HK1247876B - Drug delivery device with feedback mechanism - Google Patents

Description

Technical Field

The invention relates to a drug delivery device.

Background

Administering an injection is a process which presents a number of risks and challenges for users and healthcare professionals, both mental and physical. Injection devices typically fall into two categories ― manual devices and autoinjectors. In a conventional manual device, manual force is required to drive a medicament through a needle. This is typically done by a plunger which is continuously pressed during the injection. There are numerous disadvantages associated with this approach. For example, if the plunger is released prematurely, the injection will stop and may not deliver an intended dose. Furthermore, the force required to push the plunger may be too high (e.g., if the user is elderly or a child). And, aligning the injection device, administering the injection, and keeping the injection device still during the injection may require dexterity which some patients may not have.

Autoinjector devices aim to make self-injection easier for patients. A conventional autoinjector may provide the force for administering the injection by a spring, and a trigger button or other mechanism may be used to activate the injection. Autoinjectors may be single-use or reusable devices.

Furthermore, it is desirable to administer the full dose in order to achieve full effectiveness of the medicament within the patient.

Thus, there remains a need for an improved drug delivery device.

EP 2 583 705 A1 discloses an auto-injector comprising a syringe carrier arranged to retain a syringe, a plunger arranged to displace a stopper within the syringe, a feedback component retainable in a first position and biased towards a second position, a pin disposed on the feedback component, and an exterior component having a bore. The feedback component moves from the first position to the second position when the plunger during displacement of the stopper reaches a predetermined position. The pin enters the bore when the feedback component is in the second position.

Summary

It is an object of the present invention to provide an improved drug delivery device.

The object is achieved by a drug delivery device according to claim 1.

Exemplary embodiments of the invention are given in the dependent claims.

According to the invention, a drug delivery device comprises:

• a case adapted to enclose a medicament container,
• a plunger disposed within the case and slidable from a proximal position into a distal position for delivering a medicament from the medicament container,
• at least one feedback mechanism activated by movement of the plunger, the feedback mechanism comprising a collar, a control spring biasing the collar in a distal direction, a needle shroud that operatively couples to the collar in a first state, the needle shroud prevented from decoupling the collar by the plunger being in the proximal position, wherein the plunger, during movement from the proximal position towards the distal position, is adapted to allow decoupling of the needle shroud from the collar, to allow a movement of the collar relative to the needle shroud until the collar couples to the needle shroud in a second state.

The drug delivery device is improved due to the feedback mechanism used for indicating to a patient or user that the full dose of medicament was spent.

In an exemplary embodiment the needle shroud axially couples to the collar in the first state and in the second state.

According to the invention, the collar comprises one or more resilient first snap-fit joints adapted to couple to the needle shroud in a ramp engagement in the first state, the first snap-fit joints adapted to inwardly deflect due to this ramp engagement, wherein the plunger in the proximal position is adapted to inwardly support the first snap-fit joints, preventing their inward deflection and wherein the plunger in the distal position is axially removed from the snap-fit joints, allowing their inward deflection.

According to the invention, the collar comprises one or more collar ribs adapted to couple to the needle shroud in the second state.

According to the invention, the needle shroud comprises one or more openings adapted to allow the deflected first snap-fit joints to engage within the openings.

In an exemplary embodiment, the control spring is arranged as a compression spring configured to surround at least part of the collar.

In an exemplary embodiment, the control spring is proximally grounded in the case.

In an exemplary embodiment, the drug delivery device further comprises a plunger release mechanism adapted for preventing release of the plunger when the needle shroud is in a distal position and adapted to release the plunger when the needle shroud is in a proximal position.

In an exemplary embodiment, the plunger release mechanism comprises an angled surface on the case and a rib on the plunger adapted to engage the angled surface so that when a force in the distal direction is applied to the plunger, the rib abuts the angled surface biasing the rib and the plunger in a rotational direction, wherein the collar is adapted to rotationally support the rib, preventing it from moving in the rotational direction when the needle shroud is in the distal position and wherein the collar is adapted to be removed from the rib, allowing it to move in the rotational direction.

In an exemplary embodiment, an inner rib is arranged on the case adapted to rotationally support the collar, preventing it from moving in the rotational direction.

In an exemplary embodiment, the drug delivery device further comprises a shroud lock mechanism adapted to lock the collar in an advanced position.

In an exemplary embodiment, the shroud lock mechanism comprises one or more resilient second snap-fit joints on the collar adapted to engage in a respective opening in the case, wherein the opening comprises an axial extension allowing for some free travel of the snap-fit joints, wherein the second snap-fit joints comprise a respective angled surface adapted to be deflected by ends of the opening for disengaging the opening, wherein a transversal proximal surface on the second snap-fit joint is adapted to proximally abut the case, preventing the collar from moving in the proximal direction.

In an exemplary embodiment, the case comprises a front case and a rear case adapted to be coupled to each other.

In an exemplary embodiment, the front case is part of a control subassembly, which further comprises the needle shroud and a cap, wherein the rear case is part of a drive subassembly, which further comprises the plunger, a drive spring for biasing the plunger in the distal direction, the control spring and the collar.

In an exemplary embodiment, the plunger is hollow and the drive spring is arranged within the plunger.

Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration only, since various changes and modifications of the invention will become apparent to those skilled in the art from this detailed description.

