cap

Abstract

To provide a medicament delivery device that prevents a cap assembly from being reattached.SOLUTION: A cap assembly comprises a cap body configured to be detachably attached to a housing of a medicament delivery device, and a cap lid configured to be attached to the cap body. The cap body is configured to receive a needle sleeve of the medicament delivery device through a proximal end of the cap body and the cap lid at a distal end of the cap body when the cap assembly is attached to the medicament delivery device in the ready-to-use position thereof. The cap lid is such that, after the cap assembly is removed and the medicament delivery device is used, an anti-recapping element comprises a projection extending in the proximal direction and is configured to engage the needle sleeve of the medicament delivery device to prevent the cap assembly from being fully reattached to the housing upon attempted recapping once the medicament delivery device has been used.SELECTED DRAWING: Figure 8b

Description

[Technical field]

[0001] The present invention relates to a cap for a drug delivery device, in particular but not exclusively for an injection device. The present invention also relates to a method for assembling said cap and for preventing refitting of said cap onto the drug delivery device. [Background technology]

[0002] Injection devices, such as auto-injectors, are known in the art for administering medication to an injection site on a patient. Such injection devices typically include a body and a cap. An injection syringe resides within the body and is sometimes covered by a needle guard. A cap and needle shield are removably attached to the body to shield the needle of the needle syringe. To administer the medication, the cap and needle shield are first removed from the body to expose the needle. The needle is then inserted into the patient's body at the injection site and the medication is administered.

[0003] After the drug is delivered to the patient's body at the injection site, the cap is reattached to the body of the conventional injection device. However, in this case, it is impossible to tell from the cap position whether the injection device has been used before. Therefore, reusing a used injection device may result in the drug not being delivered to the patient's body and the spread of infection, etc. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT It is an object of the present invention to provide an improved cap. [Means for solving the problem]

[0005] According to the present invention, there is provided a cap assembly for a drug delivery device comprising: a cap body configured to be removably attached to a housing of the drug delivery device; and a cap lid configured to be attached to the cap body, wherein the cap body and the cap lid are two separate components configured to be separately positioned at a distal end of the drug delivery device in their ready-for-use positions; the cap body is configured to receive a needle sleeve of the drug delivery device through a proximal end of the cap body and the cap lid at a distal end of the cap body when the cap assembly is attached to the drug delivery device in its ready-for-use position; and the cap lid includes a re-capping prevention element configured to prevent the cap assembly from being re-attached to the housing of the drug delivery device after the cap assembly has been removed and the drug delivery device has been used, the re-capping prevention element including a proximal extending protrusion configured to engage with the needle sleeve of the drug delivery device to prevent the cap assembly from being fully re-attached to the housing of the drug delivery device when an attempt is made to re-cap the drug delivery device after the drug delivery device has been used.

[0006] The cap lid may include a first locking element and the cap body may include a second locking element, the first and second locking elements configured to cooperate to retain the cap lid within the cap body after the cap lid is attached to the cap body.

[0007] The protrusion may form an anti-recapping element extending from the lid portion of the cap lid. The first locking element may also be located on the protrusion.

[0008] The anti-recapping element may be configured to engage the needle sleeve when the cap lid is attached to the cap body to move the needle sleeve proximally to a ready-to-use position within the medication delivery device.

[0009] The anti-recapping element may extend longitudinally a predetermined distance from the lid portion of the cap lid and is configured to move the needle sleeve proximally such that the second locking element of the needle sleeve is moved proximally past the first locking element of the main body of the medication delivery device.

[0010] The cap body may include a cap lid retaining element configured to partially retain the cap lid within the cap body prior to attachment of the cap lid to the cap body by cooperation of the first and second locking elements of the cap lid and the cap body.

[0011] The cap body is configured to be at least partially received within a housing of a medication delivery device.

[0012] The cap body may include a shoulder formed between the distal and proximal sections of the cap body, the shoulder configured to abut the distal end of the main body of the medication delivery device when in the ready-to-use position.

[0013] The proximal section of the cap body may be configured to extend longitudinally a predetermined distance within the main body of the medication delivery device to move the locking element of the needle sleeve to an unlocked position when the cap body is attached to the main body of the medication delivery device.

[0014] According to another aspect of the invention, there is provided a subassembly for a medication delivery device comprising: a housing having proximal and distal ends and including a first locking element; a cap assembly as claimed in any one of the preceding claims; and a needle sleeve at least partially received within the housing and configured to be moved proximally to expose the needle during use, the needle sleeve including a second locking element, wherein when the subassembly is in a ready-to-use position, a cap body is attached to a distal end of the housing, the second locking element of the needle sleeve is moved to an unlocked position, and a cap lid is attached to a distal end of the cap body. a subassembly engaged or at least partially received in the cap body so as to be engaged with the housing after the cap assembly is removed from the housing and the subassembly is in its post-use position, the needle sleeve is in the post-use position and the second locking element is moved to a locking position in which the second locking element is engageable with the first locking element to at least limit the distance the needle sleeve may be moved proximally relative to the housing during a reattachment attempt, and an anti-recapping element on the cap lid engages the needle sleeve to prevent the cap assembly from being fully attached to the housing after the needle sleeve is in its post-use position.

[0015] According to a further aspect of the present invention there is provided a drug delivery device comprising a housing, a syringe having a needle at one end, a needle sleeve and a cap assembly as defined in any one of claims 1-10.

[0016] The syringe may contain a medication.

[0017] According to another aspect of the present invention, there is provided a method of priming a drug delivery device, comprising: The method includes the steps of: placing a cap body over the needle sleeve; moving the cap body proximally into a housing of the medication delivery device until a proximal end of the cap body moves a locking element on the needle sleeve to its unlocked position; moving the needle sleeve proximally until the locking element on the needle sleeve is moved proximally past the locking element on the housing; and moving the cap lid proximally onto the cap body until the cap lid is fixedly attached to the cap body.

[0018] The steps of moving the needle sleeve and the cap lid proximally relative to the housing may be completed simultaneously by using the cap lid to move the needle sleeve proximally.

[0019] According to another aspect, there is provided a cap assembly for a drug delivery device comprising a cap body configured to be removably attached to a housing of the drug delivery device and a cap lid configured to be attached to the cap body, wherein the cap body and the cap lid are two separate components configured to be separately positioned at a distal end of the drug delivery device in their ready-to-use positions, and the cap body is configured to receive a needle sleeve of the drug delivery device through a proximal end of the cap body and the cap lid at a distal end of the cap body when the cap assembly is attached to the drug delivery device in its ready-to-use position.

[0020] According to another aspect, there is provided a cap for a drug delivery device including an integrally formed cap body and cap lid, the cap lid configured to be removably attached to a housing of the drug delivery device in a ready-to-use position, wherein the cap body is configured to receive a needle sleeve of the drug delivery device through a proximal end of the cap body when the cap assembly is attached to the drug delivery device in its ready-to-use position, and the cap body includes a re-capping prevention element configured to prevent the cap assembly from being re-attached to the housing of the drug delivery device after the cap assembly has been removed and the drug delivery device has been used, the re-capping prevention element including proximally extending legs configured to engage with the needle sleeve of the drug delivery device to prevent the cap assembly from being fully re-attached to the housing of the drug delivery device upon an attempt to re-cap after the drug delivery device has been used.

