CN220967824U

CN220967824U - Liquid medicine injection device

Info

Publication number: CN220967824U
Application number: CN202322116225.0U
Authority: CN
Inventors: 李东成; 朱慧忠; 张舒
Original assignee: Union Medical Shenzhen Co ltd
Current assignee: Union Medical Shenzhen Co ltd
Priority date: 2023-08-07
Filing date: 2023-08-07
Publication date: 2024-05-17
Anticipated expiration: 2033-08-07

Abstract

The utility model discloses a liquid medicine injection device, comprising: a needle cylinder adapter; the needle cylinder is arranged on the needle cylinder adapter seat and comprises a cylinder shell and a piston positioned in the cylinder shell, and one end of the cylinder shell is provided with an opening and is in butt joint with the needle cylinder adapter seat; the push rod mechanism is arranged in the needle cylinder adapter seat, the push rod mechanism comprises a push rod which is arranged on the needle cylinder adapter seat in a lifting manner and a rotary drum which is sleeved outside the push rod, the rotary drum can move along with the push rod and can rotate along the axis direction of the rotary drum, one end of the push rod, which is used for connecting a piston, is provided with a lock head, the piston is provided with a clamping seat, the lock head comprises a plurality of lock tongues, the lock tongues are clamped and matched with the clamping seat through the plurality of lock tongues, and the plurality of lock tongues are in transmission connection with the rotary drum; the first driving mechanism is arranged in the needle cylinder adapter seat and is used for driving the rotary drum to rotate so as to drive the lock tongue to extend out of or retract into the lock head from the lock head. According to the liquid medicine injection device, the push rod is in butt joint or separation with the piston through the driving of the first driving mechanism, so that the injection device is disassembled and assembled, and the efficiency is improved.

Description

Liquid medicine injection device

Technical Field

The utility model relates to the technical field of injection devices, in particular to a liquid medicine injection device.

Background

In medical treatment, it is quite common to access intravenous injection of a specific medical fluid to treat or assist diagnosis of a disease. The process is realized by using a specific injection device, an infusion tube, a vein puncture needle and other instruments, wherein the most widely used injection device is an injection device for injecting the liquid medicine in the injector into a vein through the infusion tube by means of a certain extrusion or pushing force.

At present, when dismouting injection device, medical personnel need manual with push rod and piston butt joint or separation, however, medical personnel still need accomplish other detection work, manual dismouting injection device, the troublesome operation has not only increased medical personnel's working strength, and efficiency is lower moreover.

Disclosure of utility model

The utility model mainly aims to provide a liquid medicine injection device, and aims to solve the technical problems that the existing manual disassembly and assembly injection device is troublesome to operate and low in efficiency.

In order to achieve the above object, the present utility model provides a medical fluid injection apparatus comprising:

a needle cylinder adapter;

The needle cylinder is mounted on the needle cylinder adapter seat and comprises a cylinder shell and a piston positioned in the cylinder shell, and one end of the cylinder shell is provided with an opening and is in butt joint with the needle cylinder adapter seat;

The push rod mechanism is arranged in the needle cylinder adapter seat and comprises a push rod which is arranged on the needle cylinder adapter seat in a lifting manner and a rotary drum which is sleeved outside the push rod, the rotary drum can move along with the push rod and can rotate along the axis direction of the rotary drum, one end of the push rod, which is used for being connected with a piston, is provided with a lock head, the piston is provided with a clamping seat, the lock head comprises a plurality of lock tongues, and the lock tongues are in clamping fit with the clamping seat through a plurality of lock tongues, and a plurality of lock tongues are in transmission connection with the rotary drum;

the first driving mechanism is arranged in the needle cylinder adapter seat and is used for driving the rotary cylinder to rotate so as to drive the lock tongue to extend out of or retract into the lock head from the lock head.

In some embodiments, the lock head includes a base and a cam disposed on the base, and the plurality of lock bolts are disposed on the base and located in a circumferential direction of the cam, and the plurality of lock bolts can rotate with the cam to extend and retract along a radial direction of the cam.