Brief Description of the Drawings

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitive of the present invention, and wherein:

Figure 1

is a perspective view of an exemplary embodiment of an auto-injector,

Figure 2

is a perspective view of a control subassembly,

Figure 3

is a perspective exploded view of the control subassembly,

Figure 4

is a perspective view of a drive subassembly,

Figure 5

is a perspective exploded view of the drive subassembly,

Figure 6

is a schematic exploded view of the auto-injector during assembly,

Figure 7A

is a schematic view of a plunger release mechanism in a pre-assembly or preuse state,

Figure 7B

is a schematic view of the plunger release mechanism in a state during extension of an injection needle,

Figure 7C

is a schematic view of the plunger release mechanism in a state during extension of the injection needle immediately prior to the needle reaching full insertion depth,

Figure 7D

is a schematic view of the plunger release mechanism a state at the beginning of an injection,

Figure 8A

is a schematic view of a feedback mechanism in the pre-assembly state,

Figure 8B

is a schematic view of the feedback mechanism in the pre-use state,

Figure 8C

is a schematic view of the feedback mechanism in a state with the needle at full insertion depth,

Figure 8D

is a schematic view of the feedback mechanism in a state during triggering of a feedback,

Figure 8E

is a schematic view of the feedback mechanism in a state at the end of dose prior to generating the feedback,

Figure 8F

is a schematic view of the feedback mechanism in a state after having generated the feedback,

Figure 9A

is a schematic view of a shroud lock mechanism in a state prior to needle insertion, i.e. in a preassembly state or preuse state,

Figure 9B

is a schematic view of the shroud lock mechanism in a state between the beginning of the injection and the release of the feedback mechanism,

Figure 9C

is a schematic view of the shroud lock mechanism in a state at the end of dose after release of the feedback mechanism,

Figure 9D

is a schematic view of the shroud lock mechanism in a post-use state,

Figure 10

is a perspective longitudinal section of the auto-injector with the cap removed,

Figure 11

is a perspective longitudinal section of the auto-injector with the needle shroud being moved in the proximal direction,

Figure 12

is a perspective longitudinal section of the auto-injector with the needle shroud in a proximal position,

Figure 13

is a perspective longitudinal section of the auto-injector during delivery of the medicament after release of the feedback mechanism,

Figure 14

is a perspective longitudinal section of the auto-injector at the end of dose prior to generation of the audible feedback,

Figure 15

is a perspective longitudinal section of the auto-injector at the end of dose after generation of the audible feedback, and

Figure 16

is a perspective longitudinal section of the auto-injector with the needle shroud extended from the case.

Corresponding parts are marked with the same reference symbols in all figures.

Detailed Description

Figure 1 is a perspective view of an exemplary embodiment of an auto-injector 1. The auto-injector 1 comprises a case 2 comprising a sleeve shaped front case 2.1 and a rear case 2.2. A cap 11 is attached at a distal end of the case 2. A sleeve-shaped needle shroud 7 is telescoped within the case 2. The case 2 is adapted to receive a medicament container 3, such as a syringe 3, for example a glass syringe. The medicament container is referred to hereinafter as the "syringe 3". The syringe 3 may be a pre-filled syringe containing a medicament M and having a needle 4 arranged at a distal end of the syringe 3. In another exemplary embodiment, the medicament container 3 may be a cartridge which includes the medicament M and engages a removable needle (e.g., by threads, snaps, friction, etc.) When the auto-injector 1 or the syringe 3 is assembled, a protective needle sheath 5 is attached to the needle 4. A stopper 6 is arranged for sealing the syringe 3 proximally and for displacing a liquid medicament M contained in the syringe 3 through the hollow needle 4. The syringe 3 is held in the case 2 and supported at its proximal end therein.

The protective needle sheath 5 may be coupled to the cap 11 so that when the cap 11 is removed, the protective needle sheath 5 is also removed from the needle 4. The cap 11 may comprise grip features for facilitating removal of the cap 11.

The sleeve-shaped needle shroud 7 is telescoped in the distal end of the case 2. A control spring 8 is arranged to bias the needle shroud 7 in a distal direction D against the case 2.

A drive spring 9 in the shape of a compression spring is arranged within a proximal part of the case 2. A plunger 10 serves for forwarding the force of the drive spring 9 to the stopper 6. In an exemplary embodiment, the plunger 10 is hollow and the drive spring 9 is arranged within the plunger 10, biasing the plunger 10 in the distal direction D against the rear case 2.2.

The auto-injector 1 may be divided in two subassemblies, a control subassembly 1.1 and a drive subassembly 1.2. This allows for improving flexibility as to the time and location of manufacture of the subassemblies 1.1, 1.2 and final assembly with the syringe 3.

Figure 2 is a perspective view of the control subassembly 1.1. Figure 3 is a perspective exploded view of the control subassembly 1.1. The control subassembly 1.1 comprises all parts and mechanisms which control access to the needle 4 and the forces a user will feel when they use the auto-injector 1. The control subassembly 1.1 comprises the cap 11, the needle shroud 7 and the front case 2.1.

Figure 4 is a perspective view of the drive subassembly 1.2. Figure 5 is a perspective exploded view of the drive subassembly 1.2. The drive subassembly 1.2 comprises the components required to deliver the medicament M. If the viscosity or volume of the medicament M in the syringe 3 is varied, only parts of the drive subassembly 1.2 may need to be changed. The drive subassembly 1.2 comprises the plunger 10, the drive spring 9, the rear case 2.2, the control spring 8 and a sleeve shaped collar 14 which will be explained in more detail below.

Figure 6 is a schematic exploded view of the auto-injector 1 during assembly. In order to assemble the auto-injector 1, a syringe 3 with an attached needle 4 and a protective needle sheath (not illustrated) is inserted into the control subassembly 1.1 in the distal direction D.

