Needleless injector

Abstract

The invention relates to the technical field of syringes, in particular to a needleless syringe which comprises a mounting unit, a needle fixing unit and a needle fixing unit. The injection unit comprises a liquid storage pipe arranged in the accommodating space and a piston rod arranged in the liquid storage pipe in a sliding manner; the driving unit comprises a driving motor arranged in the containing space, a rotating disc arranged at the end of the driving motor and a push rod arranged on the mounting shell in a sliding mode, and the push rod and the piston rod can generate relative displacement. According to the needleless injector, the control part and the elastic part are matched to control the push rod to move in a reciprocating mode, then the piston rod is controlled to move in a reciprocating mode, liquid medicine in the liquid storage pipe is sucked and discharged, the elastic part controls the push rod to collide with the piston rod when moving, the liquid medicine discharging pressure of the liquid storage pipe is increased, and skin puncturing is facilitated; meanwhile, the moving speed after collision is reduced, the liquid medicine spraying pressure is reduced, and liquid medicine injection is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and more particularly to a needleless syringe. Background Art

[0002] Needleless syringes mainly utilize the principle of pressure jet. Pressure is generated by an internal pressure device to push the liquid medicine in the medicine tube through a microporous to form an extremely fine liquid medicine column, so that the liquid medicine instantly penetrates the human epidermis to reach the subcutaneous tissue, and the liquid medicine is absorbed in a dispersed state with a diameter of 3-5 cm under the skin.

[0003] The needleless syringe includes a medicine storage tube. The internal liquid medicine is pushed out by the movement of a piston to complete the injection. The reciprocating movement of the piston under the control of a motor is uniform, and its liquid suction and liquid discharge are carried out cyclically. There is no requirement for the movement of the piston during liquid suction. Currently, during liquid discharge, the uniform movement of the piston makes the pressure of the liquid medicine ejected from the medicine storage tube constant, which is not conducive to injection after penetrating the human epidermis. Summary of the Invention

[0004] In view of the problems existing in the above-mentioned existing needleless syringes, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a needleless syringe that is convenient for piercing the epidermis and convenient for injection.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A needleless syringe, comprising,

[0007] An installation unit, including an installation shell and a receiving space provided inside the installation shell;

[0008] An injection unit, including a liquid storage tube provided in the receiving space, a nozzle provided at an end of the liquid storage tube, and a piston rod slidably provided in the liquid storage tube; and,

[0009] A driving unit, including a driving motor provided in the receiving space, a turntable provided at an end of the driving motor, a control part provided on the turntable, a push rod slidably provided on the installation shell, and an elastic member provided between the push rod and the installation shell;

[0010] One end of the push rod cooperates with the control part, and the other end cooperates with the piston rod. The push rod and the piston rod can have a relative displacement;

[0011] The control part moves the push rod to drive the elastic member to deform. At the same time, when the push rod moves and contacts the piston rod, they move synchronously. When the elastic member returns to its original state, it controls the push rod and the piston rod to move synchronously after impact.

[0012] As a preferred embodiment of the needleless injector of the present invention, there is a sliding space between the push rod and the piston rod, and the push rod and the piston rod are in contact and limited to each other.

[0013] As a preferred embodiment of the needleless injector of the present invention, the moving distance of the relative displacement between the piston rod and the push rod is 1 cm - 8 cm.

[0014] As a preferred embodiment of the needleless injector of the present invention, a first one-way valve is provided in the nozzle;

[0015] A liquid inlet pipe is connected in the liquid storage tube, and a second one-way valve is provided between the liquid inlet pipe and the liquid storage tube.

[0016] As a preferred embodiment of the needleless injector of the present invention, the control part includes an initial surface provided on the turntable and a climbing surface connected to the initial surface;

[0017] One end of the climbing surface is attached to the initial surface, and the other end of the climbing surface is perpendicular to the height projection of the initial surface;

[0018] A sliding member is provided on the push rod, and the sliding member is matched with the initial surface and the climbing surface.

[0019] As a preferred embodiment of the needleless injector of the present invention, a first channel is provided inside the nozzle. One end of the first channel is connected to the liquid storage tube, and the other end of the first channel is circular with an inner diameter of 0.15 mm - 0.3 mm.