[0021] Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0022] [Figure 1A] FIG. 1 is a schematic side view of an auto-injector with a cap attached to the housing of the auto-injector. [Figure 1B] FIG. 1B is a schematic side view of the auto-injector of FIG. 1A with the cap removed from the housing. [Diagram 2] 1 is a perspective view of a drug delivery device according to the present invention; [Diagram 3] FIG. 2 is a schematic plan view of a cap body according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic cross-sectional perspective view of the cap body of FIG. [Diagram 5] FIG. [Figure 6a]6 is a schematic cross-sectional side view of a drug delivery device having the cap body of FIG. 3 and the cap lid of FIG. 5 in its pre-priming position, its ready-for-use position and its post-use position; [Figure 6b] 6 is a schematic cross-sectional side view of a drug delivery device having the cap body of FIG. 3 and the cap lid of FIG. 5 in its pre-priming position, its ready-for-use position and its post-use position; [Figure 6c] 6 is a schematic cross-sectional side view of a drug delivery device having the cap body of FIG. 3 and the cap lid of FIG. 5 in its pre-priming position, its ready-for-use position and its post-use position; [Figure 7] FIG. 2 is a schematic perspective view of a cap lid according to the first embodiment of the present invention. [Figure 8a] 1A-1C are schematic cross-sectional front views of a medication delivery device according to the present invention including an anti-recapping element, shown in its pre-primed position, its ready-for-use position, and its post-use position. [Figure 8b] 1A-1C are schematic cross-sectional front views of a medication delivery device according to the present invention including an anti-recapping element, shown in its pre-primed position, its ready-for-use position, and its post-use position. [Figure 8c] 1A-1C are schematic cross-sectional front views of a medication delivery device according to the present invention including an anti-recapping element, shown in its pre-primed position, its ready-for-use position, and its post-use position. [Figure 9] FIG. 6 is a schematic cross-sectional perspective view of a cap body according to a second embodiment of the present invention. [Figure 10] 10 is an enlarged schematic view of the cap body of FIG. 9. [Figure 11] FIG. 4 is a schematic perspective view of a cap lid according to a second embodiment of the present invention. [Figure 12a] 12A-12C are schematic cross-sectional front views of a medication delivery device including a cap lid and an anti-recapping element as shown in FIG. 11 in its pre-priming position, its ready-to-use position, and its post-use position. [Figure 12b]12A-12C are schematic cross-sectional front views of a medication delivery device including a cap lid and an anti-recapping element as shown in FIG. 11 in its pre-priming position, its ready-to-use position, and its post-use position. [Figure 12c] 12A-12C are schematic cross-sectional front views of a medication delivery device including a cap lid and an anti-recapping element as shown in FIG. 11 in its pre-priming position, its ready-to-use position, and its post-use position. [Figure 13] FIG. 11 is a schematic cross-sectional perspective view of a cap lid according to a third embodiment of the present invention. [Figure 14] 14 is a schematic cross-sectional side view of a cap body of a third embodiment of the present invention partially attached to the cap lid of FIG. 13. [Figure 15a] 15 is a schematic cross-sectional front view of a drug delivery device including the cap lid of FIG. 13, the cap body of FIG. 14, and an anti-recapping element, shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 15b] 15 is a schematic cross-sectional front view of a drug delivery device including the cap lid of FIG. 13, the cap body of FIG. 14, and an anti-recapping element, shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 15c] 15 is a schematic cross-sectional front view of a drug delivery device including the cap lid of FIG. 13, the cap body of FIG. 14, and an anti-recapping element, shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 16a] 15a-15c in a schematic cross-sectional side view, showing the drug delivery device of FIG. 15a-c in its pre-primed position, its ready-for-use position and its post-use position; FIG. [Figure 16b] 15a-15c in a schematic cross-sectional side view, showing the drug delivery device of FIG. 15a-c in its pre-primed position, its ready-for-use position and its post-use position; FIG. [Figure 16c] 15a-15c in a schematic cross-sectional side view, showing the drug delivery device of FIG. 15a-c in its pre-primed position, its ready-for-use position and its post-use position; FIG. [Figure 17]FIG. [Figure 18] FIG. 2 is a schematic front view of a needle sleeve. [Figure 19] FIG. 20 is a schematic front view of the needle sleeve of FIG. 18 within a housing of a medication delivery device. [Figure 20a] 19 is a schematic cross-sectional front view of a drug delivery device including the cap of FIG. 17 and the needle sleeve of FIG. 18, the device being shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 20b] 19 is a schematic cross-sectional front view of a drug delivery device including the cap of FIG. 17 and the needle sleeve of FIG. 18, the device being shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 20c] 19 is a schematic cross-sectional front view of a drug delivery device including the cap of FIG. 17 and the needle sleeve of FIG. 18, the device being shown in its pre-priming position, its ready-for-use position, and its post-use position. [Figure 21a] 20a-20c in a schematic cross-sectional side view, showing the drug delivery device shown in FIGS. 20a-20c in its pre-primed position, its ready-for-use position and its post-use position; FIG. [Figure 21b] 20a-20c in a schematic cross-sectional side view, showing the drug delivery device shown in FIGS. 20a-20c in its pre-primed position, its ready-for-use position and its post-use position; FIG. [Figure 21c] 20a-20c in a pre-primed position, a ready-to-use position and a post-use position; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The drug delivery devices described herein are configured for injecting a patient with a medication. For example, delivery can be subcutaneous, intramuscular, or intravenous. Such devices can be operated by the patient or a caregiver, such as a nurse or doctor, and can include various types of safety syringes, pen injectors, or auto-injectors. The devices can include cartridge-based systems that require puncturing a sealed ampoule prior to use. The volume of medication delivered by these various devices can range from about 0.5 ml to about 3 ml. Yet another device can include a large volume device ("LVD") or patch pump, configured to adhere to the patient's skin for a period of time (e.g., about 5, 15, 30, 60, or 120 minutes) to deliver a "large" volume of medication (typically about 2 ml to about 10 ml).

[0024] Additionally, the devices described herein are customized to operate within required specifications in combination with a particular drug. For example, the device is customized to inject the drug within a particular time period (e.g., about 3 to about 20 seconds for an autoinjector, about 10 to about 60 minutes for an LVD). Other specifications can include low or minimal levels of discomfort, or specific conditions related to human factors, shelf life, expiration date, biocompatibility, environmental considerations, etc. Variations in such conditions can result from a variety of factors, such as, for example, drugs in the viscosity range of about 3 cP to about 50 cP. Thus, drug delivery devices often include hollow needles ranging in size from about 25 to about 31 gauge. Common sizes are 27 and 29 gauge.

[0025] The delivery devices described herein may also include one or more automated features. For example, one or more of needle insertion, drug injection, and needle retraction may be automated. Energy for one or more automated steps may be provided by one or more energy sources. The energy sources may include, for example, mechanical, pneumatic, chemical, or electrical energy. For example, mechanical energy sources may include springs, levers, elastomers, or other mechanical mechanisms for storing or releasing energy. One or more energy sources may be combined into a single device. The device may further include gears, valves, or other mechanisms for converting energy into movement of one or more components of the device.

[0026] The one or more automatic features of the auto-injector are each activated by an activation mechanism, which may include one or more of a button, lever, needle sleeve, or other activation components. Activation of an automatic feature may be a single-step or multi-step process; that is, the user must press and release a button to trigger the automatic feature. One or more activation components may need to be activated. For example, in a single-step process, the user may press the needle sleeve against their body to trigger an injection of the medication. Other devices may require multi-step activation of an automated function. For example, the user may need to depress a button and retract a needle shield to trigger an injection.

[0027] Additionally, activation of one automated function may activate one or more subsequent automated functions, thereby forming an activation sequence. For example, activation of a first automated function may activate at least two of needle insertion, drug injection, and needle retraction. Also, some devices may require a specific sequence of steps to cause one or more automated functions to occur. Other devices may operate in a series of independent steps.

[0028] Some delivery devices can include one or more features of a safety syringe, a pen injector, or an auto-injector. For example, a delivery device can include a mechanical energy source configured to automatically inject a medication (as typically found in an auto-injector) and a dose setting mechanism (as typically found in a pen injector).

[0029] According to some embodiments of the present disclosure, an exemplary drug delivery device 10 is shown in FIGS. 1A and 1B. The device 10 is configured for injecting a medication into a patient's body, as described above. The device 10 includes a housing 11, which typically includes a reservoir (e.g., a syringe) containing the medication to be injected, and components required to facilitate one or more steps of the delivery process. The device 10 may also include a cap assembly 12 that may be removably attached to the housing 11. Typically, a user cannot operate the device 10 without removing the cap 12 from the housing 11.

[0030] As shown, the housing 11 is substantially cylindrical and has a substantially constant diameter along a longitudinal axis AA. The housing 11 has a distal region D and a proximal region P. The term "distal" refers to a position relatively closer to the injection site and the term "proximal" refers to a position relatively farther from the injection site.

[0031] The device 10 also includes a needle sleeve 19 coupled to the housing 11 to allow movement of the sleeve 19 relative to the housing 11. For example, the sleeve 19 can move in a longitudinal direction parallel to the longitudinal axis AA. Specifically, movement of the sleeve 19 in a proximal direction can allow the needle 17 to extend from a distal region D of the housing 11.

[0032] Insertion of needle 17 can be accomplished by a number of mechanisms. For example, needle 17 is fixedly positioned relative to housing 11 and is initially positioned within an extended needle sleeve 19. The distal end of sleeve 19 is placed on the patient's body, and proximal movement of sleeve 19 by moving housing 11 distally exposes the distal end of needle 17. Such relative movement allows the distal end of needle 17 to extend into the patient's body. Such insertion is referred to as a "manual" insertion, since needle 17 is manually inserted by the patient manually moving housing 11 relative to sleeve 19.

[0033] Another form of insertion is "automatic," where needle 17 moves relative to housing 11. Such insertion can be triggered by movement of sleeve 19 or by another form of activation, such as, for example, button 13. As shown in FIGS. 1A and 1B, button 13 is located at the proximal end of housing 11. However, in other embodiments, button 13 is located at the proximal end of housing 11. It may also be located on the side of ring 11.

[0034] Other manual or automated functions can include drug injection or needle retraction, or both. Injection is the process in which the bung or piston 14 is moved from a proximal position within the syringe 18 to a more distal position within the syringe 18 to force the medicament out of the syringe 18 and through the needle 17. In some embodiments, the drive spring (not shown) is compressed before the device 10 is activated. The proximal end of the drive spring can be fixed within the proximal region P of the housing 11, and the distal end of the drive spring can be configured to apply a compressive force to the proximal face of the piston 14. After activation, at least a portion of the energy stored in the drive spring can be applied to the proximal face of the piston 14. This compressive force can act on the piston 14 to move it in a distal direction. Such distal movement acts to compress the liquid medicament within the syringe 18, forcing the liquid medicament out of the needle 17.

[0035] After injection, needle 17 may be retracted into sleeve 19 or housing 11. Retraction may occur when sleeve 19 moves distally as the user removes device 10 from the patient's body. This may occur when needle 17 remains fixedly positioned relative to housing 11. Sleeve 19 may be locked after the distal end of sleeve 19 moves past the distal end of needle 17 to cover it. Such locking may include locking any proximal movement of sleeve 19 relative to housing 11.

[0036] Another form of needle retraction may occur when the needle 17 is moved relative to the housing 11. Such movement may occur when the syringe 18 inside the housing 11 is moved proximally relative to the housing 11. This proximal movement may be achieved through the use of a retraction spring (not shown) located in the distal region D. The compressed retraction spring, when activated, may provide sufficient force to the syringe 18 to move it proximally. After sufficient retraction, any relative movement between the needle 17 and the housing 11 may be locked with a locking mechanism. Additionally, the button 13, or other components of the device 10, may be locked as desired.