Afterwards, the drive subassembly 1.2 is inserted into the control subassembly 1.1 in the distal direction D.

A plunger release mechanism 12 is schematically illustrated in four different states in figures 7A to 7D. The plunger release mechanism 12 is arranged for preventing release of the plunger 10 prior to depression of the needle shroud 7 and for releasing the plunger 10 once the needle shroud 7 is sufficiently depressed.

The plunger release mechanism 12 is adapted to control the automated activation of syringe emptying. The plunger release mechanism 12 is activated immediately prior to full needle insertion. The plunger release mechanism 12 comprises the plunger 10, a longitudinal inner rib 2.3 on the rear case 2.2 and the collar 14. The needle shroud 7, not represented in figures 7A to 7D, is coupled to the collar 14 and adapted to push the collar 14 in a proximal direction P.

The needle shroud 7, the rear case 2.2 and its inner rib 2.3, and the collar 14 are configured to move only in an axial direction, i.e. in the distal direction D and the proximal direction P, whereas the plunger 10 can both move rotationally in rotational directions R1, R2 and axially in the distal direction D and the proximal direction P. In an exemplary embodiment, there may be no compliant part in the plunger release mechanism 12, i.e. the parts may be all rigid and move as a whole with no relative deformation within a part.

Figure 7A shows the plunger release mechanism 12 in a pre-assembly or pre-use state with the plunger 10 in a proximal position P1. The configuration of the plunger release mechanism 12 does not change when transitioning from the pre-assembly state to the pre-use state, i. e. assembling the control sub-assembly 1.1 and the drive sub-assembly 1.2 does not impact the plunger release mechanism 12.

In the pre-assembly or pre-use state, a rib 10.1 on the plunger 10 is slid in an opening 2.4 within the rear case 2.2. The opening 2.4 has an angled surface 2.5 so that when a force in the distal direction D is applied to the plunger 10, e.g. by the drive spring 9, the rib 10.1 abuts the angled surface 2.5 and the plunger 10 attempts to rotate in the rotational direction R1. The rib 10.1 is prevented to move along the angled surface 2.5 of the opening 2.4 by a first collar rib 14.1 on the collar 14. The collar 14 is prevented from rotating in the rotational direction R1 by the inner rib 2.3 on the rear case 2.2.

Figure 7B shows the plunger release mechanism 12 in a state during extension of the injection needle 4. The needle shroud 7 is moved in the proximal direction P into the front case 2.1, e.g. by a user pressing the shroud against an injection site, thereby inserting the needle 4 into the injection site. As the needle shroud 7 is coupled to the collar 14, the collar 14 moves in the proximal direction P as well. The first collar rib 14.1 moves in the proximal direction P accordingly, beginning to clear the way for the rib 10.1 of the plunger 10.

Figure 7C shows the plunger release mechanism 12 in a state during extension of the injection needle 4 immediately prior to the needle 4 reaching full insertion depth. The first collar rib 14.1 has been moved further in the proximal direction P and disengages the rib 10.1 on the plunger 10 so that the plunger 10 is no longer prevented from rotating in the rotational direction R1. The rib 10.1 on the plunger 10 is free to slide along the angled surface 2.5 of the opening 2.4 in the rear case2.2.

Figure 7D shows the plunger release mechanism 12 in a state at the beginning of an injection. The rib 10.1 on the plunger 10 finishes its course along the angled surface 2.5 of the opening 2.4 in the rear case 2.2, thus becoming able to move in the distal direction D without being further rotated. Under the action of the drive spring 9, the plunger 10 pushes on the stopper 6 and starts to empty the content of the syringe 3.

A feedback mechanism 13 is arranged for enabling emission of an audible and/or tactile feedback indicating the completion of medicament delivery. The feedback mechanism 13 is schematically illustrated in six different states in figures 8A to 8F.

The feedback mechanism 13 comprises the plunger 10, the rear case 2.2, the needle shroud 7, the collar 14 and the control spring 8.

Figure 8A shows the feedback mechanism 13 in the pre-assembly state. Only the drive sub-assembly 1.2 is represented in this state. The control spring 8 is compressed between two second collar ribs 14.2 on the collar 14 and a proximal end 2.6 of the rear case 2.2. The plunger 10 is arranged within the collar 14 between inner protrusions 14.4 of first snap-fit joints 14.3 on the collar 14. Consequently, the first snap-fit joints 14.3 cannot deflect inward under the force of the control spring 8 pushing in the distal direction D.

Figure 8B shows the feedback mechanism 13 in the pre-use state. The control subassembly 1.1 is pushed into the drive sub-assembly 1.2. The front case 2.1 and the rear case 2.2 may be coupled by two clips on the front case 2.1 getting caught within openings in the rear case 2.2 (not represented) or vice versa. The needle shroud 7 is inserted and proximal arms 7.1 on the needle shroud 7 axially abut the first snap-fit joints 14.3.

Figure 8C shows the feedback mechanism 13 in a state with the needle 4 at full insertion depth. The needle shroud 7 has been fully moved in the proximal direction P, e.g. by pushing it against an injection site, and has dragged along the collar 14 in the proximal direction P, compressing the control spring 8. As the plunger 10 is arranged within the collar 14 between the inner protrusions 14.4 of the first snap-fit joints 14.3, the first snap-fit joints 14.3 cannot deflect inward under the force of the control spring 8 pushing in the distal direction D.

