Auto-injection device

Abstract

The present invention relates to an autoinjector device (10) for use in combination with a syringe (30), said syringe 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 syringe 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. An auto-injector device, elongated along a longitudinal axis and having a proximal end and an opposing distal end, the device comprising a syringe having a substantially circular cross section with an outer diameter, a proximal end, a neck, a distal end with a flange radially extending from an outer periphery of a container, a movable plunger, a needle, and a tubular needle shield having an outer diameter that is larger than the outer diameter of the syringe; an elongated auto-injector housing, comprising a space for the syringe; and a syringe holder having a syringe holder wall with a substantially tubular shape, the syringe holder wall having: an open distal end with a distal supporting collar arranged around an outer periphery of the syringe holder wall to support the syringe by the flange, an open proximal end with a proximal supporting collar arranged around an inner periphery of the syringe holder wall to support the syringe neck, wherein the proximal supporting collar is configured to flex radially outward to allow the tubular needle shield to pass through when the syringe is longitudinally mounted in the syringe holder, and a slot extending from the open proximal end in a distal direction, resulting in a C-shaped cross sectional shape of the syringe holder wall in the proximal end; wherein the outer periphery of the proximal end of the syringe holder is radially supported by at least one contact surface of the auto-injector housing when the syringe holder is in a proximal and secured position within the auto-injector housing, and wherein the auto-injector housing prevents the proximal supporting collar from flexing radially outward when the syringe holder is in the proximal and secured position within the auto-injector housing, thereby restraining the syringe within the syringe holder.

2. The auto-injector device of claim 1, wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the syringe.

3. The auto-injector device of claim 1, wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the tubular needle shield.

4. The auto-injector device of claim 1, wherein the syringe holder wall has a longitudinal length between the proximal supporting collar and the distal supporting collar corresponding to a length of the syringe such that the distal supporting collar supports the flange and the proximal supporting collar supports the neck simultaneously when a force is applied to the movable plunger.

5. The auto-injector device of claim 4, wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the syringe.

6. The auto-injector device of claim 4, wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the tubular needle shield.

7. The auto-injector device of claim 1, wherein the syringe holder further comprises at least one protrusion to control movement of the syringe holder within the housing when the syringe holder is longitudinally mounted in the housing.

8. The auto-injector device of claim 7, wherein the at least one protrusion comprises a number of protrusions along the outer periphery of the syringe holder wall, and wherein the auto-injector housing comprises a number of corresponding grooves along the inner periphery of the housing.

9. The auto-injector device of claim 1, comprising a number of corresponding openings on the housing and on the syringe holder.

10. The auto-injector device of claim 1, wherein the syringe holder comprises a fastener for securing the syringe holder in relation to the housing when the syringe holder is longitudinally mounted in the housing.

11. The auto-injector device of claim 1, wherein the syringe holder is movably arranged in a proximal section of the housing between a distal position, in which the syringe may be inserted through the open distal end, and the proximal position.

12. A method of assembling a syringe in an auto-injector device according to claim 1, comprising: a) inserting the proximal end of the syringe in the distal end of the syringe holder; b) moving the syringe toward the proximal end of the syringe holder until the neck is in contact with the proximal supporting collar and the flange is in contact with the distal supporting collar of the syringe holder; and c) moving the syringe holder and the syringe toward the proximal end of the auto-injector device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) One embodiment of the present invention is illustrated in the appended figures, said figures disclosing:

(2) FIG. 1 illustrates a perspective view of a syringe assembled in a syringe holder.

(3) FIG. 2 illustrates a perspective view of a syringe holder.

(4) FIGS. 3a, 3b and 3c illustrate exploded views of the autoinjector device at different steps during the assembly of the autoinjector device.

DETAILED DESCRIPTION

(5) In FIGS. 3a to 3c, selected components of an autoinjector 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.

(6) 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.

(7) 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).

(8) 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.

(9) 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.

(10) 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 protrusions 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.

(11) 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.

(12) 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.

(13) 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.

(14) 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.

(15) 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 holder 40, 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 periphery 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.

(16) The assembly method of the present invention accordingly comprises the steps: a). Inserting the proximal end of the syringe 30 in the distal end of the syringe holder 40; 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; c). Moving the syringe holder 40 and the syringe 30 simultaneously towards the proximal end of the autoinjector device 10.

(17) 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.