Device for applying fluid

Abstract

Provided is a device for applying a fluid, comprising: a cylinder (13), a piston (26) which is movable between a front position and a rear position in the cylinder (13) and connected to a piston rod (25), and a tensioning device (S) connected to the piston rod (25); wherein the tensioning device (S) has a ramp (42) which is rotatable by a motor (51) and has a ramp path (41) extending along a spiral line, wherein the tensioning device (S) also has a roller (40) which is in contact with the ramp path (41) and is rotatably mounted in a driver (31) which is connected to the piston rod (25), so that when the ramp (42) rotates in a first rotation direction (52), the ramp path (41) travels under the roller (40) which is thus rotated, wherein for the tensioning device (S), the ramp path (41) is rotated in a first rotation direction (52). During the tensioning process, the ramp path (41) rotates so that the roller (40) moves on the inclined area (44) until the second platform (45) and the piston (26) moves to the rear end position, wherein, for the dispensing process, starting from the contact of the roller (40) with the second platform (45), the ramp path (41) rotates until the roller (40) moves on the transition area (46) and, due to the tensioning, is accelerated toward the first platform (43), as a result, the piston (26) moves toward the open dispensing end (14), wherein the device (1) comprises a front part (11) and a rear part (12), wherein the front part (11) has a cylinder (13) and an open dispensing end (14), and the rear part (12) has a tensioning device (S), wherein the front part (11) and the rear part (12) are formed of different materials.

Description

Technical Field

[0001] The present invention relates to a device for administering fluids, which device can be designed as, for example, a needle-free self-filling syringe, through which liquid drugs, liquid pharmaceutical products, liquid vaccines, etc. can be administered to animals by intramuscular administration. Background Art

[0002] Such a device for administering fluids should be as light as possible so as to be able to be held by the user in one hand for a long period of time, while at the same time should allow the desired needle-free intramuscular injection. Summary of the invention

[0003] It is therefore an object of the present invention to provide such a device for administering a fluid.

[0004] The invention is defined in claim 1. Advantageous embodiments are set forth in the dependent claims.

[0005] The device for applying a fluid according to the invention comprises a cylinder with an open dispensing end, a piston, a non-return valve, and a tensioning device (Spannvorrichtung) connected to a piston rod, the piston being movable between a front position and a rear position in the cylinder and being connected to the piston rod, the piston rod protruding from the rear end of the cylinder opposite to the open dispensing end in a first direction, and a non-return valve (which serves as an outlet valve) closing the open dispensing end. The tensioning device can move the piston rod in a first direction during a tensioning process (Spannvorgang) until the piston is in its rear end position, so as to thereby fill the cylinder with the fluid to be applied and pre-tension the piston rod toward the open dispensing end (vorzuspannen). For this purpose, the device can have an attachment leading to the cylinder. For example, a hose or a container with the fluid to be applied can be fixed on the attachment and can be fixed for use of the device. Preferably, the attachment can have a non-return valve, which is designed as an inlet valve and opens during the tensioning process and closes during the fluid delivery process. Thus, the outlet valve is closed during the tensioning process and opens during the application of the fluid.

[0006] Furthermore, the tensioning device can release the piston rod during the dispensing process when the piston is in its rear end position, so that due to the existing pretensioning, the piston moves in the opposite direction to the first direction toward the open dispensing end and in the process the fluid in the cylinder is dispensed via the non-return valve for administration.

[0007] The tensioning device can have a ramp, which can be rotated by a motor and has a ramp path extending along a helical line, wherein the ramp path rises from the first platform along the inclined area to the second platform and descends from the second platform via a transition side to the first platform, wherein the ramp path has a transition area connecting the second platform and the transition side Furthermore, the tensioning device can have a roller which is in contact with the ramp path and which is rotatably mounted in a drive which is connected to the piston rod, so that when the ramp is rotated in the first rotational direction, the ramp path runs under the roller which is thus rotated. For the tensioning process, the ramp path can be rotated in the first rotational direction so that the roller runs on the inclined area until the second platform and the piston is thereby moved to its rear end position. For the dosing process, starting from the contact of the roller with the second platform, the tensioning device can rotate the ramp path in the first rotational direction until the roller runs on the transition area and is accelerated towards the first platform due to the pretensioning, as a result of which the piston moves towards the open dosing end.

[0008] The device according to the invention is preferably designed as a self-filling syringe for needle-free administration, in particular intramuscular administration, to animals and / or humans.

[0009] According to the invention, the motor can be connected to the ramp via a coupling, wherein, for rotation of the ramp, the coupling transmits a torque provided by the motor in a first rotational direction and, in the process, provides a freewheel / idle travel opposite to the first rotational direction, wherein the freewheel / idle travel is configured such that it covers at least the rotational angle range corresponding to the transition region.

[0010] The coupling can be designed so that the freewheel / idle travel covers a rotation angle range that corresponds to no more than twice the transition region. The freewheel / idle travel can in particular cover a rotation angle range that is 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90% greater than the transition region.

[0011] The coupling may have a first coupling part connected to the motor and a second coupling part connected to the ramp. One of the two coupling parts may have a protruding engagement element, and the other of the two coupling parts may have a recess into which the engagement element protrudes. The range of the engagement element in the first rotational direction may be smaller than the range of the recess in the first rotational direction by at least covering the rotational angle range of the transition region. Thus, the extension of the recess in the first rotational direction is greater than the extension of the engagement element in the first rotational direction, thereby providing the required freewheel / idle travel.

[0012] The spring may be arranged between a side surface of the engagement element and a side surface of the recess, the side surfaces being opposite each other in the first rotational direction. In particular, the spring may be arranged between all opposite side surfaces of the engagement element and the recess. The spring may be fixed to the engagement element.

[0013] The spring can be designed as a compression spring. In particular, the spring can be realized as a disc spring.

[0014] The engagement element can be designed as a strip.

[0015] The first coupling portion may have an engagement element. Furthermore, the ramp may include a base as the second coupling portion, wherein the recess is formed in the base.

[0016] One of the two coupling parts may have a plurality of protruding engagement elements that are spaced apart from each other in the first direction. The other of the two coupling parts may have a plurality of recesses into which the engagement elements protrude. The range of each engagement element in the first rotational direction is at least smaller than the range of the corresponding recess in the first rotational direction, covering the rotational angle range of the transition region.

[0017] According to the invention, the ramp path can extend on the front side of a wall extending along a circular path, wherein a cover plate is provided which engages the ramp path, the drive and the rollers and has at least one scraper extending opposite to the first direction, the scraper extending within the wall as far as the inner side of the wall so as to scrape off the lubricant located on the inner side from the inner side.

