VETERINARY SYRINGE

Description

[0001] The present invention relates to a veterinary syringe with the features of claim 1, with which, for example, medications can be administered in different preselectable quantities.

[0002] Common veterinary syringes often have the difficulty of being complicated to operate when setting the different pre-selectable quantities, of undesirable losses of medication when changing the dosage, and of being poorly ergonomic, for example because a piston rod protrudes backwards over the handle.

[0003] From NZ 521 084 A, a veterinary syringe having the features of the preamble of claim 1 is known. US 2004 / 200861 A1, US 2013 / 26153 A1 and US 6 554 161 B2 each show a veterinary syringe.

[0004] The object of the present invention is therefore to provide an improved veterinary syringe.

[0005] The invention is defined in claim 1. Advantageous further developments are specified in the dependent claims.

[0006] The veterinary syringe may comprise a base body comprising a syringe barrel having a front dispensing end for receiving fluid to be dispensed, a piston rod having a front end portion with a piston which is arranged displaceably in the syringe barrel along a displacement direction, and a rear end portion which is positioned outside the syringe barrel, a handle having a front grip part on the base body and a rear grip part which is pivotally attached to the front grip part, and a metering device for adjusting the volume of fluid to be dispensed.The rear end section of the piston rod can be pivotally attached to the rear handle part (preferably to a section of the rear handle part facing the front handle part) so that by pivoting the rear handle part towards the base body, the piston rod and thus the piston in the syringe barrel is moved towards the front dispensing end in order to dispense fluid present in the syringe barrel. The dosing device can be arranged on the base body and provide an adjustable front stop for the piston rod which defines a minimum distance between the piston (e.g. the piston surface of the piston) and the front dispensing end that can be achieved when moving the front end section of the piston rod in the syringe barrel towards the front dispensing end. This defines the maximum distance towards the front dispensing end that the piston can move.The adjustable front stop of the dosing device can be positioned in at least two predetermined setting positions in which the position of the front stop is different in the direction of displacement, so that by setting one of the setting positions the maximum stroke of the piston rod and thus the maximum dispensable fluid volume can be adjusted.

[0007] Since the rear end section of the piston rod is pivotally attached to the rear handle part, the piston rod does not protrude beyond the rear handle part, so that the rear handle part can be designed ergonomically. Thus, no part of the piston rod (such as the rear end section of the piston rod) protrudes beyond the side of the rear handle part facing away from the main body. In particular, the side of the rear handle part facing away from the main body can be designed as a continuous surface. Since the rear end section of the piston rod can be pivotally attached to the rear handle part (preferably to a section of the rear handle part facing the front handle part), the side of the rear handle part facing away from the main body can be designed as a continuous surface, in particular also in the section opposite the pivotable attachment of the rear end section.Furthermore, the side of the rear handle facing away from the main body can be ergonomically shaped. Of course, the front handle can also be ergonomically designed.

[0008] Preferably, the rear handle part can be pivoted relative to the front handle part about a first pivot axis. The first pivot axis can extend perpendicular to the direction of displacement. The rear end section of the piston rod is in particular fixed to the rear handle part in a connecting region such that only relative pivoting about a second pivot axis is possible, which runs through the connecting region. This connecting region is preferably formed on a section of the rear handle part facing the front handle part. The second pivot axis can extend perpendicular to the direction of displacement and / or parallel to the first pivot axis.

[0009] Because the front stop is adjustable in the direction of travel, only the set amount of fluid or fluid volume is ejected. When the syringe cylinder is subsequently refilled, the syringe cylinder is completely full, and adjusting the front stop does not result in any loss of fluid in the syringe cylinder. The fluid can be a liquid, for example, a medication, a vaccine, or similar.

[0010] The metering device can have a rotary element rotatably mounted on the base body, which comprises a stop element (e.g., a rib) for each of the predetermined injection positions. The stop elements can be spaced apart from one another in the direction of rotation of the rotary element, wherein the desired stop element can be positioned as the front stop by rotating the rotary element.

[0011] This allows the maximum dispensable fluid volume to be safely adjusted in a simple manner (simply by turning the rotary element).

[0012] The stop elements can be arranged on a helical base track surrounding a channel through which the piston rod extends.

[0013] This allows a compact design of the dosing device.

