Automatic injection device

Self-injection devices are used to manage products,

5 especially liquids with medicinal or cosmetic effect. Likewise, after activating a drive mechanism, an injection needle is automatically injected, by means of which the product is administered, in a certain section in a tissue.

An auto-injection device, as corresponds to the invention, comprises at least one housing, a container that can be displaced by the housing, from which a product to be administered by a needle located at the exit of the container is ejected by advancing a plunger , and a drive piece of a feed device, contained in a movable way in the housing than in a self-injection, advances the container in relation to the housing to a certain anterior position to inject the needle, and advances the plunger in the

fifteen container to eject the product. As soon as the container reaches its previous position in a self-injection, the needle has been moved forward in a certain section, together with the container, also, when determining the section, the depth of penetration of the needle is also basically determined. These types of auto-injection devices are known for the memories.

twenty US-PS 159,192, EP 0 516 473 B1 and US-PS 5,643,214. In the case of known self-injection devices, the advance of the container together with the needle applied therein is carried out by pressing the drag piece on the plunger. EP 0 824 923 A1 is known as a device for

25 self-injection, in which the advance of the container in relation to the housing and the advance of the plunger in the container are decoupled from each other. The decoupling is done by releasing a ratchet gear.

The present invention has the objective of creating a self-injection device with a simple mechanical decoupling of the forward movement 30 of the container and the forward movement of the piston in the container, which

It allows a smoother step between both forward movements.

According to the invention, the drive piece in the self-injection device of the type described above is decoupled from the plunger until it reaches the previous position of the container, and is decoupled from the container upon reaching the previous position of the container and coupled to the plunger to move the

5 Plunger in the container. The forward movement of the container for injecting the needle is not carried out by means of the piston, that is, there is no drive connection between the actuator and the piston during this phase of movement. In this way, it is safely ruled out that during the advance of the container the product is ejected due to possible, even small movements

10 of the plunger in the container, that is, in relation to the container. When the carrier piece is uncoupled from the container in the previous position and is now only coupled with the plunger, the plunger is not advanced before the needle has been injected into the desired depth in the tissue. The separation in the drive of the forward movement of the container and the forward movement of the piston in

fifteen the container raises the accuracy of the dosage, since no pressure is exerted on the plunger already by advancing the container, whereby the product can be ejected too early. The drag piece can act directly on the container to advance the container.

twenty Preferably a transmission piece is provided, which is dragged by the drag part in a forward movement, which in turn acts on the container and / or on a container carrier and thus advances the container. The transmission part can also be a container port, but is preferably configured as a separate part of it.

25 Between the drive piece and the transmission part there is the disconnectable coupling. After disconnecting the coupling in the previous position of the container, another forward movement of the drive piece, namely to advance the piston, no longer produces any other advance of the transmission part. The drag piece is free of the transmission part, at least in relation

30 with its own movement forward. Just press against the plunger and therefore move it forward in the container. Preferably, the transmission part is contained

by the housing movable in the opposite direction to the forward movement of the piston. According to the present invention, the coupling between the drag piece and the container includes at least one continuous connection between the drag piece and the container or the transmission piece.

Preferably, a coupling is used which acts as a continuous and drag connection for coupling and uncoupling the drag piece with and from the container, as well as with and from the plunger. Also in this embodiment, the coupling is preferably configured between the drive piece and a transmission part,

10 Although you could also think of a coupling directly with the container. The coupling is preferably formed by a quick connection. When advancing the drag piece, a latch presses against a contact surface and thus advances the container. When the container reaches its previous position, in which it is in mutual contact with the housing, it

fifteen disconnects the quick joint by the driving force that is still exerted on the drive piece. The drive piece is coupled to the plunger and moved further forward, free of the container or free of the transmission part. A slight blow to reach the previous position of the container can be absolutely desirable and helpful.

twenty At least one of the means that make up the coupling is flexibly configured, preferably resiliently flexible. One or multiple latches can be configured directly on the drive piece, which thereby presses against a contact surface of the container or the transmission part, if such a part is used. This type of latches

25 may also be provided in the transmission part. Especially preferred, for the configuration of the coupling, is the inclusion of a third coupling means, which is then flexibly configured, preferably elastic flexible. Advantageously, the third coupling means is a flexible ring, especially an elastic ring, which is

30 embedded between two surfaces facing each other of the drive piece and the transmission part, and slides over one of these two contact surfaces as soon as the container reaches its previous position.