[0018] The cover may have a plurality of scrapers extending opposite to the first direction, and each scraper extends in the wall in the direction of the inner side of the wall to scrape off the lubricant located on the inner side from the inner side, wherein the scrapers are spaced apart from each other in the first direction.

[0019] The scraper may have different lengths opposite to the first direction.

[0020] Furthermore, the extent of the scraper in the direction towards the inside may be different.

[0021] One or more scrapers may be formed on the frustoconical central portion. In particular, the scrapers may extend radially from the frustoconical central portion. The frustoconical central portion may extend opposite to the first direction. In particular, the frustoconical central portion may extend up to the base of the slope.

[0022] The central part may also have any other form. In particular, the central part may be cylindrical.

[0023] According to the invention, the piston rod can be connected to the driver via a joint.

[0024] In particular, in order to form the joint, the end of the piston rod facing away from the piston can be rounded and movably mounted in the seat.

[0025] The seat may be formed on a connection which is pressed against the round end of the piston rod by a screw which is screwed into the round end of the piston rod. The seat may be formed by the bent side of a washer (or levelling washer).

[0026] Furthermore, the joint may have two washers (or levelling washers) arranged one above the other, and the mutually facing sides of the washers are curved so that the washers move against each other during rotation of the piston rod. The two washers may be provided at one side of the circular end of the connection facing away from the piston rod.

[0027] The joint can be designed as a rotational joint and / or as a joint with precisely one degree of freedom.

[0028] The joint may allow a translational movement (preferably exactly one translational movement) transversely to the longitudinal direction of the piston rod.

[0029] According to the invention, the application device can have exactly one cylinder with exactly one piston and exactly one piston rod, wherein the tensioning device has two helical screws extending parallel to one another, both of which contribute to the pretensioning that is present when the piston is in its rear end position.

[0030] The two helical springs may be arranged spaced apart from one another transversely to their longitudinal direction and / or may have the same dimensions.

[0031] In particular, the helical spring may be arranged such that the longitudinal direction of the helical spring is parallel to the longitudinal direction of the piston rod.

[0032] The helical spring can be designed as a compression spring.

[0033] The piston rod can be connected to two guide rods via a connection, wherein each guide rod extends within one of the helical springs.

[0034] The tensioning device can have at least three coil springs extending parallel to each other. In particular, the coil springs can be arranged symmetrically relative to the motor in a plane perpendicular to the longitudinal direction of the coil springs.

[0035] According to the invention, the device for applying a fluid may comprise a front part with a cylinder and an open dispensing end and a rear part with a tensioning device, wherein the front part and the rear part are formed from different materials.

[0036] The material of the front portion may include titanium, steel or plastic, and the material of the rear portion may include titanium, aluminum, magnesium or plastic.

[0037] The device may have a housing surrounding the front portion and the rear portion, wherein a portion of the front portion protrudes from the housing.

[0038] According to the invention, the device may comprise a dose setting device having a spacer and a moving unit, wherein the moving unit can move the spacer from a neutral position (in which the spacer is not positioned between the driver and the cylinder) into an operating position between the driver and the cylinder when the piston is in its rear end position, so that the driver is stopped by the spacer after the roller has passed the transition area, whereby the piston stroke during the movement of the piston towards the open dispensing end is shorter than when the spacer is in its neutral position.

[0039] The spacer may have a threaded hole into which a threaded rod projects, wherein the threaded rod is rotated to move the spacer between its neutral position and its operative position.

[0040] The spacer may be guided in such a way that it can only move in a plane perpendicular to the piston rod.

[0041] The spacer may be designed so that the roller does not contact the spacer when the drive is stopped by the spacer.

[0042] The spacer can have a first abutment area and a second abutment area for the drive, wherein, for the first abutment area, the range of the spacer along the first direction is smaller than that of the second abutment area, so that different shortenings of the piston stroke can be set depending on whether the first abutment area or the second abutment area is moved into the working position of the spacer.

[0043] Of course, the spacer may also have three or more abutment areas, wherein the range of the spacer along the first direction varies according to the abutment areas, so that different piston stroke shortenings can be set according to the abutment areas moved into the working position of the spacer.

[0044] According to the invention, the device can have a control unit which performs a measurement of a characteristic variable during the tensioning process and / or the dosing process and thereby determines, by comparison with at least one specified value, whether the tensioning process and / or the dosing process has been correctly carried out. In particular, the measurement of the characteristic variable can be carried out during the dosing process and the preceding tensioning process and thereby determines, by comparison with at least one specified value, whether both the tensioning process and the dosing process have been completed.

[0045] The current consumption of the motor, the acceleration acting on the applicator and / or the sound (or noise; eg spectrum, frequency, pitch, energy and / or volume) can be measured as characteristic variables.

[0046] A time domain expected curve of the current consumption with a lower limit and an upper limit can be predefined as at least one specified value, wherein the control unit determines that the tensioning process is correct when the current consumption measured during the entire tensioning process is not less than the lower limit and not greater than the upper limit.

[0047] A time-domain desired curve of the acceleration with an upper limit may be predefined as at least one specified value, wherein the control unit determines that the dosing process is correct when the acceleration measured during the entire dosing process is not greater than the upper limit.

[0048] The first upper expected frequency and the first lower expected frequency and / or the first upper expected amplitude and the first lower expected amplitude can be predefined as at least one specified value, wherein, when the main frequency of the measured spectrum is between the first upper expected frequency and the first lower expected frequency and / or the amplitude of the main frequency of the measured spectrum is between the first upper expected amplitude and the first lower expected amplitude, the control unit determines that the dosing process is correct.

[0049] In this case, a dominant frequency is understood to be, in particular, the frequency of the measured spectrum which has the largest amplitude. The dominant frequency is usually the frequency which determines the pitch.

[0050] The first upper desired frequency may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% greater than the predetermined first desired main frequency. In addition, the first lower desired frequency may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% less than the predetermined first desired main frequency.

[0051] The first upper desired amplitude may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% greater than the predetermined first desired main amplitude. In addition, the first lower desired amplitude may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% less than the predetermined first desired main amplitude.

[0052] In addition, the second upper expected frequency and the second lower expected frequency and / or the second upper expected amplitude and the second lower expected amplitude can be predefined as at least one specified value, wherein the control unit determines that the dosing process is correct when the first secondary frequency of the measured spectrum is between the second upper expected frequency and the second lower expected frequency and / or the amplitude of the first secondary frequency of the measured spectrum is between the second upper expected amplitude and the second lower expected amplitude.

