Apparatus for detecting a dose of medication delivered from an injection device - Patent application

Abstract

Disclosed is an apparatus for detecting a dose of a medication delivered from an injection device having a dose setting mechanism that allows different doses to be delivered from the injection device. Specifically, the accessory has an attachment portion configured to attach the accessory to the injection device and a body that houses an optical sensor device, and the injection device includes a cartridge assembly and a housing, the housing including a dose dispensing mechanism and a dose setting mechanism, the dose dispensing mechanism including a member that moves in response to movement of the dose setting mechanism and indicates the dose dialed by the dose setting mechanism. The housing further includes a window aligned with the member of the dose dispensing mechanism, and the attachment portion is configured to align the optical sensor device with the window to enable the optical sensor device to detect the position of the member that moves in response to movement of the dose setting mechanism to determine the dose dialed by the dose setting mechanism.

Description

[Technical field]

[0001] The present disclosure relates to an apparatus for detecting the dose of medication delivered from an injection device having a dose setting mechanism that allows different doses to be delivered from the injection device. [Background technology]

[0002] There are various diseases that require periodic treatment by injection of medication. Typically, a physician will develop a dosing regimen governing the timing and dosage of injections that a patient must follow. Thus, the timing and / or dosage of injections may vary between patients and between injections. Often, as part of the dosing regimen, the user is required to record parameters of the injection, for example to monitor the effectiveness of the treatment or as feedback during calculation of parameters for the next injection. This can be achieved by keeping a manual data log.

[0003] Injections can be performed by medical personnel or by the patient themselves by using an injection device. Typically, an injection device (i.e., a device capable of delivering a medication from a pharmaceutical container) has a syringe coupled to a medication container and a dose dispensing mechanism that drives the medication through a needle. The medication chamber can be reusable, and the dose dispensing mechanism is designed to be reset, allowing an empty medication cartridge to be replaced by a new one. Alternatively, the injection device can be disposable, and when the contents of the filled medication container are emptied, the injection device is disposed of. In some examples, the injection device includes a dose setting mechanism that allows the user to set or "dial in" the amount of medication to be administered.

[0004] As an example, type 1 and type 2 diabetes are treated by the patient themselves by injection of insulin doses according to a regimen, for example, once or several times a day. US Pat. No. 5,999,333 discloses a suitable injection device, typically called a pen, and references to pens herein are interchangeable with injection device. Disposable pens are known to include a set of one-way needles that are attached to the pen before each use. The dose of insulin to be injected and prescribed by the regimen can then be manually selected via a dose setting mechanism, for example, by turning a dose knob to the required volume. This dose is then injected by inserting the needle into the appropriate skin area and pressing an injection button on a dose dispensing mechanism. As part of the administration of the regimen, the user records the parameters of the injection. Such parameters are, for example, one or more of the date and time of injection, blood glucose results, medication and dose, and / or dietary and exercise information. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO2004 / 078241 Summary of the Invention [Means for solving the problem]

[0006] According to various aspects herein, an accessory for an injection device is provided that optically monitors the displacement of a member of a dose dispensing mechanism of the injection device. By monitoring the displacement of a member of the dose dispensing mechanism, the accessory can detect the amount of drug delivered that is drawn directly from the drive mechanism and not from the displacement of a bung (also called a stopper or plug) in the drug cartridge. This takes advantage of the fact that due to bending of components of the injection device due to forces and due to variations (within allowed tolerances) in the size and shape of components in the drive mechanism and cartridge, there may be some discrepancy between the dose indicated as delivered by the movement of the stopper and the dose indicated as delivered by the movement of the drive mechanism. For systems in which the displacement of the stopper is used to detect the amount of drug delivered, the determined amount of drug may not match the amount the user sets in the device for delivery, and the user may be concerned or even alarmed by the discrepancy between the dose the user thought he was dispensing and the delivered dose he was informed of. For example, the user may be concerned that the intended dose was not set correctly. The user may erroneously believe that they dispensed too much drug. The user may mistakenly believe that they have under-dosed and may erroneously decide to take a top-up dose.

[0007] In an exemplary embodiment, the accessory includes a body housing an optical sensor device. The body houses the optical sensor device such that it views through a window in the body, such that in use the optical sensor device faces a member of an injection device to which the accessory is attached. The optical sensor device faces a part of the injection device and is able to view a member of the dose dispensing mechanism. When the dose dispensing mechanism is provided adjacent to a drug chamber to act on a bung, the displacement of the member of the dose dispensing mechanism can be viewed through a window in the injection device without being viewed through the drug chamber. That is, by viewing the displacement through a window in a part of the dose dispensing mechanism, the optical properties can be more easily controlled.

[0008] Preferably, the body houses the optical sensor device such that a sensing face of the optical sensor device is arranged substantially parallel to the displacement movement of a member of the dose dispensing mechanism being monitored, such that the optical sensor device views the member perpendicular to the movement.

[0009] In some examples, the optical sensor device includes an image sensor, where the image sensor is arranged to capture an image. The image sensor can include a photodetector and a lens assembly that provides suitable optical properties of the image sensor, e.g., provides suitable field of view, focal length, aberration control, etc., as known in the art. In an exemplary embodiment, the optical sensor device has a field of view that corresponds to a range of movement of a Last Dose Nut (LDN) of the dose dispensing mechanism. Advantageously, since the accessory is specifically adapted to monitor the displacement of a member of the dose dispensing mechanism of the injection device, e.g., the LDN, the field of view of the optical sensor device can be reduced in contrast to when the optical sensor device was monitoring the movement of another member of the injection device, e.g., the stopper of the drug chamber, which typically has a larger range of movement.

[0010] In some examples, the optical sensor device includes a light emitter such as an illumination unit. The illumination unit is specified to improve the illumination conditions of the optical sensor device. Here, the illumination unit is arranged to illuminate a portion of the injection device, preferably a portion corresponding to at least the field of view of the optical sensor device during operation. That is, preferably, the illumination unit is arranged to illuminate substantially the range of displacement movement of a member of the dose dispensing mechanism of the injection device being monitored. In an exemplary embodiment, the displacement monitoring of the dose dispensing mechanism is monitoring the displacement movement of a last dose nut (LDN), and suitably the light emitter illuminates a portion of the optical sensor device corresponding to the range of movement of the LDN. As the field of view of the optical sensor device is reduced compared to monitoring the movement of the bung, the requirements for the illumination unit are reduced.

