Electronic additional modules for injection devices

Abstract

The invention relates to an electronic additional module (2) for an injection device, the injection device having a longitudinal axis and an ejection button arranged at the proximal end of the injection device and movable in the distal direction along the longitudinal axis for ejecting a liquid drug from a container of the injection device. The additional module comprises a sensor unit, a receiving area (20a) matching the shape of the device housing of the injection device for being mounted on the injection device along the longitudinal axis, and a retaining mechanism, the retaining mechanism releasably retaining the mounted additional module to prevent axial movement relative to the injection device. The receiving area (20a) is constructed in such a way that the ejection button can be touched even when the additional module is mounted. The additional module comprises a release element, which can only move in a plane perpendicular to the longitudinal axis during a release movement for releasing the retaining mechanism.

Description

Technical Field

[0001] The present invention relates to the field of medical injection devices for administering liquid substances, in particular drugs or medicinal substances such as insulin and hormone preparations. The present invention relates to a portable electronic add-on module for being mounted on a medical injection device. Background Art

[0002] Different infusion and injection devices can assist the patient in administering a dose of a drug from a container in a controlled manner, subcutaneously or intramuscularly. In the case of an infusion system, the syringe remains in the patient's body for a longer period of time, and the injection device is removed from the injection site after each delivery. In a disposable injection device, the container, such as a finished injector, is not configured to be replaced or refilled by the patient. In contrast, in a reusable injection device, the container, such as a cannula (Karpule), can be refilled or replaced by the patient. An automatic injection device has a motor or a tensioned spring as an energy source for driving the piston rod and for moving the piston in the reservoir, while when ejecting with a manual injection device, the piston rod moves directly by the patient's force.

[0003] Diabetes is usually treated by outputting insulin in an adjustable dose with an injection device in the form of an insulin pen. The pen has an elongated housing with a distal end for accommodating a syringe or a hollow needle and a proximal end away from the injection site. The insulin pen can be operated automatically or manually as a disposable pen or a reusable pen. The insulin dose to be output is usually adjusted by rotating a dosing button and controlling the dose display of the insulin pen at the same time. In order to monitor insulin output in real time, for example, to prevent misoperation, or to track multiple outputs over a long period of time, information about the type of insulin, the dose size, and the time point of each dose output and other situations can be collected.

[0004] For this purpose, EP 3572107 A1 shows an electronic additional module which is laterally mounted on an injection device and can be fastened or clamped on the injection device by means of a snap-on connection. The snap-on mechanism comprises two elastic wings on the additional module which define a receiving area for the injection device. The additional module comprises sensors for detecting the state of the injection device and / or for monitoring the continuous ejection process.

[0005] WO 2007 / 107564 A1 describes an additional module for an injection device, the additional module having a dose adjustment button arranged on the proximal end of the injection device. Before or after using the injection device, the distal end of the injection device is protected by an instrument cover, which is engaged in the coupling element of the injection device and prevents the unintentional release in the distal direction. The additional module can be engaged in the coupling element after removing the instrument cover and prevents the proximal movement of the module. The additional module has its own coupling element again, which allows the matching instrument cover to be fastened to the additional module when the additional module is assembled.

[0006] WO 2018 / 036938 A1 shows an additional module which engages with a preloaded pin in a recess in the housing of an automatic injector and thereby prevents the additional module from axial movement. The engagement is released by rotating a button or a rod which extends beyond the proximal end face of the additional module and is guided by two fingers of the user, so that the additional module can be removed again. The automatic injector includes a trigger button which is completely surrounded or covered by the attached additional module, so that it can preferably be controlled indirectly or indirectly by the user in this case.

[0007] WO 2003 / 011373 A1 describes a modular injection device with a reusable dosing and manipulation module, which includes a counting and display device and a disposable reservoir module including a mechanical holder and a sleeve holder. The locking engagement is released in the radial direction by a locking element on the locking ring of the dosing and manipulation module in the groove of the mechanical holder by operating an unlocking button on the locking ring and overcoming a return spring. When the proximal actuating element moves to the maximum in the distal direction, the unlocking element allows this locking engagement to be released only at the end of the ejection movement. In order to completely move the reservoir module in and to lock it, the actuating element must be pressed against the spring axially supported on the housing of the dosing and manipulation module and the unlocking button must be pressed at the same time.

[0008] The term "drug" or "medical substance" in this context includes any flowable medical agent, such as a liquid, solution, gel or fine suspension containing one or more medically active ingredients, which is suitable for controlled administration by means of a syringe or a hollow needle. Thus, the drug can be a composition with only one active ingredient, or a premixed or co-formulated composition with multiple active ingredients from a single container. The term includes in particular pharmaceutical products, such as peptides (e.g. insulin, drugs containing insulin, containing GLP-1 and derivative or similar preparations), proteins and hormones, biologically obtained or effective active ingredients, hormone-based or gene-based active ingredients, nutritional preparations, enzymes and other substances, whether in solid (suspended) or liquid form. The term also includes polysaccharides, vaccines, DNS or RNS or oligonucleotides, antibodies or antibody parts, as well as suitable basic substances, auxiliary agents and carrier substances. Summary of the invention

[0009] The object of the present invention is to provide a reliable injection system consisting of an injection device and an additional module detachably fastened thereto, wherein the user can clearly distinguish between the actuation of an ejection mechanism for injecting a dose and the actuation of a release mechanism for releasing the additional module from the injection device. This object is achieved by an injection system having the features of the independent claim. Preferred embodiments of the invention are the subject matter of the dependent claims.

[0010] According to the present invention, an electronic additional module can be releasably mounted or pushed onto an injection device in the direction of a longitudinal axis, and the longitudinal axis connects the distal end of the injection device's piercing side with the opposite proximal end. The injection device includes an apparatus housing that surrounds an output mechanism for a drug from a container of an injection device for parenteral subcutaneous or intramuscular output. The injection device has an ejection button on its proximal end that can be moved by a user along the longitudinal axis of the injection device in a distal direction, thereby causing or triggering the ejection. The ejection button can be directly touched and manipulated by the user even when the additional module is mounted, and is not surrounded or covered by the additional module. The additional module includes a sensor unit for detecting a process or state in the injection device, and a processor unit for analyzing and / or processing a signal of the sensor unit. The additional module also includes an energy storage unit for powering the sensor unit and / or the processor unit, and a communication unit for wirelessly transmitting the signal of the sensor unit and / or the data of the processor unit.

[0011] The additional module has a retaining mechanism that at least retains the sensor unit of the mounted additional module to prevent axial movement relative to the injection device. The additional module includes a release element or a release control component that can be controlled by a user in a release movement for releasing the retaining mechanism and for releasing the additional module from the injection device. The release movement of the release element includes only a movement in a plane perpendicular to the longitudinal axis of the injection device or a linear movement in a direction at least approximately perpendicular to the longitudinal axis. The release movement is preferably a pure rotational movement around the longitudinal axis or a pure linear movement in a direction mainly perpendicular to the longitudinal axis, that is, with a minimum deviation of at most 25° or preferably at most 10° relative to the vertical axis, or further preferably without an axial movement component. The release movement does not particularly include a twisting movement in the longitudinal direction and a tilting of the rod around an axis different from the longitudinal axis. The release movement is the only operation performed by the user, and in particular does not require the release of the safety on the additional module or a specific state of the injection device. Since the release movement of the release element takes place at least approximately perpendicularly to the activation direction of the ejection button, the risk of confusing the two movements is minimized compared to injection systems in which both the ejection button and the release element are pressed or moved in the same direction.

