AUTO-INJECTION DEVICE

Abstract

The present invention relates to an autoinjector device (10) for use in combination with a syringe (30), said syringe 0 comprising a movable plunger; a needle; and a tubular needle shield (34). The claimed autoinjector device (10) comprises: an elongated housing having a proximal (11) and a distal end (12); a drive mechanism; a syringe holder (40) in order to support the fragile Csyringe and to prevent damage to the syringe. The invention furthermore relates to a method for assembly of the autoinjector device according to the invention.

Claims

1-10. (canceled)

11. A syringe carrier comprising: an elongate body arranged to receive a barrel of a syringe, the syringe comprising a neck having a smaller diameter than the barrel, a needle that extends from the neck, and a rigid needle shield configured to be removably arranged on the needle, wherein, when the rigid needle shield is removably arranged on the needle, a portion of the rigid needle shield covers a portion of the neck, leaving a circumferential gap between the barrel and the rigid needle shield, wherein the elongate body has a partially cylindrical shape with an internal diameter substantially corresponding to an outer diameter of the barrel of the syringe, wherein the elongate body includes a collar at a proximal end of the elongate body and a longitudinal slot formed in the elongate body distally of the collar, wherein a portion of the elongate body defining the longitudinal slot is adapted to flex radially inward over the barrel of the syringe when the syringe is axially inserted through the collar and the portion of the elongate body defining the longitudinal slot, wherein the portion of the elongate body defining the longitudinal slot extends to a distal end of the elongate body, wherein the distal end of the elongate body includes shoulder sections shaped as a portion of a circle arranged in a transverse plane with respect to a longitudinal axis of the syringe carrier, wherein the shoulder sections are adapted to engage in the circumferential gap between a distal end of the barrel and the rigid needle shield.

11. A method comprising: sliding a syringe into a syringe carrier via a wholly circumferential collar at a distal end of an elongate body of the syringe carrier, the syringe comprising a barrel, a neck extending proximally from the barrel, a finger flange extending from a distal end portion of the barrel, a needle extending proximally from the neck, and a rigid needle shield covering the needle, a portion of the elongate body proximal to the collar defining a slot that extends distally from a proximal end of the elongate body such that the proximal end of the elongate body is c-shaped, and at least one projection extending radially inward from the proximal end of the elongate body, the at least one projection having a distally-facing contoured surface and a proximally-facing planar surface, the distally-facing contoured surface configured to accommodate the neck of the syringe, the proximally-facing planar surface configured to abut a distal end of the rigid needle shield of the syringe; and further sliding the syringe proximally such that (i) the rigid needle shield contacts the at least one projection of the proximal end of the elongate body and the proximal end of the elongate body deflects radially outward, and then (ii) a distal end of the rigid needle shield moves proximal to the at least one projection and the proximal end of the elongate body rebounds radially inward such that the at least one projection is disposed in a gap formed between the rigid needle shield and the barrel of the syringe and the at least one projection contacts the barrel of the syringe to restrict proximal axial movement of the syringe relative to the syringe carrier, wherein the rigid needle shield has an outer diameter greater than an inner diameter defined by the at least one projection when the proximal end of the elongate body is in an undeflected position, and the finger flange of the syringe is spaced distally from the syringe carrier when the at least one projection is in contact with the barrel of the syringe, wherein the finger flange of the syringe comprises a first portion that extends radially outward a first distance in a first direction and a second portion that extends radially outward a second distance in a second direction that is perpendicular to the first direction, the first distance being greater than the second distance, and wherein the collar at the distal end of the syringe carrier comprises a first radial protrusion that extends radially outward from the collar and aligns with and is proximally spaced from the first portion of the finger flange when the syringe is inserted in the syringe carrier, a second radial protrusion that extends radially outward from the collar and is opposite the first radial protrusion, and a circumferential region between the first and second radial protrusions that is free of radial protrusions, wherein each of the first and second radial protrusions comprises two ribs that extend parallel to one another, wherein the elongate body defines a recess adjacent the slot, wherein the recess facilitates radial deflection of the elongate body; wherein the elongate body defines a window proximal to the collar, and the elongate body comprises a first projection that extends along an edge of the window.