In some embodiments, the base is provided with a plurality of sliding grooves arranged along the circumferential direction of the base, and each lock tongue is correspondingly and slidably arranged in one sliding groove;

The lock tongue is provided with a transmission part, the cam is provided with a plurality of arc grooves which are circumferentially arranged along the cam, and the transmission part on each lock tongue is correspondingly inserted into one arc groove.

In some embodiments, a deflector rod is connected to the bottom of the cam, at least one end of the deflector rod penetrates out of the push rod and is inserted into the rotary drum, and the deflector rod can rotate along with the rotary drum to drive the cam to rotate.

In some embodiments, the first drive mechanism comprises:

the first driving piece is arranged on the needle cylinder adapter seat;

The rotary cylinder is arranged on the needle cylinder adapter seat in a rotatable manner, the rotary cylinder is sleeved on the rotary cylinder adapter seat, the output execution end of the first driving piece is connected with the rotary cylinder seat through a first transmission assembly, and the rotary cylinder can move along with the push rod relative to the rotary cylinder seat and can rotate along with the rotary cylinder seat.

In some embodiments, the first transmission assembly includes:

The first gear is arranged at the output execution end of the first driving piece, and the second gear is connected with the rotary drum through the rotating seat.

In some embodiments, further comprising:

the second driving mechanism is arranged on the needle cylinder adapter seat and is used for driving the push rod to lift.

In some embodiments, the second drive mechanism comprises:

the screw rod assembly comprises a screw rod and a nut seat in threaded fit with the screw rod, and the push rod is sleeved on the screw rod and connected with the nut seat;

The output execution end of the second driving piece is connected with one end of the screw rod through a second transmission assembly and used for driving the screw rod to rotate.

In some embodiments, the second drive assembly includes a timing belt and two timing wheels;

One of the two synchronizing wheels is connected with the output execution end of the second driving piece, the other of the two synchronizing wheels is connected with one end of the screw rod, and the synchronous belt is sleeved on the two synchronizing wheels.

In some embodiments, further comprising an infusion bottle and infusion tube assembly;

The infusion tube assembly comprises a three-way check valve, a first infusion tube, a second infusion tube and a third infusion tube, wherein the first infusion tube, the second infusion tube and the third infusion tube are respectively connected with the three-way check valve, the first infusion tube is connected with the infusion bottle and the three-way check valve, the second infusion tube is connected with the three-way check valve and the needle cylinder, one end of the third infusion tube is communicated with the three-way check valve, and the other end of the third infusion tube is used for outputting liquid medicine.

According to the liquid medicine injection device, the needle cylinder is abutted on the needle cylinder adapter seat, and the push rod is driven to be locked with the piston in the needle cylinder through the first driving mechanism in the needle cylinder adapter seat, wherein the first driving mechanism drives the rotary cylinder to rotate, and the rotary cylinder drives the plurality of lock bolts to extend out of or retract into the lock head from the lock head so as to lock or unlock the push rod and the piston. When the injection device is installed, the first driving mechanism drives the rotary drum to rotate forward so that the plurality of lock bolts retract into the lock head, and when the piston of the needle cylinder reaches the clamping position, the first driving mechanism drives the rotary drum to rotate reversely so that the plurality of lock bolts extend out of the lock head and are clamped and matched with the clamping seat of the piston, so that the push rod and the piston are locked; when the injection device is disassembled, the rotary drum is driven to rotate forwards through the first driving mechanism, so that the plurality of lock bolts retract into the lock head and are not clamped and matched with the clamping seat of the piston, and the locking of the push rod and the piston is cancelled, so that the injection device is disassembled. According to the liquid medicine injection device, the rotary drum is driven by the first driving mechanism, so that the push rod and the piston can be in butt joint or separation, the injection device is disassembled and assembled conveniently and stably, the working strength of medical staff is reduced, and the efficiency is improved.

