Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61D—VETERINARY INSTRUMENTS, IMPLEMENTS, TOOLS, OR METHODS
  • A61D7/00—Devices or methods for introducing solid, liquid, or gaseous remedies or other materials into or onto the bodies of animals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/24—Check- or non-return valves
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M5/204—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically connected to external reservoirs for multiple refilling
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
  • A61M5/31511—Piston or piston-rod constructions, e.g. connection of piston with piston-rod
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
  • A61M2005/2073—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically preventing premature release, e.g. by making use of a safety lock
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/178—Syringes
  • A61M5/31—Details
  • A61M2005/3128—Incorporating one-way valves, e.g. pressure-relief or non-return valves

Definitions

• the present invention relates to a veterinary syringe for administering, for example, medicines.
• the object of the present invention is therefore to provide an improved veterinary syringe.
• the veterinary syringe can have a main body, which includes a syringe barrel having a front dispensing end for receiving fluid to be dispensed, a plunger rod having a front end portion with a plunger that is slidably disposed in the syringe barrel along a displacement direction, and a connector for connecting to a fluid reservoir have, wherein there is a fluid connection from the connection through a supply channel in the piston rod to the syringe barrel.
• the piston rod can have a non-return valve (preferably in its front end section), which blocks the fluid connection and only opens when the pressure in the feed channel is a predetermined value above the pressure in the syringe cylinder.
• the piston can be detachably connected to the front end section and after detaching the piston from the end section the non-return valve can be accessed for maintenance purposes. Furthermore, an actuatable safety device can be formed, which prevents unintentional release of the piston in that the piston can only be released from the front end section after the safety device has been actuated
• the detachable connection can be, for example, a screw connection, a bayonet connection or some other connection.
• the safety device can be designed as an anti-twist device that blocks the piston from rotating (e.g. unscrewing) relative to the piston rod (preferably around the longitudinal axis of the piston rod).
• the fuse may have a securing recess as the first securing element and a securing lug as the second securing element, with the securing lug protruding into the securing recess for securing (the securing lug engages with the securing recess) and thereby preventing the piston from becoming detached from the front end section.
• One of the two securing elements can be formed on the piston and the other of the two securing elements can be formed on the front end section.
• 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).
• the piston can have a piston section with a piston surface and a hollow-cylindrical fastening section, the first securing element being formed on the wall of the hollow-cylindrical fastening section.
• the first securing element can be formed, for example, on the end of the fastening section pointing away from the piston section.
• the hollow-cylindrical fastening section can have an internal thread and the front end section can have an external thread cooperating with the internal thread.
• the internal thread can have at least one thread-free area which extends (preferably in a straight line) in the longitudinal direction of the hollow-cylindrical fastening section.
• the internal thread can thus also be referred to as an interrupted internal thread.
• the at least one thread-free area preferably extends in the end area of the internal thread at the end of the internal thread pointing away from the piston section.
• the thread-free area can also extend over the entire length of the internal thread.
• the internal thread can have two of the thread-free areas, which are then preferably opposite one another.
• the at least one thread-free area of the internal thread is preferably arranged offset in the circumferential direction relative to the first securing element.
• the hollow-cylindrical fastening section is preferably designed in such a way that it is elastic and deformable.
• the external thread can have at least one thread-free area 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.
• the at least one thread-free area preferably extends in the end area of the external thread at the end of the external thread pointing towards the piston section.
• the thread-free area can also extend over the entire length of the external thread.
• the external thread can have two of the thread-free areas, which are then preferably opposite one another.
• the at least one thread-free area of the external thread can be arranged offset in the circumferential direction relative to the second securing element.
• the plunger rod may have a rear end portion positioned outside of the syringe barrel.
• the syringe can have a handle which has a front handle part on the base body and a rear handle part which is pivotably attached to the front handle part, and a dosing device for adjusting the volume of fluid to be dispensed.
• the rear end section of the plunger rod can be attached pivotably to the rear handle part (preferably to a section of the rear handle part pointing towards the front handle part), so that pivoting the rear handle part in the direction of the main body moves the plunger rod and thus the plunger in the syringe barrel to the front dispensing end is used to dispense fluid present in the syringe barrel.
• the metering device may be located on the body and provide an adjustable front stop for the plunger rod that defines a minimum distance between the plunger (e.g., the plunger face of the plunger) and the front dispensing end, which when moving the front end portion of the plunger rod in the syringe barrel to the front dispensing end can be achieved. This defines the maximum extent to which the piston can be moved in the direction of the front delivery end.
• 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, see above that by setting one of the setting positions, the maximum stroke of the piston rod and thus the maximum fluid volume that can be delivered can be set.
