Electric needleless injector

Abstract

The utility model discloses an electric needleless injector, and belongs to the technical field of medical instruments, the electric needleless injector comprises a cylinder body and an ampoule part, the ampoule part comprises an ampoule outer sleeve and a piston push rod sleeved in the ampoule outer sleeve; the electromagnetic power part is used for pushing the piston push rod to move towards the liquid outlet of the ampoule outer sleeve, the dosage adjusting part is used for adjusting dosage, the dosage adjusting part and the electromagnetic power part are sequentially arranged in the cylinder body, and the ampoule outer sleeve is installed at one end of the cylinder body. The medicine bottle connecting device has the beneficial effects that the piston drawing piece axially slides in the medicine bottle connecting main body along the medicine bottle connecting main body by rotating the dosage adjusting button; furthermore, the piston push rod connected with the piston drawing piece is driven by the piston drawing piece to move back and forth in the axial direction of the ampoule outer sleeve, so that the ampoule part sucks and injects the medicine, the operation principle is simple, the number of parts of the whole machine is small, the manufacturing cost is low, and manual reset is not needed.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to an electric needleless syringe. Background Art

[0002] Traditional injection administration methods cause local skin damage and bleeding. Not only is the pain significant, which causes psychological fear in most patients, especially children, but there is also a risk of injection site infection. Long-term injections can also cause damage to subcutaneous tissues, nerves, and microvessels. Moreover, a large number of disposable syringes become medical waste threatening environmental health after use. Disposing of this medical waste is very inconvenient and costly. During the injection process, accidental needle breakage accidents are likely to occur, and accidental stabbing of patients or medical staff is likely to occur during operation. Needleless syringes can not only perfectly solve the defects of traditional needle syringes, but are also very suitable for mass injection of preventive drugs for the public during large-scale prevention of epidemic disease outbreaks.

[0003] Needleless injection technology refers to a technology in which, when injecting drugs, needles are not used, but instead, liquid drugs are pressurized so that the liquid drugs directly enter the body tissue in a way of ultra-fine, high-speed, and straight spraying; needleless syringes can make the injected drugs more dispersed, which is beneficial to drug absorption and reduces the invasion of subcutaneous tissues. It has many advantages such as reducing the pain and fear of drug injection, reducing the risk of bacterial infection, avoiding accidents such as needle scratches and breakage, fast drug absorption, no subcutaneous induration after long-term use, and high injection efficiency.

[0004] There are already many models of needleless syringes on the market today. Although needleless syringes have many advantages, after so many years of market tests, they still cannot be widely accepted by the market. Currently, most needleless syringes use a separate loader to provide power for the syringe, or the loader is integrated into the syringe and manually pressurized to provide power for the syringe. Both solutions are large in volume and inconvenient to carry, and require the user to use external force to provide power for the syringe. The operation steps are numerous and have certain technical and strength requirements for the operator, which limits their use; in addition, there are many accessories and the process is complex, resulting in high costs.

[0005] Some patents of needleless syringes are disclosed in the prior art. The invention patent with the publication number of CN101607103 discloses a magnetostrictive displacement type needleless syringe, which includes a cylinder body. In the upper section inside the cylinder body, there is a micro-displacement system composed of an electromagnetic coil and a magnetic rod. In the middle section, there is a displacement amplification system. In the lower section, there is a cartridge for loading liquid medicine, and the lower end of the outlet of the cartridge can also be connected to a contact part with a plurality of micro-protrusions for piercing the cutin layer. Under the action of an externally applied current, a magnetic field is generated along the axial direction of the coil. Under the action of this magnetic field, the magnetic rod generates radial magnetostrictive strain, generating a micro-displacement. After being amplified by the connected displacement amplification system, it pushes the piston of the connected cartridge to displace, and the medicine is extruded from the cylinder body at a high speed and injected subcutaneously. Although it solves the problems that the syringe cannot perform needleless injection of small molecule compound drug preparations and combine with a micro-protrusion contact device to achieve needleless injection of macromolecular drug preparations such as proteins, and the operation is cumbersome and the performance is unstable, etc., there are still problems in fact, such as the complex structure of the needleless syringe, high manufacturing cost, large volume, cumbersome operation, inconvenient use and carrying, etc.

