Needle shield puller for drug delivery system
A device for removing a protective shield such as a needle shield is disclosed. The device includes a cup shaped body with a sidewall, a distal bottom wall and a proximal opening. The protective shield is insertable into the cup shaped body through its proximal opening. Fingers are disposed opposite each other in openings in the sidewall. The fingers are flexibly coupled with the sidewall at a proximal end of the finger and can be resiliently biased inwardly to engage the protective shield. Each finger includes at least one projection for engaging the protective shield. The fingers may also include a distal engagement surface for engaging a lip on the protective shield.
1. A drug delivery system comprising:
a drug delivery mechanism including a medicament container, an injection needle in communication with the medicament container, a drive assembly for dispensing medicament from the medicament container through the injection needle;
a protective shield disposed about the injection needle; and
a puller device configured to remove the protective shield, the device comprising:
a puller body having a sidewall that circumscribes an interior space about a longitudinal axis, a distal bottom wall interconnected to the sidewall, and a proximal end opening in communication with the interior space, the protective shield being insertable into the interior space through the proximal end opening, wherein the sidewall defines sidewall openings therein;
a plurality of resilient fingers, each resilient finger of the plurality of resilient fingers disposed in a corresponding sidewall opening of the sidewall openings defined in the sidewall and located opposite each other relative to the interior space, each resilient finger of the plurality of the resilient fingers having a finger proximal end flexibly coupled with the sidewall and extending distally toward the distal bottom wall to a finger distal end; and
each resilient finger of the plurality of resilient fingers further including at least one projection extending toward the interior space and engaging the protective shield in a manner to facilitate removal of the protective shield during removal of the puller device.
2. The system of claim 1 , wherein the at least one projection comprises a plurality of projections disposed along each resilient finger of the plurality of resilient fingers, each projection of the plurality of projections including a proximal surface and a distal surface.
3. The system of claim 2 , wherein the distal surface of a distalmost projection of the plurality of projections of each resilient finger of the plurality of resilient fingers defines a distal engagement surface, the distal engagement surface extends farther radially outward than the distal surface of at least one of the other projections of the plurality of projections.
4. The system of claim 3 , wherein the sidewall openings extend distally beyond the finger distal end of the resilient finger of the plurality of resilient fingers disposed therein by a distance at least as great as the greater of a circumferential width of each resilient finger of the plurality of resilient fingers disposed therein and 50% of a distance between the finger proximal and distal ends of each resilient finger of the plurality of resilient fingers disposed therein, and wherein each resilient finger of the plurality of resilient fingers is integrally formed with the sidewall, wherein the finger proximal end of each resilient finger of the plurality of resilient fingers is flexibly coupled with the sidewall by a living hinge.
5. The system of claim 3 , wherein each resilient finger of the plurality of resilient fingers has an outwardly facing surface that defines a pair of axial ridges that are disposed on opposite circumferential sides of a recess defined within the outwardly facing surface of each resilient finger of the plurality of resilient fingers, wherein the recess has a radially outwardly facing bottom wall that is disposed radially inwardly of an exterior surface of the sidewall.
6. The system of claim 5 , wherein the exterior surface of the sidewall at opposing ends defines a first diameter, each of the axial ridges comprising outwardly facing surfaces that defines a second diameter, the radially outwardly facing bottom walls of the recesses on each resilient finger of the plurality of resilient fingers define a third diameter, and wherein the second diameter is greater than the first diameter, the first diameter is greater than the third diameter, and each of the recesses defined within each resilient finger of the plurality of resilient fingers defines a proximal limit spaced distally of the proximal end of each respective resilient finger.
7. The system of claim 6 , wherein the sidewall openings extend distally beyond the distal end of each resilient finger of the plurality of resilient fingers disposed therein by a distance at least as great as the greater of the circumferential width of each resilient finger of the plurality of resilient disposed therein and 50% of a distance between the finger proximal and distal ends of each resilient finger of the plurality of resilient fingers disposed therein, and wherein each resilient finger of the plurality of resilient fingers is integrally formed with the sidewall whereby each resilient finger of the plurality of resilient fingers is flexibly coupled with the sidewall by a living hinge;
wherein, for each resilient finger of the plurality of resilient fingers, the proximal surfaces of the plurality of projections are all parallel and the distal surfaces of the plurality of projections are all parallel, and wherein, for each resilient finger of the plurality of resilient fingers, the distal surface of the distalmost projection of the plurality of projections on the resilient finger defines the distally facing engagement surface of the resilient finger; and
wherein, for each resilient finger of the plurality of resilient fingers, a radially outer limit defined by the distally facing engagement surface is disposed radially outwardly of the radially outwardly facing bottom wall of the recess disposed on the resilient finger.
8. The system of claim 1 , wherein the puller body comprises a cup-shaped body that is defined by the sidewall and the distal bottom wall.
9. The system of claim 1 , wherein the at least one projection comprises a plurality of projections disposed along each resilient finger of the plurality of resilient fingers, each projection of the plurality of the projections including a proximal surface and a distal surface, the proximal surfaces of all of the plurality of projections are in parallel and the distal surfaces of all of the plurality of projections are in parallel.
10. The system of claim 9 , wherein the proximal and distal surfaces of each projection of the plurality projections extend between a first radial inner limit and a first radial outer limit, wherein each resilient finger of the plurality of resilient fingers further includes a distally facing engagement surface disposed at the distal end of the resilient finger, wherein the distally facing engagement surface extends between a second radial inner limit and a second radial outer limit, the second radial outer limit being disposed radially farther than the first radial outer limit.
