CN219614580U - Driving device and medicine injection equipment - Google Patents

Abstract

The embodiment of the utility model relates to a driving device, which comprises a base, a screw, a gear, a first pushing module and a second pushing module; the bottom of the spiral tube is fixed on the base through a rotating shaft; the screw rod is in threaded connection with the inner wall of the screw tube; the gear is fixed on the screw tube; the first pushing module comprises a first fixed column, a first sliding block and a first pushing piece; the second pushing module comprises a second fixed column, a second sliding block and a second pushing piece; the drive arrangement that this embodiment provided adopts the screw rod structure, and stability is strong, compact structure is small, portable, can realize the accurate control of drive displacement through gear, screw rod and screwed pipe, realizes promptly that the accurate injection of dosage of dosing.

Description

Driving device and medicine injection equipment

Technical Field

The utility model relates to the field of medical treatment, in particular to a driving device and a drug injection device.

Background

The patch type drug delivery device is a medical instrument device for realizing the treatment of the disease of a patient by injecting drugs into the patient. The device is widely used for treating diabetes, the application type insulin pump system is equipment widely used for infusion of insulin by diabetics, and compared with a traditional insulin pump, the application type insulin pump has no pipeline, can be worn on the body, and can continuously deliver insulin within a certain number of days.

The driving device of the application type drug delivery device is the core of the device and provides driving force for the application type drug delivery device, but the existing driving device is complex in structure, and the whole device is large in size, heavy in weight and high in cost due to the arrangement of a motor.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides the driving device and the drug injection equipment, which adopt the screw structure, have strong stability, compact structure, small volume and convenient carrying, and can realize the accurate control of driving displacement, namely the accurate injection of the drug administration dosage through the gear, the pushing module, the screw and the screw tube.

In view of this, in a first aspect, an embodiment of the present utility model provides a driving apparatus, including:

a base;

the bottom of the screw tube is fixed on the base through a rotating shaft and can rotate around the rotating shaft, and the inner wall of the screw tube is provided with internal threads;

the screw rod is in threaded connection with the inner wall of the screw tube, one end of the screw rod penetrates through the screw tube, and the other end of the screw rod is exposed from the screw tube;

the gear is fixed on the screw tube;

the first pushing module comprises a first fixed column, a first sliding block and a first pushing piece; the first sliding block is provided with a first sliding groove matched with the first fixed column, and the first pushing piece is fixedly connected with the first sliding block and connected with the gear to push the gear to rotate;

the second pushing module comprises a second fixed column, a second sliding block and a second pushing piece; the second sliding block is provided with a second sliding groove matched with the second fixed column, and the second pushing piece is fixedly connected with the second sliding block and connected with the gear to push the gear to rotate.

Preferably, the driving device further includes:

the first driving wire is respectively connected with one end of the first sliding block and one end of the second sliding block, when the first driving wire is contracted, the first sliding block is driven to move and the second sliding block is driven to move, so that a first working position of the first sliding groove is contacted with the first fixed column, a first working position of the second sliding groove is contacted with the second fixed column, and therefore the first driving piece pushes the gear to rotate, the screw is driven to rotate, and meanwhile, the second driving piece passes over the gear;

the second driving silk thread is respectively connected with the other end of the first sliding block and the other end of the second sliding block, when the second driving silk thread contracts, the second sliding block is driven to move and the first sliding block is driven to move, so that a second working position of the second sliding groove is contacted with the second fixed column, a second working position of the first sliding groove is contacted with the first fixed column, and therefore the second pushing piece pushes the gear to rotate, and then the screw is driven to rotate, and meanwhile the first pushing piece passes over the gear.

Further preferably, the first driving wire and the second driving wire are metal wires, when the metal wires are electrified, shrinkage is generated, and therefore the first sliding block and the second sliding block are driven to slide, and the gear is driven to rotate.

