characterized in that the second retaining means (8, 14-17) comprise a transverse retaining surface (14) situated at the proximal end of each bulge (8) facing the internal ramp (2) of the said bulge (8) and two second tabs (15) running in the proximal direction from the proximal end of the protective sleeve (6) along an axis slightly inclined with respect to the longitudinal axis of the injection apparatus (4), each second tab (15) being situated facing one said first tab (10), each second tab (15) being equipped at its proximal end with a hooked portion (16) the distal face (17) of which is able to rest against the transverse retaining surface (14) of the bulge (8) facing it.

5. Device (1) according to claim 4, characterized in that the deactivation means (23-25) for deactivating the first and second retaining means (8, 10, 12-17) are in the form of a surface (23) projecting radially from the body (21) of the collar (18), the said surface (23) being able to collaborate with the said first tabs (10) and with the said second tabs (15) to deflect them circumferentially.

6. Device (1) according to any one of the preceding claims, characterized in that the pushing means (26) are in the form of a spring (26) the proximal end of which bears against the distal end (27) of the intermediate collar (18) and the distal end of which bears against an annular rim (28) formed on the internal surface of the protective sleeve (6) at its proximal end.