[0037] 2, there is shown a drug delivery device 20 in accordance with the present invention. This drug delivery device is similar to the device 10 described above, and therefore like reference numerals are used for like features. As shown, the drug delivery device 20 includes cap assemblies 60, 70, 80 that are removably attachable to the housing 11. A user cannot operate the device 20 without removing the caps 60, 70, 80 from the housing 11.

[0038] As illustrated, the housing 11 has a substantially square cross-section and a substantially constant diameter along the longitudinal axis AA. However, it should be understood that the cross-section of the housing 11 may be any shape. The housing 11 has a distal region D and a proximal region P. The term "distal" refers to a position relatively closer to the injection site and the term "proximal" refers to a position relatively farther from the injection site.

[0039] 3 and 4, there can be seen schematic top and perspective cross-sectional views of a portion of the cap assembly 12 of the present invention. It should be understood that when the medication within the device 20 is to be injected into a patient, the cap assembly 12 is removed from the housing 11 of the medication delivery device 20 and is therefore not positioned relative to an injection site. However, for consistency in the description of the device 20, the end of the cap assembly 12 furthest from the housing 11 when the cap assembly 12 is attached to the housing 11 will be referred to as the distal region D'. When the cap assembly 12 is attached to the housing 11, that region will be referred to as the distal region D'. 7. Proximal region P′ of cap assembly 12 is the region of cap assembly 12 that is relatively far from the tip of needle 17 when cap assembly 12 is attached to housing 11.

[0040] The portion of the cap assembly 12 shown in Figures 3 and 4 is the cap body 21. The cap body 21 is configured to be removably attached to the distal end D of the housing 11 of the medication delivery device 20. The cap assembly 12 includes a cap body 21 and a cap lid 35, as described in more detail below. The cap body 21 is generally tubular and includes an open proximal end P' and a substantially open distal end D'. The open-ended cap body 21 allows the cap body 21 to be secured with tools from both ends during manufacturing and assembly, which eliminates the need for lifters and aids in ejection of members. The proximal end P' of the cap body 21 is configured to receive the needle sleeve 19 through the open end of the cap body 21 when the cap body 21 is attached to the housing 11 in its ready-to-use position. The distal end D' of the cap body 21 is configured to receive the cap lid through the open end of the cap body 21 when the cap lid is attached to the cap body 21.

[0041] The cap body 21 includes an outer wall member 22. The outer wall member 22 includes an outer surface 23, an inner surface 24, a distal end surface 25, and a proximal end surface 26. The outer wall member 22 further includes a shoulder 27 extending around the cap body 21. The shoulder 27 is located between the distal and proximal sections of the cap body 21. That is, the shoulder 27 is located between the proximal and distal end surfaces 25, 26 of the cap body 21. Preferably, the shoulder 27 is approximately in the center of the cap body 21 in the longitudinal direction. The shoulder 27 extends substantially perpendicular to the outer wall member 22 and parallel to the end surfaces 25, 26. The shoulder 27 divides the outer wall member 22 into a distal section 22a and a proximal section 22b.

[0042] The proximal section 22b of the outer wall member 22 is configured to be positioned within the distal end of the housing 11 when the cap body 21 is attached to the housing 11 and the device 20 is in its ready-to-use position. A shoulder 27 of the cap body 21 abuts the distal end of the housing 11 in its ready-to-use position. The cap body 21 is held within the housing 11 by friction between an outer surface 23b of the proximal section 22b of the outer wall member 22 and an inner surface of the housing 11. The friction is caused by an interference fit between the two members. Additionally, the outer surface 23b of the proximal section 22b may include at least one protrusion 28 that causes or enhances the interference fit.

[0043] The cap body 21 may further include an inner wall member 30. The inner wall member 30 is tubular, generally cylindrical, and contained within the outer wall member 22. The inner wall member 30 is configured to receive a needle shield (not shown). The inner wall member 30 may include a gripping element 31 configured to grip the needle shield when the cap body 21 is attached to the housing 11 and the device 20 is in its ready-to-use position. Thereafter, when the cap body 21 is removed from the housing 11, the gripping element 31 also ensures that the needle shield 32 is also removed from the housing 11. The inner wall member 30 is connected to the outer wall member 22 by a rib 33.

[0044] 5, there is shown a cap lid 35 for use with the cap assembly 12. The cap lid 35 is a separate component from the cap body 21. The cap lid 35 is coupled to the remainder of the medication delivery device 20 separately from the cap body 21. The cap lid 35 is positionable within the cap body 21. The term "inside" in relation to this application is intended to mean "substantially inside". That is, at least a portion of the cap lid 35 is configured to be received or positioned within the interior of the cap body 21.

[0045] The cap lid 35 includes a lid portion 36 configured to close the open distal end D' of the cap body 21 when the cap lid 35 is positioned within the cap body 21. The cap lid 35 has a first position in which the lid portion 36 of the cap lid 35 does not close the open end D' of the cap body 21 and a second position in which the lid portion 36 of the cap lid 35 closes the open end D' of the cap body 21. The first position of the cap lid 35 shown in FIG. 5 is when the cap lid 35 is not attached to the cap body 21, and the second position is when the cap lid 35 is coupled to the cap body 21.

[0046] The cap lid 35 further includes a locking element 37. The locking element 37 is configured to fixedly attach the cap lid 35 to the cap body 21 when the cap lid 35 is attached to the cap body 21. The cap body 21 may further include a corresponding locking element 38 shown in Figures 6a-6c. The locking element 38 is configured to cooperate with the locking element 37 of the cap lid 35 to fixedly attach the cap lid 35 to the cap body 21. The locking element 38 is located on or within the inner surface 24 of the distal section 22a of the outer wall member 22. The first locking element 37 extends outwardly toward the second locking element 38 and away from the central longitudinal axis of the medication delivery device 20.

[0047] As shown in FIG. 5, the cap lid 35 may further include a protrusion 39 extending from an inner surface 40 of the lid portion 36 of the cap lid 35. The protrusion 39 extends in a proximal direction. The protrusion may be, for example, but is not limited to, a leg 39. The locking element 35 is located on the leg 39 at a distance from the inner surface 40 of the lid portion 36, the distance corresponding to the distance between the distal end D' of the cap body 21 and the locking element 38 on the inner surface 24 of the outer wall member 22. The locking element 37 may be, for example, but is not limited to, a snap-fit ​​element, and the locking element 38 may be, for example, but is not limited to, a snap-fit ​​element or a recess. As will be understood by one skilled in the art, there may be multiple corresponding locking elements 37, 38 on each of the cap body 21 and the cap lid 35. The locking elements 37, 38 may be bonded or welded, for example, but is not limited to, by ultrasonic, laser, or friction. The cooperating locking elements 37, 38 are spaced equidistantly around the cap body 21 and cap lid 35 or are grouped into several regions. Preferably, the locking elements 37, 38 are spaced to induce an interference fit and prevent lateral movement between the cap body 21 and cap lid 35.

[0048] 6a-6c, which are schematic cross-sectional side views of the cap assembly 12 including the cap lid 35 shown in Figure 5 and the housing 11 of a drug delivery device 20, which is shown in its pre-priming position in Figure 6a, its ready-to-use position in Figure 6b and its post-use position in Figure 6c. The drug delivery device 20 including the housing 11, the needle sleeve 19 and the cap body 21 are part of this embodiment, but the cap lid 35 is not.

[0049] The locking element 37 of the cap lid 35 has a generally sawtooth profile, although it should be understood that the locking element 37 may be any other geometric shape that provides a locking function. The locking element 37 includes a first surface 37a and a second surface 37b. The first surface 37a is a locking surface configured to prevent the cap lid 35 from being removed from the cap body 21 after it has been attached to the cap body 21.

[0050] The locking surface 37a is configured to seat in a recess 38a of a locking element 38 of the cap body 21. The recess 38a includes a locking surface 38b that retains the locking surface 37a of the cap lid 35 within the recess 38a. Locking surfaces 37a, 38b extend generally perpendicular to the longitudinal axis of the medication delivery device 20. In some embodiments, the locking surfaces 37a, 38b may be angled and extend generally in a distal direction to provide more reliable locking of the two portions of the cap assembly 21.

[0051] The second surface 37b of the first locking element 37 is inclined generally in a distal direction to move the legs 39 inwardly during attachment of the cap lid 35 to the cap body 21. The legs 39 are elastically deformable such that after the first locking element 37 passes through the second locking element 38, the legs 39 spring back to their original position to position the first locking element 37 within the second locking element 38 of the cap body 21.

[0052] 6a shows the distal end D of the housing 11 of the medication delivery device 20 with the needle sleeve 19 received within the housing 11. The housing 11 is substantially hollow and includes an inner surface 41. The inner surface 41 of the housing 11 includes a first locking element 42. The first locking element 42 is configured to prevent, or at least limit, the needle sleeve 19 from moving proximally relative to the housing 11 beyond a predetermined point after use of the medication delivery device 20, as will be described in more detail below.

[0053] The first locking element 42 is also configured to allow movement of the needle sleeve 19 in a distal direction relative to the housing 11. In this embodiment, the first locking element 42 includes a protrusion extending inwardly from the inner surface 41 of the housing 11. As shown in Figure 6a, the protrusion has a generally sawtooth profile to allow distal movement of the needle sleeve 19 and prevent, or at least limit, proximal movement of the needle sleeve 19 beyond a predetermined point after use of the medication delivery device 20.

[0054] To achieve the above-mentioned functions, the protrusion has a first surface 44 and a second surface 45. The first surface 44 is configured to prevent the needle sleeve 19 from moving in a proximal direction beyond a predetermined point after use of the drug delivery device 20. The first surface 44 is an engagement surface configured for engagement by the needle sleeve 19 to prevent, or at least limit, proximal movement of the needle sleeve 19 relative to the housing 11 beyond a predetermined point after use.