[0012] The injection device itself does not have the ability to communicate with another device, but can be matched to interact with the additional module, for example, through a suitable opening in the device housing or through a movable actuator, such as a magnet or a sliding contact, whose position can be clearly identified by the sensor of the additional module. The injection device is preferably a disposable injection device that cannot replace the container by the user, or it is also a reusable injection device. The injection device is further preferably an injection device with variable dose adjustment, which includes a dose adjustment button arranged at the proximal end for adjusting the dose to be pushed out by means of a rotational motion and / or a spiral motion. The dose adjustment button can also be directly grasped and manipulated by the user in the case of the set additional module, and is therefore not surrounded by the additional module or covered in other ways. The injection device can also be provided for a disposable fixed dose. The injection device is either manually operated by transmitting the user's push-out force to the push-out button, or includes a preloaded spring, which is released by manipulating the push-out button so as to be pushed out automatically.

[0013] The additional module is usually configured as a sleeve and has a rigid receiving area with an opening for receiving the injection device that matches the cross section of the injection device, so that the injection device cannot be removed or even dropped from the receiving area transversely to the longitudinal axis in the packaged state. Without affecting the mutual orientation of the additional module and the injection device, the receiving area can have a lateral opening or a transparent window, through which a label (Etikette) on the device housing can be seen. The axial extension range of the additional module is selected so that the dose display window of the injection device for displaying the adjusted dose is not covered by the additional module installed and the dose display portion remains directly visible to the user. Accordingly, the sensor unit is not configured to read the displayed dose, but is based on an optical, mechanical or electrical, including magnetic or inductive recognition of a process or state in the injection device. Preferably, the sensor unit includes at least one uniaxial or multiaxial acceleration sensor, a uniaxial or multiaxial gyroscope sensor, an inertial sensor, a piezoelectric-based solid-state sound microphone or a similar sensor for detecting the movement of the injection device. These movements include movements of the injection device in space carried out by the user and movements of the injection device caused by mechanisms in the injection device, such as oscillations, vibrations or sound waves that eject the clip. To this end, in the assembled state, the boundary surface of the receiving area rests as closely as possible on the support surface of the injection device.

[0014] In a preferred embodiment, the release movement is a linear movement implemented by the user pressing or pushing the release element. In contrast to the rotational movement, this linear movement causes the orientation of the additional module relative to the user, which is clearly different from the rotationally symmetrical ejection button and further makes it difficult for the user to confuse.

[0015] In a preferred embodiment, the release element is arranged in the distal half of the additional module, preferably arranged on the distal end of the additional module. Thus, the release element is farthest from the push button, which additionally makes confusion difficult.

[0016] In a preferred embodiment, the release element is a part of the handle for grasping and guiding the additional module and the inserted injection device with one hand. The handle surrounds the accommodating area and has a width of at least half of the user's hand or an extension range of at least 3cm in the direction of the longitudinal axis. In the holding state, the surface of the release element protrudes beyond the surface of the module housing by at most 2 mm, preferably at most 1 mm, at the transition portion to the surface of the module housing, or drops by at most 2 mm, preferably at most 1 mm relative to the surface of the module housing. Therefore, the surface of the release element forms a continuation of the surface of the module housing of the additional module directly surrounding the release element in the set state, which is at least approximately weld-free and step-free. Here, the gripping surface or the control surface of the release element does not need to be completely flat or flat, and it can also be included in the edge when transitioning to the side of the module housing, but the rod or knob extending from the module housing is finally excluded as a release element. The handle is arranged or constructed so that when the handle is grasped in the first or injection handle position, the user grasps the part of the module housing and the surface of the release element with the first hand and touches them. In this grip position, all relevant operations can be performed with the injection system, such as inserting the needle at the injection site, inserting the needle and ejecting the needle by touching the ejection button with the thumb of the first hand. Other operations can be performed in the first grip position with the help of the second hand, such as removing the instrument cover, installing the injection needle and adjusting the dose. Since the user at least partially covers the release element with his hand in the first grip position, it is excluded that the user can manipulate the release element at the same time. In order to remove the additional module, the second or release grip position must be selected accordingly.

[0017] In a favorable variant of the present invention, the accommodating area is configured to accommodate the injection device by moving the injection device in the distal direction or by pushing the additional module onto the injection device in the proximal direction. For this purpose, the injection device includes a stop face or a stop face pointing to the distal end to limit the movement of the additional module to be mounted on the injection device in the proximal direction. Preferably, the stop face is formed in the transition between the distal sleeve holder of the injection device and the proximal device housing. Here, the dose selection button and optionally the dose display are also not touched or surrounded by the additional module on the proximal end of the injection device, so that the accommodating area does not have to be coordinated with the size of the dose selection button and the accommodating area can therefore have a larger extension range perpendicular to the longitudinal axis compared with the housing of the injection device.

[0018] In this variant, the injection device includes a holding surface pointing to the proximal end, which is formed at the embossing portion or the molding portion of the injection device and deviates radially or perpendicularly to the longitudinal axis from the surface of the device housing. The holding element of the holding mechanism of the additional module engages the holding surface from behind in the set state and forms a shape lock with the holding surface, so that the additional module is held or fixed to prevent the separation movement in the distal direction and can transfer the user's force to the injection device in the distal direction. The holding surface is a part of the embossing portion (such as a groove or a recess) in the surface of the device housing of the injection device, or a part of the molding portion (such as a flange or a rib). Preferably, the embossing portion is not a part of the dose display window of the injection device for displaying the adjusted dose, so that the dose display window is not covered by the additional module and the dose display portion remains directly visible to the user. Through the shape lock of the prescribed shape lock of the holding element, the additional module is locked on the injection device, and the force lock with the surface of the injection device or even the plastic deformation of the surface of the injection device caused by the claw on the additional module can not occur.

[0019] In a preferred improvement, the injection device comprises a sleeve holder for accommodating the distal end of the container and a device housing for accommodating the proximal end of the output mechanism, wherein the sleeve holder is reversibly releasable or permanently and irreleasably connected to the device housing after initially and once accommodating the container. These holding surfaces are formed by a molded portion and / or a stamped portion on the sleeve holder, so that only the sleeve holder needs to be replaced or matched for the changed holding surface, without having to replace or match the device housing and the output mechanism. Preferably, the molded portion on the sleeve holder is formed as a protrusion on a flange or a flange section, which protrudes beyond the adjacent surface of the device housing, wherein the flange also forms a stop surface. Preferably, the holding surface on the injection device is formed by a molded portion or a stamped portion, which is different from the protrusion of the injection device for fixing the device cover. The molded portion or the stamped portion is positioned in the axial direction so that the same device cover can be set with or without an additional module, and the protrusion for fixing the device cover is not used by the holding mechanism.