[0006] In view of this, the inventor of the present invention conducted in-depth research on the need for an electric needleless syringe that does not require manual power supply for the syringe, and has the advantages of simple structure, small volume, simple operation, convenient use and carrying, and low manufacturing cost, and thus this case was born. Summary of the Invention

[0007] To overcome the problems of high manufacturing cost, large volume, cumbersome operation, inconvenient use and carrying of needleless syringes in the prior art, the present invention provides an electric needleless syringe, which includes a cylinder body and an ampoule part. The ampoule part includes an ampoule outer sleeve and a piston push rod sleeved inside the ampoule outer sleeve.

[0008] It also includes an electromagnetic power part for pushing the piston push rod to move towards the liquid discharge port of the ampoule outer sleeve and a dose adjustment part for dose adjustment. The dose adjustment part and the electromagnetic power part are sequentially arranged inside the cylinder body, and the ampoule outer sleeve is installed at one end of the cylinder body.

[0009] The dose adjustment part and the electromagnetic power part are used as the dose adjustment and power parts of the needleless syringe. Under the drive of the dose adjustment part, the piston push rod inside the ampoule outer sleeve is reciprocated along the axial direction of the ampoule outer sleeve to realize the aspiration and injection of the drug by the ampoule part. The dose adjustment part rotates to complete the aspiration of the drug by the ampoule part connected to the front part of the medicine bottle connection body. Then, the electromagnetic power part placed behind the dose adjustment part provides power to inject the drug. The structure is simple, the whole machine has few parts, the manufacturing cost is low, and the unstable factors brought by multiple parts are greatly reduced. The appearance is small and convenient to carry out. Rotating the dose adjustment device can realize the aspiration of the liquid medicine and the discharge of air. The push-pull electromagnet is used as the power source, and the push-pull electromagnet has a self-resetting function without manual resetting. The injection is completed as soon as the drug aspiration is completed.

[0010] Further, the dose adjustment part includes a hollow medicine bottle connection body and a dose adjustment button for controlling the piston push rod to move along the length direction of the ampoule outer sleeve inside the ampoule outer sleeve. One end of the ampoule outer sleeve away from its liquid discharge port is installed at the end of the medicine bottle connection body; one end of the piston push rod away from the liquid discharge port is provided with a piston pulling part, and the piston pulling part is installed inside the medicine bottle connection body and can slide along the length direction of the medicine bottle connection body.

[0011] Further, two sliding grooves are oppositely arranged along the axial direction on the side wall of the medicine bottle connection body. One end of the piston push rod away from the liquid discharge port is connected to the piston pulling part. Both sides of the piston pulling part are slidably embedded in the sliding grooves and form sliding blocks protruding outside the sliding grooves. A spiral groove is provided on the inner side wall of the dose adjustment button, and the sliding blocks are sleeved in the spiral groove.

[0012] Further, the electromagnetic power part includes a push-pull electromagnet. One end of the push-pull electromagnet is installed at one end of the medicine bottle connection body away from the ampoule outer sleeve. An electric iron core with one end penetrating into the inside of the medicine bottle connection body is arranged along the length direction inside the push-pull electromagnet. The electric iron core is in clearance fit with the inner cavity of the push-pull electromagnet. An electromagnetic contact rod is arranged at the other end of the push-pull electromagnet; a blocking block is arranged at one end of the electric iron core placed inside the medicine bottle connection body, and the blocking block is in contact connection with the piston pulling part.

[0013] Further, the electric iron core includes a thin electric iron core and a thick electric iron core connected integrally. The thin electric iron core is placed inside the medicine bottle connection body. The thick electric iron core is in clearance fit with the inner cavity of the push-pull electromagnet. A return spring is sleeved on the free end of the thick electric iron core located outside the push-pull electromagnet, and a spring baffle is arranged at the end of the thick electric iron core;

[0014] When in the injection completion state, the thin electric iron core abuts against the piston pulling member and pushes the piston pulling member to the inner cavity end of the vial connection body close to the ampoule outer sleeve.