• the rear end portion of the plunger rod may be pivotally attached to the rear handle portion such that pivoting the rear handle portion toward the body moves the plunger rod and thus the plunger in the syringe barrel toward the front dispensing end to dispense fluid present in the syringe barrel.
• the metering device may be located on the body and provide an adjustable front stop for the plunger rod that defines a minimum distance between the plunger (e.g., the plunger surface of the plunger) and the front dispensing end that is required when moving the front end portion of the plunger rod in the syringe barrel to the front dispensing end can be achieved. This defines the maximum extent to which the piston can be moved in the direction of the front discharge end.
• 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 the maximum stroke of the piston rod and thus the maximum fluid volume that can be dispensed can be set by setting one of the setting positions.
• the piston rod Since the rear end portion of the piston rod is pivotally attached to the rear grip, the piston rod does not protrude beyond the rear grip, so that the rear grip can be ergonomically designed. Thus, no part of the piston rod (such as the rear end portion of the piston rod) protrudes beyond the side of the rear handle part facing away from the main body.
• the side of the rear handle part pointing away from the base body can be designed as a continuous surface.
• the rear end section of the piston rod can be attached pivotably to the rear handle part (preferably to a section of the rear handle part pointing towards the front handle part), the side of the rear handle part pointing away from the main body can also be attached in particular in the section opposite the pivotable attachment of the rear end section , be designed as a continuous surface.
• the side of the rear handle part pointing away from the base body can be ergonomically shaped.
• the front handle part can also be designed ergonomically.
• the rear handle part can preferably be pivoted about a first pivot axis relative to the front handle part.
• the first pivot axis can extend perpendicular to the direction of displacement.
• the rear end section of the piston rod is fixed in particular on the rear handle part in a connection area in such a way that only relative pivoting about a second pivot axis that runs through the connection area is possible.
• This connection area is preferably on a section of the rear handle part pointing towards the front handle part educated.
• the second pivot axis can extend perpendicular to the displacement direction and/or parallel to the first pivot axis.
• the fluid can in particular be a liquid.
• the fluid can be a drug, a vaccine or the like.
• the dosing device can have a rotating element which is rotatably mounted on the base body and comprises a stop element (e.g. a rib) for each of the predefined injection positions.
• the stop elements can be arranged at a distance from one another in the direction of rotation of the rotary element, it being possible to position the desired stop element as the front stop by rotating the rotary element.
• the maximum volume of fluid that can be delivered can be reliably set in a simple manner (simply by turning the rotary element).
• the stop members may be arranged on a helical base surrounding a channel through which the piston rod extends.
• the rotary element can have a cylindrical locking section with grooves, each groove being associated with one of the stop elements and the base body having an engagement element which is in engagement with one of the grooves in the predetermined adjustment positions. In this way, the desired stop position can be safely selected and set.
• the grooves of the locking portion may be formed on an outer peripheral surface of the rotating member (e.g., a cylinder portion).
• the piston rod may have a piston rod stop which is in contact with the front stop when the minimum distance is reached.
• the piston rod stop can be web-shaped and can extend in the longitudinal direction of the piston rod and radially.
• the piston rod stop can have a stop surface that is concavely curved, for example.
• the stop surfaces provided by the stop elements are convexly curved, thereby 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.
• the stop surfaces of the stop elements it is also possible for the stop surfaces of the stop elements to be concave and for the stop surface of the piston rod stop to be convex. It is also possible for the stop surfaces to be planar.
• the rear end portion of the piston rod is pivotally attached to the rear handle portion such that relative pivotal movement between the piston rod and the rear handle portion is the only possible relative movement between the piston rod and the rear handle portion.
• Such a pivotable 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.
• the piston rod can be guided in the base body (in particular the piston in the syringe cylinder) in such a way that the piston rod (or the piston) can only be displaced or moved along the displacement direction. Due to the fixed piston rod suspension, a movement component transverse to the displacement direction (or transverse to the longitudinal direction of the piston rod) can therefore occur at the rear end section of the piston rod when the rear handle part is pivoted toward the front handle part. This results from the fact that when the rear handle part is pivoted, the connection area of the pivotable attachment on the rear handle part is moved on an arc of a circle, with the center point of the arc of a circle lying on the pivot axis of the two handle parts.
• the piston rod can therefore be provided in particular with such elasticity (or e.g.
• this component of movement is compensated transversely to the direction of displacement.
• This compensation can thus be achieved in particular in that the movement component transversely to the direction of displacement leads to a bending or deflection of the piston rod, which is possible due to the provided elasticity of the piston rod.