Drawings

FIG. 1 is a schematic view showing a semi-sectional structure of a medical fluid injection apparatus according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a syringe adapter according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a lock cylinder according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a locking mode of a cam according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram illustrating an unlock mode of a cam according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a first driving mechanism according to an embodiment of the present utility model;

FIG. 7 is a schematic top view of a syringe adapter according to an embodiment of the present utility model;

fig. 8 is a schematic structural view of a medical fluid injection apparatus according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made more clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The present utility model proposes a medical fluid injection apparatus, referring to fig. 1 and 2, comprising:

A syringe adapter 100;

The syringe 200 is mounted on the syringe adapter 100, the syringe 200 comprises a syringe housing 210 and a piston 220 positioned in the syringe housing 210, and one end of the syringe housing 210 is provided with an opening and is in butt joint with the syringe adapter 100;

The push rod mechanism 300 is arranged in the needle cylinder adapter 100, the push rod mechanism 300 comprises a push rod 310 which is arranged on the needle cylinder adapter 100 in a lifting manner and a rotary drum 320 which is sleeved outside the push rod 310, the rotary drum 320 can move along with the push rod 310 and can rotate along the axis direction of the rotary drum, a lock head 311 is arranged at one end of the push rod 310, which is used for connecting the piston 220, the piston 220 is provided with a clamping seat 221, the lock head 311 comprises a plurality of lock tongues 3111, and the lock tongues 3111 are in clamping fit with the clamping seat 221 through the lock tongues 3111, and are in transmission connection with the rotary drum 320;

The first driving mechanism 400 is disposed in the cylinder adapter 100, and the first driving mechanism 400 is used for driving the drum 320 to rotate so as to drive the lock tongue 3111 to extend from the lock 311 or retract into the lock 311.

In this embodiment, the cylinder housing 210 of the syringe 200 is in a straight cylinder shape, the upper end of the syringe 200 is used for installing a needle, the lower end is provided with an opening for the push rod 310 to enter, the piston 220 is located in the cylinder housing 210 and is in interference fit with the cylinder housing 210, the upper end of the piston 220 is in a funnel shape, the lower end is provided with a clamping space, and the left side of a clamp arranged on the piston 220 is located on the inner wall surface of the clamping space. The push rod mechanism 300 comprises a push rod 310, a rotary cylinder 320 and a locking head 311, wherein the locking head 311 is used for being in clamping fit with the piston 220, and the rotary cylinder 320 is sleeved on the push rod 310. Specifically, a cavity is disposed at the upper portion of the push rod 310, the locking head 311 is located in the cavity, the cylinder housing 210 and the cylinder adapter 100 form a circumferential fixed fit, and the rotation of the first driving mechanism 400 about the axis of the cylinder 320 drives the plurality of lock bolts 3111 to move horizontally inwards or outwards, so as to lock and unlock the push rod 310 and the piston 220. Wherein, a control circuit is arranged in the liquid medicine injection device, a touch screen or an operation key is arranged on the needle cylinder adapter seat 100, and the control circuit is respectively and electrically connected with the first driving mechanism 400, the touch screen and the operation key, so that medical staff can control the operation of the first driving mechanism through the touch screen or the key to unlock and lock the liquid medicine injection device. Further, a wireless communication module electrically connected with the control circuit can be arranged in the liquid medicine injection device, so that medical staff can conveniently and wirelessly connect with the liquid medicine injection device through a mobile terminal (such as a mobile phone and a tablet personal computer) to realize the control of the liquid medicine injection device.

According to the liquid medicine injection device, the syringe 200 is abutted on the syringe adapter 100, and the first driving mechanism 400 in the syringe adapter 100 drives the push rod 310 to be locked with the piston 220 in the syringe 200, wherein the first driving mechanism 400 drives the rotary drum 320 to rotate, and the rotary drum 320 drives the plurality of lock bolts 3111 to extend from the lock heads 311 or retract into the lock heads 311, so that the push rod 310 and the piston 220 are locked or unlocked. When the injection device is installed, the first driving mechanism 400 drives the rotary drum 320 to rotate forward so that the plurality of lock tongues 3111 retract into the lock head 311, and when the piston 220 of the syringe 200 reaches the clamping position, the first driving mechanism 400 drives the rotary drum 320 to rotate reversely so that the plurality of lock tongues 3111 extend out of the lock head 311 and are clamped and matched with the clamping seat 221 of the piston 220, so that the push rod 310 and the piston 220 are locked; when the injection device is disassembled, the first driving mechanism 400 drives the rotary cylinder 320 to rotate forwards, so that the lock bolts 3111 are retracted into the lock heads 311 and are not clamped and matched with the clamping seat 221 of the piston 220, and the locking of the push rod 310 and the piston 220 is cancelled, so that the injection device is disassembled. According to the liquid medicine injection device, the rotary drum 320 is driven by the first driving mechanism 400, so that the push rod 310 and the piston 220 can be in butt joint or separation, the disassembly and assembly of the injection device are realized, the disassembly and assembly are convenient, the clamping is stable, the working intensity of medical staff is reduced, and the efficiency is improved.

