DOSE SETTING DEVICE FOR AN INJECTION DEVICE

Abstract

A dosing device for an injection device, the dosing device including an actuating element for adjusting and/or dispensing a dose from the injection device, a thrust element for generating a forward movement for discharging a dose and a coupling to which the actuating element and the thrust element are coupled such that a rotational movement of the actuating element is transmitted directly to the thrust element and an axial movement of the actuating element is different than an axial movement of the thrust element.

Claims

1. An injection device with an ampoule containing a substance and a dose setting device, said dose setting device comprising: a restrictor element for restricting a maximum total dose of substance which can be set and dispensed from the ampoule; and an operating element for setting a dose which is operatively coupled with the restrictor element so that the restrictor element moves during a dose setting movement of the operating element from an initial position inside the dose setting device toward a stop in order to block the movement of the restrictor element, thereby blocking the movement of the operating element in a dose setting direction and restricting the maximum total dose set; wherein the restrictor element is coupled with the operating element so that the restrictor element moves relative to the dose setting device back to the initial position as the set dose is being dispensed.

2. The injection device according to claim 1 further comprising a drive element which is configured to push on a stopper of the ampoule for dispensing substance from the injection device.

3. The injection device according to claim 2 wherein the drive element is a threaded rod.

4. The injection device according to claim 3 wherein the restrictor element is guided in a thread of the threaded rod.

5. The injection device according to claim 4 wherein the stop is an end of a thread of the threaded rod, and/or an axial stop and/or a radial stop on the threaded rod.

6. The injection device according to claim 5 wherein the threaded rod is guided in an internal thread of the dose setting device.

7. The injection device according to claim 6 wherein the threaded rod is guided in a unidirectional rotation locking element.

8. The injection device according to claim 7 further comprising a housing with an insert wherein the operating element is in threaded engagement with the insert and may be screwed out of the injection device in the proximal direction to set a dose and rotated back to dispense the dose.

9. The injection device according to claim 8 wherein the operating element is a dose setting element and wherein the restrictor element is slidable in the dose setting element and rotationally locked to the dose setting element.

10. The injection device according to claim 8 wherein the restrictor element is moved toward the stop during dose setting and is moved back to its initial position when the set dose has been dispensed in a pendulum movement.

11. The injection device according to claim 10 wherein the restrictor element moves in the same direction as the threaded rod during dispensing of a dose.

12. The injection device according to claim 11 wherein the restrictor element moves in the direction toward the stop only while the dose is being set, whereby the distance or gap between the stop and the restrictor element becomes shorter every time a dose is dispensed.

13. The injection device according to claim 12 wherein the thread pitch of the thread of the dose setting element engaging the insert is greater than the thread pitch of the threaded rod engaging the dose setting device such that a step down in ratio can be obtained during a dispensing operation.

14. A dose setting device for an injection device comprising: a restrictor element for restricting a maximum total dose of substance which can be set with the injection device; and an operating element for setting a dose which is coupled with the restrictor element so that the restrictor element moves during a dose setting movement of the operating element from an initial position inside the dose setting device toward a stop in order to block the movement of the restrictor element thereby blocking the movement of the operating element in a dose setting direction and restricting the maximum total dose set; wherein the restrictor element is coupled with the operating element so that the restrictor element moves relative to the dose setting device back to the initial position as the set dose is being dispensed.

15. The dose setting device according to claim 14 further comprising a threaded rod which is configured to advance when the set dose is being dispensed.

16. The dose setting device according to claim 15 wherein the restrictor element is guided in a thread of the threaded rod and wherein the stop is an end of a thread of the threaded rod, and/or an axial stop and/or a radial stop on the threaded rod.

17. The dose setting device according to claim 16 furthermore comprising a housing with an insert wherein the operating element is in threaded engagement with the insert and may be screwed out of the injection device in the proximal direction to set a dose and rotated back to dispense the dose.

18. The dose setting device according to claim 17 wherein the operating element is a dose setting element and wherein the restrictor element is slidable in the dose setting element and rotationally locked to the dose setting element.