[0020] In an advantageous variant, the release element snaps or latches in a stable release position at the end of the release movement. Thus, the release element can be released again at the end of the release movement without thereby making a separation movement of the injection device and the additional module impossible, or making it possible to select other handle positions for the separation movement. The release element has two end positions, wherein the release position of the release element is visually distinct from the holding position, which provides the user with a first and lasting feedback of the holding state. As an alternative, the release element is preloaded into the holding position by a spring mechanism and must be actively held in the release position by the user at least at the beginning of the separation movement.

[0021] In a preferred improvement, when the injection device is moved in, the release element implements a holding movement or locking movement directed in the opposite direction to the release movement, wherein the holding element of the holding mechanism moves to engage with the holding surface and the additional module is locked with the injection device. The holding element and the release element are integrally formed or rigidly coupled at least in the direction of the holding / release movement. The release element moves from the release position to the holding position indirectly via the axial movement of the injection device through a deflection mechanism or through an unlocking drive element, without the need for the user to manipulate other locking elements. The release element also serves as a control component and a locking component.

[0022] In a preferred development, the holding mechanism comprises a control element which moves under the tension of a control spring when the injection device is inserted and thereby unlocks the release element for a holding movement from the release position into the holding position. The holding movement or locking movement preferably takes place automatically, for example by an unlocked drive element such as a return spring, whereby a clearly audible locking snap can be reproducibly generated as additional holding state feedback to the user.

[0023] In a preferred improvement, the or a first injection device has a molding or stamping portion, which is significantly different from the surface of the injection device surrounding the molding or stamping portion. The additional module has a groove corresponding to the molding portion in the boundary surface of the accommodating area, which is used to axially guide the molding or injection device when it is moved into the additional module, and / or has a retaining element corresponding to the stamping portion, which is used to be embedded in the stamping portion. The other or second injection device differs from the injection device only in the molding or stamping portion and the medical indication. The difference in the molding or stamping portion is caused, for example, by the number, arrangement and / or form of discrete moldings or recesses, based on the differences in active ingredients, formulations, durability, use, treatment and / or patients in medical indications, and the corresponding instructions on the label. The personalized molding or stamping portion can prevent the additional module from being intentionally or unintentionally mounted on other injection devices that are identical except for the difference.

[0024] In an advantageous variant, the additional module has a charging socket for connecting a charging cable in order to charge the electrical energy storage device of the additional module. The charging socket is arranged in such a way that it cannot be accessed by an inserted injection device, in particular the charging socket opens into the receiving area and is therefore directly covered by the injection device. The charging cable inserted into the charging socket is guided out of the receiving area through a lateral opening or window in the module housing, wherein the opening is preferably designed in such a way that at least a part of the label of the inserted injection device can be read through the opening.

[0025] In a preferred variant, the cannula holder and, if applicable, the injection needle of the injection device are covered or protected between two injection processes by a removable device cover. The additional module comprises an instrument cover detector for detecting the inserted instrument cover, the instrument cover detector having a tilting element (kippelement) with two legs starting from a rotation point, wherein the movement of the first leg end perpendicular to the longitudinal axis of the injection device is converted or transformed into an axial movement of the second leg end with a stroke corresponding to the wall thickness of the instrument cover. The movement of the second leg end and / or its end position is detected by a switch element that responds to the axial movement, from which it can be inferred that the instrument cover has been completely and correctly inserted.

[0026] In a preferred variant, the additional module includes an injection device detector for identifying the inserted injection device, the injection device detector having a switch element that is actuated by a release element in the locking movement and / or in the subsequent holding position. The release element is preferably a release button with an axially oriented rod and is preloaded in a radial direction perpendicular to the longitudinal axis by a return spring for the holding movement or locking movement. The retractable injection device, optionally via a linear or tilting movement of the control element, releases the locking movement, thereby keeping the injection device in the additional module, and the switch element can detect the movement of the release element and can infer that the injection device is completely and correctly retracted.

[0027] The object mentioned at the outset is also achieved by an additional module for an injection device, the injection device having a longitudinal axis and an ejection button arranged at the proximal end of the injection device and movable in the distal direction along the longitudinal axis, the ejection button being used to eject a liquid drug from a container of the injection device, wherein the additional module comprises a sensor unit, a receiving area adapted to the shape of a device housing of the injection device for being mounted on the injection device along the longitudinal axis, and a retaining mechanism which releasably retains the mounted additional module against axial movement relative to the injection device, wherein the receiving area is designed such that the ejection button can be touched even when the additional module is mounted, and wherein the additional module comprises a release element which can be moved only in a plane perpendicular to the longitudinal axis during a release movement for releasing the retaining mechanism. Preferably, the receiving area is designed for accommodating the injection device by pushing the injection device in the distal direction, wherein the injection device has a proximally directed retaining surface which engages from behind a retaining element of the retaining mechanism and retains the injection device against a proximally separated movement.

[0028] Another object of the present invention is to provide a reliable injection system consisting of an injection device and an additional module that is releasably fastened to the injection device, wherein the user cannot recharge the electrical energy storage device of the additional module during the injection process. This object is achieved by an additional module that has a sensor unit, a receiving area that is matched to the shape of the device housing of the injection device for being inserted onto the injection device, and a charging socket for connecting a charging cable for charging the energy storage device of the additional module, wherein the charging socket is arranged in such a way that it cannot be accessed by the inserted injection device. As a result, the otherwise mandatory certification for ensuring the safety of the user of the injection device from the mains voltage when the charging cable is inserted can be omitted. The charging socket opens in particular into the receiving area and is therefore directly covered by the injection device. Preferably, the additional module comprises a lateral opening or window in the module housing, which is not used for inserting the injection device and through which the charging cable inserted into the charging socket can be led out of the receiving area.

[0029] Another object of the present invention is to provide a reliable injection system consisting of an injection device and an additional module detachably fastened thereto, wherein the correct execution of a forced operation on the injection system can be displayed to the user. This object is achieved by an additional module having a sensor unit, a receiving area adapted to the shape of an instrument housing of the injection device for being inserted onto the injection device, the injection device having a longitudinal axis and a removable instrument cover for covering a cannula holder, and an instrument cover detector for detecting the inserted instrument cover, the instrument cover detector comprising a tilting element with two legs starting from a rotation point, wherein a movement of a first leg end perpendicular to the longitudinal axis of the injection device is converted or transformed into an axial movement of a second leg end with a stroke corresponding to the wall thickness of the instrument cover, and the instrument cover detector comprising a switch element for detecting the axial movement of the second leg end and / or its end position. Complete and correct insertion of the instrument cover is inferred from a corresponding signal of the actuated switch element, which can be displayed to the user in a suitable manner for operation and used, for example, to deactivate a communication unit.

[0030] Another object of the present invention is to provide a reliable injection system consisting of an injection device and an additional module releasably fastened thereto, wherein the correct implementation of a forced operation on the injection system can be displayed to the user. This object is achieved by an additional module, which has a sensor unit, a receiving area adapted to the shape of the device housing of the injection device for being inserted onto the injection device, and a release element, which is moved into a holding position by a locking movement, in which the release element releasably holds the inserted additional module against axial movement relative to the injection device, wherein the additional module includes an injection device detector for identifying the inserted injection device, the injection device detector having a switch element, which is actuated by the release element in the locking movement and / or in the holding position. The complete and correct insertion of the injection device is inferred from the corresponding signal of the actuated switch element, which can be displayed to the user in a suitable manner for operation and used to activate, for example, a communication unit.

