A needle-free syringe for high-efficiency continuous injection

Abstract

The present invention discloses a high-efficiency continuous injection needle-free syringe, characterized in that it includes a shell, an ampoule bottle, a fixed bracket, and a piston rod, wherein the ampoule bottle is arranged at the front end of the shell, the rear end of the shell is fixedly connected to the fixed bracket, the piston rod is coaxially penetrated in the shell, the front end of the piston rod is penetrated into the ampoule bottle, and the rear end is passed out through a fixed seat, the piston rod is provided with an elastic component and axially elastically connected with the shell, the fixed bracket is provided with a driving device for driving the piston rod to move axially, and the fixed bracket is also provided with a locking device for locking the piston rod when it moves back to a preset position. The needle-free syringe of the present invention has a simple structure and is easy to use. It can quickly realize high-efficiency continuous injection through the continuous forward and reverse rotation of the motor, prevent air inlet when sucking medicine, and prevent back suction when injecting, thereby improving the quality of poultry vaccination.

Description

Technical Field

[0001] The invention relates to medical equipment, in particular to a high-efficiency continuous injection needle-free injector. Background Art

[0002] For veterinary needle syringes, the potential harm caused by animal stress response to the animal itself and medical personnel cannot be ignored. In this case, needle-free syringes came into being. However, animal vaccinations are often carried out in a centralized manner. In this case, traditional needle-free syringes have problems such as low efficiency, complex operation, and unstable operation. In addition, traditional syringes need to re-absorb the drug after each injection, which is inefficient for large-scale vaccination.

[0003] The needle-free syringes that can achieve continuous injection on the market must be equipped with a separate air supply device, which is so bulky that it is inconvenient for staff to operate. The design is complex and the injection power cannot be adjusted, so the drug dosage cannot be adjusted. In addition, since the general needle-free syringe draws the drug from the ampoule bottle to the external liquid bottle, the outside air can easily enter the syringe from the injection nozzle during the drug absorption, causing contamination of the liquid medicine; and because of the high injection pressure, the liquid medicine can easily flow back from the injection head cavity to the flow path or even back to the liquid medicine bottle during injection, affecting the injection effect and posing a risk of contaminating the liquid medicine bottle, which poses a safety hazard.

[0004] Therefore, it is necessary to develop a needle-free syringe which is simple in structure, easy to use and can be used for efficient and continuous injection during animal vaccination. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned shortcomings of the background technology and provide a needle-free syringe which is simple in structure, easy to use and can be used for efficient and continuous injection during animal vaccination.

[0006] The technical solution of the present invention is: a high-efficiency continuous injection needle-free syringe, characterized in that it includes a housing, an ampoule bottle, a fixed bracket, a piston rod,

[0007] The ampoule bottle is arranged at the front end of the shell, and the rear end of the shell is fixedly connected to the fixed bracket. The piston rod is coaxially penetrated in the shell, and the front end of the piston rod is penetrated into the ampoule bottle, and the rear end passes through the fixed bracket. The piston rod is provided with an elastic component and axially elastically connected with the shell. The fixed bracket is provided with a driving device for driving the piston rod to move axially. The fixed bracket is also provided with a locking device for locking the piston rod when it moves back to a preset position.

[0008] Preferably, the fixed bracket includes a first mounting plate and a second mounting plate spaced apart in front and back, and a limiting tube shell arranged between the first mounting plate and the second mounting plate for limiting the piston rod to only axial movement, the edges of the first mounting plate and the second mounting plate are fixedly connected by a plurality of mounting rods arranged in the front and rear directions, the front and rear ends of the limiting tube shell are fixedly connected to the first mounting plate and the second mounting plate respectively, a movable groove is opened at the bottom of the limiting tube shell from back to front, and the piston rod is provided with a transmission protrusion downwardly that passes through the movable groove accordingly.

