CN217593523U - Auxiliary injection device for injector - Google Patents

Abstract

The utility model discloses an auxiliary injection device that syringe was used, a serial communication port, include: the device comprises a shell, a first fixing piece and a second fixing piece, wherein one side of the shell is provided with an opening, and the lower end face of the shell is provided with a lower through hole; the feeding assembly is arranged in the shell and is used for driving the push rod on the needle cylinder to move along the axial direction; the feeding assembly comprises two roller shafts arranged at intervals and a driving motor used for driving at least one of the two roller shafts to rotate around the axis of the feeding assembly, and a clamping space used for clamping the push rod is formed between the two roller shafts, so that the push rod arranged in the clamping space is in transmission connection with the roller shafts; the start-stop switch is arranged outside the shell and electrically connected with the driving motor in the shell and used for controlling the start-stop of the starting motor. The utility model provides an auxiliary injection device for injector, it can accomplish the propelling movement of liquid medicine in the cylinder automatically after the completion injector pierces for medical personnel one-hand operation is convenient.

Description

Auxiliary injection device for injector

Technical Field

The utility model relates to a technical field of syringe appurtenance, specifically the supplementary injection device that a syringe was used.

Background

In the process of injecting medicine into a patient by a medical staff through an injector, the medical staff can select different injection modes, such as intradermal injection, subcutaneous injection or intramuscular injection, and the like, to inject the patient due to different requirements of the medicine and treatment. If intradermal injection and subcutaneous injection are used, a medical worker needs to pull up the skin of a patient with one hand to tighten the skin, and then prick the needle of the syringe held by the other hand; if intramuscular injection is adopted, the skin of the patient needs to be forced to stretch by means of the outward pushing action of two fingers of the medical staff, thereby facilitating the accurate penetration of the muscle layer by the injector held by the other hand; obviously, the above-mentioned injection procedures require the medical staff to perform the puncturing and injection of the syringe with one hand, which obviously causes inconvenience to the medical staff.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem in the correlation technique to a certain extent at least: the auxiliary injection device for the injector can automatically complete the pushing of the liquid medicine in the needle cylinder after the completion of the penetration of the injector, so that the medical care personnel can conveniently operate by one hand.

To this end, an object of the present invention is to provide an auxiliary injection device for a syringe, comprising:

the syringe comprises a shell, a needle cylinder and a needle tube, wherein one side of the shell is provided with an opening, the lower end face of the shell is provided with a lower through hole, and the lower through hole extends to the position where the opening is located and is communicated with the opening so that the lower end of the needle cylinder is exposed below the shell when the upper end of the needle cylinder is placed into the shell through the opening;

the feeding assembly is arranged in the shell and is used for driving the push rod on the needle cylinder to move along the axial direction;

the feeding assembly comprises two roller shafts arranged at intervals and a driving motor for driving at least one of the two roller shafts to rotate around the axis of the feeding assembly, and a clamping space for clamping the push rod is formed between the two roller shafts, so that the push rod and the roller shafts arranged in the clamping space are in transmission connection;

and the start-stop switch is arranged outside the shell and electrically connected with the driving motor in the shell and used for controlling the start-stop of the starting motor. Go into in the casing through the upper end card with syringe cylinder to utilize the subassembly of feeding in the casing to drive push rod axial displacement, consequently medical personnel only need accomplish after the syringe pierces patient's skin, touch and open the automatic injection that stops the switch and can accomplish the interior liquid medicine of syringe, consequently medical personnel one-hand convenient operation.

Preferably, the roll shaft comprises an annular cylinder, a plurality of convex teeth with edges are arranged on the outer side wall of the annular cylinder, all the convex teeth are uniformly distributed along the circumferential direction of the annular cylinder, and the annular cylinder is connected with an output shaft of the driving motor. The convex teeth with the edges can be clamped into the push rod more firmly, so that the roll shaft and the push rod move synchronously, and the slipping condition between the roll shaft and the push rod is reduced.

Preferably, the driving motor comprises a mandrel, a stator sleeved outside the mandrel and a rotor sleeved outside the stator, the mandrel is connected with the shell, the stator is fixedly connected with the mandrel, the rotor is in rotating fit with the stator, and the annular cylinder is sleeved outside the rotor and is fixedly connected with the rotor. The mode that adopts directly to integrate driving motor in the roller not only can provide bigger drive power, can make driving motor size littleer under the condition of satisfying required drive power moreover.