[0053] In this case, a first secondary frequency is understood to be, in particular, the frequency in the measured spectrum which has the second highest amplitude and thus the largest amplitude after the main frequency.

[0054] The second upper desired frequency may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% greater than the predetermined first desired secondary frequency. In addition, the second lower desired frequency may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% less than the predetermined first desired secondary frequency.

[0055] The second upper desired amplitude may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% greater than the predetermined first desired secondary amplitude. In addition, the second lower desired amplitude may be 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, or 15% less than the predetermined first desired secondary amplitude.

[0056] Of course, the second, third, fourth, fifth secondary frequency and / or further secondary frequencies, whose amplitude is in each case smaller, can be measured in the same way and taken into account for the evaluation of the dosing process.

[0057] The dosing process is determined to be correct when the dominant frequency of the measured spectrum is less than the expected frequency and / or the amplitude of the dominant frequency of the measured spectrum is greater than the expected amplitude. The dominant frequency is understood here in particular to be the frequency of the measured spectrum with the largest amplitude. The dominant frequency is usually the frequency that determines the pitch.

[0058] The duration of the tensioning process can be measured as a characteristic variable.

[0059] The first expected duration may be predefined as a specified value, wherein the control unit determines that the tensioning process is correct when the measured duration is greater than the first expected duration.

[0060] The second expected duration may be predefined as a specified value, wherein the control unit determines that the tensioning process is correct when the measured duration is smaller than the second expected duration.

[0061] Furthermore, the rotation angle covered by the ramp path in the first rotation direction during the tensioning process can be measured as a characteristic variable.

[0062] The desired rotation angle may be predefined as a specified value, wherein the control unit determines that the tensioning process is correct when the measured covered rotation angle is greater than the desired rotation angle.

[0063] It is understood that the features mentioned above and the features still to be explained below can be used not only in the combination specified but also in other combinations or alone without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The present invention is explained in more detail below with the aid of exemplary embodiments and with reference to the accompanying drawings, which also disclose features important to the present invention. These exemplary embodiments are merely illustrative and should not be construed as restrictive. For example, the description of an exemplary embodiment with multiple elements or components should not be construed to mean that all of these elements or components are necessary for implementation. On the contrary, other exemplary embodiments may also include alternative elements and components, fewer elements or components, or additional elements or components. Unless otherwise stated, elements or components of different exemplary embodiments may be combined with each other. Modifications and variations described for one of the exemplary embodiments may also be applicable to other exemplary embodiments. In order to avoid repetition, the same elements or corresponding elements in different figures are represented by the same reference numerals and are not repeatedly explained. Among them:

[0065] Figure 1 A perspective view of an exemplary embodiment of an applicator 1 according to the invention is shown.

[0066] Figure 2 A front view of the cylinder / piston arrangement 10 of the applicator 1 is shown.

[0067] Figure 3 The cylinder / piston assembly 10 is shown along Figure 2 Section view of section line AA in.

[0068] Figure 4 The cylinder / piston assembly 10 is shown along Figure 3 Section view along section line BB.

[0069] Figure 5 The cylinder / piston assembly 10 is shown along Figure 4 Section view along section line CC in .

[0070] Figure 6 An isometric view of the cylinder / piston arrangement 10 is shown with the arrangement tensioned and the piston in its rear end position.

[0071] Figure 7 An isometric view of the cylinder / piston arrangement 10 is shown with the piston in its front end position.

[0072] Figure 8 A diagram is shown for illustrating the profile of the ramp path 41 , wherein the rotation angle α is plotted along the x-axis and the travel of the longitudinal axis of the piston rod 25 is plotted along the y-axis.

[0073] Fig. 9 Shown according to Figure 6 sectional view of the piston / cylinder arrangement 10 in a tensioned state.

[0074] Fig.10 A front view of the piston / cylinder arrangement 10 is shown, wherein the piston is in its front end position.

[0075] Fig.11 The piston / cylinder assembly 10 is shown along Fig.10 Sectional view along section line DD.

[0076] Figure 12A-12C A diagram is shown for explaining the forces when the roller 40 travels over the transition region 46 towards the transition side 47 .

[0077] Fig.13 A front view of the base 60 of the ramp 42 is shown.

[0078] Fig.14 A perspective view showing the coupling portion 66 connected to the motor 51 for articulated rotation.

[0079] Fig.15 A side view of the coupling portion 66 is shown.

[0080] Fig.16 A front view of the coupling portion 66 is shown.

[0081] Fig.17 A front view showing the coupling portion 66 inserted into the recess 61 of the base 60 .

[0082] Fig.18 and 19 Shown according to Fig.17 , used to explain the free wheel / idle travel provided by coupling 50.

[0083] Fig. 20 A schematic front view showing the spatial arrangement of springs 32 , 33 and motor 51 is shown.

[0084] Fig.21 A comparative diagram showing the spring and motor arrangements of prior art applicators.

[0085] Fig. 22 and Fig.23 Further views showing other exemplary embodiments of the spatial arrangement of springs and motors in an applicator 1 according to the invention.

[0086] Fig.24 The illustration shows the front part 11 and the rear part 12 in the connected state.

[0087] Fig.25 A diagram showing the front part 11 and the rear part 12 in a non-connected state.

[0088] Fig.26 An enlarged detail view of the dose setting device 36 is shown.

[0089] Fig.27A A perspective view of the spacer 70 is shown.

[0090] Fig.27B A schematic diagram of another exemplary embodiment of a spacer 70 is shown.

[0091] Fig.28 A perspective view of the cover 35 is shown.

[0092] Fig.29 A front view of the cover 35 is shown.

[0093] Fig.30 Shown along Fig.29 Cross-sectional view along section line BB.

[0094] Fig.31 Shown along Fig.29 Section view of section line AA.

[0095] Fig.32 A front view of the cover 31 is shown.

[0096] Fig.33 The edge of the cover 35 is shown Fig.32 Cross-sectional view along section line CC.

[0097] Fig.34 An enlarged partial view of the front part 11 together with a part of the piston 26 and the piston rod 25 is shown.

[0098] Fig.35 A schematic cross-sectional view of an insert 96 for the nozzle 16 is shown.

[0099] Fig.36 A schematic cross-sectional view of the piston rod 25 , the plate 28 and the guide rods 29 and 30 and the springs 32 and 33 is shown.