[0015] Further, one end of the vial connection body close to the ampoule outer sleeve is provided with a first connecting shaft, and the other end is provided with a second connecting shaft. The first connecting shaft and the second connecting shaft are integrally provided with the vial connection body. The ampoule outer sleeve is mounted on the first connecting shaft, and the piston push rod passes through the first connecting shaft and is connected to the piston pulling member.

[0016] Further, the dose adjustment button is sleeved in the cylinder body, and one end of the dose adjustment button close to the ampoule outer sleeve extends from the end of the cylinder body and is exposed outside to form a rotating stripe;

[0017] The vial connection body is sleeved inside the dose adjustment button, and the second connecting shaft at the end far from the ampoule outer sleeve passes through the end of the dose adjustment button and is sleeved with the inner wall of the cylinder body.

[0018] Further, a baffle is fixedly provided on the outer side of the ampoule outer sleeve close to the vial connection body, a limit cap is mounted on the outer wall of the first connecting shaft, one end of the limit cap is in contact connection with the dose adjustment button, and the other end is in contact connection with the baffle.

[0019] Further, the push-pull type electromagnet includes a bracket inner cylinder and an electromagnetic coil placed outside the bracket inner cylinder. The electromagnetic coil is electrically connected to the electromagnetic contact rod. The outside of the electromagnetic coil is wrapped with a housing, and one end of the housing close to the ampoule outer sleeve is mounted on the second connecting shaft.

[0020] Further, a power supply part is provided at one end of the cylinder body far from the ampoule part. The power supply part includes an outer housing and a storage battery arranged inside the outer housing. The end of the storage battery facing away from the thick electric iron core passes through the outer housing and is provided with an injection trigger button, and the injection trigger button is electrically connected to the storage battery. A charging port is provided on the side of the storage battery passing through the outer housing, and the electromagnetic contact rod is electrically connected to the storage battery.

[0021] Beneficial effects:

[0022] The beneficial effects produced by adopting the technical solution of the present invention are as follows:

[0023] (1) The ampoule part and the dose adjustment part are connected. By rotating the dose adjustment button, the piston pulling part inside the vial connection body slides axially along the vial connection body. Further, the piston pushing rod connected to the piston pulling part is driven by the piston pulling part to reciprocate axially along the ampoule outer sleeve to achieve the aspiration and injection of the drug by the ampoule part. The operating principle is simple, the whole machine has few components, the manufacturing cost is low, the unstable factors brought by multiple components can be reduced, manual adjustment is safer and does not require manual reset. After the drug aspiration is completed, providing power can complete the injection.

[0024] (2) The overall syringe has a small and compact shape, which is convenient for going out and carrying. It has a dose adjustment function, which is convenient for users to adjust the dose. An injection trigger button is set at the end of the syringe. After the drug aspiration is completed, pressing the injection trigger button can complete the injection with one key. The trigger power is provided by a push-pull electromagnet, and the trigger power is stable and can work continuously. The usage steps are simple and the usage difficulty is also reduced; the power comes from the electromagnetic energy that is available immediately when powered on, completely avoiding the danger of accidental ejection that is prone to occur in the mechanical energy storage method; in addition, the working noise of the push-pull electromagnet is much smaller than the spring impact sound, and is also much smaller than the vibration brought by the spring impact. When injecting, the pain felt by the human body is less, improving the acceptance of patients.

[0025] (3) Compared with traditional needle injection, needle-free injection avoids the risks of needle cross-infection, needle breakage, and accidental stabbing of medical staff or patients. It can reduce the pain and fear of patients during drug injection, reduce the risk of bacterial infection, avoid accidents such as needle scratches and breakage, the drug is absorbed quickly, there is no hardening under the skin after long-term use, and the injection efficiency is high. In addition, for patients with diabetes or other diseases that require daily drug injection, repeated needle injection will also cause subcutaneous nodules at the injection site, and needle-free injection can completely avoid such defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 is a schematic structural diagram of an electric needle-free syringe of the present invention;

[0028] Figure 2 is an exploded structural diagram of an electric needle-free syringe of the present invention;