[0011] The accessories are adapted to measure the displacement of a member of the respective dose dispensing mechanism. In an exemplary embodiment, the measurements are calculated from a comparison of a first image recording the dose dispensing mechanism before the injection, i.e. before the dose dispensing mechanism is actuated to perform the injection, to a second image recording the dose dispensing mechanism after the injection. In an exemplary embodiment, the images record the movement of said member of the dose dispensing mechanism relative to another member. Said member is suitable to be arranged to move in response to the actuation of the dose setting mechanism. For example, said member can rotate relative to another member of the dose dispensing mechanism when the dose setting mechanism is actuated. In examples such as these, the members can include cooperating threads, said relative rotation causing one of the members to advance along the corresponding thread. When the dose dispensing mechanism is actuated, there is no relative movement between said member being monitored and the other member of the dose dispensing mechanism. In one exemplary embodiment, said member being monitored is a fill level indicator and the other member is a sleeve.

[0012] According to exemplary embodiments and further aspects, therefore, a device is provided that includes an accessory, an injection device, and a processor for image processing. The processor can be integral with the accessory, e.g., housed in the body, or the processor can be remote from the accessory. In exemplary embodiments where the processor is remote to the accessory, the accessory includes a communication module that sends images to a remote device, such as a smartphone, tablet computer, smartwatch, or other independent device (e.g., laptop or PC). In some exemplary embodiments, the accessory includes a controller that controls the optical sensor device to complete various image acquisition steps. The controller can also control the communication module that transmits the acquired images to the remote device for image processing. Thus, the main electronic processing is completed by the remote device, utilizing the electronics of the remote device, which do not then need to be replicated on the accessory. A power source provides power to the optical sensor device, the controller, or the communication module, as needed. In some examples, the power source is housed in the body of the accessory.

[0013] In an exemplary embodiment, the processor completes an image processing step that calculates the displacement of a member of the dose dispensing mechanism. The member is configured to move along the shaft of the dose dispensing mechanism in response to the operation of the dose setting mechanism. For example, the member is engaged to the shaft via a corresponding thread, and the member advances along the thread by rotation of the dose setting mechanism. When the dose dispensing mechanism is activated, the member is configured to not move relative to the shaft. In an exemplary embodiment, the measurement is the displacement of a last dose nut (LDN) along a drive sleeve (DS). Here, the injection device is configured to move the LDN along the drive sleeve corresponding to the movement of the dose setting mechanism. Typically, the LDN has a restricted movement along the DS, so that the dose setting mechanism cannot be dialed a dose that exceeds the remaining volume of the drug in the cartridge, until an end stop corresponding to the maximum dose volume (e.g., an empty cartridge) is reached. After the dose dispensing mechanism is activated and a dose is injected, the LDN remains in a position relative to the DS before a further dose is set by the dose setting mechanism. The processor can calculate the displacement between the LDN and a reference for each image. The displacement is calculated as the difference in the position of the LDN between the images. The processor can then calculate the dose volume of drug that the dose dispensing mechanism is configured to dispense. The calculation can include additional factors such as the thread pitch and diameter characteristics of the DS, or related characteristics of the dose dispensing mechanism.

[0014] Preferably, the processor calculates the displacement of the member of the dose dispensing mechanism relative to a reference. The reference can be a gauge formed in a window or a distinctive mark on the body or other component of the injection device. However, the reference may also be a mark or an edge of another member of the dose dispensing mechanism. For example, in an exemplary embodiment, the dispensing mechanism includes a nut that is threaded onto a shaft, the monitored member is the nut and a portion of the shaft is the reference. In one embodiment, the nut is a last dose nut and the shaft is a drive sleeve. The processor can apply an edge recognition algorithm to the process to identify one or both of the reference edge and the edge of the monitored member. Additionally or alternatively, one or both of the monitored member or the reference can be provided with a high definition color (e.g., by material selection or by treatment) relative to the other member in the viewing portion of the optical sensor device.

[0015] Preferably, the processor calculates the displacement by evaluating the number of pixels in the image, i.e., by comparing the number of pixels between the LDN and the reference in the first image with the number of pixels between the LDN and the reference in the second image after injection, where the number of pixels is counted in a straight line between the member and the reference, where the straight line may be along the axial direction of the injection device.

[0016] In an exemplary embodiment, the processor calculates the displacement. The processor can convert the displacement to a dialed dose measurement. The processor can cause the dialed dose measurement to be transmitted to the accessory, where the accessory includes a communication module that receives the dialed dose measurement. The controller can control the communication module, and the controller can control the communication module to transmit the received dialed dose to a display, where the display is housed in a body of the accessory. The display can be positioned to face the user and opposite the optical sensor device. A power source is provided to power the display, the controller, and the communication module. The display can also display other information received by the communication module, such as the time or dose of the next injection. Additionally or alternatively, the processor can transmit the dialed dose measurement for storage in an electronic logbook. For example, the processor can communicate with an electronic logbook program or the like, or the processor can process the image as part of an integrated electronic logbook program.

[0017] In some exemplary embodiments, the accessory includes one or more switches. The switches can communicate with the controller to initiate when to record an image and when to transmit the image to a remote device via the communication module. The switches are manually operated to indicate an event before or after an injection is performed. Alternatively, the one or more switches are automatically activated to indicate one or more of the events in the injection process. For example, the switches are automatically activated to indicate removal of a cap from an injection device or operation of a dose dispensing mechanism or a dose setting mechanism.

[0018] In an exemplary embodiment that includes a controller, the controller may include a memory that stores one or more images received from the optical sensor device.

[0019] In an exemplary embodiment including a communication module, the communication module may be a wireless communication module. Preferably, the wireless communication module is a short-range communication module. The method of operation may include a user completing a pairing process to pair the communication module with a remote device to establish a one-way or two-way communication scheme.

[0020] In an exemplary embodiment, the accessory includes an attachment part. The attachment part allows attachment of the accessory to the injection device, where the attachment part restricts relative movement between the accessory and the injection device in at least one direction. Advantageously, the restricted movement allows the accessory to be physically attached to and held on the injection device, while also facilitating positioning of the optical sensor device in the required position. The attachment part can be separate from the accessory or integral to the body of the attachment part. Thus, in some examples, the attachment part is attachable and detachable to the injection device, which allows the attachment part to be usable on multiple injection devices. This is particularly useful when the multiple injection devices are disposable injection devices, since the resource of the accessory can be reused across multiple devices. In some examples, the attachment part is formed as an integral member of the injection device, and the body of the accessory can be the body of the injection device. The integral arrangement may be useful for reusable injection devices.

[0021] Axial is a direction along the axis of the injection device, e.g., coaxial with the axis of the syringe, or in the direction of movement of the bung of the drug chamber. The attachment part can be arranged to engage the injection device by attachment through a relative movement between the accessory and the respective injection device in the axial direction, referred to herein as an engagement movement. The engagement movement can be axial in a proximal-distal direction or a reverse distal-proximal direction, where the proximal-distal direction is from the dose dispensing mechanism towards the cartridge, and the distal-proximal direction is the opposite, from the cartridge towards the dose dispensing mechanism. In an exemplary embodiment, the attachment part restricts the relative movement between the accessory and the injection device in a direction opposite to the engagement movement. In an exemplary embodiment, abutment between the attachment part and the injection device results in the restriction of the movement.