Figure 8D shows the feedback mechanism 13 in a state when the feedback is triggered near the end of medicament dispense. The plunger 10, approaching the end of its travel with the stopper 6 having nearly bottomed out in the syringe 3, slides down inward angled surfaces 14.5 on the inner protrusions 14.4 allowing for inward deflection of the first snap-fit joints 14.3. Due to a ramp engagement between the first snap-fit joints 14.3 and the proximal ends of the proximal arms 7.1 of the needle shroud 7, the first snap-fit joints 14.3 are inwardly deflected driven by the control spring 8 disengaging them from their axial abutment with the proximal arms 7.1, moving them between the proximal arms 7.1.

Figure 8E shows the feedback mechanism 13 in a state at the end of dose prior to generating the feedback. The plunger 10 at least almost finishes emptying the syringe 3 and is completely removed from between the first snap-fit joints 14.3. In the meantime, the collar 14 has travelled further in the distal direction D along the proximal arms 7.1 and the two first snap-fit joints 14.3 have arrived at respective openings 7.2 in the proximal arms 7.1, allowing the first snap-fit joints 14.3 to relax and straighten back to their initial shape within and engage within the openings 7.2 in the proximal arms 7.1.

Figure 8F shows the feedback mechanism 13 in a state at the end of dose F after having generated the feedback. Due to the relaxed first snap-fit joints 14.3 being engaged within the openings 7.2 whose longitudinal extension allows for some free travel of the first snap-fit joints 14.3, the friction acting against the control spring 8 is reduced and the control spring 8 can now expand and drive the collar 14 in the distal direction D along the proximal arms 7.1 of the needle shroud 7 until two third collar ribs 14.6 on the collar 14 axially hit the proximal arms 7.1 of the needle shroud 7, thus creating an audible and/or tactile feedback which indicates that the dose is complete.

Figures 9A to 9D show schematic views of a shroud lock mechanism 15 in four different states. The shroud lock mechanism 15 is arranged to lock the needle shroud 7 after removal of the auto-injector 1 from an injection site post-use and consequent translation of the needle shroud 7 in the distal direction D relative the case 2.

The shroud lock mechanism 15 comprises the rear case 2.2 and the collar 14.

Figure 9A shows the shroud lock mechanism 15 in a state prior to needle insertion, i.e. in a preassembly state or pre-use state. Two second snap-fit joints 14.7 are arranged on the collar 14 and rest in two openings 2.8 in distal arms 2.9 on the rear case 2.2.

Figure 9B shows the shroud lock mechanism 15 in a state between the beginning of the injection and the release of the feedback mechanism 13 (both states included). The needle shroud 7 and the collar 14 moved in the proximal direction P as the needle shroud 7 was pushed against the injection site. The two second snap-fit joints 14.7 move in the proximal direction P accordingly, travelling up the openings 2.8 whose axial extension allows for some free travel.

Figure 9C shows the shroud lock mechanism 15 in a state at the end of dose after release of the feedback mechanism 13. As the feedback mechanism 13 is released, the collar 14 moves in the distal direction D (cf. fig. 8F). The two second snap-fit joints 14.7 move in the distal direction D accordingly, travelling down the openings 2.8 in the distal arms 2.9 of the rear case 2.2.

Figure 9D shows the shroud lock mechanism 15 in a post-use state. Once the medicament injection is complete, the user pulls the auto-injector 1 away from the injection site and the needle shroud 7 is forced out of the case 2 in the distal direction D by the control spring 8, enveloping the needle 4 and thus acting as a protective shell around it (not represented). The collar 14 is arranged between the needle shroud 7 and the control spring 8. Following the motion of the needle shroud 7, the collar 14 moves in the distal direction D as well. The two second snap-fit joints 14.7 move accordingly and are deflected inward within the rear case 2.2 as angled surfaces 14.8 on the second snap-fit joints 14.7 engage the distal ends of the openings 2.8. As the second snap-fit joints 14.7 travel further beyond the distal ends of the distal arms 2.9 on the rear case 2.2, they are allowed to relax and straighten back outwards to their initial shape. The collar 14 is in an advanced position A and the needle shroud 7, coupled to the collar 14, is in its distal position S1. If it is attempted to push the needle shroud 7 in the proximal direction P again, transversal proximal surfaces 14.9 on the second snap-fit joints 14.7 proximally abut the distal arms 2.9 of the rear case 2.2 preventing further depression of the needle shroud 7 and re-exposure of the needle 4.

A sequence of operation of the auto-injector 1 is as follows: The auto-injector 1 is initially in the state as shown in figure 1. The plunger release mechanism 12 is in the pre-use state as shown in figure 7A. The feedback mechanism 13 is in the pre-use state as illustrated in figure 8B. The shroud lock mechanism 15 is in the pre-use state as illustrated in figure 9A.

The user removes the cap 11 pulling it in the distal direction D away from the case 2. The protective needle sheath 5 may be coupled to the cap 11 so that when the cap 11 is removed, the protective needle sheath 5 is also removed from the needle 4. Figure 10 is a perspective longitudinal section of the auto-injector 1 with the cap 11 removed. The needle shroud 7 is in a distal position S1.