-4The present invention can be applied advantageously for self-injection devices, in which the container is formed by a so-called multi-chamber ampoule. Through this type of multi-chamber ampoules, the product to be administered just is obtained by mixing the contents of multiple separate cameras 5, when assembling the device. Each of the chambers arranged one behind the other is closed inversely by means of a piston movable in the container. To intermingle a mixing piece is pressed against the rear piston and it presses, in its forward movement in the container, each of the pistons to the previous piston. When advancing, connections are established or established with the respective adjacent adjacent chamber 10, so that the contents of the posterior chamber is moved towards the respective adjacent adjacent chamber. According to the present invention, the mixing part, especially a mixing tube, known per se, simultaneously forms the transmission part to move the container forward. The mixing part is assigned, according to the invention, a double function. This is achieved, as regards the construction, preferably by presenting the mixing piece a bridge that protrudes radially outwards, preferably in the form of a circular handle, with which it presses against the rear front surface of the container or, if it is preferred, against a rear contact surface of a container carrier, 20 that it carries with it the container in its forward movement induced by the mixing piece. Also the anterior position of the container is preferably defined by a stop of said container carrier against the housing. The housing can wrap both the container and the entire drive device, preferably having the shape of a bushing, 25 but it serves in its most general configuration only as a base piece, in relation to which the displacement movements of the container are made and the movements of displacement of the drive piece of the drive device and therefore should not be understood exclusively but preferably as a wrapper housing. 30 Exemplary embodiments of the invention will be explained below from Figures 1 to 6. It is shown:

-5 Figure 1 a self-injection device with continuous coupling and drag, Figure 2 a self-injection device with continuous coupling, 5 Figure 3 the transmission part of the device according to Figure 2, Figures 4, 5 the lock for the bushing Needle protector of the device according to Figure 2 and Figure 6 a self-injection device with a two-chamber ampoule and a mixing tube configured as a transmission part. 10 Figure 1 shows a self-injection device in the form of an injector pen, in a longitudinal section. The pencil has a hollow cylinder-shaped housing, in the exemplary embodiment, a circular cylindrical shape, with a needle guard 1 at its front end, an anterior bushing of the carcass 2 attached thereto and a rear bushing of the housing 3 attached thereto, closed on the front face by a shell layer 4. The front housing bushing 2 comprises a cylindrical container B, which in turn is held centrally, in a carrier of the container 30 in a coaxial direction to the longitudinal central axis of the housing. The holder of the container 30 is also shaped like a bushing and runs forward in centering tabs, which press 20 against the edge of the perimeter of the container B and center it on the bushing of the previous housing 2. The carrier of the container 30 is movable along the longitudinal central axis of the housing in both directions. By moving the holder of the container 30 the container B displaced therein moves. In turn, an injection needle N disposed at the outlet at the front end of the container B is moved forward and injected during a self-injection into and under the skin of a patient. In the container B a piston K is movable along the longitudinal central axis of the container B. When the piston K advances a product contained in the container B, in the exemplary embodiment, a medicated liquid, for example, insulin, it is displaced by the outlet and through the injection needle N for the expulsion of the product. A piston rod protrudes from the piston K, protruding from a rear edge of the container.

-6 Container B is expanded in the form of a flange along its rear edge. The carrier of the container 30 is also correspondingly expanded at its rear end, and prolonged with an expanded cross-section, beating the container-shaped section by a section. The container B lies in an installed state with its subsequent expansion next to the surface of the holder holder of the container 30, oriented towards this expansion. A lateral surface of the container holder 30 is surrounded by a compression spring that serves as a return element 33, which is in contact with an anterior end next to the surface of the handle of the front half of the housing 2, 10 and from there it does not completely protrude to an opposite surface 31, which is configured by the expansion of the container holder 30 and is oriented towards the surface of the handle mentioned above, of the front shell of the housing 2. By advancing the holder of the container 30 and thereby the container B, the compression spring 33 is pressed between both facing surfaces and thereby dampens the forward movement when the needle N is injected. surface 31 touches, when advancing, against a surface of the handle, formed in the area of ​​a stepped expansion of the casing of the anterior housing 2. The stop of the surface of the handle 31 of the cover of the container 30 defines an anterior position of the container B and thereby that length with which the needle N, in the anterior position of the container B, 20 protrudes to the leading edge of the housing, by which, also at the same time determines the depth of the injection of the needle N, assuming a correct support of the pencil on the skin. A drive device for moving the container B and for advancing the piston K in the container B, is formed by a drive element 5 formed by a compression spring and a drive piece 10. The drive can also be carried out by means of a pressure agent The drag piece 10 essentially has a bushing shape, with a bushing pot open at the rear side, closed by a base. At its front end the drag piece 10 is continued in the form of a bushing in the direction of the piston rod, 30 a comparatively short section protruding through the mentioned base. The continuation is formed by a seal 11 to press against the piston rod and advance the piston K in the container B.