19. The dose setting device according to claim 17 wherein the restrictor element is moved toward the stop during dose setting and is moved back to its initial position when the set dose has been dispensed in a pendulum movement and wherein the restrictor element moves in the same direction as the threaded rod or plunger rod during dispensing of a dose.

20. The dose setting device according to claim 19 wherein the restrictor element moves in the direction toward the stop only while the dose is being set whereby the distance or gap between the stop and the restrictor element becomes shorter every time a dose is dispensed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG. 1 is a cross-section of one embodiment of an injection device in accordance with the present application;

[0028] FIG. 2 is a detail of the dose setting and dispensing mechanism illustrated in FIG. 1;

[0029] FIG. 3A and FIG. 3B are exploded diagrams of the injection device illustrated in FIG. 1;

[0030] FIG. 4A depicts an isometric view of a first end of a housing of the injection device;

[0031] FIG. 4B depicts an isometric view of a second end of the housing of FIG. 4A, the second end being opposite the first end;

[0032] FIG. 4C depicts a cross-section of the housing of FIG. 4A;

[0033] FIG. 4D depicts a first end view of the housing of FIG. 4A;

[0034] FIG. 5A illustrates an isometric view of a first end of a threaded sleeve of the injection device;

[0035] FIG. 5B illustrates an isometric view of a second end of the threaded sleeve of FIG. 5A rotated along the longitudinal axis by 180° ;

[0036] FIG. 5C illustrates a cross-section of the threaded sleeve of FIG. 5A;

[0037] FIG. 6A illustrates an isometric view of a first end of a dose setting sleeve of the injection device;

[0038] FIG. 6B illustrates an isometric view of a second end of the dose setting sleeve of FIG. 5A, the second end being opposite the first end;

[0039] FIG. 6C illustrates a cross-section of the dose setting sleeve of FIG. 6A;

[0040] FIG. 7A illustrates an isometric view of a first end of a coupling element of the injection device;

[0041] FIG. 7B illustrates an isometric view of a second end of the coupling element of FIG. 7A, the second end being opposite the first end;

[0042] FIG. 7C illustrates a cross-section of the coupling element of FIG. 7A;

[0043] FIG. 8A illustrates an isometric view of a first end of a dose setting knob of the injection device;

[0044] FIG. 8B illustrates an isometric view of a second end of the dose setting knob of FIG. 8A, the second end being opposite the first end;

[0045] FIG. 8C illustrates a cross-section of the dose setting knob of FIG. 8A;

[0046] FIG. 9A illustrates an isometric view of a first end of a threaded rod of the injection device;

[0047] FIG. 9B illustrates an isometric view of a second end of the threaded rod of FIG. 9A, the second end being opposite the first end;

[0048] FIG. 9C is a cross-section of the threaded rod of FIG. 9A;

[0049] FIG. 10A illustrates an isometric view of a first end of a restrictor sleeve or restrictor nut of the injection device;

[0050] FIG. 10B illustrates an isometric view of a second end of the restrictor sleeve or restrictor nut of FIG. 10A;

[0051] FIG. 10C illustrates a cross-section of the restrictor sleeve or restrictor nut of FIG. 10A;

[0052] FIG. 11A illustrates an isometric view of a first end of a counter-rotation lock of the injection device;

[0053] FIG. 11B illustrates an isometric view of a second end of the counter-rotation lock of FIG. 11A, the second end being opposite the first end;

[0054] FIG. 11C illustrates a view of the first end of the counter-rotation lock of FIG. 11A;

[0055] FIG. 12A illustrates an isometric view of a first end of a carpoule or ampoule sleeve of the injection device;

[0056] FIG. 12B illustrates another isometric view of the carpoule or ampoule sleeve of FIG. 12A;

[0057] FIG. 12C illustrates a cross-section of the carpoule or ampoule sleeve of FIG. 12A;

[0058] FIG. 13A illustrates an isometric view of a first end of a protective cap of the injection device;

[0059] FIG. 13B illustrates an isometric view of a second end of the protective cap of FIG. 13A;

[0060] FIG. 13C illustrates a cross-section of the protective cap of FIG. 13A;

[0061] FIG. 14A is a sectional view illustrating another embodiment of an injection device in accordance with the present application in an as-sold state;

[0062] FIG. 14B shows the injection device illustrated in FIG. 14A in a primed state after dispensing a dose;

[0063] FIG. 14C illustrates a coupling between a setting element and restrictor element;

[0064] FIG. 14D illustrates how a threaded rod is guided in a coupling element;

[0065] FIG. 14E is a perspective view of the setting or operating element;

[0066] FIG. 14F illustrates how a counter-rotation lock is coupled with the pendulum restrictor.