[0031] In the above-mentioned solution, preferably the electronic additional module is releasably mounted or pushed onto the injection device in the direction of the longitudinal axis, and the longitudinal axis connects the distal end of the puncture side of the injection device with the opposite proximal end. Advantageously, the injection device includes an apparatus housing that surrounds a delivery mechanism for delivering a drug from a container of the injection device subcutaneously or intramuscularly for parenteral administration. For this reason, the injection device has an ejection button on its proximal end that can be moved by the user along the longitudinal axis of the injection device in the distal direction and thereby cause or trigger the ejection. The ejection button is directly touched and manipulated by the user even when the additional module is mounted, and is not surrounded or covered by the additional module. The additional module includes a sensor unit for detecting a process or state in the injection device, and a processor unit for analyzing and / or processing the signal of the sensor unit. The additional module also includes a rechargeable energy storage, such as a capsule battery, and a communication unit for wirelessly transmitting the signal of the sensor unit and / or the data of the processor unit for powering the sensor unit and / or the processor unit. The additional module preferably has a retaining mechanism that releasably retains the mounted additional module against axial movement at least relative to the injection device. For this purpose, the additional module comprises a release element or a release control component that can be actuated by the user in a release movement for releasing the retaining mechanism and for releasing the additional module from the injection device.

[0032] Further embodiments and configurations are directly and obviously apparent to a person skilled in the art, which result from a combination of the described examples or from a combination of the described examples with the general specialist knowledge of a person skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. These embodiments should reveal the basic feasible solutions of the present invention and should not be construed as limiting. It is shown in the drawings:

[0034] Figure 1 An injection device with a variable dose output is shown;

[0035] Figure 2 A first variant of an additional module with a sliding release element is shown;

[0036] Figure 3 A first embodiment with a first variant of a force-locking connection is shown;

[0037] Figure 4 Three injection devices with different molding or stamping parts are shown;

[0038] Figure 5 A second embodiment of the first variant with a form-fitting connection is shown;

[0039] Figure 6 A third embodiment of the first variant with a form-fitting connection is shown;

[0040] Figure 7 A second variant of an additional module with a rotary release element is shown;

[0041] Figure 8 A first embodiment with a second variant of a form-fitting connection is shown;

[0042] Fig. 9 A second embodiment with a second variant of a form-fitting connection is shown;

[0043] Fig.10 A third variant of an additional module with a push button is shown;

[0044] Fig.11 A first embodiment with a third variant of a force-locking connection is shown;

[0045] Fig.12 A second embodiment with a third variant of a form-fitting connection is shown;

[0046] Fig.13 A third embodiment with a third variant of a form-fitting connection is shown;

[0047] Fig.14 A fourth embodiment of the third variant with a form-fitting connection is shown;

[0048] Fig.15 A first implementation with a form fit relative to the shaped part is shown;

[0049] Fig.16 A second implementation with a form fit relative to the embossing is shown;

[0050] Fig.17 A fifth embodiment of the third variant with a form-fitting connection is shown;

[0051] Fig.18 Two partial longitudinal sections of a sixth embodiment of the third variant are shown;

[0052] Fig.19 A plurality of different configurations of the forming portion and the embossing portion are shown; and

[0053] Fig. 20 The add-on module is shown with an inserted charging cable. DETAILED DESCRIPTION

[0054] Figure 1 An injection device with variable dose output is shown in an oblique top view, which includes an elongated device housing 10 with a longitudinal axis, a cannula holder 11, a dose selection button 12, a dose display 13 and an ejection button 14. The cannula holder 11 has a cam 11a and an annular stop surface 11b at the transition to the device housing 10. The distal end ( Figure 1 The left side of the center) has a thread for applying a needle unit with an injection needle. The device protection cover or needle protection cover of the injection device (not shown) can be snap-connected with the projection 11a in a position covering the cannula holder 11. The possible extension of the support surface 10a on the upper side of the device housing is drawn in dashed lines. The label of the injection device can be applied to the device housing on the left side. Figure 1 On a lower side which is not visible in the drawing, the lower side is opposite the supporting surface.

[0055] Figure 2 A first variant of an additional module 2 according to the invention is shown in a view perpendicular to the longitudinal axis (left) and in a view in the direction of the longitudinal axis (right). The additional module comprises a sleeve-shaped module housing 20 with a receiving area 20a for receiving an injection device by moving it in the distal direction or by pushing the additional module in the proximal direction onto the injection device until it comes into contact with a stop surface 11b. Figure 1Injection device in. In the set state, the boundary surface of the accommodating area 20a is at least tightly against the supporting surface 10a. The additional module also includes a release element 21 configured as a slide, which can move upward in the direction of the arrow perpendicular to the longitudinal axis from the holding state to the release state shown. The release element 21 includes two lateral gripping surfaces 21a, each of which has five ribs, and the ribs have an extension range corresponding to the width of the finger in the direction of the longitudinal axis. As a result, the release element 21 can be grasped and pushed perpendicular to the longitudinal axis using the thumb and index finger of the hand. In the release state shown, the release element 21 protrudes beyond the module housing 20, and in the holding state, the release element and the module housing form a continuous surface without obvious steps or transitions, which is suitable as a handle for the user to grasp the additional module and the injection device.

[0056] Figure 3 In a cross section perpendicular to the longitudinal axis and in accordance with Figure 2 The first embodiment of the first variant is shown in plane AA of FIG. 1 , in which the additional module is fastened to the instrument housing 10 by force locking. The metal clip 22 is formed by a metal strip having a width that does not exceed the axial extension of the release element 21 and a length that is not less than the circumference of the instrument housing. The metal strip forms a loop with a 270° bend and two partially intersecting ends 22a, 22b, each of which has a width that is less than half the width of the strip and is offset in the axial direction. In the holding state ( Figure 3 The curved section (right in the center) lies tightly against the device housing 10 and the two ends 22a, 22b are preloaded by crossing the opposite preloading directions indicated by two arrows. A force lock with minimal static friction is produced between the device housing 10 and the curved section, optionally via a radially compressible section of the module housing 20. This prevents the additional module from being accidentally released against the insertion direction, as may be encountered in certain cases due to axial forces generated when inserting the needle guard or when applying the needle unit to the injection device.

[0057] In the released state ( Figure 3In the embodiment of the present invention, the two ends 22a, 22b of the metal strip move or open away from each other in the opposite direction of their respective prestressing direction, and the bent section of the metal strip does not lie so tightly against the instrument housing 10 when the force lock is released, so that the instrument housing can move relative to the additional module. The movement of the two ends 22a, 22b is controlled by the release wedge 21b of the release element 21, which is controlled in the longitudinal direction by the following tab, which separates the two ends upward in the direction of the arrow during the release movement. In the absence of the metal clip or in the case of other directional prestressing of the metal clip, the release element can also press the two ends together in the holding position. The clip can also have a plurality of turns consisting of strips of correspondingly smaller width or even made of metal wire.