-7In the represented output state of the injector pen, a direct pressure of the seal 11 is not made against the piston rod. In the exit position, a small clearance remains between the seal 11 and the rear front surface of the piston rod. In the represented exit state of the pencil, in which the container B is in its rearward displacement position, the drag piece 10 is coupled to the container B. The drive piece 10 is directly coupled with the transmission piece 20, which acts directly on the container B. In the same way the transmission piece 20 could act on the carrier of the container 30, then dragges between the carrier of the container 10 should be provided. 30 and the container B. In principle also the drag piece could press directly on a container or a carrier of the container, to advance the needle. The transmission piece 20 is formed by a hollow body, in whose rear area a circular handle 22 is formed, through a transverse reduction, 15 said handle serves as the front contact surface for an elastic deformation ring 21. The ring of Elastic deformation 21 is held in a groove that runs on the outer side surface of the drag piece 10, in the area of ​​the seal 11, secured against displacement relative to the drag piece 10. The ring 21 may be configured as a closed flexible ring, but preferably consists of a rigid material such as plastic or metal, and is openwork in one part, so that the ends of the ring 21 oriented towards that point can be moved a little further towards yes and, thus, the diameter of the ring can be reduced. This transfer ring 21, the handle 22 and the wall 12 oriented to the handle 22 of the groove form a coupling that is based on a continuous and detachable drive connection between the drag piece 10 and the transmission piece 20. The ring 21, as a pressure and coupling agent, could be configured as a flange on the drive piece 10 or the transmission piece 20, which would then be developed forming folding tongues. The drive piece 10 is held against the pressure of the drive part 5 in the outlet position shown in Figure 1, by means of a release tab 7 formed in the support and release sleeve 6. The joint is released by means of the pressure into the release tab 7.

-8 To inject the product, support the pencil with the leading edge of the needle guard 1 on the skin, exerting gentle pressure, after removing the protective cover from the needle. The release tab 7 is then pressed and in this way the joint between the release bush 6 and the housing is released. The 5 drive piece 10 is pressed forward by pressing the feed element in the housing. By coupling, the force that presses forward of the drive piece 10 is transmitted from the wall of the groove 12 to the ring 21 and from it to the handle 22, and thus to the transmission piece 20. The transmission piece 20 presses with a front front surface against the container B and the carrier of the container 30, which, with the exception of possible superficial friction forces, are in principle pressed forward in the housing without resistance, by means of the pressure of the transmission part 20. Needle N, which indicates exactly in the forward direction, is pressed forward protruding above the leading edge of needle guard 1 and enters the tissue. The advance of container B and 15 with it. the depth of the injection of the needle N, are limited by stops on the surface of the handle 32 of the holder of the container 30 against the opposite surface of the side of the housing. Container B is now located in its previous position. During the forward movement of the carrier of the container 30 and the container B there is a coupling between the drive piece 10 and the transmission piece 20. The coupling is arranged in such a way that it is disconnected when the previous position of the container is reached B. This occurs due to the size of the transfer ring 21 and the design of the handle 22 configured as support for the ring 21. The handle 22 is oriented diagonally or in an arc-shaped direction, in the forward direction, from the widest transverse cross section to the narrowest anterior cross section of the transmission piece 20. The yielding ring 21 is round in the transverse section. In principle, the cross-sectional shape of the ring 21 and the path of the handle 22 should only be coordinated in such a way that the transfer ring 21 does not exceed the handle 22 already before reaching the position of the previous container, for which the coupling must 30 transmit at least the reaction force that arises when advancing the container B and the force necessary to inject the needle, and that the coupling is not blocked but released securely after reaching the position of the previous container. The

Coupling coordination is optimal when the disconnection is also performed as far as possible free of jolts. If the coupling formed by the coupling means 12, 21 and 22, is disconnected, or also during disconnection, the drive piece 10 which

5 advances under the pressure of the drive element 5 comes into contact with the piston rod and is thus coupled with the piston, which is now pressed forward in contact with the drive piece 10 in the container B, so that the product It is displaced and ejected through the needle N.

To compensate for the decrease that accompanies the progress of the piece of

10 drag 10, of a force of the drive element 5, the transmission piece 20 may be conically widened in its inner side surface. The ring 12 would suffer a decreasing frictional force in the process of moving forward of the drive piece 10. For this improvement of the invention by controlled damping of the

fifteen driving force would be advantageous to the elasticity of the ring 21 or a pressure agent with the same effect. Alternatively to this sliding friction force compensation command, the decrease in the driving force can also be compensated pneumatically. In case of pneumatic compensation the

twenty space surrounded by the lateral surfaces of the drive piece 10 and the transmission part 20 would be sealed as much as possible. The guide ring 18 mounted on the rear end of the transmission piece 20 should be formed as a sealing ring for the drive piece 10, which would even form a plunger. Likewise the sliding surfaces formed between the lateral surface

25 inside of the transmission part 20 and the opposite surface of the seal 11 may be configured as sealing surfaces. Thus, by advancing the drive piece 10, an increasing hollow space would be formed between the outer side surface of the drive piece 10 and the inner side surface of the transmission piece 20.

30 In the guide ring 18 formed as a seal, only a calibrated passage opening should then be provided, through which an agent, preferably air, could then pass into the hollow space that is otherwise closed. The vacuum generated in this hollow space by the forward movement of the drive piece would only be compensated in a deferred manner, so that the feed rate of the drive piece 10 would remain constant throughout the entire travel path.