[0100] Fig.37 Shows Fig.36 Enlarged view of detail A.

[0101] Fig.38 and Fig.39 A diagram is shown with measured values ​​of acceleration values ​​measured during the tensioning process and the dosing process.

[0102] Fig.40 and Fig.41 A diagram is shown with measured values ​​for the current consumption of the motor 51 measured during the tensioning process and the dosing process. DETAILED DESCRIPTION

[0103] exist Figure 1 In the exemplary embodiment shown, the device 1 for applying a fluid (e.g., a liquid) according to the present invention comprises a housing 2 having a body portion 3 and a handle portion 4. The handle portion 4 is designed so that a user can hold the device 1 by gripping the handle portion. In addition, the handle portion 4 has a trigger 5 for actuating the device. A dispensing area 6 is formed at the front end of the body portion 3. In addition, at the top area of ​​the body portion 3, the device 1 has an attachment 7, to which a hose or a container, for example, can be connected. The fluid to be applied can be transported by the hose. Similarly, the fluid to be applied can be kept in the container.

[0104] At the end of the handle portion 4 facing away from the body portion 3, the handle portion 4 transitions into a base portion 8 in which, for example, a power source for the device 1, such as a battery, may be accommodated.

[0105] In the exemplary embodiment described here, the device 1 according to the present invention (also referred to as the administration device 1) is designed for needle-free administration of fluids into animals. The administration preferably involves intramuscular injection of fluids, for example, the fluids may be pharmaceutical products, vaccines, etc.

[0106] The application device 1 has a cylinder / piston arrangement 10 ( Figure 3 and Figure 4 ) and is of the self-filling type, whereby the movement of the piston towards the dosing area 6 causes the discharge of the fluid, and the opposite movement of the piston causes the cylinder to be filled with fluid for the next discharge process.

[0107] Figures 2 to 5 The entire cylinder / piston arrangement 10 is shown without the housing 2. The cylinder / piston arrangement 10 comprises a front part 11 and a rear part 12 connected to the front part. The front part 11 comprises a cylinder 13 for receiving a fluid, the cylinder 13 having an open dispensing end 14 in which a non-return valve 15 is located, the non-return valve being fluidically connected to a nozzle 16. Fig.34 The non-return valve 15 can also be clearly seen in the illustration of FIG. 1 and is designed to allow fluid to be dispensed from the cylinder 13 via the non-return valve 15 and the nozzle 16. It is not possible to suck in air or liquid via the nozzle and the non-return valve 15. The non-return valve 15 is closed in this direction.

[0108] An attachment 7 is also formed at the front portion 11, in which a check valve 20 ( Figure 3), the check valve allows fluid connection from the attachment 7 to the cylinder 13 and prevents fluid connection in the opposite direction. The attachment 7 has a channel 21, which leads to the cylinder 13 through a plurality of radial holes 22.

[0109] The further non-return valve 20 can therefore be referred to as an inlet valve and the non-return valve 15 can be referred to as an outlet valve.

[0110] The piston rod 25 is formed with a piston 26 at its end pointing toward the open dispensing end 14 and is guided in the cylinder 13, wherein the piston 26 is formed in the cylinder 13. Figure 3 and Figure 4 In the cross-sectional view of , it is in its rear end position. In this position, cylinder 13 is full of the fluid to be dispensed.

[0111] The rear end 27 of the piston rod 25, which points away from the open dispensing end 14, is Fig.37 2) are connected to a first guide rod 29 and a second guide rod 30 extending parallel to each other and parallel to the piston rod 25 by a plate 28, and the first guide rod and the second guide rod are guided in the rear part 12 ( Figure 4 The ends of the guide rods 29 and 30 facing away from the plate 28 are connected to a drive 31 .

[0112] In addition, a compression spring 32, 33 (for example, a helical spring) is provided for each guide rod 29, 30, the front ends of the compression springs 32, 33 being supported on the plate 28 respectively, and the rear ends thereof being supported on a stopper 34 of the rear part 12 respectively. Figure 3 and Figure 4 In the position of the piston 26 shown, the springs 32 , 33 are tensioned.

[0113] A cover 35 and a dose setting device 36 are provided at the rear end of the rear portion 12. The cover and the dose setting device are arranged according to Figure 6 The isometric view of the cylinder / piston arrangement 10 is not shown in order to clearly identify the drive 31 . The drive 31 has a rotatably mounted roller 40 , wherein the axis of rotation of the roller 40 extends substantially perpendicularly to the longitudinal axis of the piston rod 25 .

[0114] The roller 40 travels on a ramp path 41 of a ramp 42 which rotates below the roller 40, wherein the ramp path 41 has a single turn, in particular as Figures 6 to 8 shown.

[0115] exist Figure 8 In FIG. 1 , the rotation angle α is plotted with reference to the pitch difference z parallel to the longitudinal direction of the piston rod 25, wherein it is assumed that at the rotation angle α0=0°, there is a minimum pitch height z0 and the piston 26 is therefore in a front position in which the distance to the open dispensing end 14 is minimum. This position of the piston 26 is, for example, in accordance with Fig.11 is shown in a cross-sectional view.

[0116] The ramp path 41 has a lower platform 43, which is adjoined by an inclined region 44, which extends to an upper platform 45. The upper platform 45 is adjoined by a transition region 46, which merges into a transition flank 47 (rotation angle α1), which in turn leads to the first platform 43. The rotation angle range from α0 to α2 is therefore equal to 360°.

[0117] The transition side 47 is characterized in that it extends almost vertically, because it extends from the height z1 to the height z0 at a rotation angle (here α2). The transition region 46 is therefore the rotation angle range in which the height z1 decreases continuously from the upper platform 45 until the rotation angle α2 (= transition side 47) is reached. The rotation angle range from α1 to α2 therefore covers the transition region 46.