[0058] Figure 4 Three injection devices are shown, which have different moldings or embossings on the cannula holder for the form-fitting fastening of the additional module. Figure 4 In the upper part, the shaped part 11c has the shape of four radial expansions, widenings or projections of the flange which are evenly distributed on the circumference and which simultaneously form the annular stop surface 11b. Figure 4 In the middle, the shaped part 11c has the shape of two lateral projections on the flange, which are arranged radially opposite to each other with respect to the longitudinal axis. The shaped part 11c projects beyond the surface of the instrument housing 10 and thus forms a proximally directed retaining surface for form-locking with the retaining element of the additional module to prevent the additional module from being accidentally released in the opposite direction of insertion. Figure 4 The upper central shaped part can include fewer than four and / or non-rotationally symmetrically arranged widening parts or can also be designed as a circumferential collar. Figure 4 The embossing 11d in the form of two parallel lateral grooves or slits on the sleeve holder is shown at the bottom. The two grooves are arranged adjacent to the flange in the distal direction and have a retaining surface extending inward and pointing to the proximal end relative to the surface of the sleeve holder 11, so as to be form-locked with the retaining element of the additional module. The molding and the embossing can also be constructed on the instrument housing, or on the more distal structure of the stop surface 11b on the sleeve holder. The matching additional module has a groove corresponding to the molding 11c in the receiving area 20a parallel to the longitudinal axis, and the groove extends almost over the entire length of the receiving area 20a for the molding on the flange. As a result, the injection device and the additional module are fixed to each other in a torsion-proof manner when they are set.

[0059] Figure 5 A second embodiment of the first variant is shown, which is different from the embodiment according to Figure 4 Two of the four shaped portions on the upper sleeve holder are form-fitting. Figure 5A section perpendicular to the longitudinal axis directly proximal to the flange is shown, wherein the module housing 20 is additionally divided into two halves in the axial direction. The release element comprises a radially displaceable holding element 21c, whose innermost edge in the holding state (right side) engages behind holding surfaces of two of the four shaped parts 11c and releases the holding surfaces in the contact state (left side) after a release movement in the direction of the arrow.

[0060] Figure 6 The third embodiment of the first variant is shown in an oblique top view at the top, which has a configuration corresponding to that according to Figure 4 The additional module 2 again has a release element 21 in the form of a slide. The module housing has a window 20c or an opening in the region of the label at the injection device, that is to say relative to the support surface. Figure 6 A longitudinal section through the embodiment in the released state is shown in the center. The radially movable release element 21 is preloaded downwards or inwards by a return spring 23, and the axially movable control element 24 is preloaded proximally by a control spring or ejection spring 25. The return spring and control spring are shown as pressure-loaded helical springs, but the preload of the release element and the control element can also be achieved by tension springs or other elastic elements.

[0061] Figure 6 The release element 21 is shown at the bottom with two parallel arms and a retaining element on each arm, wherein only the arm 21d facing the viewer is visible in the selected view. In the released state (bottom right), the locking cam 24a of the control element 24 engages in the recess 21e of the release element 21, so that despite the preload, the release element 21 is still locked against downward movement by the return spring 23. As soon as the injection device is introduced from the proximal direction and the control element 24 is pushed distally by the stop surface 11b or the shaped part 11c under the compression of the control spring 25, the locking cam 24a moves axially out of the recess 21e and releases the release element 21. The release element 21 is pushed downward by the return spring 23 and in the retained state engages with its retaining element 21c from behind the lateral shaped part 11c on the injection device (bottom left). The additional module is locked in the retained state by the engagement of the distally directed retaining surface of the retaining element 21c behind the proximally directed retaining surface of the shaped part 11c on the injection device. To release the additional module, the release element 21 must be pulled upwards at its lateral gripping surface 21a away from the longitudinal axis until the locking is released by the retaining element 21c and the locking cam 24a engages again. The control spring 25 relaxes and the injection device is removed from the additional module.

[0062] Figure 7 A second variant of an additional module 2 according to the invention is shown in a view perpendicular to the longitudinal axis (left) and in a view in the direction of the longitudinal axis (right). The additional module comprises a sleeve-shaped module housing 20 with a receiving area 20a for receiving an injection device by moving it in the distal direction or by pushing the additional module in the proximal direction onto the injection device until it comes into contact with a stop surface 11b. Figure 1 Injection device in. In the set state, the boundary surface of the accommodating area 20a is at least tightly against the supporting surface 10a. The additional module also includes a release element 21 configured as an adjusting rod, which can be rotated or rotated from the holding state to the release state shown in a plane perpendicular to the longitudinal axis. The release element 21 includes a comprehensive gripping surface 21a with parallel ribs, and these ribs have an extension range corresponding to the width of the fingers in the direction of the longitudinal axis. Thus, the release element 21 can be grasped and rotated, rotated, tilted or swung perpendicular to the longitudinal axis using the thumb and index finger of the hand. In the holding state not shown, the release element 21 and the module housing 20 form a continuous surface without obvious steps or transitions, which is suitable as a handle for the user to grasp the additional module and the injection device.

[0063] Figure 8 Shown in accordance with Figure 7 , and a first embodiment of a second variant is shown in the plane AA perpendicular to the longitudinal axis direction, and in the viewing direction of the distal end, which has a form lock relative to three molded parts 11c on the sleeve holder. At least the tip of the molded part radially protrudes beyond the surface of the instrument housing or the sleeve holder surrounding the molded part. The release element 21 has three inwardly directed, protruding retaining elements 21c, which are distributed on the inner circumference corresponding to the arrangement of the molded part 11c and are connected to the adjustment ring in a rotationally fixed manner. In the holding state (left side), the retaining element 21c is located on the molded part in a form-locking manner and thus prevents the additional module from moving in the distal direction. The molded part 11c is released for proximal movement by rotating it by up to 60°.

[0064] Fig. 9 A cross section perpendicular to the longitudinal axis in the distal viewing direction of a second embodiment of a second variant is shown, which has a form fit with respect to two shaped portions 11c on the cannula holder. In this embodiment, the release element 21 is a circular adjustment ring with a surrounding gripping surface 21a. Fig. 9 On the right side, it indicates the release state, while Fig. 9The holding state is shown on the left. When transitioning from the release state to the holding state, the adjusting ring is rotated 45° in the clockwise direction and two radially movable guide cams 21g are pushed inward in the direction of the arrow by means of two eccentric guide grooves 21f connected to the adjusting ring in a rotationally fixed manner. The guide cams 21g are coupled to the radially movable holding element at least in the radial direction or are constructed integrally with it, so that the holding element also moves inward and engages with the molded part 11c from behind. The rotational movement of the release element 21 can also be converted or deflected into the radial movement of the holding element by other forms of sliding groove control devices or wedges instead of the guide grooves, wherein the guide cams can also be fixedly mounted on the adjusting ring in the radial direction and can be provided to cooperate with the eccentric guide grooves on the holding element.