[0009] Furthermore, the driving device includes a high-speed brushless motor arranged behind the second mounting plate, the base of the high-speed brushless motor is fixedly connected to the second mounting plate, a cylindrical cam is fixedly connected to the rotating end of the high-speed brushless motor, a mounting hole is provided on the second mounting plate to cooperate with the cylindrical cam, the front end of the cylindrical cam is rotatably connected to the first mounting plate, and an arc-shaped surface is provided on the cylindrical cam to cooperate with the transmission protrusion to drive the transmission protrusion to move forward and backward when the cylindrical cam rotates.

[0010] Furthermore, the locking device includes a locking block arranged downward in front of the movable groove of the limiting tube shell, a locking groove is provided at the bottom of the locking block, and a convex body is provided on the cylindrical cam for cooperating with the locking groove for locking when the piston rod moves back to a preset position.

[0011] Furthermore, a decompression spring is provided between the piston rod and the second mounting plate, and the front and rear ends of the decompression spring are fixedly connected to the second mounting plate and the rear end of the piston rod respectively, and when the piston rod moves backward to a preset position, the decompression spring is in a natural state.

[0012] Preferably, the elastic component includes a spring, a radial protrusion on the piston rod forms a limit ring, the outer wall of the limit ring is slidingly sealed with the inner wall of the shell, the spring is inserted between the upper limit ring of the piston rod and the rear end of the shell and the two ends are respectively connected to the limit ring and the rear end surface of the shell.

[0013] Preferably, the ampoule bottle includes a bottle body, a front cover and a protective shell, a second flow path for the piston rod to enter is provided at the center of the bottle body in the front-to-back direction, the front cover is fixedly connected to the front end of the bottle body and an injection nozzle is provided on the front cover and connected to the front end of the second flow path, the protective shell is arranged around the front cover and fixedly connected to the bottle body, an anti-air intake device is provided between the front cover and the second flow path to prevent air from entering from the injection nozzle when inhaling the medicine; the bottle body is also provided with a first flow path for absorbing the medicinal solution, the front end of the first flow path is connected to the front end of the second flow path through a radial channel, and an anti-backflow device is provided in the first flow path to prevent the medicinal solution from flowing out of the first flow path during injection.

[0014] Furthermore, a first connecting hole connected to the second flow path is provided at the front end of the bottle body, and the anti-air intake device includes a first mounting cavity axially arranged on the front cover, and a first return spring and an anti-air intake ball arranged in the first mounting cavity, the front end of the first mounting cavity is connected to the injection nozzle, and the rear end is connected to the first connecting hole, the front end of the first return spring is fixedly connected to the first mounting cavity, and the rear end is fixedly connected to the anti-air intake ball, and under normal conditions, the first return spring is in a compressed state and the anti-air intake ball seals the first connecting hole.

[0015] Furthermore, the first flow path includes an axial flow section arranged along the axial direction of the bottle body and a radial flow section connected to the rear end of the axial flow section. The outer end of the radial flow section leads to the outer wall of the rear part of the bottle body and is provided with a connection port for connecting a medicine bottle.

[0016] Furthermore, the anti-backflow device includes a second installation cavity arranged at the front end of the axial flow section and a second return spring and an anti-backflow ball arranged in the second installation cavity. The front end of the second installation cavity is connected to the outer end of the channel, and the rear end is provided with a second connecting hole connected to the axial flow section. The front end of the second return spring is fixedly connected to the second installation cavity, and the rear end is fixedly connected to the anti-backflow ball. Under normal circumstances, the second return spring is in a compressed state and the anti-backflow ball seals the second connecting hole.

[0017] The beneficial effects of the present invention are:

[0018] 1. The piston rod is provided with a transmission protrusion which cooperates with the movable groove of the limit tube shell to limit the piston rod to only axial movement. When the high-speed brushless motor rotates forward, the transmission protrusion under the piston rod moves slowly along the arc track of the cylindrical cam and compresses the spring on the piston rod. When the piston rod moves back to the preset position, the spring is compressed. At this time, the convex body on the cylindrical cam cooperates with the locking groove on the limit tube shell to lock, thereby temporarily locking the spring. When the high-speed brushless motor reverses rapidly, the spring is quickly released to push the piston rod, thereby realizing high-speed jetting and completing one injection. High-efficiency continuous injection can be quickly achieved through continuous forward and reverse rotation of the motor.

