Needleless injector

Abstract

The present application relates to the technical field of syringes, in particular to a needleless syringe, comprising a mounting unit, including a mounting shell, a containing space arranged in the mounting shell; a injection unit, including a liquid storage tube arranged in the containing space, a piston rod slidingly arranged in the liquid storage tube; a driving unit, including a driving motor arranged in the containing space, a rotating disc arranged at the end of the driving motor, a push rod slidingly arranged on the mounting shell, the push rod being capable of relative displacement with the piston rod. The needleless syringe can control the reciprocating movement of the push rod through the cooperation of the control part and the elastic element, thereby controlling the reciprocating movement of the piston rod, realizing the suction and discharge of the liquid medicine in the liquid storage tube, wherein the elastic element will collide with the piston rod when controlling the movement of the push rod, increasing the pressure of the liquid medicine discharge of the liquid storage tube, facilitating the skin piercing, and the moving speed is reduced after the collision, the liquid medicine ejection pressure is reduced, facilitating the liquid medicine injection.

Description

Technical Field

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

[0002] Needle-free injectors mainly utilize the principle of pressure jet. The internal pressure device generates pressure, which pushes the liquid in the tube through micropores to form an extremely fine liquid column. This allows the liquid to penetrate the epidermis and reach the subcutaneous layer instantly. The liquid is then absorbed in a diffused manner with a diameter of 3-5 cm under the skin.

[0003] The needle-free injector includes a drug reservoir. The drug reservoir pushes out the internal liquid through the movement of a piston to complete the injection. The piston moves back and forth at a constant speed under the control of a motor. The liquid aspiration and dispensing cycles are carried out. There are no requirements for the movement of the piston during liquid aspiration. Currently, during dispensing, the constant speed of the piston makes the pressure of the liquid sprayed from the drug reservoir 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 needleless injectors, the present invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a needle-free injector that is easy to pierce the epidermis and easy to inject.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a needle-free injector, comprising,

[0007] The mounting unit includes a mounting housing and an accommodating space disposed inside the mounting housing;

[0008] The injection unit includes a liquid reservoir disposed in the accommodating space, a nozzle disposed at the end of the liquid reservoir, and a piston rod slidably disposed in the liquid reservoir; and,

[0009] The drive unit includes a drive motor disposed in the accommodating space, a turntable disposed at the end of the drive motor, a control unit disposed on the turntable, a push rod slidably disposed on the mounting housing, and an elastic member disposed between the push rod and the mounting housing;

[0010] One end of the push rod engages with the control unit, and the other end engages with the piston rod, allowing the push rod and the piston rod to undergo relative displacement.

[0011] The control unit moves the push rod to cause the elastic element to deform, and at the same time, the push rod moves synchronously after contacting the piston rod. When the elastic element returns to its original shape, the control unit controls the push rod to collide with the piston rod and move synchronously.

[0012] In 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 with each other for limiting.

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

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

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

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

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

[0018] The push rod is equipped with a slider, which cooperates with the initial surface and the climbing surface.

[0019] As a preferred embodiment of the needleless injector of the present invention, the nozzle has a first channel inside, 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 0.15mm-0.3mm.

[0020] As a preferred embodiment of the needleless injector of the present invention, the liquid storage tube is provided with a liquid storage chamber and an inlet chamber communicating with the liquid storage chamber;

[0021] The nozzle is connected to the liquid storage chamber, and the piston rod is slidably disposed in the liquid storage chamber;

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

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

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

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

[0026] The sealing ring is located near the liquid storage tube.

[0027] As a preferred embodiment of the needleless injector of the present invention, the mounting shell is provided with a mounting block inside;

[0028] The push rod is slidably mounted on the mounting block;

[0029] The drive motor is fixedly mounted on the mounting block;

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

[0031] In a preferred embodiment of the needleless injector of the present invention, the turntable is provided with a positioning part;

[0032] The positioning part includes a first position sensor disposed on the mounting housing and a sensor trigger block disposed on the turntable;

[0033] When the first position sensor comes into contact with the sensor trigger block, the control unit moves the push rod to the end of its stroke.