[0118] The ramp 42 is connected to the motor 51 through the coupling 50 ( Figure 3 ), the motor 51 rotates in a first direction 52 ( Figure 6 and 7 ) to rotate the ramp 42. If the cylinder / piston assembly 10 is tensioned Figure 6 Starting from the position shown in , the motor 51 now rotates the ramp 42 further in the first rotational direction 52 (because the user has actuated the trigger 5), and due to the tensioned compression springs 32 and 33, the plate 28 accelerates in the direction of the open dispensing end 14, the roller 40 runs on the transition area 46 and then descends along the transition side 47 in the direction of the lower platform 43, whereby the piston rod 25 connected to the plate 28 is also moved in the direction of the open dispensing end 14, and the fluid contained in the cylinder 13 is then discharged via the non-return valve 15 and the nozzle 16 for intramuscular injection into the animal. The administration device 1 is designed so that the fluid passes safely through the skin and is administered into the muscle located below the skin. The piston 26 is then in its front position, for example as Fig.11 . The dispensing device 1 is preferably configured such that in the front end position of the piston 26, the driver 31 bears on the rear end of the rear part 12, so that the rear end of the rear part 12 forms an abutment of the driver 31. In this position, there is still a desired minimum distance between the roller 40 and the ramp path 41, so that the roller 40 does not reach the lower platform 43 of the ramp path 41. It is thus possible to prevent the roller 40 from hitting the ramp path 41 at the end of the discharge process, which could damage the roller 40.

[0119] After the discharge process, the ramp 42 is rotated again in the first rotational direction 52 by means of the motor 51, so that as soon as the roller 40 comes into contact with the ramp path 41 in the inclined region 44, further rotation has the effect that the drive 31 moves away from the open dispensing end 14 in the longitudinal direction of the piston rod 25, whereby the compression springs 32, 33 are tensioned again and reach their maximum tension when the roller 40 reaches the upper platform 45. Due to the mechanical connection of the drive 31 to the guide rods 29 and 30, the plate 28 and the piston rod 25, this movement of the drive 31 has the effect that the piston rod 25 and thus the piston 26 also move in the direction away from the open dispensing end in the cylinder 13, so that a negative pressure is built up. As soon as the negative pressure that has built up is so great that the inlet valve 20 opens, the fluid is sucked into the cylinder 13 through the inlet valve 20 and the radial holes 22, so that the cylinder 13 is filled with fluid.

[0120] When the roller 40 (also called cam or roller) reaches the upper platform 45 , the motor 51 stops, so that the cylinder / piston device 10 is tensioned and the dosing device 1 is thus ready for the next injection process, which can be performed by actuating the trigger 5 .

[0121] The plate 28 , the springs 32 , 33 and the guide rods 29 , 30 , the drive 31 with the roller 40 and the ramp 42 together with the motor 51 and the coupling 50 form a tensioning device S for tensioning the cylinder / piston arrangement 10 .

[0122] The application device 1 further comprises a control unit 54 for controlling the motor 51 and all other electrical components of the device 1 . Figure 3 A printed circuit board with a control unit 54 is shown.

[0123] As already described, to administer the fluid, Figure 6 Starting from the rotational position of the ramp 42 shown in FIG. 5 , the ramp is further rotated in the first rotational direction 52 so that the roller 40 travels from the upper platform 45 through the transition area 46, and then accelerates along the transition flank 47 toward the lower platform 53. However, when the roller travels on the transition area 46, there are difficulties ( Figures 12A-12C), in addition to the tangential component Ft, the tensioning springs 32, 33 also have a component Fs which is perpendicular to the tangential component and includes a component Fd which points in the same direction as the force Fm of the motor for rotating the ramp 42. As a result, the roller 40 running over the transition region 46 accelerates the rotation of the ramp 42 (in addition to the rotation caused by the motor 51). This can disadvantageously cause the motor 51 to act as a generator for this additional acceleration and to generate voltage peaks which can damage the control electronics of the control unit 54. Furthermore, the motor 51 thereby acts as a brake and thus generates an undesirable braking effect during the rotation of the ramp 42, which in turn changes the pressure distribution in an undesirable manner during application.

[0124] Therefore, the coupling 50 is designed to transmit the torque provided by the motor 51 to rotate the ramp path 41 in a first rotational direction 52, while having a freewheel / idle travel opposite to the first rotational direction 52, the freewheel / idle travel being constructed so that the freewheel / idle travel covers at least the rotational angle range corresponding to the transition region 46 (from α1 to α2), here for example 7°.

[0125] In order to form the coupling 50, a star-shaped recess 61 is formed in the base 60 of the ramp 42 ( Fig.13 ). The star-shaped recess 61 comprises a central part 62 and four arms 63 which extend from the central part and are in each case spaced 90° apart from one another in the circumferential direction. Fig.13 One of the arms 63 is schematically shown, the side surfaces 64 , 65 of which are inclined relative to one another such that they enclose an angle β which corresponds at least to the rotation angle of the transition region 46 and is therefore 7° here.

[0126] Furthermore, the coupling 50 comprises a coupling part 66 which is connected to the motor and has four walls 67 which are arranged in a star-shaped manner and are in each case spaced 90° from one another in the circumferential direction. A spring 69, here a disc spring, is arranged on each side surface 68 of each wall. The springs 69 serve to support the movement and for damping. Fig.17 As shown in the front view of the coupling 66, the wall 67 of the star-shaped profile is inserted into the star-shaped recess 61 of the base 60 of the ramp 42. If the torque is not transmitted through the coupling 50, each wall 67 is centered in the corresponding arm 63 of the star-shaped recess 61 due to the spring 69.

[0127] If the roller 40 is rotated in the first rotational direction 52 by the motor 51, the front side 68 viewed in the first rotational direction 52 abuts against the corresponding side 64 of each arm 63, as shown in FIG. Fig.18 shown.

[0128] If, starting from the upper platform 45, the roller 40 runs over the transition region 46, the described spring force (here the component Fd) additionally accelerates the ramp 42 in the first rotational direction 52, so that due to the provided freewheel / idle travel the ramp 42 can rotate faster in the first rotational direction 52 than the coupling 66 to the motor 51. Fig.19 As shown, the freewheel / idle travel stops as soon as the rear side surface 68 of the corresponding wall 67, seen in the first rotational direction 52, abuts against the side surface 65 of the corresponding arm 63 of the star-shaped recess 61. Since the freewheel / idle travel is designed so that it covers at least the entire transition region 46, once the freewheel / idle travel occurs according to Fig.19 The roller 40 moves over the entire transition region 46. The roller 40 can therefore move freely along the transition side 47, and an undesirable acceleration of the rotational movement of the motor 51 when the roller travels on the transition region 46 is reliably avoided.

[0129] Fig. 20 A schematic front view is shown, which shows the spatial arrangement of the springs 32 and 33 and the motor 51. The two springs 32 and 33 are connected in parallel via the plate 28 so that their spring stiffnesses (spring constants) are added. Thus, when the piston 26 is in its rear end position, the required force (spring force) can be provided, which is necessary to accelerate the piston 26 so much that the fluid to be administered can be administered intramuscularly into the animal. At the same time, the required construction space for the cylinder / piston arrangement 10 can be kept small and compact. Fig.21 Compared to the illustration in which only one spring 32 ′ is provided instead of two springs 32 and 33 , this results in a larger construction space for the corresponding cylinder / piston arrangement 10 ′, since the single spring must have a larger diameter in order to provide the same spring force.