[0019] 2. When injecting the medicine, the anti-air intake ball is pushed away due to the pressure provided by the syringe, and the medicine can be injected or sprayed out normally. When the spraying is completed, the first return spring makes the anti-air intake ball block the first connecting hole again to isolate the contact between air and the medicine; and during injection, the pressure inside the second flow path presses the anti-backflow ball firmly against the second connecting hole to block the first flow path, thereby preventing the medicine from flowing back into the medicine bottle during injection.

[0020] 3. When the medicine is sucked, the anti-backflow ball is pushed away under the action of pressure, and the medicine passes through the first flow path to the second flow path. When the suction is completed, under the action of the second return spring, the anti-backflow ball is reset to block the backflow of the medicine; and when sucking the medicine, the negative pressure inside the second flow path causes the anti-air intake ball to firmly press the first connecting hole, blocking the first flow path to prevent air from entering.

[0021] 4. The needle-free syringe of the present invention has a simple structure, is easy to use, and has a small size. It can quickly achieve high-efficiency continuous injection through the continuous forward and reverse rotation of the motor, prevent air intake when sucking medicine, and prevent back suction when injecting, thereby improving the quality of poultry vaccination. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an axial cross-sectional view of the needle-free syringe of the present invention (under normal conditions)

[0023] Figure 2 for Figure 1 Enlarged view of the ampoule bottle

[0024] Figure 3 The three-dimensional structure diagram of the needle-free syringe of the present invention

[0025] Figure 4 Schematic diagram of the connection between the piston rod, the limit tube housing and the cylindrical cam of the present invention (under the locked state)

[0026] Figure 5 This is a three-dimensional connection diagram of the piston rod, the limit tube shell, and the cylindrical cam of the present invention (in the locked state)

[0027] Figure 6 Schematic diagram of the cylindrical cam structure of the present invention

[0028] Figure 7 This is an axial cross-sectional view of the needle-free syringe of the present invention (in the drug-inhaling state)

[0029] Figure 8 for Figure 7 Enlarged view of the ampoule bottle

[0030] Fig. 9 Axial cross-sectional view of the needle-free syringe of the present invention (in locked state)

[0031] Fig.10 Axial cross-sectional view of the ampoule (injection state)

[0032] Wherein: 1-shell 2-ampoule bottle 3-fixed bracket 4-piston rod 5-spring 6-transmission protrusion 7-high-speed brushless motor 8-cylindrical cam 81-arc track 82-bearing 9-locking block 91-locking groove 10-convex body 11-second flow path 12-injection nozzle 13-first flow path (13.1-axial flow section 13.2-radial flow section) 14-channel 15-first connecting hole 16-first mounting cavity 17-first return spring 18-anti-air intake ball 19-connecting port 20-second mounting cavity 21-bottle body 22-front cover 23-protective shell 24-second return spring 25-anti-backflow ball 26-second connecting hole 31-first mounting plate 32-second mounting plate 33-limiting tube shell 34-mounting rod 35-movable groove 36-mounting hole. DETAILED DESCRIPTION

[0033] The present invention is further described in detail in the following specific embodiments. The embodiments of the present invention are described in detail below, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] like Figure 1-6As shown, the present invention provides a high-efficiency continuous injection needle-free syringe, including a shell 1, an ampoule bottle 2, a fixed bracket 3, and a piston rod 4. The ampoule bottle 2 is arranged at the front end of the shell 1, and the rear end of the shell 1 is fixedly connected to the fixed bracket 3. The piston rod 4 is coaxially penetrated in the shell 1, and the front end of the piston rod 4 is penetrated into the ampoule bottle 1, and the rear end passes through the fixed seat 3. The piston rod 4 is provided with an elastic component and axially elastically connected with the shell 1. The fixed bracket 3 is provided with a driving device for driving the piston rod 4 to move axially. The fixed bracket 3 is also provided with a locking device for locking the piston rod 4 when it moves back to a preset position. In this embodiment, the shell 1 and the ampoule bottle 2 are coaxially connected, and the shell 1 is axially, that is, Figure 1 In the left and right directions, an ampoule bottle 2 is arranged at the axial front end of the shell 1, and a fixing seat 3 is arranged at the rear end.