DETAILED DESCRIPTION

[0067] With regard to fastening, mounting, attaching or connecting components of the present invention, unless specifically described as otherwise, conventional mechanical fasteners and methods may be used. Other appropriate fastening or attachment methods include adhesives, welding and soldering, the latter particularly with regard to the electrical system of the invention, if any. In embodiments with electrical features or components, suitable electrical components and circuitry, wires, wireless components, chips, boards, microprocessors, inputs, outputs, displays, control components, etc. may be used. Generally, unless otherwise indicated, the materials for making embodiments of the invention and/or components thereof may be selected from appropriate materials such as metal, metallic alloys, ceramics, plastics, etc. Unless otherwise indicated specifically or by context, positional terms (e.g., up, down, front, rear, distal, proximal, etc.) are descriptive not limiting. Same reference numbers are used to denote same parts or components.

[0068] As illustrated in FIGS. 1 to 3A-B, an injection device or injection pen in accordance with the present application comprises a dose setting mechanism, a flange 5, a carpoule or ampoule 4 containing medicament, a carpoule holder 3, a needle 2 and a protective cap 1.

[0069] The flange 5 is snapped onto a threaded rod 9, which extends out of the dose setting mechanism. The carpoule 4 is retrained between the carpoule holder 3 and a housing 6 of the dose setting mechanism, which snap fit one in the other. As will be described in further detail below, in some embodiments, the dose setting mechanism comprises a mechanism for increasing the ratio of the force, restrictor elements and coupling elements.

[0070] The mechanism for increasing the ratio of the force comprises a threaded sleeve 10 (FIGS. 5A-C) locked in the housing 6 (FIGS. 4A-D) in a thread 10a in which runs or travels an operating element 11 (FIGS. 6A-C) which can be screwed out, which rotates a threaded rod 9 (FIGS. 9A-C) running in the thread of the housing 6 via the coupling 12 (FIGS. 7A-C).

[0071] The coupling elements comprise a coupling 12 linearly guided on the threaded rod 9, the teeth 12a of which are able to mesh with teeth 11a of the operating element 11, and a dose setting knob 13 (FIGS. 8A-C) which absorbs the force applied by the user and transmits it to the coupling 12.

[0072] The restrictor elements comprise a restrictor sleeve 8 (FIGS. 10A-C) which constitutes a maximum dose restriction or restrictor 300 in conjunction with the thread end 9a of the threaded rod 9, and a counter-rotation lock 7 (FIGS. 11A-C) which prevents the threaded rod 9 from being rotated in one direction relative to the housing 6. It snaps axially with the restrictor sleeve 8 by snappers 7a and in conjunction with it constitutes a radial dose clicking mechanism including, in part, arms 7b.

[0073] FIG. 1 illustrates an embodiment of a dose setting device in accordance with the present application, whereby the dose setting function, in other words the movement by which the outwardly rotated operating element 11 is pushed in as the dose is being primed, is transmitted by a rotating movement of the coupling 12 which is coupled, after priming, directly to the threaded rod 9.

[0074] Accordingly, the embodiment of FIG. 1 may be referred to and/or thought of as a rotating pen. In other words, an axial movement is converted into a rotating movement and transformed back again. The operating element 11 does not apply force directly to the threaded rod 9.

[0075] The threaded rod 9 is locked to the housing 6 so as to rotate in unison with it by a uni-directional or one-way ratchet coupling 7. The ratchet coupling 7 is locked to the threaded rod 9 to rotate in unison with it via a key-groove connection 7c, 9b. Consequently, the threaded rod 9 can only screw or turn forward in the distal (forward) direction, guided by a thread 6a of the housing 6.