[0034] In a preferred embodiment of the needleless injector of the present invention, the driving unit further includes a triggering component;

[0035] The triggering assembly includes a trigger sleeve that is slidably fitted onto the outside of 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] In a preferred embodiment of the needleless injector of the present invention, a locking piece is slidably inserted between the trigger sleeve and the liquid reservoir tube.

[0037] As a preferred embodiment of the needleless injector of the present invention, it further includes a control unit; the control unit includes a control motherboard and a battery disposed inside the mounting housing, and a display disposed outside the mounting housing;

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

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

[0040] The beneficial effects of the present invention are as follows: the reciprocating movement of the push rod can be controlled by the cooperation of the control unit and the elastic element, thereby controlling the reciprocating movement of the piston rod, realizing the suction and discharge of the medicine inside the reservoir tube. When the elastic element controls the push rod to move, it will collide with the piston rod, increasing the pressure of the medicine discharged from the reservoir tube, making it easier to puncture the skin. At the same time, the movement speed is reduced after the collision, and the pressure of the medicine sprayed out is reduced, which facilitates the injection of the medicine. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the needle-free injector is shown.

[0043] Figure 2 A schematic diagram of the first morphology of the sliding space for needle-free injection is shown.

[0044] Figure 3 A schematic diagram of the second form of the sliding space for needle-free injection is shown;

[0045] Figure 4 A schematic diagram of the third form of the sliding space for needle-free injection is shown;

[0046] Figure 5 A schematic diagram of the fourth form of the sliding space for needle-free injection is shown;

[0047] Figure 6 The first embodiment of the control unit for needle-free injection is shown.

[0048] Figure 7 A schematic diagram of the second form of the control unit for needle-free injection is shown;

[0049] Figure 8 A top view of the second configuration of the needle-free injection control unit is shown;

[0050] Figure 9 A schematic diagram of the third form of the control unit for needle-free injection is shown;

[0051] Figure 10 A schematic diagram of the reservoir tube for needle-free injection is shown;

[0052] Figure 11 A schematic diagram of the second form of the limiting component for needle-free injection is shown;

[0053] Figure 12 A schematic diagram of the positioning part for needle-free injection is shown;

[0054] Figure 13 A schematic diagram of the triggering component for needle-free injection is shown;

[0055] Figure 14 A schematic diagram of the control unit for needle-free injection is shown. Detailed Implementation

[0056] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0057] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0058] Example 1, referring to Figures 1-9 The first embodiment of the present invention provides a needleless injector, which includes an installation unit 100, an injection unit 200, and a drive unit 300.

[0059] The mounting unit 100 includes a mounting shell 101, which has an accommodating space 102 inside. The mounting shell 101 is cylindrical like a syringe or gun-shaped with a handle.

[0060] The injection unit 200 includes a liquid storage tube 201 disposed in the accommodating space 102, a nozzle 202 disposed at the end of the liquid storage tube 201, and a piston rod 203 slidably disposed in the liquid storage tube 201. The liquid storage tube 201 is partially located in the accommodating space 102 and the remaining part is located in the external space. The nozzle 202 is installed at the end of the liquid storage tube 201 in the external space. The suction and discharge of the liquid 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, the nozzle 202 has a first channel 202b inside. 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 0.15mm-0.3mm. The piston rod 203 squeezes the liquid inside the liquid storage tube 201 and sprays it 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 and the piston rod 203 can be moved to draw the liquid from the first channel 202b into the liquid storage tube 201 for subsequent injection.

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

[0063] Furthermore, the mounting housing 101 has a mounting block 101a inside; the push rod 304 is slidably mounted on the mounting block 101a; the drive motor 301 is fixedly mounted on the mounting block 101a; one end of the elastic element 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, and the push rod 304 and the piston rod 203 can undergo relative displacement, and a round tube extends from the mounting housing 101 and is sleeved on the push rod 304, and one end of the extended round 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 with each other for limiting.

[0065] like Figure 2 When the sliding space M is set 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 its stroke in the sliding space M, it will contact the push rod 304 and thus be restricted from moving. The range of movement of the piston rod 203 is the distance a of relative displacement between the piston rod 203 and the push rod 304.

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

[0067] like Figure 4 The sliding space M is formed by a recessed groove on the side of the push rod 304 or piston rod 203, or 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 as... Figure 5 The sliding space M is formed by a groove in the side wall of the recessed circular groove at the end of the push rod 304 or piston rod 203. The end of the push rod 304 or piston rod 203 inserted into the sliding space M has a protrusion that contacts and limits the inner wall of the sliding space M.