[0055] In this embodiment of the drug delivery device 20, the first surface 44 extends perpendicular to the longitudinal axis of the drug delivery device 20; that is, it extends inwardly from the inner surface 41 of the housing 11 toward the central longitudinal axis of the drug delivery device 20. However, it should be understood that the first surface 44 may be configured with any geometry to prevent, or at least limit, proximal movement of the needle sleeve 19 beyond a predetermined point. Generally, the first surface 44 faces toward the distal region D of the housing 11. For example, in an alternative embodiment, the first surface 44 is angled toward the distal region D of the housing 11.

[0056] The second surface 45 is configured to permit movement of the needle sleeve 19 past a predetermined point in a distal direction after use of the medication delivery device 20, such that the needle sleeve 19 completely surrounds the needle 17, thereby preventing the needle 17 from accidentally piercing the patient's or caregiver's skin following injection of a medication into a target patient. The second surface 45 is a ramp that the needle sleeve 19 is configured to engage but allows unhindered movement therethrough in a distal direction, as described in more detail below.

[0057] In this embodiment of the medication delivery device 20, the second surface 45 extends generally inwardly from the inner surface 41 of the housing 11 at an oblique angle relative to the longitudinal axis of the medication delivery device 20 such that it forms an acute angle. The second surface 45 extends generally inwardly in the direction of the proximal region P of the housing 11. It should be appreciated that second surface 45 may be configured to have any other geometric shape that allows for distal movement of needle sleeve 19 after the medicament has been injected into the patient. For example, second surface 45 may include an arcuate profile, although alternatives are not limited to such shapes.

[0058] The needle sleeve 19 includes a main body 46 that is generally tubular and configured to extend around the needle 17 when the cap assembly 12 is removed from the housing 11 of the medication delivery device 20. During injection, the needle sleeve 19 is moved proximally relative to the housing 11, allowing the needle 17 to pierce the patient's skin.

[0059] The needle sleeve 19 further includes a second locking element 47 configured to cooperate with the first locking element 42 of the housing 11 to prevent, or at least limit, the needle sleeve 19 from moving in a proximal direction beyond a predetermined point after use of the medication delivery device 20, as described in more detail below. The locking element 47 has a locked position that can prevent proximal movement of the needle sleeve 19 and an unlocked position that can permit proximal movement of the needle sleeve 19.

[0060] In this embodiment, the second locking element 47 of the needle sleeve 19 includes an arm 48 having a free end 49 located outside the main body 46 of the needle sleeve 19 relative to the central longitudinal axis of the medication delivery device 20 .

[0061] The arm 48 of the second locking element 47 is configured to extend from the main body 46 of the needle sleeve 19 towards the inner surface 41 of the housing 11. The arm 48 extends at an acute angle with respect to the longitudinal axis of the drug delivery device 20 and thus generally towards the proximal region P of the drug delivery device 20. The free end 49 of the arm 48 is configured to engage the first surface 44 of the first locking element 42 of the housing 11 to prevent, or at least limit, the needle sleeve 19 from moving beyond a predetermined point. The arm 48 may be disposed or outwardly biased in its locking position and may be elastically deformable.

[0062] 6a, the needle sleeve 19 is first positioned in the open distal end D of the housing 11. During initial insertion of the needle sleeve 19 into the housing 11, the locking element 47 of the needle sleeve 19 is in its locking position such that proximal movement is stopped by contact between the first surface 44 of the first locking element 42 and the free end 49 of the arm 48.

[0063] The locking element 47 must be moved to its unlocked position so that the free end 49 of the arm 48 of the needle sleeve 19 can be moved over the projection 43 of the first locking element 42. To achieve this, the cap body 21 is inserted into the housing 11. The cap body 21 is inserted into the housing 11 such that the lower section 22b of the outer wall member 22 is located between the needle sleeve 19 and the inner surface 41 of the housing 11. The cap body 21 is configured such that the end face 26 of the outer wall member 22 can contact the arm 48 of the needle sleeve 19 when the cap body 21 is attached to the housing 11. That is, the inner surface 24 of the lower section 22b of the outer wall member 22 has substantially the same geometric shape and size as the needle sleeve 19.

[0064] The cap body 21 is then moved proximally until the shoulder 27 of the cap body 21 abuts the distal end D of the housing 11 of the medication delivery device 20. As the outer wall member 22 moves proximally relative to the needle sleeve 19, the lower section 22 of the outer wall member 22 b contacts arm 48 of second locking element 47. Initial contact between proximal end surface 26 of outer wall member 22 and arm 48 occurs adjacent the point where arm 48 extends from needle sleeve 19, i.e., the end of arm 48 opposite free end 49.

[0065] As the cap body 21 continues to move proximally relative to the needle sleeve 19, the proximal end surface 26 of the outer wall member 22 of the cap body 21 moves the arm 48 inwardly to its unlocked position, i.e., the arm 48 is pivoted about a point extending from the needle sleeve 19, thereby rotating the free end 49 of the arm 48 towards the needle sleeve 19 to substantially align the arm 48 with the longitudinal axis of the medication delivery device 20.

[0066] When the cap body 21 is fully attached to the housing 11, i.e. when the shoulder 27 is in contact with the distal end of the housing 11, the lower section 22b of the outer wall member 22 overlaps the arm 48 of the locking element 47 of the needle sleeve 19 by a distance such that the free end 49 of the arm 48 is inside the first surface 44 of the first locking element 42 of the housing 11. Thus, the free end 49 of the arm 48 can pass the first surface 44 of the locking element 42 of the housing 11 without contacting it when moved in the proximal direction.

[0067] Once the cap body 21 is in place, the cap lid 35 is attached to the cap body 21. The cap lid 35 is pressed into the distal end of the cap body 21. When the cap lid 35 is moved proximally relative to the cap body 21 and the legs 39 move into the cap body 21, the second surface 37b of the locking element 37 of the cap lid 35 contacts the inner surface 24 of the outer wall member 22 of the cap body 21 and the legs 39 are moved inwardly towards the longitudinal axis of the medication delivery device 20. When the first surface 37a of the locking element 37 moves past the first surface 38b of the recess 38a of the locking element 38 of the cap body 21, the legs 39 return to their original position. When the locking elements 37, 38 cooperate, the cap lid 35 is fixedly attached to the cap body 21.

[0068] The legs 39 are positioned on the cap lid 35 such that the legs do not contact the needle sleeve 19 when the cap lid 35 is attached to the cap body 21. For example, as shown in FIG. 6a, the legs 39 are positioned on the lid portion 36 of the cap lid 35 such that they are aligned with the lower section 22b of the outer wall member 22 or are positioned outside the lower section 22b of the outer wall member 22 relative to the central longitudinal axis of the medication delivery device 20. Thus, the legs 39 of the cap lid 35 are positioned between the upper section 22a of the outer wall member 22 and the needle sleeve 19, as shown in FIG. 6a. The cap lid 35 is pressed into the cap body 21 until the locking elements 37, 38 engage to hold the cap lid 35 inside the cap body 21.

[0069] A tool (not shown) is used to push the needle sleeve 19 proximally, as indicated by the arrow in FIG 6a, to move the locking element 47 of the needle sleeve 19 proximally past the locking element 42 of the housing 11. The tool contacts the distal end of the needle sleeve 19 through a hole 50 (shown in FIG 6a, but omitted in FIG 5) extending through the lid portion 36 of the cap lid 35.

[0070] 6b, the tool pushes the needle sleeve 19 proximally until the free end 49 of the arm 48 passes through the first surface 44 of the first locking element 42 of the housing 11. As the needle sleeve 19 moves proximally relative to the cap body 21, the arm 48 moves out of the lower section 22b of the cap body 21 and back to its locking position.

[0071] To use the drug delivery device 20 of the present invention with the cap assembly 12 shown in Figures 5-6c, the cap assembly 21 is removed and the device 20 is used as described above. After the device 20 has been used, the cap assembly 12 can be reattached to the housing 11 as shown in Figure 6c. Use of the cap assembly 12 using the cap lid 35 shown in Figures 5-6c allows for re-capping of the device. However, because the cap assembly 12 can be reattached to the housing 11, the position of the cap assembly 12 does not indicate to the user whether the device 20 has been used. The configuration of the device 20 after use is similar to the configuration of the device before it has been primed.

[0072] 7 to 9c, there is shown a cap assembly 60 according to a second embodiment of the present invention. The cap assembly 60 is similar to the cap assembly 12 described above with reference to Figs. 3 to 6c, and like features are given like reference numerals. Therefore, detailed description of like features will be omitted in this specification. The cap assembly 60 includes a cap body 61 which is the same as the cap body 21 described above.

[0073] 7, there is shown a cap lid 65 according to one embodiment of the present invention. The cap lid 65 has a similar structure to the cap lid 35 described above in relation to Figures 5 to 6c, and similar structures are given the same reference numbers.

[0074] There are two main differences between the cap lid 35 described above and the embodiment of the cap lid 65 shown in Fig. 7. First, the cap lid 65 does not include a hole extending through the lid portion 36 because no tool (not shown) is required to prime the drug delivery device 20 of the present invention after the cap lid 65 is attached to the cap body 61. The lack of a hole in the cap lid 65 ensures that the user is not confused about the usage of the device 20, i.e., does not think that the needle 17 extends out of a hole in the cap assembly 60 of the device 20, and the lack of a hole from the outside of the device 20 also reduces the possibility of the needle 17 being contaminated prior to use.