[0022] In embodiments involving a linear engagement movement in one axial direction, the attachment part and the injection device can be arranged to engage at a tapered portion, where at least one of the respective members is tapered such that the members are engaged cooperatively by friction. In one embodiment, the attachment part is tapered, where the tapered portion of the attachment part includes a first area forming opposed points spaced apart around the pen and a second area having opposed points spaced apart around the pen, the distance between the points of the first area being smaller than the distance between the points of the second area. Thus, the restricted movement is provided by friction generated by the force applied by the engagement movement. Additionally or alternatively, the injection device is tapered at the coupling area adapted to receive the accessory.

[0023] In further or alternative embodiments involving a linear engagement movement, the attachment part and the injection device can be arranged to provide a positive position. For example, one of the injection device or the attachment part includes a resilient part over which the other member is arranged. Here, the resilient part provides a localized restriction on the separation distance between the members. The engagement movement and the pushing of the two members together as each member moves over the resilient part provides a positive position that provides feedback to the user that the attachment of the accessory is complete. It is the direction of the disengagement movement that also provides an initial resistance to removal of the accessory in the opposite direction.

[0024] In some embodiments, the attachment part can include a positioning device for positioning the accessory on the injection device. The positioning device can provide a rotation key to align the accessory and the injection pen in rotational alignment with respect to the axial direction, and the key can prevent rotational movement of the accessory relative to the injection device when attached via a linear engagement movement along the axial direction. Here, the attachment part and the injection device are arranged to have cooperating alignment features. The cooperating alignment features can include asymmetric cross-sections with respect to the axial direction or can include protrusions and recesses on the respective members. The positioning device helps to align the optical sensor device and the members of the dose dispensing mechanism being monitored.

[0025] The engagement movement can include a relative movement between the accessory and the injection device in a further or alternative direction. For example, the engagement movement can include a rotational movement about an axial direction. Thus, the attachment part can engage the injection device by a twisting movement, the attachment part and the injection device including respective cooperating features, where the cooperating features are adapted to cooperate during the engagement movement, the attachment part restricting relative movement in both distal-proximal and proximal-distal axial directions. The cooperating features can also be engaged to restrict rotational movement in one direction. For example, the attachment part and the injection device can include cooperating screw threads, or cooperating bayonet features, or the like.

[0026] The radial direction is a direction along the axis of the injection device, e.g. a direction coaxial with the axis of the syringe, or a direction transverse to the direction of movement of the bung of the drug chamber (transverse to the axial direction). The attachment part can be arranged to engage the injection device by attachment through a relative movement between the accessory and the respective injection device in the radial direction, referred to herein as an engagement movement. For example, the attachment part and the injection device can include a pair of cooperating recesses and protrusions that act as a push button fit. Or alternatively, the attachment part is arranged to partially surround the injection device, the attachment part being resilient and acting as a clip around the injection device. Here, further alignment features can be provided to aid in the rotational alignment of the optical sensor device and the monitored member.

[0027] In an exemplary embodiment, the attachment portion engages the injection device at a midpoint of the injection device. Thus, when attached, the injection device extends from either side of the accessory body. This allows the cap to be placed and removed from the injection device without requiring removal of the accessory. Thus, the accessory can remain attached to the injection device during operation of the injection device.

[0028] The body of the accessory may include an attachment part and a functional part, where the functional part houses the optical sensor device and an optional display. The functional part may extend away from the attachment part in the axial direction of the injection device. The functional part may simply cover a part of the surface of the injection device around the radial face. Thus, the accessory may be attached without covering the whole of an information label fixed around the injection device.

[0029] In one exemplary embodiment, the attachment portion includes a ring that is adapted to fit and surround the injection device.

[0030] In an exemplary embodiment, the accessory is adapted to attach to an injection device that is a pen-type device. The pen includes a drug chamber, a dose dispensing mechanism, and a dose setting mechanism. In some examples, the dose dispensing mechanism and the dose setting mechanism are assembled in a housing, where the housing can provide a connection to attach the drug chamber or the drug chamber can also be assembled in the housing. A window is formed in the housing. The window is located relative to the dose dispensing mechanism and to expose the member of the dose dispensing mechanism being monitored. The window is optically transmissible so that an optical sensor device can monitor the respective member. In some embodiments, the window is a recess formed through the housing. Here, the window can be left open or can be closed by an optically transmissible member. Alternatively, at least one area of ​​the housing is formed to be optically transmissible, for example, the housing is formed from an optically transmissible material. In some exemplary embodiments, the housing is covered by an information label. The information label can include a removable section to expose the window. For example, the label can be formed with an area defined by perforations, and a user can remove the area defined by the perforations prior to attaching the accessory.

[0031] In an exemplary embodiment, the injection device includes a housing, the housing providing a receiver for receiving an attachment portion of the accessory. The receiver cooperates with the attachment portion to position and secure the accessory to the injection device. The window can be located adjacent to the attachment portion or can be spaced apart from the attachment portion. The attachment portion can include a positioning device to correspond to the positioning device of the accessory to aid in aligning the accessory with the window. In some examples, the receiver can be provided adjacent to the medication chamber or can be a connection between the housing and the medication chamber.

[0032] According to one exemplary aspect, there is therefore provided an apparatus including an accessory and an injection device. The accessory includes a body housing an optical sensor device. The body defines an attachment portion for mounting the accessory to the injection device. The injection device includes a cartridge assembly assembled to a housing. The housing includes a dose dispensing mechanism and a dose setting mechanism. The dose dispensing mechanism includes a member that moves relative to a datum in response to movement of the dose setting mechanism. The housing includes a window aligned with said member of the dose dispensing mechanism. Here, the attachment portion is specifically adapted to align the optical sensor device with the window. The accessory and the injection device can also be provided as a kit of parts or individually for use with each other.

[0033] According to a further aspect there is provided a method of administering a dosage regimen comprising optically monitoring displacement of a member of an injection device and electronically logging the results as part of a dosage regimen, the method further comprising attaching an accessory of the previous aspect to the injection device to form an apparatus of the previous aspect.

[0034] The method can include operably connecting an attachment part of the accessory to a receiver of the injection device. The step of operably connecting the attachment part and the receiver includes moving the attachment part relative to the injection device. The step of operably connecting the accessory aligns an optical sensor device with a viewing window in the injection device such that the optical sensor device can view movement of a member of the dose dispensing mechanism being monitored. The step of operably connecting the attachment part can include aligning and engaging a key on the accessory with a key on the injection device to rotationally align the optical sensor device and the window about an axis of the injection device.

[0035] In some examples, the method includes removing and replacing a cap of the injection device before and after injection, in such examples, the arrangement of the attachment portion facilitates removing and replacing the cap while the accessory remains attached to the injection device.

