A needle-free syringe

Abstract

The present invention relates to a needle-free syringe, comprising an ampoule, a lower shell, an upper shell, a push rod and a striker; the upper shell and the lower shell are connected by threads, a main spring is arranged between the push rod and the upper shell, a button is arranged at the upper end of the push rod, a push rod locking structure is arranged between the push rod and the upper shell and the button, a first annular groove is arranged on the inner wall of the button for releasing the lock of the push rod; a button reset spring is arranged between the button and the push rod. An operating hand wheel is arranged outside the upper shell, a cylindrical mounting section is arranged at the upper end of the operating hand wheel, the button is located in the cylindrical mounting section, a limiting collar is arranged on the movable sleeve outside the cylindrical mounting section, a locking structure and a collar reset spring are arranged between the limiting collar and the operating hand wheel, a button locking structure is arranged between the cylindrical mounting section and the outer wall of the button, a button unlocking structure is arranged on the inner wall of the limiting collar; an end cap is connected to the upper part of the limiting collar on the cylindrical mounting section. When injecting, the limiting collar is first pushed down to unlock the button, and then the button is pressed to complete the injection process, which is convenient to operate.

Description

Technical Field

[0001] The invention relates to the field of medical devices for injecting liquid medicines, and in particular to a needle-free syringe. Background Art

[0002] A needle-free syringe is a medical device that does not require a needle and can save patients from the pain of acupuncture. It applies pressure to liquid medicine so that it is injected into the patient's subcutaneous tissue at a high speed in a high-pressure dispersion state through the micropores at the end. The existing needle-free syringe mainly includes a shell, an ampoule is arranged at the lower end of the shell, and a micropore is arranged at the end of the ampoule. A push rod and a pressurizing mechanism are arranged in the shell. A striker is connected to the lower end of the push rod, and a piston is arranged on the striker to extend into the interior of the ampoule. A roller for driving the striker to absorb the medicine is arranged on the shell. A button is arranged at the upper end of the shell, and a safety lock is arranged on the shell. Only when the safety lock is pressed and the button is pressed at the same time, the push rod will move to eject the medicine from the ampoule, that is, the user needs to use one hand to operate two buttons with mutually perpendicular action directions at the same time to complete the injection, which is inconvenient to operate. In addition, the existing needle-free syringe has the problem of excessive pressure operation force, which is not convenient for weak patients and elderly patients to use. At the same time, the existing needle-free syringes cannot be completely restored to their original position after being used for injection, resulting in increased accuracy errors and inability to accurately administer drugs, posing a safety hazard. Summary of the invention

[0003] The purpose of the present invention is to provide an easy-to-operate needle-free syringe to solve the problems in the prior art of excessive pressure operation force and the need to operate two buttons with mutually perpendicular action directions with one hand at the same time, resulting in inconvenience in operation.

[0004] To achieve the above-mentioned purpose, a needle-free syringe of the present invention adopts the following technical scheme: a needle-free syringe comprises an upper shell and a lower shell, the lower end of the lower shell is threadedly connected to an ampoule with micropores, and the upper and lower shells are threadedly connected; push rods are arranged in the upper and lower shells, a main spring is arranged between the push rod and the upper shell, the upper end of the upper shell has a mounting tube, the push rod has a guide mounting section installed in the mounting tube with a lower guide, the upper and lower movable sleeves of the outer wall of the mounting tube are provided with buttons, a first annular groove is arranged on the guide mounting section of the push rod, and the push rod, the upper shell and the button together form a push rod locking structure through a first limiting ball and the first annular groove. ; The inner wall of the button is provided with a first annular groove for releasing the lock of the push rod; a button reset spring is provided between the button and the guide mounting section; an operating handwheel is provided on the outside of the upper shell body, and a cylindrical mounting section is provided on the upper end of the operating handwheel, and the button is located in the cylindrical mounting section, and a limiting collar is provided on the lower and upper guide movable sleeves on the outside of the cylindrical mounting section, and a locking structure and a collar reset spring are provided between the limiting collar and the operating handwheel, a button locking structure is provided between the cylindrical mounting section and the outer wall of the button, and a button unlocking structure is provided on the inner wall of the limiting collar; an end cover is connected to the cylindrical mounting section above the limiting collar, and the end cover is used for limiting the button.

[0005] The button locking structure includes a second annular groove arranged on the outer wall of the button, a tapered hole is arranged on the cylindrical mounting section, a second limiting ball is installed between the second annular groove and the tapered hole, and the button unlocking structure includes a second annular groove arranged on the inner wall of the limiting collar.

[0006] A spring installation groove for installing a sleeve ring reset spring is arranged between the operating hand wheel and the cylindrical installation section.

[0007] The locking structure comprises an annular protrusion arranged on the outer groove wall of the spring installation groove, and the lower end of the limiting collar is provided with a locking hook which is locked with the annular protrusion.