[0037] In this embodiment, the elastic component includes a spring 5, a radial protrusion on the piston rod 4 forms a limit ring 41, the outer wall of the limit ring 41 is slidably sealed with the inner wall of the housing 1, and the spring 5 is inserted between the upper limit ring 41 on the piston rod 4 and the rear end of the housing 1, and the two ends are respectively connected to the limit ring 41 and the rear end surface of the housing 1. Normally, the spring 5 is in a slightly compressed state, the front end of the piston rod 4 is pressed against the inside of the ampoule bottle 2, and there is a certain axial spacing between the limit ring 41 and the front end of the housing 2.

[0038] The fixed bracket 3 includes a first mounting plate 31 and a second mounting plate 32 which are arranged at a relative interval front and back, and a limiting tube shell 33 which is arranged between the first mounting plate 31 and the second mounting plate 32 and is used to limit the piston rod 4 to only axial movement. The edges of the first mounting plate 31 and the second mounting plate 32 are fixedly connected by a plurality of mounting rods 34 arranged in the front-to-back direction. The front and rear ends of the limiting tube shell 33 are respectively fixedly connected to the first mounting plate 31 and the second mounting plate 32. The bottom of the limiting tube shell 33 is provided with a movable groove 35 from back to front, and the piston rod 4 is provided with a transmission protrusion 6 downwardly corresponding to pass through the movable groove 35. In this embodiment, the first mounting plate 31 and the second mounting plate 32 are plate members arranged vertically in the length direction, and the plate surface thereof is perpendicular to the axial direction. There are four mounting rods 34 arranged at the four corners of the first mounting plate 31 and the second mounting plate 32.

[0039] The driving device includes a high-speed brushless motor 7 arranged at the rear of the second mounting plate 32. The base of the high-speed brushless motor 7 is fixedly connected to the second mounting plate 32 by a plurality of bolts (not shown in the figure). A cylindrical cam 8 is fixedly connected to the rotating end of the high-speed brushless motor 7. A mounting hole 36 is provided on the second mounting plate 32 to cooperate with the cylindrical cam 8. A bearing 82 (a deep groove ball bearing can be selected) is provided at the front end of the cylindrical cam 8 to be rotatably connected to the first mounting plate 31. An arc track 81 is provided on the cylindrical cam 8 to cooperate with the transmission protrusion 6 to drive the transmission protrusion 6 to move forward and backward when the cylindrical cam 8 rotates. In this embodiment, the axial direction of the movable end of the high-speed brushless motor 7 and the axial direction of the cylindrical cam 8 are both arranged along the front-to-back direction. The arc track 81 can be a groove-shaped track that cooperates with the front and rear edges of the transmission protrusion 6, or it can be a Figure 4 The edge-shaped track only cooperates with the leading edge of the transmission protrusion 6.

[0040] The locking device includes a locking block 9 disposed downwardly in front of the movable groove 35 of the limiting tube housing 33, a locking groove 91 is provided at the bottom of the locking block 9, and a convex body 10 is provided on the cylindrical cam 8 for locking with the locking groove 91 when the piston rod 4 moves back to a preset position. Figure 4 As shown in the figure, when the high-speed brushless motor 7 rotates forward, it drives the cylindrical cam 8 to rotate clockwise, and the arc track 81 drives the transmission protrusion 6 to move backward. The protrusion 10 is formed by the surface of the cylindrical cam 8 gradually protruding along the forward rotation direction of the high-speed brushless motor 7.

[0041] In this embodiment, a decompression tension spring (not shown) is further provided between the piston rod 4 and the second mounting plate 32. The front and rear ends of the decompression tension spring are respectively fixedly connected to the second mounting plate 32 and the rear end of the piston rod 4, and when the piston rod 4 moves back to the preset position, the decompression tension spring is in a natural state. The decompression tension spring serves to slow down the forward speed of the piston rod 4 when the amount of medicine is small at the end of the injection.