Preferably, a vertical adjusting mechanism for adjusting the positions of the two roll shafts along the vertical direction and a horizontal adjusting mechanism for adjusting the distance between the two roll shafts are arranged in the shell;

the vertical adjusting mechanism comprises a guide rod arranged along the vertical direction, a bearing frame in sliding fit with the guide rod and a thrust spring sleeved outside the guide rod and used for pushing the guide rod to move downwards along the vertical direction;

the horizontal adjusting mechanism comprises two sliding blocks which are arranged on the bearing frame in a sliding mode along the horizontal direction, a screw rod is arranged between the two sliding blocks, two ends of the screw rod are in threaded fit with the two sliding blocks respectively, and the thread directions of the two ends of the screw rod are opposite, so that the two sliding blocks move relatively or move back to back along with the rotation of the screw rod. The width of the clamping space between the two roll shafts can be adjusted through the horizontal adjusting mechanism, so that the push rods with different sizes can be used.

Preferably, an extension cylinder capable of being sleeved outside the needle cylinder is arranged below the shell, the extension cylinder comprises a first half cylinder and a second half cylinder which are spliced along the longitudinal section, the upper end of the first half cylinder is connected with the shell, and the second half cylinder is detachably connected with the first half cylinder; the start-stop switch is arranged on the first half cylinder. Through the design that sets up an extension section of thick bamboo again below the casing, not only can make medical personnel's more convenient gripping.

Preferably, an accommodating cavity is reserved between the inner side wall of the extension cylinder and the outer side wall of the needle cylinder positioned in the extension cylinder and used for accommodating a sheet-shaped storage battery, and the storage battery is connected with the first half cylinder and is electrically connected with a driving motor in the shell. With the battery setting in extending a section of thick bamboo, not only can reduce the occupation to casing 1 inner space to make the smaller and more exquisite that the casing was done, the weight of battery can make holistic focus move down after moving down moreover, thereby lower focus can be more stable when medical personnel grasp.

Preferably, an elastic jacking block is arranged in the extension cylinder, is connected with the inner side wall of the first half cylinder and is used for pushing the needle cylinder to be separated from the first half cylinder when the second half cylinder is opened;

or an elastic ejecting block is arranged in the shell and connected with the inner side wall of the shell and used for pushing the needle cylinder to be separated from the clamping space when the second half cylinder is opened. Through the design of this elasticity kicking block, no matter set up in first half section of thick bamboo or set up in the casing, it can both play and raise the cylinder of syringe when medical personnel open the half section of thick bamboo of second after accomplishing the syringe injection, i.e. break away between the cylinder that makes the syringe and the first half section of thick bamboo to take out the cylinder behind the cylinder of syringe is taken to medical personnel of being convenient for.

Preferably, the upper end surface of the shell is provided with an upper through hole at a position corresponding to the push rod on the needle cylinder, and the upper through hole is used for allowing the end part of the push rod to extend out of the shell.

Preferably, the opening of the shell is covered with a flip, and one side of the flip is hinged with the shell.

Preferably, a display unit is arranged on the outer side surface of the turnover cover, which is away from the shell, and the display unit is electrically connected with the driving motor and is used for displaying the feeding stroke and the feeding speed of the push rod.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

The technical scheme has the following advantages or beneficial effects: firstly, medical personnel only need to incorporate into the opening of the casing with the cylinder upper end of syringe and go into in the centre gripping space through the opening card, can inject the treatment to the patient, only need touch the automatic injection that the start-stop switch can accomplish the liquid medicine after medical personnel holds the syringe and pierces patient's skin this moment, secondly, through the design of an extension section of thick bamboo, make the position of start-stop switch can be close to the middle finger position of medical personnel's hand of holding an extension section of thick bamboo more, then medical personnel can make things convenient for in the control start-stop switch through the pressing of middle finger.

Drawings

Fig. 1 is a schematic diagram of a right front direction three-dimensional structure of an auxiliary injection device for an injector according to the present invention.

Fig. 2 is a schematic view of fig. 1 with both the flip and the second cartridge half open.

Fig. 3 is a schematic view of the syringe of fig. 2 separated from the housing.

