WO2017016961A1 - Injection device for medical purposes and a method for operating an injection device - Google Patents

Abstract

The invention relates to an injection device (1) for medical purposes, comprising an injection part (3) configured for the arrangement of an injection needle (5) on said injection part (3), and a needle protector (7) able to be displaced relative to the injection part (3), wherein the injection part (3) has a first magnet arrangement (9) and the needle protector (7) has a second magnet arrangement (11), and said magnet arrangements (9, 11) are configured to produce a controlled relative displacement of said needle protector (7) relative to the injection part (3).

Description

 Injection device for medical purposes and method for operating an injection device

description

The invention relates to an injection device for medical purposes and a method for operating such an injection device.

Injection devices of the type discussed here typically have an injection part with an injection needle, wherein a needle guard is displaceable relative to the injection part. The needle guard serves to protect a user of the injection device against accidental contact with and in particular injury to the injection needle. Prior to using the injection device, the needle guard is displaced by the user relative to the injection part, for example displaced rearwardly in the proximal direction or removed to expose the injection needle. There is a certain risk of injury due to manual operation. In addition, due to a lack of controllability of the displacement of the needle guard, no additional benefit in connection with the needle guard and its displaceability relative to the injection part can be realized.

The invention has for its object to provide an injection device for medical purposes and a method for operating such an injection device, said disadvantages do not occur. The object is achieved by providing the subject matters of the independent claims. Advantageous embodiments emerge from the subclaims.

The object is achieved in particular by providing an injection device for medical purposes, which has an injection part, which in turn can have an injection needle. The injection device furthermore has a needle guard that can be displaced relative to the injection part, wherein the injection part has a first magnet device, and wherein the needle guard has a second magnet device. The magnet means are arranged to effect a controlled relative displacement of the needle guard relative to the injection member. The injection device has advantages over the prior art. By virtue of the fact that a controlled relative displacement of the needle guard can be effected to the injection part, it is possible, in particular, to shift the needle guard in an automated or parameter-controlled manner, so that manual shifting is no longer necessary. Furthermore, a controlled relative displacement of the needle guard can be used to realize an added benefit. The needle guard can then take over its function of a protective cap in addition to other functions in the injection device, in particular in connection with an injection.

The needle guard can be moved relative to the injection part, preferably at least into a protective position and into an injection position. The needle guard can preferably be arranged in a plurality of intermediate positions, particularly preferably in a continuum of intermediate positions, between the protective position and the injection position. be relocated. In this case, the protective position is characterized in that the needle guard completely engages over an injection needle arranged on the injection part such that an inadvertent contact of the injection needle and in particular an injury is excluded, whereby the injection position is characterized in that the injection needle is exposed so far in that an injection can be carried out with the injection device.

A controlled relative displacement includes the ability to actively hold the needle guard in a predetermined position. Furthermore, a controlled relative displacement includes an active displacement of the needle guard, for example in order to shift it from the protective position into the injection position. The relative displacement is preferably parameter-dependent controllable, wherein in particular a displacement speed, a displacement path, a displacement acceleration, a displacement force, and / or a direction of displacement of the needle guard can be specified / can. A controlled relative displacement additionally or alternatively includes inhibiting a displacement of the needle guard caused by other means, for example manually or in the course of an injection, wherein in particular a counterforce is built up by means of the magnetic devices. This type of controlled relative displacement also takes place preferably parameter-dependent, wherein in particular the counterforce can be specified.

Preferably, the injection device is set up for an axial relative displacement of the needle guard relative to the injection part. In this case, the injection part - and preferably also the outer part - has a longitudinal axis which coincides with the symmetry axis in the case of a cylindrically symmetrical design of the injection device. This longitudinal axis defines the axial direction. In this case, the needle guard is preferably displaceable in the axial direction from a distal protective position in a proximal injection position and vice versa.

An axial direction here and in the following therefore refers to a longitudinal direction of the injection device, which preferably coincides with an axis of symmetry, preferably a cylindrical injection device. A circumferential direction concentrically surrounds the axial direction. A radial direction is perpendicular to the axial direction. That in an injection targeted to the body of a patient facing the end of the injection device has in the distal direction, wherein the oppositely disposed end of the injection device - seen in the axial direction - in the proximal direction.

A preferred embodiment of the injection device is designed as an auto-injector. In this case, an autoinjector is in particular an injection device, which is set up to completely inject a dose of medicament encompassed by the injection part into the body of a patient as part of a single injection. Another preferred embodiment of the injection device is designed as a pen. In particular, a pen is an injection device which can inject individual doses of a medicament encompassed by the injection part into the body of a patient in the course of a plurality of injections. An embodiment of the injection device is preferred, which is characterized in that the first magnetic device is designed as a controllable magnetic device. Alternatively or additionally, it is possible for the second magnet device to be designed as a controllable magnet device. Basically, it is sufficient if one of the two magnetic devices is controllable, but it is quite possible to design both magnetic devices controllable. By means of at least one controllable magnetic device, a controlled relative displacement of the needle guard can be effected in a secure and reproducible manner.