5 The spring 33 produces a damping and thus a delay in the forward movement of the holder of the container 30 with the container B. However, the holder of the container 30 and the container B travel a section of the path not hindered by the spring 33, given that the handle 31 of the holder of the container 30 just comes into contact with the spring 33 after traveling this section of the

10 travel. The forward movement along the remaining path to the previous position of the container is slowed by the return force of the weaker spring 33 compared to the force of the actuating element 5. Thus, an introduction is achieved as desired Fast needle, with subsequent slower thrust speed in deeper tissue layers. The tongues

fifteen of stop 2a formed in the front bushing of the housing 2 keep the holder of the container 30 in its rear position. However, under the pressure of the drive element 5 and, as a consequence, of the holder of the container 30, the stopper tabs 2a yield. By means of a clamping handle 7 'that crosses the housing, it is brought back to its rear position, that is, the support bushing is tensioned and

twenty release 6 content that can be moved by the housing, and with it the drag piece 10. In the rear position a container can be inserted again

B. The drive piece 10 and the bushing 6 are correspondingly joined together. Figure 2 shows an embodiment not according to the invention, of a

25 self-injection device, also in the form of a pencil, in a longitudinal section, and in a cross section AA. In the case of this pencil, the drive joint between the drag piece and the container, as well as between the drag piece and the plunger is established and released only by a continuous joint. It has, as another difference, a needle protection device, which covers the advanced needle after

30 removing it from the tissue and thereby reducing the danger of injury in subsequent handling.

-11 The carcass is also formed by a front bushing of the carcass 2 and a rear bushing of the carcass 3. The needle guard 1 is formed as a single piece, arranged in the front bushing of the carcass 2. In the hollow cylindrical housing is housed, in turn, a carrier of the container 30, in which the container B filled with the product to be administered is centered, also the carrier is movable along the longitudinal central axis of the housing in both directions. In the forward movement to inject the needle N, the holder of the container 30 is brought to a position of mutual contact of the front stop surface 31 against a stop on the side of the housing, whereby the previous position of the container 10 is defined B, that is, the depth of needle injection N. After carrying out the injection, both bushings of the housing 2 and 3 are unscrewed, whereby the container B and the holder of the container 30 are released from the transmission piece 20 and the holder of the container 30 is moved back to its rear position, the exit position, by the pressure of the return element 33 15 configured as a return spring, by a rear stop surface 31 against a stop surface on the side of the housing. In this rear position a new container B can be introduced. After screwing both casings of the housing 2 and 3, the pencil of figure 2 is ready for the next injection. As in the exemplary embodiment of Figure 1, the drag piece 10 20 of the pencil of Figure 2 acts, through a transmission piece 20 on the container; in the same way the transmission piece 20 could act on the carrier of the container 30, which would then carry the container B. The advance of the piston K in the container B is carried out by the direct pressure of the seal 11 of the drive piece 10 on the piston rod protruding towards 25 back of the container B, placed in the piston K by its rear side or configured in a single piece with the piston K. In figure 3 the drive piece 10, the transmission part 20 and a guide agent 40 are correspondingly represented to their position in figure 2. In relation to the coupling and disengagement of the drive piece 10 with and 30 of the transmission piece 20, it is always referred to the representation of figure 3. The drive piece 10 is formed by a completely cylindrical base body with a 11 seal with expanded cross section. The element of

drive 5, in turn, is formed as a compression spring and surrounds a part of the cylindrical handle of the drive piece 10. In the pencil exit position, it is tensioned between the thickened seal 11 and the ribs 9, oriented from the rear shell of the housing 3 radially inwardly on the part of the

5 cylindrical handle The drag piece 10 is held in its exit position by means of latches 15.

Multiple latches 15 are oriented, as an extension of the part of the cylindrical handle of the drag piece 10, moving away from the part of the cylindrical handle, and hold the ribs 9 oriented radially towards the rear.

10interior. From the outer lateral surface of the seal 11, a rib or cam 13 protrudes. With cam 13, the drive piece abuts a rear front surface 23 of the transmission piece 20. The transmission part 20 is formed by a cylindrical bushing. simple hollow, preferably a cylindrical bushing

fifteen circular, from whose outer lateral surface, in a posterior area, a cam 25 protrudes radially outward. On the inner radial surface of the transmission piece 20 a release slot 24 has been made which extends in a longitudinal direction of the transmission piece 20, leading to the front surface 23. The slot 24 is at least as large as the cam 13 of the drag piece

twenty 10 can be received in it. The transmission part 20 is disposed in a hollow cylindrical shell, preferably a circular cylindrical bushing, longitudinally movable and rotatable about the longitudinal axis. This bushing forms a guiding agent 40 for the transmission piece 20, such that

25 a movement of displacement of the transmission piece 20 in relation to the guiding agent 40 necessarily becomes a rotary movement around its longitudinal axis in relation to the guiding agent 40, that is, the displacement movement is superimposed by a rotational movement . The guiding agent 40 is configured as an independent bushing, fixedly mounted, not rotating or

30 movable in the housing. In principle, it could also be configured in one piece with the housing, here, with the rear sleeve of the housing 3, which, however, makes processing more expensive.