• the handle can be designed in such a way that a spring element is provided, which pushes the two handle parts apart.
• a basic position of the veterinary syringe can thus be provided and when operating the syringe, a user must move the rear handle part against the spring force in the direction of the front handle part.
• the syringe in particular the base body or a main section of the base body
• the position of the rear stop is preferably stationary and cannot be changed, so that the position of the rear stop defines the basic position of the syringe (or the maximum possible pivoting of the rear handle part relative to the front handle part).
• the syringe according to the invention can have a connection for a fluid reservoir which is in fluid connection with the syringe barrel.
• a check valve can be arranged in the fluid connection to the syringe cylinder, which blocks the fluid connection and only opens when the pressure in the fluid connection in front of the check valve is a predetermined value above the pressure in the syringe cylinder.
• connection for connecting a fluid reservoir can be formed on the rear handle part. There can be a fluid connection from the connection to the syringe barrel through a feed channel extending through the plunger rod.
• 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).
• the veterinary syringe is preferably designed as a self-filling syringe, since after the predetermined volume of fluid has been dispensed via the check valve in the dispensing channel, the rear grip part is moved away from the dispensing end again by the spring preload of the spring. This also leads to a corresponding movement of the piston, whereby a vacuum is generated in the syringe cylinder, which leads to the non-return valve in the piston rod opening, so that due to the now free fluid connection from the syringe cylinder to the fluid reservoir, fluid is sucked from the fluid reservoir into the syringe cylinder can. As soon as the plunger rod has moved to the rear stop of the syringe, the non-return valve in the plunger rod closes again and the syringe cylinder is completely filled again.
• a connection for a fluid reservoir can also be provided on the base body or on the syringe barrel itself, which is closed via a non-return valve that only opens when the pressure in the syringe barrel is negative. In this case, no feed channel has to be formed in the piston rod.
• FIG. 1 shows a sectional view of an embodiment of the veterinary syringe 1 according to the invention
• FIG. 3 shows a front view of piston rod 8 and piston K
• Fig. 4 shows a sectional view of the piston rod 8 together with the piston K along the section line A-A in
• Fig. 5 is an enlarged view of detail C of Fig. 4;
• Fig. 6 shows a sectional view of the piston rod 8 together with the piston K along the section line B-B in Fig. 4;
• Fig. 7 is an isometric view of the piston rod 8;
• Fig. 8 is a front view of the piston rod 8 of Fig. 7;
• Fig. 9 is a sectional view of the piston rod 8 along line A-A in Fig. 8;
• Fig. 11 is a front view of the piston K
• Fig. 12 is a sectional view of the piston K taken along line A-A in Fig. 11;
• Fig. 13 is a plan view of connector 23
• Figure 14 is an isometric view of connector 23
• Fig. 15 is a front view of the connector 23
• Fig. 16 is a sectional view of the connector 23 taken along line A-A in Fig. 15;
• Fig. 17 is a front view of the rear handle portion 15;
• Fig. 18 is a sectional view of the rear handle portion 15 taken along line A-A of Fig. 17;
• Fig. 19 is an isometric view of rear handle portion 15;
• Figure 20 is an isometric view of rotary member 51
• Fig. 21 is a plan view of the rotary member 51.
• FIG. 22 is a sectional view of the rotating member 51 of FIGS. 20 and 21.
• FIG. 22 is a sectional view of the rotating member 51 of FIGS. 20 and 21.
• the veterinary syringe 1 comprises a base body 2 with a syringe barrel 3 for receiving fluid to be dispensed (eg a medicament or vaccine in liquid form).
• the syringe cylinder 3 is here detachably connected to a main section 2i 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 non-return valve 6 is seated.
• a cannula can be attached at the front end 7 of the delivery channel 5, for example.
• the syringe 1 also comprises a piston rod 8 which is arranged with its front end section 9 in the syringe cylinder 3 so that it can be displaced along a displacement direction 10 .
• a piston K is arranged on the front end section 9, which, when displaced in the direction of the front discharge end 4, causes fluid to be discharged from the syringe cylinder 3 via the front discharge end 4 and the discharge channel 5, since the pressure built up in the syringe cylinder 3 by the piston movement the first check valve 6 opens.
• the piston rod 8 extends out of the base body 2 via a rear end 11 of the syringe cylinder 3 and, as will be described in detail below, is connected with its rear end section 12 in an articulated manner to a rear grip part 15 of a handle 13 of the syringe 1 .
• the handle 13 has a front handle part 14 formed on the base body 2 (here in the main section 2i) and the rear handle part 15.