In some embodiments, referring to fig. 2 and 3, the locking head 311 further includes a base 3112 and a cam 3113 disposed on the base 3112, and a plurality of locking tongues 3111 are disposed on the base 3112 and circumferentially on the cam 3113, the plurality of locking tongues 3111 being rotatable with the cam 3113 to extend and retract in a radial direction of the cam 3113.

In this embodiment, a plurality of lock bolts 3111 are uniformly arranged at intervals along the circumferential direction of the lock head 311, the lock bolts 3111 abut against the clamping seat 221 when extending out, locking with the clamping seat 221 is achieved, the drum 320 drives the cam 3113 to control the lock bolts 3111 to pop up or retract in time, and matching locking or unlocking of the lock head 311 and the piston 220 is achieved.

In some embodiments, referring to fig. 4 and 5, the base 3112 is provided with a plurality of sliding grooves 3112a circumferentially arranged thereon, and each lock tongue 3111 is correspondingly slidably disposed in one sliding groove 3112 a;

The bolt 3111 is provided with a transmission part 3111a, the cam 3113 is provided with a plurality of arc-shaped grooves 3113a arranged along the circumferential direction, and the transmission part 3111a on each bolt 3111 is correspondingly inserted into one arc-shaped groove 3113 a.

In this embodiment, the transmission portion 3111a disposed at one end of the lock tongue 3111 can move along the slot wall of the arc slot 3113a, the other end of the lock tongue 3111 moves telescopically along the slot 3112a, specifically, the cam 3113 in fig. 4 is in a locking mode, when the cam 3113 rotates clockwise, the lock tongue 3111 slides out along the extending direction of the slot 3112a disposed circumferentially of the cam 3113 and abuts against the card holder 221, so as to realize the mating locking of the lock head 311 and the piston 220; in fig. 5, the cam 3113 is in an unlocking mode, when the cam 3113 rotates counterclockwise, the lock tongue 3111 slides inward along a chute 3112a provided in the circumferential direction of the cam 3113, and the lock tongue 3111 is disconnected from the card holder 221, so that unlocking is achieved.

In some embodiments, referring to fig. 2 and 3, a lever 3114 is connected to a bottom of the cam 3113, at least one end of the lever 3114 is inserted through the push rod 310 and is inserted into the drum 320, and the lever 3114 is rotatable with the drum 320 to rotate the cam 3113.

In this embodiment, the cam 3113 has a T-shaped structure, i.e. an extension portion extends downward, the lever 3114 passes through the extension portion along the horizontal direction, the extending direction of the lever 3114 is perpendicular to the axial direction of the extension portion, two ends of the lever 3114 pass through the empty sleeve and are connected with the drum 320 outside the push rod 310, and when the drum 320 is driven to rotate by the first driving mechanism 400, the lever 3114 drives the cam 3113 to rotate around the axial direction, so as to realize the sliding out or sliding in of the lock tongue 3111.

In some embodiments, referring to fig. 6 and 7, the first drive mechanism 400 includes:

A first driving member 410, wherein the first driving member 410 is disposed on the syringe adapter 100;

the rotating seat 420 is rotatably disposed on the syringe adapter 100 and sleeved on the rotating drum 320, the output execution end of the first driving member 410 is connected with the rotating seat 420 through the first transmission assembly 430, and the rotating drum 320 can move along with the push rod 310 relative to the rotating seat 420 and can rotate along with the rotating seat 420.