Fig. 4 is a partially enlarged view of the region "a" in fig. 3.

Fig. 5 is a perspective view in the upper front direction of fig. 2.

Fig. 6 is a partially enlarged view of the region "B" in fig. 5.

Fig. 7 is a front view schematic of fig. 2.

Fig. 8 is a partially enlarged view of the region "C" in fig. 7.

FIG. 9 is a schematic cross-sectional view taken in the direction "D-D" of FIG. 7.

Fig. 10 is an assembly diagram of the middle roller shaft and the driving motor according to the present invention.

Wherein, 1, a shell; 1.1, opening; 1.2, lower through holes; 1.3, an upper through hole; 2. a roll shaft; 2.1, an annular cylinder; 2.2, convex teeth; 2.2.1, a blade edge; 3. a drive motor; 3.1, a mandrel; 3.2, a stator; 3.3, a mover; 4. a clamping space; 5. a start-stop switch; 6. a vertical adjustment mechanism; 6.1, a guide rod; 6.2, a bearing frame; 7. a horizontal adjustment mechanism; 7.1, a sliding block; 7.2, a screw rod; 8. an extension cylinder; 8.1, a first half cylinder; 8.2, a second half cylinder; 9. a storage battery; 10. an elastic jacking block; 11. a cover is turned; 12. a display unit; 13. a bayonet; 100. a needle cylinder; 101. a push rod; 102. a needle tip.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

An auxiliary injection device for a syringe according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The first embodiment is as follows:

the utility model provides an auxiliary injection device that syringe was used, as shown in the figure, a serial communication port, include:

a housing 1, wherein the housing 1 has an inner cavity therein and can be used for accommodating the upper end of a syringe of a medical needle, one side of the housing 1 has an opening 1.1, and the lower end face of the housing 1 has a lower through hole 1.2, and fig. 7 is a front view of the housing 1, so that the front of the housing 1 has the opening 1.1; the lower through hole 1.2 extends to the position of the opening 1.1 to be communicated with the opening 1.1, so that the upper end of the needle cylinder 100 moves towards the opening 1.1 along the horizontal direction until the needle cylinder 100 is placed into the shell 1 through the opening 1.1, and the needle cylinder 100 can be just clamped into the lower through hole 1.2, and the lower end of the needle cylinder 100 can be exposed below the shell 1 through the lower through hole 1.2; therefore, the size and the weight of the shell 1 can be smaller, and the shell is convenient to use on various existing medical injectors;

the feeding assembly is arranged in the shell 1 and is used for driving the push rod 101 on the needle cylinder 100 to move along the axial direction;

the feeding assembly comprises two roller shafts 2 arranged at intervals and a driving motor 3 used for driving at least one of the two roller shafts 2 to rotate around the axis of the feeding assembly, a clamping space 4 used for clamping the push rod 101 is formed between the two roller shafts 2, and therefore the push rod 101 and the roller shafts 2 arranged in the clamping space 4 are in transmission connection; the roll shafts 2 can be divided into a driving roll and a driven roll, the driving motor 3 only needs to drive the driving roll to rotate at the moment, of course, the roll shafts 2 can also be two driving rolls, the driving motor 3 can provide driving force for the two driving rolls at the moment to drive the two roll shafts 2 to rotate, the two roll shafts 2 clamp the push rod 101 between the two roll shafts, and therefore the two roll shafts 2 can drive the push rod 101 to move downwards along the vertical direction or reset upwards when rotating; it is evident that the directions of rotation of the two rolls 2 are opposite;

and the start-stop switch 5 is arranged outside the shell 1 and is electrically connected with the driving motor 3 in the shell 1, and is used for controlling the start-stop of the starting motor. Make medical personnel can be convenient control driving motor 3 through external opening stop switch 5, should open stop switch 5 and can inherit on the casing lateral wall, can be through the power cord connect the back suspension outside the casing, also can open this through wireless communication connection and stop 5 extra settings at the convenient optional position that touches of medical personnel.

Of course, in order to enable the driving motor 3 to work normally, a power supply needs to be provided for the driving motor 3, and in this embodiment, a battery assembly may be integrated in the housing 1, or a power line may be used to form an electrical connection with an external power supply.