[0076] The operating element 11 is guided by an external thread 11b in an internal thread 10a of the threaded sleeve 10 secured to the housing or of the housing 6. When the dose is being primed, the operating element 11 is rotated out of the housing 6, wherein the operating element 11 moves axially and in the direction of rotation relative to the threaded rod 9 retained in the housing 6.

[0077] A restrictor nut 8 is locked to prevent any rotation relative to the setting or operating element 11. The nut 8 is locked by a groove 8a extending in the axial direction in which an axially extending web 11c of the operating element 11 locates, but is able to move axially relative to it.

[0078] During a rotating movement of the operating element 11, the restrictor nut 8 rotationally locked to the operating element 11 is rotated with it. The threaded rod 9 is locked in the housing 6 by the ratchet coupling 7 to prevent a rotation when the dose is being primed or the operating element 11 is being screwed out. As a result, the restrictor nut 8 screws on the threaded rod 9 in the proximal direction.

[0079] Before the start of the dispensing movement, the threaded rod 9 is coupled with the rotating element 11 in a rotationally locked arrangement. However, the operating element 11 and threaded rod 9 are able to move axially relative to one another. An element guided externally to the threaded rod 9 is provided as coupling 12, which is rotationally locked to the threaded rod 9 by a key-groove 9b, 12b. Disposed on the operating element 11 at the end face are circumferentially extending crowns 11a pointing in the proximal direction, which are able to mesh in oppositely lying claws 12a of the coupling element 12 at the end face pointing in the distal direction. As the operating element 11 is rotated out, the operating element 11 is able to move relative to the coupling element 12 because there is no force acting on the coupling element 12 in the distal direction. The claws 12a and crowns 11a run or slip past one another during the rotating movement of the operating element 11. As the dose is being primed, the coupling element 12 is prevented from rotating in the housing 6 due to the rotation-lock of the threaded rod 9, which is locked by a unilateral ratchet coupling 7 so that it cannot rotate relative to the housing 6.

[0080] During triggering, a force is applied to the coupling element 12 in the distal direction via the push knob 13 snap-fitted onto the coupling element 12 so that the coupling 12 is locked to prevent it from rotating relative to the operating element 11 due to the mutually meshing crowns 11a and claws 12a. The operating element 11 rotates during the pushing-in movement due to the thread guide (formed by elements 11b, 10a) in the internal thread inside the housing 6. Since the operating element 11 is locked so as to rotate in unison with the coupling element 12, the rotating movement of the operating element 11 is transmitted to the threaded rod 9 which is rotationally locked to the coupling 12. The threaded rod 9 therefore rotates and is screwed inwardly in the distal (forward or dispensing) direction, guided by the internal thread 6a of the housing 6.

[0081] The restrictor nut 8 runs or travels on the threaded rod 9 and has an internal thread 8c in which the external thread 9c of the threaded rod 9 locates or is received.

[0082] The restrictor nut 8 may be screwed in the proximal (rearward) direction relative to the threaded rod 9, but only during the dose setting operation. During the dispensing operation, the restrictor nut 8 remains in the same position relative to the threaded rod 9 because the operating element 11 and threaded rod 9 are locked by the coupling 12 to rotate in unison and is moved back into its initial position together with the threaded rod 9. Consequently, the restrictor nut 8 is moved back to the same position in the pen (in what may be thought of and/or referred to as a pendulum movement) after the priming and dispensing movement. However, the position on the threaded rod 9 changed during the priming operation. The restrictor nut 8 is moved in the proximal direction relative to the threaded rod 9 during priming. The restrictor function of the restrictor nut 8 is achieved by a stop 9a on the threaded rod 9, which prevents the operating element 11 from being screwed farther out during priming when the restrictor nut 8 is lying against the stop.