[0014] The rotary element can have a cylindrical locking section with grooves, each groove being assigned to one of the stop elements, and the base body can have an engagement element that engages with one of the grooves at the predetermined setting positions. This allows the desired stop position to be reliably selected and adjusted.

[0015] The grooves of the locking portion may be formed on an outer peripheral surface of the rotary member (e.g., a cylinder portion).

[0016] The piston rod may have a piston rod stop that contacts the front stop when the minimum distance is reached. The piston rod stop may be web-shaped and extend longitudinally and radially along the piston rod.

[0017] The piston rod stop can have a stop surface that is, for example, concavely curved. In this case, it is preferred that the stop surfaces provided by the stop elements be convexly curved, thus ensuring secure contact between the two stop surfaces of the piston rod stop, on the one hand, and the correspondingly selected stop element, on the other. Of course, it is also possible for the stop surfaces of the stop elements to be concave and the stop surface of the piston rod stop to be convex. Furthermore, it is possible for the stop surfaces to be flat.

[0018] In particular, the rear end section of the piston rod is pivotally mounted on the rear handle part in such a way that a relative pivoting movement between the piston rod and the rear handle part is the only possible relative movement between the piston rod and the rear handle part. This prevents, for example, relative movement in and across the longitudinal direction of the piston rod between the piston rod and the rear handle part. Such a pivoting attachment of the rear end section of the piston rod to the rear handle part can also be referred to as a fixed piston rod suspension.

[0019] The piston rod can be guided in the base body (in particular the piston in the syringe barrel) in such a way that the piston rod (or the piston) can only be moved or slid along the direction of displacement. Due to the fixed piston rod suspension, a movement component transverse to the direction of displacement (or transverse to the longitudinal direction of the piston rod) can occur at the rear end section of the piston rod when the rear handle part is pivoted towards the front handle part. This results from the fact that when the rear handle part is pivoted, the connecting area of ​​the pivotable attachment to the rear handle part is moved in a circular arc, with the center of the circular arc lying on the pivot axis of the two handle parts. The piston rod can therefore in particular be provided with such elasticity (or e.g. flexibility) that this movement component transverse to the direction of displacement is compensated.This compensation can thus be achieved in particular by the movement component transverse to the direction of displacement leading to a bending or flexion of the piston rod, which is possible due to the elasticity provided by the piston rod.

[0020] The handle can be designed to include a spring element that pushes the two handle parts apart. This can provide a home position for the veterinary syringe, and when operating the syringe, the user must move the rear handle part toward the front handle part against the spring force.

[0021] In particular, the syringe (in particular the base body or a main section of the base body) can have a rear stop that limits movement of the piston rod opposite to the direction of displacement from the front dispensing end. The position of the rear stop is preferably fixed and cannot be changed, so that the position of the rear stop determines the basic position of the syringe (or the maximum possible pivoting of the rear handle part relative to the front handle part).

[0022] The syringe according to the invention can have a connection for a fluid reservoir that is in fluid communication with the syringe barrel. A check valve can be arranged in the fluid connection to the syringe barrel, which blocks the fluid connection and only opens when the pressure in the fluid connection upstream of the check valve is a predetermined value higher than the pressure in the syringe barrel.

[0023] The port for connecting a fluid reservoir can be located on the rear handle. A fluid connection can be established from the port to the syringe barrel via a supply channel extending through the piston rod.

[0024] In particular, a check valve can be provided in the piston rod (preferably in its front end section), which only opens when the pressure in the feed channel is a predetermined value higher than the pressure in the syringe cylinder.

[0025] Furthermore, the front dispensing end can be in fluid communication with a front end of the syringe via a dispensing channel and a check valve can be arranged in the dispensing channel, which only opens when the pressure in the cylinder exceeds a predetermined value (relative to the external pressure).

[0026] The veterinary syringe is therefore preferably designed as a self-filling syringe because, after the predetermined volume of fluid has been dispensed via the check valve in the dispensing channel, the rear handle is moved away from the dispensing end by the spring preload. This also leads to a corresponding movement of the piston, creating a vacuum in the syringe barrel, which causes the check valve in the piston rod to open. Due to the now free fluid connection from the syringe barrel to the fluid reservoir, fluid can be drawn from the fluid reservoir into the syringe barrel. As soon as the piston rod has moved to the rear stop of the syringe, the check valve in the piston rod closes again, and the syringe barrel is completely filled again.