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

[0069] The control unit 303 includes an initial surface 303a disposed on the turntable 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 climbing surface 303b is divided into a high end and a low end, the low end of the climbing surface 303b is in contact with 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] The push rod 304 is provided with a slider 304a, which cooperates with the initial surface 303a and the climbing surface 303b. The bottom end is in contact with the initial surface 303a at an angle greater than 120°, which facilitates the slider 304a to slide from the initial surface 303a to the climbing surface 303b. When the slider 304a moves to the upper end on the climbing surface 303b, the push rod 304 is pushed and moves, compressing the elastic element 305. When the slider 304a leaves the upper 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 element 305.

[0071] The drive motor 301 controls the turntable 302 to rotate, thereby causing the control unit 303 to slide relative to the sliding member 304a. 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 push rod 304 moves to compress the elastic member 305. When it moves to the end of the stroke in the sliding space M, it will pull the piston rod 203 to move and perform a suction operation on the liquid storage tube 201. At this time, the liquid medicine can be drawn into the liquid storage tube 201.

[0072] When the slider 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 element 305 and come into contact with the initial surface 303a. At this time, the push rod 304 will accelerate in the sliding space M under the elastic force of the elastic element 305 and move to the end of the stroke. It will then collide with the piston rod 203 and pressurize the liquid in the reservoir tube 201 to spray out. After the collision, the speed decreases and pushes the piston rod 203 to discharge the end of the liquid. The collision increases the pressure of the liquid discharged from the reservoir tube 201, making it easier to pierce the skin. At the same time, the movement speed decreases after the collision, and the liquid spraying pressure decreases, making it easier for the liquid to be injected into the body.

[0073] Furthermore, such as Figure 6 The initial surface 303a is set on the end face of the turntable 302, and the climbing surface 303b is made of an arc plate installed on the end face of the turntable 302. The surface of the arc plate is the climbing surface 303b. The bottom of the sliding member 304a is provided with a slot, which slides and engages with the initial surface 303a and the climbing surface 303b through the slot.

[0074] Or such as Figure 7 and Figure 8 The initial surface 303a is set on the side of the turntable 302, and the climbing surface 303b is made of a triangular block installed on the side of the turntable 302. One side of the triangular block is arc-shaped, and the arc-shaped side is the climbing surface 303b. The bottom of the sliding member 304a is provided with a slot, which slides and engages with the initial surface 303a and the climbing surface 303b through the slot.

[0075] Or, for example Figure 9 The turntable 302 has a spiral groove on its side. The spiral groove spirals for one turn and the two ends of the spiral groove are connected by a connecting groove. The lower 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 cylinder in the spiral groove for sliding engagement.

[0076] The process includes: liquid extraction, the nozzle 202 contacting the liquid, the drive motor 301 controlling the turntable 302 to rotate in the forward direction, the sliding member 304a sliding 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 it can pull the piston rod 203 to draw the liquid into the storage tube 201;

[0077] Drainage: When the nozzle 202 comes into contact with the skin, the drive motor 301 controls the turntable 302 to rotate in the forward direction. 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 come into contact with the initial surface 303a. At this time, the push rod 304 accelerates in the sliding space M under the elastic force of the elastic member 305 and moves to the end of the stroke. It will then collide with the piston rod 203 to pressurize and spray out the medicine in the reservoir tube 201.

[0078] During the initial injection, the nozzle 202 contacts the liquid, and the drive 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 of the climbing surface 303b, the liquid is drawn into the storage tube 201. Then, the drive 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, the push rod 304, under the elastic force of the reset member, can push the piston rod 203 at a uniform speed to discharge the liquid and air from the storage tube 201, thus achieving cleaning and air removal.