[0130] Of course, more than two springs 32, 33 may be connected in parallel. Fig. 22 and Fig.23 As can be seen from the schematic diagram of , for example, three or four springs 32, 33, 37 and optionally 38 can be provided to achieve a compact structure. Fig. 22 and Fig.23 As shown, more than two springs (here three or four springs) may preferably be arranged symmetrically relative to the motor 51 .

[0131] As already explained, the front part 11 and the rear part 12 are two separate parts connected to each other. Fig.24 and Fig.25 This can also be clearly seen in the diagram.

[0132] The front portion 11 and the rear portion 12 are preferably formed of different materials. Figure 1 ), therefore a material is selected for it which has, for example, a greater strength than the material of the rear part and / or a material which has a better medium stability than the material of the rear part 12.

[0133] The material of the front part 11 may therefore comprise titanium, steel or plastic (eg PEEK).

[0134] For the material of the rear part 12, in particular, a material with the lightest weight possible is selected. Aluminum, magnesium, titanium or plastic is preferred here.

[0135] Especially in Fig.26 and Fig.27A As can be seen in the enlarged detailed cross-sectional view in FIG. 3 , the dose setting device 36 comprises a spacer 70 into which a screw 71 is screwed, the screw 71 being coupled to a shaft 74 of a second motor 75 via first and second gears 72, 73. The screw 71 is screwed into the spacer 70 ( Figure 3 ) in the threaded hole 76. In addition, the spacer 70 includes two laterally protruding guide strips 77, 78 ( Fig.27A ). The guide strips 77, 78 are guided in the guide grooves 79 of the cover 35. The guide grooves 79 can be Fig.28 In addition, the cover 35 includes an opening 80 through which the spacer 70 can be moved.

[0136] In accordance with Figure 3 In the illustration of , the spacer 70 is in a neutral position in which it does not affect the return movement of the roller 40 and thus the drive 31 from the upper platform 45 through the transition region 46 along the transition side 47 toward the lower platform 43. In contrast, in Fig.26 , the spacer 70 has been moved into its working position, in which it is positioned between the driver 31 and the rear end of the rear part 12 in such a way that it forms a stop for the driver 31. Figure 3 Shown location to Fig.26 The movement of the positions shown is produced by the rotation of the shaft 74, wherein, for example, a rightward rotation of the shaft 74 causes the Figure 3 Shown location to Figure 6 The movement of the spacer 70 to the position shown, and the left rotation of the shaft 74 causes the opposite movement. Of course, the dose setting device 36 can also be configured in such a way that the opposite direction of rotation causes the same movement. It is important here that by means of the second motor 75, the two gears 72 and 73 and therefore the shaft 74 can be rotated so as to convert the rotational movement into a translational movement of the spacer 70 perpendicular to the longitudinal direction of the piston rod 25. Thus, the spacer 70 can be moved back and forth between its working position and its neutral position.

[0137] If the spacer 70 is now in Fig.26 4. If the roller 40 is in the working position shown, the movement of the driver 31 in the longitudinal direction of the piston rod 25 is shortened after the roller 40 has passed the transition region 46, because the movement ends when the driver 31 abuts against the spacer 70. The extent of the spacer 70 in the longitudinal direction of the piston rod 25 thus corresponds to the shortening of the piston stroke during the administration of the fluid located in the cylinder 13. Thus, a smaller amount of fluid can be discharged, as a result of which two different doses (here, for example, 2 ml and 1 ml) can be administered with the application device 1. If the roller 40 is on the upper platform 45, all that needs to be done if the dose is to be changed is to bring the spacer 70 into contact with the piston rod 25. Fig.26 Its working position is shown.

[0138] The spacer 70 is designed so that when the driver 31 rests thereon, the roller 40 does not contact the spacer 70. This prevents the roller 40 from being damaged by the spacer 70 when the driver 31 stops.

[0139] As already described, using Fig.27A The described spacers thus make it possible to provide for individual smaller doses. Fig.27B The variation of the spacer 70 is shown. Since the spacer 70 has a first abutting area 140 and a second abutting area 141, the first abutting area 140 and the second abutting area 141 are connected along the first direction ( Fig.27B The range (Ausdehnung) of the spacer 70 (from left to right in the figure) is different, so that two different smaller doses can be set. Since this range corresponds to the reduction of the stroke of the piston 26 during the application process, two different reductions in the dose are possible. If the distance piece 70 is retracted between the driver 31 and the rear end of the rear part 12 to such an extent that the driver 31 is stopped by the part 140 during the application process, a first reduction in the piston stroke is produced. If, on the other hand, the distance piece 70 is retracted to such an extent that the driver 31 is abutted against the area 141 during the application process, a second reduction in the piston stroke is produced, which is greater than the reduction by the part 140. This stepped design of the spacer 70 thus makes it possible to set two different dose reductions.

[0140] For example, Fig.28 As can be clearly seen in FIG. 1 , the cover 35 includes first, second and third scrapers 80, 81, 82, which are arranged according to Figure 3 In the assembled state, the cover 35 extends from the rear end thereof in the direction toward the dispensing end of the application device 1. Fig.28 As can be seen in FIG. 8 , the scrapers 80 - 82 are formed on a frustoconical central portion 83 and are spaced apart from each other in the circumferential direction. Figure 3 As shown, the frustoconical central portion 83 tapers in the direction towards the dispensing end.

[0141] In the assembled state, the frustoconical central portion 83 extends up to the base 60 of the ramp 41. In the same way, the first scraper 80 extends up to the base 60. The first scraper 80 extends radially up to the inner side 84 of the wall 85, on the end side / front surface of which the ramp path 42 ( Figure 6 ).

[0142] The second scraper 81 is shorter in both the axial direction and the radial direction than the first scraper 80. Likewise, the third scraper 82 is shorter in both the radial direction and the axial direction than the second scraper 81.