[0027] However, any design other than the self-filling syringe is also possible. For example, a connection for a fluid reservoir can be provided on the base body or on the syringe barrel itself, sealed by a check valve that only opens when there is negative pressure in the syringe barrel. In this case, no supply channel is required in the piston rod.

[0028] In the veterinary syringe, the plunger can be detachably connected to the front end section, whereby the check valve is accessible for maintenance purposes (e.g., cleaning) after the plunger is detached from the end section. Furthermore, an actuatable safety device can be provided, which prevents accidental release of the plunger by requiring that the plunger be released from the front end section only after the safety device has been actuated.

[0029] The detachable connection can be, for example, a screw connection, a bayonet connection or another connection.

[0030] The locking device can be designed as an anti-rotation device that blocks rotation (e.g. unscrewing) of the piston relative to the piston rod (preferably around the longitudinal axis of the piston rod).

[0031] The safety device may comprise a safety recess as the first safety element and a safety lug as the second safety element, wherein the safety lug protrudes into the safety recess (the safety lug engages with the safety recess) for securing purposes, thereby preventing the piston from detaching from the front end portion. One of the two safety elements may be formed on the piston, and the other of the two safety elements may be formed on the front end portion.

[0032] The securing recess can be designed, for example, as a through-opening in a corresponding wall or in the form of a blind hole (not extending through the entire thickness of the wall).

[0033] The piston can have a piston section with a piston surface and a hollow-cylindrical fastening section, wherein the first securing element is formed on the wall of the hollow-cylindrical fastening section. The first securing element can be formed, for example, at the end of the fastening section facing away from the piston section. Furthermore, the hollow-cylindrical fastening section can have an internal thread, and the front end section can have an external thread that interacts with the internal thread.

[0034] The internal thread can have at least one thread-free region that extends (preferably linearly) in the longitudinal direction of the hollow cylindrical fastening section. The internal thread can thus also be referred to as an interrupted internal thread. Preferably, the at least one thread-free region extends in the end region of the internal thread at the end of the internal thread facing away from the piston section. The thread-free region can also extend over the entire length of the internal thread.

[0035] The internal thread can have two thread-free areas, which are then preferably opposite each other.

[0036] The at least one thread-free region of the internal thread is preferably arranged offset in the circumferential direction relative to the first securing element.

[0037] The hollow cylindrical fastening section is preferably designed so that it is elastic and deformable.

[0038] The external thread can have at least one thread-free region that extends in the longitudinal direction of the piston rod (preferably in a straight line). The external thread can thus also be referred to as an interrupted external thread. Preferably, the at least one thread-free region extends in the end region of the external thread at the end of the external thread facing the piston section. The thread-free region can also extend over the entire length of the external thread.

[0039] The external thread can have two thread-free areas, which are then preferably opposite each other.

[0040] In particular, the at least one thread-free region of the external thread can be arranged offset in the circumferential direction relative to the second securing element.

[0041] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations indicated, but also in other combinations or on their own, without departing from the scope of the present invention.

[0042] The invention is explained in more detail below using exemplary embodiments with reference to the attached drawings, which also disclose features essential to the invention. These exemplary embodiments are merely illustrative and are not to be interpreted as restrictive. For example, a description of an embodiment with a large number of elements or components should not be interpreted as meaning that all of these elements or components are necessary for implementation. Rather, other embodiments may also contain alternative elements and components, fewer elements or components, or additional elements or components. Elements or components of different embodiments may be combined with one another unless otherwise stated. Modifications and variations described for one of the exemplary embodiments may also be applicable to other embodiments.To avoid repetition, identical or corresponding elements in different figures are designated by the same reference numerals and are not explained more than once. The figures show: . Fig. 1 is a sectional view of an embodiment of the veterinary syringe 1 according to the invention; Fig. 2 is an isometric view of the piston rod 8 including the piston K; Fig. 3 is a front view of the piston rod 8 and the piston K; Fig. 4 is a sectional view of the piston rod 8 including the piston K along the section line AA in Fig. 3 ; Fig. 5 an enlarged view of detail C of Fig. 4 ; Fig. 6 a sectional view of the piston rod 8 including piston K along the section line BB in Fig. 4 ; Fig. 7 an isometric view of the piston rod 8; Fig. 8 a front view of the piston rod 8 of Fig. 7 ; Fig. 9 a sectional view of the piston rod 8 along the section line AA in Fig. 8; Fig. 10 an isometric view of the piston K; Fig. 11 a front view of the piston K; Fig. 12 a sectional view of the piston K along the section line AA in Fig. 11 ; Fig. 13 a top view of the connecting piece 23; Fig. 14 an isometric view of the connecting piece 23; Fig. 15 a front view of the connecting piece 23; Fig. 16 a sectional view of the connecting piece 23 along the section line AA in Fig. 15 ; Fig. 17 a front view of the rear handle part 15; Fig. 18 a sectional view of the rear handle part 15 along the section line AA in Fig. 17 ; Fig. 19 an isometric view of the rear handle part 15; Fig. 20 an isometric view of the rotating element 51; Fig. 21 a top view of the rotating element 51, and Fig. 22 a sectional view of the rotating element 51 of Figs. 20 and 21 .