Figure 11 is a perspective longitudinal section of the auto-injector 1 with the needle shroud 7 being moved in the proximal direction P, e.g. by placing it against the injection site and sliding the case 2 forwards. The control spring 8 is held between the collar 14 and the rear case 2.2 and is further compressed when the case 2 moves forwards relative to the needle shroud 7. Except for the needle shroud 7 and the collar 14, all components of the auto-injector 1 move with the case 2. The needle shroud 7 and the collar 14, axially coupled as shown in figure 8B, move in the proximal direction P in comparison to the rest of the parts of the auto-injector 1, thus initiating the plunger release mechanism 12. The plunger release mechanism 12 thus arrives in the state as illustrated in figure 7B. The feedback mechanism 13 transitions from the pre-use state shown in figure 8B to the state as illustrated in figure 8C. The shroud lock mechanism 15 transitions from the pre-use state of figure 9A to the state as illustrated in figure 9B.

Figure 12 is a perspective longitudinal section of the auto-injector 1 with the needle shroud 7 being fully moved in the proximal direction P into a proximal position S2 such that the needle 4 has reached the insertion depth in the injection site. Once the needle shroud 7 is fully depressed, the plunger 10 releases as shown in figure 7D and medicament delivery begins. The drive spring 9 begins to expand, pushing the plunger 10 in the distal direction D to inject the medicament M. The feedback mechanism 13 is in the state as illustrated in figure 8C. The shroud lock mechanism 15 is in the state as illustrated in figure 9B.

Figure 13 is a perspective longitudinal section of the auto-injector 1 during delivery of the medicament M after release of the feedback mechanism 13. As the delivery of the medicament M progresses with the plunger 10 moving down the syringe 3 barrel, the feedback mechanism 13 activates. Up to this point, the collar 14 was resting on the needle shroud 7, the needle shroud 7 preventing the collar 14 from moving further in the distal direction D. Prior to the end of the dose, the plunger 10 clears the inside of the collar 14, leaving the two first snap-fit joints 14.3 free to deflect inward. Under the force of the control spring 8, the collar 14 moves in the distal direction D, forcing its way in between the proximal arms 7.1 on the needle shroud 7. The two first snap fit joints 14.3 are deflected inward within the needle shroud 7. The feedback mechanism 13 arrives in the state as illustrated in figure 8D. The shroud lock mechanism 15 is in the state as illustrated in figure 9B.

Figure 14 is a perspective longitudinal section of the auto-injector 1 at the end of dose prior to generation of the audible feedback. The plunger 10 has fully advanced the stopper 6 within the syringe 3 barrel and arrived at a distal position P2. Pursuing its course, the collar 14 brings the two first snap-fit joints 14.3 down to the opening 7.2 in the needle shroud 7, where the first snap-fit joints 14.3 straighten back to their initial shape. The feedback mechanism 13 arrives in the state as illustrated in figure 8E.

Figure 15 is a perspective longitudinal section of the auto-injector 1 at the end of dose after generation of the audible feedback. The injection is complete and an audible and/or tactile feedback is emitted through the collar 14 hitting the needle shroud 7 as the feedback mechanism 13 operates. With reduced friction, the collar 14 is propelled by the control spring 8 and the two third collar ribs 14.6 hit the needle shroud 7, creating the noise indicating that the dose is complete. The feedback mechanism 13 arrives in the state as illustrated in Figure 8F. The shroud lock mechanism 15 is in the state as illustrated in Figure 9C.

Figure 16 is a perspective longitudinal section of the auto-injector 1 post-use with the needle shroud 7 extended from the case 2. As the auto-injector 1 is moved away from the injection site, the needle shroud 7 and the collar 14, which are axially coupled as shown in figure 8F, advance, driven by the control spring 8. The needle shroud 7 returns to its pre-use position. However, the position of the collar 14 has evolved since the pre-use state. The two second snap-fit joints 14.7, which were so far travelling within the opening 2.8 in the rear case 2.2, move further in the distal direction D and take position just beneath the distal arms 2.9 of the rear case 2.2. This suppresses the axial degree of freedom of the collar 14 and the needle shroud 7, which are both still axially coupled. The collar 14 is locked and prevents any further axial motion of the needle shroud 7, rendering the auto-injector 1 needle safe in its post-use state. The shroud lock mechanism 15 is in the state as illustrated in Figure 9D.

The case 2 may comprise a viewing window (not illustrated) allowing the user to examine the medicament M for clarity, observe the advancing plunger 10 for allowing to estimate the progress of the medicament delivery, and helping the user differentiate between a used and an un-used auto-injector 1.

In an exemplary embodiment, a tamper strip may be arranged between the cap 11 and the front case 2.1 when the control subassembly 1.1 is assembled.

The auto-injector 1 may be placed against the injection site multiple times without any adverse effect to the mechanism. The force to depress the needle shroud 7 may be less than 6 N.

The syringe 3 used in the auto-injector 1 may for example be a 1 ml syringe 3.

The auto-injector 1 is always needle safe as the needle can be retracted before the delivery of the medicament M is complete.

As only the plunger 10 and the rear case 2.2 are subjected to the relatively high force of the drive spring 9, the other components of the auto-injector 1 are not affected, so reliability and shelf life are increased.

The auto-injector 1 is suited to be used as a platform as the drive spring 9 can be swapped to deliver different viscosity drugs without affecting the insertion or retraction functions. This is particularly advantageous for high viscosity fluids.

The terms "drug" or "medicament" are used herein to describe one or more pharmaceutically active compounds. As described below, a drug or medicament can include at least one small or large molecule, or combinations thereof, in various types of formulations, for the treatment of one or more diseases. Exemplary pharmaceutically active compounds may include small molecules; polypeptides, peptides and proteins (e.g., hormones, growth factors, antibodies, antibody fragments, and enzymes); carbohydrates and polysaccharides; and nucleic acids, double or single stranded DNA (including naked and cDNA), RNA, antisense nucleic acids such as antisense DNA and RNA, small interfering RNA (siRNA), ribozymes, genes, and oligonucleotides. Nucleic acids may be incorporated into molecular delivery systems such as vectors, plasmids, or liposomes. Mixtures of one or more of these drugs are also contemplated.

