Needleless injection device pushed by low air pressure

Abstract

The utility model relates to a needleless injection device pushed by low air pressure. The needleless injection device comprises a shell, an injection assembly and an adjusting assembly. Low air pressure is used as injection power, secondary stroke is ingeniously utilized, the injection bionics principle is adopted, an injection channel is opened firstly, and then liquid is slowly pushed in for injection; the precise adjustment of the injection dosage and the precise adjustment of the injection depth are realized by utilizing the structural matching of the servo motor and the screw rod nut, so that the automatic continuous feeding of liquid medicine is realized in the injection process, and the injection dosage and the injection depth can be precisely adjusted. According to the utility model, the injected liquid is completely isolated from a power air source and does not contact with the power air source, so that the injected liquid is greatly protected from being polluted by the air source, and the safety of a receptor is correspondingly protected. The syringe is simple to operate, easy to master, painless, free of cross infection and bleeding, capable of greatly reducing injury and fear to a patient in the injection process, and beneficial to application and popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, and particularly relates to a needle-free injection device driven by low air pressure. Background Art

[0002] Using a needle to inject and deliver drugs is one of the most common methods in modern medicine, but needle injection has corresponding disadvantages: First, many people suffer from severe needle phobia. The pain and fear caused by the injection needle will seriously affect the willingness of patients to accept, and sometimes it is even necessary to complete drug injection by prior anesthesia. Second, when using, recycling, and destroying injection needles, the relevant economic and human costs are very high. Transdermal drug delivery refers to a drug delivery method that delivers drugs through the skin. During the process of the drug reaching its target, there is no loss, which can enhance the drug delivery efficiency, continuously release the drug, and minimize adverse reactions.

[0003] Compared with oral and injection drug delivery, transdermal drug delivery has the advantages of accessibility and a large surface area, and can also avoid oral drug delivery problems such as gastric inflammation, first-pass elimination by the liver, and poor patient compliance. The stratum corneum of the skin has a large molecular weight and high density. In practice, using passive diffusion to deliver drugs is limited to lipophilic and low-molecular-weight drugs, and the delivery efficiency is limited. Destroying the stratum corneum of the skin physically or chemically can increase the passive drug delivery efficiency, including methods such as laser ablation of the skin, iontophoresis, electroporation, and ultrasonic drug delivery. These techniques enable drugs to better penetrate the stratum corneum and improve the efficacy of passive diffusion drug delivery in clinical trials, but they have disadvantages such as limited delivery efficiency, skin damage, and complex devices.

[0004] Needle-free injection technology (NFIT) refers to an injection technology that uses the instantaneous high pressure generated by a pressure source to make the drug in the syringe form a high-speed and high-pressure jet through a nozzle, and reach an appropriate depth through the outer layer of the skin for absorption and exert its drug effect. Compared with needle injection and transdermal drug delivery by passive delivery, NFIT can achieve intradermal, subcutaneous, and intramuscular injections, play local or systemic therapeutic roles, has good drug delivery efficiency, accurate dosage, and faster absorption, and is increasingly valued by researchers as an alternative to needle injection in some fields.

[0005] Chinese Patent CN219878852U discloses a spring-loaded needleless syringe with a safety locking function, which includes a rear housing, a front housing, a button mechanism, a locking mechanism, a pressurizing mechanism, an injection push rod, and a clamping table; the rear end of the pressurizing mechanism is nested in the rear housing, and the front end is nested in the front housing; the clamping table is threadedly connected to the rear end of the pressurizing mechanism, the injection push rod passes through the inner hole of the clamping table and extends into the interior of the pressurizing mechanism, a plurality of slot holes are circumferentially arranged on the clamping table, balls are placed in the slot holes, and grooves matching the slot holes are arranged on the injection push rod; the button mechanism is sleeved on the rear end of the clamping table, and the locking mechanism is installed on the rear housing for locking the button mechanism. By adding a safety locking function, the utility model improves the operation safety of the spring-driven needleless syringe, and at the same time improves the problems of excessive volume and weight existing in the traditional spring-driven needleless syringe.

