CN114681718B - Multiple quantitative injector - Google Patents

Multiple quantitative injector Download PDF

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Publication number
CN114681718B
CN114681718B CN202210330433.8A CN202210330433A CN114681718B CN 114681718 B CN114681718 B CN 114681718B CN 202210330433 A CN202210330433 A CN 202210330433A CN 114681718 B CN114681718 B CN 114681718B
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CN
China
Prior art keywords
limiting
positioning
piston rod
injection
along
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210330433.8A
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Chinese (zh)
Other versions
CN114681718A (en
Inventor
侯士双
陈常娇
袁霞林
杨林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Ruiai Product Design Co ltd
Original Assignee
Ningbo Ruiai Product Design Co ltd
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Priority to CN202210330433.8A priority Critical patent/CN114681718B/en
Publication of CN114681718A publication Critical patent/CN114681718A/en
Application granted granted Critical
Publication of CN114681718B publication Critical patent/CN114681718B/en
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Classifications

    • 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
    • A61M5/24—Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic
    • 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
    • A61M5/31—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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31535—Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
    • A61M5/31536—Blocking means to immobilize a selected dose, e.g. to administer equal doses
    • 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
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
    • A61M5/31551—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe including axial movement of dose setting member
    • 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
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/31576—Constructional features or modes of drive mechanisms for piston rods
    • A61M5/31578—Constructional features or modes of drive mechanisms for piston rods based on axial translation, i.e. components directly operatively associated and axially moved with plunger 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
    • A61M5/31—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
    • A61M5/31565—Administration mechanisms, i.e. constructional features, modes of administering a dose
    • A61M5/3159—Dose expelling manners
    • A61M5/31593—Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

The invention relates to a multiple quantitative injector, which comprises a tube body; the medicine bottle is internally provided with a piston capable of moving up and down; the lower end of the piston rod is inserted into the medicine bottle and positioned above the piston, a plurality of positioning grooves are formed in the peripheral wall of the piston rod at intervals along the length direction of the piston rod, and each positioning groove extends along the circumferential direction of the piston rod; the outer peripheral wall of the piston rod is also provided with a plurality of connecting grooves, and two axially adjacent positioning grooves are communicated through one connecting groove; the injection rod is arranged in the tube body, the injection rod is positioned above the medicine bottle and sleeved on the piston rod, the injection rod can circumferentially rotate relative to the piston rod and can upwardly move relative to the piston rod, the positioning block is arranged on the inner peripheral wall of the injection rod, the positioning block can sequentially slide into each positioning groove from bottom to top along the connecting groove, and the positioning block can be vertically limited in the corresponding positioning groove. In the whole process, the force for driving the injection rod to move downwards is completely human force, the spring is not relied on, the injection precision is high, and the accuracy of the injection dosage of each time is ensured.

Description

Multiple quantitative injector
Technical Field
The invention relates to the technical field of medical appliances, in particular to a multiple quantitative injector.
Background
A multi-shot syringe is a medicine injection device capable of dividing a medicine liquid in a medicine bottle into a plurality of shots to be injected into a user. The injector with multiple injections can be used for multiple times, so that the requirement of a patient is met. For example, diabetics typically require long-term insulin injections to control the condition, with small amounts per injection. If a small syringe is used each time, waste is caused. To avoid waste and reduce the cost of use, a single large syringe may be used for multiple doses.
The Chinese patent application No. CN202110561355.8 (publication No. CN 113384776A) discloses a multi-injection medicine injection device, which comprises a shell, a plunger rod axially slidably arranged on the shell, a driving spring arranged in the shell, and a locking sleeve circumferentially rotatably arranged in the shell and sleeved outside the plunger rod; the outer side of the plunger rod is provided with a plunger convex part; the drive spring drives the plunger rod to always have a trend of moving towards the injection direction; the locking sleeve is provided with a locking step structure for the plunger convex part to abut so as to restrain the plunger rod from moving towards the injection direction; after the locking sleeve rotates a designated angle towards the unlocking direction, the plunger convex part is separated from the locking step structure and forms an injection stroke with the next step surface of the locking step structure, and under the action of the driving spring, the plunger rod moves towards the injection direction until the plunger convex part is abutted with the next step surface of the locking step structure, so that the medicine is quantitatively injected for a plurality of times.
The plunger rod (corresponding to the following plunger rod) of the patent needs to move towards the front end direction under the action of the driving spring to perform injection, but if the spring is aged after multiple uses, the injection precision is not high, and the injection dosage is controlled inaccurately, so that the treatment effect is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multiple quantitative injector with high injection precision aiming at the current state of the art.
The technical scheme adopted for solving the technical problems is as follows: a multiple quantitative injector comprises
A tube body;
the top of the medicine bottle is open, and a piston capable of moving up and down is arranged in the medicine bottle;
the piston rod is arranged in the tube body, the lower end of the piston rod is inserted into the medicine bottle and positioned above the piston, a plurality of positioning grooves are formed in the peripheral wall of the piston rod at intervals along the length direction of the piston rod, and each positioning groove extends along the circumferential direction of the piston rod;
the outer peripheral wall of the piston rod is also provided with a plurality of connecting grooves, and two axially adjacent positioning grooves are communicated through one connecting groove;
the syringe also comprises
The injection rod is arranged in the tube body, the injection rod is positioned above the medicine bottle and sleeved on the piston rod, the injection rod can circumferentially rotate relative to the piston rod and can upwardly move relative to the piston rod, the positioning block is arranged on the inner peripheral wall of the injection rod, the positioning block can sequentially slide into each positioning groove from bottom to top along the connecting groove, and the positioning block can be vertically limited in the corresponding positioning groove.