[0029] Figure 3 is an exploded structural diagram of an electric needle-free syringe of the present invention from another angle;

[0030] Figure 4 It is a partial sectional view of an electric needleless injector of the present invention;

[0031] Figure 5 It is a schematic structural diagram of a medicine bottle connection main body of an electric needleless injector of the present invention;

[0032] Figure 6 It is a schematic structural diagram of a piston pulling member of an electric needleless injector of the present invention;

[0033] Figure 7 It is a schematic sectional structural diagram of an electric needleless injector of the present invention;

[0034] Figure 8 It is a schematic sectional structural diagram of another state of an electric needleless injector of the present invention;

[0035] In the figure, 1. cylinder body; 2. ampoule part; 3. ampoule outer sleeve; 4. piston push rod; 5. electromagnetic power part; 6. dose adjustment part; 7. medicine bottle connection main body; 8. dose adjustment button; 9. piston pulling member; 10. sliding groove; 11. sliding block; 12. spiral groove; 13. push-pull electromagnet; 14. electromagnetic contact rod; 15. blocking block; 16. thin electric iron core; 17. thick electric iron core; 18. return spring; 19. spring baffle; 20. first connecting shaft; 21. second connecting shaft; 22. rotating stripe; 23. baffle; 24. limit cap; 25. inner cylinder of the bracket; 26. electromagnetic coil; 27. housing; 28. power supply part; 29. outer housing; 30. storage battery; 31. injection trigger button; 32. charging port; 33. connection hole; 34. limit groove. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] In this embodiment, a piston pulling member disposed inside the medicine bottle connection main body drives a dose adjustment button disposed on the inner and outer sides of the medicine bottle connection main body to rotate, so as to complete the aspiration of the medicine by the ampoule part connected to the front part of the medicine bottle connection main body. Then, the electromagnetic power part disposed at the rear side of the medicine bottle connection main body provides power to inject the medicine. The structure is simple, the whole machine has few components, the manufacturing cost is low, the instability factors brought by multiple components are reduced, and the appearance is small and convenient to carry out. The push-pull type electromagnet is used as the power source and has a self-resetting function, without manual power loading and manual resetting. The injection preparation is completed immediately after the medicine aspiration is completed, and the operation is simple. The specific implementation mode is as follows:

[0038] As Figures 1-6 shown, an electric needleless syringe includes a cylinder body 1 and an ampoule part 2. The ampoule part 2 includes an ampoule outer sleeve 3 and a piston push rod 4 sleeved inside the ampoule outer sleeve 3;

[0039] It further includes an electromagnetic power part 5 for pushing the piston push rod 4 to move towards the liquid discharge port of the ampoule outer sleeve 3 and a dose adjustment part 6 for dose adjustment. The dose adjustment part 6 and the electromagnetic power part 5 are sequentially disposed inside the cylinder body 1, and the ampoule outer sleeve 3 is installed at one end of the cylinder body 1.

[0040] Here, the dose adjustment part 6 and the electromagnetic power part 5 are used as the dose adjustment and power parts of the needleless syringe. Under the drive of the dose adjustment part 6, the piston push rod 4 inside the ampoule outer sleeve 3 reciprocates along the axial direction of the ampoule outer sleeve 3 to achieve the aspiration and injection of the medicine by the ampoule part 2. The dose adjustment part 6 rotates to complete the aspiration of the medicine by the ampoule part 2 connected to the front part of the medicine bottle connection main body 7. Then, the electromagnetic power part 5 disposed behind the dose adjustment part 6 provides power to inject the medicine. The structure is simple, the whole machine has few components, the manufacturing cost is low, and the instability factors brought by multiple components are greatly reduced. The appearance is small and convenient to carry out. Rotating the dose adjustment device can achieve the aspiration of the liquid medicine and the discharge of air. The push-pull type electromagnet 13 is used as the power source, and the push-pull type electromagnet 13 has a self-resetting function, without manual resetting. The injection is completed immediately after the medicine aspiration is completed.