[0006] However, this needleless syringe is only driven by a spring, and it is not easy to control the dosage and injection depth. The bleeding point is large, the pain is great, and sometimes anesthetic needs to be injected, which requires high qualifications and skills for operators.

[0007] Therefore, it is necessary to invent a low-pressure-driven needleless injection device to solve the above problems. Summary of the Invention

[0008] The purpose of the present utility model is to provide a needleless injection device with simple operation, painless, no bleeding point, no need for anesthetic injection, not easy to cause cross-infection, adjustable injection dosage and depth, and wide application range.

[0009] To achieve the above purpose, the present utility model provides the following technical solutions:

[0010] A low-pressure-driven needleless injection device, including:

[0011] A housing;

[0012] An injection assembly; the injection assembly includes a first telescopic structure arranged in the housing, the first telescopic structure includes a first fixing member and a first telescopic member arranged on the first fixing member, the first fixing member is detachably connected to the housing, a second telescopic structure is detachably connected to the first telescopic member, the second telescopic structure includes a second fixing member and a second telescopic member arranged on the second fixing member, the injection assembly further includes a liquid storage connecting pipe arranged on the housing and a needleless syringe detachably connected to the liquid storage connecting pipe, the front end of the second telescopic member is a piston head, and the piston head extends into the liquid storage connecting pipe and fits with the inner wall of the liquid storage connecting pipe.

[0013] Further, both the first telescopic structure and the second telescopic structure are cylinders, both the first fixing member and the second fixing member are cylinder cavities, both the first telescopic member and the second telescopic member are piston air rods, and the injection assembly further includes a gas supply structure for supplying gas to the two cylinders. The gas supply structure includes an electromagnetic valve, a first air duct, and a second air duct. Two ends of the first air duct are respectively communicated with the electromagnetic valve and the first fixing member, and two ends of the second air duct are respectively communicated with the electromagnetic valve and the second fixing member.

[0014] Further, the injection assembly further includes a control button electrically connected to the electromagnetic valve. The control button has a closed state, a first open state, and a second open state. When the control button is in the first open state, the electromagnetic valve supplies gas to the first telescopic structure. When the control button is in the second open state, the electromagnetic valve supplies gas to the second telescopic structure.

[0015] Further, the needleless injection device further includes an adjustment assembly. The adjustment assembly includes a servo motor electrically connected to the control host, and a first gear disposed on an output shaft of the servo motor. The second telescopic member is a lead screw, and a second gear coaxially connected with the nut is disposed on the nut of the lead screw. The second gear is meshed and connected with the first gear.

[0016] Further, the injection assembly further includes a locking member. An installation hole is provided on the outer shell, and the locking member is inserted into the installation hole. The locking member moves along the axial direction to press against the outer surface of the second gear or away from the second gear.

[0017] The beneficial effects of the present utility model are as follows:

[0018] By using low air pressure as the injection power, the present utility model ingeniously utilizes the secondary stroke, adopts the principle of injection bionics, and injects in the way of first opening the injection channel and then slowly pushing in the liquid. By using the cooperation of the servo motor and the lead screw nut structure, precise adjustment of the injection dose and accurate adjustment of the injection depth are realized, so that automatic continuous feeding of the liquid medicine is achieved during the injection process, and the injection dose and the injection depth can be precisely adjusted. The liquid to be injected and the power gas source of the present utility model are completely isolated, and the two will not come into any contact, which greatly protects the injected liquid from being polluted by the gas source and correspondingly protects the safety of the recipient. The present utility model is simple and easy to operate, painless, does not cause cross-infection, does not bleed, and greatly reduces the damage and fear brought to the patient during the injection process, which is beneficial to application and popularization.

[0019] The above description is only an overview of the technical solution of the present utility model. In order to understand the technical means of the present utility model more clearly and be implemented in accordance with the content of the description, the following will describe in detail a preferred embodiment of the present utility model in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the overall structure of the needleless injection device (standby state) shown in a preferred embodiment of the present utility model;

[0022] Figure 2 Schematic diagram of the structure of the needleless injection device in the first telescopic state (the first strike to open the injection channel) shown in a preferred embodiment of the present utility model;

[0023] Figure 3 Schematic diagram of the structure of the needleless injection device in the second telescopic state (the second strike for slow injection) shown in a preferred embodiment of the present utility model. Detailed Description of the Preferred Embodiment

[0024] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] Please refer to Figures 1 to 3 As shown in the figure, a needleless injection device driven by low air pressure according to a preferred embodiment of the present application is used to reduce the damage and fear brought to patients during the injection process. The needleless injection device is simple to operate, painless, has no bleeding points, does not require anesthesia, is not prone to cross-infection, the injection dose and depth can be adjusted, and it has a wide range of applications. It includes: a housing 10, an injection assembly, and an adjustment assembly.