[0036] Prior to attaching the accessory to the injection device, the method may include removing an area of ​​the information label covering the housing of the injection device. The label removal step may include removing a portion of the label, for example by tearing off via a perforation provided in the label to reveal a window.

[0037] The method may include a pairing step of pairing the accessory with the remote device, for example, by pairing a communication module in the accessory with a corresponding module in the remote device. Pairing may be initiated by operating a switch or the like on the accessory.

[0038] In an exemplary method, the pre-injection image acquisition step includes operating the optical sensor device to capture an image of a position of a member of the dose dispensing mechanism. And the post-injection image acquisition step includes operating the optical sensor device to capture a second image of a position of a member of the dose dispensing mechanism. In some examples, the images capture the position of the member relative to a reference. The pre-injection image acquisition step and the post-injection image acquisition step can be initiated by operating a switch on the accessory. The switch can be operated manually or automatically upon different events. The image acquisition step can also include operating an illumination unit to illuminate the viewing area. The acquisition step can include causing the communication module to transmit the image to a remote device. The image can be transmitted after completion of the injection or at each stage throughout the injection.

[0039] In an exemplary embodiment, the method includes post-processing the images to calculate the displacement of a member of the dose dispensing mechanism. This post-processing can be completed by a processor of the remote device. This processing can include calculating the number of pixels between the fiducial and the member in the pre-injection image and calculating the number of pixels between the fiducial and the member in the post-injection image. The processing can include comparing the difference in pixel counts between the images to determine the displacement of the member. The pixel counts can define a line along the axis of the injection device and can define a line from the fiducial and the edge midpoint of the member. The processing can also include converting the displacement into a measurement of the dialed dose.

[0040] Preferably, the processor that processes the steps is part of the remote device, where an exemplary embodiment includes transmitting the pre-injection and post-injection images to the processor, where the transmission can be completed by a communication module of the accessory, where the communication module can also pair with the remote device to receive the transmission. For example, the accessory can include a display, where the method includes controlling the accessory to operate the display to display the information received from the remote device.

[0041] In an exemplary embodiment, the method includes logging the dose dialing calculation as part of an electronic logbook for recording the measured value of the dialed dose. The electronic logbook may also log injection details such as the time of injection based on the time of receipt by one or other processor of the image.

[0042] According to an exemplary embodiment, the method includes repeating the step of logging the dialed dose measurement for the next injection. The method further includes removing the accessory from the first injection device and reattaching the accessory to the second injection device. For example, when the first injection device is empty, the accessory is removed and replaced on a second replacement injection device with the medication remaining therein.

[0043] According to an exemplary embodiment, there is therefore provided an improved accessory for an injection device, an apparatus including the accessory and one or more injection devices, and a method for managing a dosing regimen, as set forth in the appended claims. Other configurations of the present disclosure will become apparent from the description and elsewhere in this application. By using the accessory to monitor the movement of the members of the dose dispensing mechanism, the dialed-in dose measurement can be electronically recorded as part of the dose management method. The accessory can also convert the injection device to be able to electronically capture the dialed-in dose measurement with limited changes to the injection device. By monitoring the members of the dose dispensing mechanism, it is possible to provide controlled visibility characteristics. Furthermore, by monitoring the LDN of the dose dispensing mechanism, the field of view of the optical sensor device is smaller than the stroke length of the bung in the drug chamber.

[0044] Exemplary embodiments are described with reference to the accompanying drawings. [Brief description of the drawings]

[0045] [Figure 1] FIG. 1 is a schematic diagram of an injection device. [Diagram 2] FIG. 2 is an exploded view of the injection device of FIG. 1. [Diagram 3] FIG. 3 is a partial cross-sectional view through the grip end of the assembled injection device shown in FIG. 2. [Figure 4] FIG. 13 is a perspective view of an alternative injection device. [Diagram 5] FIG. 13 is a perspective view of an alternative injection device. [Figure 6] FIG. 2 is a perspective view of an accessory for an injection device. [Figure 7] FIG. 1 is a perspective view of an apparatus including an injection pen and an accessory attached thereto. [Figure 8] FIG. 6 is a partial perspective view of FIG. 5 showing details with a member cut away. [Figure 9]4A-4D illustrate the movement of the last dose nut along the drive sleeve of the injection device shown in FIGS. 1-3. [Figure 10] FIG. 2 is a schematic diagram of a control layout. [Figure 11] A method for managing a dosing regimen. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

[0047] 1 is an exploded view of an injection device 200 suitable for use with an exemplary embodiment. The illustrated injection device is often referred to as an injection pen or pen. While various designs of pens are known, a brief description is provided herein, and it will be understood that the particular configuration of the pen can be varied and modified from the detailed description that follows.

[0048] The injection device 200 has a distal end and a proximal end. The term "distal" refers to a position relatively closer to the site of injection and the term "proximal" refers to a position relatively further away from the injection site.

[0049] The injection device 200 includes a grip assembly 202, a cap 203, and a needle assembly 204. The grip assembly is formed from a housing 210 and a cartridge assembly 220. The cartridge assembly 220 includes a cartridge holder 222 for containing a cartridge 224 containing a medicament. As shown, the housing 210 is generally cylindrical and has a generally constant diameter along its longitudinal axis from the proximal end to the distal end. The longitudinal axis has a proximal-distal direction extending from the proximal end to the distal end, and an opposite distal-proximal direction. A label 211 is provided on the housing 210. The label includes information about the medicament contained within the injection device 200, including information identifying the medicament. The information identifying the medicament can be in the form of text. The information identifying the medicament can also be in the form of a color. The information identifying the medicament can also be encoded in a bar code, a QR code, or the like. The information identifying the medicament can also be in the form of a black and white pattern, a color pattern, or a shaded area.

[0050] The cartridge assembly 220 is assembled to the housing 210 to form the grip assembly 202. In some examples, the proximal end of the cartridge assembly 220 includes a coupling member and the distal end of the housing 210 includes a corresponding coupling member that cooperatively engages with one another to couple the two members. As shown, the cartridge holder 222 is generally cylindrical with a hollow center that receives the cartridge 224. The cartridge includes a stopper 228 that is advanceable within the cartridge 224 to expel the medicament from the cartridge during use. It should be understood that the needle assembly 204 cooperates with the grip assembly to act as a conduit for the medicament during injection.

[0051] The cartridge holder 222 has a round window 226 on its side. The round window 226 allows a user to see the cartridge 224 through the round window 226 when the cartridge 224 is contained in the cartridge holder 222. FIG. 1 shows the stopper 228 of the cartridge 224 visible through the round window 226. Although FIG. 1 shows the cartridge holder 222 with one round window 226, the cartridge holder 222 can alternatively have two or more windows 107. For example, the cartridge holder 222 can have a first round window 226 located on one side of the cartridge holder 222 and, in some cases, a second round window located on a second side of the cartridge holder 222. Thus, a first side of the cartridge 224 in the cartridge holder 222 can be seen through the first round window 226, while a second, different side of the cartridge 224 can be seen through the second round window. Other round window configurations may be used.

