CN116764036A

CN116764036A - Quantitative injection device

Info

Publication number: CN116764036A
Application number: CN202310634838.5A
Authority: CN
Inventors: 王义俊; 黄龙祥; 郭融
Original assignee: Shanghai Xinyaopaike Medical Technology Co ltd
Current assignee: Shanghai Xinyaopaike Medical Technology Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-09-19

Abstract

The utility model belongs to the technical field of medical instruments, namely pen-type injectors, and particularly relates to a quantitative injection device. The utility model sets the fixed ratchet wheel, the pawl-tube combination unit, the slotted screw unit, the movable ratchet wheel unit and the rotary pawl unit on the shell unit, so that: 1. each rotation action of the rotating pawl unit is a fixed angle, and the pawl-tube combination unit is driven to rotate by a fixed angle, so that each advancing distance of the slotted screw unit is fixed, and the aim of quantitative injection is finally fulfilled; 2. after one injection operation, the reverse rotation reset angle of the rotary pawl unit is fixed, and the pawl-tube combination unit is not driven to reversely rotate together, so that the gap slotting screw unit for the injection operation is ensured to be completely fixed.

Description

Quantitative injection device

Technical Field

The utility model belongs to the technical field of medical instruments, namely pen-type injectors, and particularly relates to a quantitative injection device.

Background

The quantitative injection device is one new type of syringe with medicine inside the syringe capable of being pushed out in equal amount and in batches. The biggest difference compared with the existing common syringes is that an equal amount of batch injection operation can be achieved without the need for a professional medical staff to control the injection volume. Therefore, the quantitative injection device is mostly used in the scene of injection of patients, such as osteoporosis patients, for injecting teriparatum injection into patients.

On the other hand, regarding the structural and functional characteristics of the quantitative injection device, at least the following points are needed:

1. after the single injection operation is finished, the push rod is fixed, so that the medicine can not be pushed forward any more, and can not be retracted backward to a fuzzy position;

2. the distance of each forward movement of the push rod is fixed;

3. the forward movement of the plunger is designed to ensure that it can be used a number of times, for example 1/5 of a dose per injection, and it is designed to ensure that it is pushed at least 5 times in a precise and repeated manner.

For example, chinese patent publication No. CN216169226U and publication day 2022.04.05 discloses a unidirectional pushing type anti-reuse micro and quantitative injector, which structurally comprises an empty cylinder, a rubber plug arranged at the top end of a core rod and positioned in the empty cylinder, an outer sleeve arranged in the opening direction of the empty cylinder, and a quantitative pushing structure arranged in the outer sleeve, wherein quantitative injection is realized through the pushing structure.

The quantitative injector in the patent of the utility model has the main following modes for realizing the effect of 'the push rod is not moved after injection operation': the pushing clamp clamps the core rod;

the mode for realizing the effect of unchanged forward moving distance of the push rod mainly comprises the following steps: the pushing card and the clamping hoop can be periodically clamped;

the mode for realizing the effect of the push rod moving forwards for many times mainly comprises the following steps: the pushing clamp can release the clamping action of the pushing clamp on the core rod by the hand, so that the core rod can move forwards again.

However, the quantitative injector has the greatest defect in the practical use process, and is the technical problem to be solved by the utility model, namely:

after the injection operation of the core rod is finished, the type of the fixed force of the core rod is friction force, the friction force has relatively high instability, and the core rod cannot be guaranteed to have a front-back fixed effect with higher precision.

The structural and functional characteristics are finally embodied on the single quantitative injection dosage, namely that the dosage of each time is difficult to ensure high-precision equality.

In view of the foregoing, there is a need for a new and more stable and clear quantitative injection device with a stable end point indication for quantitative injection operation, so that the difference between the doses of each injection is as small as possible.