The term "drug delivery device" shall encompass any type of device or system configured to dispense a drug into a human or animal body. Without limitation, a drug delivery device may be an injection device (e.g., syringe, pen injector, auto injector, large-volume device, pump, perfusion system, or other device configured for intraocular, subcutaneous, intramuscular, or intravascular delivery), skin patch (e.g., osmotic, chemical, micro-needle), inhaler (e.g., nasal or pulmonary), implantable (e.g., coated stent, capsule), or feeding systems for the gastrointestinal tract. The presently described drugs may be particularly useful with injection devices that include a needle, e.g., a small gauge needle.

The drug or medicament may be contained in a primary package or "drug container" adapted for use with a drug delivery device. The drug container may be, e.g., a cartridge, syringe, reservoir, or other vessel configured to provide a suitable chamber for storage (e.g., short- or long-term storage) of one or more pharmaceutically active compounds. For example, in some instances, the chamber may be designed to store a drug for at least one day (e.g., 1 to at least 30 days). In some instances, the chamber may be designed to store a drug for about 1 month to about 2 years. Storage may occur at room temperature (e.g., about 20°C), or refrigerated temperatures (e.g., from about - 4°C to about 4°C). In some instances, the drug container may be or may include a dual-chamber cartridge configured to store two or more components of a drug formulation (e.g., a drug and a diluent, or two different types of drugs) separately, one in each chamber. In such instances, the two chambers of the dual-chamber cartridge may be configured to allow mixing between the two or more components of the drug or medicament prior to and/or during dispensing into the human or animal body. For example, the two chambers may be configured such that they are in fluid communication with each other (e.g., by way of a conduit between the two chambers) and allow mixing of the two components when desired by a user prior to dispensing. Alternatively or in addition, the two chambers may be configured to allow mixing as the components are being dispensed into the human or animal body.

The drug delivery devices and drugs described herein can be used for the treatment and/or prophylaxis of many different types of disorders. Exemplary disorders include, e.g., diabetes mellitus or complications associated with diabetes mellitus such as diabetic retinopathy, thromboembolism disorders such as deep vein or pulmonary thromboembolism. Further exemplary disorders are acute coronary syndrome (ACS), angina, myocardial infarction, cancer, macular degeneration, inflammation, hay fever, atherosclerosis and/or rheumatoid arthritis.

Exemplary drugs for the treatment and/or prophylaxis of diabetes mellitus or complications associated with diabetes mellitus include an insulin, e.g., human insulin, or a human insulin analogue or derivative, a glucagon-like peptide (GLP-1), GLP-1 analogues or GLP-1 receptor agonists, or an analogue or derivative thereof, a dipeptidyl peptidase-4 (DPP4) inhibitor, or a pharmaceutically acceptable salt or solvate thereof, or any mixture thereof. As used herein, the term "derivative" refers to any substance which is sufficiently structurally similar to the original substance so as to have substantially similar functionality or activity (e.g., therapeutic effectiveness).

Exemplary insulin analogues are Gly(A21), Arg(B31), Arg(B32) human insulin (insulin glargine); Lys(B3), Glu(B29) human insulin; Lys(B28), Pro(B29) human insulin; Asp(B28) human insulin; human insulin, wherein proline in position B28 is replaced by Asp, Lys, Leu, Val or Ala and wherein in position B29 Lys may be replaced by Pro; Ala(B26) human insulin; Des(B28-B30) human insulin; Des(B27) human insulin and Des(B30) human insulin.

Exemplary insulin derivatives are, for example, B29-N-myristoyl-des(B30) human insulin; B29-N-palmitoyl-des(B30) human insulin; B29-N-myristoyl human insulin; B29-N-palmitoyl human insulin; B28-N-myristoyl LysB28ProB29 human insulin; B28-N-palmitoyl-LysB28ProB29 human insulin; B30-N-myristoyl-ThrB29LysB30 human insulin; B30-N-palmitoyl- ThrB29LysB30 human insulin; B29-N-(N-palmitoyl-gamma-glutamyl)-des(B30) human insulin; B29-N-(N-lithocholyl-gamma-glutamyl)-des(B30) human insulin; B29-N-(ω-carboxyheptadecanoyl)-des(B30) human insulin and B29-N-(ω-carboxyheptadecanoyl) human insulin. Exemplary GLP-1, GLP-1 analogues and GLP-1 receptor agonists are, for example: Lixisenatide / AVE0010 / ZP10 / Lyxumia, Exenatide / Exendin-4 / Byetta / Bydureon / ITCA 650 / AC-2993 (a 39 amino acid peptide which is produced by the salivary glands of the Gila monster), Liraglutide / Victoza, Semaglutide, Taspoglutide, Syncria / Albiglutide, Dulaglutide, rExendin-4, CJC-1134-PC, PB-1023, TTP-054, Langlenatide / HM-11260C, CM-3, GLP-1 Eligen, ORMD-0901, NN-9924, NN-9926, NN-9927, Nodexen, Viador-GLP-1, CVX-096, ZYOG-1, ZYD-1, GSK-2374697, DA-3091, MAR-701, MAR709, ZP-2929, ZP-3022, TT-401, BHM-034. MOD-6030, CAM-2036, DA-15864, ARI-2651, ARI-2255, Exenatide-XTEN and Glucagon-Xten.