It is thus possible according to an embodiment that the controllable magnetic device is arranged on the injection part. In this case, a contacting of the controllable magnetic device in a particularly simple manner possible, since no contact on moving parts must be taught. However, it is also an embodiment possible in which the controllable magnetic device is arranged on the needle guard. In this case, it is provided in particular that the control is produced via an interface between the needle guard and a part, relative to which the needle guard can be displaced, for example the injection part. To produce the particular electrical connection, longitudinal contacts and in particular friction contacts are possible in a conventional manner. Also, an inductive transmission of electrical power comes into question. A preferred embodiment of the injection device has a control unit, which is operatively connected to at least one of the magnetic devices for their control. The tax Further advises is further preferably arranged to effect a controlled relative displacement of the needle guard by controlling the at least one magnetic device. In particular, the control unit is preferably configured to effect the controlled relative displacement of the needle guard parameter-dependent.

An embodiment of the injection device is also preferred, which is characterized in that one of the magnetic devices is designed as a proportional magnet or as a linear magnet. The design of one of the two magnetic devices as a proportional or linear magnet in a particularly effective and at the same time easily controllable manner ensures that a controlled relative displacement of the needle guard can be effected relative to the injection part. The proportional or linear magnet can, for example, have a current-carrying coil or else a plurality of current-supplyable coils.

Preferably, the other magnetic device is designed as a permanent magnet. A permanent magnet is a simple as well as inexpensive design for a magnetic device. The combination of a magnet device designed as a proportional or linear magnet with a magnet device designed as a permanent magnet makes it possible in a particularly simple, effective and cost-effective manner to control a relative displacement of the needle shield relative to the injection part. Preferred is an embodiment in which the first Magneteinrich- device is designed as a proportional or linear magnet, wherein the second magnetic device is designed as a permanent magnet. Furthermore, an embodiment is preferred in which the second magnetic device is designed as a proportional or linear magnet, wherein the first magnetic device is designed as a permanent magnet.

In the following, for the sake of simplicity, only the term "proportional magnet" will be used, but the design as a linear magnet is always addressed.

An embodiment of the injection device is also preferred, which is characterized in that it has an outer part which surrounds the injection part. The outer part in this case has a larger outer diameter than the injection part and thus serves the better tangibility and handling of the injection device by a user. Furthermore, the injection part arranged inside the outer part is protected from impairments and / or damage by the outer part. Preferably, the needle guard is guided in the outer part. In this case, it is possible for the outer part to have at least one longitudinal groove, preferably a plurality of longitudinal grooves, on an inner peripheral surface into which at least one guide projection, preferably a plurality of guide projections, of the needle guard engage. As a result, an undesired relative rotation of the needle guard is avoided relative to the outer part and at the same time relative to the injection part, and the relative displacement of the needle guard relative to the injection part and to the outer part is guided safely. An embodiment of the injection device is preferred, which is characterized in that the outer part at least one Has locking position for the needle guard. It is possible that the needle guard can be latched in its protective position. It is then held securely and stably in the protective position, even if, for example, a magnetic device designed as a proportional magnet is not energized. Accidental misalignment of the needle guard and associated risk of injury can be avoided.

Alternatively or additionally, it is preferably provided that the outer part has a latching position for the needle guard in its injection position. The needle guard is then latched to carry out a safe and trouble-free injection in the injection position, so that it is held securely there, even if, for example, designed as a proportional magnet device is not energized. It results as a further advantage that due to a missing biasing element, which can be saved thanks to the controlled displaceable needle guard, and optionally thanks to the detent position in the injection position, a pressure exerted by the needle guard pressure on the skin of the patient can be reduced or even avoided altogether.

Particularly preferably, the outer part has a plurality of latching positions for the needle guard, which are arranged offset from one another along the axial direction. In this way it is possible to safely and stably arrange the needle guard in a multiplicity of different positions, even if, for example, a magnet device designed as a proportional magnet is not energized. The at least one latching position is preferably formed as a radial recess in the inner circumferential surface of the outer part and especially in a longitudinal groove which serves to guide the needle guard - or offset to this - formed. The needle guard preferably has an inherent elasticity which urges at least one projection, in particular the at least one guide projection or a latching projection, radially outward. In this case, the second magnet device, which is arranged on the needle guard, is preferably also arranged at the level of the projection so that it is displaced radially inwards against the elasticity of the needle guard when at least one of the two magnet devices is actuated. The protrusion can then be displaced out of the recess representing the detent position and displaced in the axial direction relative to the outer part and the injection part. Ends the energization, the inherent elasticity of the needle shield urges the projection radially outwards, where he can engage in a recess formed as a detent position of the outer part. In this case, the at least one locking position preferably has a run-on slope, which is designed as an insertion aid for the projection of the needle guard, so that it snaps securely into the predetermined locking position.