[0079] Example 2, refer to Figure 10 and Figure 11This is the second embodiment of the present invention, which differs from the first embodiment in that: a first one-way valve 202a is provided in the nozzle 202; an inlet pipe 201a is connected to the liquid storage pipe 201, and a second one-way valve 201b is provided between the inlet pipe 201a and the liquid storage pipe 201. The first one-way valve 202a allows the liquid in the liquid storage pipe 201 to pass through the nozzle 202 in one direction and be discharged, and the external medium of the nozzle 202 cannot pass through the nozzle 202 in the reverse direction to enter the liquid storage pipe 201. The inlet pipe 201a is connected to the liquid tank, and the second one-way valve 201b allows the liquid in the liquid tank to pass through the inlet pipe 201a in one direction to enter the liquid storage pipe 201, and the liquid in the liquid storage pipe 201 cannot pass through the 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 tube 201. One end of the first channel 202b is connected to the liquid storage tube 201, and the other end is connected to the outside. The sealing ring 202a-3 is located in contact with the inner wall of the nozzle 202 that forms the first channel 202b, thereby sealing the end of the liquid storage tube 201.

[0082] Furthermore, the mounting component 202a-2 can be made of a cylinder or a round bottom with a support column, preferably a cylinder, with a protective space 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 in the nozzle 202 housing or sleeved on the surface of the cylinder. The surface of the cylinder is provided with a groove for the sealing ring 202a-3 to be sleeved.

[0083] In the initial state, the first spring 202a-1 compresses the mounting piece 202a-2, causing the sealing ring 202a-3 to adhere to the inner wall of the nozzle 202, sealing the end of the liquid storage tube 201. At this time, external media cannot enter the liquid storage tube 201. When the piston rod 203 pushes in the liquid storage tube 201, the liquid pushes the mounting piece 202a-2. At this time, the sealing ring 202a-3 separates from the inner wall of the nozzle 202, and the liquid can pass through the first channel 202b and be sprayed out. When the mounting piece 202a-2 is provided with a passage for the two ends of the first channel 202b to communicate, when the mounting piece 202a-2 is compressed and contacts the inner wall of the nozzle 202, the first spring 202a-1 can be protected in the protective space. The liquid enters the interior of the first channel 202b from the end of the outlet tube, and then passes through the passage in the mounting piece 202a-2 and is sprayed out from the other end of the first channel 202b, completing the liquid injection.

[0084] Furthermore, the liquid storage tube 201 is provided with a liquid storage chamber 201c and an inlet chamber 201d that communicates with the liquid storage chamber 201c; the nozzle 202 communicates with the liquid storage chamber 201c, and the piston rod 203 is slidably disposed in the liquid storage chamber 201c.

[0085] The second one-way valve 201b includes a valve body 201b-1 disposed in the inlet chamber 201d, the valve body 201b-1 being fixed inside the inlet chamber 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 0.1mm-0.3mm. When the magnetic bead 201b-3 contacts the sealing surface 201b-2, it can isolate the inlet pipe 201a channel, preventing the medicine from entering the medicine tank.

[0086] The sealing surface 201b-2 inside the valve body 201b-1 is funnel-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 chamber 201d. The magnetic bead 201b-3 is located inside the channel communicating with the liquid inlet chamber 201d. Figure 10 The limiting component 201b-4 includes a long rod, which can be fixedly installed in the liquid inlet chamber 201d and inserted into the valve body 201b-1 to cooperate with the magnetic bead 201b-3, or the long rod can be directly fixed inside the valve body 201b-1 to cooperate with the magnetic bead 201b-3.

[0087] Or such as Figure 11 The limiting member 201b-4 is formed by the inward retraction of the channel connecting the valve body 201b-1 and the liquid inlet chamber 201d. The channel of the inward retraction valve body 201b-1 is not circular. It can limit the magnetic bead 201b-3 and also has a gap with the magnetic bead 201b-3 to allow the liquid to pass through.

[0088] During use, when the piston rod 203 moves to perform the liquid extraction operation, the piston rod 203 generates suction in the liquid storage chamber 201c. At this time, the sealing ring 202a-3 in the nozzle 202 seals and isolates the liquid storage chamber 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. The suction generated in the liquid storage chamber 201c can draw the liquid in the inlet pipe 201a into the liquid storage pipe 201.

[0089] When the piston rod 203 moves to perform the drainage operation, it generates thrust in the storage chamber 201c. At this time, the magnetic bead 201b-3 is pushed by the liquid to contact the sealing surface 201b-2, preventing the liquid from passing through the valve body 201b-1 into the inlet pipe 201a. Simultaneously, the liquid in the storage chamber 201c pushes up the mounting part 202a-2 to open the connection between the storage chamber 201c and the first channel 202b. The liquid is then squeezed by the piston rod 203 and sprayed out from the end of the first channel 202b, completing the liquid injection.