In order to make the push rod on the drive cylinder that roller 2 can be stable can be along the axial piston motion and simple structure, weight is little, is favorable to medical personnel one-hand operation, consequently, the improvement measure of this embodiment lies in: the roll shaft 2 comprises an annular cylinder 2.1, a plurality of convex teeth 2.2 with edges 2.2.1 are arranged on the outer side wall of the annular cylinder 2.1, all the convex teeth 2.2 are uniformly distributed along the circumferential direction of the annular cylinder 2.1, and the annular cylinder 2.1 is connected with an output shaft of the driving motor 3.

The further improvement lies in that: the driving motor 3 is a direct-drive motor arranged in the roller shaft 2, specifically, the driving motor 3 comprises a mandrel 3.1, a stator 3.2 sleeved outside the mandrel 3.1 and a rotor 3.3 sleeved outside the stator 3.2, the mandrel 3.1 is connected with the casing 1, the stator 3.2 is fixedly connected with the mandrel 3.1, the rotor 3.3 is in running fit with the stator 3.2, and the annular cylinder 2.1 is sleeved outside the rotor 3.3 and is fixedly connected with the rotor 3.3. This driving motor 3 adopts the design of integration in roller 2, not only can make driving motor 3 provide bigger drive power, has reduced middle drive disk assembly moreover for whole weight is lighter.

Because of the size differences of different injectors, i.e. the diameters of the syringe and the push rod have various sizes, in order to improve the universality of the embodiment, the improvement of the embodiment is as follows: a vertical adjusting mechanism 6 for adjusting the positions of the two roll shafts 2 along the vertical direction and a horizontal adjusting mechanism 7 for adjusting the distance between the two roll shafts 2 are arranged in the shell 1;

the vertical adjusting mechanism 6 comprises a guide rod 6.1 arranged along the vertical direction, a bearing frame 6.2 in sliding fit with the guide rod 6.1, and a thrust spring (not shown in the figure) sleeved outside the guide rod 6.1 and used for pushing the guide rod 6.1 to move downwards along the vertical direction, wherein one end of the thrust spring abuts against the inner side wall of the shell 1, and the other end of the thrust spring abuts against the bearing frame 6.2, so that the bearing frame 6.2 is pushed to have a downward movement trend along the vertical direction;

the horizontal adjusting mechanism 7 comprises two sliding blocks 7.1 which are arranged on the bearing frame 6.2 in a sliding mode along the horizontal direction, a screw 7.2 is arranged between the two sliding blocks 7.1, two ends of the screw 7.2 are in threaded fit with the two sliding blocks 7.1 respectively, and the thread directions of the two ends of the screw 7.2 are opposite, so that the two sliding blocks 7.1 move relatively or back to back along with the rotation of the screw 7.2.

As an improvement, the thrust spring in the vertical adjustment mechanism 6 can be replaced by a linear motor, namely the linear motor is in sliding fit on the guide rod 6.1, and the bearing frame 6.2 is connected with the linear motor, so that the improvement is that the bearing frame 6.3 can freely move on the guide rod 6.1 and can stay at any position of any guide rod 6.1; but the shortcoming lies in that the linear electric motor who adds will lead to weight gain to make the whole weight gain of this embodiment, be unfavorable for the light operation of medical personnel one hand.

As an improvement, an extension cylinder 8 capable of being sleeved outside the needle cylinder 100 is arranged below the housing 1, the extension cylinder 8 is of a cylindrical structure, the extension cylinder 8 comprises a first half cylinder 8.1 and a second half cylinder 8.2 which are spliced along a longitudinal section, namely, the longitudinal section of the extension cylinder 8 along the central axis of the extension cylinder is divided into the first half cylinder 8.1 and the second half cylinder 8.2, and the first half cylinder 8.1 and the second half cylinder 8.2 are spliced with each other to form a finished cylindrical structure, wherein the upper end of the first half cylinder 8.1 is connected with the housing 1, and the second half cylinder 8.2 is detachably connected with the first half cylinder 8.1; and the start-stop switch 5 is arranged on the first half-cylinder 8.1.

Preferably, the upper end of the first half-cylinder 8.1 and the housing 1 are preferably of an integral structure, but the detachable connection between the upper end of the first half-cylinder 8.1 and the housing 1 is not excluded.

Preferably, as shown, the second half-cylinder 8.2 and the first half-cylinder 8.1 are hinged by means of hinges.