[0143] Furthermore, the cover 35 comprises an intermediate wall 86 in which a groove extending in the axial direction is formed, in which the roller 40 together with the holding part of the driver 31 can move in the axial direction. In addition, in the assembled state, the intermediate wall 86 surrounds the outer side 89 of the wall 85 together with the lower cover part 88. A lubricant (for example, grease) is provided in the said remaining space between the cover 35 and the wall 85, with which the roller 40 is rotated as smoothly as possible and guided on the ramp path 41 with as little friction as possible. With the help of the scrapers 80 to 82, due to the relative movement between the ramp 41 and the scrapers 80-82, the grease that does not remain on the ramp 41 is moved again in the direction of the ramp and the roller 40, so that permanent lubrication can be ensured. The lubricant accumulated at the bottom of the cover 35 is thus transported again to the ramp path 41 and the roller 40, so that the required permanent lubrication is ensured.

[0144] Fig.34 1 is an enlarged sectional view showing the front part 11 together with the piston 26 and part of the piston rod 25. The cylinder 13 has an annular groove 90 in its rear region (facing away from the open dispensing end 14). An O-ring 91 or a sealing ring 91 (e.g. an elastomeric seal) is inserted for sealing purposes. In addition, a first and a second support ring (92, 93) are arranged in the recess 90 so that the sealing ring 91 is located between the two support rings 92 and 93. The groove 90 and the support rings 92 and 93 are dimensioned so that the gap between the support rings 92 and 93 and the piston rod 25 is smaller than the gap between the inner side of the cylinder 13 and the piston rod 25. The support ring made of polytetrafluoroethylene or other plastics reliably prevents a part of the sealing ring 91 from being squeezed into the gap between the piston rod 25 and the inner side of the cylinder 13 due to the pressure or negative pressure generated during the movement of the piston rod 95 (which would destroy the sealing ring 91).

[0145] The second support ring 93 prevents the described gap squeezing during the movement of the piston rod 25 towards the open dispensing end 14 and thus during the application of the fluid. The first support ring 92 prevents undesired gap squeezing during the reverse movement and thus during the filling of the cylinder 13 with fluid.

[0146] like Fig.34As can be seen in FIG. 1 , the nozzle 16 has a tapered through hole 95 through which the fluid is dispensed during application. The required through hole 95 can also be formed in the insert 96, such as Fig.35 As shown, the insert is then screwed into the remaining main nozzle body 97. The insert 96 comprises a base body 98 with external threads, which comprises a receiving area 99 at the distal end. A sapphire element 100 is inserted into the receiving area 99, in which the last part of the through hole 95 is formed. Fig.35 As can be seen in the illustration of , the diameter of the last part of the through hole 95 is the smallest or smaller than the diameter of those parts of the through hole 95 formed in the substrate 98. It is thus advantageously achieved that the desired very small diameter of the through hole 95 can be reliably produced at its distal end, because this part of the through hole 95 in the sapphire element 100 can be manufactured more accurately than the hole in the substrate 98 made of metal. The diameter of the last part of the through hole 95 in the sapphire element 100 can be in the range of 0.30 to 0.38 mm, for example, with the intention that the manufacturing tolerance is not greater than 0.02 mm.

[0147] Since the unit consisting of the piston rod 26, the plate 28 and the guide rods 29, 30 is relatively long and great forces act during the application of the fluid, it must be ensured that the piston rod 26 can move freely in the cylinder 13 and, for example, does not move tilted. For this purpose, the piston rod 26 should be oriented, for example, as parallel as possible to the guide rods 29, 30, and this condition should also be maintained for a long time during the use of the application device 1.

[0148] The piston rod 25 is therefore not absolutely rigidly connected to the plate 28. The connection is configured such that the piston rod 26 can be tilted or rotated or positioned relative to the plate 28. The piston rod 25 is therefore connected to the plate 28 via a swivel joint. Fig.36 and Fig.39 As can be seen from the illustration of , a first washer 110 is arranged between the rear end 27 of the piston rod 25 and the plate 28. In addition, a fixing screw 111 extending through a corresponding hole in the plate 28 is screwed into the rear end 27. The second and third washers 113, 114 are arranged between the heads 112 of the fixing screws 111. In order to provide the required rotatability, the rear end 27 is rounded (here, for example, spherical), and the side of the first washer 110 facing the rear end 27 is correspondingly concave, so that this side forms a receiving portion for the rear end 27. From Fig.37 As can be seen from the illustration in , the first washer 110 is located in the recess of the plate 28, so that the first washer 110 cannot move laterally relative to the longitudinal direction of the piston rod 25. The side of the first washer 110 facing away from the rear end 27 is flat, because the bottom of the corresponding recess in the plate 28 is also flat. Therefore, the first washer can also be called flat concave.

[0149] The second and third washers 113 and 114 are designed so that the sides facing each other are also curved. In this case, the side of the second washer 113 facing the third washer 114 has a convex curvature. The side of the third washer 114 opposite to the second washer 113 is correspondingly concavely curved. The other sides of the second and third washers 113, 114 are flat. The head 112 of the fixing screw 111 presses the third washer 114 onto the second washer 113, thereby pressing the second washer 113 onto the side of the plate 28 facing away from the rear end 27. Therefore, the second washer 113 is flat-convex, while the third washer 114 is flat-concave.

[0150] By virtue of the selected dimensions and curvature, the rotation point 115 for the piston rod 25 to rotate relative to the plate 28 is spaced apart from the plate 28 and is at the side of the screw head 112 .

[0151] Since the described connection allows the piston rod 25 to rotate relative to the plate 28, it is ensured that the piston rod 25 can always move in the cylinder 13 without becoming wedged.

[0152] The motor 51 can be designed as an electric motor and in particular as a brushless electric motor. The durability of the application device 1 is thereby improved, since in the case of a brushed motor difficulties can arise in that the brushes can break due to vibrations occurring during the application of the fluid.

[0153] In order to identify Figure 3 In order to determine whether there is fluid in the cylinder 13 at the position of the piston 26 shown, a sensor 55 is provided, which in the exemplary embodiment described here is arranged upstream of the further non-return valve 20 (which can also be referred to as an inlet valve). The sensor 55 can, for example, distinguish between air and liquid, so that it can be avoided that the application device 1 performs an application process without liquid in the cylinder 13. Damage to the application device 1 can thus be prevented, since the application device is designed such that the liquid inhibits the movement of the piston rod 25 or the piston 26 towards the open dispensing end during application. If there is no liquid in the cylinder 13, the inhibition function is omitted, as a result of which mechanical damage to, for example, the piston rod 25, the connection of the piston rod 25 to the plate 28 or the guide rods 29, 30 can occur. The sensor 55 can be designed as a voltage sensor, a capacitive sensor or, for example, as a light barrier.