[0043] At the Fig. 1In the embodiment shown, the veterinary syringe 1 according to the invention comprises a base body 2 with a syringe barrel 3 for receiving fluid to be dispensed (e.g., a medicament or vaccine in liquid form). The syringe barrel 3 is releasably connected to a main section 21 of the base body 2 by means of a screw connection and comprises a front dispensing end 4, which opens into a dispensing channel 5 in which a first check valve 6 is located. A cannula (not shown), for example, can be attached to the front end 7 of the dispensing channel 5.

[0044] The syringe 1 further comprises a piston rod 8, which is arranged displaceably with its front end section 9 in the syringe barrel 3 along a displacement direction 10. A piston K is arranged at the front end section 9, which, when displaced towards the front discharge end 4, causes fluid to be discharged from the syringe barrel 3 via the front discharge end 4 and the discharge channel 5, since the first check valve 6 opens due to the pressure built up in the syringe barrel 3 by the piston movement.

[0045] The piston rod 8 extends beyond a rear end 11 of the syringe cylinder 3 out of the base body 2 and, as will be described in detail below, is connected by its rear end section 12 in an articulated manner to a rear grip part 15 of a handle 13 of the syringe 1.

[0046] The handle 13 has a front handle part 14 and the rear handle part 15 formed on the base body 2 (here in the main section 2 1 ). The front handle part 14 has an upper section 16 projecting upwards from the base body 2 and a lower section 17 projecting downwards from the base body 2. At the free end 18 of the lower section 17 of the front handle part 14, the rear handle part 15 is pivotable about a first pivot axis (which is here perpendicular to the plane of the drawing of Fig. 1 runs) is pivotably mounted, whereby a spring F provided between the two handle parts 14 and 15 presses the two handle parts 14 and 15 apart. As shown in the sectional view of Fig. 1 As can be clearly seen, the handle 13 essentially has a V-shape.

[0047] In the Fig. 1In the basic position of the syringe 1 shown, the front end section 9 of the piston rod 8 rests against a rear stop 19 formed in the main section 21 and therefore cannot be moved further away from the front dispensing end 4 against the displacement direction 10. Due to the spring F, this basic position exists when no external force is exerted on the rear handle part 15.

[0048] As in particular the Fig. 1 , 4 , 5, 6 and 9 can be removed, the piston rod 8 comprises a piston rod main section 8 1 with a feed channel 20 which runs through in the longitudinal direction of the piston rod 8 and which is in fluid connection with the interior of the syringe cylinder 3 via a connecting channel 21 in the front end section 9 and a through opening 70 in the piston K, a second check valve 22 being arranged in the connecting channel 21.

[0049] In order to be able to install the second check valve 22 in the front end section 9 and to be able to clean it for maintenance purposes, for example, the piston K is detachably attached to the front end section 9 via a screw connection.

[0050] In detail, the piston K comprises, in particular Fig. 5 can be seen, a piston section 71 with a piston surface 72 and an annular piston groove 73 in which a piston sealing ring 74 is seated. Adjoining the piston section 71 is a hollow cylindrical fastening section 75 which has an internal thread 76 which is not continuous in the circumferential direction, but has two opposite thread-free areas 77 ( Figs. 10 and 12 ).

[0051] A securing recess 79 (or first securing element) is formed in the wall of the hollow-cylindrical fastening section 75 at the end 78 facing away from the piston section 71. Furthermore, a marking 80 is provided on the wall of the hollow-cylindrical fastening section 75, indicating how the second check valve 22 is to be inserted into the connecting channel 21.