Preferably, for the convenience of single-handed control of the medical staff, the position of the start-stop switch 5 should be a position which can be conveniently touched by the middle finger of the hand of the medical staff gripping the extension barrel 8.

In order to enable the medical staff to be more stable in operation, therefore, the improvement measures of the embodiment are as follows: by lowering the overall center of gravity of the present embodiment, i.e. by leaving a receiving chamber between the inner sidewall of the extension cylinder 8 and the outer sidewall of the needle cylinder 100 located inside the extension cylinder 8, the storage battery 9 is used for receiving the sheet-like storage battery 9, and the storage battery 9 is connected with the first half cylinder 8.1 and is electrically connected with the driving motor 3 inside the housing 1. The space in the extension cylinder 8 can be utilized to place the storage battery 9, so that the space occupied in the shell 1 is reduced, and meanwhile, the storage battery 9 is installed in the extension cylinder 8, so that the overall gravity center of the embodiment can be lowered, and the medical staff can grasp the extension cylinder 8 more stably when holding the extension cylinder 8 with one hand.

Of course, the housing 1 or the extension cylinder 8 should be provided with a charging interface for charging the storage battery 9, so that the storage battery can be conveniently plugged with an external charging wire.

In order to facilitate the medical staff to conveniently take out the old syringe after completing the injection of the previous syringe, the improvement of the embodiment lies in that: an elastic top block 10 is arranged in the extension cylinder 8, and the elastic top block 10 is made of elastic materials, such as sponge, rubber, metal elastic sheets and the like; the elastic top block 10 is connected with the inner side wall of the first half cylinder 8.1 and is used for pushing the needle cylinder 100 to be separated from the first half cylinder 8.1 when the second half cylinder 8.2 is opened;

or an elastic top block 10 is arranged in the shell 1, and the elastic top block 10 is connected with the inner side wall of the shell 1 and is used for pushing the needle cylinder 100 to be pulled out of the clamping space 4 when the second half cylinder 8.2 is opened.

Further, when the medical staff takes the old syringe through the elastic top block 100 after completing the injection of the syringe, the needle point 102 on the syringe still needs to be manually taken down and put into the medical sharps box, in order to reduce the extra work of the medical staff to disassemble the needle point 102 on the old syringe, the improvement of the embodiment lies in: a bayonet 13 is provided at the lower end of the extension barrel 8 facing away from the housing 1, and the bayonet 13 corresponds to the plastic interface position at the upper end of the needle tip 102, that is, the bayonet 13 is clamped in the gap between the upper end surface of the needle tip 102 and the extension barrel 8, so that the bayonet 13 can abut against the needle tip 102 after the extension barrel 8 is taken out with the housing 1, thereby disengaging the needle tip 102 from the extension barrel 8 and dropping into the sharps box. The specific operation is that after the medical staff completes the injection, the first half barrel 8.1 of the extension barrel 8 is opened, at this time, the elastic jacking block 10 jacks up the needle cylinder 100 part of the injector, then the medical staff aligns the needle point 102 on the needle cylinder 100 with the opening of the sharps box, and then takes out the needle cylinder 100 upwards along the approximately vertical direction, at this time, the plastic interface of the needle point 102 abuts against the bayonet 13, so that the needle point 102 is separated and falls into the sharps box under the action of the self gravity while taking out the needle cylinder 100.

Of course, the bayonet 13 is formed by two half notches respectively arranged on the first half cylinder 8.1 and the second half cylinder 8.2.

Preferably, the upper end surface of the housing 1 is provided with an upper through hole 1.3 at a position corresponding to the push rod 101 on the syringe 100, for allowing the end of the push rod 101 to extend out of the housing 1.

The opening 1.1 of the shell 1 is covered with a turnover cover 11, and one side of the turnover cover 11 is hinged with the shell 1; the other side of the flip cover 11 and the shell can be mutually attracted or pushed away through a magnetic part, and can also realize alternative pressing locking and pressing unlocking through a touch switch.