12. The method of claim 11, wherein the elongate body and the at least one projection are integrally formed with one another.

13. The method of claim 11, wherein the slot extends from the proximal end of the elongate body approximately to the collar.

14. The method of claim 11, wherein the at least one projection is a single projection.

15. The method of claim 11, wherein the outer diameter of the rigid needle shield is substantially equal to an outer diameter of the barrel of the syringe.

16. The method of claim 11, wherein the outer diameter of the rigid needle shield is greater than the inner diameter defined by the at least one projection when the proximal end of the elongate body is rebounded radially inward.

17. The method of claim 11, wherein the syringe contains medicament.

18. The method of claim 11, wherein a proximal surface of the proximal end of the elongate body is c-shaped.

19. The method of claim 11, wherein the window allows visual access to the barrel of the syringe when the syringe is in the syringe carrier.

20. A method comprising: sliding a syringe into a syringe carrier via a wholly circumferential collar at a distal end of an elongate body of the syringe carrier, the syringe comprising a barrel, a neck extending proximally from the barrel, a finger flange extending from distal end portion of the barrel, a needle extending proximally from the neck, and a rigid needle shield covering the needle, a portion of the elongate body proximal to the collar defining a slot that extends distally from a proximal end of the elongate body such that the proximal end of the elongate body is c-shaped and at least one projection extending radially inward from the proximal end of the elongate body, the at least one projection having a distally-facing contoured surface and a proximally-facing planar surface, the distally-facing contoured surface configured to accommodate the neck of the syringe, the proximally-facing planar surface configured to abut a distal end of the rigid needle shield of the syringe; and further sliding the syringe proximally such that (i) the rigid needle shield contacts the at least one projection of the proximal end of the elongate body and the proximal end of the elongate body deflects radially outward, and then (ii) a distal end of the rigid needle shield moves proximal to the at least one projection and the proximal end of the elongate body rebounds radially inward such that the at least one projection is disposed in a gap formed between the rigid needle shield and the barrel of the syringe and the at least one projection contacts the barrel of the syringe to restrict proximal axial movement of the syringe relative to the syringe carrier, wherein the rigid needle shield has an outer diameter greater than an inner diameter defined by the at least one projection when the proximal end of the elongate body is in an undeflected position, and the finger flange of the syringe is spaced proximally from the syringe carrier when the at least one projection is in contact with the barrel of the syringe, wherein the finger flange of the syringe comprises a first portion that extends radially outward a first distance in a first direction and a second portion that extends radially outward a second distance in a second direction that is perpendicular to the first direction, the first distance being greater than the second distance, and wherein the collar at the distal end of the syringe carrier comprises a first radial protrusion that extends radially outward from the collar and aligns with and is proximally spaced from the first portion of the finger flange when the syringe is inserted in the syringe carrier, a second radial protrusion that extends radially outward from the collar and is opposite the first radial protrusion, and a circumferential region between the first and second radial protrusions that is free of radial protrusions, wherein each of the first and second radial protrusions comprises a rib extending in a plane perpendicular to a longitudinal axis of the syringe carrier, wherein the elongate body defines a recess adjacent the slot, wherein the recess facilitates radial deflection of the elongate body; and wherein the elongate body defines a window proximal to the collar, and the elongate body comprises a first projection that extends along an edge of the window.

21. The method of claim 20, wherein the slot extends from the proximal end of the elongate body approximately to the collar.

22. The method of claim 20, wherein the at least one projection is a single projection.

23. The method of claim 20, wherein the outer diameter of the rigid needle shield is substantially equal to an outer diameter of the barrel of the syringe.

24. The method of claim 20, wherein a proximal surface of the proximal end of the elongate body is c-shaped.

25. The method of claim 20, wherein the window allows visual access to the barrel of the syringe when the syringe is in the syringe carrier.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One embodiment of the present invention is illustrated in the appended figures, said figures disclosing:

[0029] FIG. 1 illustrates a perspective view of a syringe assembled in a syringe holder.

[0030] FIG. 2 illustrates a perspective view of a syringe holder.

[0031] FIGS. 3a, 3b and 3c illustrate exploded views of the autoinjector device at different steps during the assembly of the autoinjector device.