[0041] As a preferred embodiment, the dose adjustment part 6 includes a hollow medicine bottle connection main body 7 and a dose adjustment button 8 for controlling the piston push rod 4 to move along the length direction of the ampoule outer sleeve 3 inside the ampoule outer sleeve 3. One end of the ampoule outer sleeve 3 away from its liquid discharge port is installed at the end of the medicine bottle connection main body 7; One end of the piston push rod 4 away from the liquid discharge port is provided with a piston pulling member 9, and the piston pulling member 9 is installed inside the medicine bottle connection main body 7 and can slide along the length direction of the medicine bottle connection main body 7.

[0042] Here, by rotating the dose adjustment button 8, the piston puller 9 slides axially inside the vial connection body 7, and further drives the piston push rod 4 connected to the piston puller 9 to reciprocate axially along the ampoule outer sleeve 3 through the piston puller 9, so as to achieve the aspiration and injection of the drug by the ampoule part 2. A connection hole 33 is provided in the middle of the piston puller 9, and a connection end portion matching the connection hole 33 is provided at one end of the piston push rod 4 close to the vial connection body 7. The piston push rod 4 passes through the first connecting shaft 20 and is sleeved in the connection hole 33.

[0043] As a preferred embodiment, two sliding grooves 10 are axially and oppositely provided on the side wall of the vial connection body 7. One end of the piston push rod 4 away from the liquid discharge port is connected to the piston puller 9. Both sides of the piston puller 9 are slidably embedded in the sliding grooves 10 and form sliding blocks 11 outside the sliding grooves 10. A spiral groove 12 is provided on the inner side wall of the dose adjustment button 8, and the sliding blocks 11 are sleeved in the spiral groove 12.

[0044] Here, by passing the piston puller 9 out of the sliding groove 10 and providing sliding blocks 11 on the passed-out part, and a spiral groove 12 is provided on the inner side wall of the corresponding dose adjustment button 8 to sleeve the sliding blocks 11 in the spiral groove 12, the linkage between the vial connection body 7 and the dose adjustment button 8 can be realized, and further the reciprocating sliding of the piston puller 9 inside the vial connection body 7 can be realized. A limiting groove 34 is provided at one end of the sliding groove 10 away from the ampoule outer sleeve 3, and the size of the limiting groove 34 matches that of the sliding block 11. When the whole device is placed obliquely after manually sucking the drug, the piston puller 9 slides towards the ampoule outer sleeve 3, which can prevent the aspirated liquid medicine from being discharged.

[0045] Here, a limiting groove 34 is provided at one end of the sliding groove 10 away from the ampoule outer sleeve 3, and the size of the limiting groove 34 matches that of the sliding block 11. When the whole device is placed obliquely after manually sucking the drug, the piston puller 9 slides towards the ampoule outer sleeve 3, which can prevent the aspirated liquid medicine from being discharged.

[0046] As a preferred embodiment, the electromagnetic power part 5 includes a push-pull electromagnet 13. One end of the push-pull electromagnet 13 is installed at one end of the vial connection body 7 away from the ampoule outer sleeve 3. An electric iron core with one end penetrating into the vial connection body 7 is provided along the length direction inside the push-pull electromagnet 13. The electric iron core is in clearance fit with the inner cavity of the push-pull electromagnet 13. An electromagnetic contact rod 14 is provided at the other end of the push-pull electromagnet 13. A blocking block 15 is provided at the end of the electric iron core placed inside the vial connection body 7, and the blocking block 15 is in contact connection with the piston puller 9.

[0047] Here, a push-pull electromagnet 13 is used as the power source. The push-pull electromagnet 13 has a self-resetting function, eliminating the need for manual power loading and manual resetting. After the injection preparation is completed, the push-pull electromagnet 13 is activated. The power provided by the push-pull electromagnet 13 triggers stable power, simplifies the usage steps, and reduces the usage difficulty at the same time. The blocking block 15 is set to be cylindrical and matches the contact part of the piston pulling member 9.

[0048] Here, the outer diameter of the blocking block 15 is set to be larger than the inner diameter of the second connecting shaft 21. While increasing the force-bearing area, it can prevent the electric iron core from being pulled out from the inside of the medicine bottle connection body 7 after resetting, and avoid mechanical friction caused by repeatedly penetrating into the inside of the medicine bottle connection body 7 during multiple reciprocations when injecting again.