[0065] Another embodiment of the second variant relates to the combination of the tilting or rotating release element as described above, which has a force lock on the instrument housing. The clamping force required for this is generated by a preloaded metal band, such as in combination with Figure 3 As described, in which, in order to release the non-positive connection, one end of the metal strip is rotated relative to the other end of the metal strip connected to the module housing by means of a release element. As an alternative, for example, instead of Fig. 9 The brake caliper can be radially pressed against the surface of the housing of the injection device by means of a retaining element in the injection device via a guide cam and an eccentric guide groove.

[0066] Fig.10 A third variant of an additional module 2 according to the invention is shown in a view perpendicular to the longitudinal axis (left) and in a view in the direction of the longitudinal axis (right). The additional module comprises a sleeve-shaped module housing 20 with a receiving area 20a for receiving an injection device by moving it in the distal direction or by pushing the additional module in the proximal direction onto the injection device until it stops on a stop surface 11b. Figure 1 In the inserted state, the boundary surface of the receiving area at least closely rests on the support surface 10a. The additional module also includes a release element 21 designed as a push button, which can be moved perpendicular to the longitudinal axis from the holding state to the released state shown. The release element 21 includes an upwardly pointing square or circular pressure receiving surface or actuation surface, the extension of which corresponds to the fingertip of the user, preferably at least 0.5 cm 2. As a result, the release element 21 can be pressed downward perpendicularly to the longitudinal axis in the direction of the arrow during the release movement. In the holding state, which is not shown, the release element and the module housing form a continuous surface without obvious steps or transitions, which is suitable as a handle for the user to grasp the additional module and the injection device. The pressure-receiving surface or the control surface can also be different from the shown planar shape and include edges when transitioning to the inclined side sections of the module housing. In the released state, the push button can protrude beyond the module housing 20 as shown in the figure, sink relative to the surface of the module housing, or as a button can also occupy the same position as in the holding state.

[0067] Fig.11 The first embodiment of the third variant with force closure is shown according to Fig.10 The cross section is perpendicular to the longitudinal axis in the plane AA of the device. The metal clip 22 is composed of a metal strip having a width that does not exceed the axial extension range of the release element 21 and a length that is not less than the circumference of the device housing. The metal strip forms a loop with a 320° bend and two ends 22a, 22b at an angle thereto. The bend is tightly against the device housing 10 in the shown holding state, and the two ends 22a, 22b are preloaded or pushed in opposite preload directions indicated by two arrows. A force lock with minimal static friction can be generated between the device housing and the metal strip, optionally via a radially compressible section of the module housing.

[0068] In the released state, the two ends 22a, 22b of the metal strip move away from or open apart in the direction opposite to their respective prestressing direction, and the bent section of the metal strip does not rest so tightly against the device housing when the non-positive connection is released, so that the device housing can move relative to the additional module. The movement of the two ends 22a, 22b is controlled by the release wedge 21b of the release element 21, here by a wedge-shaped tab in the longitudinal direction, which separates the two ends against their prestressing when the user presses the release element and the release element performs a release movement in the radial direction.

[0069] Fig.12 The viewing direction along the distal end of the second embodiment of the third variant is shown in accordance with Fig.10 The cross section perpendicular to the longitudinal axis in the plane AA of the third variant has a relative Figure 4The two lateral moldings on the central sleeve holder are positively locked. The release element 21 has two parallel arms, the distance between which corresponds to the diameter of the injection device. At the end of each arm there is a holding element 21c, which in the holding state (left side) engages from behind one of the moldings 11c on the sleeve holder. The release element or recess in the arm is connected to the holding element upwards, which in the release state (right side) aligns with the molding 11c after the squeezing movement and releases it. The release element 21 is preloaded into the holding position by a return spring 23, which is compressed during the release movement.

[0070] Fig.13 The third embodiment according to the third variant is shown in the proximal viewing direction. Fig.10 The third variant has a cross section perpendicular to the longitudinal axis in the plane AA of Figure 4 The positive locking of the four shaped parts on the upper sleeve holder. Here, the half of the module housing 20 and the push button of the release element 21 are shown in an axial view. The flange on the sleeve holder has four evenly distributed shaped parts 11c. The release element 21 includes a retaining element 21c, which engages with two shaped parts 11c from behind on the side of the injection device opposite the push button when the release element 21 is pushed into the holding position (left side) by the return spring 23.

[0071] Fig.14 A fourth embodiment is shown which has a third variant of a form-fitting connection with an injection device. Fig.14 The additional module 2 shown in an oblique top view again has a release element 21 in the form of a push button and, in addition, a touch sensor 20b described below. The module housing has a window 20c or an opening in the region of the label on the injection device, ie relative to the support surface. Fig.14 The longitudinal section in the released state is shown at the bottom. The upwardly directed pressure receiving surface or control surface of the release element 21 is significantly lowered relative to the surface of the surrounding module housing, that is to say preferably by at least 1 mm. The release element 21 is preloaded upwards in the opposite direction of the user's pressing direction by a return spring 23, and the axially movable control element 24 is preloaded toward the proximal end by a control spring or ejection spring 25. The control element 24 is designed in an annular shape and is penetrated by the inserted injection device. The return spring and the control spring are shown as pressure-loaded helical springs, but the preload of the release element and the control element can also be achieved by a tension spring or other elastic element.

[0072] Fig.15 A first implementation of a fourth embodiment of the third variant of the present invention is shown, which has a configuration corresponding to the configuration according to Figure 4The two lateral shaped parts of the central sleeve holder are positively locked. The release element 21 comprises two parallel arms and a retaining element on each arm, wherein in the selected view only the arm 21d facing the observer is visible and the relevant retaining element 21c is located on the inner side of the arm 21d. In the released state (right side), the shaped part in the form of the locking cam 24a of the control element 24 is engaged in the recess 21e of the release element 21, so that despite the preload, the release element 21 is locked and cannot move upwards by the return spring 23. As soon as the injection device is introduced from the proximal direction and the control element 24 is pushed distally by the stop surface 11b or the shaped part 11c under the compression of the control spring 25, the locking cam 24a is axially moved out of the recess 21e and the release element 21 is unlocked. The release element 21 is pushed upward by the return spring 23 and engages with its retaining element 21c from behind in the lateral shaped part 11c at the injection device (left side). As a result, the additional module is locked relative to the injection device in the holding position.

[0073] To release the additional module, the release element 21 must be pressed downward toward the longitudinal axis by pressure on the pressure surface until the locking is released by the retaining element 21c or the release element or the recess in the arm is aligned with the shaped part 11c, similar to the embodiment according to Fig.12 . The locking cam 24a snaps in again, the control spring 25 relaxes and the injection device is removed from the additional module. As an alternative, the locking cam can also be arranged on the release element and engage in a recess of the control element. For tolerance reasons, in the retained state, further compression of the control spring 25 or a small axial movement of the injection device, its molding and the control element in the distal direction relative to the retaining element of the release element and thus relative to the module housing is not excluded. However, within the meaning of the invention, the additional module is axially retained relative to the injection device even if there is a movement with a travel of between one tenth and one millimeter caused by tolerance or intentional.