In order to enable the injection rod to always rotate along one direction, two axially adjacent positioning grooves are arranged in a staggered mode in the circumferential direction of the piston rod, and the connecting grooves extend along the axial direction and the circumferential direction of the piston rod. If all the positioning grooves are arranged in a straight line in the axial direction of the piston rod, the rotation directions of the adjacent two injection rods are different, so that the difficulty of the user in use is increased, and the user easily forgets to record the rotation direction of the last injection rod.
In order to guide the movable track of the injection rod, the positioning blocks are accurately moved into the corresponding positioning grooves, preferably, the number of the positioning grooves through which the injection rod rotates for a circle is N, N is more than or equal to 2, the injector also comprises a guide pipe fixedly arranged in the pipe body, the injection rod is movably arranged in the guide pipe in a penetrating mode, N guide surfaces which are sequentially connected end to end along the circumferential direction are arranged on the guide pipe, each guide surface comprises a first transverse section and a second transverse section which are arranged at intervals along the axial direction of the guide pipe, the first transverse section is positioned below the second transverse section, the first transverse section and the second transverse section are arranged in a staggered mode in the circumferential direction of the guide pipe, the tail ends of the first transverse section and the initial ends of the second transverse section are connected through inclined sections, and the distance between the first transverse section and the second transverse section in the axial direction of the guide pipe is the same as the axial distance between the adjacent two positioning grooves on the piston rod;
the first transverse sections of two adjacent guide surfaces are positioned on the same circumference, the first transverse sections are connected with the second transverse sections of the adjacent guide surfaces through vertical sections extending along the axial direction of the guide pipe, and the peripheral wall of the injection rod is provided with guide blocks capable of sliding along the guide surfaces.
Before each injection, the injection rod needs to rotate by 360 degrees/N;
when the guide block slides along one of the guide surfaces (defined as the first guide surface): when the guide block slides along the first transverse section, the positioning block moves along the circumferential direction of one of the positioning grooves (defined as a first positioning groove); when the guide block moves along the inclined section, the positioning block moves along the circumferential direction and the axial direction of the connecting groove, and when the guide block moves along the second transverse section, the positioning block enters an adjacent positioning groove (defined as a second positioning groove) above the first positioning groove;
when the guide block slides over the tail end of the second transverse section and faces the starting end of the first transverse section of the adjacent guide surface, the guide block can move along the vertical section, and at the moment, because the positioning block is vertically limited in the second positioning groove, the injection rod drives the piston rod to synchronously move downwards to perform injection of one dose;
the guide block is then located at a first transverse section of the guide surface adjacent to the first guide surface (defined as the second guide surface): the guide block moves along the first transverse section, the positioning block slides out of the second positioning groove, when the guide block moves along the inclined section, the positioning block moves along the circumferential direction and the axial direction of the connecting groove, and when the guide block moves along the second transverse section, the positioning block enters an adjacent positioning groove (defined as a third positioning groove) above the second positioning groove;
when the guide block moves along the vertical section, the positioning block is vertically limited in the third positioning groove, and the injection rod drives the piston rod to synchronously move downwards at the moment, so that one dose is injected;
repeating the above steps until the injection of all the liquid medicine is completed.
When the guide block slides over the tail end of the second transverse section and faces the starting end of the first transverse section of the adjacent guide surface, if the injection rod continues to rotate, the positioning block slides out of the second positioning groove, after the second positioning groove releases the vertical limit of the positioning block, the piston rod cannot drive the injection rod to move downwards, so that the injection rod needs to be limited to continue to rotate, preferably, the rotation direction of the injection rod is defined as a first direction, the injection rod is further sleeved with a fixedly arranged limiting pipe, the limiting pipe and the guide pipe are sequentially arranged along the axial direction of the injection rod, N first limiting blocks are arranged on the limiting pipe at intervals along the circumferential direction of the limiting pipe, and when the positioning block slides over the tail end of the second transverse section and faces the starting end of the first transverse section of the adjacent guide surface, the first limiting block is positioned on the moving path of the guide block and abuts against the guide block when the injection rod rotates along the first direction, so that the injection rod cannot continue to rotate;
when the guide block is abutted against the initial end of the first transverse section of the adjacent guide surface, the first limiting block and the guide block are staggered in the circumferential direction of the limiting pipe. Because the injection rod drives the piston rod to move downwards to complete injection at the moment, the first limiting block needs to be released from the limitation of the guide block at the moment, so that the injection rod can continue to rotate to perform the next injection.
When the guide block slides through the tail end of the second transverse section and faces the starting end of the first transverse section of the adjacent guide surface, the continuous rotation of the injection rod is required to be limited, and the reverse rotation of the injection rod is prevented, otherwise, the guide block is propped against the second transverse section, so that the injection rod cannot move downwards, the piston rod cannot move downwards for injection, N second limiting pieces are arranged on the limiting pipe at intervals along the circumferential direction of the limiting pipe, corresponding blocking parts are arranged on the peripheral wall of the injection rod, the second limiting pieces can move along the radial direction of the limiting pipe, and the second limiting pieces are positioned on the moving path of the blocking parts and propped against the blocking parts when the injection rod reversely rotates along the first direction under the state that the first limiting pieces prop against the positioning blocks so as to limit the reverse rotation of the injection rod.