[0052] Since the through-opening 70 extends through the entire piston section 71 to the interior of the hollow cylindrical fastening section 75, the desired fluid connection to the feed channel 20 to the interior of the injection cylinder 3 can be provided when the piston K is screwed onto the front end section 9.

[0053] For screwing on, an external thread 81 is formed on the outside of the front end section 9, which is interrupted in the circumferential direction by two thread-free areas 82, which are preferably opposite each other ( Fig. 7-9). At the front end of the front end section 9, an annular groove 83 is formed in which a sealing ring 84 is seated ( Fig. 5 ).

[0054] Furthermore, the front end section 9 comprises a radially projecting securing nose 85 (or second securing element), which is spaced from the external thread 81 in the direction of the rear end section 12 of the piston rod 8 ( Figs. 7 and 8 ).

[0055] The dimensions of the unthreaded areas 82 in the circumferential direction of the external thread 81, in conjunction with the dimensions of the unthreaded areas 77 of the internal thread 76 of the piston K, are selected such that the piston K can be screwed onto the front end section 9 and a permanent threaded connection is possible. To this end, the hollow cylindrical fastening section 75 simply needs to be compressed in the areas of the unthreaded areas 77 before the end 78 of the hollow cylindrical fastening section 75 would strike the locking lug 85 during screwing.Due to the resulting deformation of the fastening section 75, the end 78 of the hollow cylindrical fastening section 75 can be moved over the securing lug 85 during screwing on, and the securing recess 79 can be positioned such that, after the described compression is completed, the hollow cylindrical fastening section 75 relaxes into its basic shape due to its elasticity (the deformation of the hollow cylindrical fastening section 75 is thus reversed). Since the piston K is positioned such that the securing recess 79 lies opposite the securing lug 85, the securing lug 85 then projects into the securing recess 79, as shown in FIG. Fig. 2 to 6 is shown. Thus, the locking lug 85 engages in the locking recess 79, thereby providing protection against rotation or securing against rotation.

[0056] Even if a rotational force is exerted on the piston K, an undesired unscrewing of the piston K from the front end section 9 can be reliably prevented because the locking lug 85 protrudes into the locking recess 79 and thus unscrewing of the piston K from the front end section 9 is reliably prevented. An undesired rotational force on the piston K can occur, for example, when unscrewing the cylinder 3 from the main section 2 1 of the base body 2 for cleaning purposes if, for example, due to contamination, the friction between cylinder 3 and piston K is higher than the friction between piston K and the front end section 9.

[0057] If, after use of the syringe 1 according to the invention, the second check valve 22 needs to be cleaned or serviced, the cylinder 3 can first be unscrewed from the main section 21 of the base body 2. Due to the anti-twist protection provided by the securing lug 85 and the securing recess 79, the piston K remains on the front end section 9. In order to now release the piston K from the front end section 9, the hollow cylindrical fastening section 75 must be deformed by pressing together in the area of ​​the two opposite thread-free areas 77, so that the cross-sectional shape of the hollow cylindrical fastening section 75 in the area of ​​the securing recess 79 is no longer circular but oval. As a result, the securing recess 79 is moved away from the front end section 9 along the radial direction of extent of the guide lug 85, so that there is no longer any engagement of the securing lug 85 with the securing recess 79.In this state, you can begin unscrewing the piston K. The dimensions of the locking lug 85 and the locking recess 79 in the longitudinal direction of the piston rod 8 are selected in the described embodiment such that after a complete rotation (360°) of the piston K, the end 78 of the wall of the hollow cylindrical fastening section 75 just no longer touches the locking lug 85. Thus, the piston K can be further unscrewed since there is no longer any anti-rotation protection.

[0058] After unscrewing the piston K, the second check valve 22 with its valve body 22 1 , its valve spring 22 2 and its seal 22 3 is freely accessible and can be cleaned and maintained.

[0059] The piston K can then be screwed on again in the manner already described, so that the desired anti-rotation lock is provided by the engagement of the locking lug 85 in the locking recess 79.

[0060] The rear end section 12 of the piston rod 8 is connected to a connecting piece 23 ( Fig. 1 and Fig. 13-16 ) which has a hose attachment 24.