[0074] Fig.16 A second implementation of the fourth embodiment of the third variant of the invention is shown, which has two parallel lateral positions on the sleeve holder. Figure 4 The two grooves 11d are arranged in the distal direction next to the flange and replace the lateral shaped portions of the first embodiment. Fig.16In the longitudinal section of the embodiment of the present invention, it can be seen in the released state (right side) and another difference from the first embodiment is that the control element 24 has a proximal extension 24b in the form of a plurality of tappets or pins. The proximal end of the extension 24b abuts against the stop surface 11b on the sleeve holder 11 of the insertion injection device and pushes the control element 24 distally. In the retained state (left side), the locking cam of the control element releases the release element for upward movement, so that the retaining element of the release element is introduced into the groove (not shown). The extension 24b can easily coordinate the movements of the control element and the release element with each other, for example, it can be ensured that the retaining element 21c is not released for the locking movement until the groove 11d is moved far enough to the distal end.

[0075] Fig.17 A longitudinal section of a fifth embodiment of the third variant is shown with respect to the embodiment according to Figure 4 The two lateral shaped parts of the central sleeve holder are positively locked. Fig.15 In contrast to the fourth embodiment of the invention, the return spring and the control spring are combined in a single spring and the control element is supported rotatably, rather than axially displaceably. Fig.17 As shown in the released state at the top of FIG. , the control element 24 has a rotation axis 24 c with which it is rotatably anchored in the module housing 20 and about which it can be tilted from the released position into the holding position ( Fig.17 Lower middle). The opening for the injection device formed by the control element 24 is designed to be slightly elliptical in a direction perpendicular to the rotation axis 24c. The release button 21 also includes two lateral parallel arms, which have a recess into which the locking cam of the control element engages in the release position and a retaining element (not shown) that engages the molded part 11c from behind in the retaining state. The torsion spring 26 presses the push button of the release element 21 upward with the first leg 26a and presses the control element 24 toward the proximal end with the second leg 26b. In the release position, the pressure surface of the release element sinks and the torsion spring 26 is tensioned. In the retaining state, the control element is oriented perpendicular to the longitudinal axis, the pressure surface is flush with the surface of the module housing in the retaining position, and the torsion spring 26 is slightly relaxed because the tensioning movement of the first leg 26a is overcome by the relaxation of the second leg 26b. In this embodiment, too, the locking of the shaped part 11 c is released by pressing the push button, pushing the injection device proximally and locking the button in the pressed-in release position.

[0076] Fig.18 Two partial longitudinal sections of a sixth embodiment of a third variant are shown, the third variant having a configuration corresponding to that according to Figure 4The two lateral shaped parts of the central sleeve holder are in a positive locking manner. As in the above-mentioned fifth embodiment, the control element is rotatably supported and, as in Fig.15 As in the fourth embodiment of the invention, in this embodiment, the return spring and the control spring are separated and can therefore be adjusted separately. Fig.17 As shown in the upper middle part, Fig.18 The control element 24 in the module also has a rotation axis 24c in the lower side opposite to the release button 21, and the control element is rotatably anchored in the module housing 20 by means of the rotation axis, and when the injection device is pushed distally relative to the module housing, the control element can be tilted around the rotation axis from the release position shown to the holding position. The control spring 25 is a non-planar spring ring or a spring clamp with an opening for the injection device, which is supported on the module housing or the control element at two locations opposite to each other with respect to the longitudinal axis. The release button 21 also includes two lateral parallel arms 21d, which have a recess 21e and a retaining element, and the locking cam 24a of the control element is engaged in the recess in the release position, and the retaining element engages the molded part (not shown) of the injection device from behind in the holding state. The reset spring 23 is a pressure-loaded helical spring.

[0077] Fig.18 The upper part shows the instrument cover detector with the tilting element 27, which is used as soon as the instrument cover is tilted in the proximal direction (in Fig.18 When the tilting element 27 is placed (from the left in the figure) on the cannula holder of the injection device installed in the additional module or removed from it, the tilting element 27 tilts about the rotation point 27a. The first or distal leg 27b of the tilting element is held in an approximately axial orientation by the return spring 23 and is pressed upwards (in the direction of the arrow) from this position by the proximal edge of the instrument cover. As a result, one end of the second or radial leg 27c of the tilting element, which is arranged at an angle of approximately 90° relative to the first leg, moves substantially proximally, which is recognized by the switch element 28a actuated in the axial direction.

[0078] Fig.18 The lower part shows an injection device detector with an axially oriented rod 21h at the release button 21 and the switch element 28b. By the inserted injection device, as described, the release button 21 is released for the vertical axis (at Fig.18The corresponding movement or final position of the rod 21h is detected by the switch element 28b. Therefore, in this context, the presence of the injection device is detected only when the insertion movement is completely completed, rather than after partial insertion. The injection device detector is provided as an alternative or additional solution to the device cover detector. The switch elements 28a, 28b preferably include electronic microswitches, sliding contacts or optical detectors, which are arranged on a circuit board fixedly mounted in the module housing.

[0079] Fig.19 In the upper part, it is shown that Figure 4 Five different configurations of the profile 11c on the flange of the sleeve holder, starting with the middle configuration (far left). The five configurations differ in particular in the number of profiles, the arrangement or distribution of the profiles on the circumference of the sleeve holder and the shape of the profiles in the cross section shown perpendicular to the longitudinal axis. Here, the shape includes not only the width or extension in the circumferential direction, the height or extension in the radial direction, but also the contour of the individual profiles, and in particular the deviation from the perfectly radial or circular contour section. However, advantageously, no profile is provided in the angular range of the bearing surface at the injection device, that is, in the corresponding angular segments of at least 120° and preferably at least 90°. As a result, the boundary surface of the receiving area, which is in close contact with the bearing surface in the holding state, is not affected by the groove for axially guiding the profile.

[0080] Fig.19 In the lower part, three different configurations of the embossing 11d on the cannula holder 11 are shown in cross-section perpendicular to the longitudinal axis, as well as the matching release element 21 of the additional module. The release element 21 forms an opening for the injection device and is in contact with the Fig.12 The embodiment of works similarly with a return spring (not shown). The release element has a section opposite the push button, which has an inwardly directed shaped portion as a holding element for engaging in an embossing in the sleeve holder.

[0081] Corresponding to Fig.19One of the last four configurations of the top or the additional module that matches this configuration cannot be set on the injection device with one of the other configurations. It is best to install the injection device with the first configuration in the additional module for the second configuration. Therefore, a clear correspondence between the injection device and the additional module can be generated in the sense of the key lock principle. It can be prevented by personalized molding or stamping that the additional module is intentionally or if, for example, a plurality of injection devices are used in the patient's environment, due to negligence, it is set on the wrong injection device. In the context of this article, the wrong injection device is such an injection device, which is the same except for the difference in the molding or stamping mentioned, but is arranged for another medical indication. The difference in medical indications includes different active ingredients, preparations, durability, treatment and / or patients, and the corresponding instructions on the label. The molding can also be arranged on the housing of the automatic injector or on other parts of the sleeve holder, wherein, at least the axial arrangement of the molding that is not particularly engaged from behind by the retaining element of the release element can be arbitrary for the purely axial movement of moving in. Often, the axial arrangement of the shaped part already prevents the insertion of an unmatched additional module, or in the case of an embossing, a movement of the retaining element is only prevented when an attempt is made to transition to the retained state.