[0154] The housing 2 may have a light emitting area 120 ( Figure 1). The area 120 may be, for example, in the form of a bar or may have any other form. Different colors may be used to share user information about the state of the application device 1. For example, a first color (e.g., red) may be used to share with the user that the device 1 is not yet ready for use. A second color may be used to share that the device is substantially ready to work. A third color may be used to indicate that the cylinder / piston device 10 is tensioned and that the application process may be performed by actuation of the trigger 5. A fourth color (e.g., green) may be used to share with the user that the application process was successful. Furthermore, other colors may be used to share with the user that an error state exists. Of course, the information described may be shared not only by different colors, but may also be shared by the same color if the difference is represented, for example, by flashing in a different manner. Furthermore, tactile feedback or acoustic feedback may be provided to the user instead of the visual feedback described. Of course, visual, tactile and auditory feedback may also be combined.

[0155] Furthermore, the application device 1 may have an acceleration sensor 130, which is shown only as an example. Figure 3 Since the measured acceleration value of a correct application process is different from the acceleration value of an incorrect application process, it can be determined whether the application process is successful based on the measured value. Fig.38 In the diagram, the measured acceleration values ​​of a successful application process are plotted over time along the x-axis (in ms) along the y-axis in g (=gravitational acceleration). The measured acceleration values ​​are depicted as points connected by a line. The test curve is represented by a dashed line. If the acceleration value is below the value of the test curve, a successful application process is determined.

[0156] Fig.39 An example of an unsuccessful administration process (hereinafter also referred to as an injection) is shown. The acceleration value exceeds the maximum value of the test curve and should therefore be assumed to be an unsuccessful injection.

[0157] Furthermore, the current consumption of the motor 51 can be measured and evaluated in order to assess the quality of the injection.

[0158] Fig.40 The measured current consumption of a dosing and injection process of the application device 1 is shown, wherein the measured current values ​​in A (= ampere) are shown as points connected by a line. The current values ​​are plotted along the y-axis (over time along the x-axis in ms). As long as the measured current value is less than the upper limit value curve and greater than the lower limit value curve (both curves are represented by dashed lines), the dosing and injection process is successful.

[0159] If the injection is unsuccessful, the measured current value is outside the range defined by the two limit curves, such as Fig.41 In this case, the administration process was unsuccessful.

[0160] Instead of or in addition to the acceleration sensor 130, a sensor 131 for measuring sound or tone (eg, a microphone) may be provided. Figure 3 . For example, based on the tone during the dosing process, it can be determined whether the application process is successful. If the time curve of the measured tone is, for example, above a predetermined upper limit or the time curve of an upper limit, the application process is evaluated as unsuccessful. The time curve of the measured tone may also fall below the time curve of a lower limit, for example, which may lead to the conclusion that the application process is wrong. For example, the measured spectrum can also be evaluated as a characteristic variable, which must follow the expected time curve in order to evaluate the application process as successful. In the same way, the time curve of the intensity (or volume) can be used as a characteristic variable, which in turn must follow the expected time curve.

[0161] Of course, a plurality of the characteristic variables described can also be used to evaluate the application process. For example, only the dosing process, only the tensioning process or both the tensioning process and the dosing process can be measured and evaluated here.

[0162] The control unit 54 can perform the described measurement and evaluation of the characteristic variables in order to determine whether the application process is successful. Depending on the determination process, the control unit can generate visual feedback, tactile feedback and / or auditory feedback, for example, in the described manner.

Claims

1. A device for applying a fluid, comprising: a cylinder (13) having an open dispensing end (14), a piston (26) movable between a front end position and a rear end position in the cylinder (13) and connected to a piston rod (25) projecting in a first direction from a rear end of the cylinder (13) opposite to the open dispensing end (14), a non-return valve (15) which closes the open dispensing end, and A tensioning device (S), the tensioning device being connected to the piston rod (25); wherein the tensioning device (S) is capable of moving the piston rod (25) in a first direction during tensioning until the piston (26) is in its rear end position, thereby filling the cylinder (13) with the fluid to be applied and pre-tensioning the piston rod (25) towards the open dispensing end (14), and wherein, when the piston (26) is in its rear end position, the tensioning device (S) is capable of releasing the piston rod (25) during the dispensing process, so that the piston (26) moves in the opposite direction to the first direction toward the open dispensing end (14) due to the existing preload force, and in the process, the fluid in the cylinder (13) is dispensed for application through the non-return valve (15), The tensioning device (S) has a ramp (42) which can be rotated by a motor (51) and has a ramp path (41) extending along a helical line. The slope path (41) rises from a first platform (43) along an inclined area (44) to a second platform (45) and descends from the second platform (45) to the first platform (43) via a transition side (47), wherein the slope path has a transition area (46) connecting the second platform (45) and the transition side (47), The tensioning device (S) further comprises a roller (40) in contact with the ramp path (41), the roller being rotatably mounted in a driver (31) connected to the piston rod (25), so that when the ramp (42) rotates in a first rotation direction (52), the ramp path (41) travels under the roller (40) thus rotating. In this case, for the tensioning process, the ramp path (41) rotates in the first rotation direction (52), so that the roller (40) travels on the inclined area (44) until the second platform (45), so that the piston (26) moves to its rear end position, wherein, for the dispensing process, starting from the contact of the roller (40) with the second platform (45), the ramp path (41) rotates in the first rotational direction (52) until the roller (40) passes through the transition region (46) and is accelerated toward the first platform (43) due to the pretensioning, so that the piston (26) moves toward the open dispensing end (14), The device (1) comprises a front part (11) and a rear part (12) behind the front part (11), the front part (11) having the cylinder (13) and the open dispensing end (14), the rear part (12) having the tensioning device (S), the front part (11) and the rear part (12) being two independent parts connected together at a connecting part, an accessory (7) being formed at the front part (11), the accessory (7) being connectable to a hose or a container, wherein the fluid to be applied can be conveyed through the hose, or the fluid to be applied can be held in the container, Wherein, the front part (11) and the rear part (12) are formed of different materials.

2. The device according to claim 1, in, The material of the front part (11) includes titanium, steel or plastic, and the material of the rear part (12) includes aluminum, magnesium, titanium or plastic.

3. The device according to claim 1, wherein The device (1) comprises a housing (2) surrounding the front part (11) and the rear part (12), wherein: A portion of the front portion (11) protrudes from the housing.

4. The device according to claim 2, wherein The device (1) comprises a housing (2) surrounding the front part (11) and the rear part (12), wherein: A portion of the front portion (11) protrudes from the housing.

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