In a preferred embodiment of the injection device it is provided that the injection part has a guide sleeve for receiving a primary packaging means. The primary packaging means is preferably a carpule or a syringe. The first magnetic device is preferably arranged on the guide sleeve. The injection part therefore particularly preferably has the guide sleeve on the one hand and the primary packaging means arranged in the guide sleeve, in particular the carpule or the syringe, which is guided and held by the guide sleeve, on the other hand. At the same time, the primary packaging material, which typically consists of a fragile or easily damaged material, is protected by the guide sleeve. The first magnetic device is then arranged in particular on an outer surface, particularly preferably a lateral surface, of the guide sleeve. Through the guide sleeve, the entire structure of the injection device can be stabilized and designed to be particularly durable and high quality. An embodiment of the injection device is preferred as an alternative, which is characterized in that the injection part is designed as a primary packaging. In this case, the injection part is particularly preferably designed as a carpule or as a syringe. The second magnet device is in this case arranged on the primary packaging or integrated into the primary packaging. In this case, can be dispensed with a guide sleeve, so that the injection device can be constructed cheaper and easier. If the magnetic device is arranged on the primary packaging means, it can for example be glued on, attached, screwed on or fastened in another suitable manner. A magnetic device integrated into the primary packaging means can be realized, for example, by injection-molded into a base body or in co-operation therewith in a two-component injection molding process during the production of the primary packaging material. In this case, it is possible, in particular, for one of the components of the two-component injection molding process to use a magnetic component which is integrated in a suitable manner into the primary packaging material. The primary packaging material is preferably used here. least with respect to the non-magnetic component made of a plastic.

An embodiment of the injection device is also preferred, which is characterized in that it has a control device for controlling the at least one controllable magnetic device. In this way, the relative displacement of the needle guard can be controlled particularly reliably and in particular parameterizable. Particularly preferably, the control device is set up for determining the position of the needle guard relative to the injection part. In this case, a position of a further magnet, in particular a permanent magnet, relative to the proportional magnet can be determined in particular by means of a proportional magnet readily via a voltage induced in this. The position determination can be used, in particular, to check in which position the needle guard is arranged, and / or to define a maximum release length and thus in particular a maximum penetration depth of an injection needle arranged on the injection part into the body of a patient. The maximum penetration depth of the injection needle is particularly preferably parameter-dependent and / or parameterizable depending on a type of injection, where, for example, different penetration depths for patients with different body mass index (BMI) as well as for different injection types, in particular a subcutaneous, intracutaneous, Intradermal, intra-arterial, intravenous, intramuscular or other injection can be specified. In this case, the control unit can preferably be parameterized by a doctor or a user of the injection device. Particularly preferred is also an embodiment of the injection device, which is characterized in that it has no elastic element, in particular no spring element, for a bias of the needle guard in its protective position. Such an elastic element can be dispensed with, since the needle guard can be displaced on the one hand by the magnet device controlled relative to the injection part, on the other hand, it can preferably be locked at least in the protective position. Dispensing with an elastic element increases the safety of the injection device, because in case of failure of the magnetic devices no more forces act on the needle guard. This can therefore not catapulted, for example uncontrollably by the elastic element in the distal direction and in particular be thrown out. In addition, with the elastic element eliminates a relatively vulnerable wearing part, whereby the life and durability of the injection device is increased. Furthermore, a mediated by the elastic element on the needle guard otherwise applied to the skin of the patient pressure is avoided.

The object is also achieved in particular by providing a method for operating an injection device for medical purposes, whereby a relative displacement between a needle guard and an injection part equipped with an injection needle, preferably having an injection needle, injection part is controlled by at least one magnetic device angesteu- which is arranged on the needle guard or on the injection part. Within the scope of the method, an injection device according to one of the embodiments described above is particularly preferably operated. In the context of the procedure revealed the advantages that have already been explained in connection with the injection device.

In this case, a control of the relative displacement between the needle guard and the injection part includes in particular that the needle guard is held relative to the injection part in a predetermined position, that the needle guard is actively displaced relative to the injection part, and / or that a displacement of the needle guard is actively inhibited relative to the injection part. In the latter case, a counter force is preferably generated depending on the parameter, which counteracts a displacement of the needle guard, which is driven by external forces acting on this. The counterforce to be generated is preferably parameterizable in a control device of the injection device, in particular depending on a designated user of the injection device and / or an injection type.