Disclosure of Invention

The utility model provides a quantitative injection device, which can be provided with a fixed ratchet wheel, a pawl-tube combination unit, a slotted screw unit, a movable ratchet wheel unit and a rotary pawl unit on a shell unit, so that: 1. each rotation action of the rotating pawl unit is a fixed angle, and the pawl-tube combination unit is driven to rotate by a fixed angle, so that each advancing distance of the slotted screw unit is fixed, and the aim of quantitative injection is finally fulfilled; 2. after one injection operation, the reverse rotation reset angle of the rotary pawl unit is fixed, and the pawl-tube combination unit is not driven to reversely rotate together, so that the slotted screw unit in the gap of the injection operation is ensured to be completely fixed; 3. the rotary pawl unit rotates forward and then reversely every time, namely, the complete injection operation is realized, and the operation can be completely and independently repeated for a plurality of times until the medicine in the card bottle is injected in batches; 4. the single quantitative injection device corresponds to a single card bottle and a plurality of needles, and ensures the effects of multiple injection operations and integral single use in a relatively long time.

The utility model adopts the technical proposal that: the quantitative injection device structurally comprises a shell unit, a fixed ratchet wheel arranged in the shell unit, a pawl-tube combination unit, a slotted screw unit, a movable ratchet wheel unit and a rotating pawl unit, wherein the pawl-tube combination unit is arranged in the shell unit in a plugging mode and connected with the fixed ratchet wheel, the slotted screw unit is arranged on the shell unit in a screwing mode, is clamped with the pawl-tube combination unit and is used for pushing medicines, the movable ratchet wheel unit is arranged in the pawl-tube combination unit in a clamping mode and is used for rotationally driving the pawl-tube combination unit, and the rotating pawl unit is arranged in the shell unit and is used for driving the movable ratchet wheel unit.

The further preferable technical scheme is as follows: the shell unit comprises a tube body, an end plate, an internal threaded hole and an angle limiting block, wherein the end plate is arranged on the tube body, the internal side surface of the end plate is provided with a fixed ratchet, the internal threaded hole is arranged on the end plate and used for installing the slotted screw unit, and the angle limiting block is arranged on the inner annular surface of the tube body and used for blocking and clamping the rotating pawl unit.

The further preferable technical scheme is as follows: the shell unit also comprises an opening arranged on the pipe body and an anti-falling buckle plate arranged on the opening and used for clamping the pawl-pipe combination unit.

The further preferable technical scheme is as follows: the pawl-tube combination unit comprises a middle circular ring arranged on the anti-falling buckle plate, an arc pawl arranged on the middle circular ring and connected with the fixed ratchet wheel, a rear end tube arranged on the middle circular ring and used for being inserted into and installed on the movable ratchet wheel unit, a driving block arranged on the inner annular surface of the middle circular ring and used for being clamped with the grooved screw unit, and a driving groove arranged on the inner annular surface of the rear end tube and used for being clamped with the movable ratchet wheel unit.

The further preferable technical scheme is as follows: the pawl-tube combination unit further includes a fixing port provided on the rear end tube for inserting the rotary pawl unit.

The further preferable technical scheme is as follows: the slotted screw unit comprises a threaded rod which is arranged on the internal threaded hole, is spliced with the pawl-tube combination unit, the movable ratchet wheel unit and the rotary pawl unit and is used for pushing the card type bottle, and a slot which is arranged on the threaded rod and is used for being inserted into the length direction of the driving block.

The further preferable technical scheme is as follows: the movable ratchet wheel unit comprises a supporting spring, a slotted ratchet wheel and a protruding block, wherein the supporting spring is arranged on the middle circular ring and used for allowing the rotary pawl unit to idle, the slotted ratchet wheel is arranged on the supporting spring, and the protruding block is arranged on the slotted ratchet wheel and is clamped with the driving groove.

The further preferable technical scheme is as follows: the rotary pawl unit comprises a rotary tube arranged in the tube body, a convex pawl arranged on the end face of the rotary tube and used for clamping the slotted ratchet wheel, and a fan-shaped convex block arranged on the outer annular surface of the rotary tube and used for clamping the angle limiting block.

The further preferable technical scheme is as follows: the rotary pawl unit further comprises a connecting ring which is arranged on the outer ring surface of the rotary tube and is used for being inserted into the fixed port.

The further preferable technical scheme is as follows: and a sliding tube unit for driving the rotary pawl unit is also arranged in the tube body.