[0075] Second, the cap lid 65 of the present invention includes an anti-recapping element 66. The anti-recapping element 66 is configured to prevent the cap assembly 60 from being fully reattached to the housing 11 of the medication delivery device 20 after the cap assembly 60 has been removed and the medication device 20 has been used. The anti-recapping element 66 includes an anti-recapping surface 67 that is configured to engage the distal end D of the needle sleeve 19 when a user attempts to reattach the cap assembly 60 to the housing 11, as described in more detail below.

[0076] The anti-recapping element 66 includes a protrusion 39 extending proximally from the inner surface 40 of the lid portion 36 of the cap lid 65. That is, the anti-recapping element 66 extends from the surface 40 of the lid portion 36 of the cap lid 65, as does the locking element 37 located on the leg 39. In this embodiment, both the locking element 37 and the anti-recapping surface 67 are located on the leg 39 extending from the inner surface 40 of the lid portion 36 of the cap lid 65. However, in alternative embodiments, the cap lid 65 may include at least two legs 39, with one leg 39 including the locking element 37 and another leg 39 forming the anti-recapping element 66, as will be seen below. Although multiple protrusions 39 are shown in the drawings, it should be understood that the cap lid 65 may include only one protrusion 39, or any number of protrusions 39.

[0077] As described above, the anti-recapping surface 67 of the anti-recapping element 66 is configured to engage the distal end D of the needle sleeve 19 when a user attempts to reattach the cap assembly 60. 7 must be located at least as far from the longitudinal axis of the drug delivery device 20 as the needle sleeve 19, or at a shorter distance, so that it can contact the distal end D of the needle sleeve 19, as shown in Figures 8a-8c. To achieve this, the legs 39 of the cap lid 65 are located more centrally in the lid portion 36 of the cap lid 65 than the legs 39 of the cap lid 35.

[0078] To provide the anti-recapping function, the anti-recapping surface 67 of the anti-recapping element 66 formed by the protrusion 39 must extend into the cap body 61 such that when the cap assembly 60 is coupled, i.e., when the cap lid 65 is attached to the cap body 61, the distance between the distal end of the needle sleeve 19 and the distal end of the arm 48 of the locking element 47 is greater than the distance between the anti-recapping surface 67 of the anti-recapping element 66 and the proximal end surface 26 of the outer wall member 22. The importance of the relative distance will now be explained with reference to Figures 8a-8c.

[0079] 8a shows the first embodiment of the invention in its pre-priming position. As described above, in this position, the needle sleeve 19 is inserted into the distal end D of the housing 11 and the cap body 61 is attached to the distal end of the housing 11. The cap body 61 is attached to the housing 11 such that the shoulder 27 of the cap body 61 abuts the distal end D of the housing 11 and the proximal end face 26 of the lower section 22b of the outer wall member 22 has moved the locking element 47 from its locking position to its unlocked position. A tool (not shown) is then used to move the needle sleeve 19 proximally as indicated by the arrow in FIG. 8a before the cap lid 65 is attached to the cap body 61.

[0080] After the medication delivery device 20 has been primed as described above, the cap lid 65 is attached to the cap body 61, as shown in Fig. 8b. The legs 39 of the cap lid 65 are positioned at the open distal end D' of the cap body 61 and moved proximally until the two locking elements 37, 38 cooperate to secure the cap assembly 60 and close the cap body 61. As shown, the needle sleeve 19 is moved proximally a sufficient distance so as not to interfere with the attachment of the cap lid 65 to the cap body 61. That is, the cap lid 65 can be fully attached to the cap body 61 without contacting the distal end of the needle sleeve 19.

[0081] The legs 39 forming the anti-recapping element 66 are configured so that the anti-recapping surface 67 is located at a distance from the proximal end surface 26 of the outer wall member 22 of the cap body 61 that is greater than the distance between the distal end D of the housing 11 and the protrusion on the inner surface 41 of the housing 11.

[0082] After use, the housing 11 and needle sleeve 19 of the medication delivery device 20 are in the configuration shown in Figure 8c. The needle sleeve 19 has been moved distally relative to the housing 11 such that the free end 49 of the arm 48 of the second locking element 47 is closer to the distal end of the housing 11 than the first surface 44 of the protrusion of the first locking element 42.

[0083] When a user attempts to replace the cap assembly 60 on the housing 11, the user places the cap body 61 over the needle sleeve 19. However, during the process of moving the cap assembly 60 proximally relative to the housing 11, the anti-recapping surface 67 of the anti-recapping element 66 of the cap lid 65 engages the distal end of the needle sleeve 19. Thus, any further proximal movement of the cap assembly 60 also causes proximal movement of the needle sleeve 19.

[0084] However, the proximal end surface 26 of the cap body 61 contacts the arm 48 of the needle sleeve 19. Prior to the needle sleeve 19 being displaced proximally, the anti-recapping surface 67 of the anti-recapping element 66 engages the distal end of the needle sleeve 19. Thus, when the needle sleeve 19 is moved proximally, the arm 48 is in its locking position. Because the distance between the anti-recapping surface 67 of the anti-recapping element 66 and the proximal end face 26 of the cap body 61 is greater than the distance between the distal end D of the housing 11 and the protrusion 43 on the inner surface 41 of the housing 11, distal movement of the cap assembly 60 and the needle sleeve 19 is stopped when the free end 49 of the arm 48 engages the first surface 44 of the protrusion 43.

[0085] When the free end 49 of the arm 48 contacts the first surface 44 of the protrusion, proximal movement of the needle sleeve 19 relative to the housing 11 is prevented, or at least limited. If the user applies more force to the cap assembly 12, the arm 48 may deform. However, the arm 48 cannot pass over the protrusion, and therefore the needle sleeve 19 cannot move substantially in the proximal direction.

[0086] As a result, recapping of the cap assembly 60 on the housing 11 is prevented. Additionally, there is a gap 68 between the shoulder 27 of the cap body 61 and the distal end D of the housing 11, which provides a visual indicator to the user that the medication delivery device 20 has been used. Even when the arm 48 is deformed, the needle sleeve 19 does not move proximally enough for the shoulder 27 of the cap body 61 to abut the distal end D of the housing 11.

[0087] 9-12c, there is shown a cap assembly 70 according to a second embodiment of the present invention. The cap assembly 70 is similar to the cap assembly 60 described above in relation to Figures 3, 4, 7, and 8a-8c, and like features are given like reference numerals. Accordingly, a detailed description of like features will not be provided herein.

[0088] Figure 9 shows a perspective cross-sectional view of a cap body 71 similar to the cap body 61 described with reference to the first embodiment of the invention. In a second embodiment of the invention, the cap body 71 further includes a hole 72 extending through the shoulder 27 of the cap body 71. The hole 72 can be used for a tool (not shown) to hold the cap body during manufacturing and / or assembly. Additionally, a detailed view of the first locking element 37 of the cap body 71 can be seen. Figure 10 shows an enlarged view of the arrangement mentioned in relation to Figure 9.

[0089] 11 and 12a-12c, there is shown a second embodiment of a cap lid 75. Similar to the first embodiment of the cap lid 65, the cap lid 75 of the second embodiment includes a first locking element 37 located on a leg 39 extending from the inner surface 40 of the lid portion 36. The leg 39 further includes an anti-recapping element 66 having an anti-recapping surface 67 configured to prevent recapping of the cap assembly 70 onto the housing 11 after the medication delivery device 20 has been used.

[0090] 11, the first locking element 37 is shown at the end of the leg 39 opposite the lid portion 36. The proximal end of the leg 39, i.e., the end of the leg 39 opposite the lid portion 36, also includes an anti-recapping surface 67 of the anti-recapping element 66. However, it should be understood that in alternative embodiments, the first locking element 37 of the cap lid 75 may be located anywhere along the leg 39.

[0091] In a second embodiment of the present invention, the cap lid 75 further includes a tooling surface 76 configured to bias the needle sleeve 19 from its pre-primed position shown in FIG. 12a to its ready-to-use position shown in FIG. 12b. In this manner, the cap lid 75 can be used to mount a drug delivery device, as described in more detail below. 11, the tooling surface 76 can be the same surface as the anti-recapping surface 72. However, it should be understood that the two surfaces can be separate and independent, as shown in FIGS. 12a-12c.

[0092] 12a, the cap lid 75 includes legs 39 extending from the inner surface 40 of the lid portion 36. The locking element 37 is located at the proximal end of the legs 39, i.e., the end of the legs 39 opposite the lid portion 36. The locking element 37 includes a first surface 37a and a second surface 37b, similar to that described above with respect to the cap lid 35 shown in FIG. 5. The first surface 37a is a locking surface configured to engage a surface 38b of a recess 38a of the locking element 38 to prevent the cap lid 75 from being removed from the cap body 71 after it has been attached. The second surface 37b of the locking element 37 is angled to move the legs 39 inwardly until the locking element 37 is located in the recess 38a of the locking element 38 of the cap body 21.

[0093] 12a-c, the tooling surface 76 is located at the end of the leg 39. The anti-recapping surface 67 of the anti-recapping element 71 is formed parallel to the tooling surface 76, but spaced apart from it. Instead, the tooling surface 76 has a generally rectangular notch 77 on its inner side, closest to the longitudinal axis of the medication delivery device 20. The notch 77 extends along the inner edge of the tooling surface 76. The notch 77 forms a first surface 78 extending substantially parallel to the longitudinal axis of the medication delivery device 20, and the anti-recapping surface 67 extending substantially perpendicular to the longitudinal axis of the medication delivery device 20.