• 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 .
• the rear handle part 15 is mounted so that it can pivot about a first pivot axis (which here runs perpendicular to the plane of the drawing in Fig. 1), with a spring F provided between the two handle parts 14 and 15 separating the two Handle parts 14 and 15 pushed apart.
• the handle 13 essentially has a V-shape.
• the piston rod comprises
• the piston K is detachably fastened to the front end section 9 via a screw connection.
• the piston K as can be seen in particular from FIG. 5, comprises a piston section 71 with a piston surface 72 and an annular piston groove 73 in which a piston sealing ring 74 is seated.
• a hollow-cylindrical section connects to the piston section 71
• 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).
• a securing recess 79 (or first securing element) is formed in the wall of the hollow-cylindrical fastening section 75 at the end 78 pointing away from the piston section 71 . Furthermore, a marking 80 is provided on the wall of the hollow-cylindrical fastening section 75 which indicates how the second check valve 22 is to be inserted into the connecting channel 21 .
• 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 supply 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.
• 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 one another (FIGS. 7-9).
• an annular groove 83 is formed, in which a sealing ring 84 is seated (Fig. 5).
• the front end section 9 comprises a radially projecting securing lug 85 (or second securing element), which is spaced apart from the external thread 81 in the direction of the rear end section 12 of the piston rod 8 (FIGS. 7 and 8).
• the dimension of the thread-free areas 82 in the circumferential direction of the external thread 81 is selected in connection with the dimension of the thread-free areas 77 of the internal thread 76 of the piston K so that the piston K can be screwed onto the front end section 9 and a permanent threaded connection is possible.
• the hollow-cylindrical fastening section 75 must be compressed in the areas of the unthreaded areas 77 .
• the end 78 of the hollow-cylindrical fastening section 75 can be moved over the securing lug 85 when screwing on and the securing recess 79 can be positioned in such a way that after the end of the compression described, 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 so that the securing recess 79 is opposite the securing lug 85, the securing lug 85 then projects into the securing recess 79, as shown in FIGS. 2 to 6. The securing lug 85 thus engages in the securing recess 79, as a result of which there is protection against rotation or a fixation against rotation.
• the cylinder 3 can first be unscrewed from the main section 2i of the base body 2 .
• the piston K remains on the front end section 9 due to the anti-twist protection by means of the safety lug 85 and the safety cutout 79.
• 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.
• the securing recess 79 is moved away from the front end section 9 along the radial extension direction of the guide lug 85 , so that the securing lug 85 no longer engages with the securing recess 79 .
• the dimensions of the securing lug 85 and the securing recess 79 in the longitudinal direction of the piston rod 8 are selected in the embodiment described so that after a complete rotation (360 °) of the piston K, the end 78 of the wall of the hollow-cylindrical fastening section 75 die Safety lug 85 just no longer touched. This means that the piston K can be unscrewed further since there is no longer any anti-twist protection.
• the second check valve 22 with its valve body 22i, its valve spring 222 and its seal 22s is freely accessible and can be cleaned and serviced.
• the piston K can then be screwed on again in the manner already described, so that the desired anti-twist protection is provided by the locking lug 85 engaging in the locking recess 79 .
• the rear end section 12 of the piston rod 8 is connected to a connecting piece 23 (FIG. 1 and FIGS. 13-16) which is rotatably mounted in the rear handle part 15 and has a hose attachment 24 .
• a bottle attachment 26 with a piercing spike 27 (Fig. 1) is mounted, which can pierce, for example, through a membrane of a bottle attachment 26 attached to a medication bottle (not shown). , when the medication bottle is attached to the bottle attachment 26.
• the bottle attachment 26 also has a hose attachment 28 which is in fluid communication with the piercing spike 27 . Two ends of a hose 29 are pushed onto the two hose attachments 28 and 24 so that there is a fluid connection 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 via the connecting piece 23 .
• the bottle attachment 26 also has a ventilation channel 30 running in the puncture spike 27, which is connected to the environment via a third non-return valve 31 in order to avoid the formation of too great a negative pressure in the medication bottle when the liquid is removed.
• the syringe 1 is designed as a so-called self-filling syringe, which automatically fills the syringe barrel 3 with the amount of fluid that has been ejected after an ejection process has taken place.
• a user of the syringe 1 can hold the handle 13 in his hand in such a way that his index finger is on the upper section 16, his middle finger, his ring finger and his little finger are on the lower section 17 of the front handle part 14 and the ball of the thumb with the thumb is on the rear handle part 15 issue.