An exemplary oligonucleotide is, for example: mipomersen / Kynamro, a cholesterol-reducing antisense therapeutic for the treatment of familial hypercholesterolemia.

Exemplary DPP4 inhibitors are Vildagliptin, Sitagliptin, Denagliptin, Saxagliptin, Berberine.

Exemplary hormones include hypophysis hormones or hypothalamus hormones or regulatory active peptides and their antagonists, such as Gonadotropine (Follitropin, Lutropin, Choriongonadotropin, Menotropin), Somatropine (Somatropin), Desmopressin, Terlipressin, Gonadorelin, Triptorelin, Leuprorelin, Buserelin, Nafarelin, and Goserelin.

Exemplary polysaccharides include a glucosaminoglycane, a hyaluronic acid, a heparin, a low molecular weight heparin or an ultra-low molecular weight heparin or a derivative thereof, or a sulphated polysaccharide, e.g. a poly-sulphated form of the above-mentioned polysaccharides, and/or a pharmaceutically acceptable salt thereof. An example of a pharmaceutically acceptable salt of a poly-sulphated low molecular weight heparin is enoxaparin sodium. An example of a hyaluronic acid derivative is Hylan G-F 20 / Synvisc, a sodium hyaluronate.

The term "antibody", as used herein, refers to an immunoglobulin molecule or an antigen-binding portion thereof. Examples of antigen-binding portions of immunoglobulin molecules include F(ab) and F(ab')₂ fragments, which retain the ability to bind antigen. The antibody can be polyclonal, monoclonal, recombinant, chimeric, de-immunized or humanized, fully human, non-human, (e.g., murine), or single chain antibody. In some embodiments, the antibody has effector function and can fix complement. In some embodiments, the antibody has reduced or no ability to bind an Fc receptor. For example, the antibody can be an isotype or subtype, an antibody fragment or mutant, which does not support binding to an Fc receptor, e.g., it has a mutagenized or deleted Fc receptor binding region.

The terms "fragment" or "antibody fragment" refer to a polypeptide derived from an antibody polypeptide molecule (e.g., an antibody heavy and/or light chain polypeptide) that does not comprise a full-length antibody polypeptide, but that still comprises at least a portion of a full-length antibody polypeptide that is capable of binding to an antigen. Antibody fragments can comprise a cleaved portion of a full length antibody polypeptide, although the term is not limited to such cleaved fragments. Antibody fragments that are useful in the present invention include, for example, Fab fragments, F(ab')2 fragments, scFv (single-chain Fv) fragments, linear antibodies, monospecific or multispecific antibody fragments such as bispecific, trispecific, and multispecific antibodies (e.g., diabodies, triabodies, tetrabodies), minibodies, chelating recombinant antibodies, tribodies or bibodies, intrabodies, nanobodies, small modular immunopharmaceuticals (SMIP), binding-domain immunoglobulin fusion proteins, camelized antibodies, and VHH containing antibodies. Additional examples of antigen-binding antibody fragments are known in the art.

The terms "Complementarity-determining region" or "CDR" refer to short polypeptide sequences within the variable region of both heavy and light chain polypeptides that are primarily responsible for mediating specific antigen recognition. The term "framework region" refers to amino acid sequences within the variable region of both heavy and light chain polypeptides that are not CDR sequences, and are primarily responsible for maintaining correct positioning of the CDR sequences to permit antigen binding. Although the framework regions themselves typically do not directly participate in antigen binding, as is known in the art, certain residues within the framework regions of certain antibodies can directly participate in antigen binding or can affect the ability of one or more amino acids in CDRs to interact with antigen.

Exemplary antibodies are anti PCSK-9 mAb (e.g., Alirocumab), anti IL-6 mAb (e.g., Sarilumab), and anti IL-4 mAb (e.g., Dupilumab).

The compounds described herein may be used in pharmaceutical formulations comprising (a) the compound(s) or pharmaceutically acceptable salts thereof, and (b) a pharmaceutically acceptable carrier. The compounds may also be used in pharmaceutical formulations that include one or more other active pharmaceutical ingredients or in pharmaceutical formulations in which the present compound or a pharmaceutically acceptable salt thereof is the only active ingredient. Accordingly, the pharmaceutical formulations of the present disclosure encompass any formulation made by admixing a compound described herein and a pharmaceutically acceptable carrier.

Pharmaceutically acceptable salts of any drug described herein are also contemplated for use in drug delivery devices. Pharmaceutically acceptable salts are for example acid addition salts and basic salts. Acid addition salts are e.g. HCI or HBr salts. Basic salts are e.g. salts having a cation selected from an alkali or alkaline earth metal, e.g. Na+, or K+, or Ca2+, or an ammonium ion N+(R1)(R2)(R3)(R4), wherein R1 to R4 independently of each other mean: hydrogen, an optionally substituted C1-C6-alkyl group, an optionally substituted C2-C6-alkenyl group, an optionally substituted C6-C10-aryl group, or an optionally substituted C6-C10-heteroaryl group. Further examples of pharmaceutically acceptable salts are known to those of skill in the arts.

Pharmaceutically acceptable solvates are for example hydrates or alkanolates such as methanolates or ethanolates.

Those of skill in the art will understand that modifications (additions and/or removals) of various components of the substances, formulations, apparatuses, methods, systems and embodiments described herein may be made.