11. The system of claim 10 , wherein the distal surface of a most distal projection of the plurality of projections of each resilient finger of the plurality of resilient fingers defines the distally facing engagement surface.
12. The system of claim 1 , wherein the sidewall openings extend distally beyond the finger distal end of each resilient finger of the plurality resilient fingers disposed therein by a distance of at least as great as a circumferential width of each resilient finger of the plurality of resilient fingers disposed therein.
13. The system of claim 1 , wherein each resilient finger of the plurality of resilient fingers is integrally formed with the sidewall, wherein the finger proximal end of each resilient finger of the plurality of resilient fingers is flexibly coupled with the sidewall by a living hinge.
14. The system of claim 1 , wherein the medicament container contains a medication.
15. The system of claim 1 , wherein the sidewall of the puller body fully circumscribes the interior space proximal to and distal to the sidewall openings.
16. A drug delivery system comprising:
a drug delivery mechanism including a medicament container, an injection needle in communication with the medicament container, a drive assembly for dispensing medicament from the medicament container through the injection needle;
a protective shield disposed about the injection needle; and
a puller device comprising: a cup shaped body defining an axis and having a sidewall that circumscribes an interior space, a distal bottom wall and a proximal end opening in communication with the interior space, the protective shield inserted into the interior space through the proximal end opening, the sidewall defining sidewall openings, a pair of fingers, each finger of the pair of fingers disposed in a corresponding one of the sidewall openings and located opposite each other relative to the interior space, each finger of the pair of fingers being flexibly coupled with the sidewall at a proximal end of each finger of the pair of fingers, each finger of the pair of fingers further including a plurality of projections extending in a circumferential direction in parallel to one another and projecting toward the interior space whereby the plurality of projections on each finger of the pair of fingers are grippingly engaged with the protective shield to thereby facilitate removal of the protective shield, wherein each projection of the plurality of projections on each finger of the pair of fingers includes a proximally facing surface and a distally facing surface, the proximally and distally facing surfaces extending between a first radially inner limit and a first radially outer limit of each projection of the plurality of projections, and wherein each finger of the pair of fingers further includes a distally facing engagement surface disposed near a distal end of each respective finger, wherein each of the distally facing engagement surfaces extends between a second radially inner limit and a second radially outer limit, wherein the second radially outer limit is disposed farther radially outwardly of the first radially outer limit.
17. The system of claim 16 , wherein the distally facing surface of a most distal projection on each finger of the pair of fingers defines the distally facing engagement surface of the respective finger.
18. The system of claim 16 , wherein the sidewall openings extend distally beyond the distal end of each finger of the pair of fingers disposed therein by a distance at least as great as the greater of a circumferential width of the finger disposed therein or 50% of a distance between the proximal and distal ends of the respective finger disposed therein.
19. The system of claim 16 , wherein each finger of the pair of fingers is integrally formed with the sidewall, whereby each finger of the pair of fingers is flexibly coupled with the sidewall by a living hinge.
20. The system of claim 16 , wherein each finger of the pair of fingers has an outwardly facing surface that defines a pair of ridges surrounding a recess, the pair of ridges axially extending along opposite circumferential sides of the recess, wherein the recess has a radially outwardly facing bottom wall.
21. The system of claim 20 , wherein an exterior surface of the sidewall defines a first diameter, each of the pair of ridges comprises an outwardly facing surface that defines a second diameter, the bottom wall of the recess of each finger of the pair of fingers defines a third diameter, and wherein the second diameter is greater than the first diameter, the first diameter is greater than the third diameter, and wherein the recess of each finger of the pair of fingers defines a proximal limit that is spaced distally of the proximal end of each respective finger.
22. A drug delivery system comprising:
a drug delivery mechanism including a medicament container, an injection needle in communication with the medicament container, a drive assembly for dispensing medicament from the medicament container through the injection needle;
a protective shield disposed about the injection needle; and
a puller device configured to remove the protective shield, the device comprising:
a puller body having a sidewall that circumscribes an interior space about a longitudinal axis, a distal bottom wall interconnected to the sidewall, and a proximal end opening in communication with the interior space, the protective shield being insertable into the interior space through the proximal end opening, wherein the sidewall defines sidewall openings therein;
a plurality of resilient fingers, each resilient finger of the plurality of resilient fingers disposed in a corresponding sidewall opening of the sidewall openings defined in the sidewall and located opposite each other relative to the interior space, each resilient finger of the plurality of the resilient fingers having a finger proximal end flexibly coupled with the sidewall and extending distally toward the distal bottom wall to a finger distal end; and
each resilient finger of the plurality of resilient fingers further including a plurality of projections axially arranged and extending toward the interior space and engaging the protective shield in a manner to facilitate removal of the protective shield during removal of the puller device, each projection of the plurality of projections having a proximal surface and a distal surface, wherein the distal surface of a distalmost projection of the plurality of projections of each respective resilient finger defines a distal engagement surface, the distal engagement surface extends farther radially outward than the distal surface of at least one of the other projections of the plurality of projections.
23. The system of claim 22 , wherein each resilient finger of the plurality of resilient fingers has an outwardly facing surface that defines a pair of ridges extending axially and defining a recess therebetween, the pair of axially extending ridges disposed on opposite circumferential sides of the recess, wherein the recess has a radially outwardly facing bottom wall that is disposed radially inwardly of an exterior surface of the sidewall.
24. The system of claim 23 , wherein the sidewall openings extend distally beyond the finger distal end of the resilient finger of the plurality of resilient fingers disposed therein by a distance to define a gap.
25. The system of claim 22 , wherein the sidewall of the puller body fully circumscribes the interior space proximal to and distal to the sidewall openings.