The second limiting piece can have various structural forms, such as a spring plate, preferably, a first through hole penetrating through the wall thickness of the limiting pipe is formed in the limiting pipe, the second limiting piece is arranged in the first through hole, the second limiting piece comprises a first connecting arm, one end of the first connecting arm is connected with the side wall of the first through hole, and a second limiting block is arranged at the other end of the first connecting arm, the first connecting arm extends along the circumferential direction of the limiting pipe, and the first connecting arm keeps the trend of moving inwards along the radial direction of the limiting pipe under the action of the first elastic piece;
the peripheral wall of the injection rod is provided with a groove along the axial direction of the injection rod, the cross section of the groove is L-shaped, and the second limiting block can be abutted against the side wall of the groove, namely the blocking part. The first connecting arm is equivalent to an elastic arm, and when the injection rod rotates along the first direction, the first connecting arm moves outwards along the radial direction, so that interference on the rotation of the injection rod is avoided; when the injection rod rotates to the position, corresponding to the second limiting block, of the groove, the first connecting arm moves inwards in the radial direction along the limiting pipe under the action of the first elastic piece, so that the second limiting block abuts against the side wall of the groove, and reverse rotation of the injection rod is prevented.
In order to prevent the injection rod from moving upwards, the piston rod is driven to move upwards, the peripheral wall of the piston rod is provided with limiting grooves, the number of the limiting grooves is not less than that of the positioning grooves, and a plurality of limiting grooves are arranged at intervals along the axial direction of the piston rod;
the piston rod is sleeved with a positioning tube fixedly arranged in the tube body, the positioning tube is provided with a second through hole penetrating through the wall thickness of the positioning tube, a positioning piece is arranged in the second through hole and comprises an extension arm with one end connected with the side wall of the through hole and a lug arranged at the other end of the extension arm, the extension arm axially extends along the positioning tube, the lug can be buckled in the limiting groove, and the wall surface of the lug opposite to the limiting groove is an inclined surface inclined towards the limiting groove from top to bottom. The lug can prevent the piston rod from upwards moving, the extension arm is equivalent to an elastic arm, when the piston rod moves downwards, the inclined plane on the lug forces the piston rod to move outwards along the radial direction of the piston rod, the downward movement of the piston rod cannot be limited, namely the injection of the piston rod cannot be influenced until the lug is buckled in the next limiting groove.
In order to enable the structure on the piston rod to be compact, all the limiting grooves are distributed along the axial direction of the piston rod in a straight line basically, and part of the positioning grooves and the limiting grooves are located on the same straight line basically along the axial direction of the piston rod, and the part of the positioning grooves are also used as the limiting grooves. Thus, the part of the positioning grooves are dual-purpose, and the number of the limiting grooves can be reduced.
Preferably, the positioning groove and the limiting groove used as the limiting groove are alternately arranged in sequence along the axial direction of the piston rod. Therefore, the buckling of the positioning block in the positioning groove is not affected.
In order to facilitate the rotation of the injection rod, the upper end of the injection rod is fixedly provided with a handle exposed out of the tube body.
Compared with the prior art, the invention has the advantages that: according to the invention, the injection rod is arranged, the positioning blocks are arranged on the inner peripheral wall of the injection rod, the positioning blocks can sequentially slide into the positioning grooves from bottom to top along the connecting grooves, and the positioning blocks can be vertically limited in the positioning grooves, so that the injection rod can drive the piston rod to gradually move downwards for carrying out quantitative injection of liquid medicine for multiple times along with the sequential sliding of the positioning blocks into the positioning grooves from bottom to top, and in the whole process, the force for driving the injection rod to move downwards is completely manpower without depending on a spring, so that the injection precision is high, and the accuracy of injection dosage of each time is ensured.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention (before venting, in an uninjected state);
FIG. 2 is a cross-sectional view of FIG. 1 with the cap removed (semi-sectioned longitudinally from the locating block);
FIG. 3 is a cross-sectional view of FIG. 1 with the cap removed (half-cut longitudinally from the boss);
FIG. 4 is a partially exploded view of FIG. 1;
FIG. 5 is a schematic view of the injection rod of FIG. 4;
FIG. 6 is a schematic view of the spacing tube of FIG. 4;
fig. 7 is a schematic view of the guide tube of fig. 4 (a view after the tube body is peeled off);
FIG. 8 is a cross-sectional view of the body, stopper tube, guide tube of FIG. 4;
FIG. 9 is a schematic view of the partial structure of FIG. 1 after the tube body has been stripped off and the handle outer race has been removed;
FIG. 10 is a cross-sectional view of FIG. 1 (cross-sectional view from the second stop block);
FIG. 11 is a schematic view showing the cross-sectional view of the injection completed state with the guide block and the first stopper;
FIG. 12 is a cross-sectional view (half longitudinal cross-section from the positioning block after venting, in the injection completed state) of an embodiment of the present invention;
FIG. 13 is a cross-sectional view (half-section longitudinally from the boss after venting, in the injection-completed state) of an embodiment of the present invention;
FIG. 14 is a cross-sectional view (half longitudinal cross-section from the positioning block after venting, in an uninjected state) of an embodiment of the present invention;
FIG. 15 is a partially exploded view of FIG. 14;
fig. 16 is a schematic view of the protective sheath of fig. 15.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 to 16, the multiple dose syringe of the present preferred embodiment includes a tube body 0, a vial 1, a piston rod 2, an injection rod 3, a guide tube 4, a positioning tube 5, a stopper tube 6, and a bracket 7. Define the injection direction of the injector as top down.
As shown in fig. 1 and 2, the top of the bracket 7 is open, the outside of the bracket 7 is detachably sleeved with a cap 70, the cap 70 is pulled out each time the syringe is used, and the cap 70 is sleeved after the injection is completed.