[0061] At the upper free end 25 ( Fig. 1 , 17 to 19 ) of the rear handle part 15 is a bottle attachment 26 with a piercing spike 27 ( Fig. 1 ) is mounted, which can, for example, pierce through a membrane of a medication bottle (not shown) attached to the bottle cap 26 when the medication bottle is attached to the bottle cap 26. The bottle cap 26 further comprises a hose attachment 28 which is in fluid connection with the piercing spike 27. Two ends of a hose 29 are pushed onto the two hose attachments 28 and 24, so that a fluid connection exists via the connecting piece 23 from the piercing spike 27 (and thus to the contents of the corresponding medication bottle) to the feed channel 20 of the piston rod 8.

[0062] The bottle cap 26 also has a ventilation channel 30 running in the piercing spike 27, which is connected to the environment via a third check valve 31, in order to avoid the formation of an excessive negative pressure in the medication bottle when the liquid is withdrawn.

[0063] The syringe 1 is designed as a so-called self-filling syringe, which automatically fills the syringe cylinder 3 with the amount of ejected fluid after a successful ejection process.

[0064] A user of the syringe 1 can hold the handle 13 in their hand such that their index finger rests on the upper section 16, their middle finger, ring finger and little finger on the lower section 17 of the front handle part 14 and the ball of the hand with thumb rests on the rear handle part 15. If the user now squeezes their hand, they move the rear handle part 15 against the force of the spring F towards the base body 2, whereby the piston rod 8 with its front end section 9 and thus with the piston K in the syringe cylinder 3 is moved along the displacement direction 10 towards the front dispensing end 4. This builds up excess pressure in the syringe cylinder 3, which causes the first check valve 6 to open and thus fluid to be dispensed via the dispensing channel 5.When the user opens their hand again, the rear handle part 15 is moved away from the base body 2 due to the spring force of the spring F, whereby the piston rod 8 together with the front end section 9 and piston K are moved against the direction of displacement 10 in the syringe cylinder 3. This closes the first check valve 6 and a negative pressure builds up inside the syringe cylinder 3, which causes the second check valve 22 in the front end section 9 to open and thereby sucks fluid from the medication bottle into the interior of the syringe cylinder 3. The backward movement of the rear handle part 15 ends when the front end section 9 rests against the rear stop 19. The second check valve 22 closes again and the interior of the syringe cylinder 3 is once again completely filled with fluid to be dispensed.

[0065] As in Fig. 13 to 16As shown, a channel 35 formed in the connecting piece 23 is substantially V-shaped, wherein the connecting piece 23 has a base element 36 with a connection 37 for the rear end section 12 of the piston rod 8 and the hose attachment 24 extending obliquely thereto. On the base element 36, two laterally extending pivot pins 38, 39 are formed, which are inserted into corresponding receptacles 40 ( Figs. 17 - 19 ) of the rear handle part 15 are inserted so that the connecting piece 23 is rotatably mounted.

[0066] Due to this design of the syringe 1, the rear end section 12 of the piston rod 8 is rotatably mounted on the rear handle part 15 in such a way that a longitudinal or transverse relative movement between the piston rod 8 and the rear handle part 15 is not possible. One can also say that the rear end section 12 of the piston rod 8 is fixed to the rear handle part 15 in a connecting area in such a way that only a relative pivoting about a second pivot axis is possible, which runs through the connecting area. Fig. 17 -19 combined with Fig. 1 As can be seen, this connecting area is formed on a section 42 of the rear handle part 15 facing the front handle part 14.

[0067] Preferably, the second pivot axis extends perpendicular to the displacement direction and / or parallel to the first pivot axis, about which the rear handle part 15 can be pivoted relative to the front handle part 14. This design of the attachment of the rear end section 12 of the piston rod 8 to the rear handle part 15 allows the rear side 41 of the rear handle part 15, which faces away from the base body 2, to be ergonomically designed for better handling of the syringe 1. Thus, the rear side 41, and thus also in particular the section of the rear side 41 opposite the connecting region, can be continuous (without gaps or holes) and have a correspondingly ergonomic shape for the hand of a user.