An embodiment of the method is preferred, which is characterized in that it is checked whether an injection needle arranged on the injection part has traveled a predetermined insertion path. In the context of this embodiment of the method, it can be checked whether the injection needle has penetrated into the body of a patient with a penetration depth, which can preferably be parameterized. The penetration depth can be parameterized in particular as a function of the specific patient and / or of an injection type. In order to test the predetermined puncture path, preferably a position of an end face of the needle guard is known precisely at the level of a tip of the injection needle, the needle guard having its end face at the beginning of the injection is shifted to this known height. The injection device is then placed with the end face of the needle guard in this position on the skin of the patient. Subsequently, the injection needle is displaced into the body of the patient, wherein the needle guard is displaced in the proximal direction relative to the injection needle tip. In this case, the reaching of a predetermined end position of the needle guard can be detected, wherein the path between the known position at the level of the tip of the injection needle and the predetermined end position corresponds to the predetermined insertion path. It is possible for the needle guard to be actively held or locked at the predetermined end position so that it can be seen by the user that the predetermined penetration depth has been reached. Of course, it is also possible that the needle guard is already displaced to the predetermined end position at the beginning of the injection, in which case the injection takes place in such a way that the injection device with the injection needle is guided into the body of the patient until skin contact with the end face of the needle guard is reached becomes.

An embodiment of the method is also preferred, which is characterized in that a counterforce acting on insertion of the injection needle is influenced in a predetermined manner. It turns out that the insertion of the injection needle into body tissue of a patient always requires a certain force. In this case, according to an embodiment of the method, it is possible for the total force required for the injection to be reduced by actively shifting the needle guard back into the body tissue during the penetration of the injection needle. It then does not need additional force to shift the needle guard become. In this way, the injection for the user, in particular for a patient performing the injection itself, can be reduced. This is particularly beneficial in old and frail patients, in epileptics or even in children. Alternatively, it is provided in one embodiment of the method that the force acting on the body tissue during penetration of the injection needle is increased by generating an opposing force counteracting the displacement of the needle guard. In this way, on the one hand, the skin of the patient can be tensioned during the injection, on the other hand, it can be prevented that the injection needle is inadvertently pushed too far and in particular too vigorously into the body tissue. This embodiment of the method can be advantageously combined with a position detection, wherein the needle guard can be held or locked in particular at a predetermined end position for the penetration depth of the injection needle. The generation of a counterforce additionally causes an increased safety of the injection device, for example because children who play with the injection device can not accidentally perform an injection. An embodiment of the method is also preferred, which is characterized in that the needle guard is actively extended after the injection, that is displaced in the distal direction, in order to shift the injection needle back from an injection position. This is particularly indicative that the injection member is moved away from the body of the patient by distal displacement of the needle guard, at the same time retracting the injection needle from the body tissue of the patient. The user and, in particular, the patient receiving the injection device tion itself, then the injection needle after completion of the injection does not have to pull out of the body tissue on its own, but rather it is forced out by active displacement of the needle guard. Also, a too long residence time of the injection needle in the body of the patient can be avoided.

In a particularly preferred manner, a timing for the duration of the injection may be provided within the scope of the method. It is possible that the achievement of a maximum penetration depth of the injection needle is detected in the body tissue, after which the injection is started or at least a start of the injection is assumed. After a predetermined, in particular parameterizable, period of time, the needle guard can then be displaced distally in order to indicate an end of the injection and preferably at the same time to force the injection needle out of the body tissue. The end of the injection can also be indicated by a brief movement, in particular vibration, of the needle guard.

It is also preferred an embodiment of the method, which is characterized in that a maximum penetration depth for the injection needle is specified. This corresponds to the previously explained embodiment of the method, wherein the needle guard on reaching a predetermined end position, which defines the maximum penetration depth, is held or locked. In this case, further penetration of the injection needle into the body tissue of the patient due to the locked needle guard is no longer possible. This can avoid that the injection needle by the user accidentally too deep into the body tissue is advanced. In particular, such a violation of arranged under the intended injection site areas of the body can be avoided. It is also preferably possible that by means of a measurement of a force required for advancing the injection needle it can be detected in which part of the body tissue of the patient the injection needle is located, for example in the fat or muscle tissue. As a result, preferably an end position of the needle guard relative to the injection part in the sense of a designated injection site during the penetration of the injection needle into the skin of the patient can be determined.

An embodiment of the method is also preferred, which is characterized in that the needle guard is excited to vibrate for at least a predetermined period of time. This may be done, for example, to indicate the end of a predetermined injection period, in a manner similar to that known for electric toothbrushes to indicate a brushing time. But it is also possible that the needle guard is stimulated during penetration of the injection needle into the body tissue of the patient to vibrate in order to facilitate the penetration of the injection needle. In this case, the needle protection can be stimulated in particular to high-frequency vibrations in order to influence the properties of the body tissue and the skin in favor of the penetration of the hypodermic needle. A similar approach is known, for example, for razor blades, which can be excited to vibrate to facilitate shaving or to make it more thorough. The description of the injection device on the one hand and the method on the other hand are to be understood as complementary to one another. Features of the injection device that have been explained explicitly or implicitly in connection with the method are preferably individually or combined with one another Features of a preferred embodiment of the injection device. Method steps which have been explained explicitly or implicitly in connection with the injection device are preferably individually or combined with one another Steps of a preferred embodiment of the method. This is preferably characterized by at least one method step, which is due to at least one feature of the injection device. The injection device is preferably characterized by at least one feature, which is due to at least one step of a preferred embodiment of the method.