[0052] Shown is a needle assembly including a needle 206, an inner needle cap 207, and an outer needle cap 208. The needle 206 of the needle assembly 204 can be secured to the cartridge holder 104 such that the needle 106 is in fluid communication with the medicament in the cartridge 224. The needle is protected by the inner needle cap 207 and the outer needle cap 208.

[0053] A removable cap 203 is attached to the cartridge assembly. When attached to the grip assembly, the cap 203 at least partially covers the cartridge holder 222, and thus the cartridge 224. The cap 203 can also be attached to the grip assembly such that it at least partially covers the cartridge holder 222 when one or more of the needle 106, inner needle cap 108, or outer needle cap 110 are or are not present.

[0054] The cartridge holder 222 can have a cap retention feature 223 on an outer surface, for example, adjacent a proximal end of the cartridge holder 222 and adjacent the attachment of the housing 210. Thus, the cap 203 can substantially cover the cartridge assembly when fitted. The cap retention feature 223 engages with a corresponding mating feature on an inner surface of the cap 203 to hold the cap 203 in place when attached to the grip assembly. The cap retention feature 223 can include one or more of ridges, grooves, bumps, locks, and / or pips. In some examples, the cap retention feature is located on the housing 210 of the injection device 200.

[0055] As shown in FIG. 2, the housing 210 houses a dose dispensing mechanism and a dose selection mechanism. The dose setting mechanism is used to select the dose to be injected, and the dose dispensing mechanism is activated to inject the dose. In this example, the dose dispensing mechanism is activated to drive a stopper towards the distal end of the cartridge 224. The injection device 200 can be used for several injection processes until either the cartridge is empty or the expiration date of the injection device 200 is reached (e.g., 28 days after the first use). The injection device 200 can be disposable or reusable.

[0056] To drive the stopper 228 into the cartridge 224, the dose dispensing mechanism includes a piston rod 232, a drive sleeve 234, and a trigger button 236, which work together to drive a pressure plate 237 against the stopper 228 and into the cartridge 224. The drug or drug dose to be injected from the drug delivery device 200 is selected by turning a dose knob 242, which is connected to a dose dial sleeve 244 by a threaded insert 243, and rotation of the dose dial sleeve 244 by the dose knob 242 causes the selected dose to be displayed in a dose window 212 in the housing 210 and causes a clicker 250 to interact with the drive sleeve 234 via a spring clutch 252. Together, the dose knob 203, the dose dial sleeve 230, and the clicker 250 are a dose setting mechanism. The dose dial sleeve 244 is disposed around a clicker 250 which includes a feedback mechanism 251 that generates tactile and audible feedback with rotation of the dose dial sleeve 244. The clicker 250 is coupled to the drive sleeve 234 with a metal clutch spring 252.

[0057] A last dose nut 260 (LDN) is provided on the drive sleeve 234. The last dose nut 260 advances with each dose dispensing operation to track all the drug remaining in the cartridge 224. The trigger button 236 is depressed to activate the dose dispensing operation of the drug delivery device 100. The drive sleeve 234 includes flanges 262 and 264 protruding from the drive sleeve. For example, the flanges can be radial flanges. The LDN 260 is a threaded member and in some examples can be a half nut. The drive sleeve typically includes a threaded bolt section extending between the two flanges. When the drive sleeve is rotated by a corresponding rotation of the dose setting mechanism, the LDN 260 is moved along the drive sleeve by the cooperation of the respective threads. The LDN can be positioned to move from the flange 162, which is the smallest flange where the LDN abuts against the flange and indicates the starting position of the LDN when the cartridge is full. The LDN moves repetitively along the LDN as each dose is injected. The LDN abuts against another flange, which is the largest flange that prevents the LDN from moving and, therefore, prevents the dose dialing mechanism from dialing a dose beyond the dose remaining in the cartridge.

[0058] As discussed above, while the dose setting mechanism is shown as a dose knob 242, a dose dial sleeve 244, and a clicker 250, one skilled in the art will appreciate that any number of different dose setting mechanisms are means in the art for setting a dose of a drug delivery device, and that aspects of the present disclosure are compatible with other such dose setting mechanisms. Similarly, while the dose dispensing mechanism is illustrated as including a piston rod 232, a drive sleeve 234, and a trigger button 236, one skilled in the art will appreciate that a number of different dose dispensing mechanisms (e.g., drive mechanisms) are known in the art for delivering or dispensing a dose of a drug delivery device, and that aspects of the present disclosure are compatible with other such dose dispensing mechanisms.

[0059] Continuing with the operation of the drug delivery device 200, turning the dose knob 236 causes a mechanical click sound and provides audio feedback to the user by rotating the dose dial sleeve 244 relative to the clicker 250. The numbers displayed on the dose display 212 are printed on the dose dial sleeve 244, which is contained within the housing 210 and mechanically interacts with the drive sleeve 234 via a metal spring clutch 252. When the injection button 236 is pressed, the drug dose displayed on the display 212 is released from the drug delivery device 100. During the dose setting operation, the drive sleeve 234 spirals together with the dose dial sleeve 244, which spirals outward in a distal-proximal direction. When the injection button 236 is pressed, the drive sleeve 234 is released and advances distally, thereby causing the piston rod 232 to rotate. Rotation of the piston rod 232 drives a pressure plate 237 against a stopper 228 of the cartridge 224, thereby driving the stopper 228 into the cartridge 224 and expelling the drug from the cartridge 224. A more detailed description of an exemplary drug delivery device is provided in U.S. Patent No. 7,935,088 (B2), issued May 3, 2011.

[0060] 3 shows the drug delivery device 100 before a dose dispensing operation at the end of a dose setting operation, where the dose dial sleeve 244 and the drive sleeve 234 are helically rotated relative to the housing 210 and the threaded end 233 of the piston rod 232 to set a dose. The last dose nut 260 is shown advancing along the drive sleeve 234 from an initial position to a position indicating the dose remaining in the drug delivery device 100. Upon dispensing a dose on the injection button 236, the drive sleeve 234 advances into the housing 210 and the bearing nut 214 causes the piston rod 232 to rotate. The bearing nut 214 is fixed inside the housing 210 and is in threaded engagement with the piston rod 232. As the piston rod 232 rotates, the piston rod 232 is threaded forward (relative to the housing 210) since the bearing nut 214 cannot move. Rotation of the piston rod 232 drives the piston rod 232 and pressure plate 237 proximally in a proximal-distal direction to drive the stopper 228 into the cartridge 224. When dispensed, the drive sleeve is in the undialed dose position.