Preferably, the outer side surface of the flip 11 facing away from the housing 1 is provided with a display unit 12, the display unit 12 may adopt various display screens sold in the market, a circuit board of the display screen is electrically connected with the driving motor 3, or the circuit board of the display screen is electrically connected with the driving motor 3 through a controller, and is used for displaying the feeding stroke and the feeding speed of the push rod 101. Certainly, the driving motor 3 can make the display unit implement the display towards the display unit 12 unidirectional transmission signal, based on the improvement of prior art, also can be through display unit 12 to driving motor 3 input control signal, and what be integrated on the display unit 12 is the touch screen promptly, can open from this and stop the rotational speed of motor and control by people. Displaying the motion parameters of the motor in real time through the display unit and inputting the control command to the driving motor 3 through the touch screen on the display unit are very conventional prior art in the existing communication field, so the structure of the display unit 12 is not described in detail here.

In the embodiment in which the controller for controlling the driving motor 3 is provided in the housing 1, in order to prevent the medicine for non-intravenous injection from being erroneously injected into the vein when subcutaneous, intradermal, or intramuscular injection is performed, it is necessary to withdraw the syringe before subcutaneous, intradermal, or intramuscular injection, and to determine that there is no blood return from the syringe before performing subcutaneous, intradermal, or intramuscular injection again, in accordance with the requirement of the medical injection protocol. Therefore, the improvement of the present embodiment can be improved from the program control, specifically: medical personnel pierce the needle point of syringe to patient's injection site after press and open stop switch 5, open stop switch 5 with this signal transmission to controller, this signal of controller definition is first signal, controller control driving motor 3 reversal this moment, the push rod that drives the syringe from this moves towards the direction that deviates from the cylinder, realizes pumpback, and medical personnel can judge whether the syringe pierces the vein through observing whether syringe or needle point have blood backward flow this moment. If no blood returns, the medical staff presses the start-stop switch 5 again, the controller receives the signal of the start-stop switch 5 for the second time, the controller defines the signal as a secondary signal, and if the time interval between the primary signal and the secondary signal is smaller than a set value, the controller judges that the secondary signal is an injection starting signal, and the controller controls the driving motor 3 to rotate forwards to complete injection. If blood returns, the medical staff needs to pull out the injector for re-injection, and at the moment, the controller resets and eliminates the primary signal when the secondary signal is not received after the primary signal is received for more than the set time.

Preferably, the controller may be integrated with the display unit 12, or a controller for controlling the driving motor 3 may be additionally provided in the housing 1.

Preferably, in order to enable medical staff to observe whether blood returns on the needle cylinder and the needle point of the syringe during the withdrawal process, the extension cylinder 8 should be provided with an observation window to facilitate visual observation of the needle cylinder. The viewing window may extend axially to the needle tip position.

In order to meet the requirement of non-whole injector injection, namely 0.5 heparin injection, the improvement of the embodiment is as follows: the controller can realize the action of driving the motor to rotate for half stroke after outputting a control instruction according to medical personnel. Namely, on the basis of the moving distance of the full stroke of the push rod driven by the driving motor, the controller inputs a half-stroke instruction according to the display unit 12 with the touch key, and the controller controls the driving motor 3 to feed the half stroke after being drawn back.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. It is therefore intended that the appended claims be interpreted as covering all alterations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.

Claims (10)

1. An auxiliary injection device for a syringe, comprising:

the syringe comprises a shell (1), wherein one side of the shell (1) is provided with an opening (1.1), the lower end face of the shell is provided with a lower through hole (1.2), and the lower through hole (1.2) extends to the position of the opening (1.1) to be communicated with the opening (1.1) so that the lower end of a syringe (100) is exposed below the shell (1) when the upper end of the syringe (100) is placed into the shell (1) through the opening (1.1);

the feeding assembly is arranged in the shell (1) and is used for driving the push rod (101) on the needle cylinder (100) to move along the axial direction;

the feeding assembly comprises two roller shafts (2) arranged at intervals and a driving motor (3) used for driving at least one of the two roller shafts (2) to rotate around the axis of the roller shaft, a clamping space (4) used for clamping a push rod (101) is formed between the two roller shafts (2), and the push rod (101) arranged in the clamping space (4) is in transmission connection with the roller shafts (2);

the start-stop switch (5) is arranged outside the shell (1) and is electrically connected with the driving motor (3) in the shell (1) and used for controlling the start of the starting motor to be started and stopped.