[0082] Fig. 20 The longitudinal section of the additional module 2 is shown with an inserted charging cable 3, which is used for charging or recharging the energy storage device of the additional module and / or for exchanging data with a third device. The additional module has a charging socket for a charging plug 31 of the charging cable, for example a USB-C port, which can only be accessed from the receiving area 20a or by the user with a standard charging cable. Accordingly, the charging socket is covered by the inserted injection device in the receiving area, and thus ensures that the charging cable has to be removed again before the additional module is put into operation or before the injection device is inserted. Preferably, the charging plug 31 can be accessed in a straight line through the opposite window 20c in the module housing 20 and laterally through the receiving area 20a. The size of the window 20c is coordinated with the readable area of ​​the label on the injection device and thus provides sufficient space for handling at the charging cable, in particular to grip the charging plug 31 with two fingers. An alternative solution for preventing the charging plug from being inserted when the injection device is inserted comprises that the charging socket is at least partially moved behind a partition in the surface of the module housing when the injection device is inserted, or comprises a bistable cover which is moved in front of the axial access to the receiving area in order to release the charging socket only when and only when no injection device is present.

[0083] As in Fig.14As shown in , the additional module 2 has touch sensors 20b. These touch sensors are used to detect touching of the additional module and in particular to detect gripping of the additional module. In the assembled state, an impending operation is inferred and, for example, the sensor state is activated. For this purpose, every possible feasible option for gripping the additional module should be reliably detected, in addition to gripping with the whole hand, in particular also gripping with only two fingers on the opposite side of the additional module in the manner of tweezers. Therefore, the additional module has sensor areas on both side surfaces, on the cover surface and on the end face. The exemplary capacitive touch sensor is preferably adhered to the module housing as a label or wrapped as a film with the material of the module housing in an injection molding process. In addition to the touch sensors, Fig.18 The upper instrument cover detector can also be used to detect an inserted or removed instrument cover for an expected state change of the additional module.

[0084] Reference numerals list

[0085] 1Injection equipment

[0086] 10 Instrument housing

[0087] 10a Support surface

[0088] 11 Casing holder

[0089] 11a Bump

[0090] 11b stop surface

[0091] 11c Forming Department

[0092] 11d embossing department

[0093] 12 dose selection buttons

[0094] 13. Dosage display unit

[0095] 14 Eject Button

[0096] 2Additional Modules

[0097] 20 module housing

[0098] 20a Accommodation area

[0099] 20b touch sensor

[0100] 20c Window

[0101] 21 Release Components

[0102] 21a Grip surface

[0103] 21b Unwedge

[0104] 21c holding element

[0105] 21d arm

[0106] 21e recess

[0107] 21f boot slot

[0108] 21g guide bumps

[0109] 21h rod

[0110] 22 Metal Clips

[0111] 22a, b end

[0112] 23 Return spring

[0113] 24 control elements

[0114] 24a Locking cam

[0115] 24b extension

[0116] 24c Rotation axis

[0117] 25 Control spring

[0118] 26 Torsion spring

[0119] 26a, b Spring legs

[0120] 27Tipping element

[0121] 27a Rotation point

[0122] 27b, c rod legs

[0123] 28a, b switch

[0124] 3Charging cable

[0125] 31 plugs.

Claims

1. An injection system, comprising an injection device (1), the injection device having a longitudinal axis and an ejection button (14) arranged at the proximal end of the injection device and movable in the distal direction along the longitudinal axis for ejecting liquid medicine from a container of the injection device, and the injection system comprising an additional module (2), the additional module having a sensor unit, a receiving area (20a) matching the shape of the device housing of the injection device for being mounted on the injection device along the longitudinal axis, and a retaining mechanism, the retaining mechanism releasably retaining the mounted additional module to prevent axial movement relative to the injection device, characterized in that The receiving area (20a) is designed in such a way that the ejection button (14) can be touched even when the additional module is installed, and the additional module comprises a release element (21) which can be moved only in a plane perpendicular to the longitudinal axis or in a direction at least approximately perpendicular to the longitudinal axis during a release movement for releasing the holding mechanism. The release element (21) comprises two end positions with a release position and a holding position, wherein the release position is visually distinct from the holding position.

2. The injection system according to claim 1, characterized in that The release element (21) is designed for a linear release movement.

3. The injection system according to claim 1, characterized in that The release element (21) is arranged in the distal half of the additional module.

4. The injection system according to claim 1, characterized in that: The additional module (2) has a handle which is designed such that a user can actuate the ejection button (14) with the same hand when grasping the handle in a first handle position and at least partially cover the release element (21).

5. The injection system according to any one of claims 1 to 4, characterized in that The receiving area (20a) is constructed to receive the injection device (1) by moving the injection device (1) in the distal direction, and the injection device has a proximally directed retaining surface which engages with a retaining element (21c) of the retaining mechanism from behind and retains the injection device to prevent a proximally detached movement.

6. The injection system according to claim 5, wherein: The injection device (1) comprises a sleeve holder (11) for accommodating the distal end of a container and a proximal device housing (10) for accommodating an output mechanism for ejecting a liquid drug from the container, characterized in that the holding surface is formed by a molded portion (11c) or an embossed portion (11d) on the sleeve holder.

7. The injection system according to claim 5, characterized in that The release element (21) adopts a stable release position at the end of the release movement.

8. The injection system according to claim 7, characterized in that The release element (21) performs a holding movement opposite to the release movement by moving the injection device (1) into the additional module (2).

9. The injection system according to claim 8, characterized in that The holding mechanism comprises a control element (24) which moves under the tension of a control spring when the injection device is inserted and thereby unlocks the holding movement of the release element (21).

10. The injection system according to claim 9, characterized in that The holding movement of the release element (21) is driven by a return spring (23).

11. The injection system of claim 5, wherein: The injection device has a molded part or a stamped part, and the additional module has a groove corresponding to the molded part (11c) in the boundary surface of the accommodating area (20a), and / or has a retaining element (21c) corresponding to the stamped part for being embedded in the stamped part (11d), characterized by another injection device, which differs from the injection device only in the molded part or the stamped part and the medical indication.

12. The injection system according to any one of claims 1 to 4, wherein: The additional module (2) has a charging socket for connecting a charging cable (3) for charging an energy storage device of the additional module, characterized in that the charging socket is inaccessible by the inserted injection device (1).

13. The injection system according to claim 12, characterized in that The charging socket opens into the receiving area (20a), and the additional module has a lateral opening through which the charging cable (3) can be inserted into the charging socket.

14. The injection system according to any one of claims 1 to 4, characterized in that The additional module (2) has an instrument cover detector for identifying an instrument cover mounted on a sleeve holder (11) of an injection device (1), the instrument cover detector having a tilting element (27) and a switching element (28a), the tilting element being used to convert a movement of a first leg end of the tilting element in a direction perpendicular to the longitudinal axis into a movement of a second leg end of the tilting element in an axial direction, the switching element being operated by the axial movement of the second leg end.

15. The injection system according to any one of claims 1 to 4, characterized in that The additional module (2) has an injection device detector for detecting an inserted injection device (1), the injection device detector having a switch element (28b) which is actuated by a release element (21) in a locking movement opposite to the release movement and / or in a subsequently assumed holding position.

Images