Low radial profile needle safety device

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.

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 including 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 and a second arcuate profile;
• a collar including a central bore, a proximal collar end, a distal collar end and a first pin extending radially outwardly from the collar, the pin positioned in the track in the assembled configuration, the collar including a first finger, a second finger and a third finger, a first gap located between the first and second fingers and a second gap located between the second and third fingers, the first and second gaps extending through the distal collar end toward the proximal collar end, the first, second and third fingers being sufficiently compliant to flex from an initial configuration to an expanded configuration to allow passage of the hub through the central bore and then return to the initial configuration to secure the collar to the injection device;
• 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 initial segment 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.