[0020] As a preferred embodiment of the needleless injector of the present invention, a liquid storage cavity and a liquid inlet cavity communicating with the liquid storage cavity are provided inside the liquid storage tube;

[0021] The nozzle is communicated with the liquid storage cavity, and the piston rod is slidably arranged in the liquid storage cavity;

[0022] The second one-way valve includes a valve body arranged in the liquid inlet cavity, a sealing surface arranged inside the valve body, a magnetic bead slidably arranged inside the valve body, and a limiting member arranged inside the valve body;

[0023] The magnetic bead slides between the limiting member and the sealing surface, and the sliding distance is 0.1 mm - 0.3 mm.

[0024] As a preferred embodiment of the needleless injector of the present invention, a first channel is provided inside the nozzle;

[0025] The first one-way valve includes a first spring disposed inside the first channel, a mounting member disposed at an end of the first spring, and a sealing ring disposed between the mounting member and the first channel;

[0026] The sealing ring is close to the liquid storage tube.

[0027] As a preferred embodiment of the needleless injector of the present invention, wherein: an installation block is provided inside the installation shell;

[0028] The push rod is slidably disposed on the installation block;

[0029] The drive motor is fixedly disposed on the installation block;

[0030] One end of the elastic member is connected to the push rod, and the other end is connected to the installation block.

[0031] As a preferred embodiment of the needleless injector of the present invention, wherein: a positioning portion is provided on the turntable;

[0032] The positioning portion includes a first position sensor disposed on the installation shell and a sensor trigger block disposed on the turntable;

[0033] When the first position sensor contacts the sensor trigger block, the control portion moves the push rod to the end of the stroke.

[0034] As a preferred embodiment of the needleless injector of the present invention, wherein: the drive unit further includes a trigger assembly;

[0035] The trigger assembly includes a trigger sleeve slidably sleeved outside the nozzle, a second spring disposed between the trigger sleeve and the liquid storage tube, and a second position sensor disposed on the liquid storage tube and cooperating with the trigger sleeve.

[0036] As a preferred embodiment of the needleless injector of the present invention, wherein: a locking piece is slidably inserted between the trigger sleeve and the liquid storage tube.

[0037] As a preferred embodiment of the needleless injector of the present invention, wherein: it further includes a control unit; the control unit includes a control main board and a battery disposed inside the installation shell, and a display disposed outside the installation shell;

[0038] The first position sensor, the second position sensor and the display are electrically connected to the control main board;

[0039] The battery is electrically connected to the drive motor and the control main board.

[0040] Advantages of the present invention: Through the cooperation of the control part and the elastic part, the reciprocating movement of the push rod can be controlled, and then the reciprocating movement of the piston rod can be controlled to realize the suction and discharge of the liquid medicine inside the liquid storage tube. When the elastic part controls the movement of the push rod, it will impact the piston rod, increasing the pressure of the liquid medicine discharged from the liquid storage tube, facilitating the puncture of the skin. At the same time, the moving speed decreases after the impact, and the spraying pressure of the liquid medicine decreases, facilitating the injection of the liquid medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0042] Figure 1 Shows an overall schematic diagram of the needleless injector;

[0043] Figure 2 Shows a first form schematic diagram of the sliding space of the needleless injection;

[0044] Figure 3 Shows a second form schematic diagram of the sliding space of the needleless injection;

[0045] Figure 4 Shows a third form schematic diagram of the sliding space of the needleless injection;

[0046] Figure 5 Shows a fourth form schematic diagram of the sliding space of the needleless injection;

[0047] Figure 6 Shows a first form schematic diagram of the control part of the needleless injection;

[0048] Figure 7 Shows a second form schematic diagram of the control part of the needleless injection;

[0049] Figure 8 Shows a top view of the second form of the control part of the needleless injection;

[0050] Figure 9 Shows a third form schematic diagram of the control part of the needleless injection;

[0051] Figure 10 Shows a schematic diagram of the liquid storage tube of the needleless injection;

[0052] Figure 11 Shows a second form schematic diagram of the limiting part of the needleless injection;

[0053] Figure 12 Shows a schematic diagram of the positioning part of the needleless injection;

[0054] Figure 13 Shows a schematic diagram of the trigger assembly for needleless injection;

[0055] Figure 14 Shows a schematic diagram of the control unit for needleless injection. Detailed implementation mode

[0056] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation mode and the accompanying drawings.