[0061] The drug dose to be released from the injection device 100 can be selected by turning the dose knob 242, and the selected dose is then displayed, for example in multiples of International Units (IU), via the dose window 212. An example of the selected dose displayed in the dose window 212 can be "30" IU, as shown in Figure 1. It should be noted that the selected dose can also be displayed separately as well, for example using an electronic display.

[0062] Turning the dose knob 242 produces a mechanical click sound to provide audio feedback to the user. The numbers displayed in the dose window 212 are printed on a sleeve 244 contained within the housing 210. When the needle 206 is inserted into a portion of the patient's skin and the inject button 236 is then pressed, the drug dose displayed in the display window 212 is expelled from the injection device 100. When the needle 206 of the injection device 100 remains in the skin portion for a period of time after the inject button 236 is pressed, a high percentage of the dose is actually injected into the patient's body. The expulsion of the drug dose also produces a mechanical click sound, however, this is different from the sound produced when using the dose knob.

[0063] Although a pen injection device is briefly described in this disclosure, other injection devices are envisioned, as are known in the art.

[0064] In an exemplary embodiment, referring to FIG. 4, a window 270 is provided in the housing 210. The window is formed in a distal end of the housing 210. The window is formed in a portion of the housing that corresponds to a portion of the housing that houses a member of the dose dispensing mechanism, the movement of which is monitored. The window is shown adjacent to a connection that connects the housing 210 and the cartridge assembly 220. The window 270 can be spaced from the proximal end of the housing such that the window is bounded by the housing 210, or the window can be aligned with the proximal end such that one side of the window is open.

[0065] The window 270 is arranged to be optically transmissive so that an optical sensor device can see through the window 270 to monitor the displacement of the member of the dose dispensing mechanism being monitored. Thus, the window 270 can be an open aperture through the housing. Alternatively, the window 270 can be an aperture through the housing that is filled with an optically transmissive member, for example an aperture filled with a mirror. The window is sized to correspond to the range of movement of the member being monitored. In an embodiment where the housing is cylindrical, the window can extend around the member at the circumference of the housing 210. For example, the window 270 can subtend a circumferential arc. The arc can subtend an angle of more than 10°, or more than 20°, or more than 30°, or more than 45°. The arc can subtend an angle of less than 120°, or less than 110°, or less than 00°, or less than 90°. When monitoring displacement of the LDN in the axial direction of the housing 210, the window 270 can extend substantially between the positions of the minimum flange 262 and the maximum flange 264 of the drive sleeve 234 when the drive sleeve 234 is in an undialed dose position.

[0066] In an alternative embodiment, the window 270 is created by forming the housing 210 or the proximal end of the housing from an optically transmissive material, where the window 270 extends around the entire circumference of the housing 210. The window extends axially within at least the corresponding range of motion of the member being monitored, i.e., between the minimum and maximum flanges 262, 264 when monitoring the motion of the LDN 260.

[0067] In Figure 4, the label 211 affixed to the housing is shown as not being formed in the window 270. Referring to Figure 5, a label can be affixed to the housing to cover the window and the area of ​​the label covering the window removed prior to attachment of the accessory to digitally monitor displacement, where the label includes perforations along which the label can be torn or cut or folded to be removed from the window area.

[0068] 6, there is shown an accessory 100. The accessory is adapted to be attached to an injection device 200. The accessory 100 includes a body defining an attachment portion 110 and a functional portion 120.

[0069] The attachment portion is arranged to allow the accessory to be attached to the injection device 200. The attachment portion 110 is shown in FIG. 6 as a collar adapted to position around the injection device 200. The collar is a substantially closed ring having an inner diameter. Here, the collar is sized to have an appropriate inner diameter to fit the distal end of the cartridge assembly. It is larger than the size of the distal end of the cartridge. Thus, the accessory 100 can be attached to the injection device 200 by relative lateral movement of the accessory and the injection device along the longitudinal axis of the injection pen and in the distal-proximal direction. The accessory engages with the injection device by friction or alternatively by clipping or elastic deformation of the respective members against the accessory or injection pen.

[0070] In FIG. 7, the attachment 100 is shown attached to an injection device 200. The attachment portion 110 is shown engaged with a receiver of the injection device. The receiver is shown adjacent to the connection between the cartridge assembly and the housing 210. The receiver can be part of the cartridge, e.g., a proximal portion at the proximal end, or part of the housing, e.g., a distal portion at the distal end. In an exemplary embodiment, the receiver is not covered by the cap 203 when the cap 203 is attached. In FIGS. 6 and 7, the accessory is shown engaged with the injection device by a friction fit between the attachment portion and the receiver, e.g., by appropriate sizing and tapering of the inside of the attachment portion and the outside of the receiver.

[0071] The functional part extends away from the attachment part and along the axis of the intended injection pen. The functional part 120 houses an optical sensor arrangement 130. The optical sensor arrangement 130 is an electronic device that monitors the displacement of a member of the dose dispensing mechanism, for example by recording digital images of the position of the member at two or more stages of the injection process. Here, the optical sensor arrangement includes an image sensor 132, for example an array of photodetectors such as a CCD or CMOS detector, that converts the optical image into a digital signal as part of the image acquisition process, as known in the art. The array of photodetectors can be a one-dimensional array, for example an array along the longitudinal axis, or the array can be a two-dimensional array in both the circumferential and longitudinal axes. An illumination unit 134 can be provided as part of the optical sensor arrangement 130, for example one or more light emitting elements, such as an LED array and as known in the art, that provide consistent illumination characteristics for image acquisition.

[0072] The optical sensor device 130 is positioned on the functional part 120 such that when attached to the functional part 120, it faces the window 270 of the injection device. The attachment part extends away from the functional part to surround the injection device, and the optical sensor device is positioned to be pointed in the same direction. For example, if the attachment part 110 extends from the underside of the functional part 120, the optical sensor device is positioned on the underside of the functional part. Here, the underside of the functional part can include an aperture and the optical sensor device 130 is pointed through the aperture. The aperture can be open or filled with an optically transmissive material.

[0073] An optional display 140 is housed in the body of the accessory, for example, on the top (or user-facing) side of the functional portion. The display 140 can be an electronic ink display module, which requires power to change the display, but can display images (such as text) for some time without power. As described in connection with FIG. 10, the body can house further electronic modules, such as a controller, a power supply, a communication module, and a memory. The body can also provide one or more switches that can be manually operated to control one or more of the image acquisition and processing functions.