The further preferable technical scheme is as follows: the sliding pipe unit comprises a circular pipe arranged between the pipe body and the rotary pipe, protruding threads arranged on the inner annular surface of the circular pipe, and a length-direction protruding strip arranged on the outer annular surface of the circular pipe;

the shell unit further comprises a chute which is arranged on the inner annular surface of the tube body and used for clamping the lengthwise protruding strip;

the rotary pawl unit further comprises a thread groove which is arranged on the outer annular surface of the rotary pipe and used for connecting the protruding threads.

The further preferable technical scheme is as follows: the pipe body is also sleeved with an outer pipe unit for inserting the mounting clip type bottle and connecting the mounting needle.

The further preferable technical scheme is as follows: the outer tube unit comprises a front end tube, a needle head mounting tube arranged on the front end tube and a rear opening arranged on the front end tube and used for clamping the tube body;

the shell unit also comprises a clamping block which is arranged on the outer ring surface of the tube body and is used for being clamped into the rear opening.

The further preferable technical scheme is as follows: the outer tube unit further comprises a front opening arranged on the front end tube, and a clamping unit for clamping the clamping type bottle is arranged on the front opening.

The further preferable technical scheme is as follows: the buckle unit comprises a ring body arranged in the front end pipe, an outer buckle arranged on the ring body and used for being clamped with the front opening, and an inner buckle arranged on the ring body and used for clamping the clamp type bottle.

The further preferable technical scheme is as follows: the buckle unit further comprises an arc-shaped strip with two ends arranged on the torus and used for receiving the compaction effect of the end plate.

The further preferable technical scheme is as follows: the arc-shaped strip protrudes towards the radial outer side of the torus;

the outer tube unit further comprises an installation positioning groove which is arranged on the inner annular surface of the front end tube and used for clamping the arc-shaped strip.

The further preferable technical scheme is as follows: the housing unit further includes a rectangular opening provided on the end plate for engaging the arcuate strap.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

FIG. 2 is a schematic view of the position of a slotted screw unit in accordance with the present utility model.

Fig. 3 is an exploded view of the pawl-tube combination unit according to the present utility model.

Fig. 4 is an exploded view of the movable ratchet unit according to the present utility model.

Fig. 5 is a schematic structural view of the rotary pawl unit in the present utility model.

Fig. 6 is a schematic diagram showing the mating relationship of the pawl-tube combination unit and the rotary pawl unit in the present utility model.

Fig. 7 is a schematic structural view of the housing unit according to the present utility model.

Fig. 8 is a schematic view of the position of the rectangular opening in the present utility model.

Fig. 9 is a schematic view of the position and shape of the driving block in the present utility model.

Fig. 10 is a schematic view of the structure of the grooved screw unit in the present utility model.

FIG. 11 is a schematic view of the location and shape of the annular projection and attachment ring of the present utility model.

Fig. 12 is a schematic view of the structure of a sliding tube unit in the present utility model.

Fig. 13 is a schematic structural view of an outer tube unit in the present utility model.

Fig. 14 is a schematic view showing the position and shape of the installation positioning groove in the present utility model.

Fig. 15 is a schematic view illustrating a usage mode of the buckle unit in the present utility model.

In the figures, the meaning of each label is as follows:

a clip bottle a;

a shell unit 1, a fixed ratchet wheel 2, a pawl-tube combination unit 3, a slotted screw unit 4, a movable ratchet wheel unit 5 and a rotary pawl unit 6;

the pipe body 101, the end plate 102, the internal thread hole 103, the angle limiting block 104, the opening 105, the anti-falling pinch plate 106, the chute 107, the clamping block 108 and the rectangular opening 109;

a middle circular ring 301, an arc-shaped pawl 302, a rear end pipe 303, a driving block 304, a driving groove 305 and a fixing opening 306;

a threaded rod 401 and a slot 402 in the length direction;

a support spring 501, a slotted ratchet 502, a protruding block 503;

a rotating pipe 601, a convex pawl 602, a fan-shaped convex block 603, a connecting ring 604 and a thread groove 605;

a sliding tube unit 7, an outer tube unit 8 and a buckling unit 9;

a round tube 701, a protruding thread 702, a lengthwise protruding strip 703;

nib tube 801, needle mounting tube 802, rear opening 803, front opening 804, mounting location groove 805;

a torus 901, an outer button 902, an inner button 903, and an arcuate strap 904;

a cap 10.