-13 The relative movement of the transmission part 20 in relation to the guiding agent 40 and the driving part 10 guided in a straight line inside the housing, securing it against rotation, is caused by a sliding guide configured between the transmission part 20 and the guide agent 40. 5 In the configuration of the slide guide a guide groove 41 for the cam 25 has been made, on the inner side surface of the guide agent 40, facing the cam 25 of the transmission piece 20. The guide groove 41 has a segment of the straight rear groove 42 and a second segment of the groove that continues to the first arc-shaped 43, optionally terminated diagonally, that is, the second segment of the groove 43 has a transverse component to the forward direction of the transmission part 20. In the exit position, the cam 25 is located in the groove segment 42. An activation mechanism has an outer sleeve 4, an activation button 7 and a return spring 8. The outer sleeve 4 surrounds the rear area 15 of the rear sleeve of the housing 3 and is movable in both directions on the outer side surface of the rear shell of the housing 3 along its longitudinal axis. The activation button 7 is inserted in a central opening of the rear front surface of the outer sleeve 4. It passes through this opening with an inner sleeve that extends almost to the latches 15 of the drag piece 10. 20 For injection, the pencil is pressed against the skin, so that a needle protective cap 50, movable in the area anterior in both directions in the longitudinal direction, it is introduced in the anterior bushing of the housing 2, under the needle guard 1, against the pressure of a return element 51 configured as a return spring. In this state, the needle N is still behind the leading edge, configured by the front ends of the needle guard 1 and the needle guard 50. The injection of the needle N and the expulsion of the product are carried out by means of the pressure of the activation button 7 in the longitudinal direction of the pencil on the drive piece 10 or its latches 15. The inner sleeve of the activation button 30 7, in turn, exceeds the rear ends of the latches 15, which are thus approached radially inwardly arcing, whereby the ratchet joint with the ribs is released 9 on the side of the housing.

-14 The pressure of the drive element 5 is transmitted, from the released drive piece 10 which presses with its cam 13 against the rear front surface 23 of the transmission part 20, to the transmission part 20, which, in turn , press with its front front surface against the rear flange surface of container B. With the front front surface of the same flange, the container B presses against the holder of the container 30, which, in turn, presses against a non-movable locking sleeve 60 in relation to the housing by means of a return element 33. However, the pressure force of the return element 33 is comparatively low in relation to that of the drive element 5, 10 so that under the pressure of the drive element 5, the drive piece 10, the transmission piece 20 and The carrier of the container 30 are displaced together with the container B in the housing along the longitudinal axis of the housing. In turn, the cam 25 of the transmission piece 20 enters its guide groove

41. As soon as cam 25 enters its displacement in the second

fifteen segment of the groove 43, the transmission part 20 is forced to rotate on its own axis, because of the transverse components of the second groove segment 43. The travel of the guide groove 41 is selected such that the groove of release 24 effected in the transmission piece 20 which ends at the front surface 23, is located in superposition to the cam 13, because of the movement

20 relative force in relation to the housing and in relation to the drive piece 10. As soon as the release slot 24 covers the cam 13, the drive piece 10 is disengaged from the transmission piece 20. The groove travel guide 41 is selected such that the overlay is restored as soon as the holder of the container 30 is in contact with the surface

25 of the front stop 31 in the housing and, thus, the container B is located in its previous position. With the decoupling, that is, the release, the drive piece 10 can continue its forward movement in relation to the transmission piece 20 under the pressure of the drive element 5. In turn presses against the piston rod, so that the piston K is pushed forward in the

30 container B, in direct contact with the drive piece 10, until the product is ejected.

-15 The injection of the needle N is determined, as desired, by the path of the guide groove 41. The needle N penetrates very quickly first, since in a first part of the forward movement of the transmission part, it advances in straight line in the direction of the advance and therefore no resistance to the advance movement of the transmission piece 20 is opposed. The penetration speed slows down as it continues to advance, since the guide groove 41 at that point also runs perpendicular to the direction of travel, in the example of execution, in a helical manner, and therefore the transmission piece suffers, when moving, the effect of a frictional force dependent on the inclination of the segment of the groove 10 guide 43. Additionally, the speed with which the needle is injected is reduced by the increasing return force of the return element 33. Figures 4 and 5 show together with figure 2 the mode of action of the needle guard that prevents the needle N protrudes freely from the carcass after removal from the fabric and may break or cause injury in case of negligent handling. The essential feature of the needle protection device is that for the purpose of injection, the movable needle guard 50 in relation to the housing is locked in a needle protection position after removing the needle, so that cannot be moved into the housing, one could also think of an external overlay of the housing. Figure 4 shows the front part of the pencil of Figure 2 in the anterior position of the container B. The protective sleeve of the needle 50 was pressed against the force of the return element 51 in its rearward displacement position in relation to the sleeve of the housing 2. The needle N protrudes above the housing and the protective sleeve of the needle 50 in the desired distance. The needle guard 50 has a rear stop surface and a front stop surface, which limit the travel path of the needle guard 50 in relation to the front shell of the housing 2 in the direction of travel and against The direction of advance. When the needle protective sleeve 50 moves in both directions, it passes through the locking sleeve 60, which has at its front end a hook 62 projecting outward diagonally or in a curve. In an area of ​​internal lateral surfaces with the

which slides down the hook 62, the protective cap of the needle 50 has, approximately corresponding to the length of its maximum travel path, a slightly expanded internal diameter. A passage area 52 between this anterior expanded cross-section towards the inner cross-section attached thereto is beveled so that the needle guard 50 can slide under the pressure of the return element 51 to behind the passage area 52, passed through hook 62. The protective sleeve of the needle 50 is provided, behind the passage area 52, with an intermediate area with longitudinal grooves 53, whose front front surfaces 54 each form a stop surface for a hook 62, as