[0049] As a preferred embodiment, the electric iron core includes a thin electric iron core 16 and a thick electric iron core 17 connected integrally. The thin electric iron core 16 is placed inside the medicine bottle connection body 7, and the thick electric iron core 17 is in clearance fit with the inner cavity of the push-pull electromagnet 13. A reset spring 18 is sleeved on the free end of the thick electric iron core 17 located outside the push-pull electromagnet 13, and a spring baffle 19 is arranged at the end of the thick electric iron core 17;

[0050] When in the injection completed state, the thin electric iron core 16 abuts against the piston pulling member 9 and pushes the piston pulling member 9 to the inner cavity end of the medicine bottle connection body 7 close to the ampoule outer sleeve 3.

[0051] Here, the electric iron core is set as the thin electric iron core 16 and the thick electric iron core 17. The thin electric iron core 16 is placed inside the medicine bottle connection body 7, while the thick electric iron core 17 is used to maintain contact with the inner cavity of the push-pull electromagnet 13 to complete the pulling and pushing action of the piston. After the injection is completed, the electric iron core is reset to its original position through the reset spring 18. At this time, the thin electric iron core 16 returns to the end of the medicine bottle connection body 7 close to the second connecting shaft 21, and a small part of the thick electric iron core 17 is placed inside the inner cavity of the push-pull electromagnet 13, and most of it is pulled by the reset spring 18 and placed outside the inner cavity of the push-pull electromagnet 13.

[0052] As a preferred embodiment, one end of the medicine bottle connection body 7 close to the ampoule outer sleeve 3 is provided with a first connecting shaft 20, and the other end is provided with a second connecting shaft 21. The first connecting shaft 20 and the second connecting shaft 21 are integrally arranged with the medicine bottle connection body 7. The ampoule outer sleeve 3 is installed on the first connecting shaft 20, and the piston push rod 4 passes through the first connecting shaft 20 and is connected to the piston pulling member 9.

[0053] Here, by providing the first connecting shaft 20 and the second connecting shaft 21 at both ends of the medicine bottle connection body 7, the connection between the medicine bottle connection body 7 and the ampoule outer sleeve 3, the push-pull electromagnet 13, and the cylinder 1 at the front and rear ends is realized, and at the same time, it also limits the piston pulling member 9 inside the medicine bottle connection body 7.

[0054] As a preferred embodiment, the dose adjustment button 8 is sleeved in the cylinder body 1, and at one end of the dose adjustment button 8 close to the ampoule outer sleeve 3, it extends from the end of the cylinder body 1 and is exposed outside to form a rotating stripe 22;

[0055] The medicine bottle connection main body 7 is sleeved inside the dose adjustment button 8, and the second connecting shaft 21 at one end of the dose adjustment button 8 far from the ampoule outer sleeve 3 passes through the end of the dose adjustment button 8 and is sleeved with the inner wall of the cylinder body 1.

[0056] As a preferred embodiment, a baffle 23 is fixedly arranged on the outer side of the ampoule outer sleeve 3 close to the medicine bottle connection main body 7, a limit cap 24 is installed on the outer wall of the first connecting shaft 20, one end of the limit cap 24 is in contact connection with the dose adjustment button 8, and the other end is in contact connection with the baffle 23.

[0057] Here, when rotating the piston pulling member 9, it is possible to choose to rotate at the rotating stripe 22 of the dose adjustment button 8 or choose to rotate the limit cap 24. The outer wall of the second connecting shaft 21 is provided with a clamping surface, and the clamping surface is connected to the inner wall of the middle part of the cylinder body 1, effectively fixing the cylinder body 1.

[0058] As a preferred embodiment, the push-pull electromagnet 13 includes a bracket inner cylinder 25 and an electromagnetic coil 26 placed outside the bracket inner cylinder 25. The electromagnetic coil 26 is electrically connected to the electromagnetic contact rod 14, and the outside of the electromagnetic coil 26 is wrapped with a housing 27. One end of the housing 27 close to the ampoule outer sleeve 3 is installed on the second connecting shaft 21.