The medicine bottle 1 is placed in the bracket 7 from top to bottom, the top of the medicine bottle 1 is also open, a piston 11 capable of moving up and down is arranged in the medicine bottle 1, the piston rod 2 is arranged in the pipe body 0, the lower end of the piston rod 2 is inserted into the medicine bottle and is positioned above the piston 11, and the piston rod 2 moves downwards to push the piston 11 so as to inject the medicine liquid in the medicine bottle 1.
As shown in fig. 2 to 4, a plurality of positioning grooves 21 and a plurality of connecting grooves 22 are provided on the outer peripheral wall of the piston rod 2, the plurality of positioning grooves 21 are provided at intervals along the axial direction of the piston rod 2, and two adjacent positioning grooves 21 are communicated through one connecting groove 22. In this embodiment, two axially adjacent positioning grooves 21 are arranged in a staggered manner in the circumferential direction of the piston rod 2, the connecting groove 22 extends in the axial direction and the circumferential direction of the piston rod 2, and each positioning groove 21 extends in the circumferential direction of the piston rod 2.
The injection rod 3 is arranged in the tube body 0, the injection rod 3 is arranged above the medicine bottle 1 and sleeved on the piston rod 2, the injection rod 3 can rotate circumferentially relative to the piston rod 2 and can move upwards relative to the piston rod 2, a positioning block 31 is arranged on the inner peripheral wall of the injection rod 3, the positioning block 31 can sequentially slide into each positioning groove 21 from bottom to top along the connecting groove 22, the top and the bottom of each positioning groove 21 are closed, and the positioning block 31 can only be limited in the positioning groove 21 vertically. When the positioning block 31 is positioned in the positioning groove 21, the injection rod 3 can drive the piston rod 2 to move downwards so as to realize injection of liquid medicine; the positioning blocks 31 are sequentially limited in the positioning grooves 21, so that the injection rod 3 can sequentially drive the piston rod 2 to move downwards, and multiple quantitative injections of the liquid medicine are realized.
The number of the positioning grooves 21 through which the injection rod 3 rotates by one turn (360 DEG) is N, N is more than or equal to 2, and the angle at which the injection rod 3 needs to rotate before each injection is 360 DEG/N. In the embodiment, N is 2, and the injection rod 3 rotates 180 degrees each time, so that one dose injection is realized; moreover, because the two axially adjacent positioning grooves 21 are arranged in a staggered manner in the circumferential direction of the piston rod 2, the injection rod 3 always rotates in one direction (clockwise or anticlockwise), so that the positioning blocks 31 are sequentially limited in the positioning grooves 21, the rotation direction of the injection rod 3 does not need to be continuously changed, and the use of a user is facilitated. A handle 30 exposed to the tube body 0 is fixedly provided at the upper end of the injection rod 3 so as to facilitate the rotation of the injection rod 3.
As shown in fig. 7, 8 and 9, the guide tube 4 serves to guide the moving track of the injection rod 3, so that the positioning block 31 is accurately moved into the corresponding positioning groove 21. The injection rod 3 movably penetrates through the guide tube 4, N guide surfaces 41 are sequentially connected end to end along the circumferential direction are arranged on the guide tube 4, in this embodiment, the N guide surfaces 41 are arranged on the end surface of the guide tube 4 and are sequentially connected end to end, specifically, each guide surface 41 comprises a first transverse section 411 and a second transverse section 412 which are arranged at intervals along the axial direction of the guide tube 4, the axial intervals are achieved by arranging concave parts extending along the circumferential direction on the end surface of the guide tube 4, that is, the first transverse section 411 is arranged at the bottom surface of the concave parts, the second transverse section 412 is arranged at the top surface of the concave parts (that is, on the end surface of the guide tube 4), so that the first transverse section 411 is arranged below the second transverse section 412, the first transverse section 411 and the second transverse section 412 are arranged in a staggered mode in the circumferential direction of the guide tube 4, the tail end of the first transverse section is connected with the starting end of the second transverse section 412 through the inclined section, and the distance between the first transverse section 411 and the second transverse section 412 in the axial direction of the guide tube 4 is the same as the distance between two adjacent axial grooves 2 on the axial direction of the guide tube 4.
And also requires: the first transverse sections 411 of two adjacent guide surfaces 41 are located on the same circumference, the first transverse sections 411 and the second transverse sections 412 of the adjacent guide surfaces 41 are connected through the vertical sections 42 extending along the axial direction of the guide tube 4, and the outer peripheral wall of the injection rod 3 is provided with the guide blocks 33 capable of sliding along the guide surfaces 41.
As shown in fig. 9, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, if the injection rod 3 continues to rotate, the positioning block 31 slides out of the second positioning slot 21, and once the second positioning slot 21 releases its vertical limit on the positioning block 31, the piston rod 2 cannot drive the injection rod 3 to move downward, so that the injection rod 3 needs to be limited to continue to rotate.
Defining the rotation direction of the injection rod 3 as a first direction, the injection rod 3 is further sleeved with a fixed limiting tube 6, the limiting tube 6 and the guide tube 4 are sequentially arranged along the axial direction of the injection rod 3, N first limiting blocks 61 are arranged on the limiting tube 6 along the circumferential direction at intervals, when the positioning block 31 slides across the tail end of the second transverse section 412 and faces the initial end of the first transverse section 411 of the adjacent guide surface 41, the first limiting blocks 61 are positioned on the moving path of the guide block 33 and are propped against the guide block 33 when the injection rod 3 rotates along the first direction, and thus the injection rod 3 cannot continue to rotate.