The invention will be explained in more detail below with reference to the drawing. Showing:

FIG. 1 is a sectional view of a first embodiment of an injection device in a first functional position;

FIG. 2 shows the embodiment of the injection device according to FIG. 1 in a second functional position;

3 shows the injection device according to Figure 1 in a third

Functional position; FIG. 4 shows the injection device according to FIG. 1 in a fourth functional position;

Figure 5 is a sectional view of a second embodiment of the injection device; and FIG. 6 is a sectional view of a third embodiment of the injection device.

1 shows a representation of a first embodiment of an injection device 1 in longitudinal section. The injection device 1 is designed for medical purposes and serves, in particular, for the injection of active substances and / or auxiliaries into body tissue of a patient. For this purpose, the injection device 1 has an injection part 3 which has an injection needle 5. Furthermore, the injection device 1 has a relative to the injection part 3 displaceable needle guard 7. In this case, a first magnetic device 9 is arranged on the injection part 3, wherein on the needle guard 7, a second magnetic device 1 1 is arranged.

The magnet devices 9, 11 are set up to effect a controlled relative displacement of the needle guard 7 relative to the injection part 3 -in the axial direction, that is, in FIG. 1 vertically. In the embodiment shown here, the first magnetic device 9 is formed as a proportional or linear magnet, where it is designed in this regard as a controllable magnetic device. The second magnetic device 1 1 is formed in the embodiment shown here as a permanent magnet, or it has a plurality of distributed along a circumferential line of the needle guard 7, arranged individual permanent magnet of which in the sectional view of Figure 1, two individual permanent magnets are shown. In a corresponding manner, it is also possible for the first magnetic device 9 to have a distributed arrangement of individual proportional or linear magnets, as seen in the circumferential direction. Particularly preferred is generally a symmetrical distribution, wherein adjacent magnets have equal angular distances from each other. Furthermore, it is preferably provided that separate permanent magnets of the second magnetic device 1 1 are aligned with corresponding separate proportional or linear magnets of the first magnetic device 9, so that a maximum magnetic overlap and thus a high efficiency of the magnetic devices 9, 1 1 can be achieved.

The injection device 1 has an outer part 13, which surrounds the injection part 3. The outer part 13 increases the operating comfort of the injection device 1 and at the same time protects the injection part 3 from damage. The needle guard 7 is guided in the outer part 13, wherein this here - viewed in the circumferential direction - distributed, arranged radial longitudinal grooves 15, wherein the needle guard a corresponding number - seen in the circumferential direction - distributed guide projections 17 has, which in the longitudinal grooves 15th to grab. In this way, a relative rotation of the needle guard 7 is prevented to the outer part 13 and preferably also to the injection part 3 about its longitudinal axis, and it is at the same time ensures a safe and stable guidance of the needle protection 7 in the outer part 13.

It is also possible as an alternative to Figure 1, an embodiment in which the first magnetic device 9 as a permanent magnet is formed, wherein the second magnetic device 1 1 is formed as a proportional or linear magnet. An electrical contacting of the second magnetic device 1 1 which can be displaced relative to the injection part 3 is then preferably effected via friction contacts, which can be provided in particular as longitudinal contacts in the guide grooves 15 of the outer part 13. Corresponding mating contacts can be arranged, for example, on the guide projections 17.

The outer part 13 preferably has at least one latching position for the needle guard 7. In the embodiment shown in Figure 1, the outer part 13 preferably has exactly one locking position for the needle guard 7, which is not shown in Figure 1. The needle guard 7 is shown arranged in its protective position in FIG. 1, in which it completely encompasses and overlaps the injection needle 5, so that inadvertent contact with it and in particular injury to a user of the injection device 1 is precluded. The latching position is preferably provided on the outer part 13 in such a way that the needle guard 7 is latched in the latching position in its position shown in FIG. 1, ie the protective position.

The at least one latching position is preferably formed as a radial recess in an inner circumferential surface 19 of the outer part 13. It is possible that a plurality of radial recesses distributed along a circumferential line - preferably in each case at the angular positions of the longitudinal grooves 15 and / or offset to this - and in particular with the guide projections 17 and / or provided with additional latching projections in alignment the radial recesses preferably engage deeper in the material of the outer part 13, as the longitudinal grooves 15. The guide projections 17 and / or latching projections can then engage in the radial recesses at the location of the detent position, so that the needle guard 7 engages here. In this case, the guide projections 17 and / or latching projections are preferably urged into the radial recesses in the absence of energization of the first magnetic device 9 by an inherent elasticity of the needle guard 7. They are pulled radially inwards when the first magnetic device 9 is energized. To ensure this, the permanent magnets of the second magnetic device 1 1 are preferably arranged at the same angular positions - seen in the circumferential direction - as the guide projections 17 and / or the latching projections, as shown in Figure 1. When the first magnetic device 9 is energized, the permanent magnets of the second magnetic device 1 1 are pulled radially inwardly in the direction of the first magnetic device 9, wherein at the same time the guide projections 17 and / or latching projections are pulled radially inward, whereby they herausverlagert from the radial recesses - the.