[0059] As a preferred embodiment, a power supply part 28 is arranged at one end of the cylinder body 1 far from the ampoule part 2. The power supply part 28 includes an outer housing 29 and a storage battery 30 arranged inside the outer housing 29. An injection trigger button 31 is arranged at the end of the storage battery 30 facing away from the thick electric iron core 17 and passing through the outer housing 29, and the injection trigger button 31 is electrically connected to the storage battery 30. A charging port 32 is arranged on the side of the storage battery 30 passing through the outer housing 29, and the electromagnetic contact rod 14 is electrically connected to the storage battery 30.

[0060] Here, a plurality of clamping plates are arranged around the storage battery 30 inside the outer housing 29, and the storage battery 30 is tied at the central position formed by the clamping plates.

[0061] Embodiment 1

[0062] Refer to Figure 7As shown, this figure is a state diagram where the injection preparation is completed. The ampoule part 2 is taken out of the package and then rotatably installed on the vial connection body 7. The dosage adjustment button 8 is rotated. The dosage adjustment button 8 drives the piston pulling member 9 to move to the right. The piston pulling member 9 drives the piston push rod 4 to move to the right, achieving drug aspiration. Rotating the dosage adjustment button 8 in the reverse direction drives the piston pulling member 9 to move to the left. The piston pulling member 9 drives the piston push rod 4 to move to the left, completing air discharge. The power adapter is connected to the power interface. At this time, the syringe has completed the injection preparation work.

[0063] Embodiment 2

[0064] Referring to Figure 8 As shown, this figure is a state diagram where the injection is completed. After the syringe has completed the injection preparation work, the injection trigger button 31 is pressed. At this time, the power of the push-pull electromagnet 13 is turned on. The thick electric iron core 22 and the thin electric iron core 16 in the middle of the push-pull electromagnet 13 move to the left as a whole, driving the piston pulling member 9 to move to the left. The piston pulling member 9 drives the piston push rod 4 to move to the left, thereby realizing the extrusion of the drug from the inner cavity of the ampoule outer sleeve 3. The injection trigger button 31 is continuously pressed until the drug is completely discharged from the inner cavity of the ampoule outer sleeve 3, and then the injection trigger button 31 is released. The push-pull electromagnet 13 is powered off, and the thick electric iron core 22 and the thin electric iron core 16 in the middle of the push-pull electromagnet 13 are reset by the return spring 18. At this time, the syringe has completed self-resetting.

[0065] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric needle-free injector, characterized in that: It comprises a cylinder (1) and an ampoule part (2), wherein the ampoule part (2) comprises an ampoule outer sleeve (3) and a piston push rod (4) sleeved in the ampoule outer sleeve (3); The device also comprises an electromagnetic power unit (5) for pushing the piston push rod (4) to move in the direction of the liquid discharge port of the ampoule outer sleeve (3) and a dose adjustment unit (6) for adjusting the dose, wherein the dose adjustment unit (6) and the electromagnetic power unit (5) are arranged inside the barrel (1), and the ampoule outer sleeve (3) is mounted on one end of the barrel (1).

2. The electric needle-free injector according to claim 1, characterized in that: The dosage adjustment portion (6) comprises a hollow medicine bottle connecting body (7) and a dosage adjustment button (8) for controlling the piston push rod (4) to move in the ampoule jacket (3) along the length direction of the ampoule jacket (3); the end of the ampoule jacket (3) away from its discharge port is mounted on the end of the medicine bottle connecting body (7); the end of the piston push rod (4) away from the discharge port is mounted with a piston puller (9); the piston puller (9) is mounted in the medicine bottle connecting body (7) and can slide along the length direction of the medicine bottle connecting body (7).

3. The electric needle-free injector according to claim 2, characterized in that: Two sliding grooves (10) are provided on the side wall of the medicine bottle connecting body (7) in an axial direction, and the piston push rod (4) is connected to the piston puller (9) at one end away from the discharge port. The piston puller (9) is slidably embedded in the sliding grooves (10) on both sides and passes through the sliding grooves (10) to form sliding blocks (11) on the outside. The inner wall of the dosage adjustment button (8) is provided with a spiral groove (12), and the sliding block (11) is sleeved in the spiral groove (12).