[0068] Since the rear end section 12 of the piston rod 8 is fixed to the rear handle part 15 in the connection area in such a way that only a relative pivoting about the second pivot axis is possible, the piston rod 8 is provided with a predetermined elasticity that allows bending of the piston rod 8. Thus, when pivoting the rear handle part 15 towards the front handle part 14, a movement component transverse to the displacement direction (or transverse to the longitudinal direction of the piston rod) can occur (in Fig. 1e.g., from bottom to top). This results from the fact that when the rear handle part 15 is pivoted, the connecting area of ​​the pivotable attachment on the rear handle part 15 is moved in a circular arc, with the center of the circular arc lying on the pivot axis of the two handle parts 14, 15. Due to the predetermined elasticity of the piston rod 8, the movement component transverse to the direction of displacement leads to a bending of the piston rod 8, so that the movement component transverse to the direction of displacement is compensated. The elasticity is designed such that only such a deflection of the piston rod 8 occurs that does not influence the movement of the piston rod 8 with its front end section 9 and thus with the piston K in the syringe cylinder 3 along the direction of displacement 10 to the front dispensing end 4, so that the displacement of the piston K in the syringe cylinder 3 takes place without problems.

[0069] The syringe 1 further comprises a dosing device 50 arranged on the base body 2, with which the maximum dispensable fluid volume can be adjusted. For this purpose, the dosing device 50 comprises a rotary element 51 arranged at the rear end of the base body 2 with an end cap 61 ( Fig. 1 ). The rotary element 51 comprises a cylindrical grip section 52, an adjoining cylindrical locking section 53 and an adjoining cylindrical inner section 54 with locking lugs 55, as shown in particular in Figures 20 to 22 is clearly visible, whereby in the Figures 20 to 22the end cap 61 is not shown. A cylindrical channel 56 is formed inside the rotary element 51, through which the piston rod 8 runs and is guided. Stop elements 58 (e.g., ribs 58) are formed around the channel 56 on a helical base track 57, spaced apart from one another in the circumferential direction, which stop elements 58 preferably have the same height here, so that their stop surfaces 59 facing away from the base track 57 have different distances in the displacement direction 10 from the front discharge end 4.

[0070] On the outside of the cylindrical locking section 53, a groove 60 extending in the longitudinal direction is provided for each stop element 58.

[0071] In the inserted state, which is Fig. 1 As shown, the rotary element 51 is rotatably mounted on the base body 2, with the piston rod 8 extending through the channel 56.

[0072] The main section 21 of the base body 2 has, in the region of the cylindrical grid section 53, a protruding engagement element 62 which engages with one of the longitudinal grooves 60 depending on the rotational position of the rotary element 51.

[0073] The piston rod 8 has, as for example in Fig. 1 , 2 , 4 , 7 and 8 As can be seen, a piston rod stop 65 extending radially from the main piston rod section 8 1 and having a stop surface 66. The piston rod 8 can now be moved in the direction of the front dispensing end 4 by moving the rear handle part 15 until the stop surface 66 of the piston rod stop 65 comes into contact with the stop surface 59 of the corresponding stop element 58 on the helical base track 57. This determines the maximum stroke of the piston rod 8 for an ejection process, which also defines the maximum ejection volume of the fluid inside the syringe cylinder 3.

[0074] When syringe 1 is in the Fig. 1 shown basic position, the desired maximum ejection volume can be set by rotating the rotary element 51 by actuating the handle portion 52. This is defined by the stop element 58 on the helical base track 57, which is opposite the piston rod stop 65.

[0075] This allows the maximum ejection volume to be set in a simple manner, thus ensuring that a user can always dispense the specified volume of fluid in the syringe cylinder via the front dispensing end 4.

[0076] In the embodiment described here, for example, the stop surfaces 59 of immediately adjacent stop elements can be spaced 1.3 mm apart in the displacement direction 10, whereby the ejection volume can be adjusted in 0.5 ml steps from 0.5 ml to 10 ml.