As shown in fig. 11, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 can move down along the vertical section 42 to abut against the start end of the first transverse section 411 of the adjacent guide surface 41, so that the injection rod 3 drives the piston rod 2 to move down to complete the injection, after the injection is completed, the first limiting block 61 needs to release the limitation on the guide block 33 so that the injection rod 3 can continue to rotate for the next injection, so that when the guide block 33 moves down along the vertical section 42 to abut against the start end of the first transverse section 411 of the adjacent guide surface 41, the first limiting block 61 and the guide block 33 are staggered in the circumferential direction of the limiting tube 6, and the movement of the guide block along the first transverse section 411 is not hindered.
Also, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, not only the continued rotation of the injection rod 3 in the first direction needs to be limited, but also the reverse rotation thereof needs to be prevented, otherwise, the guide block 33 abuts against the second transverse section 412 on the original guide surface 41, which results in that the injection rod 3 cannot be moved down, and thus the piston rod 2 cannot be moved down for injection.
As shown in fig. 4, 5, 6, 9 and 10, the stopper tube 6 is provided with N first through holes 62 penetrating the wall thickness thereof at intervals along the circumferential direction thereof, each first through hole 62 is provided with a second stopper 63, the second stopper 63 comprises a first connecting arm 631 having one end connected to the side wall of the first through hole 62 and a second stopper 632 provided at the other end of the first connecting arm 631, the first connecting arm 631 extends along the circumferential direction of the stopper tube 6, and the first connecting arm 631 maintains a tendency to move radially inwardly (herein, in a direction toward the center line of the stopper tube 6) along the stopper tube 6 under the action of the first elastic member 633. In this embodiment, two second limiting members 63 are provided, the first elastic member 633 is an arc-shaped elastic sheet extending along the circumferential direction of the limiting tube 6, two ends of the elastic sheet are respectively coated on the outer surfaces of the two second limiting members 632, and two corresponding grooves 32 are also provided.
The outer peripheral wall of the injection rod 3 is provided with a groove 32 along the axial direction thereof, the cross section of the groove 32 is L-shaped, the second limiting block 632 can be abutted against the side wall of the groove 32, namely the blocking part 321, the side wall of the groove 32 is provided with the second limiting block 632 which is positioned on the moving path of the blocking part 321 when the injection rod 3 reversely rotates along the first direction under the state that the first limiting block 61 is abutted against the guide block 33, and the blocking part 321 is abutted against under the action of the first elastic piece 633, so that the aim of preventing the reverse rotation of the injection rod 3 is fulfilled.
The first connecting arm 631 is equivalent to an elastic arm, and when the injection rod 3 rotates in a first direction (clockwise in fig. 10), the first connecting arm 631 can move radially outwards (outwards refers to a direction far away from the central line of the limiting tube 6 here) after overcoming the acting force of the first elastic element 633, so that the rotation of the injection rod 3 is not interfered; when the injection rod 3 rotates to the position corresponding to the groove 32 and corresponds to a second limiting block 632, the first connecting arm 631 moves inwards along the radial direction of the limiting tube 6 under the action of the first elastic element 633, so that the second limiting block 632 is propped against the side wall of the groove 32 again, and the reverse rotation of the injection rod 3 is prevented.
In summary, when the guide block 33 slides over the end of the second transverse section 412 and faces the beginning of the first transverse section 411 of the adjacent guide surface 41, the injection rod 3 is blocked from rotating by the first limiting block 61 and the second limiting block 632, and the injection rod 3 can only move axially downwards, so that the guide block 33 moves downwards along the vertical section 42 to abut against the beginning of the first transverse section 411 of the adjacent guide surface 41, and one injection is completed.
As shown in fig. 3, 4, 8 and 11, the outer peripheral wall of the piston rod 2 is further provided with a limiting groove 23, the number of the limiting grooves 23 is not less than that of the positioning grooves 21, and the plurality of limiting grooves 23 are arranged at intervals along the axial direction of the piston rod 2. The positioning tube 5 is sleeved on the piston rod 2, a second through hole 51 penetrating through the wall thickness of the positioning tube 5 is formed in the positioning tube 5, a positioning piece 52 is arranged in the second through hole 51, the positioning piece 52 comprises an extension arm 521 with one end connected with the side wall of the second through hole 51 and a bump 522 arranged at the other end of the extension arm 521, the extension arm 521 extends along the axial direction of the positioning tube 5, the bump 522 can be buckled in the limit groove 23, the wall surface of the bump 522 facing the limit groove 23 is an inclined surface 5221 inclined towards the limit groove 23 from top to bottom (the inclined surface 5221 enables the thickness of the bump 522 to be gradually thickened from top to bottom). When the projection 522 is locked in the limit groove 23, the projection 522 can prevent the piston rod 2 from moving upwards, and when the injection is required, since the extension arm 521 is equivalent to an elastic arm, when the piston rod 2 moves downwards, the inclined surface 5221 on the projection 522 forces the extension arm 521 to move outwards along the radial direction of the piston rod 2 (the direction away from the central line of the piston rod 2 is outwards pointed here), so that the downward movement of the piston rod 2 is not limited, that is, the injection of the piston rod 2 is not influenced, until the projection 522 is locked in the next limit groove 23, and the upward movement of the piston rod 2 is prevented again.
Since the piston rod 2 is axially movable, all the positioning grooves 23 are substantially aligned in the axial direction of the piston rod 2, and a part of the positioning grooves 21 and the positioning grooves 23 are substantially aligned in the axial direction of the piston rod 2, and the part of the positioning grooves 21 also serve as the positioning grooves 23. Thus, the number of the limit grooves 23 can be reduced by using the two-purpose positioning grooves 21, and the positioning grooves 21 used as the limit grooves 23 and the limit grooves 23 are alternately arranged along the axial direction of the piston rod 2. This does not affect the locking operation of the positioning block 31 in the positioning groove 21.
