Low radial profile needle safety device

Patent metadata

Field	Value
Publication number	US-11077259-B2
Application number	US-201816013144-A
Country	US
Kind code	B2
Filing date	Jun 20, 2018
Priority date	Mar 7, 2012
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A needle safety device has an outer tube within which a syringe barrel from which a cannula extends is slideably receivable. A collar in the outer tube is moveable relative thereto and rotatably attachable to the distal end of the barrel. A force member biases the outer tube in a distal direction. A cannula shield able to receive the cannula therein is in the outer tube. The cannula shield is fixedly attached to a cap removably attached to the outer tube. A track is formed in the inner surface of the outer tube. A pin extending radially outwardly from the collar slidingly engages the track. In a pre-injection position, the cannula is entirely within the outer tube. In a full-insertion position, the cannula extends beyond the outer tube. In a locked position, the cannula is irreversibly retained entirely within the outer tube.

First claim

We claim:

1. A needle safety device for an injection device having a generally cylindrical barrel with a distal end having a hub from which a cannula extends, the needle safety device comprising:
an outer tube within which the barrel is slideably receivable, the outer tube having a distal end, a proximal end spaced from the distal and a longitudinal axis along which the outer tube is movable in a distal extended direction and in a proximal retracted direction opposite the distal extended direction;
a track formed in an inner surface of the outer tube;
a collar within the outer tube and movable relative thereto, the collar attachable to the distal end of the barrel and having a radially outwardly extending collar pin slideably engaging the track;
a cannula shield within the outer tube, the cannula shield able to receive the cannula therein; and
a biasing member within the outer tube applying in the distal direction a biasing force to the outer tube,
wherein the cannula is in the cannula shield and entirely within the outer tube when the collar is attached to the distal end of the barrel and the collar pin is in a pre-injection position in the track proximal to the proximal end of the outer tube,
wherein the cannula extends beyond the distal end of the outer tube when the collar is attached to the distal end of the barrel, the cannula shield is removed from the outer tube and the collar pin is in a full-insertion position in the track proximal to the distal end of the outer tube; and
wherein the cannula is irreversibly retained entirely within the outer tube when the collar is attached to the distal end of the barrel and the collar pin is in a locking position in the track between the pre-injection position and the full-insertion position.

2. The needle safety device according to claim 1 , wherein the collar has a distal end with an annulus having a centrally positioned bore sized to receive and retain the distal end of the barrel.

3. The needle safety device according to claim 2 , wherein the collar is sufficiently compliant to allow passage of the hub of the barrel through the bore and thereafter to rotatably engage the hub.

4. The needle safety device according to claim 2 , wherein the collar is rotatably attached to the distal end of the barrel by a plurality of spaced-apart radially inwardly biased flexible members formed in the distal end of the collar.

5. A needle safety device for use with an injection device having a barrel, a needle with a tip and a hub, the needle safety device comprising:
an outer tube having a proximal end, a distal end and a longitudinal axis, a track formed in the outer tube between the proximal and distal ends, the outer tube having a proximal opening at the proximal end and a distal opening the distal end, the track including an initial segment and a post-injection segment, the initial segment having a staging catch, a first substantially straight segment extending generally parallel to the longitudinal axis and a first arcuate profile, the post-injection segment having a second substantially straight segment extending generally parallel to the longitudinal axis, a second arcuate profile and a retaining catch, the staging catch spaced laterally from the retaining catch on the outer tube;
a collar including a central bore and a pin extending radially outwardly from the collar, the central bore configured to receive and retain the distal barrel end of the injection device in an assembled configuration, the pin positioned in the track in the assembled configuration; and
a force member positioned between the collar and the outer tube biasing the distal end away from the collar and the hub in the assembled configuration, the pin positioned in the staging catch in a staging position such that the tip is positioned within the outer tube between the proximal and distal ends, the pin moving along the first substantially straight segment and the first arcuate profile between the staging position and a full insertion position wherein the outer tube translates along the longitudinal axis and rotates relative to the longitudinal axis such that the tip is exposed from the distal end in the full insertion position, the pin moving along the second substantially straight segment and the second arcuate profile between the full insertion position and a locked position wherein the outer tube translates along the longitudinal axis and rotates relative to the longitudinal axis such that the tip is positioned within the outer tube in the locked position, the pin positioned in the retaining catch in the locked position.

6. The needle safety device of claim 5 , wherein the initial segment includes a first track segment and a second track segment, a second catch positioned between the first track segment and the second track segment, the second track segment including at least a portion of the first arcuate profile.

7. The needle safety device of claim 5 , further comprising a staging track in the inner surface of the outer tube and extending from the proximal end of the outer tube to the first track segment initial track segment and configured to facilitate insertion of the collar pin in the initial track segment.

8. The needle safety device of claim 5 , wherein the staging catch is comprised of a first catch, the first catch positioned along the initial segment between the proximal end and the second catch.

9. The needle safety device of claim 5 , wherein the force member is comprised of a compressible coil spring.

10. The needle safety device of claim 5 , wherein the pin is comprised of a first pin and a second pin, the first pin being diametrically opposed to the second pin on the collar.

11. The needle safety device of claim 5 , wherein the initial segment includes a first track segment and a second track segment, the first track segment extending from the proximal end to the second segment and is formed in an inner surface of the outer tube.

12. The needle safety device of claim 5 , wherein the initial segment includes a cammed surface positioned between a first track segment and a second track segment, the needle safety device configured such that the pin travels along the first segment and is guided to a pre-injection position by the cammed surface that imparts an angular rotation to the collar, thereby releasably securing the pin in a second catch between the first and second track segments.

13. The needle safety device of claim 5 , wherein the outer tube includes a circumferential step extending radially inwardly toward the longitudinal axis from an inner surface of the outer tube proximate the distal end.

14. The needle safety device of claim 13 , wherein the force element is positioned between the circumferential step and the collar in the assembled configuration.

15. The needle safety device of claim 5 , wherein the collar includes a first finger, a second finger and a third finger, the first and second fingers separated by a first gap, the second and third fingers separated by a second gap.

16. The needle safety device of claim 5 , wherein the first, second and third fingers may each flex radially outwardly from the longitudinal axis in the assembled configuration.

17. The needle safety device of claim 5 , further comprising:
a shield removably mountable to the injection device to cover the tip in the assembled configuration.

18. A needle safety device for use with an injection device having a barrel, a needle with a tip and a hub, the needle safety device comprising:
an outer tube having a proximal end, a distal end and a longitudinal axi

Assignees

• West Pharmaceutical Services Inc

Inventors

• Evans Christopher
• Costello Brian
• Gieda Christopher
• Protasiewicz Raymond
• Meehan Kristofer

Classifications

• A61M5/3272 Primary

  having projections following labyrinth paths · CPC title

• A61M2005/3267

  Biased sleeves where the needle is uncovered by insertion of the needle into a patient's body · CPC title

• A61M5/3204

  Needle cap remover, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices · CPC title

• A61M5/326

  Fully automatic sleeve extension, i.e. in which triggering of the sleeve does not require a deliberate action by the user · CPC title