[0057] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention, but these terms may vary according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0058] Example 1, referring to Figures 1-9 , is the first embodiment of the present invention, providing a needleless syringe, which device includes a mounting unit 100, an injection unit 200, and a driving unit 300.

[0059] Among them, the mounting unit 100 includes a mounting shell 101, and an accommodation space 102 is provided inside the mounting shell 101, where the mounting shell 101 is cylindrical like a syringe barrel or gun-shaped with a handle.

[0060] The injection unit 200 includes a liquid storage tube 201 arranged in the accommodation space 102, a nozzle 202 arranged at the end of the liquid storage tube 201, and a piston rod 203 slidably arranged in the liquid storage tube 201. Among them, a part of the liquid storage tube 201 is located in the accommodation space 102, and the remaining part is in the external space. The nozzle 202 is installed at the end of the liquid storage tube 201 in the external space, and the suction and discharge of the liquid medicine inside the liquid storage tube 201 are realized by the reciprocating movement of the piston rod 203 inside the liquid storage tube 201;

[0061] Furthermore, a first channel 202b is provided inside the nozzle 202. One end of the first channel 202b is connected to the liquid storage tube 201, and the other end of the first channel 202b is circular with an inner diameter of 0.15 mm - 0.3 mm. The liquid medicine inside the liquid storage tube 201 is extruded by the piston rod 203 and sprayed out from the first channel 202b to complete the injection. At the same time, after the injection is completed, the nozzle 202 can be immersed in the liquid medicine, and the piston rod 203 is moved to suck the liquid medicine into the liquid storage tube 201 from the first channel 202b, facilitating subsequent continuous injection.

[0062] The driving unit 300 includes a driving motor 301 disposed in the accommodating space 102, a turntable 302 disposed at the end of the driving motor 301, a control unit 303 disposed on the turntable 302, a push rod 304 slidably disposed on the mounting shell 101, and an elastic member 305 disposed between the push rod 304 and the mounting shell 101, wherein the elastic member 305 is made of a spring, a metal elastic sheet, and other elastic bodies;

[0063] Furthermore, a mounting block 101a is provided inside the mounting shell 101; the push rod 304 is slidably disposed on the mounting block 101a; the driving motor 301 is fixedly disposed on the mounting block 101a; one end of the elastic member 305 is connected to the push rod 304, and the other end is connected to the mounting block 101a, wherein one end of the push rod 304 cooperates with the control unit 303, and the other end cooperates with the piston rod 203. The push rod 304 and the piston rod 203 can have relative displacement. A circular tube extends from the mounting shell 101 and sleeves the push rod 304, and one end of the extended circular tube is connected to the liquid storage tube 201.

[0064] There is a sliding space M between the push rod 304 and the piston rod 203, and the push rod 304 and the piston rod 203 are in contact and limited.

[0065] Such as Figure 2 , when the sliding space M is provided on the push rod 304, the end of the piston rod 203 is inserted into the sliding space M, and when the piston rod 203 moves to the end of the stroke in the sliding space M, it will contact the push rod 304 and thus be restricted from moving. The moving range of the piston rod 203 is the moving distance a of the relative displacement between the piston rod 203 and the push rod 304.

[0066] Such as Figure 3 , when the sliding space M is provided on the piston rod 203, the end of the push rod 304 is inserted into the sliding space M, and when the push rod 304 moves to the end of the stroke in the sliding space M, it will contact the piston rod 203 and thus be restricted from moving. The moving range of the push rod 304 is the moving distance a of the relative displacement between the piston rod 203 and the push rod 304.

[0067] Such as Figure 4 , the sliding space M is formed by a groove recessed on the side of the push rod 304 or the piston rod 203, or such as Figure 2 , the sliding space M is formed by a convex annular groove recessed at the end of the push rod 304 or the piston rod 203, or such as Figure 5 , the sliding space M is formed by a groove recessed on the side wall of a circular groove recessed at the end of the push rod 304 or the piston rod 203. A protrusion is provided at the end of the push rod 304 or the piston rod 203 inserted into the sliding space M to contact and limit the inner wall of the sliding space M.

[0068] Furthermore, the moving distance a of the relative displacement between the piston rod 203 and the push rod 304 is 1 cm - 8 cm.