Detailed Description

The following description is of the preferred embodiments of the utility model and is not intended to limit the scope of the utility model.

As shown in fig. 1 to 15, the quantitative injection device structurally comprises a shell unit 1, a fixed ratchet wheel 2 arranged in the shell unit 1, a pawl-tube combination unit 3 arranged in the shell unit 1 in a plugging manner and connected with the fixed ratchet wheel 2, a slotted screw unit 4 arranged on the shell unit 1 in a screwing manner and engaged with the pawl-tube combination unit 3 and used for pushing medicines, a movable ratchet wheel unit 5 arranged in the pawl-tube combination unit 3 in a clamping manner and used for rotationally driving the pawl-tube combination unit 3, and a rotary pawl unit 6 arranged in the shell unit 1 and used for driving the movable ratchet wheel unit 5.

In this embodiment, the slotted screw unit 4 is screw-coupled with the housing unit 1 and is engaged with the pawl-tube combination unit 3 at the same time at the beginning of the quantitative injection apparatus, so that the rotation of the pawl-tube combination unit 3 can be converted into the forward movement of the slotted screw unit 4.

Further, the fixed ratchet 2 and the pawl-tube combination unit 3 are one pair of ratchet mechanisms, and the movable ratchet unit 5 and the rotary pawl unit 6 are the other pair of ratchet mechanisms. Between the two pairs of ratchet mechanisms, the movable ratchet unit 5 drives the pawl-tube combination unit 3, so that the rotation of the rotary pawl unit 6, which is the most initial, can be converted into the forward movement of the grooved screw unit 4 step by step.

Furthermore, it is critical for the quantitative injection operation that the rotary pawl unit 6 cannot rotate reversely together with the movable ratchet unit 5 at the time of reverse rotation reset, which is reflected on the grooved screw unit 4, i.e., not retreated.

Of course, it should be noted that a complete product of the dosing device, as well as a suitable "front-end cavity" for filling the cartridge a, is also required, and is connected to the housing unit 1, eventually ensuring that the slotted screw unit 4 can push the cartridge a smoothly. In this case, the "front end cavity" may be a local structure of an existing quantitative injection device.

The housing unit 1 comprises a tube body 101, a head plate 102 arranged on the tube body 101 and provided with the fixed ratchet wheel 2 on the inner side surface, an internal threaded hole 103 arranged on the head plate 102 and used for installing the slotted screw unit 4, and an angle limiting block 104 arranged on the inner annular surface of the tube body 101 and used for blocking and clamping the rotating pawl unit 6.

In the present embodiment, the single rotation angle of the rotary click unit 6 is proportional to the single advance distance of the grooved screw unit 4. Therefore, the effect of the quantitative injection must require the rotation angle limiting function of the rotation pawl unit 6, i.e., a single complete rotation of the rotation pawl unit 6, to be difficult to pass the angle limiting block 104. In other words, this is the setting purpose of the angle stopper 104.

In addition, the inner circumferential surface of the fixed ratchet 2 is aligned with the inner threaded hole 103, so that the inner threads of the inner threaded hole 103 can properly extend into the fixed ratchet 2, thereby ensuring a more stable threaded connection between the housing unit 1 and the grooved screw unit 4.

The housing unit 1 further includes an opening 105 provided on the pipe body 101, and a fall-preventing buckle 106 provided on the opening 105 and adapted to engage the pawl-pipe combination unit 3.

In this embodiment, the pawl-tube combination unit 3 can only rotate and cannot move left and right in the tube body 101, otherwise the slotted screw unit 4 is pushed out and pulled out, so that it is the function of the fall-preventing buckle 106.

Wherein, the general shape of the anti-drop pinch plate 106 is an L shape, and the short side part of the L shape is properly protruded inwards, so that the pawl-tube combination unit 3 is difficult to retract outwards after being installed.

The pawl-tube combination unit 3 includes a middle ring 301 provided on the fall-preventing buckle 106, an arc-shaped pawl 302 provided on the middle ring 301 and connected to the fixed ratchet 2, a rear end tube 303 provided on the middle ring 301 and used for inserting and mounting the movable ratchet unit 5, a driving block 304 provided on an inner circumferential surface of the middle ring 301 and used for engaging the grooved screw unit 4, and a driving groove 305 provided on an inner circumferential surface of the rear end tube 303 and used for engaging the movable ratchet unit 5.