Particularly preferably, the at least one latching position is formed by a circumferential circumferential groove. It is particularly easy to produce in this case. At the intersection of the longitudinal grooves 15 with the annular groove radial recesses are then preferably arranged, in which the guide projections 17 can engage. Preferably, the at least one locking position on a run-on slope for the guide projections 17 and / or locking projections so that they are safely and stably urged into the at least one locking position, even if the needle guard 7 with the guide projections 17 and / or locking projections not exactly at the axial height the locking position is located. This increases the safety of the injection device 1 and leads to a defined arrangement of the needle guard 7 in a predetermined position.

In the exemplary embodiment illustrated in FIG. 1, the injection part 3 has a guide sleeve 21, which is set up to receive a primary packaging means 23, which is embodied here as a carpule 25. In particular, the carpule 25 is a double chamber carpule. The injection needle 5 is preferably detachably connected to the guide sleeve 21 for multiple use of the carpule 25 and punctures a septum 27 of the carpule 25 when the carpule 25 is inserted into the guide sleeve 21 as intended and / or the injection needle 5 is intended for the guide sleeve 21 is screwed on. The first magnetic device 9 is arranged on the guide sleeve 21 in the embodiment shown here.

Alternatively, an embodiment is possible in which the injection part 3 itself is formed as a primary packaging, in particular as a carpule or as a syringe. In this case, the first magnetic device 9 is arranged on the primary packaging means or integrated into the primary packaging means. In particular, it is possible that the primary packaging means in this case in a one-component injection molding process with insert for the first magnetic device 9, or is produced in a two-component injection molding process with a combination of plastic injection molding for a main body of the primary packaging material and metal powder injection molding for the first magnetic device 9, wherein magnetic elements of the first magnetic device 9 injected into the main body of the primary packaging material or encapsulated with the material of the base body become. The primary packaging is preferably made of plastic.

The injection device 1 preferably has a control device, not shown in the figures, for controlling the at least one controllable magnetic device 9, 11. In this case, the control device is preferably configured to determine a position of the needle guard 7 relative to the injection part 3. This is readily possible when using a proportional or linear magnet, by detecting a voltage induced by a permanent magnet displaced relative thereto.

It is important that in the injection device 1 of the needle guard 7 relative to the injection part 3 in a controlled manner displaceable or festgehaltenbar at a predetermined position by the at least one controllable magnetic device, in this case the first solenoid device 9, is controlled in a suitable manner , The mode of operation of the injection device 1 will be explained in more detail with reference to FIGS. 2 to 4.

FIG. 2 shows the exemplary embodiment of the injection device 1 according to FIG. 1 in a second functional position. Identical and functionally identical elements are provided with the same reference numerals, so that reference is made in this respect to the preceding description. The needle guard 7 is here so far - in the axial direction, ie in Direction of a symmetry or longitudinal axis of the injection device 1 - withdrawn from its protective position shown in Figure 1, that a protective cap 31 can be manually withdrawn by the user from the injection needle 5. At the same time, the position of the needle guard 7 shown in FIG. 2 is preferably a position which the needle guard 7 occupies at the beginning of an injection. An end opening 37 and in particular an end face 38 of the needle guard 7 is / are then arranged precisely at the level of a tip of the injection needle 5. Thus, on the one hand a violation of the user is excluded, on the other hand, a predetermined Einichweg ensured and / or checked when the needle guard 7 is arranged at the beginning of the injection in a defined, predetermined relative position to the injection needle 5. The corresponding position of the needle guard 7, in particular the corresponding position of the second magnet device 1 1 relative to the first magnet device 9, is preferably stored in the control unit and in particular parameterizable bar. If the injection device 1 is placed on the skin of a patient after removal of the protective cap 31 in the position of the needle guard 7 shown in FIG. 2, the opening 37 rests flush with the tip of the injection needle 5 on the skin of the patient. A relative displacement of the needle guard 7 in the proximal direction measured from this position then also indicates the puncture path of the injection needle 5 into the body tissue of the patient so that the penetration depth can be determined and compliance with a predetermined puncturing path can be checked. The relative position of the needle guard 7 relative to the injection device 3 shown in FIG. 2 is at the same time also a preferred position which the needle guard 7 assumes, so that a user can remove the protective cap 31 manually. Namely, in this position it is ensured on the one hand that the protective cap 31 can be grasped and pulled by the user, on the other hand it is ensured that the injection needle 5 does not protrude beyond the opening 37 so that the user can not accidentally injure himself on the injection needle 5 , FIG. 3 shows a representation of the first exemplary embodiment of the injection device 1 according to FIG. 1 in a third functional position. Identical and functionally identical elements are provided with the same reference numerals, so that reference is made to the preceding description. The needle guard 7 is retracted here relative to the injection part 3 and at the same time relative to the outer part 13 further in the proximal direction than in the second functional position shown in Figure 2. In this case, the injection needle protrudes beyond the opening 37, so that it can penetrate into the body tissue of a patient or may have already penetrated. It is possible that by means of the magnetic means 9, 1 1 a maximum penetration depth of the injection needle 5 is limited in the body tissue of the patient. For example, it is possible that the functional position shown in FIG. 3 corresponds to such a limited penetration depth of the injection needle 5. The needle guard 7 can then be held by means of the magnetic device 9, 1 1 in a predetermined position, for example in the position shown in Figure 3, so that further penetration of the injection needle 5 can be prevented in the body tissue. In this case, the maximum penetration depth of the injection needle 5 is preferably parameterizable and in particular stored in the control unit. It can be chosen in particular depending on the characteristics of the specific patient and / or of an injection type. For example, patients with a higher body mass index may be given a greater penetration than patients with a low body mass index. In addition, the depth of penetration can be selected depending on whether a subcutaneous, intracutaneous, intradermal, intramuscular, intraarterial or intravenous, or other injection is to be made.