[0094] The notch 77 is configured to extend into the tooling surface 76 a distance short enough to allow the tooling surface 76 to contact the needle sleeve 19 during insertion of the cap lid 75 into the cap body 71 when the legs 39 are moved inward, but a distance large enough so that the tooling surface 76 does not contact the needle sleeve 19 during a recapping attempt.

[0095] In this embodiment, the locking element 37, anti-recapping element 66, and tooling surface 76 are located on legs 39 extending from the inner surface 40 of the lid portion 36 of the cap lid 75. However, in alternative embodiments, the cap lid 75 may include at least two legs 39, with one leg 39 including at least one of the locking element 37, anti-recapping element 67, and tooling surface 76, and another leg 39 including at least one of the locking element 37, anti-recapping element 66, and tooling surface 76. This is accomplished by varying the length and location of the legs 39 extending from the lid portion 36 of the cap lid 75.

[0096] Figure 12a shows the drug delivery device 20 of this embodiment in its pre-priming position. The introduction of the cap body 71 into the housing 11 is the same as described above with respect to Figures 6a-6c and 8a-8c, and therefore a detailed description will be omitted here.

[0097] As the cap lid 75 is pressed into the open distal end D of the cap body 71, the second surfaces 37b of the locking elements 37 at the ends of the legs 39 of the cap lid 75 are moved inwardly against the outer wall member 22, thereby bending the legs 39. The inward movement of the legs 39 causes tooling surfaces 76 at the ends of the legs 39 to move inwardly until the tooling surfaces 76 contact the distal end of the needle sleeve 19 as the cap lid 75 is moved proximally relative to the cap body 71.

[0098] The cap lid 75 is moved distally, the first surface 37a of the locking element 37 passes the first surface 38b of the recess 38 of the cap body 71, and the flexible, resilient legs 39 move back to their original position, fixedly positioning the cap lid 75 inside the cap body 71. At the same time, the lid portion 36 of the cap lid 75 closes the open distal end of the needle sleeve 19. The movement of the legs 39 back to their original position relative to the lid portion 36 moves the tooling surface 76 and the first surface 78 of the notch 77 away from the needle sleeve 19 and out of further contact with each other. That is, as shown in FIG. 12b, the tooling surface 76 and the first surface 78 of the notch 77 are moved away from the central longitudinal axis of the drug delivery device 20 relative to the main body 46 of the needle sleeve 19. The use of the drug delivery device 20 is the same as described above, and therefore will not be described in detail herein.

[0099] Figure 12c shows the drug delivery device 20 of the second embodiment of the present invention in a post-use configuration during a re-capping attempt. The anti-recapping process is the same as that described above with respect to Figures 8a-8c and therefore will not be described in detail herein. The main difference between the first and second embodiment is that in the second embodiment, the tooling surface 76 of the cap lid 75 is moved past the needle sleeve 19 without contacting the needle sleeve 19 and the anti-recapping surface 67 contacts the needle sleeve 19 as described above to prevent re-capping of the cap assembly 70 with the housing 11 of the drug delivery device 20.

[0100] 13 to 16c, there is shown a cap assembly 80 according to a third embodiment of the present invention. The cap assembly 80 has a similar configuration to the cap assembly 70 described above in relation to Figures 9 to 12c, and the same components are given the same reference numerals. Therefore, a detailed description of the similar components will be omitted.

[0101] A cap assembly 80 of a third embodiment of the present invention includes a cap body 81, as shown in FIG. 14. The cap body 81 includes a recess 82 located near its open distal end D. In this embodiment, the recess 82 extends a finite distance around the inner surface 24 of the distal section 22a of the outer wall member 22 of the cap body 81. The recess 82 in the inner surface 24 of the cap body 81 is longitudinally aligned with the recess 38a of the locking element 38 of the cap body 81. The recess 82 is located closer to the distal end of the cap body 81 than the recess 38a of the locking element 38.

[0102] Referring back to FIG. 13, the cap lid 85 of the third embodiment of the present invention includes at least two legs 86, 87 extending from the lid portion 36 of the cap lid 85. The first leg 86, the function of which is shown in FIGS. 15a-15c, is configured similarly to the leg 39 described in connection with the second embodiment shown in FIGS. 12a-12c. However, the anti-recapping surface 67 and the tooling surface 76 of the first leg 86 shown in FIGS. 15a-15c are the same surface. Because the first leg 86 is similar to and functions similarly to the leg 39 described in the second embodiment, a detailed description of the first leg 86 will be omitted herein.

[0103] The second leg 87 is configured to initially place the cap lid 85 partially within the cap body 81 without closing the open distal end D of the cap body 81. The second leg 87 includes a retention element 88 located at a proximal end of the leg 87, i.e., the end of the leg 87 opposite the lid portion 36 of the cap lid 85. The retention element 88 has a generally sawtooth profile similar to the profile described in connection with the locking element 37. That is, the retention element 88 includes a first surface 88a configured to retain the retention element 88 in the recess 82 of the cap body 81 and a second surface 88b configured to be angled such that the retention element 88 is biased out of the recess 82 when a proximal force is applied. The recess 82 defines a retention surface 83. 5, the retention surface 83 is configured to cooperate with the first surface 88a to partially retain the cap lid 85 within the cap body 81 prior to the priming step. This is advantageous as it obviates the need for a separate tool to hold the cap lid 85 in place relative to the cap body 81 prior to priming the medication delivery device 20.

[0104] Referring now to Figure 15a, there is shown a schematic cross-sectional front view of a third embodiment of a drug delivery device 20 in a pre-priming position. Figure 16a shows a schematic cross-sectional side view of the third embodiment of a drug delivery device 20 in the same pre-priming position.

[0105] Similar to the device 20 shown in Figures 8a and 12a, the device 20 is placed in its pre-priming position by placing the needle sleeve 19 in the open distal end D of the housing 11 and moving the needle sleeve proximally until the locking element 37 of the needle sleeve 19 engages the locking element 38 of the inner surface 40 of the housing 11. The cap body 81 is then attached to the housing 11 such that the lower section 22b of the outer wall member 22 is between the needle sleeve 19 and the inner surface 40 of the housing 11. As the cap body 81 is moved proximally, the proximal face 24 of the outer wall member 22 moves the locking element 47 from its locked position to its unlocked position. The cap body 81 is moved proximally until the shoulder 27 abuts the distal end D of the hose 11.

[0106] 16a, the cap lid 85 can then be partially attached to the distal end D' of the cap body 81. That is, the second leg 87 of the cap lid 85 can be partially disposed within the cap body 81 such that the cap lid 85 is partially retained within the cap body 81 without closing the open distal end D' of the cap body 81. This is done by disposing the retaining element 88 on the second leg 87 of the cap lid 85 in the recess 82 of the cap body 81.

[0107] As shown in FIG. 16a, when the retaining element 88 is located in the recess 82 of the cap body 81, the tooling surface 76 is located near or against the distal end of the needle sleeve 19, as shown in FIG. 15a. In some embodiments, as shown in FIGS. 15a-16c, the second leg 87 can be longer than the first leg 86, so that the cap lid 85 can be initially placed on the cap body 81 without moving the needle sleeve 19 proximally, and possibly without touching the needle sleeve 19 at all. More specifically, the retaining element 88 of the second leg 87 is farther from the lid portion 36 of the cap lid 85 than the tooling surface 76, the anti-recapping surface 67, and the locking element 47. In the embodiment shown in FIGS. 15a-16c, the anti-recapping surface 67 and the tooling surface 76 are the same surface.

[0108] The priming process for moving from the pre-primed position shown in Figures 15a and 16a to the ready-to-use position shown in Figures 15b and 16b is essentially the same as the process described above with reference to Figures 8a-8c and 12a-12c and therefore will not be described in detail herein.

[0109] When the retaining element 88 is located in the recess 82 of the cap body 81, the cap lid 85 can be moved proximally to fully place the cap lid 85 in its ready-to-use position as shown in Figures 15b and 16b. It should be appreciated that in one embodiment, the cap lid 85 can be attached to the cap body 81 before the cap body 81 is attached to the distal end D of the housing 11.

[0110] The anti-recapping process of the third embodiment of the medication delivery device 20 shown in Figures 15c and 16c is similar to the process described above with reference to Figures 8a-8c and 12a-12c. 16c, the arrangement of second leg 87 on lid portion 36 is configured such that retaining element 88 can cooperate with recess 82 on inner surface 24 without contacting needle sleeve 19 at any time during a priming or re-capping attempt.

[0111] 17-21c, a drug delivery device 100 is shown. The device 100 includes a housing 101 similar to the housing 11 described above, a cap assembly 102, and a needle sleeve 103. As shown in FIG. 17, the cap assembly 102 includes an integrated cap body 104 and a cap lid 105. That is, the cap assembly 102 is formed as one piece, rather than as two separate pieces. Otherwise, the cap assembly 102 is similar to the cap assembly 12 of the present invention described above.

[0112] The cap assembly 102 further includes an anti-recapping element 106 located at a proximal end P' of an elastically deformable leg 107 extending from a proximal end of the cap assembly 102. The anti-recapping element 106 includes an anti-recapping surface 108 configured to engage an abutment surface 190 of an inner surface 110 of the housing 101 shown in Figures 21a-21c. The anti-recapping element 106 further includes an angled surface 111 configured to move the anti-recapping element 106 at the proximal end of the leg 107 outwardly relative to a central longitudinal axis of the device 100 when a user attempts to reposition the cap assembly 102 on the housing 101 after the device 100 has been used, as described in more detail below.

[0113] 17, the cap assembly 102 has a plurality of legs 107. Specifically, the illustrated cap assembly 102 includes two sets of two legs 107a, 107b disposed opposite one another on the cap body 104 and extending from a lower portion of an outer wall member of the cap body 104. Each leg 107 may have an anti-recapping element 106 at its proximal end.