10 can be better recognized in Figure 5. The locking bushing 60 is developed forming multiple tabs 61 elastically yielding, evenly distributed around the perimeter of the bushing, at which free front ends the hooks 62 are configured. The holder of the container 30, in turn, it also develops forming a tongue

fifteen 34 at its free front end. By advancing to the holder of the container 30, its tabs 34 are located under the tabs 61 of the locking sleeve 60. In this way, each of the tabs 61 is held radially inwards and can no longer be arched radially inwards. in the previous position of the container. The tabs 61 are not only held by the tabs 34, but

twenty additionally pressed radially outward. The tabs 34 are configured in a comparatively rigid manner in relation to the tabs 61, or they can be assumed as rigid in the first convergence in relation to these tab 61. After removing the needle the protective cap of the needle 50 is pushed

25 forward again by means of the return element 51. By the diagonal path of the surface 52 and / or the corresponding diagonal path of the hook 62, it exceeds this hook 62, whose tip termination is also elastically yielding. As soon as the needle guard 50 has been pushed so far forward that, seen in the direction of the advance, its surface of

30 stop 54 is located in front of the hook 62, it is locked against a backward movement by the hook 62 which stops against the stop surface 54. The hook 62 and the protective sleeve of the needle 50 are in mutual contact through the butt surfaces perpendicular to the direction of travel. In the safety position shown in Figure 5, after injection the needle N is protected by the protective cap of the needle 50.

Thus, the holder of the container 30 is also used as

5 movable support for the elastic element 62 and fulfills, according to the invention, the double function of carrying the container and locking the needle bearing sleeve 50. The needle protection device does not presuppose the configuration according to the invention of the device for self-injection, but it is used with special preference in combination with it. It is also advantageously applicable in devices of

10 Self-injection of this type and even without modifications also in injection devices in which the injection of the needle is carried out by manual displacement of the container in relation to the housing. Figure 6 shows, in a longitudinal section, and also, in a plan view, a self-injection pencil, in which the coupling of the drag piece

fifteen 10 with the container B as well as with the piston K, is based on a continuous and drag connection. The coupling is comparable, in its operation, to that of the pencil of figure 1. From now on it also always refers to the cross-sections included in the plan view and detail X. In the container B of the pencil of figure 6, it is a so-called

twenty double chamber ampoule, in which two product components, in two chambers arranged one behind the other, separated from each other in the state of distribution of the container B by an anterior piston K1, which are just mixed together by advancing the plunger rear K2 until it stops with the previous piston K1. In the chamber that is in front in the state of distribution is generally

25 a powder active agent, while a carrier liquid is conserved in the chamber formed between both pistons K1 and K2. In the state shown in Figure 6, both components are already completely mixed in the anterior chamber that is between the piston K1 and the container outlet, by the displacement of the rear piston K2 until being made

30 stop with the previous piston K1. The housing again has a socket of the anterior and a posterior housing 2 and 3, fixedly connected, for example, by screwing or footwear. A collapsible cover is inserted in the bushing of the rear case 3. The bushing of the front housing 1 is extended by a needle guard 1 and a needle guard 50 ', which can be moved back against a return force, for the injection of the needle N, and, after injection , adopt the advanced position again.

5 The container B is inserted into a carrier of the container 30 until it stops and is held in a centered manner. The carrier of the container 30 is movable against the force of the return element 33 in the housing.

The forward movement of the rear piston K2 is produced by assembling the front bushing of the housing 2 and the rear bushing of the housing

10 3. For this purpose, a mixing part 20 formed as a hollow body has been received in a fixed, non-rotational manner, in the rear bushing of the housing 3. The mixing piece 20 has an anterior area of ​​the bushing with an outer diameter smaller than the inner diameter of the container B, and a widened rear area compared to this previous area. A step is configured between these two areas of the bushing,

fifteen as a handle 28 radially projecting from the anterior area of ​​the bushing. Handle 28 is circularly configured; but it can also be configured by at least one radially projecting bridge. With its rear front surface, the mixing piece 20 touches bridges 9 radially oriented inwardly from the rear shell of the housing 3, which can also be configured as

twenty of circular walls. When assembling the device, that is, by screwing both bushings of the housing 2 and 3, the mixing piece 20, housed in the rear bushing of the housing 3 and thus secured against displacement, is introduced into the container B opened from behind and pushed forward on it. In turn, it pushes the rear piston K2 forward, in the direction of the previous piston

25 K1, until the rear piston K2 reaches the position shown in figure 1. In this position of the pistons K1 and K2, the screw-down of the casing bushings 2 and 3 has also been completed.