FIG. 4 shows the first exemplary embodiment of the injection device 1 according to FIG. 1 in a fourth functional position. Identical and functionally identical elements are provided with the same reference numerals, so that reference is made to the preceding description. In this case, in the functional position shown in FIG. 4, the needle guard 7 is retracted to a maximum extent in the proximal direction so that, starting from the opening 37, a maximum injection length of the injection needle 5 is released.

A comparison of FIGS. 3 and 4 shows that, for example, in the case of an injection into the fatty tissue of a patient, a displacement of the needle guard 7 can be limited in the position shown in FIG. 3, so that the needle guard, upon reaching this position, is prevented by the magnet devices 9, 1 1 is held. If, on the other hand, it is to be injected deeper than into the fatty tissue, for example in the case of an intramuscular injection, the needle guard 7 can be displaced into the maximum injection position according to FIG. 4 before or during the injection. As already mentioned, the injector can tion or penetration depth, thus a predetermined Einichweg, by means of a suitable control of the magnetic means 9, 1 1 are limited, in particular in a parameterizable manner.

Alternatively or additionally, it is possible for the needle guard 7 to be actively shifted back into body tissue during penetration of the injection needle 5, so that an opposing force acting on the injection is minimized for the user. Alternatively or additionally, it is possible that during insertion of the injection needle 5 actively a counter force by means of the magnetic means 9, 1 1 is generated to prevent, for example, that the injection needle 5 is introduced too peppy and / or too far into the body tissue. Also, the skin of the patient can be stretched by such an opposing force. Furthermore, a reduction in pain can be brought about by a targeted pressure on tissue arranged around the puncture site and thus an irritation of the surroundings of the puncture site. The counterforce can also be used as a security feature, for example, to avoid injury to children playing with the injection device 1.

Alternatively or additionally, it is possible that the injection needle 5 is pushed out of the body tissue in the distal direction after active injection by active displacement of the needle guard 7. In this case, a residence time of the needle guard 7 can be parameterized in a predetermined injection position, in particular, a predetermined holding time and / or injection time can be programmed.

Alternatively or additionally, it is possible that the needle guard 7 is excited by means of the magnetic means 9, 1 1 to vibrate. This can be used, for example, to indicate one end of a predetermined injection or holding time, but the needle guard 7 can also be impressed with vibrations during the penetration of the injection needle 5 into the body tissue, thereby possibly facilitating the penetration of the injection needle 5 into the body tissue. Also a pain reduction is possible in this way.

By actively controlling the relative movement of the needle guard 7 relative to the injection part 3, it is also possible to influence a puncturing speed of the injection needle 5 into the body tissue, in particular to determine it in a parameterizable manner. Likewise, a minimum force may be determined which a patient must at least apply in order to perform the injection. This can in particular also serve to alleviate the effects of a tremor of the patient during the injection and to make the puncturing process more defined.

The injection device 1 preferably has a voltage source for supplying current to the at least one controllable magnetic device 9, 11. This can be a battery or an accumulator.

FIG. 5 shows a representation of a second exemplary embodiment of the injection device 1 in longitudinal section. Identical and functionally identical elements are provided with the same reference numerals, so that reference is made to the preceding description. In the exemplary embodiment illustrated in FIG. 5, the protective cap 31 is also removed manually by a user, for which purpose the needle guard 7 is preferably active in the embodiment shown in FIG. Position shifted so that the user can safely remove the cap 31 without touching the needle tip of the injection needle 5.