In this embodiment, the first driving member 410 is fixed in the syringe adapter 100 through a bracket, and the rotating seat 420 is sleeved outside the rotating cylinder 320 and is locked with the rotating cylinder 320 in the circumferential direction. Alternatively, the cross-sectional shape of the drum 320 may be a special shape as shown in fig. 7, and the hole shape of the fitting hole of the rotating seat 420 for fitting the drum 320 is the same as the cross-sectional shape of the drum 320. In addition, the cross-sectional shape of the drum 320 may be triangular, square, or the like, and may be set according to practical situations. In addition, the inner wall surface of the rotating seat 420 may be provided with a sliding groove extending along the axial direction thereof, and the outer wall surface of the rotating cylinder 320 may be provided with a sliding portion adapted to the sliding groove and inserted into the sliding groove. The rotary drum 320 is rotatable with the rotary drum 320 and movable in the axial direction of the rotary drum 320 by the engagement of the sliding portion provided with the sliding groove on the inner wall surface of the rotary seat 420. The rotary mount 420 is rotatably mounted within the syringe adapter 100 by bearings. Alternatively, the first driving member 410 employs a first motor. When unlocking is required, the first driving member 410 drives the rotating seat 420 to rotate, the rotating seat 420 drives the rotary drum 320 to rotate, and the rotary drum 320 drives the plurality of lock bolts 3111 to retract into the lock head 311 and not to be clamped and matched with the clamping seat 221 of the piston 220; when locking is required, the first driving member 410 drives the rotating seat 420 to rotate, the rotating seat 420 drives the rotating cylinder 320 to rotate, and the rotating cylinder 320 drives the plurality of locking bolts 3111 to extend out of the locking head 311 and to be clamped and matched with the clamping seat 221 of the piston 220, so that the push rod 310 and the piston 220 are locked.

In some embodiments, the first transmission assembly 430 includes:

The first gear 431 and the second gear 432 are engaged with each other, the first gear 431 is disposed at the output end of the first driving member 410, and the second gear 432 is connected to the drum 320 through the rotation seat 420.

In this embodiment, the rotating base 420 is further connected to the second gear 432, the first gear 431 is connected to the first driving member 410, and is meshed with the second gear 432 through the first gear 431, when the first driving member 410 drives the second gear 432 to rotate through the first gear 431, the rotating base 420 rotates by a corresponding angle, and further drives the lever 3114 on the drum 320 to rotate by the same angle.

In some embodiments, referring to fig. 1, further comprising:

The second driving mechanism 500 is disposed on the syringe adapter 100, and the second driving mechanism 500 is used for driving the push rod 310 to lift.

In this embodiment, the syringe 200 is provided with the injection cavity 230, the second driving mechanism 500 drives the push rod 310 to move up and down, and the lock 311 can drive the piston 220 to move up and down in the syringe 200 under the driving of the push rod 310, so as to suck the liquid medicine into the injection cavity 230 or discharge the liquid medicine out of the injection cavity 230.

In some embodiments, referring to fig. 1, the second drive mechanism 500 includes:

The screw rod assembly 510, the screw rod assembly 510 includes screw rod 511 and nut seat 512 that cooperates with screw rod 511 whorl, the push rod 310 is set up in the screw rod 511 and connected with nut seat 512;

And the output execution end of the second driving piece 520 is connected with one end of the screw rod 511 through a second transmission component 530 and is used for driving the screw rod 511 to rotate.

In this embodiment, the second driving member 520 is fixed to the side of the syringe adapter 100 through a bracket, the screw rod 511 of the screw rod assembly 510 is disposed along the vertical direction, and one end of the screw rod 511 is connected to the output execution end of the second driving member 520. The second driving member 520 drives the screw rod 511 of the screw rod assembly 510 to rotate, and the nut seat 512 moves along the vertical direction under the action of the screw thread fit of the screw rod 511 to drive the push rod 310 to lift, wherein the second driving member 520 drives the screw rod 511 of the screw rod assembly 510 to rotate along different directions, and the push rod 310 correspondingly lifts or descends. For example, when the second driving member 520 drives the screw 511 of the screw assembly 510 to rotate clockwise, the push rod 310 is lifted; when the second driving member 520 drives the screw 511 of the screw assembly 510 to rotate in the counterclockwise direction, the push rod 310 descends. Alternatively, the second driver 520 employs a second motor.