DETAILED DESCRIPTION

[0032] In FIGS. 3a to 3c, selected components of an autinjector device 10 according to the invention are illustrated. The autoinjector device 10, elongated along a longitudinal axis A, is intended for self-administration of drugs and has a proximal end 11 and an opposing distal end 12.

[0033] The autoinjector device comprises an autoinjector housing divided into a proximal housing section 13 and distal housing section 14 in order to make the space defined inside the housing accessible for assembly of the different components of the autoinjector.

[0034] The autoinjector housing has the shape of a tube. The autoinjector housing is intended to house a pre-filled syringe 30 within a syringe holder 40. A drive mechanism (not shown) is also arranged within the housing. The drive mechanism is arranged to apply a proximally directed drive force to a movable plunger in the syringe in order to expel the drug through a needle(not shown).

[0035] The drive mechanism is not illustrated in detail in the drawings but different types of drive mechanisms are available. The drive mechanism may comprise a pre-tensioned spring which upon activation applies a pre-determined pressure via plunger rod (not shown) to the movable plunger arranged in a distal end of the syringe.

[0036] The autoinjector is intended for use in combination with a standard pre-filled syringe 30. The syringe 30, assembled in the syringe holder 40 illustrated in perspective in FIG. 2, has a substantially circular cross section having an outer diameter. The syringe is normally made of glass in order to ensure a reliable and hygenic storing of the drug in the syringe 30. At a proximal end of the syringe 30, the outer diameter is reduced and shaped like a neck 32 at which a needle (not shown) and needle shield 34 are attached before delivery of the syringe. In order to ensure that the needle remains sterilized before use, the needle is protected by the needle shield 34 having a substantially circular cross section and having an outer diameter which is larger than the outer diameter of the elongated syringe. The tubular needle shield 34 may be a so-called Rigid Needle Shield (RNS). Further, the tubular needle shield 34 encloses the needle and is removably fastened to the syringe 30 at the neck 32. The distal end of the tube-shaped syringe 30 is arranged with a radially extending flange 35. The syringe 30 furthermore comprises a movable plunger arranged in the distal end of the syringe 30 to seal the syringe 30 and ensure that the pre-filled drug of the syringe remains in the syringe 30. The movable plunger is preferably made of a rubber material in order to achieve a seal between the inner periphery of the syringe 30 and the plunger.

[0037] The syringe 30 is secured in the autoinjector housing by a syringe holder 40 that is described in more detail below. The syringe holder 40 is arranged in the proximal housing section in order to support and maintain the syringe 30 in a pre-determined position in relation to the syringe holder and the autoinjector housing. During assembly of the autoinjector, the syringe 30 is first inserted in the syringe holder 40, which is then moved in the proximal direction of the autoinjector device 10 to a forward position where the syringe holder 40 is secured in the proximal housing section. The movement of the syringe holder in the proximal housing section is facilitated by guiding means 41 consisting of corresponding longitudinal protrutions 42 along the outer periphery of the syringe holder 40 and longitudinal recesses along the inner periphery of the proximal housing section. Furthermore corresponding snap-fitting fastening means 43 are arranged on the syringe holder 40 and the proximal housing section in order to permanently secure the syringe holder in the desired proximal position within the proximal housing section.

[0038] The syringe holder 40 provides a reliable and effective support for the fragile syringe 30 and reduces the risk of damage to the syringe 30. One embodiment of the syringe holder 40 is illustrated in FIG. 2 in a perspective view, where it is separated from the other components of the autoinjector device. The syringe holder 40 has a tubularly shaped holder wall 44 with a proximal end 45 and a distal end 46. The proximal end 45 of the syringe holder is open but provided with a proximal supporting collar 47 arranged around the inner periphery of said syringe holder wall in order to support said syringe neck 32 in the proximal longitudinal direction. Further, the proximal supporting collar 47 has a inner diameter which is lesser than the outer diameter of the elongated syringe and thus also lesser than the outer diameter of the tubular needle shield. A slot 48 extends from said open proximal end in the distal direction resulting in a C-shaped cross sectional shape of the syringe holder wall in the proximal end. The C-shaped holder wall in the proximal end 45 is able to flex radially outward which is essential in order to fit the syringe 30 in the syringe holder 40 since the tubular needle shield 34 has an outer diameter exceeding the inner diameter of the opening in the proximal supporting collar 47. This means that the syringe 30 may be fitted in the syringe holder 40 from the distal end 46 of the syringe holder. The syringe 30 is then moved in the proximal direction within the syringe holder 40. When the tubular needle covering shield 34 reaches the proximal supporting collar 47, the C-shaped holder wall will flex radially outward and thereby make it possible to move the syringe 30 further until the neck 32 of the syringe 30 is in contact with the collar 47, i.e the desired position of the syringe 30 within the syringe holder 40. In this position the needle shield 34 has completely passed the supporting collar 47, allowing the C-shaped holder wall to flex back, radially inward, behind the needle shield, such that the collar supports the syringe at the neck 32.