[0074] With reference to FIG. 8 , the accessory 100 is aligned with a window 270 of an injection device, which is aligned accordingly with a member of a dose dispensing mechanism being monitored. As described herein, a member of a dose dispensing mechanism being monitored is a member that moves relative to another member to indicate a dose dialed by a dose setting mechanism. In an exemplary embodiment, the member being monitored is the LDN 260, whose relative movement is along the sleeve 234. As described above, the LDN 260 moves between the minimum flange 262 and the maximum flange 264 when a dose is dialed into the dose setting mechanism. When the dose dispensing mechanism is triggered, for example by pressing the trigger 236, the LDN does not move along the sleeve. Rather, the LDN remains stationary relative to the sleeve during dispensing. Thus, the member moves along the sleeve during dose setting, and translates with the sleeve as the sleeve translates to drive the stopper into the drug cartridge. Thus, the member moves in steps toward the maximum flange, with each step representing a dispensing movement. When the maximum flange 264 is reached, the LDN prevents further doses from being dialed into the dose setting mechanism. The maximum flange indicates that the LDN has moved along the sleeve which indicates the maximum drug in the cartridge (i.e. the cartridge is empty or will be empty if a dose has been dispensed). The LDN indicates the level of drug remaining in the drug cartridge or it can also be called a fill level indicator if the dose dialed in by the dose setting mechanism is injected.

[0075] In the described embodiment, the sleeve moves axially in a distal-proximal direction when a dose is dialed into the dose setting mechanism, but after injection, the sleeve returns to the same position in the housing. The window is therefore positioned to align with this position and the respective image recorded when the sleeve is in a non-dose dialed position. The measurement of the dialed dose can be calculated as the displacement of the LDN along the sleeve. As described above, a member moved along the sleeve by the operation of the dose setting mechanism. Typically, the LDN member rotates relative to the sleeve, and the movement is driven by cooperating threads between the member and the sleeve. The pre-injection image can be compared to the post-injection image to calculate the displacement of the LDN as the member moved along the sleeve by the operation of the dose setting mechanism. As shown in FIG. 9, the position of the LDN 260 per image can be calculated from a fiducial. The fiducial can be a gauge formed on the injection device, such as a mark or edge of the sleeve. For example, the fiducial can be an edge of the minimum or maximum flange 262, 264.

[0076] As shown in FIG. 9, the top image represents the image before injection and the bottom image represents the image after injection, where the dialed dose measurement is calculated by determining the displacement of the LDN 260 by taking the distance between the LDN 260 and the reference after injection away from that same measurement before injection. An image processing process calculates the measurement. For example, the image processing process calculates the displacement by looking up the number of pixels between the reference and the LDN 260 for each image. Here, an edge detection algorithm can be applied to determine the respective edges. The components where edges are detected can be colored differently than other components to aid in edge detection. For example, the LDN 260 and flanges can be darker in color compared to other components and vice versa. As long as there is a high enough contrast between the color of one component and the color of the components adjacent to and behind it (to the sensor), the edge can be reliably detected and its position can be reliably measured.

[0077] Cooperative positioning devices may be provided to obtain correct alignment of the accessory and the injection device so as to align the optical sensor arrangement 130 with the window 270, in particular to ensure rotational alignment of the respective accessory and injection device.

[0078] As shown in FIG. 10, the controller 150 controls the image acquisition process of the image sensor 130. A memory 160 may be provided as needed. The controller aligns an optional display to display the image. The accessory may include a processing module to complete the image processing process, but preferably the accessory includes a communication module to send the acquired image to a remote device for image processing. Here, the communication module may be any suitable wireless communication module, such as Bluetooth, Wi-Fi, IRDA, NFC module, or other short-range or medium-range communication module. A switch 180 may be provided on the housing of the accessory to be operated manually and to control the controller. For example, the switch 180 may be used to control the controller to establish a connection with a remote device via the communication module 170. The switch may also control the controller to acquire pre-injection or post-injection images via the image sensor. It should be understood that if the switch has alternative functions, the switch may be the same switch or multiple switches, each with its own function. Also, one or more of the switches may be operated automatically. For example, the switch may be arranged to detect placement or removal of a cap from the injection device, or the dosage of a dose dispensing mechanism, or operation of a dose setting mechanism, where the switch may be provided on the injection device where appropriate or required, and the attachment part and the receiving part may provide electrical contacts to electrically connect the two members.

[0079] A power supply 190 is provided in the accessory to provide power to each of the components.

[0080] 11, a method of managing a dosing regimen is shown. The method includes, in step S100, acquiring a pre-injection image. The pre-injection image records the position of the LDN 260 before the injection process is completed in step S200. Acquiring the pre-injection image can be triggered by operation of switch 180, or alternatively, a post-injection image of a previous injection is used or recalled from memory.

[0081] Step S200 includes completing the injection process, which includes using the dose setting mechanism to dial in the dose to be injected and activating the dose dispensing mechanism to dispense the medication.

[0082] In step S300, a post-injection image is captured. Again, the post-injection image is captured by the image sensor 130 and the controller is triggered to capture the image by the operation of a switch.

[0083] In step S400, the post-injection image and optionally the pre-injection image are sent to a remote device for image processing. In image processing step S500, the remote device processes the image and calculates a dialed-in dose measurement, which may be a calculation including the displacement of the LDN 260 and other parameters of the dose dispensing mechanism such as thread pitch and diameter. After the image processing step calculates the dialed-in dose measurement, the remote device may transmit the calculated measurement back to the communication module to be displayed by the display 140.

[0084] Alternatively, step S400 can be omitted and S500 can be performed by the accessory. In these embodiments, the calculated dose may or may not be transmitted to another device.

[0085] The user may use the calculated measurements displayed on the display 140 in a manual logbook. However, in an exemplary embodiment, the remote device includes a software application program for electronically logging the calculated dialed dose measurements, and possibly other injection parameters. For example, the dosage management is performed by a computer or the like, such as an application on a smartphone or tablet, which monitors the time and dosage of the injection and alerts the user to the time and dosage of the injection. The application may also be used to enter and record the injection parameters, for example, to automatically log the time and date of the injection.

[0086] According to the above, the accessory 100 can be attached to the injection device 200, and in doing so, the optical sensor device 130 on the accessory is aligned with the window 270 on the injection device. This can include engaging the receiver on the attachment part 110 and optionally aligning a member of the injection device with a member on the accessory. The injection is completed by the injection device 200 and the accessory 100 controlled to optically monitor the displacement of the LDN 260. The pre-injection and post-injection images are processed to calculate a dialed-in dose measurement, which is used for the dose regimen. By electronically logging or displaying the measurements for electronic logging, the dose regimen can be improved, for example, by improving the recording accuracy or automation of the dialed-in dose measurement.

[0087] The accessory is described herein as being attachable and detachable to the injection device. This is particularly useful for disposable injection devices, where for example the resources of the optical sensor device can be reused between multiple injection devices. However, it is also contemplated that the accessory can be formed as an integral part of the injection device. In some examples, the injection device is a reusable injection device. When integrally formed, the accessory can be configured to be permanently attached to the injection device, or, for example, the body of the accessory can be a common body of the injection device.