[0083] Only the threaded rod 9 travels across a predefined maximum distance defined by the initial axial position of the restrictor nut 8 on the threaded rod 9, e.g. the axial distance from the initial axial position of the restrictor nut 8 to a threaded rod stop, which corresponds to the total quantity of medicament to be administered from the ampoule, for example 300 units. The same is not true of the restrictor nut 8, which effects the pendulum movement inside the pen.

[0084] Due to this design of the restrictor nut 8, the restrictor function can already be assured during priming of the dose because in the case of the last administered dose, the restrictor nut 8 is already in abutment with the stop 9a of the threaded rod 9 and blocks any further increase in dose or outward screwing of the operating element 11.

[0085] The threaded rod 9 has a lock to prevent a counter-rotation relative to the housing 6 in the form of a uni-directional coupling or counter-rotation lock 7. The counter-rotation lock 7 is axially coupled with the pendulum restrictor 8 by a snapper hook 7a.

[0086] The pendulum restrictor 8 and counter-rotation lock 7 can be rotated relative to one another via a dose clicking mechanism, created by the arms 7b passing across the teeth 8b of the restrictor nut 8.

[0087] Since functions, such as restricting the dose and locking a counter-rotation, are integrated inside the injection device, the setting element, respectively the dose setting knob of the operating element 11 and the trigger knob 13 retained in the coupling element 8, may be kept relatively flat, i.e. the height of the dose setting knob can be reduced, as a result of which the stroke movement needed by a patient's thumb to inject a set dose may be reduced.

[0088] During dispensing, the pendulum restrictor 8 and counter-rotation lock 7 are coupled and thus rotate in unison so that there are no clicking noises.

[0089] The counter-rotation lock 7 has snappers 7d biased radially outwardly, which locate in catches 6b of the circumferentially extending housing 6. During dispensing, the counter-rotation lock 7 rotates relative to the housing 6 and is therefore able to generate clicking noises. When the dose is being set or the dose is being corrected, the counter-rotation lock 7 is secured to the housing and therefore generates no clicking noises.

[0090] During clicking, apart from generating a noise, a tactile feedback may be generated for a user.

[0091] A stop 11c of the operating element 11 and a stop 10b of the threaded sleeve 10 restrict the maximum settable individual dose (these elements may be thought of and/or referred to as a restrictor 60).

[0092] FIG. 14A illustrates a dose setting device of an injection device based on a another embodiment, where the dose setting function, i.e. the inward movement of the operating element 11 screwed out (see FIG. 14B) during the process of setting the dose, is achieved by a rotating movement of the coupling 12, which is coupled once the dose has been set, transmitted directly to the threaded rod 9.

[0093] In accordance with some embodiments of the present invention, it is possible to obtain an increase in ratio and/or a decrease in ratio between a setting or dose setting element 11 and a driving element 9, for example when the dose is being set and/or when the dose is being administered.

[0094] The threaded rod 9 is locked to prevent a counter-rotation, for example by a ratchet coupling 7. The ratchet coupling 7 may be mounted on or carried by the housing 6. The ratchet coupling 7 is locked to rotate in unison with the threaded rod 9 by a key-groove or other suitable connection. In another embodiment, the ratchet coupling 7 may also be provided with an additional thread running in the opposite direction on the threaded rod 9. The threaded rod 9 can therefore only be screwed or turned forward in the distal direction, guided by the thread 6a of the housing 6.

[0095] The operating element 11 is guided in an internal thread 6c of the housing 6 by an external thread 11b. When setting the dose, the operating element 11 is screwed or turned out of the housing 6, as illustrated in FIG. 14B, wherein the operating element 11 moves axially and in the direction of rotation relative to the threaded rod 9 retained in the housing 6.

[0096] A restrictor nut 8 is locked or fixed so that it cannot rotate relative to the setting or operating element 11, for example by a web or projection 11c on the internal face of the operating element 11. The web 11c extends in the axial direction, illustrated in FIG. 14C, and is received in or locates in an axially extending groove 8a of the restrictor nut 8. The restrictor nut 8 travels on the threaded rod 9 and has an internal thread 8c in which the external thread 9c of the threaded rod 9 locates.