2. An auxiliary injection device for a syringe as defined in claim 1, wherein: the roll shaft (2) comprises an annular cylinder (2.1), a plurality of convex teeth (2.2) with edges (2.2.1) are arranged on the outer side wall of the annular cylinder (2.1), all the convex teeth (2.2) are uniformly distributed along the circumferential direction of the annular cylinder (2.1), and the annular cylinder (2.1) is connected with an output shaft of the driving motor (3).

3. An auxiliary injection device for a syringe as defined in claim 2, wherein: the driving motor (3) comprises a mandrel (3.1), a stator (3.2) sleeved outside the mandrel (3.1) and a rotor (3.3) sleeved outside the stator (3.2), the mandrel (3.1) is connected with the shell (1), the stator (3.2) is fixedly connected with the mandrel (3.1), the rotor (3.3) is in running fit with the stator (3.2), and the annular cylinder (2.1) is sleeved outside the rotor (3.3) and is fixedly connected with the rotor (3.3).

4. An auxiliary injection device for a syringe as defined in claim 1, wherein: a vertical adjusting mechanism (6) for adjusting the positions of the two roll shafts (2) along the vertical direction and a horizontal adjusting mechanism (7) for adjusting the distance between the two roll shafts (2) are arranged in the shell (1);

the vertical adjusting mechanism (6) comprises a guide rod (6.1) arranged along the vertical direction, a bearing frame (6.2) in sliding fit with the guide rod (6.1), and a thrust spring sleeved outside the guide rod (6.1) and used for pushing the guide rod (6.1) to move downwards along the vertical direction;

the horizontal adjusting mechanism (7) comprises two sliding blocks (7.1) which are arranged on the bearing frame (6.2) along the horizontal direction in a sliding mode, a screw rod (7.2) is arranged between the two sliding blocks (7.1), two ends of the screw rod (7.2) are in threaded fit with the two sliding blocks (7.1) respectively, and the thread directions of the two ends of the screw rod (7.2) are opposite, so that the two sliding blocks (7.1) move relatively or move back to back along with the rotation of the screw rod (7.2).

5. An auxiliary injection device for a syringe as defined in claim 1, wherein: an extension cylinder (8) which can be sleeved outside the needle cylinder (100) is arranged below the shell (1), the extension cylinder (8) comprises a first half cylinder (8.1) and a second half cylinder (8.2) which are spliced along the longitudinal section, the upper end of the first half cylinder (8.1) is connected with the shell (1), and the second half cylinder (8.2) is detachably connected with the first half cylinder (8.1);

the start-stop switch (5) is arranged on the first half cylinder (8.1).

6. An auxiliary injection device for a syringe as defined in claim 5, wherein: an accommodating cavity is reserved between the inner side wall of the extension cylinder (8) and the outer side wall of the needle cylinder (100) positioned in the extension cylinder (8) and used for accommodating a sheet-shaped storage battery (9), and the storage battery (9) is connected with the first half cylinder (8.1) and is electrically connected with the driving motor (3) in the shell (1).

7. An auxiliary injection device for a syringe as defined in claim 5, wherein: an elastic ejector block (10) is arranged in the extension cylinder (8), and the elastic ejector block (10) is connected with the inner side wall of the first half cylinder (8.1) and used for pushing the needle cylinder (100) to be separated from the first half cylinder (8.1) when the second half cylinder (8.2) is opened;

or an elastic ejector block (10) is arranged in the shell (1), and the elastic ejector block (10) is connected with the inner side wall of the shell (1) and used for pushing the needle cylinder (100) to be disengaged from the clamping space (4) when the second half cylinder (8.2) is opened.

8. An auxiliary injection device for a syringe as defined in claim 1, wherein: an upper through hole (1.3) is reserved at the position, corresponding to the push rod (101), on the needle cylinder (100) on the upper end surface of the shell (1) and used for enabling the end part of the push rod (101) to extend out of the shell (1).

9. An auxiliary injection device for a syringe as defined in claim 1, wherein: the opening (1.1) of casing (1) coats and is stamped flip (11), one side and casing (1) of flip (11) are articulated.

10. An auxiliary injection device for a syringe as defined in claim 9, wherein: the outer side face, deviating from the shell (1), of the turnover cover (11) is provided with a display unit (12), and the display unit (12) is electrically connected with the driving motor (3) and used for displaying the feeding stroke and the feeding speed of the push rod (101).

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