[0090] The remaining structure is the same as that in Example 1.

[0091] Example 3, referring to Figures 12-14 This is the third embodiment of the present invention, which differs from the second embodiment in that: the turntable 302 is provided with a positioning part 306;

[0092] The positioning unit 306 includes a first position sensor 306a disposed on the mounting housing 101 and a sensor trigger block 306b disposed on the turntable 302; the first position sensor 306a can be mounted on the mounting block 101a.

[0093] 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 its stroke. When the control unit 303 moves the push rod 304 to the end of its stroke, the push rod 304 controls the piston rod 203 to perform liquid extraction, and the liquid storage chamber 201c is filled with liquid. At this time, the first position sensor 306a contacts the sensor trigger block 306b, the first position sensor 306a is activated, indicating that the liquid is full and the liquid extraction operation is stopped.

[0094] The drive unit 300 also includes a trigger assembly 307; the trigger assembly 307 includes a trigger sleeve 307a that is slidably sleeved on the outside of the nozzle 202, a second spring 307b disposed between the trigger sleeve 307a and the liquid storage tube 201, and a second position sensor 307c disposed on the liquid storage tube 201 and cooperating with the trigger sleeve 307a; the second spring 307b controls the trigger sleeve 307a to move away from the second position sensor 307c. When the liquid aspiration operation is completed and the drainage injection is performed, the nozzle 202 is brought into contact with the skin. At this time, the trigger sleeve 307a is squeezed and comes into contact with 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 the drainage injection can be performed at this time.

[0095] Furthermore, it also includes a control unit 400; the control unit 400 includes a control motherboard 401 and a battery 403 disposed inside the mounting housing 101, and a display 402 disposed outside the mounting housing 101.

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

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

[0098] After receiving a signal, the control motherboard 401 can control the drive motor 301 to work. The display 402 shows the injection and cleaning functions. The corresponding function is selected by controlling the limit switch. When the injection function is selected, the control motherboard 401 controls the drive motor 301 to rotate forward to draw liquid. When the first position sensor 306a contacts the sensor trigger block 306b during the liquid drawing process, the liquid drawing is completed. The first position sensor 306a sends a signal to the control motherboard 401, and the control motherboard 401 controls the drive motor 301 to stop working.

[0099] Then, the nozzle 202 is brought into contact with the skin, causing the trigger sleeve 307a to be squeezed and come into contact with the second position sensor 307c. At this time, the second position sensor 307c sends a signal to the control motherboard 401, and the control motherboard 401 controls the drive motor 301 to continue rotating in the forward direction to complete the injection of the medicine.

[0100] When the cleaning function is selected, the control motherboard 401 controls the drive motor 301 to rotate forward to draw liquid. During the liquid drawing process, when the first position sensor 306a contacts the sensor trigger block 306b, the liquid drawing is completed. The first position sensor 306a sends a signal to the control motherboard 401, and the control motherboard 401 controls the drive motor 301 to rotate in the reverse direction. The piston rod 203 is pushed at a constant speed to discharge the liquid and air inside the liquid storage chamber 201c, thus completing 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 activated when not injecting.

[0102] The remaining structure is the same as that in Example 2.