The injection procedure of the syringe of this example was as follows:
as shown in fig. 2 and 3, in the initial state, the positioning block 31 is located in the lowermost positioning groove 21 (for convenience of description, the positioning groove 21 is defined as the first positioning groove 21), and the projection 522 is snapped into the lowermost limiting groove 23 (for convenience of description, the limiting groove 23 is defined as the first limiting groove 23);
rotating the handle 30, brings the injection rod 3 into rotation and the guide block 33 slides along one of the guide surfaces 41 (defined as the first guide surface 41): the guide block 33 slides along the first transverse section 411, the positioning block 31 moves along the circumferential direction of the first positioning groove 21, and the protruding block 522 is still buckled in the first limiting groove 23;
when the guide block 33 moves along the inclined section 413, the positioning block 31 moves in the circumferential direction and the axial direction of the connecting groove 22, and when the guide block 33 moves along the second lateral section 412, the positioning block 31 enters into the adjacent positioning groove 21 (defined as the second positioning groove 21) above the first positioning groove 21;
as shown in fig. 9 and 10, when the guide block 33 slides over the end of the second transverse section 412 and faces the start end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 abuts against the first limiting block 61 on the limiting tube 6, the second limiting block 632 on the limiting tube 6 abuts against the side wall of the groove 32 on the injection rod 3, the injection rod 3 cannot rotate and can only move axially, the guide block 33 moves along the vertical section 42, because the positioning block 31 is vertically limited in the second positioning groove 21, the injection rod 3 drives the piston rod 2 to move synchronously downwards at this time to perform one dose injection, and the protruding block 522 is also buckled in the adjacent limiting groove 23 (defined as the second limiting groove 23) above the first limiting groove 23;
at the completion of the injection, as shown in fig. 11, the guide block 33 is located at a first transverse section 411 of the guide surface 41 (defined as the second guide surface 41) adjacent to the first guide surface 41, and if the next injection is to be performed, the guide block 33 will slide along the second guide surface 41: the guide block 33 moves along the first transverse section 411, the positioning block 31 slides out of the second positioning groove 21, and when the guide block 33 is propped against the first transverse section 411, the vertical section 42 connected with the first guide surface 41 and the second guide surface 41 is positioned on the moving path of the guide block 33 when the injection rod 3 reversely rotates along the first direction, so that the injection rod 3 is prevented from reversely rotating;
the positioning block 31 moves in the circumferential direction and the axial direction of the connecting groove 22 when the guide block 33 moves along the inclined section 413, and the positioning block 31 enters the adjacent positioning groove 21 (defined as the third positioning groove 21) above the second positioning groove 21 when the guide block 33 moves along the second lateral section 412;
when the guide block 33 slides over the end of the second transverse section 412 and faces the beginning end of the first transverse section 411 of the adjacent guide surface 41, the guide block 33 abuts against the first limiting block 61 on the limiting tube 6, the second limiting block 632 on the limiting tube 6 abuts against the side wall of the groove 32 on the injection rod 3, the injection rod 3 cannot rotate and can only move axially, the guide block 33 moves along the vertical section, because the positioning block 31 is vertically limited in the third positioning groove 21, the injection rod 3 drives the piston rod 2 to move downwards synchronously, and then a dose is injected, and the protruding block 522 is also buckled in the adjacent limiting groove 23 (defined as the third limiting groove 23) above the second limiting groove 23;
repeating the above steps until the injection of all the liquid medicine is completed.
In this embodiment, the positioning tube 5 is integrally formed at the lower end of the tube body 0, the guiding tube 4 is formed in the tube body 0, the limiting tube 6 is disposed in the tube body 0 and located above the guiding tube 4, and the limiting tube 6 is fixedly connected with the tube body 0. The pipe body 0 is fixedly arranged, so the guide pipe 4, the positioning pipe 5 and the limiting pipe 6 are fixedly arranged.
Because of the problem of assembly accuracy and the need to reserve space for the liquid medicine and prevent the liquid medicine from overflowing, an axial assembly gap exists between the piston rod 2 and the piston 11, if the gap is not eliminated before injection, the medicine amount injected into a patient body by the injector in the first injection cannot reach the standard, so that before injection, air is exhausted, and the axial gap between the piston rod 2 and the piston 11 is eliminated.
As shown in fig. 14 to 16, in the present embodiment, the exhaust is achieved by the following structure:
the bracket 7 can drive the medicine bottle 1 to move upwards, so that the piston 11 is propped against the lower end of the piston rod 2, the axial gap between the piston 11 and the piston rod 2 is eliminated, and after the piston 11 is propped against the piston rod 2, the bracket 7 is moved upwards for a small distance, so that one drop of medicine liquid flows out, and the air in the medicine liquid is removed, namely, the air is exhausted.
The lower end of the positioning tube 5 is inserted into the bracket 7, and the positioning tube 5 is in threaded connection with the upper part of the bracket 7. It can be seen that the bracket 7 is moved upwards by rotating the bracket 7 to drive the medicine bottle 1 upwards for exhausting.
However, when the air discharge is not needed or the air discharge is completed, the user may rotate the bracket 7 by mistake, so that the medicine bottle 1 moves upwards and the medicine liquid flows out, and waste is caused, and according to the problem, the outer diameter of the pipe body 0 is larger than that of the positioning pipe 5, a protective sleeve 8 is sleeved on the lower part of the pipe body 0 and the upper part of the bracket 7, the protective sleeve 8 can move up and down relative to the pipe body 0 and the bracket 7, a connecting structure for enabling the protective sleeve 8 and the bracket 7 to synchronously rotate is arranged between the protective sleeve 8 and the upper part of the bracket 7, a positioning structure for preventing the protective sleeve 8 from rotating relative to the pipe body 0 is also arranged between the protective sleeve 8 and the pipe body 0, and the restraint of the positioning structure on the protective sleeve 8 can be relieved by the downward movement of the protective sleeve 8.