[0097] During a rotating movement of the operating element 11, the restrictor nut 8 rotationally locked to the operating element 11. The threaded rod 9 is locked to prevent rotation in the housing 6 when priming the dose or screwing out the operating element 11. As a result, the restrictor nut 8 is screwed on the threaded rod 9 in the proximal direction.

[0098] Before the start of the dispensing movement, the threaded rod 9 is coupled with the operating element 11 to prevent a relative rotation. However, the operating element 11 and threaded rod 9 are able to move axially relative to one another. An element guided externally to the threaded rod 9 is provided as the coupling 12, as illustrated in FIG. 14D, which is locked by a positive connection to the threaded rod 9 to rotate in unison with it. Crowns or claws 11a are provided on the operating element 11 at the end, pointing in the proximal direction, as illustrated in FIG. 14E, which are able to mesh with oppositely lying circumferentially extending crowns or claws 12a at the end of the coupling element 12 pointing in the distal direction. As the operating element 11 is being screwed out, the operating element 11 is able to rotate relative to the coupling element 12 because no force acts on the coupling element 12 in the distal direction. The claws 11a and 12a run or slide past one another during the rotating movement of the operating element 11. When the dose is being primed, the coupling element 12 is locked to prevent rotation in the housing 6 due to the rotation-lock inside the threaded rod 9, which is locked to prevent rotation in the housing 6, e.g. by a ratchet mechanism.

[0099] During triggering, a pressure is applied, via a trigger knob 13, to the coupling or coupling element 12 in the distal direction so that the coupling or coupling element 12 is locked to rotate in unison with the operating element 11 due to the mutually meshing crowns or claws 11a and 12a. As it is pushed in, the operating element 11 rotates due to the guiding action of the thread in the internal thread 6c inside the housing 6. Due to the fact that the operating element 11 is locked to rotate in unison with the coupling or coupling element 12, the rotating movement of the operating element 11 is transmitted to the threaded rod 9 rotationally locked to the coupling or coupling element 12. The threaded rod 9 therefore rotates and is screwed or turned inwardly in the distal direction, guided by the internal thread 6a of the housing 6.

[0100] The restrictor nut 8 screws or moves in the proximal direction relative to the threaded rod 9 only when the dose is being primed. During dispensing, the restrictor nut 8 remains in the same position relative to the threaded rod 9 because the operating element 11 and the threaded rod 9 are locked in rotation by the coupling element 12, and is moved back into its initial position with the threaded rod 9. Consequently, the restrictor nut 8 is moved back to the same position (in what may be thought of and/or referred to as a pendulum movement) in the pen after the priming and dispensing movement. However, the position on the threaded rod 9 changed during priming. The restrictor nut 8 is moved in the proximal direction relative to the threaded rod 9 during priming. The restrictor function of the restrictor nut 8 is achieved by a stop (axial or in the circumferential direction) on the threaded rod 9. This prevents the operating element 11 from being screwed out farther once the restrictor nut 8 is lying against the stop when the dose is being set.

[0101] FIG. 14B illustrates a state in which the restrictor nut 8 has reached the thread end of the threaded rod 9 and can therefore be turned no farther, so that a further increase in the dose or outward screwing of the operating element 11 is not possible.

[0102] In this embodiment, the threaded rod 9 travels a predefined maximum distance, defined by the initial axial position of the restrictor nut 8 on the threaded rod 9, e.g. the axial distance from the initial axial position of the restrictor nut 8 to a threaded rod stop, which corresponds to the total quantity of medicament to be dispensed from the ampoule, e.g. 300 units. The same is not true of the restrictor nut 8, which effects a pendulum movement inside the pen.

[0103] As a result of this design of the restrictor nut 8, the restrictor function can be assured during the priming operation because in the case of the last dose to be dispensed, the restrictor nut 8 is already lying against the stop of the threaded rod 9 and blocks another increase in the dose or outward screwing of the operating element 11.

[0104] The threaded rod 9 has a lock to prevent a counter-rotation relative to the housing 6. The lock may be provided in the form of a known or suitable uni-directional or one-way coupling 7. The counter-rotation lock is axially coupled with the pendulum restrictor 8 in FIG. 14F, e.g.