[0028] The injection assembly includes a first telescopic structure disposed in the housing 10. The first telescopic structure includes a first fixing member 13 and a first telescopic member 14 disposed on the first fixing member 13. The first fixing member 13 is detachably connected to the housing 10. A second telescopic structure is detachably connected to the first telescopic member 14. The second telescopic structure includes a second fixing member 18 and a second telescopic member 17 disposed on the second fixing member 18. The injection assembly further includes a liquid storage connection pipe 8 disposed on the housing 10 and a needleless syringe 2 detachably connected to the liquid storage connection pipe 8. The front end of the second telescopic member 17 is a piston head, and the piston head extends into the liquid storage connection pipe 8 and fits against the inner wall of the liquid storage connection pipe 8.

[0029] In this embodiment, both the first telescopic structure and the second telescopic structure are cylinders. Both the first fixing member 13 and the second fixing member 18 are cylinder cavities. Both the first telescopic member 14 and the second telescopic member 17 are piston air rods. The injection assembly further includes a gas supply structure for supplying gas to the two cylinders. The gas supply structure includes an electromagnetic valve 4, a first air duct 16, and a second air duct 19. The two ends of the first air duct 16 are respectively connected to the electromagnetic valve 4 and the first fixing member 13. The two ends of the second air duct 19 are respectively connected to the electromagnetic valve 4 and the second fixing member 18. The injection assembly further includes a control button 3 electrically connected to the electromagnetic valve 4. The control button 3 has a closed state, a first open state, and a second open state. When the control button 3 is in the first open state, the electromagnetic valve 4 supplies gas to the first telescopic structure. When the control button 3 is in the second open state, the electromagnetic valve 4 supplies gas to the second telescopic structure.

[0030] During the injection process, the solenoid valve 4 first supplies high-pressure air to the first telescopic structure, so that the first telescopic structure moves forward quickly, driving the second telescopic structure to move, and then the piston head of the second telescopic member 17 squeezes the liquid in the liquid storage pipe 8 to form a high-pressure jet to open the injection channel; then the second telescopic structure is supplied with low-pressure air to make the second telescopic member 17 move slowly, thereby realizing injection by slowly pushing the liquid.

[0031] The needle-free injection device also includes an adjustment component, which includes a servo motor 7 electrically connected to the control host, and a first gear 12 arranged on the output shaft of the servo motor 7. The second telescopic member 17 is a screw, and a second gear 1 coaxially connected to the nut is provided on the screw nut, and the second gear 1 is meshed and connected with the first gear 12. After the injection dose is set on the control host, the servo motor 7 rotates a corresponding number of circles after receiving the electrical signal transmitted by the control host, driving the second telescopic member 17 to move axially to change the position of the piston head of the second telescopic member 17 in the liquid storage pipe 8, thereby realizing the precise adjustment of the injection dose and the precise adjustment of the injection depth.

[0032] The injection assembly also includes a locking member 11. The housing 10 is provided with a mounting hole. The locking member 11 is inserted into the mounting hole. The locking member 11 moves along the axial direction to press against the outer tooth surface of the second gear 1 or away from the outer surface of the second gear 1. Specifically, when the syringe needs to be installed or removed, the locking member 11 is pressed so that the locking member 11 is pressed against the outer surface of the second gear 1 to lock the second gear 1 and prevent it from rotating, which is convenient for installation or removal. During the injection, the locking member 11 is away from the outer surface of the second gear 1 and does not hinder the rotation of the second gear 1.