The protective sheath 8 can prevent the mistake and rotate bracket 7, if will not move protective sheath 8 downwardly, protective sheath 8 can't rotate under the restriction of location structure, and be equipped with connection structure between protective sheath 8 and the bracket 7 again, under the circumstances that protective sheath 8 can not rotate, bracket 7 also can't rotate.
In this embodiment, the connection structure includes a first sliding slot 81 extending vertically and a first sliding block 71 sliding in the first sliding slot 81 all the time, the first sliding slot 81 is provided on the inner peripheral wall of the protective sleeve 8, and the first sliding block 71 is provided on the outer peripheral wall of the bracket 7. Of course, the first slide groove 81 may be provided on the outer peripheral wall of the bracket 7, and the first slider 71 may be provided on the inner peripheral wall of the protective sheath 8.
The positioning structure comprises a second sliding groove 82 extending vertically and a second sliding block 01 capable of moving out of the second sliding groove 82 along the second sliding groove 82, the second sliding groove 82 is arranged on the inner peripheral wall of the protective sleeve 8, the second sliding block 01 is arranged on the outer peripheral wall of the pipe body 0, and of course, the second sliding groove 82 can also be arranged on the outer peripheral wall of the pipe body 0, and the second sliding block 01 is arranged on the inner peripheral wall of the protective sleeve 8.
When the second slide block 01 is in the second slide groove 82, the protective sleeve 8 and the pipe body 0 are fixed in the circumferential direction, and the protective sleeve 8 cannot rotate because the pipe body 0 is fixedly arranged and cannot rotate; when the protective sheath 8 moves down to move the second slider 01 out of the second chute 82, the protective sheath 8 can be rotated.
Under the state that protective sheath 8 links to each other with registration arm 5 through location structure, in order to prevent that protective sheath 8 from moving down, remove location structure's constraint, offered draw-in groove 02 on the periphery wall of registration arm 5, the longitudinal section of draw-in groove 02 is the arc (please see fig. 15), be equipped with elasticity bump 83 on the inner periphery wall of protective sheath 8, under the state that protective sheath 8 links to each other with registration arm 5 through location structure, elasticity bump 83 card is established in draw-in groove 02, protective sheath 8 can not drop down, unless the artificial application of force on protective sheath 8, make elasticity bump 83 warp and break away from draw-in groove 02, protective sheath 8 just can move down and remove location structure's constraint to it.
The exhaust process of this embodiment is as follows:
1. in the initial state, the elastic protruding points 83 are clamped in the clamping grooves 02, the first sliding block 71 is located in the first sliding groove 81, and the second sliding block 01 is located in the second sliding groove 82;
2. the protective sleeve 8 is pulled down to separate the elastic protruding points 83 from the clamping grooves 02, the second sliding block 01 moves out of the second sliding groove 82, then the protective sleeve 8 is rotated, the first sliding block 71 is located in the first sliding groove 81, so that the protective sleeve 8 drives the bracket 7 to rotate, the bracket 7 drives the medicine bottle 1 to move upwards until the lower end of the piston rod 2 abuts against the piston 11, the axial gap between the piston 11 and the piston rod 2 is eliminated, after the piston 11 abuts against the piston rod 2, the bracket 7 is moved upwards for a small distance to enable medicine liquid to flow out, air in the medicine liquid is removed, at the moment, the top of the medicine bottle 1 and the locating tube 5 are extruded to a limit state, and air exhaust is completed.
The lower extreme of registration arm 5 offsets with the top of medicine bottle 1, and the lateral wall of registration arm 5 is gone up and is equipped with the through-hole 53 of two at least fretwork lateral walls along its axial interval, and each through-hole 53 extends along the circumference of registration arm 5, and at least two among them fretwork hole 53 that set up at axial interval misplaces in the circumference of registration arm 5 to make registration arm 5 can elastic deformation in the axial. The positioning tube 5 restricts the upward movement of the medicine bottle 1, and the bracket 7 restricts the downward movement of the medicine bottle 1, and since the positioning tube 5 can be elastically deformed, the upward movement of the medicine bottle 1 is not affected to perform the air discharge.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity.