[0114] 18, the needle sleeve 103 is shown. The needle sleeve 103 includes a locking element 114 shown in the form of an arm 115 configured to engage a locking element 116 of the housing 101 to limit proximal movement of the needle sleeve 103 relative to the housing 101, in a similar manner as described above in connection with the present invention. The needle sleeve 103 further includes recesses 117 on its outer surface 118. The recesses 117 extend parallel to the longitudinal axis of the device 100. The number of recesses 117a, 117b is equal to the number of anti-recapping elements 106 of the cap assembly 102. As will be described in more detail below, one recess 117 is configured to at least partially receive one anti-recapping element 106.

[0115] 19, the drug delivery device 100 is shown with the needle sleeve 103 located on the housing 101 before the cap assembly 102 is attached to the device 100 to show the device 100 before priming. As shown, the recess 117 is visible to allow for attachment of the cap assembly 102 to the housing 101. As shown in FIG. 21c and described in more detail below, the recess 117 extends in a direction parallel to the longitudinal axis of the device 100 a distance at which a distal end of the recess 117 is visible before priming of the device 100 and at which a proximal end of the recess 117 is closer to the distal end of the housing 101 than the abutment surface 109 of the housing 101 after the device 100 has been used, providing an anti-recapping feature.

[0116] As shown in Figure 18, the locking element 116 of the needle sleeve 103 is circumferentially spaced from the recess 117 of the needle sleeve 103. The circumferential spacing between the gasket elements 116 and the recesses 117 is approximately 90 degrees, however, it should be understood that the spacing may vary in alternative devices.

[0117] 20a and 21a show the drug delivery device 100 in a pre-priming position with the cap assembly 102 omitted. The tool 120 is used to move the needle sleeve 103 proximally relative to the housing 101. The tool 120 is placed over the needle sleeve 103 and moved proximally in the direction of the arrow until the proximal end of the tool 120 contacts the locking element 114 of the needle sleeve 103 from its locked position to its unlocked position, thereby allowing the locking element 114 of the needle sleeve 103 to be moved proximally past the locking element 116 of the housing 101 to prime the device 100. The tool 120 is then removed, allowing the cap assembly 102 to be attached to the housing 101.

[0118] 21a-21c, distal end D of housing 101 includes a recessed region 122 extending proximally from a distal end face 123 of housing 101. Recessed region 122 is formed by a notch extending into inner surface 110 of housing 101. Recessed region 122 has a proximal end formed by an abutment surface 109 configured to be contacted by anti-recapping surface 108 of anti-recapping element 106 to limit proximal movement of needle sleeve 103 when a user attempts to reattach cap assembly 102 to housing 101 after device 100 has been used.

[0119] 20b and 21b show the cap assembly 102 attached to the housing 101 and device 100 in its ready-to-use position. To attach the cap assembly 102 to the housing 101, the proximal end of the cap assembly 102 is inserted into the open distal end of the housing 101 between the needle sleeve 103 and the inner surface 110 of the housing 101. During insertion of the cap assembly 102, the angled surface 111 contacts the distal end of the needle sleeve 103 and is moved outwardly from the central longitudinal axis of the device 100 toward the recessed region 122. Once the anti-recapping element 106 passes the distal end of the recess 117, the leg 107 returns to its original position and the anti-recapping element 106 is partially located within the recess 117 of the needle sleeve 103. The cap assembly 102 may then be moved proximally relative to the housing 101 until the shoulder 125 of the cap assembly 102 contacts the distal end of the housing 101, as shown in FIG. 21b.

[0120] 20c and 21c, the medication delivery device 100 is shown in an anti-recapping position after use. Refitting of the cap assembly 102 onto the housing 101 is similar to that described with reference to Figs. 20b and 21b. However, in this position, the locking element 114 of the needle sleeve 103 engages the locking element 116 of the housing 101 to prevent, or at least limit, further proximal movement of the needle sleeve 103 relative to the housing 101.

[0121] Thus, as the anti-recapping element 106 is moved proximally, the angled surface 111 of the anti-recapping element 106 contacts the proximal end of the recess 117 of the needle sleeve 103. As a result, the anti-recapping element 106 is moved outwardly from the central longitudinal axis of the device 100 toward the recessed region 122 until the anti-recapping surface 108 contacts the abutment surface 109 at the proximal end of the recessed region 122, preventing further proximal movement of the cap assembly 102. In this position, as shown in FIG. 21c, there is a gap between the shoulder 125 of the cap assembly 102 and the distal end of the housing 101, indicating that the device 100 has been used.

[0122] The terms "drug" and "pharmaceutical agent" are used interchangeably herein and refer to one or more Described herein is a pharmaceutical formulation comprising one or more active pharmaceutical ingredients or their pharma- ceutically acceptable salts or solvates, and optionally a pharma- ceutically acceptable carrier. An active pharmaceutical ingredient ("API") is, in its broadest sense, a chemical structure that has a biological effect on humans or animals. In pharmacology, drugs or medicines are used to treat, cure, prevent, or diagnose diseases or otherwise improve physical or mental well-being. Drugs or medicines can be used for a limited duration or periodically for chronic disorders.

[0123] As described below, drugs or agents may include at least one API or combinations thereof in various types of formulations for the treatment of one or more diseases. Examples of APIs may include small molecules with molecular weights of 500 Da or less, polypeptides, peptides, and proteins (e.g., hormones, growth factors, antibodies, antibody fragments, and enzymes), carbohydrates and polysaccharides, as well as nucleic acids, double-stranded 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 drugs are also contemplated.

[0124] The drug or agent can be contained in a primary package or "drug container" adapted for use in a drug delivery device. The drug container can be, for example, a cartridge, syringe, reservoir, or other rigid or flexible vessel configured to provide a chamber suitable for storage (e.g., short-term or long-term storage) of one or more drugs. For example, in some cases, the chamber can be designed to store the drug for at least one day (e.g., from one day to at least 30 days). In some cases, the chamber can be designed to store the drug for about one month to about two years. Storage can be at room temperature (e.g., about 20° C.) or at refrigerated temperatures (e.g., from about −4° C. to about 4° C.). In some cases, the drug container can be or include a dual-chamber cartridge configured to separately store two or more components of a pharmaceutical formulation to be administered (e.g., an API and a diluent, or two different drugs), one in each chamber. In such cases, the two chambers of the dual-chamber cartridge can be configured to allow mixing between two or more components prior to and / or during administration to the human or animal body. For example, the two chambers can be configured to be in fluid communication with each other (e.g., via a conduit between the two chambers) and to allow mixing of the two components by a user, if desired, prior to administration. Alternatively or additionally, the two chambers can be configured to allow mixing upon administration of the components to the human or animal body.

[0125] The drugs or agents contained in the drug delivery devices described herein can be used for the treatment and / or prevention of many different types of medical disorders. Examples of disorders include, for example, diabetes or complications associated with diabetes, such as diabetic retinopathy, thromboembolic disorders, such as deep vein thromboembolism or pulmonary thromboembolism. Further examples of disorders are acute coronary syndromes (ACS), angina, myocardial infarction, cancer, macular degeneration, inflammation, hay fever, atherosclerosis and / or rheumatoid arthritis. Examples of APIs and drugs are those found in handbooks such as Rote Liste 2014 (e.g., but not limited to, main groups 12 (antidiabetic agents) or 86 (oncology agents)) and the Merck Index, 15th edition.

[0126] Examples of APIs for the treatment and / or prevention of type 1 or type 2 diabetes or complications associated with type 1 or type 2 diabetes include insulin, e.g., human insulin, or a human insulin analog or derivative, glucagon-like peptide (GLP-1), GL P-1 analogs or GLP-1 receptor agonists include analogs or derivatives thereof, dipeptidyl peptidase-4 (DPP4) inhibitors, or pharma- ceutically acceptable salts or solvates thereof, or any mixture thereof. As used herein, the terms "analog" and "derivative" refer to a polypeptide having a molecular structure that is formally derivable from the structure of a naturally occurring peptide, such as the structure of human insulin, by deletion and / or replacement of at least one amino acid residue present in the naturally occurring peptide and / or by addition of at least one amino acid residue. The added and / or replaced amino acid residues can be either codable amino acid residues or other naturally occurring residues or purely synthetic amino acid residues. Insulin analogs are also referred to as "insulin receptor ligands". In particular, the term "derivative" refers to a polypeptide having a molecular structure that is formally derivable from the structure of a naturally occurring peptide, such as the molecular structure of human insulin, with one or more organic substituents (e.g., fatty acids) attached to one or more of the amino acids. Optionally, one or more amino acids present in the naturally occurring peptide are deleted and / or replaced by other amino acids, including non-codeable amino acids, or amino acids, including non-codeable ones, are added to the naturally occurring peptide.

[0127] Examples of insulin analogues are Gly(A21), Arg(B31), Arg(B32) human insulin (insulin glargine); Lys(B3), Glu(B29) human insulin (insulin glulisine); Lys(B28), Pro(B29) human insulin (insulin lispro); Asp(B28) human insulin (insulin aspart); human insulin in which the proline in position B28 may be replaced by Asp, Lys, Leu, Val or Ala and in which the Lys in position B29 may be replaced by Pro; Ala(B26) human insulin; Des(B28-B30) human insulin; Des(B27) human insulin and Des(B30) human insulin.

[0128] Examples of insulin derivatives are e.g. B29-N-myristoyl-des(B30) human insulin, Lys(B29)(N-tetradecanoyl)-des(B30) human insulin (insulin detemir, Levemir®); 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-omega-carboxypentadecanoyl-gamma-L-glutamyl-des(B30) human insulin (insulin degludec, Tresiba®); 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.