[0033] The working principle of the needle-free injection device is:

[0034] Inject the liquid medicine into the liquid storage pipe 8, install the needle-free syringe 2 onto the liquid storage pipe 8, and press the locking member 11 during installation so that the locking member 11 is pressed against the outer surface of the second gear 1 to lock the second gear 1 to prevent it from rotating. Set the injection dose on the operation interface of the control host and adjust the injection depth. Press the control key 3 to exhaust the air, and after the air is exhausted, inject according to the previously set dose. During the injection process, first press the control key 3 to put it in the first open state, and the solenoid valve 4 supplies high-pressure air to the first telescopic structure, so that the first telescopic structure moves forward quickly, driving the second telescopic structure to move, and then the piston head of the second telescopic member 17 squeezes the liquid medicine in the liquid storage pipe 8 to form a high-pressure jet to open the injection channel; then press the control key 3 to put it in the second open state, and the solenoid valve 4 supplies low-pressure air to the second telescopic structure, so that the second telescopic member 17 moves slowly, thereby realizing the injection by slowly pushing the liquid in until the injection is completed.

[0035] In summary, the utility model uses low air pressure as the injection power, cleverly utilizes the secondary stroke, adopts the principle of injection bionics, and injects by first opening the injection channel and then slowly pushing in the liquid; it uses the cooperation of a servo motor and a lead screw nut structure to achieve precise adjustment of the injection dose and accurate adjustment of the injection depth, so as to realize automatic continuous feeding of the liquid medicine during the injection process and can precisely adjust the injection dose and injection depth. The liquid to be injected and the power air source of the utility model are completely isolated, and the two will not come into contact with each other, greatly protecting the injected liquid from being contaminated by the air source and correspondingly protecting the safety of the recipient. The utility model is simple and easy to operate, painless, does not cause cross-infection, and does not bleed, greatly reducing the damage and fear brought to the patient during the injection process, and is conducive to application and promotion.

[0036] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0037] The above-described embodiments only represent several implementation manners of the utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. A needle-free injection device driven by low pressure, characterized in that Comprising: A housing; An injection assembly; the injection assembly includes a first telescopic structure disposed within the housing, the first telescopic structure including a first fixing member and a first telescopic member disposed on the first fixing member, the first fixing member being detachably connected to the housing, a second telescopic structure being detachably connected to the first telescopic member, the second telescopic structure including a second fixing member and a second telescopic member disposed on the second fixing member, the injection assembly further including a liquid storage connection tube disposed on the housing and a needleless syringe detachably connected to the liquid storage connection tube, the front end of the second telescopic member being a piston head, the piston head extending into the liquid storage connection tube and being in contact with the inner wall of the liquid storage connection tube.

2. The needleless injection device driven by low air pressure according to claim 1, wherein Both the first telescopic structure and the second telescopic structure are cylinders, both the first fixing member and the second fixing member are cylinder cavities, both the first telescopic member and the second telescopic member are piston air rods, the injection assembly further including a gas supply structure for supplying gas to the two cylinders, the gas supply structure including an electromagnetic valve, a first gas pipe and a second gas pipe, the two ends of the first gas pipe being respectively connected to the electromagnetic valve and the first fixing member in communication, the two ends of the second gas pipe being respectively connected to the electromagnetic valve and the second fixing member in communication.

3. The needleless injection device driven by low air pressure according to claim 2, wherein The injection assembly further includes a control button electrically connected to the electromagnetic valve, the control button having a closed state, a first open state and a second open state; when the control button is in the first open state, the electromagnetic valve supplies gas to the first telescopic structure; when the control button is in the second open state, the electromagnetic valve supplies gas to the second telescopic structure.

4. The needle-free injection device driven by low air pressure according to claim 1, wherein The needleless injection device further includes an adjustment assembly, the adjustment assembly including a servo motor electrically connected to a control host and a first gear disposed on the output shaft of the servo motor, the second telescopic member being a lead screw, a second gear coaxially connected to the nut being provided on the nut of the lead screw, the second gear being meshed with the first gear.

5. The needle-free injection device driven by low air pressure according to claim 4, wherein, The injection assembly further includes a locking member, the housing being provided with a mounting hole, the locking member passing through the mounting hole, the locking member moving in the axial direction to press against or away from the outer surface of the second gear.

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