In the rear bushing of the housing 3 there is the drive device that includes the drive element 5 in the form of a compression spring 30 and the rod-shaped drive piece 10, which is guided in a straight line in the housing. The drive element 5 is tensioned between the bridges 9 and a

surface of the circular handle of the drive piece 20, oriented to the bridges 9, in relation to the direction of travel. The drive piece 10 is housed around a central longitudinal axis of the housing, which coincides with its own central longitudinal axis, in a rotational manner.

5 between two turning positions. To rotate the drive piece 20, a dosing sleeve D is provided which extends to the housing. In its rear area, oriented inside the dosing bush D, the drive piece 10 has guide grooves extending in the direction of advance, in which they engage a guide bushing 6a oriented towards the inside of the flip cover 4, rotary but insured

10 against displacement in relation to the flip cover 4, and an indicator bushing 8 housed by the housing in a rotary manner but secured against displacement. The guide bushing 6a is connected and secured against rotation with the dosing bushing D, as can be better recognized in the HH section. The guide bushing 6a serves to transmit the turning movement of the dosing bushing D to the part

fifteen of drag 10. The indicator bushing 8, attached secured against rotation with the drag piece 10, serves to indicate the rotation position of the drag piece 10 and, thus, to indicate the amount of regulated dose. For this purpose it is provided with marks on its outer perimeter, in the exemplary embodiment, with two marks for each of the two turning positions of the drag piece 10. The marks may

twenty be read through a housing opening. The indicator spout 8 and also the guide bushing 6a serve together with the mixing piece 20 as a straight-line guide for the drive piece 10. The drive piece 10 is supported by a locking and activation mechanism in the rear exit position shown. . This mechanical lock

25 and activation presents an activating means 7a in the form of an activation button, which acts on a blocking means 7b, perpendicular to the direction of advance of the drag piece. The construction and mode of action of the locking and activation mechanics can be better recognized in joint observation of the longitudinal section and the FF cross section.

30 The blocking means 7b is formed by a hollow body with a passage opening through which the drag piece 10 protrudes. In order to drive it in a straight line, the blocking means 7b is guided between two straight bridges of the housing in

direction perpendicular to the direction of longitudinal advance of the drive piece 10. Oriented respectively to these two bridges of the housing, the hollow body of the locking means 7b correspondingly has straight outer surfaces. The passage opening of the locking means 7b is larger than the outer diameter of the drive piece 5. By the pressure exerted on the activating means 7a the blocking means 7b is displaced perpendicularly to the direction of advance of the drag piece 10, against the force of a return element 7c configured as a compression spring. In the locked position the drag piece 10 touches, with a handle 29 configured by a thickening against a rear front surface

10 of blocking means 7b. By a perpendicular displacement of the blocking means 7b, this stop is canceled. The drive piece 10 is released from the locking agent 7b and can be moved forward in a longitudinal direction under the pressure of the drive piece 5. A safety device ensures that the activation agent 7a is only

fifteen actuated, and thereby the drag piece 10 is released, when a container B has been placed in the housing. The safety device comprises a total cycle control body 70 and a compression spring 19. The total cycle control body 70 has a central bushing area, from which two bridges 70a project forward longitudinally (cut EE ). Both 70th bridges cross

twenty two slots correspondingly formed in the handle 28 of the mixing piece 10 and touch the rear edge of the container B. From the central bushing area of ​​the total cycle control body 70, a third bridge 70b protrudes in the longitudinal direction towards the rear. This third bridge 70b crosses the activating means 7a, as can be better recognized in the joint observation of the longitudinal section with

25 both cuts F-F and G-G. At the height of the activating means 7a, that is, in the area that passes through the activating means 7a, the third bridge 70b of the control body of the total cycle 70 has a longitudinal cut. In this longitudinal section, a rib 7d of the activating means 7a projecting radially inwards engages when the activating means is actuated

30 7a, when the groove of the total cycle control body 70 is at the same height as the inner rib 7d of the activating means 7a. Seen in the longitudinal direction, behind the area with the groove, the third bridge 70b is formed,

again as a closed bridge. Between the bridge on the side of the housing 9 and a handle on the inner side surface projecting inwards from the central area of ​​the bushing of the total cycle control body 70, the compression spring 19 is tensioned. If a container B is placed, then the total cycle control body 5 presses with its anterior bridges 70a against the rear edge of the container B and is thus held in the position represented in the longitudinal section of Figure 1, in which the inner rib 7d of the activating means 7a can enter the groove of the total cycle control body 70 and move perpendicularly to the blocking means 7b. If a container has not been introduced 10, the total cycle control body 70 is moved forward by the compression spring 19, in the annular passage now free from this cause, until the central area of ​​the body bushing of total cycle control 70 touches the handle 28 of the mixing piece 10. In this locked position of the total cycle control body 70, the closed rear area of ​​the third bridge 70b is located in front of the

fifteen rib 7d of the activating means 7a. A perpendicular displacement of the activating means 7a is not possible in this case. The drive device is locked in that case.