[0105] with a snapper hook 7a. The pendulum restrictor 8 and counter-rotation lock 7 are able to rotate freely relative to one another.

[0106] Again, since functions such as restricting the dose and preventing a counter-rotation are integrated inside the injection device, the setting element (which may be thought of and/or referred to as comprising the dose setting knob or the proximal part of the operating element 11 and the trigger knob 7 retained in the coupling element 12), may be of a relatively flat design, in other words the height of the dose setting knob can be reduced, as a result of which the stroke movement needed by a patient's thumb to inject a set dose can be reduced.

[0107] In one embodiment, a clicking or noise-producing element may be disposed between the pendulum restrictor 8 and the counter-rotation lock 7, e.g. a snapper biased radially outwardly from the pendulum restrictor 8 locates in catch elements of the circumferentially extending counter-rotation lock 7 or vice versa. During dispensing, the pendulum restrictor 8 and counter-rotation lock 7 are coupled and thus rotate in unison, so that no clicking noises are generated.

[0108] The counter-rotation lock 7 has snappers 7d biased radially outwardly which locate in catches of the circumferentially extending housing 6. During dispensing, the counter-rotation lock 7 rotates relative to the housing 6 and is therefore able to generate clicking noises. When the dose is being set or when the dose is being corrected, the counter-rotation lock is secured to the housing and does not therefore generate any clicking noises.

[0109] In addition to generating a noise during the clicking action, a tactile feedback may also be produced for a user.

[0110] In an alternative embodiment, the clicking mechanism is not disposed between the pendulum restrictor 8 and counter-rotation lock 7 and instead the pendulum restrictor 8 and counter-rotation lock 7 each have clicking elements, provided in the form of snapper arms biased radially outwardly which locate in catches of the housing 6. As a result, so-called “double clicks” can be generated during dispensing because in this instance both the pendulum restrictor 8 and counter-rotation lock 7 both rotate relative to the housing. When the dose is being set, only a “single click” is generated by the pendulum restrictor 8 because the counter-rotation lock 7 is secured to the housing.

[0111] In accordance with the present invention, including but not limited to the exemplary embodiments and exemplary preferred embodiments described herein, an injection device or dose setting device may independently incorporate other features, including the following features, either individually or in combination:

[0112] 1. Step-down in ratio of the inward screwing movement of the dose setting sleeve 11 to the relatively shorter axial inward screwing movement of the threaded rod 9 during dispensing (both coupled in a rotationally locked arrangement).

[0113] 2. Joint (same) rotation of the dose setting sleeve 11, coupling element 12, restrictor sleeve 8, counter-rotation lock (ratchet coupling) 7 and threaded rod 9 during dispensing.

[0114] 3. Dose correction option based on a simple counter-rotation (inward turning or screwing) of the dose setting sleeve 11.

[0115] 4. Restriction 300 due to the abutment of the restrictor nut 8 on the threaded rod 9 (producing or providing a pendulum movement of the restrictor nut 8).

[0116] 5. Counter-rotation lock due to the ratchet coupling 7 (counter-rotation lock profiling in the housing 6 at least across the axial length of a maximum settable dose).

[0117] 6. Restriction 60 due to a radial abutment of the dose setting sleeve 11 on the housing 6 (e.g. a threaded sleeve 10 secured to the housing).

[0118] 7. Axial coupling of the counter-rotation lock 7 and pendulum restrictor 8 to prevent axial movement but permit a relative rotation (clicking when setting the dose).

[0119] 8. No “dispensing clicks” generated by the “dose setting clicking elements” between the counter-rotation lock 7 and pendulum restrictor 6 (only by the counter-rotation lock 7 and housing 6).

[0120] 9. Rotationally locked coupling between the threaded rod 9 and operating element 11 by coupling element 12 (and push knob 13) during dispensing.

[0121] Embodiments of the present invention, including preferred embodiments, have been presented for the purpose of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms and steps disclosed. The embodiments were chosen and described to illustrate the principles of the invention and the practical application thereof, and to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth they are fairly, legally, and equitably entitled.