Claims (5)

1. A multiple quantitative injector comprises a tube body (0) and
the top of the medicine bottle (1) is open, and a piston (11) capable of moving up and down is arranged in the medicine bottle (1);
the piston rod (2) is arranged in the tube body (0), the lower end of the piston rod (2) is inserted into the medicine bottle and is positioned above the piston (11), a plurality of positioning grooves (21) are formed in the peripheral wall of the piston rod (2) at intervals along the axial direction of the piston rod, and each positioning groove (21) extends along the circumferential direction of the piston rod (2);
the piston rod is characterized in that a plurality of connecting grooves (22) are further formed in the peripheral wall of the piston rod (2), and two axially adjacent positioning grooves (21) are communicated through one connecting groove (22);
the syringe further comprises:
the injection rod (3) is arranged in the pipe body (0) and sleeved on the piston rod (2), the injection rod (3) can circumferentially rotate relative to the piston rod (2) and can move upwards relative to the piston rod (2), a positioning block (31) is arranged on the inner peripheral wall of the injection rod (3), the positioning block (31) can sequentially slide into each positioning groove (21) from bottom to top along the connecting groove (22), and the positioning block (31) can be vertically limited in the corresponding positioning groove (21);
the two axially adjacent positioning grooves (21) are arranged in a staggered manner in the circumferential direction of the piston rod (2), and the connecting grooves (22) extend along the axial direction and the circumferential direction of the piston rod (2);
the number of positioning grooves (21) through which the injection rod (3) rotates for one circle is N, N is more than or equal to 2, the injector further comprises a guide tube (4) fixedly arranged in the tube body (0), the injection rod (3) is movably arranged in the guide tube (4) in a penetrating mode, N guide surfaces (41) which are sequentially connected end to end along the circumferential direction are arranged on the guide tube (4), each guide surface (41) comprises a first transverse section (411) and a second transverse section (412) which are arranged at intervals along the axial direction of the guide tube (4), the first transverse section (411) is positioned below the second transverse section (412), the first transverse section (411) and the second transverse section (412) are arranged in a staggered mode in the circumferential direction of the guide tube (4), the tail end of the first transverse section (411) and the starting end of the second transverse section (412) are connected through an inclined section (413), and the distance between the first transverse section (411) and the second transverse section (412) in the axial direction of the guide tube (4) is the same as the distance between two adjacent axial grooves (2) in the axial direction;
the first transverse sections (411) of two adjacent guide surfaces (41) are positioned on the same circumference, the first transverse sections (411) are connected with the second transverse sections (412) of the adjacent guide surfaces (41) through vertical sections extending along the axial direction of the guide pipe (4), and the peripheral wall of the injection rod (3) is provided with guide blocks (33) capable of sliding along the guide surfaces (41);
defining the rotation direction of the injection rod (3) as a first direction, wherein a limiting pipe (6) fixedly arranged in the pipe body (0) is sleeved on the injection rod (3), the limiting pipe (6) and the guide pipe (4) are sequentially arranged along the axial direction of the injection rod (3), N first limiting blocks (61) are arranged on the limiting pipe (6) at intervals along the circumferential direction of the limiting pipe, and when the positioning block (31) slides across the tail end of the second transverse section (412) and faces the initial end of the first transverse section (411) of the adjacent guide surface (41), the first limiting blocks (61) are positioned on the moving path of the guide block (33) and are propped against the guide block (33) when the injection rod (3) rotates along the first direction; when the guide block (33) is abutted against the initial end of the first transverse section (411) of the adjacent guide surface (41), the first limiting block (61) and the guide block (33) are staggered in the circumferential direction of the limiting pipe (6);
n second limiting pieces (63) are further arranged on the limiting pipe (6) at intervals along the circumferential direction of the limiting pipe, corresponding blocking parts (321) are arranged on the outer circumferential wall of the injection rod (3), the second limiting pieces (63) can move along the radial direction of the limiting pipe (6), and in the state that the first limiting pieces (61) are propped against the positioning blocks (31), the second limiting pieces (63) are positioned on the moving path of the blocking parts (321) when the injection rod (3) reversely rotates along the first direction and prop against the blocking parts (321);
the limiting pipe (6) is provided with a first through hole (62) penetrating through the wall thickness of the limiting pipe, the second limiting piece (63) is arranged in the first through hole (62), the second limiting piece (63) comprises a first connecting arm (631) with one end connected with the side wall of the first through hole (62) and a second limiting block (632) arranged at the other end of the first connecting arm (631), the first connecting arm (631) extends along the circumferential direction of the limiting pipe (6), and the first connecting arm (631) keeps the trend of moving inwards along the radial direction of the limiting pipe (6) under the action of a first elastic piece (633);
the injection rod is characterized in that a groove (32) is formed in the peripheral wall of the injection rod (3) along the axial direction of the injection rod, the cross section of the groove (32) is L-shaped, the second limiting block (632) can abut against the side wall of the groove (32), and the side wall of the groove (32) is the blocking part (321).
2. The multiple dose syringe of claim 1, wherein: limiting grooves (23) are formed in the outer peripheral wall of the piston rod (2), the number of the limiting grooves (23) is not less than that of the positioning grooves (21), and a plurality of the limiting grooves (23) are arranged at intervals along the axial direction of the piston rod (2);
the piston rod (2) is sleeved with a positioning pipe (5) fixedly arranged on the pipe body (0), a second through hole (51) penetrating through the wall thickness of the positioning pipe (5) is formed in the second through hole (51), a positioning piece (52) is arranged in the second through hole (51), the positioning piece (52) comprises an extension arm (521) with one end connected with the side wall of the second through hole (51) and a lug (522) arranged at the other end of the extension arm (521), the extension arm (521) axially extends along the positioning pipe (5), the lug (522) can be buckled in a limiting groove (23), and the wall surface, facing the limiting groove (23), of the lug (522) is an inclined surface (5221) inclined towards the limiting groove (23) from top to bottom.
3. The multiple dose syringe of claim 2, wherein: all the limiting grooves (23) are basically arranged in a straight line along the axial direction of the piston rod (2), and part of the positioning grooves (21) and the limiting grooves (23) are basically positioned on the same straight line along the axial direction of the piston rod (2), and the part of the positioning grooves (21) are also used as the limiting grooves (23).
4. A multiple dose syringe as defined in claim 3, wherein: the positioning grooves (21) and the limiting grooves (23) used as the limiting grooves (23) are alternately arranged in sequence along the axial direction of the piston rod (2).
5. The multiple dose syringe of claim 1, wherein: the upper end of the injection rod (3) is fixedly provided with a handle exposed out of the pipe body (0).
CN202210330433.8A 2022-03-30 2022-03-30 Multiple quantitative injector Active CN114681718B (en)

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WO2004030730A2 (en) * 2002-10-01 2004-04-15 Becton, Dickinson And Company Medication delivery pen
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