[0042] The ampoule bottle 2 includes a bottle body 21, a front cover 22 and a protective shell 23. The center of the bottle body 21 is provided with a second flow path 11 for the piston rod 4 to enter in the front-to-back direction. The front cover 22 is fixedly connected to the front end of the bottle body 21 and is provided with an injection nozzle 12 connected to the front end of the second flow path 11. The protective shell 23 is arranged around the front cover 22 and is fixedly connected to the bottle body 21. In this embodiment, a pointed top is arranged forward at the center of the front cover 22, and the injection nozzle 12 is opened at the pointed top. The front end of the protective shell 23 is flush with the front end of the pointed top. An anti-intake device is arranged between the front cover 22 and the second flow path 11 to prevent air from entering from the injection nozzle 12 when the medicine is sucked; the bottle body 21 is also provided with a first flow path 13 for sucking the liquid medicine. The front end of the first flow path 13 is connected to the front end of the second flow path 11 through a radial channel 14. An anti-back suction device is arranged in the first flow path 13 to prevent the liquid medicine from flowing out of the first flow path 13 during injection. In this embodiment, the first flow path 13 includes an axial flow path section 13.1 arranged along the axial direction of the bottle body 21 and a radial flow path section 13.2 connected to the rear end of the axial flow path section 13.1. The outer end of the radial flow path section 13.2 leads to the rear outer wall of the bottle body 21 and is provided with a connection port 19 for connecting a medicine bottle.

[0043] A first connecting hole 15 communicating with the second flow path 11 is arranged at the center of the front end of the bottle body 21. The anti-air intake device includes a first mounting cavity 16 axially arranged on the front cover 2, and a first return spring 17 and an anti-air intake ball 18 arranged in the first mounting cavity 16. The front end of the first mounting cavity 16 is communicated with the injection nozzle 12, and the rear end is communicated with the first connecting hole 15. The front end of the first return spring 17 is fixedly connected to the first mounting cavity 16, and the rear end is fixedly connected to the anti-air intake ball 18. Under normal conditions, the first return spring 17 is in a compressed state and the anti-air intake ball 18 seals the first connecting hole 15.

[0044] The anti-backflow device includes a second installation cavity 20 arranged at the front end of the axial flow section 13.1, and a second return spring 24 and an anti-backflow ball 25 arranged in the second installation cavity 20. The front end of the second installation cavity 20 is connected with the outer end of the channel 14, and the rear end is provided with a second connecting hole 26 connected with the axial flow section 13.1. The front end of the second return spring 24 is fixedly connected to the second installation cavity 20, and the rear end is fixedly connected to the anti-backflow ball 25. Under normal conditions, the second return spring 24 is in a compressed state and the anti-backflow ball 25 seals the second connecting hole 26.

[0045] The working principle of the present invention is:

[0046] like Figure 1 As shown, in normal state: the front end of the piston rod 4 is pressed against the front end of the second flow path 11, the spring 5 is in a slightly compressed state, there is a certain axial distance between the stop ring 41 and the front end of the housing 2, the transmission protrusion 6 is located at the front end of the movable groove 35, and the lower end of the transmission protrusion 6 is in contact with the arc track 81. Figure 2As shown, under normal conditions: the first return spring 17 of the ampoule bottle 2 is in a slightly compressed state and the anti-air intake ball 18 seals the first connecting hole 15; the second return spring 24 is in a slightly compressed state and the anti-backflow ball 25 seals the second connecting hole 26.

[0047] like Figure 7 As shown, when the medicine is inhaled: the high-speed brushless motor rotates forward, and the transmission protrusion 6 on the piston rod 4 slowly moves backward along the arc track 81 of the cylindrical cam 8 and compresses the spring 5, as shown in FIG. Fig. 9 As shown, when the piston rod 4 moves back to the preset position, the protrusion 10 on the cylindrical cam 8 cooperates with the locking groove 91 on the limiting tube housing 33, thereby temporarily locking the piston rod 4 and locking the compressed spring 5. Figure 8 As shown, when the medicine is inhaled: the piston rod 4 moves backward to generate negative pressure in the second flow path 11 of the ampoule bottle 2, and the anti-backflow ball 25 is pushed open under the action of pressure, and the second return spring 24 is in a compressed state, and the medicine passes through the first flow path 13 to the second flow path 11. When the liquid is inhaled, under the action of the second return spring 24, the anti-backflow ball 25 is reset to block the backflow of the medicine; and when the medicine is inhaled, the negative pressure inside the second flow path 11 causes the anti-air intake ball 18 to firmly press the first connecting hole 15, thereby blocking the second flow path 11 and preventing air from entering.