[0069] Among them, the control unit 303 includes an initial surface 303a provided on the turntable 302 and a climbing surface 303b connected to the initial surface 303a; one end of the climbing surface 303b is attached to the initial surface 303a, and the other end of the climbing surface 303b is perpendicular to the height projection of the initial surface 303a; the climbing surface 303b is divided into a high end and a low end, the low end of the climbing surface 303b is attached to the initial surface 303a, and the side of the high end of the climbing surface 303b is perpendicular to the height projection of the initial surface 303a;

[0070] A sliding member 304a is provided on the push rod 304, and the sliding member 304a cooperates with the initial surface 303a and the climbing surface 303b, wherein the bottom end is attached to the initial surface 303a, and the attached angle is greater than 120°, facilitating the sliding member 304a to slide from the initial surface 303a to the climbing surface 303b; when the sliding member 304a moves to the high end on the climbing surface 303b, at this time the push rod 304 is pushed to move and compress the elastic member 305, and when the sliding member 304a leaves the high end of the climbing surface 303b, it will move with the push rod 304 and contact the initial surface 303a under the elastic force of the elastic member 305.

[0071] Among them, the drive motor 301 controls the rotation of the turntable 302, so that the control unit 303 slides relative to the sliding member 304a, and the sliding member 304a slides cyclically on the initial surface 303a and the climbing surface 303b. When the sliding member 304a slides from the initial surface 303a to the climbing surface 303b and moves to the high end on the climbing surface 303b, at this time the push rod 304 moves to compress the elastic member 305, and when it moves to the end of the stroke in the sliding space M, it will pull the piston rod 203 to move to suck the liquid storage tube 201, and at this time the liquid medicine can be sucked into the liquid storage tube 201;

[0072] When the sliding member 304a leaves the high end of the climbing surface 303b, it will move with the push rod 304 and contact the initial surface 303a under the elastic force of the elastic member 305. At this time, the push rod 304 accelerates and moves to the end of the stroke in the sliding space M under the elastic force of the elastic member 305 and will impact the piston rod 203 to pressurize and eject the liquid medicine in the liquid storage tube 201. After the impact, the speed decreases and the piston rod 203 is pushed to discharge the end of the liquid medicine; the impact increases the pressure of the liquid medicine discharged from the liquid storage tube 201, facilitating skin puncture. At the same time, after the impact, the moving speed decreases and the ejection pressure of the liquid medicine decreases, facilitating the injection of the liquid medicine into the body.

[0073] Furthermore, as Figure 6 , the initial surface 303a is provided on the end face of the turntable 302, the climbing surface 303b is made of an arc-shaped plate installed on the end face of the turntable 302, the surface of the arc-shaped plate is the climbing surface 303b, and a card slot is provided at the bottom of the sliding member 304a, and it is slidably matched with the initial surface 303a and the climbing surface 303b through the card slot.

[0074] Or as Figure 7 and Figure 8 , the initial surface 303a is arranged on the side surface of the turntable 302, and the climbing surface 303b is made of a triangular block installed on the side surface of the turntable 302. One side of the triangular block is arc-shaped, and the arc-shaped side is the climbing surface 303b. A clamping groove is provided at the bottom of the sliding member 304a, and it is slidably matched with the initial surface 303a and the climbing surface 303b through the clamping groove.

[0075] Or again as Figure 9 , a spiral groove is arranged on the side surface of the turntable 302. The spiral groove spirals for one week, and the height projections of both ends coincide and are communicated through a connecting groove. The low end of the spiral groove is the initial surface 303a, and the spiral part of the spiral groove is the climbing surface 303b. The bottom of the sliding member 304a is inserted into the spiral groove with a cylinder for sliding cooperation.

[0076] The using process includes: liquid extraction. The nozzle 202 contacts the liquid medicine. The driving motor 301 controls the turntable 302 to rotate forward. The sliding member 304a slides cyclically on the initial surface 303a and the climbing surface 303b. When the sliding member 304a slides from the initial surface 303a to the climbing surface 303b and moves to the high end on the climbing surface 303b, at this time, the push rod 304 moves to compress the elastic member 305, and at the same time, the piston rod 203 can be pulled to draw the liquid medicine into the liquid storage tube 201;