• the user squeezes his hand he moves the rear handle part 15 against the force of the spring F in the direction of the base body 2, whereby the piston rod 8 is moved with its front end section 9 and thus with the piston K in the syringe cylinder 3 along the displacement direction 10 to the front discharge end 4.
• the first non-return valve 6 closes and a negative pressure builds up inside the syringe cylinder 3, which causes the second non-return valve 22 in the front end section 9 to open and fluid to be sucked out of the medication bottle into the interior of the syringe cylinder 3.
• the rearward 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 barrel 3 is again completely filled with fluid to be dispensed.
• a channel 35 formed in the connecting piece 23 is essentially V-shaped, the connecting piece 23 having a base element 36 with a connection 37 for the rear end section 12 of the piston rod 8 and the hose attachment extending obliquely thereto 24 has.
• Two laterally extending pivot pins 38, 39 are formed on the base element 36 and are inserted into corresponding receptacles 40 (FIGS. 17-19) of the rear handle part 15, so that the connecting piece 23 is rotatably mounted.
• This configuration of the syringe 1 means that 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. It can also be said that the rear end section 12 of the piston rod 8 is fixed to the rear handle part 15 in a connection area such that only relative pivoting about a second pivot axis which runs through the connection area is possible. As can be seen in particular from FIGS. 17-19 in conjunction with FIG.
• the second pivot axis preferably extends perpendicular to the direction of displacement 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 portion 12 of the piston rod 8 on the rear handle part 15 can pointing away from the base body 2 rear side 41 of the rear handle part 15 ergonomically for better handling Syringe 1 can be formed. So the rear page 41 and thus in particular de. the portion of the rear side 41 opposite the connection area is continuous (without gaps or holes) and has a corresponding ergonomic shape for a user's hand.
• the piston rod 8 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 relative pivoting about the second pivot axis is possible, the piston rod 8 is provided with a predetermined elasticity that allows the piston rod 8 to bend. Thus, when the rear handle part 15 is pivoted towards the front handle part 14, a movement component can occur transversely to the displacement direction (or transversely to the longitudinal direction of the piston rod) (in FIG. 1 e.g. from bottom to top).
• the elasticity is designed in such a way that only such deflection of the piston rod 8 occurs that does not affect 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 displacement direction 10 to the front delivery end 4, so that the displacement of the piston K in the syringe cylinder 3 takes place without any problems.
• the syringe 1 also has a dosing device 50 arranged on the base body 2, with which the maximum fluid volume that can be dispensed can be adjusted and set.
• the dosing device 50 comprises a rotating element 51 which is arranged at the rear end of the base body 2 and has an end cap 61 (FIG. 1).
• the rotary element 51 comprises a cylindrical grip section 52, an adjoining cylindrical latching section 53 and an adjoining cylindrical inner section 54 with latching lugs 55, as can be seen particularly well in Figures 20 to 22, with the end cap 61 not being shown in Figures 20 to 22 is.
• a cylindrical channel 56 is formed inside the rotary element 51, through which the piston rod 8 runs and is guided.
• Abutment elements 58 e.g.
• ribs 58 spaced apart from one another in the circumferential direction are formed around the channel 56 on a helical base web 57, which here preferably have the same height, so that their stop surfaces 59 pointing away from the base web 57 are at different distances in the displacement direction 10 to the front delivery end 4 have.
• a groove 60 running in the longitudinal direction is provided for each stop element 58 on the outside of the cylindrical latching section 53 .
• the rotary element 51 is rotatably mounted on the base body 2, with the piston rod 8 extending through the channel 56.
• the main section 2i of the base body 2 has a protruding engagement element 62 in the area of the cylindrical grid section 53, which engages with one of the longitudinal grooves 60 depending on the rotational position of the rotary element 51.
• the piston rod 8 has a piston rod stop 65 with a stop surface 66 which extends radially from the main section 81 of the piston rod.
• the piston rod 8 can now be moved towards the front discharge 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 defines 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 barrel 3 .
• the desired maximum ejection volume can be set by rotating the rotary element 51 by operating the handle section 52. This is defined by the stop element 58 on the helical base track 57 which is opposite the piston rod stop 65 .
• the maximum ejection volume can thus be defined in a simple manner, so that it is ensured that a user can always dispense the defined volume of the fluid in the syringe barrel via the front dispensing end 4 .
• the stop faces 59 of immediately adjacent stop elements 1.3 mm can be spaced apart from one another in the displacement direction 10, whereby the ejection volume can be adjusted in 0.5 ml increments from 0.5 ml to 10 ml.

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• Health & Medical Sciences (AREA)
• Veterinary Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• Engineering & Computer Science (AREA)
• Public Health (AREA)
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