Further preferably, the driving device further comprises a first fixed shaft, a second fixed shaft, a third fixed shaft and a fourth fixed shaft, which are all fixed on the base;

the first fixed shaft and the second fixed shaft are respectively arranged at two sides of the first pushing module,

the third fixed shaft and the fourth fixed shaft are respectively arranged at two sides of the second pushing module,

one end of the first driving wire is connected with one end of the first sliding block, and the other end of the first driving wire is connected with one end of the second pushing module in a winding way through the first fixed shaft and the second fixed shaft;

one end of the second driving wire is connected with the other end of the first sliding block, and the other end of the second driving wire is connected with the third fixed shaft and the fourth fixed shaft in a winding manner and is connected with the other end of the second pushing module.

Further preferably, shaft sleeves are arranged on the first fixed shaft, the second fixed shaft, the third fixed shaft and the fourth fixed shaft, and can rotate around the fixed shafts.

Preferably, the driving device further comprises a back plate, a limiting block and a limiting cover;

the backboard is vertically arranged on the base;

one end of the limiting block is fixed on the back plate, and the other end of the limiting block clamps the spiral tube;

the limit cover is clamped on the groove on the outer wall of the screw tube and buckled on the limit block, and the screw tube is fixed between the limit cover and the limit block.

Preferably, the first pushing module further comprises a first fixing pin, one end of the first fixing pin is inserted into and fixed in the first fixing column, and the other end of the first fixing pin is arranged on the first sliding block to axially limit the first sliding block;

the second pushing module further comprises a second fixing pin, one end of the second fixing pin is inserted into and fixed in the second fixing column, the other end of the second fixing pin is arranged on the second sliding block, and the second sliding block is axially limited.

In a second aspect, an embodiment of the present utility model further provides a drug injection device, including the driving apparatus of the first aspect, where the drug injection device further includes:

the pushing plug is fixedly connected with the other end of the screw rod;

the liquid storage tank is sleeved on the plunger to rotate and limit the plunger, and the plunger can axially move in the liquid storage tank to press out liquid medicine in the liquid storage tank.

Preferably, both the plunger and the reservoir are oval.

Preferably, the operation of the drug infusion device comprises:

the first stage, when the first driving silk thread is electrified, the first sliding block is driven to move and the second sliding block is driven to move, so that the first working position of the first sliding groove is contacted with the first fixed column, the first working position of the second sliding groove is contacted with the second fixed column, the first pushing piece pushes the gear to rotate, the screw is driven to rotate, and the screw is axially limited because the screw is axially limited, and the pushing plug and the screw rotate to limit, so that the screw axially moves away from the screw, the pushing plug is pushed to axially move to press out liquid medicine in the liquid storage tank, and meanwhile, the second pushing piece passes over the gear;

the second stage, when the second driving silk thread is electrified, the second sliding block is driven to move and the first sliding block is driven to move, so that the second working position of the second sliding groove is contacted with the second fixed column, the second working position of the first sliding groove is contacted with the first fixed column, the second pushing piece pushes the gear to rotate, and then the screw is driven to rotate, and as the screw is axially limited, the pushing plug and the screw rotate to be limited, the screw axially moves in the direction far away from the screw, so that the pushing plug is pushed to axially move to press out the liquid medicine in the liquid storage tank, and meanwhile, the first pushing piece passes over the gear;

the first stage and the second stage are the same in rotation direction, and the rotation direction is anticlockwise or clockwise.

The driving device and the medicine injection equipment provided by the embodiment of the utility model adopt the screw structure, have strong stability, compact structure and small volume, are convenient to carry, and can realize the accurate control of driving displacement through the gear, the pushing module, the screw and the screw tube, namely realize the accurate injection of the medicine dosage.

Drawings

Fig. 1 is a schematic structural diagram of a driving device according to an embodiment of the present utility model;

FIG. 2 is an exploded view of a driving device according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of an operating state of a driving device according to an embodiment of the present utility model;

fig. 4 is a schematic diagram of another working state of the driving device according to the embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a drug injection device according to an embodiment of the present utility model;

fig. 6 is a schematic view of a screw and plunger combination according to an embodiment of the present utility model.

Detailed Description

The technical scheme of the utility model is further described in detail through the drawings and the embodiments.

Fig. 1 and fig. 2 are a schematic structural diagram and an exploded schematic diagram of a driving device according to an embodiment of the present utility model, and, with reference to fig. 1 and fig. 2, the driving device includes a base 11, a screw 12, a screw 13, a gear 14, a first pushing module 151 and a second pushing module 152, and the structure of each part of the driving device is specifically described below.