[0103] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A needle-free injector, characterized in that: include, The mounting unit (100) includes a mounting housing (101) and an accommodating space (102) disposed inside the mounting housing (101). The injection unit (200) includes a liquid reservoir (201) disposed in the accommodating space (102), a nozzle (202) disposed at the end of the liquid reservoir (201), and a piston rod (203) slidably disposed in the liquid reservoir (201); and, The drive unit (300) includes a drive motor (301) disposed in the accommodating space (102), a turntable (302) disposed at the end of the drive 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). One end of the push rod (304) is engaged with the control unit (303), and the other end is engaged with the piston rod (203). The push rod (304) and the piston rod (203) can undergo relative displacement. The control unit (303) moves the push rod (304) to cause the elastic element (305) to deform. At the same time, the push rod (304) moves and contacts the piston rod (203) and moves synchronously. When the elastic element (305) returns to its original state, the control unit controls the push rod (304) to collide with the piston rod (203) and move synchronously. 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 and are limited in position; When the sliding space (M) is set 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 its stroke in the sliding space (M), it will contact the push rod (304) and thus be restricted from moving. The range of movement of the piston rod (203) is the distance (a) of the relative displacement between the piston rod (203) and the push rod (304). Alternatively, when the sliding space (M) is set 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 its stroke in the sliding space (M), it will contact the piston rod (203) and thus be restricted from moving. The range of movement of the push rod (304) is the distance (a) of the relative displacement between the piston rod (203) and the push rod (304). Alternatively, the sliding space (M) is formed by a recessed groove on the side of the push rod (304) or piston rod (203), the sliding space (M) is formed by a recessed convex annular groove at the end of the push rod (304) or piston rod (203), and the sliding space (M) is formed by a recessed groove on the side wall of the recessed circular groove at the end of the push rod (304) or piston rod (203). The end of the push rod (304) or piston rod (203) inserted into the sliding space (M) is provided with a protrusion that contacts and limits the inner wall of the sliding space (M). The control unit (303) includes an initial surface (303a) disposed on the turntable (302) and a climbing surface (303b) connected to the initial surface (303a); the push rod (304) is provided with a sliding member (304a), which cooperates with the initial surface (303a) and the climbing surface (303b); The initial surface (303a) is set on the side of the turntable (302), and the climbing surface (303b) is made of a triangular block installed on the side of the turntable (302). One side of the triangular block is arc-shaped, and the arc-shaped side is the climbing surface (303b). The bottom of the sliding member (304a) is provided with a slot, which slides and engages with the initial surface (303a) and the climbing surface (303b) through the slot.

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

3. The needleless injector according to claim 1, characterized in that: The nozzle (202) is provided with a first check valve (202a); The liquid storage tube (201) is connected to an inlet tube (201a), and a second one-way valve (201b) is provided between the inlet tube (201a) and the liquid storage tube (201).

4. The needleless injector according to claim 1 or 3, characterized in that: The nozzle (202) has a first channel (202b) inside. 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 0.15mm-0.3mm.

5. The needleless injector according to claim 3, characterized in that: The liquid storage tube (201) is provided with a liquid storage chamber (201c) inside, and a liquid inlet chamber (201d) communicating with the liquid storage chamber (201c). The nozzle (202) is connected to 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) includes a valve body (201b-1) disposed in the liquid inlet chamber (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 0.1mm-0.3mm.

6. The needleless injector according to claim 5, characterized in that: The nozzle (202) has a first channel (202b) inside. 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). The sealing ring (202a-3) is located near the liquid storage tube (201).

7. The needleless injector according to claim 4, characterized in that: The mounting housing (101) has a mounting block (101a) inside. The push rod (304) is slidably disposed on the mounting block (101a); The drive motor (301) is fixedly mounted on the mounting block (101a); One end of the elastic element (305) is connected to the push rod (304), and the other end is connected to the mounting block (101a).

8. The needleless injector according to any one of claims 1, 2, and 5, characterized in that: The turntable (302) is provided with a positioning part (306). The positioning part (306) includes a first position sensor (306a) disposed on the mounting housing (101) and a sensor trigger block (306b) disposed on the turntable (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 its stroke.

9. The needleless injector according to claim 8, characterized in that: The drive unit (300) also includes a trigger component (307); The triggering assembly (307) includes a trigger sleeve (307a) that is slidably sleeved on the outside of the nozzle (202), a second spring (307b) disposed between the trigger sleeve (307a) and the liquid storage tube (201), and a second position sensor (307c) disposed on the liquid storage tube (201) and cooperating with the trigger sleeve (307a).

10. The needleless injector according to claim 9, characterized in that: A locking piece (307d) is slidably inserted between the trigger sleeve (307a) and the liquid storage tube (201).

11. The needleless injector according to claim 9 or 10, characterized in that: It also includes a control unit (400); the control unit (400) includes a control motherboard (401) and a battery (402) disposed inside the mounting housing (101), and a display (403) disposed outside the mounting housing (101). The first position sensor (306a), the second position sensor (307c), and the display (403) are electrically connected to the control motherboard (401); The battery (402) is electrically connected to the drive motor (301) and the control motherboard (401).

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