In this embodiment, the arc-shaped pawl 302 and the fixed ratchet 2 constitute a ratchet mechanism common in the prior art, ensuring that the pawl-tube combination unit 3 can only rotate forward, while "forward rotation" means driving the grooved screw unit 4 forward.

Also to be described is: 1. the end point of the insertion and installation action of the middle circular ring 301 is against the fixed ratchet wheel 2; 2. meanwhile, the end point of the insertion and installation action of the arc-shaped pawl 302 is against the end plate 102, so that the front and rear position stability of the rotation action of the pawl-tube combination unit 3 is improved.

In addition, a circle of protrusions are further arranged on the non-installation end face of the fixed ratchet wheel 2, the cross section of each protrusion is arc-shaped, the direct effect of each protrusion is to reduce the contact area between the fixed ratchet wheel 2 and the middle circular ring 301, and the final effect is to reduce the friction resistance of the rotating action of the pawl-tube combination unit 3.

The pawl-tube combination unit 3 further includes a fixing port 306 provided on the rear end tube 303 for inserting the rotary pawl unit 6.

In the present embodiment, the rotary click unit 6 is rotatable only and cannot move left and right, as in the click-tube combination unit 3, and therefore the fixing port 306 is provided, so that the rotary click unit 6 can be indirectly fixed left and right to the tube 101.

The grooved screw unit 4 includes a threaded rod 401 provided on the internally threaded hole 103 and inserted with the pawl-tube combination unit 3 and the movable ratchet unit 5 and the rotary pawl unit 6, and used for pushing the card bottle a, and a lengthwise groove 402 provided on the threaded rod 401, and used for inserting the driving block 304.

In this embodiment, the front end of the threaded rod 401 is further provided with a circular amplification block, and the amplification block is tightly attached to the inner wall of the clip-type bottle a, so as to ensure that the pushing action of the rubber stopper in the clip-type bottle a is more uniform and stable.

The movable ratchet unit 5 includes a support spring 501 provided on the intermediate ring 301 for allowing the rotary pawl unit 6 to idle, a slotted ratchet 502 provided on the support spring 501, and a protruding block 503 provided on the slotted ratchet 502 and engaging the driving groove 305.

In this embodiment, the slotted ratchet 502 has a slotted shape of a right triangle which is commonly used in the prior art, in other words, the pawl of the rotary pawl unit 6 has a right triangle shape, so that the latter can effectively drive the former in one direction.

In addition, the protruding block 503 is always inserted into the driving slot 305, and simultaneously slides relatively on the driving slot 305, when the protruding block 503 slides relatively, the rotating pawl unit 6 rotates reversely, and at this time, the complete one-time quantitative injection operation is completed, and the rotating pawl unit 6 rotates outwards to reset.

Thus, the supporting spring 501 is a key to allow the reverse rotation and return of the rotary pawl unit 6, and at this time, the rotary pawl unit 6 has a certain damping or "feel" when rotated in reverse, and the resistance is derived from compressing the supporting spring 501.

The rotating pawl unit 6 comprises a rotating tube 601 arranged in the tube body 101, a protruding pawl 602 arranged on the end face of the rotating tube 601 and used for being clamped with the slotted ratchet 502, and a fan-shaped protruding block 603 arranged on the outer annular face of the rotating tube 601 and used for being clamped with the angle limiting block 104.

In this embodiment, the protruding pawl 602 is the right triangle block, and the fan-shaped protruding block 603 is rotatably moved back and forth between two adjacent angle limiting blocks 104, and cannot pass over the angle limiting blocks 104.

Specifically, when the fan-shaped protruding block 603 abuts against one of the angle limiting blocks 104 at the rear end of the rotation direction, the protruding pawl 602 is clamped on one of the slots of the slotted ratchet 502, and at this time, the previous injection operation is completed.

Next, the fan-shaped protruding block 603 is rotated from one of the angle limiting blocks 104 at the rear end to one of the angle limiting blocks 104 against the front end, and the protruding pawl 602 rotates with the slotted ratchet 502 for a complete angle of injection operation.