Claims

1. Veterinary syringe, having a main body (2), which comprises a syringe cylinder (3), having a front dispensing end (4) and a rear end (11), for receiving fluid to be dispensed, a plunger rod (8), which has a front end portion (9) with a plunger (K), which is arranged displaceably along a displacement direction (10) in the syringe cylinder (3), and a rear end portion (12), which is positioned outside the syringe cylinder (3), a handle (13), which has a front gripping part (14) on the main body (2) and a rear gripping part (15), which is fastened pivotably to the front gripping part (14), and a metering device (50) for setting the fluid volume to be dispensed, wherein the rear end portion (12) of the plunger rod (8) is fastened pivotably to the rear gripping part (15) such that, by pivoting of the rear gripping part (15) in the direction of the main body (2), the plunger rod (8), and therefore the plunger (K), is moved in the syringe cylinder (3) to the front dispensing end (4) in order to dispense fluid present in the syringe cylinder (3), wherein the metering device (50) is arranged on the main body (2) and provides an adjustable front stop (58) for the plunger rod (8), said stop defining a minimum distance between the plunger (K) and the front dispensing end (4), that can be reached when the plunger (K) is moved in the syringe cylinder (3) to the front dispensing end (4), wherein the adjustable front stop of the metering device (50) can be brought into at least two predetermined setting positions, in which the position of the front stop (58) in the displacement direction (10) differs, and therefore, by means of the setting of one of the setting positions, the maximum stroke of the plunger rod (8), and therefore the maximum fluid volume which can be dispensed, can be set, characterized in that the rear end portion (12) of the plunger rod (8) is fastened pivotably to the rear gripping part (15) such that a relative pivoting movement between the plunger rod (8) and the rear gripping part (15) is the only possible relative movement between the plunger rod (8) and the rear gripping part (15), wherein the plunger rod (8) is guided in such a manner that the plunger (K) is displaceable in the syringe cylinder (3) only along the displacement direction (10), and wherein the plunger rod (8) is provided with such elasticity that a movement component transversely with respect to the displacement direction (10) occurring at the rear end portion (12) of the plunger rod (8) when the rear gripping part (15) is pivoted towards the front gripping part (14) is compensated for by bending of the plunger rod (8).

2. Veterinary syringe according to Claim 1, wherein the rear end portion (12) of the plunger rod (8) is fastened pivotably to a portion (42) of the rear gripping part (15) that faces the front gripping part (14).

3. Veterinary syringe according to Claim 1 or 2, wherein the side (41) of the rear gripping part (15) that faces away from the main body (2) is configured as a continuous surface.

4. Veterinary syringe according to one of the above claims, wherein the side (41) of the rear gripping part (15) that faces away from the main body (2) is configured as a continuous surface in a portion which lies opposite the rear end portion (12) of the plunger rod (8).

5. Veterinary syringe according to one of the above claims, wherein the metering device (50) has a rotary element (51) which is mounted rotatably on the main body and comprises a stop element (58) for each of the predetermined setting positions, wherein the stop elements (58) are arranged spaced apart from one another in the direction of rotation of the rotary element (51), and wherein, by rotation of the rotary element (51), the desired stop element (58) can be positioned as the front stop.

6. Veterinary syringe according to Claim 5, wherein the stop elements (58) are arranged on a helical main path (57) which surrounds a channel (56) through which the plunger rod (8) extends.

7. Veterinary syringe according to Claim 5 or 6, wherein the rotary element (51) has a cylindrical latching portion (53) with grooves (60), wherein each groove (60) is assigned to one of the stop elements (58), and the main body (2) has an engagement element (62) which, in the predetermined setting positions, is in engagement with one of the grooves (60).

8. Veterinary syringe according to one of the above claims, wherein the plunger rod (8) has a plunger rod stop (65) which, when the minimum distance is reached, is in contact with the front stop (58).

9. Veterinary syringe according to one of the above claims, wherein a connection (26) for connecting a fluid reservoir to the rear gripping part (15) is provided on the rear gripping part (15), wherein there is a first fluid connection from the connection (26) through a feed channel (20) in the plunge rod (8) as far as the syringe cylinder (3).

10. Veterinary syringe according to Claim 9, wherein the front end portion (9) of the plunger rod (8) has a nonreturn valve (22) which blocks the first fluid connection and opens only when the pressure in the feed channel (20) lies above the pressure in the syringe cylinder (3) by a predetermined value.

11. Veterinary syringe according to one of the above claims, wherein the front dispensing end (4) is in a second fluid connection with a front end (7) of the syringe (1) via a dispensing channel (5) and a nonreturn valve (6) is arranged in the dispensing channel (5), said nonreturn valve blocking the second fluid connection and opening only when the pressure in the syringe cylinder (3) exceeds a predetermined value.

12. Veterinary syringe according to one of the above claims, wherein the syringe is configured as a self-filling syringe.