Protected injection syringe device

• US 9,314,575 B2
• Filed: 10/18/2004
• Issued: 04/19/2016
• Est. Priority Date: 10/22/2003
• Status: Active Grant

• Current Assignee: Tech Group Europe Limited (West Pharmaceutical Services Incorporated)
• Original Assignee: Tech Group Europe Limited (West Pharmaceutical Services Incorporated)
• Inventors: Chevallier, Stphane
• Primary Examiner(s): Mehta, Bhisma
• Assistant Examiner(s): SCHELL, LAURA C
• Application Number:
  US10/576,938
• Publication Number:
  US 20070179441A1
• Time in Patent Office: 4,201 Days
• Field of Search: 604/110, 604/192, 604/197, 604/198
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/31508 provided on the piston-rod
• CPC Class Codes: A61M 2005/3247 Means to impede repositioning of protection sleeve from needle covering to needle uncovering position
• CPC Class Codes: A61M 2005/3261 triggered by radial deflection of the anchoring parts between sleeve and syringe barrel, e.g. spreading of sleeve retaining hooks having slanted surfaces by engagement with conically shaped collet of the piston rod during the last portion of the injection stroke of the plunger
• 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 5/3135 characterised by constructional features of the proximal end
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• CPC Class Codes: A61M 5/3202 Devices for protection of the needle before use, e.g. caps A61M5/50 takes precedence; for infusion spikes A61M5/1626; protectors for sharps A61B50/3001
• CPC Class Codes: A61M 5/3243 being axially-extensible, e.g. protective sleeves coaxially slidable on the syringe barrel devices for protecting guide needles in combination with catheters A61M25/0612
• 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

Abstract

The device comprises a syringe (10, 11, 12) and safety means comprising a protective sheath (16) capable of adopting, relative to the syringe body, both an injection configuration in which the syringe needle (11) projects beyond said sheath, and a protection configuration in which the needle extends inside the sheath. The device includes a trigger member (30) enabling it to pass from the injection configuration to the protection configuration at the end of the injection stroke. It comprises means (34) for defining a first end-of-injection-stroke situation in which the trigger member (30) is unsuitable for causing the device to pass from the injection configuration to the protection configuration, and a second end-of-injection-stroke situation in which such passage is possible.

Claims

1. A safe injection device comprising

a syringe having a syringe body, a needle, and a piston suitable for moving in the body to perform an injection, the piston having a piston head at one end distal to the needle and

a support sheath disposed around the syringe body and holding the syringe body in a stationary manner,

a protective sheath disposed in an annular space between the syringe body and the support sheath and extending therebetween,

the protective sheath being displaceable relative to the syringe body and the support sheath between an injection configuration in which the needle projects beyond the protective sheath, and a protection configuration in which the needle extends inside the protective sheath,

a trigger member suitable for causing the protective sheath to slide from the injection configuration to the protection configuration at an end of an injection stroke, the trigger member being located at the piston head secured to the piston, and

an inhibitor member received within a slot of the piston head, the inhibitor member being suitable for occupying an inhibit position, wherein the piston has reached a first end-of-injection-stroke position in which the syringe body is substantially emptied of air or liquid and the trigger member is unable to cause the protective sheath to slide from the injection configuration to the protection configuration, and the inhibitor member is completely removable from the piston at said inhibit position, to enable the piston to reach a second end-of-injection-stroke position in which the trigger member is able to cause the protective sheath to slide from the injection configuration to the protection configuration,

wherein in the inhibit position, the inhibitor member includes an actuator head to allow a user to advance the piston that is constrained to move therewith and configured for co-operating in abutment with an element of the device that is stationary relative to the needle to define the first end-of-injection-stroke position, and the inhibitor member is configured to be separated from the piston head to enable the second end-of-injection-stroke position to be reached.

2. A safe injection device comprising

a syringe having a syringe body, a needle, and a piston suitable for moving in the body to perform an injection, the piston having a piston head at one end distal to the needle, and

a support sheath disposed around the syringe body and holding the syringe body in a stationary manner,

a protective sheath disposed in an annular space between the syringe body and the support sheath and extending therebetween,

the protective sheath being displaceable relative to the syringe body and the support sheath between an injection configuration in which the needle projects beyond the protective sheath, and a protection configuration in which the needle extends inside the protective sheath,

a trigger member suitable for causing the protective sheath to slide from the injection configuration to the protection configuration at an end of an injection stroke, the trigger member being secured to the piston at the piston head, and