A base 11 for fixing the whole driving device.

The screw tube 12, the bottom is fixed on the base 11 through the pivot, specifically, the one end of pivot is fixed on the base 11, and the other end is connected with screw rod 13, and screw tube 12 can revolute the pivot to, and because the other end of pivot is connected with screw rod 13 and is carried out the axial spacing to screw rod 13, make screw rod 13 unable reciprocate, and further, be equipped with the internal thread in screw tube 12 for cooperate with screw rod 13.

The screw 13 is a driving force output end of the driving device, is externally provided with threads and is in threaded connection with the screw 12, one end of the screw penetrates through the screw 12, the other end of the screw is exposed from the screw 12, and the screw 13 can axially screw in or out of the screw 12, so that the axial size of the module can be greatly reduced, the structure is more compact, the space inside the device is released, and convenience is provided for a user.

The gear 14 is perpendicular to the screw 12, is fixed on the screw 12, preferably on the bottom of the screw 12, and the rotation of the gear 14 drives the screw 12 to rotate. In operation of the drive device, the gear 14 preferably rotates in one direction to engage the screw 13 to withdraw from the screw 12.

The first push module 151 may include a first fixed column 1511, a first slider 1512, and a first push plate 1513 in a specific structure. The first fixing column 1511 is fixed on the base 11, the first slider 1512 is provided with a first chute adapted to the first fixing column 1511, the first fixing column 1511 can move relative to the first chute, as shown in fig. 1 to 3, in this example, the leftmost end of the first chute is set as a first working position, and the rightmost end is set as a second working position; the fixed end of the first pushing piece 1513 is fixedly connected with the first slider 1512, and the driving end is connected with the gear 14 to push the gear 14 to rotate. The first pushing module 151 is configured to receive an external driving force, so as to drive the first chute to move until the first fixing post 1511 contacts the first working position or the second working position, thereby pushing the gear 14 to rotate through the first pushing piece 1513.

The second pushing module 152 has the same structure as the first pushing module 151, and may include a second fixing post 1521, a second slider 1522, and a second pushing piece 1523. The second fixed column 1521 is fixed on the base 11, the second sliding block 1522 is provided with a second sliding groove adapted to the second fixed column 1521, and the second fixed column 1521 can move relative to the second sliding groove, in this example, the leftmost end of the second sliding groove is set as a first working position, and the rightmost end is set as a second working position; the fixed end of the second pushing piece 1523 is fixedly connected with the second sliding block 1522, and the driving end is connected with the gear 14 to push the gear 14 to rotate. The second pushing module 152 is configured to receive the external driving force, so as to drive the second chute to move until the second fixing column 1521 contacts the first working position or the second working position, so as to push the gear 14 to rotate through the second pushing piece 1523.

In some preferred embodiments, to ensure stability of the push module during sliding, the first push module further includes a first fixing pin 1514 having one end inserted and fixed in the first fixing post 1511 and the other end disposed on the first slider block to axially limit the first slider block 1512 to prevent the first slider block 1512 from moving up and down during sliding, and likewise, the second push module further includes a second fixing pin 1524 having one end inserted and fixed in the second fixing post 1521 and the other end disposed on the second slider block 1522 to axially limit the second slider block 1522.

The positions of the first pushing module 151, the second pushing module 152 and the gear 14 can be selected and set by a person skilled in the art as required, and in this embodiment, the first pushing module 151 is disposed at the upper left side of the gear 14, and the second pushing module 152 is disposed at the lower right side of the gear 14.

It should be noted that the source of the external driving force may be applied by a user or may be generated by a power module, where the power module includes, but is not limited to, a driving wire, and the application of the driving wire is described below with a specific embodiment.

In a specific example, the power module is two driving wires, preferably a metal wire or a memory alloy wire, that is, the first driving wire 161 and the second driving wire 162, where the first driving wire 161 is connected to one end (right end) of the first slider 1512 and one end (right end) of the second slider 1522, respectively, and when the first driving wire 161 is contracted, the first slider 1512 and the second slider 1522 are driven to move (right), so that the first working position (left end) of the first chute is in contact with the first fixed column 1511, and the first working position (left end) of the second chute is in contact with the second fixed column 1521, thereby driving the gear 14 to rotate through the first pushing piece 1513, and driving the screw 12 to rotate, and meanwhile, the second pushing piece 1523 passes over the gear 14, so as not to push the gear 14.