[0048] During injection: the high-speed brushless motor quickly reverses, the convex body 10 on the cylindrical cam 8 disengages from the locking groove 91 on the limiting tube shell 33, and the spring 5 is quickly released to push the piston rod 4 forward. Fig.10 As shown, during injection, the pressure in the second flow path 13 in the ampoule bottle 2 is much greater than the elastic force of the first return spring 17, and the anti-air intake ball 18 moves away from the first connecting hole 15, so that the liquid medicine flows out through the injection nozzle 12, thereby realizing high-speed jet, and the needle-free injector completes the injection. Moreover, during injection, under the combined action of the pressure in the second flow path 11 and the second return spring 24, the anti-backflow ball 25 firmly presses the second connecting hole 26 to prevent the liquid medicine from flowing back into the medicine bottle.

[0049] After the needle-free syringe completes the injection, it returns to normal, such as Figure 1 As shown, the front end of the piston rod 4 is pressed against the front end of the second flow path 11 , the transmission protrusion 6 returns to the front end of the movable groove 35 , and the lower end of the transmission protrusion 6 returns to the starting position of the arc track 81 .

[0050] The above process is one working cycle, and the needle-free injector can achieve multiple continuous injections by repeating the working cycle.

Claims

1. A high-efficiency continuous injection needle-free syringe, characterized in that: It comprises a housing (1), an ampoule bottle (2), a fixing bracket (3), and a piston rod (4). The ampoule bottle (2) is arranged at the front end of the shell (1), and the rear end of the shell (1) is fixedly connected to the fixed bracket (3). The piston rod (4) is coaxially inserted into the shell (1). The front end of the piston rod (4) is inserted into the ampoule bottle (1), and the rear end is inserted through the fixed bracket (3). The piston rod (4) is provided with an elastic component to elastically connect the piston rod (4) with the shell (1) in an axial direction. The fixed bracket (3) is provided with a driving device for driving the piston rod (4) to move axially. The fixed bracket (3) is also provided with a locking device for locking the piston rod (4) when the piston rod (4) moves back to a preset position. The fixing bracket (3) comprises a first mounting plate (31) and a second mounting plate (32) which are arranged at a front-to-back interval, and a limiting tube shell (33) which is arranged between the first mounting plate (31) and the second mounting plate (32) and is used to limit the piston rod (4) to only axial movement. The edges of the first mounting plate (31) and the second mounting plate (32) are fixedly connected by a plurality of mounting rods (34) arranged in the front-to-back direction. The front and rear ends of the limiting tube shell (33) are respectively fixedly connected to the first mounting plate (31) and the second mounting plate (32). A movable groove (35) is provided at the bottom of the limiting tube shell (33) from the back to the front. The piston rod (4) is provided with a transmission protrusion (6) facing downwards and correspondingly passes through the movable groove (35).

2. The high-efficiency continuous injection needle-free syringe according to claim 1, characterized in that: The driving device comprises a high-speed brushless motor (7) arranged behind a second mounting plate (32); a base of the high-speed brushless motor (7) is fixedly connected to the second mounting plate (32); a cylindrical cam (8) is fixedly connected to the rotating end of the high-speed brushless motor (7); a mounting hole (36) is provided on the second mounting plate (32) to cooperate with the cylindrical cam (8); a front end of the cylindrical cam (8) is rotatably connected to the first mounting plate (31); an arc track (81) is provided on the cylindrical cam (8) to cooperate with the transmission protrusion (6) for driving the transmission protrusion (6) to move forward and backward when the cylindrical cam (8) rotates.