an inhibitor member received within a slot of the piston head, the inhibitor member being suitable for occupying an inhibit position, wherein the piston has reached a first end-of-injection-stroke position in which the syringe body is substantially emptied of air or liquid and the trigger member is unable to cause the protective sheath to slide from the injection configuration to the protection configuration, and the inhibitor member is removable from a remainder of the device while at said inhibit position to enable the piston to reach a second end-of-injection-stroke position in which the trigger member is able to cause the protective sheath to slide from the injection configuration to the protection configuration,

wherein in the inhibit position, the inhibitor member includes an actuator head to allow a user to advance the piston, being constrained to move therewith and is suitable for co-operating in abutment with an element of the device that is stationary relative to the needle to define the first end-of-injection-stroke position, and the inhibitor member is configured for being displaced relative to the piston head to enable the second end-of-injection-stroke position to be reached.

3. A safe injection device comprising

a syringe having a syringe body, a needle, and a piston suitable for moving in the body to perform an injection, the piston having a piston head at one end distal to the needle, and

a support sheath disposed around the syringe body and holding the syringe body in a stationary manner,

a protective sheath disposed in an annular space between the syringe body and the support sheath and extending therebetween,

the protective sheath being displaceable relative to the syringe body and the support sheath between an injection configuration in which the needle projects beyond the protective sheath, and a protection configuration in which the needle extends inside the protective sheath,

a trigger member secured to the piston and positioned at the piston head for causing the protective sheath to slide from the injection configuration to the protection configuration at an end of an injection stroke,

an inhibitor member including an actuator head, the inhibitor member being received within a slot of the piston head and occupying an inhibit position, the inhibitor member defining a first end-of-injection-stroke situation in which the trigger member is unable to cause the device to pass from the injection configuration to the protection configuration, and a second end-of-injection-stroke situation in which the trigger member is able to cause the device to pass from the injection configuration to the protection configuration, the trigger member being constrained to move with the piston, and said first and second end-of-injection-stroke situations corresponding respectively to first and second end-of-injection-stroke positions for the piston, the inhibitor member remaining in a fixed position until occurrence of the first end-of-injection-stroke situation, and

a housing in which the piston head is substantially retracted in the second end-of-injection-stroke position, whereas, in the first end-of-injection-stroke position, the piston head projects beyond said housing to provide a purchase enabling the piston to be pulled away from the needle.

4. A device according to claim 3, wherein the inhibitor member is suitable for being moved relative to said inhibit position to define said second end-of-injection-stroke situation.

5. A device according to claim 3, wherein in the inhibit position, the inhibitor member is connected to the piston being constrained to move therewith, and is suitable for co-operating in abutment with an element of the device that is stationary relative to the needle in order to define the first end-of-injection-stroke position.

6. A device according to claim 5, wherein the inhibitor member is suitable for being separated from the piston, in order to enable the second end-of-injection-stroke position to be reached.

7. A device according to claim 5, wherein the inhibitor member is suitable for being displaced relative to the piston, in order to enable the second end-of-injection-stroke position to be reached.

8. A device according to claim 5, wherein the trigger member is located at the piston head, and the inhibitor member is connected to said piston head in the inhibit position.

9. A device according to claim 8, wherein, in the inhibit position, the inhibitor member extends into the piston head.

10. A safe injection device comprising

a syringe having a syringe body, a needle, and a piston suitable for moving in the body to perform an injection, the piston having a head that includes a slot, and

a support sheath disposed around the syringe body and holding the syringe body in a stationary manner,

a protective sheath disposed in an annular space between the syringe body and the support sheath and extending therebetween,

the protective sheath being displaceable relative to the syringe body and the support sheath between an injection configuration in which the needle projects beyond the protective sheath, and a protection configuration in which the needle extends inside the protective sheath,

a trigger member suitable for causing the protective sheath to slide from the injection configuration to the protection configuration at an end of an injection stroke, the trigger member being formed by a skirt secured to the piston at the piston head,

an inhibitor member formed by a part that, in an inhibit position, is removably fitted on the head of the piston and received within the slot of the head of the piston and presents an end suitable for coming into abutment against an element that is stationary relative to the needle in order to define a first end-of-injection-stroke position for the piston in which the skirt is unable to cause the device to pass from the injection configuration to the protection configuration, and that is suitable for being separated from the piston in order to enable a second end-of-injection-stroke position of the piston to be reached in which the skirt is able to cause the device to pass from the injection configuration to the protection configuration, the inhibitor member remaining fitted to the head of the piston until occurrence of the first end-of-injection-stroke position.

11. A device according to claim 10, wherein, in the inhibit position, an inhibitor part of the inhibitor member extends into the head of the piston.