Furthermore, the second exemplary embodiment according to FIG. 5 has a plurality of detent positions 39 in comparison with the first exemplary embodiment according to FIG. 1, wherein for better clarity, only one of the detent positions is designated by the reference numeral 39 here. As already explained above in connection with the single latching position of the first exemplary embodiment of the injection device 1, not shown in FIG. 1, the latching positions 39 are here preferably designed as circumferential ring grooves, which extend radially from the inner peripheral surface 19 of the outer part 13 deeper into the material extend into it than the longitudinal grooves 15. Accordingly, at cut locations at which the longitudinal grooves 15 intersect the annular grooves of the locking position 39, radial recesses 41 are formed, in which the guide projections 17 can engage. Here, for better clarity, only one of the recesses is identified by the reference numeral 41. The annular grooves of the detent positions 39 preferably have chamfers, ie in particular chamfered edges on the inner peripheral surface 19, so that the guide projections 17 can engage securely and quickly in the detent positions 39, even if they are not arranged exactly at the axial height of the detent positions 39.

FIG. 6 shows a representation of a third exemplary embodiment of the injection device 1 in longitudinal section. Same and functional Elements are provided with the same reference numerals, so that reference is made to the preceding description. The third embodiment differs from the second exemplary embodiment according to FIG. 5 in that a syringe 43 is arranged here in the guide sleeve 21 as the primary packaging means 23, the syringe 43 itself carrying the injection needle 5. The protective cap 31 is also held on the syringe 43 here. The needle guard 7 is adapted to the geometry of the protective cap 31, in particular with regard to the distal opening 37. It is possible that the guide sleeve 21 is universally designed insofar as it can be used for both cartridges 25 and syringes 43 as a primary packaging means 23. In particular, a comparison of Figures 5 and 6 shows that this is the case in the embodiments shown here. In this case, to use a carpule 25 as primary packaging means 23, only one additional element 45 shown in FIG. 5 must be attached to the guide sleeve 21 for holding the injection needle 5.

Overall, it can be seen that both the safety and the injection comfort when using an injection device can be increased by the injection device 1 proposed here as well as the method for using an injection device.

Claims

claims 1 . Injection device (1) for medical purposes, with - An injection part (3) which is adapted to the arrangement of an injection needle (5) on the injection part (3), and - A relative to the injection part (3) displaceable needle guard (7), wherein - The injection part (3) a first magnetic means (9) and the needle guard (7) have a second magnetic means (1 1), wherein - The magnetic means (9,1 1) are arranged to effect a controlled relative displacement of the needle guard (7) relative to the injection part (3). Second injection device (1) according to claim 1, characterized in that one of the magnetic means (9.1, 1) is designed as a proportional or linear magnet, wherein preferably the other magnetic means (1 1, 9) is designed as a permanent magnet. 3. Injection device (1) according to any one of the preceding claims, characterized in that the injection device (1) has an outer part (13) which surrounds the injection part (3), wherein the needle guard (7) preferably in the outer part (13) out is. 4. Injection device (1) according to one of the preceding claims, characterized in that the outer part (13) has at least one latching position (39), preferably a plurality of latching positions (39) for the needle guard (7). 5. Injection device (1) according to one of the preceding claims, characterized in that the injection part (1) - A guide sleeve (21) for receiving a primary packaging means (23), in particular a carpule (25) or a syringe (43), wherein the first magnetic means (9) on the guide sleeve (21) is arranged, or - As a primary packaging means (23), in particular as a carpule (25) or syringe (43) is formed, wherein the first magnetic means (9) arranged on the primary packaging means (23) or in the primary packaging means (23) is integrated. 6. Injection device (1) according to one of the preceding claims, characterized by a control device for controlling the at least one controllable magnetic device (9,1 1), wherein the control device is preferably adapted for determining the position of the needle guard (6) relative to the injection part (3). , 7. A method for operating an injection device (1) for medical purposes, in particular an injection device (1) according to one of claims 1 to 6, wherein a relative displacement between a needle guard (7) and an injection part (3), which is arranged for arranging tion of an injection needle (5) on the injection part (3) is controlled by - At least one on the needle guard (7) or on the injection part (3) arranged magnetic device (9.1, 1) is driven. 8. The method according to claim 7, characterized in that it is checked whether an injection part (3) arranged injection needle (5) has traveled a predetermined insertion path. 9. The method according to any one of claims 7 and 8, character- ized in that a during insertion of the injection part (3) arranged injection needle (5) acting counterforce is influenced in a predetermined manner. 10. The method according to any one of claims 7 to 9, characterized in that the needle guard (7) is actuated after the successful injection, in order to displace the injection needle (5) arranged on the injection part (3) back from an injection position. 1 1. Method according to one of claims 7 to 10, characterized in that a maximum penetration depth for the on the injection part (3) arranged injection needle (5) is specified. 12. The method according to any one of claims 7 to 1 1, characterized in that the needle guard (7) is excited to vibrate at least for a predetermined period of time.