In some embodiments, referring to fig. 1, the second transmission assembly 530 includes a timing belt 531 and two timing wheels 532;

one of the two synchronizing wheels 532 is connected with the output executing end of the second driving member 520, the other one of the two synchronizing wheels 532 is connected with one end of the screw rod 511, and the synchronous belt 531 is sleeved on the two synchronizing wheels 532.

In this embodiment, the second transmission assembly 530 is composed of a synchronous belt 531 and two synchronous wheels 532, the output power of the second driving member 520 is transmitted to one of the two synchronous wheels 532 by the output shaft of the first driving member 410, the synchronous wheels 532 drive the synchronous belt 531 to transmit, and then the synchronous belt 531 drives the synchronous wheels 532 to rotate, so as to drive the screw rod 511 to rotate.

In some embodiments, referring to fig. 8, further comprising an infusion bottle 600 and an infusion tube assembly 700;

The infusion tube assembly 700 comprises a three-way check valve 740, a first infusion tube 710, a second infusion tube 720 and a third infusion tube 730 which are respectively connected with the three-way check valve 740, wherein the first infusion tube 710 is connected with the infusion bottle 600 and the three-way check valve 740, the second infusion tube 720 is connected with the three-way check valve 740 and the syringe 200, one end of the third infusion tube 730 is communicated with the three-way check valve 740, and the other end is used for outputting liquid medicine.

In this embodiment, the infusion bottle 600 may be a storage device such as an infusion bag, the middle end of the infusion tube assembly 700 is provided with a three-way check valve 740, the three-way check valve 740 is respectively connected with the first infusion tube 710, the second infusion tube 720 and the third infusion tube 730, the three-way check valve 740 is connected with a valve port connected with the first infusion tube 710 and a valve port connected with the third infusion tube 730 in a unidirectional way, two ends of the first infusion tube 710 are respectively connected with the infusion bottle 600 and the three-way check valve 740 for guiding the liquid medicine from the infusion bottle 600 to the three-way check valve 740, one end of the second infusion tube 720 is connected with the three-way check valve 740, the other end is connected with the syringe 200 for guiding the liquid medicine injected from the first infusion tube 710 into the injection cavity 230 in the syringe 200, one end of the third infusion tube 730 is connected with the third valve port arranged between the first infusion tube 710 and the second infusion tube 720 at intervals on the three-way check valve 740, and the other end is connected with external devices such as a needle for injecting the liquid medicine into a patient.

The above description of the preferred embodiments of the present utility model should not be taken as limiting the scope of the utility model, but rather should be understood to cover all modifications, variations and adaptations of the present utility model using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present utility model to other relevant arts and technologies.

Claims

1. A medical fluid injection apparatus, comprising:

a needle cylinder adapter;

2. The medical fluid injection apparatus of claim 1, wherein the locking head further comprises a base and a cam disposed on the base, and the plurality of locking tongues are disposed on the base and located in a circumferential direction of the cam, and the plurality of locking tongues are rotatable with the cam to extend and retract in a radial direction of the cam.

3. The medical fluid injection apparatus of claim 2, wherein the base is provided with a plurality of sliding grooves circumferentially arranged along the base, and each locking tongue is correspondingly and slidably arranged in one sliding groove;

4. A medical fluid injection apparatus according to claim 3, wherein a deflector rod is connected to the bottom of the cam, at least one end of the deflector rod passes through the push rod and is inserted into the rotary drum, and the deflector rod can rotate with the rotary drum to drive the cam to rotate.

5. The medical fluid injection apparatus of claim 1, wherein the first drive mechanism comprises:

the first driving piece is arranged on the needle cylinder adapter seat;

6. The medical fluid injection apparatus of claim 5, wherein the first transmission assembly comprises:

7. The medical fluid injection apparatus of claim 1, further comprising:

8. The medical fluid injection apparatus of claim 7, wherein the second drive mechanism comprises:

9. The medical fluid injection apparatus of claim 8, wherein the second transmission assembly comprises a timing belt and two timing wheels;

10. The medical fluid injection apparatus of claim 1, further comprising an infusion bottle and infusion tube assembly;