Finally, the fan-shaped protruding block 603 rotates reversely, and returns to the initial state of one of the angle limiting blocks 104 against the rear end, that is, the protruding pawl 602 passes over the upper surface of the slotted ratchet 502 to come to the slotted position of the last slotted ratchet 502.

Thus, a complete metering operation is to drive the protruding pawl 602 back again between two adjacent slots on the slotted ratchet 502.

The rotary pawl unit 6 further includes a connection ring 604 provided on the outer circumferential surface of the rotary pipe 601 for insertion into the fixed port 306.

In this embodiment, the fixing hole 306 includes an inwardly protruding opening edge portion, so that the connection ring 604 is always caught on the fixing hole 306 even when rotated, and the rotary pawl unit 6 is prevented from falling outward.

Of course, the fan-shaped protruding block 603 always presses the end face of the rear end pipe 303, and the rotary click unit 6 is less likely to be displaced inward.

A sliding tube unit 7 for driving the rotary pawl unit 6 is also provided in the tube body 101.

In the present embodiment, the sliding tube unit 7 functions as the most initial action of the injection operation: the rotation of the rotary pawl unit 6 is converted into the inward pushing action of the sliding tube unit 7, which is relatively simpler and more convenient.

The sliding tube unit 7 comprises a circular tube 701 arranged between the tube body 101 and the rotary tube 601, a protruding thread 702 arranged on the inner annular surface of the circular tube 701, and a length direction protruding strip 703 arranged on the outer annular surface of the circular tube 701; the housing unit 1 further comprises a chute 107 arranged on the inner ring surface of the pipe body 101 and used for clamping the lengthwise protruding strip 703; the rotary pawl unit 6 further includes a screw groove 605 provided on the outer circumferential surface of the rotary pipe 601 for coupling with the male screw 702.

In this embodiment, the end point of the inward pushing of the round tube 701 may be that the inner end surface of the sliding groove 107 abuts against the lengthwise protruding strip 703, or that the arc pawl 302 runs through a complete single rotation on the fixed ratchet 2.

The end of the outward withdrawal of the tube 701 is the retraction of the associated male pawl 602 to the next slotted position on the slotted ratchet 502.

In addition, a left-right limiting structure may be additionally provided on the inner ring surface of the tube body 101 to the longitudinal protrusion 703, so as to ensure that the pushing-in and withdrawing-out actions of the circular tube 701 have a definite end position.

The tube body 101 is also sleeved with an outer tube unit 8 for inserting the mounting clip type bottle a and connecting the mounting needle.

In this embodiment, a protruding block for engaging the pen cap 10 is further provided on the outer ring surface of the outer tube unit 8.

The outer tube unit 8 comprises a nib tube 801, a needle mounting tube 802 arranged on the nib tube 801, and a rear opening 803 arranged on the nib tube 801 and used for clamping the tube body 101; the housing unit 1 further comprises a clamping block 108 arranged on the outer ring surface of the pipe body 101 and used for clamping into the rear opening 803.

In this embodiment, the needle mounting tube 802 is an externally threaded tube, and the nib tube 801 is further provided with an opening for observing the liquid level of the cartridge a.

The outer tube unit 8 further comprises a front opening 804 arranged on the nib tube 801, and a clamping unit 9 for clamping the cartridge a is arranged on the front opening 804.

In this embodiment, the front end of the clip bottle a is supported by the needle mounting tube 802, and the rear end is clamped by the fastening unit 9, so that the clip bottle a is fixed, which is also the basis of the accuracy of the quantitative injection operation.

The fastening unit 9 comprises a ring body 901 arranged in the pen point pipe 801, an outer fastener 902 arranged on the ring body 901 and used for being fastened with the front opening 804, and an inner fastener 903 arranged on the ring body 901 and used for clamping the clip-on bottle a.

In this embodiment, the rear opening 803 may serve as a transition position when the snap unit 9 is installed, so that the front opening 804 and the rear opening 803 are aligned circumferentially.

In addition, the outer buckle 902 and the inner buckle 903 are both L-shaped, and the outer buckle 902 is locked into the front opening 804, and the inner buckle 903 is locked into the rear end of the carafe a.

The buckle unit 9 further comprises an arcuate strip 904 provided at both ends on the torus 901 and adapted to receive the compression of the tip plate 102.