The second driving wire 162 is connected to the other end (left end) of the first slider 1512 and the other end (left end) of the second slider 1522, respectively, and when the second driving wire 162 is contracted, the second slider 1522 and the first slider 1512 are driven to move (leftwards), so that the second working position (right end) of the second chute contacts the second fixed column 1521, and the second working position (right end) of the first chute contacts the first fixed column 1511, thereby pushing the gear 14 to rotate by the second pushing piece 1523, and further driving the solenoid 12 to rotate, and meanwhile, the first pushing piece 1513 passes over the gear 14, so that no pushing action is generated on the gear 14.

It should be noted that, a person skilled in the art may select the connection position of the driving wire and the slider and the orientation of the working position of the chute according to the need.

In some preferred embodiments, in order to guide the driving wire, as shown in fig. 3 again, the driving apparatus further includes a first fixing shaft 171, a second fixing shaft 172, a third fixing shaft 173, and a fourth fixing shaft 174, all of which are fixed to the base 11, the first fixing shaft 171 and the second fixing shaft 172 are respectively disposed at both sides of the first pushing module 151, the third fixing shaft 173 and the fourth fixing shaft 174 are respectively disposed at both sides of the second pushing module 152, one end of the first driving wire 161 is connected to one end of the first slider 1512, the other end of the first driving wire 161 is connected to one end of the second pushing module 152 by winding, one end of the second driving wire 162 is connected to the other end of the first slider 1512, and the other end of the second driving wire 162 is connected to the other end of the second pushing module 152 by winding, thereby ensuring smooth shrinkage of the driving wire by the four fixing shafts.

Further, the first fixing shaft 171, the second fixing shaft 172, the third fixing shaft 173 and the fourth fixing shaft 174 are respectively provided with a shaft sleeve, namely a first shaft sleeve 1711, a second shaft sleeve 1721, a third shaft sleeve 1731 and a fourth shaft sleeve 1741, which can rotate around the corresponding fixing shafts, and it is understood that when the driving wires shrink, the shaft sleeves are driven to rotate around the fixing shafts, so that friction force is reduced, and energy loss and driving wire loss during driving are reduced.

In order to facilitate the use of the module and the stability of the structure, the driving device further comprises a back plate 18, a limiting block 19 and a limiting cover 191; the back plate 18 is convenient for wearing the module, and the module can be worn by being matched with non-woven fabric adhesive, braces or the like, so that the module is attached to a user, and the back plate 18 is vertical and fixed on the base 11; one end of the limiting block 19 is fixed on the back plate 18, the other end clamps the spiral tube 12, a groove is formed in the outer wall of the spiral tube 12, the limiting cover 191 is clamped on the groove in the outer wall of the spiral tube 12 and buckled on the limiting block 19, the spiral tube 12 is fixed between the limiting cover 191 and the limiting block 19, and it is understood that on one hand, radial runout of the spiral tube 12 is limited through cooperation of the limiting block 19 and the limiting cover 191, and on the other hand, axial displacement of the spiral tube 12 is limited through cooperation of the limiting cover 191 and the groove, so that stability of the spiral tube in the radial direction and the axial direction is guaranteed, and stability of a module in the working process is guaranteed. It should be noted that one end of the limiting block 19 may be fixed to the back plate 18, but not limited to the above.

With the structure of the driving device provided in this embodiment being understood, the working process of the driving device will be specifically described with reference to the above structures of fig. 1 to 4, and it should be noted that, setting fig. 4 to be an initial state and setting the rotation direction of the gear 14 to be clockwise.

When the driving device works, the method specifically comprises two stages:

in the first stage, referring to the variation of fig. 4 to 3, an external driving force is applied to the right sides of the first slider 1512 and the second slider 1522, and the first slider 1512 and the second slider 1522 are driven to move (rightward) by the external driving force, so that the first working position (left end) of the first chute contacts the first fixed column 1511, and the first working position (left end) of the second chute contacts the second fixed column 1521, thereby driving the gear 14 to rotate by the first push plate 1513, and driving the screw 12 to rotate, and the screw 13 to rotate with the screw 12, thereby generating a rotational driving force, and the second push plate 1523 passes over the gear 14, thereby not driving the gear 14.