Between the mixing piece 20 and the driving part 10 that passes through the mixing piece 20 there is a drive coupling, which causes the mixing piece 20 to be dragged by the drag part 10 in an advance movement of the drag part 10 , that is, it is pushed forward in relation to the housing. The coupling is established based on a continuous and drag connection in the anterior area of ​​the mixing piece 20, which resembles the coupling of the exemplary embodiment of Figure 1. The mixing part 20 adopts in its double

25 function of the function of a transmission part, and is hereinafter referred to as mixing and transmission part 20.

Unlike the coupling in the exemplary embodiment of Figure 1, in that of Figure 6 the elastic deformation ring 21 is housed in a groove formed in the inner side surface of the mixing and transmission piece 20, and 30 correspondingly, the drag piece 10 has, for the ring 21, only a contact surface 17 that causes the drag of the mixing and transmission piece

twenty. The contact surface 17 forms a first coupling means, a

contact surface 27 formed by the groove of the mixing and contact piece 20 is a second, and the ring 21 is a third coupling means. The mixing and transmission part 20 and the drag part 10 form a dosing device in an area disposed within a container B. The part

5 mixing and transmission 20 is provided, for this, with a notch in a lateral surface area that is behind the first coupling means 17. The notch has two grooves 25 and 26 extending in the direction of travel, arranged a side by side, angularly shifted in parallel. Slots 25 and 26 have a different length in the forward direction. The most slot

10 cut 25 is formed as a blind groove in the lateral surface, and the longest groove 26 is limited in the forward direction by the rear bridge of the groove for the third coupling means 21. At its rear ends the grooves 25 and 26 flow into the same groove in relation to the advancement device in a widening of the notch, as can be better recognized in the observation

fifteen joint of the longitudinal cut with the CC, DD and EE cuts. The widening of the notch reaches up to the rear front surface of the front area of ​​the bushing of the mixing and transmission piece 20. The side walls of the widening, facing each other, leading there, are respectively extended by one of the two grooves 25 and 26 in the direction of

twenty Advance. The drive piece 10 is provided with a cam 16 that projects radially. In the exit state of the injection device, the cam engages in the widening of the notch of the mixing and transmission piece 20. The notch with both slots 25 and 26 forms a first dosing means, and the cam 16 a

25 second dosing means of the dosing device. In a first dosing position the cam 16 is, aligned with the groove 25, in the first lateral wall of the extension extending in the direction of the advance, and in the second dosing position, the cam 16 is, aligned with the slot 26, on the second side wall of the widening

30 which extends in the direction of the advance of the notch. Between these two dosing positions, the drive piece 10 is rotatable about its longitudinal axis in both directions, at the outlet position of the injection device. Both side walls of the wide groove define both rotational and dosing positions of the drive piece 10, and the lengths of both narrow grooves 25 and 26 define the amount of solution of active substances expellable in an injection.

5 The widening of the notch in the mixing and transmission part 20 could be extended to almost the end of the short groove 25 in the direction of the advance, so that the notch would present, in the direction of the advance, a simple stepped development.

To carry out a self-injection, the self-injection device is

10 supported on a tissue surface, especially on human skin, with the 50 'needle guard anterior bushing, movable back in relation to the needle casing or front protector 1. By the pressure against the tissue surface the bushing Needle guard 50 'is shifted back to a rear position in relation to the housing. The injection needle N, disposed of

fifteen fixed mode at the exit of the container B and oriented in the direction of the advance, it is firstly still surrounded by the needle guard 1 and the needle guard 50 'which covers it beyond its anterior tip, and therefore not still touch the surface of the fabric. For actuation, that is, to inject the needle and expel the solution

twenty of active substances, the user presses the activation agent 7a inwards in radial direction, after having brought the drag piece 10 to the desired rotation or dosing position by means of the dosing cap D. By means of the inward pressure, the means lock 7b is moved under the stop handle 29 and the drive piece 10 is released. Under the pressure of the drive element 5,

25 it moves the drag piece 10, and by means of the coupling the mixing and transmission piece 20, both in relation to the housing, is also moved. The continuous and drag connection between the drag piece 10 and the mixing and transmission piece 20, is strong enough to cause the mixing and transmission piece 10 to be dragged, which on its side, pressing by its handle 28 against he

30 The carrier of the container 30, advances these in relation to the housing, against the force of the return element 33 to an anterior position, defined by a stop 31a on the side of the housing.

-24 In the previous position of the carrier of the container 30 or of the container B the coupling releases the drive joint between the drive piece 10 and the mixing and transmission piece 20. Under the pressure of the drive element 5 the ring still remains The transfer 21 is pressed by the fixing of the mixing piece 5 and transmission 20 and pushed over the diagonal handle 17. The drive piece 10 continues to advance relative to the mixing and transmission part 20 and also pushes both pistons K1 and K2 in the container in the direction of the exit of the container. The active substance solution is ejected through the needle N injected into the tissue, located in the anterior position of the container B. 10 The forward movement of the drag piece 20 is limited in the first dosing position by the anterior end of slot 25. In the first dosing position, the expulsion is finished when the cam 16 hits the wall of this groove, which extends in the direction of the circumference.