In the present embodiment, the first function of the arc-shaped strap 904 is to allow the housing unit 1 to assist in clamping the cartridge a, because it may be difficult to secure a sufficient fixing strength at the outer buckle 902.

The arc-shaped strip 904 protrudes toward the radially outer side of the torus 901; the outer tube unit 8 further includes a mounting and positioning groove 805 provided on the inner circumferential surface of the nib tube 801 for engaging the arc-shaped strip 904.

In this embodiment, after the arc-shaped strip 904 protrudes towards the radial outer side of the torus 901, a second effect is achieved, that is, the arc-shaped strip 904 is clamped and abutted against the installation positioning groove 805 when installed, so that the outer buckle 902 is ensured to be always located on a straight line path defined by the rear opening 803 and the front opening 804, and the problem that the outer buckle 902 cannot be clamped is avoided.

The housing unit 1 further comprises a rectangular opening 109 provided on the end plate 102 for engaging the arcuate strap 904.

In this embodiment, if the rectangular opening 109 is not opened, the end plate 102 can only push against the highest middle point of the arc-shaped strip 904, and the auxiliary clamping force of the housing unit 1 on the arc-shaped strip 904 is preferably to press and deform the arc-shaped strip 904, rather than to drive the whole buckle unit 9, which needs to be avoided.

And after the rectangular opening 109 is introduced, the two end edges of the rectangular opening 109 can directly press the root of the arc-shaped strip 904, so that the auxiliary clamping force of the housing unit 1 presses and fixes the buckling unit 9 as much as possible, and finally further reinforces the clip-on bottle a.

At the same time, this also makes the positioning effect, the circumferential non-staggering feature, between the arcuate strips 904 and the mounting detents 805 more important, otherwise the arcuate strips 904 are difficult to partially snap into the rectangular openings 109.

The embodiments of the present utility model have been described in detail with reference to the drawings, but the present utility model is not limited to the above embodiments, and various modifications may be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model. These are all non-inventive modifications which are intended to be protected by the patent laws within the scope of the appended claims.

Claims

1. Quantitative injection device, its characterized in that: the structure comprises a shell unit (1), a fixed ratchet wheel (2) arranged in the shell unit (1), a pawl-tube combination unit (3) which is inserted and arranged in the shell unit (1) and connected with the fixed ratchet wheel (2), a slotted screw unit (4) which is arranged on the shell unit (1) in a screw joint manner and is clamped with the pawl-tube combination unit (3) and used for pushing medicines, a movable ratchet wheel unit (5) which is arranged in the pawl-tube combination unit (3) in a fastening manner and used for rotationally driving the pawl-tube combination unit (3), and a rotary pawl unit (6) which is arranged in the shell unit (1) and used for driving the movable ratchet wheel unit (5).

2. The quantitative injection device according to claim 1, characterized in that: the shell unit (1) comprises a tube body (101), a head plate (102) which is arranged on the tube body (101) and provided with a fixed ratchet wheel (2) on the inner side surface, an internal threaded hole (103) which is arranged on the head plate (102) and used for installing the slotted screw unit (4), and an angle limiting block (104) which is arranged on the inner annular surface of the tube body (101) and used for blocking and clamping the rotary pawl unit (6).

3. The quantitative injection device according to claim 2, characterized in that: the housing unit (1) further comprises an opening (105) arranged on the pipe body (101), and an anti-falling buckle plate (106) arranged on the opening (105) and used for clamping the pawl-pipe combination unit (3).

4. A dosing injection device according to claim 3, characterized in that: the pawl-tube combination unit (3) comprises a middle circular ring (301) arranged on the anti-falling buckle plate (106), arc pawls (302) arranged on the middle circular ring (301) and connected with the fixed ratchet wheel (2), a rear end tube (303) arranged on the middle circular ring (301) and used for being inserted and installed with the movable ratchet wheel unit (5), a driving block (304) arranged on the inner annular surface of the middle circular ring (301) and used for being clamped with the slotted screw unit (4), and a driving groove (305) arranged on the inner annular surface of the rear end tube (303) and used for being clamped with the movable ratchet wheel unit (5).