In the second stage, referring to the variation of fig. 3 to 4, an external driving force is applied to the left sides of the first slider 1512 and the second slider 1522, and the second slider 1522 and the first slider 1512 are driven to move (leftwards) by the external driving force, so that the second working position (right end) of the second chute contacts the second fixed column 1521, and the second working position (right end) of the first chute contacts the first fixed column 1511, thereby pushing the gear 14 to rotate by the second pushing piece 1523, and thus driving the screw 12 to rotate, and the screw 13 rotates with the screw 12, thereby generating a rotational driving force, and the first pushing piece 1513 passes over the gear 14, and does not push the gear 14.

The first stage and the second stage are alternately repeated, whereby the first slider 1512 and the second slider 1522 alternately push the gear 14 to rotate to generate a driving force.

It should be understood that the present module may have various operation modes and processes, including but not limited to the above operation process, and those skilled in the art may set the operation and process of the module according to actual needs, and another operation mode and process of the present driving device will be given below, where when the screw 13 is limited in rotation and cannot rotate, the rotational driving force generated by the driving device is converted into an axial driving force, and in particular, when the gear 14 drives the screw 12 to rotate, since the screw 12 is axially fixed and the screw 13 cannot rotate, the screw 13 performs an axial movement in a direction away from the screw 12, thereby generating an axial driving force, and converting the reciprocating linear movement into a stepping linear movement.

It can be understood that the rotation angle or displacement distance of the final output driving force of the driving device is related to each movement stroke of the pushing piece, the number of teeth of the gear 14, and the thread pitch, for example, the smaller the movement stroke of the pushing piece is, the more the number of teeth of the gear 14 is, the smaller the thread pitch is, the smaller the rotation angle or the smaller the displacement distance is, and the more accurate the movement stroke of the pushing piece, the number of teeth of the gear 14, and the thread pitch are, which can be set by those skilled in the art according to the requirement of the final output driving force. Because displacement of each stage slider is limited through the fixed column, the displacement of each stage is precisely fixed, and therefore the rotation angle or displacement distance of the final output driving force of each stage can be precisely controlled.

Further, the final output driving force displacement direction of the present driving device is related to the mounting position of the module, including but not limited to, up or down, specifically, when the base 11 is mounted down, an upward driving force may be generated, and when the base 11 is mounted up, a downward driving force may be generated.

The driving device provided in this embodiment may be used in combination with other components, so as to be applied to various situations, and the application of the driving device in the medical field of a drug injection device is given below, fig. 5 is a schematic structural diagram of a drug injection device provided in an embodiment of the present utility model, and fig. 6 is a schematic combined diagram of a screw 13 and a plunger provided in an embodiment of the present utility model, where the drug injection device includes the driving device, the plunger 20, and a liquid storage tank 21.

The plunger 20 is fixedly connected with the other end of the screw 13, and the plunger 20 moves along with the screw 13.

The liquid storage tank 21 is used for loading liquid medicine, the liquid storage tank 21 is sleeved on the plunger 20, the plunger 20 is rotationally limited, the plunger 20 can axially move in the liquid storage tank 21 to press out the liquid medicine in the liquid storage tank 21, the liquid storage tank is connected with subcutaneous tissue of a patient through a liquid guide tube, the patient can put the device back on the body, and the plunger 20 is driven to axially move in the liquid storage tank through accurate displacement generated by the screw 13, so that accurate output of the liquid medicine is realized.

The plunger 20 and reservoir herein include, but are not limited to, oval shapes, and may be used to limit the plunger 20 and reservoir from rotation.

It will be appreciated that the operation principle and process of the drug infusion device are similar to those of the driving device described above, and the operation process and principle of the drug infusion device provided in this embodiment will be briefly described with reference to fig. 1 to 6, and the operation process specifically includes the following two stages, and it should be noted that, setting fig. 4 to be an initial state and setting the rotation direction of the gear 14 to be clockwise.