[0077] Liquid discharge: The nozzle 202 contacts the skin. The driving motor 301 controls the turntable 302 to rotate forward. After the sliding member 304a leaves the high end of the climbing surface 303b, it will move with the push rod 304 under the elastic force of the elastic member 305 and contact the initial surface 303a. At this time, the push rod 304 accelerates and moves to the end of the stroke under the elastic force of the elastic member 305 in the sliding space M and will impact the piston rod 203 to pressurize and spray the liquid medicine in the liquid storage tube 201;

[0078] Cleaning. During the first liquid discharge injection, the nozzle 202 contacts the liquid medicine. The driving motor 301 controls the turntable 302 to rotate forward. The sliding member 304a slides cyclically on the initial surface 303a and the climbing surface 303b. When the sliding member 304a slides from the initial surface 303a to the climbing surface 303b and moves to the high end on the climbing surface 303b, the liquid medicine is drawn into the liquid storage tube 201. Then the driving motor 301 controls the turntable 302 to rotate in the reverse direction. When the sliding member 304a moves from the high end of the climbing surface 303b to the initial surface 303a, at this time, the push rod 304 can push the piston rod 203 uniformly and slowly under the elastic force of the reset member to discharge the liquid medicine and air in the liquid storage tube 201, realizing cleaning and air discharge.

[0079] Embodiment 2, referring to Figure 10 and Figure 11, which is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: a first one-way valve 202a is provided in the nozzle 202; a liquid inlet pipe 201a is connected in the liquid storage pipe 201, and a second one-way valve 201b is provided between the liquid inlet pipe 201a and the liquid storage pipe 201. The first one-way valve 202a enables the liquid medicine in the liquid storage pipe 201 to only pass through the nozzle 202 unidirectionally and be discharged, and the external medium outside the nozzle 202 cannot pass through the nozzle 202 in the reverse direction and enter the liquid storage pipe 201. The liquid inlet pipe 201a is connected to the liquid medicine tank, and the second one-way valve 201b enables the liquid medicine in the liquid medicine tank to only pass through the liquid inlet pipe 201a unidirectionally and enter the liquid storage pipe 201, and the liquid medicine in the liquid storage pipe 201 cannot pass through the liquid inlet pipe 201a in the reverse direction.

[0080] The first one-way valve 202a includes a first spring 202a-1 disposed inside the first channel 202b, a mounting member 202a-2 disposed at the end of the first spring 202a-1, and a sealing ring 202a-3 disposed between the mounting member 202a-2 and the first channel 202b;

[0081] The sealing ring 202a-3 is close to the liquid storage pipe 201. One end of the first channel 202b communicates with the liquid storage pipe 201, and the other end communicates with the outside. The sealing ring 202a-3 is in contact with the inner wall of the nozzle 202 forming the first channel 202b at the mounting member 202a-2, thereby sealing the end of the liquid storage pipe 201 to achieve sealing.

[0082] Further, the mounting member 202a-2 can be made of a cylinder or a round bottom plus a pillar. Preferably, it is made of a cylinder. A protection space is formed inside the cylinder. The first spring 202a-1 is fixed to the inner wall of the nozzle 202 in the first channel 202b, and the other end is located inside the cylinder. The sealing ring 202a-3 can be embedded on the housing of the nozzle 202 or sleeved on the surface of the cylinder. A groove is provided on the surface of the cylinder for the sealing ring 202a-3 to be sleeved.

[0083] In the initial state, the first spring 202a-1 presses the mounting member 202a-2 so that the sealing ring 202a-3 fits with the inner wall of the nozzle 202 to seal the end of the liquid storage pipe 201. At this time, the external medium cannot enter the liquid storage pipe 201. When the piston rod 203 is pushed in the liquid storage pipe 201, the liquid medicine pushes the mounting member 202a-2. At this time, the sealing ring 202a-3 is separated from the inner wall of the nozzle 202, and the liquid medicine can pass through the first channel 202b and be sprayed out. When there is a passage in the mounting member 202a-2 for the two ends of the first channel 202b to communicate, when the mounting member 202a-2 is pressed and in contact with the inner wall of the nozzle 202, the first spring 202a-1 can be protected in the protection space. The liquid medicine enters the inside of the first channel 202b from the end of the liquid outlet pipe, and then passes through the passage in the mounting member 202a-2 and is sprayed out from the other end of the first channel 202b to complete the injection of the liquid medicine.