[0129] Examples of GLP-1, GLP-1 analogs and GLP-1 receptor agonists include, for example, lixisenatide (Lyxumia®), exenatide (exendin-4, Byetta®, Bydureon®, a 39 amino acid peptide produced by the salivary glands of the flathead monster), liraglutide (Victoza®), semaglutide, taspoglutide, albiglutide (Syncria®), dulaglutide (Trulicity®), rExendin-4, CJC-1134-PC, PB-1023, TTP-054, langrenatide / HM-1 1260C, CM-3, GLP-1 Erigen, ORMD-0901, NN-9924, NN-9926, NN-9927, Nodexene, 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.

[0130] An example of an oligonucleotide is, for example, mipomersen sodium (Kynamro®), a cholesterol-lowering antisense therapeutic for the treatment of familial hypercholesterolemia.

[0131] Examples of DPP4 inhibitors are vidagliptin, sitagliptin, denagliptin, saxagliptin, berberine.

[0132] Examples of hormones include pituitary or hypothalamic hormones or regulatory active peptides and their antagonists, such as gonadotropins (follitropin, lutropin, chorion gonadotropin, menotropin), somatropine (somatropin), desmopressin, terlipressin, gonadorelin, triptorelin, leuprorelin, buserelin, nafarelin, and goserelin.

[0133] Examples of polysaccharides include glycosaminoglycans, hyaluronic acid, heparin, low molecular weight heparin or very low molecular weight heparin or derivatives thereof, or sulfated polysaccharides, such as the above-mentioned polysaccharides in polysulfated form, and / or their pharma- ceutically acceptable salts. An example of a pharma-ceutically acceptable salt of polysulfated low molecular weight heparin is enoxaparin sodium. An example of a hyaluronic acid derivative is Hylan G-F20 (Synvisc®), sodium hyaluronate.

[0134] The term "antibody" as used herein refers to an immunoglobulin molecule or an antigen-binding portion thereof. Examples of antigen-binding portions of an immunoglobulin molecule include F(ab) and F(ab')2 fragments that retain the ability to bind to an antigen. An antibody can be a polyclonal antibody, a monoclonal antibody, a recombinant antibody, a chimeric antibody, a deimmunized or humanized antibody, a fully human antibody, a non-human (e.g., murine) antibody, or a single chain antibody. In some embodiments, an antibody has effector function and is capable of fixing complement. In some embodiments, an antibody has reduced or no binding ability to Fc receptors. For example, an antibody can be an isotype or subtype, an antibody fragment, or a mutant that does not support binding to Fc receptors, e.g., with a mutation or deletion of the Fc receptor binding region. The term antibody also includes antigen-binding molecules based on tetravalent bispecific tandem immunoglobulins (TBTI) and / or dual variable region antibody-like binding proteins (CODV) with crossover binding region orientation.

[0135] The term "fragment" or "antibody fragment" refers to a polypeptide (e.g., antibody heavy and / or light chain polypeptides) derived from an antibody polypeptide molecule that does not include the full-length antibody polypeptide but comprises at least a portion of the full-length antibody polypeptide that is still capable of binding to an antigen. Antibody fragments can include truncated portions of a full-length antibody polypeptide, but the term is not limited to such truncated fragments. Antibody fragments 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, tetraspecific and multispecific antibodies (e.g., diabodies, triabodies, tetrabodies), monovalent or multivalent antibody fragments, and the like. Antigen-binding antibody fragments include, for example, bivalent, trivalent, tetravalent and multivalent antibodies, minibodies, chelating recombinant antibodies, tribodies or vibodies, intrabodies, nanobodies, small modular immunopharmaceuticals (SMIPs), binding domain immunoglobulin fusion proteins, camelized antibodies, and VHH-containing antibodies. Additional examples of antigen-binding antibody fragments are known in the art.

[0136] The term "complementarity determining region" or "CDR" refers to short polypeptide sequences in the variable regions 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 in the variable regions of both heavy and light chain polypeptides that are not CDR sequences and are primarily responsible for maintaining the proper arrangement of the CDR sequences to allow antigen binding. Although the framework region itself typically does not directly participate in antigen binding, as is known in the art, certain residues in the framework region of a particular antibody may be directly involved in antigen binding or may affect the ability of one or more amino acids in the CDR to interact with the antigen.

[0137] Exemplary antibodies are anti-PCSK-9 mAb (eg, alirocumab), anti-IL-6 mAb (eg, sarilumab), and anti-IL-4 mAb (eg, dupilumab).

[0138] Pharmaceutically acceptable salts of any of the APIs described herein are contemplated for use in the drug or medicament in the drug delivery device. Pharmaceutically acceptable salts include, for example, acid addition salts and base salts.

[0139] Those skilled in the art will understand that modifications (addition and / or removal) of the various components of the APIs, formulas, apparatus, methods, systems, and embodiments described herein may be made without departing from the full scope and spirit of the present disclosure, and that the present disclosure includes such modifications and all equivalents thereof.

Claims

1. A cap (102) for a medication delivery device having an integrally formed cap body (104) and a cap lid (105), the cap lid (105) configured to be removably attached to a housing (101) of the medication delivery device (100) in a ready-to-use position; wherein the cap body (104) is configured to receive a needle sleeve (103) of the drug delivery device (100) through a proximal end of the cap body (104) when the cap (102) is attached to the drug delivery device (100) in its ready-to-use position, said needle sleeve being configured to be moved proximally during use to expose a needle; the cap body (104) includes an anti-re-capping element (106) configured to prevent the cap (102) from being reattached to the housing (101) of the medication delivery device (100) after the cap (102) has been removed and the medication delivery device (100) has been used; The cap (102) includes a proximally extending leg (107) and is configured to engage with the needle sleeve (103) of the drug delivery device (100) to prevent the cap (102) from being fully reattached to the housing (101) of the drug delivery device (100) when an attempt is made to recap the drug delivery device (100) after the drug delivery device (100) has been used.

2. The cap (102) of claim 1, wherein the leg (107) is elastically deformable.

3. The cap (102) of claim 1 or 2, wherein the anti-recapping element (106) is located at a proximal end of the leg (107).

4. The cap (102) of any one of claims 1 to 3, wherein the anti-recapping element (106) comprises an anti-recapping surface (108) configured to engage an abutment surface (109) of the inner surface (110) of the housing (101).

5. The anti-recapping element (106) prevents a user from removing the cap from the home appliance after the device (100) has been used. The cap (102) of any one of claims 1 to 4, further comprising an inclined surface (111) configured to move an anti-recapping element (106) at a proximal end of the leg (107) outwardly relative to a central longitudinal axis of the device (100) upon an attempt to reposition the cap (102) on the housing (101).

6. The cap (102) of any one of claims 1 to 5, wherein the cap (102) has a plurality of legs (107), each leg (107) having an anti-recapping element (106) at a proximal end thereof.

7. The cap (102) of any one of claims 1 to 6, wherein the cap body (104) is configured to be at least partially received within a housing (101) of the medication delivery device (100).

8. A cap (102) as claimed in any one of claims 1 to 7, wherein the cap body (104) includes a shoulder (125) formed between distal and proximal sections of the cap body, the shoulder being configured to abut a distal end of the main body of the medication delivery device (100) when in a ready-to-use position.

9. A subassembly for a drug delivery device (100): a housing (101) having a proximal and a distal end and including a first locking element (116) and a recessed area (122); A cap (102) according to any one of claims 1 to 8; a needle sleeve (103) configured to be at least partially received within the housing and to be moved proximally during use to expose the needle, the needle sleeve (103) including a second locking element (114) and a recess (117); wherein, when the subassembly is in a ready-to-use position, the cap body (104) is attached to the distal end of the housing (101) and the anti-recapping element (106) is received in the recess (117); said subassembly, after the cap (102) is removed from the housing and the subassembly is in its post-use position, the needle sleeve (103) is in the post-use position, the second locking element (114) is moved to a locking position in which the second locking element (114) is engageable with the first locking element (116) to at least limit the distance the needle sleeve (103) may be moved proximally relative to the housing (101) during a reattachment attempt, and the anti-recapping element (106) is receivable in a recessed area (122) of the housing (101) to prevent the cap (102) from being fully attached to the housing (101) after the needle sleeve (103) is in its post-use position.

10. The subassembly of claim 9, which recites claim 5, wherein when the subassembly is in a post-use position, proximal movement of the anti-recapping element (106) causes the inclined surface (111) of the anti-recapping element (106) to contact the proximal end of the recess (117) of the needle sleeve (103), and the anti-recapping element (106) is urged outwardly from the central longitudinal axis of the device (100) toward the recessed area (122) of the housing (101).

11. When the subassembly is in the post-use position and the anti-recapping element (106) is received in the recessed area (122) of the housing (101), the anti-recapping surface (108) of the anti-recapping element (106) comes into contact with the abutment surface (109) at the proximal end of the recessed area (122) when the anti-recapping element (106) is urged proximally against the recessed area (122) to prevent further proximal movement of the cap (102). A subassembly according to claim 9 or 10.

12. 12. The subassembly of claim 11, wherein a gap is provided between the cap (102) and the distal end of the housing (101) when the anti-recapping surface (108) of the anti-recapping element (106) contacts the abutment surface (109) at the proximal end of the recessed area (122).

13. A drug delivery device (100) comprising a housing (101), a syringe having a needle at one end, a needle sleeve (103), and a cap (102) according to any one of claims 1 to 8.

14. The drug delivery device (100) of claim 13, wherein the syringe contains a drug.

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