4. The electric needle-free injector according to claim 2, characterized in that: The electromagnetic power unit (5) comprises a push-pull electromagnet (13), one end of which is mounted on the end of the medicine bottle connecting body (7) away from the ampoule sleeve (3), the push-pull electromagnet (13) is provided with an electric iron core along its length direction, one end of which penetrates into the medicine bottle connecting body (7), the electric iron core is fitted with the inner cavity gap of the push-pull electromagnet (13), and the other end of the push-pull electromagnet (13) is provided with an electromagnetic contact rod (14); one end of the electric iron core placed inside the medicine bottle connecting body (7) is provided with a blocking block (15), and the blocking block (15) is in contact with and connected to the piston pulling member (9).

5. The electric needle-free injector according to claim 4, characterized in that: The electric iron core comprises a thin electric iron core (16) and a thick electric iron core (17) which are integrally connected, the thin electric iron core (16) being placed inside the medicine bottle connecting body (7), the thick electric iron core (17) being matched with the inner cavity gap of the push-pull electromagnet (13), the free end of the thick electric iron core (17) located outside the push-pull electromagnet (13) being sleeved with a return spring (18), and the end of the thick electric iron core (17) being provided with a spring baffle (19); When the injection is completed, the thin electric iron core (16) abuts against the piston puller (9) and pushes the piston puller (9) to the inner cavity end of the medicine bottle connecting body (7) close to the ampoule sleeve (3).

6. The electric needle-free injector according to claim 2, characterized in that: The medicine bottle connecting body (7) is provided with a first connecting shaft (20) at one end close to the ampoule sleeve (3), and a second connecting shaft (21) at the other end. The first connecting shaft (20) and the second connecting shaft (21) are integrally arranged with the medicine bottle connecting body (7), the ampoule sleeve (3) is installed on the first connecting shaft (20), and the piston push rod (4) passes through the first connecting shaft (20) and is connected to the piston puller (9).

7. The electric needle-free injector according to claim 6, characterized in that: The dosage adjustment button (8) is sleeved in the barrel (1), and the dosage adjustment button (8) is extended from the end of the barrel (1) at one end close to the ampoule jacket (3) and is exposed to the outside to form a rotating stripe (22); The medicine bottle connecting body (7) is sleeved inside the dosage adjustment button (8) and the second connecting shaft (21) at one end away from the ampoule sleeve (3) passes through the end of the dosage adjustment button (8) and is sleeved with the inner wall of the barrel (1).

8. The electric needle-free injector according to claim 6, characterized in that: A baffle (23) is fixedly provided on the outer side of the ampoule sleeve (3) close to the medicine bottle connecting body (7), and a limiting cap (24) is installed on the outer wall of the first connecting shaft (20), one end of the limiting cap (24) is in contact with the dosage adjustment button (8), and the other end is in contact with the baffle (23).

9. The electric needle-free injector according to claim 4, characterized in that: The push-pull electromagnet (13) comprises a support inner cylinder (25) and an electromagnetic coil (26) disposed outside the support inner cylinder (25), wherein the electromagnetic coil (26) is electrically connected to the electromagnetic contact rod (14), and the outer side of the electromagnetic coil (26) is wrapped with a shell (27), and the shell (27) is mounted on the second connecting shaft (21) at one end close to the ampoule sleeve (3).

10. The electric needle-free injector according to claim 5, characterized in that: A power supply unit (28) is provided at one end of the barrel (1) away from the ampoule unit (2), and the power supply unit (28) comprises an outer shell (29) and a storage battery (30) arranged inside the outer shell (29); an injection trigger button (31) is provided at the end of the storage battery (30) away from the thick electric iron core (17) and passes through the outer shell (29), and the injection trigger button (31) is electrically connected to the storage battery (30); a charging port (32) is provided on the side of the storage battery (30) and passes through the outer shell (29); and the electromagnetic contact rod (14) is electrically connected to the storage battery (30).

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