[0084] Further, a liquid storage cavity 201c and a liquid inlet cavity 201d communicating with the liquid storage cavity 201c are provided inside the liquid storage pipe 201; the spray head 202 communicates with the liquid storage cavity 201c, and the piston rod 203 is slidably disposed in the liquid storage cavity 201c.

[0085] The second one-way valve 201b includes a valve body 201b-1 disposed in the liquid inlet cavity 201d, the valve body 201b-1 is fixed inside the liquid inlet cavity 201d, a sealing surface 201b-2 disposed inside the valve body 201b-1, a magnetic bead 201b-3 slidably disposed inside the valve body 201b-1, and a limiting member 201b-4 disposed inside the valve body 201b-1. The magnetic bead 201b-3 slides between the limiting member 201b-4 and the sealing surface 201b-2, and the sliding distance d is 0.1 mm - 0.3 mm. When the magnetic bead 201b-3 contacts the sealing surface 201b-2, it can cut off the channel of the liquid inlet pipe 201a and prevent the liquid medicine from entering the liquid medicine tank.

[0086] Wherein the sealing surface 201b-2 inside the valve body 201b-1 is trumpet-shaped, the channel inside the valve body 201b-1 is divided into two by the sealing surface 201b-2. The inner diameter of the channel communicating with the liquid inlet pipe 201a is smaller than the inner diameter of the channel communicating with the liquid inlet cavity 201d. The magnetic bead 201b-3 is located inside the channel communicating with the liquid inlet cavity 201d. As Figure 10 , the limiting member 201b-4 includes a long rod, the long rod can be fixedly disposed in the liquid inlet cavity 201d and inserted on the valve body 201b-1 to cooperate with the magnetic bead 201b-3, or the long rod is directly fixed inside the valve body 201b-1 to cooperate with the magnetic bead 201b-3;

[0087] Or as Figure 11 , the limiting member 201b-4 is formed by the inner contraction of the channel of the valve body 201b-1 communicating with the liquid inlet cavity 201d. The inner-contracted channel of the valve body 201b-1 is not circular, which can limit the magnetic bead 201b-3 and there is also a gap between the magnetic bead 201b-3 for the liquid medicine to pass through.

[0088] During use, when the piston rod 203 moves for the liquid pumping operation, at this time, the movement of the piston rod 203 generates a suction force in the liquid storage cavity 201c. At this time, the sealing ring 202a-3 in the spray head 202 seals off the liquid storage cavity 201c from the external channel with the first channel 202b. The magnetic bead 201b-3 in the valve body 201b-1 contacts the limiting member 201b-4, and the suction force generated in the liquid storage cavity 201c can suck the liquid medicine in the liquid inlet pipe 201a into the liquid storage pipe 201;

[0089] When the piston rod 203 moves for liquid discharging operation, at this time, the movement of the piston rod 203 generates a thrust in the liquid storage cavity 201c. At this time, the magnetic bead 201b-3 is pushed by the liquid medicine to contact the sealing surface 201b-2, and the liquid medicine cannot pass through the valve body 201b-1 into the liquid inlet pipe 201a. At the same time, the liquid medicine in the liquid storage cavity 201c will lift the mounting member 202a-2 to open the connection between the liquid storage cavity 201c and the first channel 202b. The liquid medicine is squeezed by the piston rod 203 and sprayed out from the end of the first channel 202b to complete the liquid medicine injection.

[0090] The remaining structures are the same as those in Embodiment 1.

[0091] Embodiment 3, refer to Figures 12-14 , which is the third embodiment of the present invention. The difference between this embodiment and the second embodiment is that a positioning portion 306 is provided on the turntable 302;

[0092] The positioning portion 306 includes a first position sensor 306a provided on the mounting shell 101 and a sensor trigger block 306b provided on the turntable 302; The first position sensor 306a can be installed on the mounting block 101a.

[0093] When the first position sensor 306a contacts the sensor trigger block 306b, the control portion 303 moves the push rod 304 to the end of the stroke. When the control portion 303 moves the push rod 304 to the end of the stroke, the push rod 304 controls the piston rod 203 to perform liquid suction operation, and the liquid storage cavity 201c is filled with liquid medicine. At this time, the first position sensor 306a contacts the sensor trigger block 306b, and the first position sensor 306a works to remind that the liquid medicine is fully sucked, and the liquid suction operation is stopped.