In the first stage, referring to the changing process of fig. 4 to 3, the first driving wire 161 is energized, the first driving wire 161 is contracted, so as to drive the first slide block 1512 to move and the second slide block 1522 to move, so that the first working position of the first sliding groove contacts the first fixed column 1511, and the first working position of the second sliding groove contacts the second fixed column 1521, thereby pushing the gear 14 to rotate through the first pushing piece 1513, so as to drive the screw 12 to rotate, and the screw 13 moves axially in a direction away from the screw 12 due to the axial limit of the screw 12 and the rotation limit of the pushing plug 20 and the screw 13, so as to push the pushing plug 20 to axially move to push out the liquid medicine in the liquid storage tank 21, and meanwhile, the second pushing piece 1523 passes over the gear 14, so that no pushing action is generated on the gear 14.

In the second stage, referring to the changing process of fig. 3 to 4, the second driving wire 162 is energized, the second driving wire 162 is contracted, the second slide block 1522 is driven to move and the first slide block 1512 is driven to move, so that the second working position of the second slide groove contacts the second fixed column 1521, the second working position of the first slide groove contacts the first fixed column 1511, thereby pushing the gear 14 to rotate through the second pushing piece 1523, and further driving the screw 12 to rotate, and because the screw 12 is axially limited, and the pushing plug 20 and the screw 13 rotate to be limited, the screw 13 moves axially away from the screw 12, thereby pushing the pushing plug 20 to axially move to press the liquid medicine in the liquid storage tank 21, and meanwhile the first pushing piece 1513 passes over the gear 14, and does not push the gear 14.

The first and second stage gears 14 rotate in the same direction, which may be counter-clockwise or clockwise.

It can be understood that, the person skilled in the art can calculate and set the motion stroke, the number of teeth of the gear 14, the thread interval and the sectional area of the liquid storage tank 21 of each pushing piece according to the dosage of each pushing piece, so as to realize the accurate output of the liquid medicine. When in use, a user can control the number of stages of the equipment through the required dosage, for example, the output of the liquid medicine corresponding to each stage is 1 microliter, if the dosage is 1 microliter each time, the device works for one stage, and if the dosage is 3 microliters each time, the device works for three stages, so that the accurate control of the dosage is realized.

The application of the driving device can solve the problems that the existing application type drug delivery device is large in size, heavy in weight and inconvenient to carry, and a user cannot accurately control the injection metering of the liquid medicine and the injection dosage is single.

The driving device and the medicine injection equipment provided by the embodiment of the utility model adopt the screw structure, have strong stability, compact structure and small volume, are convenient to carry, and can realize the accurate control of driving displacement through the gear, the pushing module, the screw and the screw tube, namely realize the accurate injection of the medicine dosage.

In the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.

In the description herein, the terms "one particular embodiment," "some embodiments," "one embodiment," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims (10)

1. A driving device, characterized in that the driving device comprises:

a base;

the bottom of the screw tube is fixed on the base through a rotating shaft and can rotate around the rotating shaft, and the inner wall of the screw tube is provided with internal threads;

the screw rod is in threaded connection with the inner wall of the screw tube, one end of the screw rod penetrates through the screw tube, and the other end of the screw rod is exposed from the screw tube;

the gear is fixed on the screw tube;

the first pushing module comprises a first fixed column, a first sliding block and a first pushing piece; the first sliding block is provided with a first sliding groove matched with the first fixed column, and the first pushing piece is fixedly connected with the first sliding block and connected with the gear to push the gear to rotate;

the second pushing module comprises a second fixed column, a second sliding block and a second pushing piece; the second sliding block is provided with a second sliding groove matched with the second fixed column, and the second pushing piece is fixedly connected with the second sliding block and connected with the gear to push the gear to rotate.