[0039] The syringe holder 40 furthermore comprises a distal supporting collar 49 arranged around the outer periphery of said syringe holder wall 44 and has a longitudinal length between the proximal supporting collar 47 and a distal supporting collar 49 that corresponds to the length of the syringe 30 so that the distal supporting collar 49 of said syringe holder wall, when the syringe 30 is fitted in the desired position within the syringe holder 40, is in contact with the proximal side of the radially extending flange 35 of the syringe 30 and provides further support for the fragile syringe 30 within the syringe holder 40 at the same time as the proximal supporting collar 47 supports the neck 32 of said syringe 30. Thereby the risk of damage to the syringe 30 is reduced significantly. The syringe holder 40 furthermore comprises guiding means that facilitates its movement in the longitudinal direction of the autoinjector device and locking means for securing the syringe holder in the proximal housing section before assembly of the syringe in the syringe holder 40.

[0040] The proximal housing section is furthermore provided with a window 15, or opening, corresponding to the slot 48 in the syringe holder 40 when the syringe holder 40 is fitted in the intended position in the proximal housing section in order to make the syringe 30, and the drug in the syringe, visible from the outside of the autoinjector housing and possible for the patient to verify that the autoinjector device is correctly assembled and ready for use.

[0041] Three different assembly steps of the autoinjector device are schematically illustrated in FIGS. 3a -3c. In FIG. 3a, the proximal housing section and the syringe holder 40 are illustrated without the syringe 30 fitted in the syringe holder 40. The syringe holder 40 is movably arranged in the proximal housing section between a distal position and a proximal position. Prior to fitting the syringe in the syringe holder the syringe holder is arranged in the distal position ready for assembly.

[0042] The assembly of the autoinjector device 10 is initiated by fitting the syringe 30 in the syringe holder 40 by inserting the proximal end of the syringe in the distal end of the syringe holder 40 and pushing the syringe in the proximal direction until the neck 32 of the syringe 30 is in contact with the collar 47 in the proximal end of the syringe holder40, illustrated in FIG. 3b. The syringe 30 and the syringe holder 40 are then moved simultaneously in the proximal direction to the proximal position in the proximal housing section. In the proximal position, the outer peripery of the proximal end of the syringe holder 40 will be surrounded by support surfaces 16 on the inside surface of the proximal housing section. The cross sectional shape of the support surfaces correspond to the outer periphery of the syringe holder in order to provided a rigid support and prevent the C-shaped wall of the proximal end from flexing radially outwards in order to secure the syringe 30 in the syringe holder 40 and the autoinjector device 10, illustrated in FIG. 3c. Finally, the autoinjector housing is closed around the syringe 30 by fitting the distal housing section to the proximal housing section.

[0043] The assembly method of the present invention accordingly comprises the steps: [0044] a). Inserting the proximal end of the syringe 30 in the distal end of the syringe holder 40; [0045] b). Moving the syringe 30 towards the proximal end of the syringe holder until the neck 32 of the syringe 30 is in contact with the proximal supporting collar 47 and the radially extending flange 35 of the syringe 30 in contact with the distal supporting collar 49 of the syringe holder 40; [0046] c). Moving the syringe holder 40 and the syringe 30 simultaneously towards the proximal end of the autoinjector device 10.

[0047] The different embodiments described above could be combined in different ways and modified further without departing from the scope of the invention that is defined by the claims.