[0094] The driving unit 300 further includes a trigger assembly 307; The trigger assembly 307 includes a trigger sleeve 307a slidably sleeved outside the nozzle 202, a second spring 307b provided between the trigger sleeve 307a and the liquid storage tube 201, and a second position sensor 307c provided on the liquid storage tube 201 and cooperating with the trigger sleeve 307a; The second spring 307b controls the trigger sleeve 307a to be away from the second position sensor 307c. When performing liquid discharging injection after the liquid suction operation is completed, the nozzle 202 is contacted with the skin. At this time, the trigger sleeve 307a is squeezed to contact the second position sensor 307c. When the second position sensor 307c is triggered to work, it can be determined that the nozzle 202 is in contact with the injection skin, and at this time, liquid discharging injection can be performed.

[0095] Furthermore, it further includes a control unit 400; The control unit 400 includes a control main board 401 and a battery 403 provided inside the mounting shell 101, and a display 402 provided outside the mounting shell 101;

[0096] The first position sensor 306a, the second position sensor 307c, and the display 402 are electrically connected to the control main board 401;

[0097] The battery 403 is electrically connected to the drive motor 301 and the control main board 401.

[0098] After receiving the signal, the control main board 401 can control the drive motor 301 to work. The injection and cleaning functions are displayed on the display 402, and the corresponding function is selected by controlling the limiter. When the injection function is selected, the control main board 401 controls the drive motor 301 to rotate forward to pump liquid. When in the liquid pumping process, when the first position sensor 306a contacts the sensor trigger block 306b, the liquid medicine suction is completed at this time. The first position sensor 306a sends out a signal to the control main board 401, and the control main board 401 controls the drive motor 301 to stop working;

[0099] After that, the nozzle 202 is brought into contact with the skin, so that the trigger sleeve 307a is squeezed to contact the second position sensor 307c. At this time, the second position sensor 307c sends out a signal to the control main board 401, and the control main board 401 controls the drive motor 301 to continue rotating forward to complete the injection operation of discharging the liquid medicine.

[0100] When the cleaning function is selected, the control main board 401 controls the drive motor 301 to rotate forward to pump liquid. When in the liquid pumping process, when the first position sensor 306a contacts the sensor trigger block 306b, the liquid medicine suction is completed at this time. The first position sensor 306a sends out a signal to the control main board 401, and the control main board 401 controls the drive motor 301 to rotate in the reverse direction. The piston rod 203 is uniformly pushed to discharge the liquid medicine and air inside the liquid storage cavity 201c to complete the cleaning function.

[0101] A locking piece 307d is slidably inserted between the trigger sleeve 307a and the liquid storage tube 201. The locking piece 307d can prevent the trigger sleeve 307a from contacting the second position sensor 307c, thereby ensuring that the drive motor 301 will not be accidentally triggered to act when not injecting.

[0102] The remaining structures are the same as those of Embodiment 2.

[0103] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A needle-free syringe, characterized in that: include, The installation unit (100) comprises an installation shell (101) and a receiving space (102) arranged inside the installation shell (101); An injection unit (200) comprises a liquid storage tube (201) arranged in the accommodating space (102), a nozzle (202) arranged at the end of the liquid storage tube (201), and a piston rod (203) slidably arranged in the liquid storage tube (201); as well as, A driving unit (300) comprising a driving motor (301) arranged in the accommodating space (102), a rotating disk (302) arranged at the end of the driving motor (301), a control unit (303) arranged on the rotating disk (302), a push rod (304) slidably arranged on the mounting shell (101), and an elastic member (305) arranged between the push rod (304) and the mounting shell (101); One end of the push rod (304) cooperates with the control part (303), and the other end cooperates with the piston rod (203), and the push rod (304) and the piston rod (203) can be relatively displaced; The control unit (303) moves the push rod (304) to cause the elastic member (305) to deform, and at the same time, the push rod (304) moves and moves synchronously after contacting the piston rod (203). When the elastic member (305) returns to its original state, the push rod (304) is controlled to move synchronously after colliding with the piston rod (203).

2. The needle-free injector according to claim 1, characterized in that: There is a sliding space (M) between the push rod (304) and the piston rod (203), and the push rod (304) and the piston rod (203) are in contact with each other to limit position.