List of References

1

auto-injector

1.1

control subassembly

1.2

drive subassembly

2

case

2.1

front case

2.2

rear case

2.3

inner rib

2.4

opening

2.5

angled surface

2.6

proximal end

2.8

opening

2.9

distal arm

3

syringe

4

injection needle

5

protective needle sheath

6

stopper

7

needle shroud

7.1

proximal arm

7.2

opening

8

control spring

9

drive spring

10

plunger

10.1

rib

11

cap

12

plunger release mechanism

13

feedback mechanism

14

collar

14.1

first collar rib

14.2

second collar rib

14.3

first snap-fit joint

14.4

inner protrusion

14.5

angled surface

14.6

third collar rib

14.7

second snap-fit joint

14.8

angled surface

14.9

proximal surface

15

shroud lock mechanism

A

advanced position

D

distal direction

M

medicament

P

proximal direction

P1

proximal position

P2

distal position

R1

rotational direction

R2

rotational direction

S1

distal position

S2

proximal position

Claims (10)

1. Drug delivery device (1) comprising:

   - a case (2) adapted to enclose a medicament container (3),

   - a plunger (10) disposed within the case (2) and slidable from a proximal position (P1) into a distal position (P2) for delivering a medicament (M) from the medicament container (3),

   - at least one feedback mechanism (13) activated by movement of the plunger (10), the feedback mechanism (13) comprising a collar (14), a control spring (8) biasing the collar (14) in a distal direction (D), and a shroud characterized in that the shroud is a needle shroud (7) adapted to operatively couple to the collar (14) in a first state, wherein in said first state, the needle shroud (7) is prevented from decoupling the collar (14) by the plunger (10) being in the proximal position (P1), wherein the plunger (10), during movement from the proximal position (P1) towards the distal position (P2), is adapted to allow decoupling of the needle shroud (7) from the collar (14), to allow a movement of the collar (14) relative to the needle shroud (7) until the collar (14) couples to the needle shroud (7) in a second state,

   wherein the collar (14) comprises one or more resilient first snap-fit joints (14.3) adapted to axially couple to the needle shroud (7) in a ramp engagement in the first state, the first snap-fit joints (14.3) adapted to inwardly deflect due to this ramp engagement, wherein the plunger (10) in the proximal position (P1) is adapted to inwardly support the first snap-fit joints (14.3), preventing their inward deflection and wherein the plunger (10) in the distal position (P2) is axially removed from the snap-fit joints (14.3), allowing their inward deflection,

   wherein the collar (14) comprises one or more collar ribs (14.6) adapted to axially couple to the needle shroud (7) in the second state, and wherein the needle shroud (7) comprises one or more openings (7.2) adapted to allow the deflected first snap-fit joints (14.3) to engage within the openings (7.2).
2. Drug delivery device (1) according to claim 1, wherein the control spring (8) is arranged as a compression spring configured to surround at least part of the collar (14).
3. Drug delivery device (1) according to any one of the preceding claims, further comprising a plunger release mechanism (12) adapted for preventing release of the plunger (10) when the needle shroud (7) is in a distal position (S1) and adapted to release the plunger (10) when the needle shroud (7) is in a proximal position (S2).
4. Drug delivery device (1) according to claim 3, wherein the plunger release mechanism (12) comprises an angled surface (2.5) on the case (2) and a rib (10.1) on the plunger (10) adapted to engage the angled surface (2.5) so that when a force in the distal direction (D) is applied to the plunger (10), the rib (10.1) abuts the angled surface (2.5) biasing the rib (10.1) and the plunger (10) in a rotational direction (R1), wherein the collar (14) is adapted to rotationally support the rib (10.1), preventing it from moving in the rotational direction (R1) when the needle shroud (7) is in the distal position (S1) and wherein the collar (14) is adapted to be removed from the rib (10.1), allowing it to move in the rotational direction (R1).
5. Drug delivery device (1) according to claim 4, wherein an inner rib (2.3) is arranged on the case (2) adapted to rotationally support the collar (14), preventing it from moving in the rotational direction (R1).
6. Drug delivery device (1) according to any one of the preceding claims, further comprising a shroud lock mechanism (15) adapted to lock the collar (14) in an advanced position (A).
7. Drug delivery device (1) according to claim 6, wherein the shroud lock mechanism (15) comprises one or more resilient second snap-fit joints (14.7) on the collar (14) adapted to engage in a respective opening (2.8) in the case (2), wherein the opening (2.8) comprises an axial extension allowing for some free travel of the snap-fit joints (14.7), wherein the second snap-fit joints (14.7) comprise a respective angled surface (14.8) adapted to be deflected by ends of the opening (2.8) for disengaging the opening (2.8), wherein a transversal proximal surface (14.9) on the second snap-fit joint (14.7) is adapted to proximally abut the case (2), preventing the collar (14) from moving in the proximal direction (P).
8. Drug delivery device (1) according to any one of the preceding claims, wherein the case (2) comprises a front case (2.1) and a rear case (2.2) adapted to be coupled to each other.
9. Drug delivery device (1) according to claim 8, wherein the front case (2.1) is part of a control subassembly (1.1), which further comprises the needle shroud (7) and a cap (11), wherein the rear case (2.2) is part of a drive subassembly (1.2), which further comprises the plunger (10), a drive spring (9) for biasing the plunger (10) in the distal direction (D), the control spring (8) and the collar (14).
10. Drug delivery device (1) according to claim 9, wherein the plunger (10) is hollow and the drive spring (9) is arranged within the plunger (10).