3. The high-efficiency continuous injection needle-free syringe according to claim 2, characterized in that: The locking device comprises a locking block (9) arranged downwardly in front of the movable groove (35) of the limiting tube housing (33), a locking groove (91) being provided at the bottom of the locking block (9), and a convex body (10) being provided on the cylindrical cam (8) for cooperating with the locking groove (91) for locking when the piston rod (4) moves backward to a preset position.

4. The high-efficiency continuous injection needle-free syringe according to claim 1, characterized in that: A decompression tension spring is also provided between the piston rod (4) and the second mounting plate (32), the front and rear ends of the decompression tension spring being fixedly connected to the second mounting plate (32) and the rear end of the piston rod (4) respectively, and when the piston rod (4) moves backward to a preset position, the decompression tension spring is in a natural state.

5. The high-efficiency continuous injection needle-free syringe according to claim 1, characterized in that: The elastic component comprises a spring (5), a radial protrusion on the piston rod (4) forms a limit ring (41), the outer wall of the limit ring (41) and the inner wall of the shell (1) are slidably sealed, and the spring (5) is inserted between the upper limit ring (41) of the piston rod (4) and the rear end of the shell (1), and the two ends are respectively connected to the limit ring (41) and the rear end surface of the shell (1).

6. The high-efficiency continuous injection needle-free syringe according to claim 1, characterized in that: The ampoule bottle (2) comprises a bottle body (21), a front cover (22) and a protective shell (23); a second flow path (11) for the piston rod (4) to enter is provided at the center of the bottle body (21) in the front-to-back direction; the front cover (22) is fixedly connected to the front end of the bottle body (21) and an injection nozzle (12) is provided on the front cover (22) and communicates with the front end of the second flow path (11); the protective shell (23) is arranged around the front cover (22) and is fixedly connected to the bottle body (21); an air inlet prevention device is provided between the front cover (22) and the second flow path (11) to prevent air from entering from the injection nozzle (12) when the medicine is inhaled; the bottle body (21) is also provided with a first flow path (13) for inhaling liquid medicine; the front end of the first flow path (13) is communicated with the front end of the second flow path (11) through a radial channel (14); and an anti-back suction device is provided in the first flow path (13) to prevent the liquid medicine from flowing out of the first flow path (13) when injected.

7. The high-efficiency continuous injection needle-free syringe according to claim 6, characterized in that: A first connecting hole (15) communicating with the second flow path (11) is arranged at the front end of the bottle body (21); the anti-air intake device comprises a first mounting cavity (16) axially arranged on the front cover (2), and a first return spring (17) and an anti-air intake ball (18) arranged in the first mounting cavity (16); the front end of the first mounting cavity (16) is communicated with the injection nozzle (12), and the rear end is communicated with the first connecting hole (15); the front end of the first return spring (17) is fixedly connected to the first mounting cavity (16), and the rear end is fixedly connected to the anti-air intake ball (18); under normal conditions, the first return spring (17) is in a compressed state and the anti-air intake ball (18) seals the first connecting hole (15).

8. The high-efficiency continuous injection needle-free syringe according to claim 6, characterized in that: The first flow path (13) comprises an axial flow path section (13.1) arranged along the axial direction of the bottle body (21) and a radial flow path section (13.2) connected to the rear end of the axial flow path section (13.1); the outer end of the radial flow path section (13.2) leads to the rear outer wall of the bottle body (21) and is provided with a connection port (19) for connecting to a medicine bottle.

9. The high-efficiency continuous injection needle-free syringe according to claim 8, characterized in that: The anti-backflow device comprises a second mounting cavity (20) arranged at the front end of the axial flow path section (13.1), and a second return spring (24) and an anti-backflow ball (25) arranged in the second mounting cavity (20); the front end of the second mounting cavity (20) is connected to the outer end of the channel (14), and the rear end is provided with a second connecting hole (26) connected to the axial flow path section (13.1); the front end of the second return spring (24) is fixedly connected to the second mounting cavity (20), and the rear end is fixedly connected to the anti-backflow ball (25); under normal conditions, the second return spring (24) is in a compressed state and the anti-backflow ball (25) seals the second connecting hole (26).

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