3. The needle-free injector according to claim 1 or 2, characterized in that: The relative displacement distance (a) of the piston rod (203) and the push rod (304) is 1 cm to 8 cm.

4. The needle-free injector according to claim 1, characterized in that: The spray head (202) is provided with a first one-way valve (202a); The liquid storage tube (201) is connected to a liquid inlet tube (201a), and a second one-way valve (201b) is provided between the liquid inlet tube (201a) and the liquid storage tube (201).

5. The needle-free injector according to any one of claims 1, 2 and 4, characterized in that: The control unit (303) comprises an initial surface (303a) arranged on the rotating disk (302), and a climbing surface (303b) connected to the initial surface (303a); One end of the climbing surface (303b) is in contact with the initial surface (303a), and the other end of the climbing surface (303b) is perpendicular to the height projection of the initial surface (303a); The push rod (304) is provided with a sliding member (304a), and the sliding member (304a) cooperates with the initial surface (303a) and the climbing surface (303b).

6. The needle-free injector according to claim 1 or 4, characterized in that: A first channel (202b) is provided inside the nozzle (202), one end of the first channel (202b) is connected to the liquid storage tube (201), and the other end of the first channel (202b) is circular with an inner diameter of 0.15 mm-0.3 mm.

7. The needle-free injector according to claim 4, characterized in that: The liquid storage tube (201) is provided with a liquid storage cavity (201c) and a liquid inlet cavity (201d) connected to the liquid storage cavity (201c); The spray head (202) is in communication with the liquid storage chamber (201c), and the piston rod (203) is slidably disposed in the liquid storage chamber (201c); The second one-way valve (201b) comprises a valve body (201b-1) arranged in the liquid inlet cavity (201d), a sealing surface (201b-2) arranged inside the valve body (201b-1), a magnetic bead (201b-3) slidably arranged inside the valve body (201b-1), and a limiter (201b-4) arranged inside the valve body (201b-1); The magnetic bead (201b-3) slides between the limiting component (201b-4) and the sealing surface (201b-2), and the sliding distance (d) is 0.1 mm-0.3 mm.

8. The needle-free injector according to claim 4 or 7, characterized in that: A first channel (202b) is provided inside the nozzle (202); The first one-way valve (202a) comprises a first spring (202a-1) arranged inside the first channel (202b), a mounting member (202a-2) arranged at the end of the first spring (202a-1), and a sealing ring (202a-3) arranged between the mounting member (202a-2) and the first channel (202b); The sealing ring (202a-3) is close to the liquid storage tube (201).

9. The needle-free injector according to claim 5, characterized in that: A mounting block (101a) is provided inside the mounting shell (101); The push rod (304) is slidably disposed on the mounting block (101a); The driving motor (301) is fixedly mounted on the mounting block (101a); One end of the elastic member (305) is connected to the push rod (304), and the other end is connected to the mounting block (101a).

10. The needle-free injector according to any one of claims 1, 2, 4, 7, and 9, characterized in that: The rotating disk (302) is provided with a positioning portion (306); The positioning portion (306) comprises a first position sensor (306a) arranged on the mounting shell (101), and a sensor trigger block (306b) arranged on the rotating disk (302); When the first position sensor (306a) contacts the sensor trigger block (306b), the control unit (303) moves the push rod (304) to the end of the stroke.

11. The needle-free injector according to claim 10, characterized in that: The driving unit (300) further comprises a trigger component (307); The trigger assembly (307) comprises a trigger sleeve (307a) slidably sleeved on the outside of the spray head (202), a second spring (307b) arranged between the trigger sleeve (307a) and the liquid storage tube (201), and a second position sensor (307c) arranged on the liquid storage tube (201) and cooperating with the trigger sleeve (307a).

12. The needle-free injector according to claim 11, characterized in that: A locking piece (307d) is slidably inserted between the trigger sleeve (307a) and the liquid storage tube (201).

13. The needle-free injector according to claim 11 or 12, characterized in that: It also includes a control unit (400); the control unit (400) includes a control mainboard (401) and a battery (402) arranged inside the installation shell (101), and a display (403) arranged outside the installation shell (101); The first position sensor (306a), the second position sensor (307c) and the display (403) are electrically connected to the control main board (401); The battery (402) is electrically connected to the drive motor (301) and the control main board (401).

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