2. The drive device according to claim 1, characterized in that the drive device further comprises:

the first driving wire is respectively connected with one end of the first sliding block and one end of the second sliding block, when the first driving wire is contracted, the first sliding block is driven to move and the second sliding block is driven to move, so that a first working position of the first sliding groove is contacted with the first fixed column, a first working position of the second sliding groove is contacted with the second fixed column, and therefore the first driving piece pushes the gear to rotate, the screw is driven to rotate, and meanwhile, the second driving piece passes over the gear;

the second driving silk thread is respectively connected with the other end of the first sliding block and the other end of the second sliding block, when the second driving silk thread contracts, the second sliding block is driven to move and the first sliding block is driven to move, so that a second working position of the second sliding groove is contacted with the second fixed column, a second working position of the first sliding groove is contacted with the first fixed column, and therefore the second pushing piece pushes the gear to rotate, and then the screw is driven to rotate, and meanwhile the first pushing piece passes over the gear.

3. The driving device according to claim 2, wherein the first driving wire and the second driving wire are metal wires, and when the metal wires are electrified, contraction is generated, so that the first sliding block and the second sliding block are driven to slide, and the gear is driven to rotate.

4. The drive of claim 2, further comprising a first fixed shaft, a second fixed shaft, a third fixed shaft, and a fourth fixed shaft, each fixed to the base;

the first fixed shaft and the second fixed shaft are respectively arranged at two sides of the first pushing module,

the third fixed shaft and the fourth fixed shaft are respectively arranged at two sides of the second pushing module,

one end of the first driving wire is connected with one end of the first sliding block, and the other end of the first driving wire is connected with one end of the second pushing module in a winding way through the first fixed shaft and the second fixed shaft;

one end of the second driving wire is connected with the other end of the first sliding block, and the other end of the second driving wire is connected with the third fixed shaft and the fourth fixed shaft in a winding manner and is connected with the other end of the second pushing module.

5. The driving device according to claim 4, wherein the first, second, third and fourth fixed shafts are provided with bushings rotatable about the fixed shafts.

6. The drive of claim 1, further comprising a back plate, a stopper, and a stopper cover;

the backboard is vertically arranged on the base;

one end of the limiting block is fixed on the back plate, and the other end of the limiting block clamps the spiral tube;

the limit cover is clamped on the groove on the outer wall of the screw tube and buckled on the limit block, and the screw tube is fixed between the limit cover and the limit block.

7. The driving device according to claim 1, wherein the first pushing module further comprises a first fixing pin, one end of the first fixing pin is inserted into and fixed in the first fixing column, and the other end of the first fixing pin is arranged on the first sliding block to axially limit the first sliding block;

the second pushing module further comprises a second fixing pin, one end of the second fixing pin is inserted into and fixed in the second fixing column, the other end of the second fixing pin is arranged on the second sliding block, and the second sliding block is axially limited.

8. A drug infusion device comprising the drive device of any of the preceding claims 1-7, characterized in that the drug infusion device further comprises:

the pushing plug is fixedly connected with the other end of the screw rod;

the liquid storage tank is sleeved on the plunger to rotate and limit the plunger, and the plunger can axially move in the liquid storage tank to press out liquid medicine in the liquid storage tank.

9. The drug infusion device of claim 8, wherein the plunger and reservoir are both oval-shaped.

10. The drug infusion device of claim 8, wherein the drug infusion device operation comprises:

the first stage, when the first driving silk thread is electrified, the first sliding block is driven to move and the second sliding block is driven to move, so that the first working position of the first sliding groove is contacted with the first fixed column, the first working position of the second sliding groove is contacted with the second fixed column, the first pushing piece pushes the gear to rotate, the screw is driven to rotate, and the screw is axially limited because the screw is axially limited, and the pushing plug and the screw rotate to limit, so that the screw axially moves away from the screw, the pushing plug is pushed to axially move to press out liquid medicine in the liquid storage tank, and meanwhile, the second pushing piece passes over the gear;

the second stage, when the second driving silk thread is electrified, the second sliding block is driven to move and the first sliding block is driven to move, so that the second working position of the second sliding groove is contacted with the second fixed column, the second working position of the first sliding groove is contacted with the first fixed column, the second pushing piece pushes the gear to rotate, and then the screw is driven to rotate, and as the screw is axially limited, the pushing plug and the screw rotate to be limited, the screw axially moves in the direction far away from the screw, so that the pushing plug is pushed to axially move to press out the liquid medicine in the liquid storage tank, and meanwhile, the first pushing piece passes over the gear;

the first stage and the second stage are the same in rotation direction, and the rotation direction is anticlockwise or clockwise.