5. The quantitative injection device according to claim 4, wherein: the pawl-tube combination unit (3) further comprises a fixing opening (306) provided on the rear end tube (303) for inserting the rotary pawl unit (6).

6. The quantitative injection device according to claim 4, wherein: the slotted screw unit (4) comprises a threaded rod (401) which is arranged on the internal threaded hole (103) and is spliced with the pawl-tube combination unit (3), the movable ratchet wheel unit (5) and the rotary pawl unit (6) and is used for pushing the clamp type bottle (a), and a length direction slot (402) which is arranged on the threaded rod (401) and is used for inserting the driving block (304).

7. The quantitative injection device according to claim 5, wherein: the movable ratchet unit (5) comprises a supporting spring (501) arranged on the middle circular ring (301) and used for allowing the rotary pawl unit (6) to idle, a slotted ratchet wheel (502) arranged on the supporting spring (501), and a protruding block (503) arranged on the slotted ratchet wheel (502) and used for clamping the driving groove (305).

8. The quantitative injection device according to claim 7, wherein: the rotary pawl unit (6) comprises a rotary tube (601) arranged in the tube body (101), a convex pawl (602) arranged on the end face of the rotary tube (601) and used for clamping the slotted ratchet wheel (502), and a fan-shaped convex block (603) arranged on the outer annular surface of the rotary tube (601) and used for clamping the angle limiting block (104).

9. The quantitative injection device according to claim 8, wherein: the rotary pawl unit (6) further comprises a connecting ring (604) arranged on the outer ring surface of the rotary tube (601) and used for being inserted into the fixed port (306).

10. The quantitative injection device according to claim 8, wherein: the tube body (101) is also internally provided with a sliding tube unit (7) for driving the rotary pawl unit (6).

11. The quantitative injection device according to claim 10, characterized in that: the sliding pipe unit (7) comprises a circular pipe (701) arranged between the pipe body (101) and the rotary pipe (601), a protruding thread (702) arranged on the inner annular surface of the circular pipe (701), and a length-direction protruding strip (703) arranged on the outer annular surface of the circular pipe (701);

the shell unit (1) further comprises a chute (107) which is arranged on the inner ring surface of the pipe body (101) and is used for clamping the lengthwise protruding strip (703);

the rotary pawl unit (6) further comprises a thread groove (605) provided on the outer circumferential surface of the rotary pipe (601) and used for connecting the protruding thread (702).

12. The quantitative injection device according to claim 10, characterized in that: the tube body (101) is also sleeved with an outer tube unit (8) for inserting the mounting clip type bottle (a) and connecting the mounting needle.

13. The quantitative injection device according to claim 12, characterized in that: the outer tube unit (8) comprises a nib tube (801), a needle mounting tube (802) arranged on the nib tube (801) and a rear opening (803) arranged on the nib tube (801) and used for clamping the tube body (101);

the housing unit (1) further comprises a clamping block (108) arranged on the outer ring surface of the pipe body (101) and used for being clamped into the rear hole (803).

14. The quantitative injection device according to claim 13, characterized in that: the outer tube unit (8) further comprises a front opening (804) arranged on the pen tip tube (801), and a clamping unit (9) for clamping the clamp type bottle (a) is arranged on the front opening (804).

15. The quantitative injection device according to claim 14, characterized in that: the buckling unit (9) comprises a ring body (901) arranged in the pen point pipe (801), an outer buckle (902) arranged on the ring body (901) and used for being buckled with the front hole (804), and an inner buckle (903) arranged on the ring body (901) and used for clamping the clip-type bottle (a).

16. The quantitative injection device according to claim 15, characterized in that: the buckling unit (9) further comprises an arc-shaped strip (904) with two ends arranged on the annular body (901) and used for receiving the compaction effect of the end plate (102).

17. The quantitative injection device according to claim 16, wherein: the arc-shaped strip (904) protrudes towards the radial outer side of the torus (901);

the outer tube unit (8) further comprises a mounting and positioning groove (805) which is arranged on the inner annular surface of the pen point tube (801) and is used for clamping the arc-shaped strip (904).

18. The quantitative injection device according to claim 16, wherein: the housing unit (1) further comprises a rectangular opening (109) provided on the end plate (102) for engaging the arcuate strip (904).