[0088] Although the claims have been summarized in this application to a particular combination of features, it is to be understood that the scope of the disclosure includes any novel features or any novel combination of features explicitly or implicitly disclosed herein, or any generalization thereof, whether or not it relates to the same disclosure as currently claimed in any claim, and whether or not it alleviates some or all of the same technical problems as the present disclosure does. Applicant hereby informs that new claims will be presented to such features and / or combinations of features during the prosecution of this application or any further applications derived therefrom.

[0089] While several embodiments have been shown and described, it will be understood by those skilled in the art that changes may be made in these embodiments without departing from the principles of the present disclosure, the scope of which is defined by the claims.

[0090] The terms "drug" or "medicament" are used interchangeably herein to describe a pharmaceutical formulation containing 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"), in its broadest sense, is 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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), a GLP-1 analog or GLP-1 receptor agonist, analog or derivative thereof, a dipeptidyl peptidase-4 (DPP4) inhibitor, or a pharma-ceutically acceptable salt or solvate 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, e.g., 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 residue can be either a codable amino acid residue or another naturally occurring residue or a purely synthetic amino acid residue. Insulin analogs are also referred to as "insulin receptor ligands". In particular, the term "derivative" refers to a polypeptide having a molecular structure formally derivable from the structure of a naturally occurring peptide, e.g., the molecular structure of human insulin in which one or more organic substituents (e.g., fatty acids) are 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.

[0095] 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.

[0096] 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.

[0097] Examples of GLP-1, GLP-1 analogs and GLP-1 receptor agonists are, 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-11260C (efpegrenatide). , HM-15211, CM-3, GLP-1 Erigen, ORMD-0901, NN-9423, NN-9709, 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, ZP -DI-70, TT-401 (Pegapamodtide), BHM-034, MOD-6030, CAM-2036, DA-15864, ARI-2651, ARI-2255, Tirzepatide (LY3298176), Bamadutide (SAR425899), Exenatide-XTEN and Glucagon-Xten.

[0098] Examples of oligonucleotides are, for example, the cholesterol-lowering antisense therapeutic mipomersen sodium (Kynamro®) for the treatment of familial hypercholesterolemia, or RG012 for the treatment of Alport Syndrome.

[0099] Examples of DPP4 inhibitors are linagliptin, vidagliptin, sitagliptin, denagliptin, saxagliptin, berberine.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] The term "fragment" or "antibody fragment" refers to a polypeptide (e.g., antibody heavy and / or light chain polypeptide) 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. An antibody fragment 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, such as bivalent, trivalent, tetravalent and multivalent antibodies, minibodies, chelating recombinant antibodies, tribodies or bibodies, 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.

[0104] 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.

[0105] Exemplary antibodies are anti-PCSK-9 mAb (eg, alirocumab), anti-IL-6 mAb (eg, sarilumab), and anti-IL-4 mAb (eg, dupilumab).

[0106] 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.

[0107] 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 of the disclosure, which encompasses such modifications and any and all equivalents thereof.

Claims

1. An apparatus comprising an accessory (100) and an injection device (200): The accessory (100) has an attachment portion (110) configured to attach the accessory (100) to the injection device (200) and a body housing an optical sensor device (130); The injection device (200) includes a cartridge assembly (220) and a housing (210); The housing includes a dose dispensing mechanism including a member (260), a dose setting mechanism, and a window (270) aligned with the member (260) of the dose dispensing mechanism; the member (260) moves in response to movement of the dose setting mechanism, and the position of the member (260) is used to determine the dose to be dialed by the dose setting mechanism; The attachment portion (110) is configured to align the optical sensor device (130) with a window (270) in the injection device (200) to enable the optical sensor device (130) to detect the position of a member (260) that moves in response to movement of a dose setting mechanism to determine the dose to be dialed by the dose setting mechanism.

2. The apparatus of claim 1 , wherein the optical sensor device (130) includes a sensor array configured to capture an image of the member (260).

3. The apparatus of claim 2 , wherein the sensor array is a one-dimensional array.

4. 4. The device of claim 2 or 3, wherein the accessory is configured to cause the sensor array to capture a first image of the member (260) before the injection begins.

5. 5. The device of claim 4, wherein the accessory is configured to cause the sensor array to also capture a second image of the member (260) after it is detected that the injection is complete.

6. The apparatus of claim 5 , wherein the accessory is configured to calculate a displacement of the member (260) using both the first and second images.

7. 7. The apparatus of claim 6, wherein the accessory is configured to calculate a displacement of the member (260) by detecting a position of an edge in the first and second images and by comparing the position of the edge between the first and second images.

8. The apparatus of any one of claims 2 to 5, wherein the accessory (100) includes a communication module (170), such as a wireless communication module, and is configured to use the communication module (170) to send images acquired by the optical sensor apparatus (130) to an external device for processing.

9. An apparatus as claimed in any one of claims 1 to 8, wherein the member (260) is a last dose nut (260) threadedly engaged with the drive member (234) of the dose setting mechanism, the last dose nut (260) being arranged to advance along the drive member (234) by threaded engagement and in response to operation of the dose setting mechanism.

10. The apparatus according to any one of claims 1 to 9, wherein the injection device (200) comprises a receiving portion for receiving the attachment portion, the receiving portion being not covered by the cap of the injection device when the cap is operably provided.

11. An accessory (100) comprising: an attachment portion (110) configured to attach the accessory (100) to an injection device (200) having a dose setting mechanism; a body housing an optical sensor device (130); wherein the attachment portion (110) is configured to align the optical sensor arrangement (130) with a window (270) in the injection device (200); the window is aligned with a member (260) that moves in response to movement of the dose setting mechanism; and The accessory, wherein the optical sensor device (130) is configured to detect the position of the member (260) to determine the dose dialed by the dose setting mechanism.

12. 12. The accessory (100) of claim 11, wherein the accessory includes a communications module (170) that transmits images acquired by the optical sensor arrangement (130) to a remote device for image processing.

13. An injection device (200) comprising: A cartridge assembly (220); a housing (210) containing a dose dispensing mechanism and a dose setting mechanism; wherein the dose dispensing mechanism includes a last dose nut (260) that moves in response to movement of the dose setting mechanism, the position of the last dose nut (260) being used to determine the dose to be dialed by the dose setting mechanism; The injection device, wherein the housing includes a window (270) aligned with the last dose nut (260).

14. The injection device (200) of claim 13, wherein the injection device includes a cap (203) that covers a member of the cartridge assembly when the injection device is operably connected, and the injection device includes a receiving portion that receives an attachment portion of the accessory, and the receiving portion is not covered by the cap when the cap is operably connected.

15. An injection device (200) according to claim 13 or 14, wherein the cartridge assembly (220) includes a cartridge (224) containing a medicament.

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