[0008] The limiting collar is provided with an anti-slip structure.

[0009] The push rod also has a spring installation section, and the guide installation section and the spring installation section are connected via a threaded structure so that the length of the entire push rod can be adjusted.

[0010] The beneficial effects of the present invention are as follows: during installation, the push rod and the upper housing are limited by the push rod locking structure, at which time the main spring is in a compressed state and the pressure is maintained by the push rod locking structure; by rotating the operating hand wheel, the upper housing, the push rod, the end cover, the limiting collar and the button are driven to move to a suitable position as a whole, that is, to the required injection dosage position; during injection, the limiting collar is first pushed down to compress the collar reset spring, and the limiting collar is limited and fixed by the latch structure, at which time the button is unlocked; then the button is pressed to unlock the push rod locking structure, that is, the push rod and the upper housing are unlocked; at this time, the push rod moves downward at high speed under the action of the main spring, pushing out the liquid medicine in the ampoule, and injecting it under the patient's skin at high speed and high pressure. The needle-free syringe of the present invention is divided into two steps during injection, first pushing the limiting collar downward and fixing its position to unlock the button, and only pressing the button during injection can complete the injection process, which is more convenient to operate than the prior art. Moreover, the setting of the operating hand wheel reduces the operating force during pressurization, which is suitable for weak and elderly patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an embodiment of a needle-free syringe of the present invention;

[0012] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle push rod;

[0013] Figure 3 yes Figure 1 Schematic diagram of the structure of the needle-free syringe before injection;

[0014] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0015] An embodiment of a needle-free syringe of the present invention is as follows Figure 1-Figure 4As shown, it includes a lower shell 3 with an upper opening and an upper shell 7 with a lower opening, an ampoule 1 is connected to the lower end of the lower shell, an internal thread section 5 is provided inside the lower shell, and an external thread section 6 is threadedly connected to the internal thread section of the lower shell. A push rod is movably arranged in the lower shell, and a main spring 4 is arranged between the push rod and the upper shell. A limit step 19 is arranged at the lower end of the push rod, and one end of the main spring presses on the limit step; the main spring is located in the cavity of the upper shell, and the other end of the main spring presses on the upper end wall of the cavity of the upper shell. The upper end of the upper shell has a mounting cylinder 32 connected to the upper shell, the push rod has a guide mounting section 17 installed in the mounting cylinder, and the push rod also has a spring mounting section 18 located in the upper shell for the main spring to be installed. The diameter of the guide mounting section is smaller than the diameter of the spring mounting section, which is convenient for the installation of the main spring. The guide mounting section 17 and the spring mounting section 18 are connected by a threaded structure to adjust the length of the entire push rod to compensate for the error accumulation caused by the assembly of parts.

[0016] The guide mounting section 17 of the push rod is provided with a first annular groove 31. The push rod, the upper housing and the button together form a push rod locking structure through a first limiting ball 30 and the first annular groove 31. The push rod locking structure belongs to the prior art, and its specific structure is not described in detail here. The upper and lower movable sleeves of the outer wall of the installation cylinder are provided with a button 14, and the inner wall of the button is provided with a first annular groove 29 for releasing the lock of the push rod. A first return spring 28 is provided between the button and the guide mounting section.

[0017] The upper shell is externally connected to an operating handwheel 8, and the outer diameter of the operating handwheel 8 is larger than the outer diameter of the lower shell 3, which is convenient for weak and elderly patients to operate. The operating handwheel and the cylindrical mounting section are fixed and connected to each other through a spline installation. The upper end of the operating handwheel has a cylindrical mounting section 10, and the button 14 is located in the cylindrical mounting section 10. A limit collar 12 is provided on the lower and upper guide movable sleeves outside the cylindrical mounting section. A locking structure and a collar reset spring 9 are provided between the limit collar 12 and the operating handwheel 8. A spring mounting groove 23 for the collar reset spring to be installed is provided between the operating handwheel and the cylindrical mounting section. The locking structure includes an annular protrusion 25 provided on the outer groove wall of the spring mounting groove, and the lower end of the limit collar has a hook 24 that cooperates with the locking of the annular protrusion. An anti-skid structure 11 is provided on the limit collar, and the anti-skid structure is a plurality of anti-skid protrusions provided on the outer surface of the limit collar. A button locking structure is provided between the cylindrical mounting section and the outer wall of the button, and a button unlocking structure is provided on the inner wall of the limiting collar. The button locking structure includes a second annular groove 27 provided on the outer wall of the button, a tapered hole 26 is provided on the cylindrical mounting section, and a second limiting ball 16 is installed between the second annular groove and the tapered hole. The button unlocking structure includes a second annular groove 15 provided on the inner wall of the limiting collar.

[0018] An end cap 13 is connected to the cylindrical mounting section above the limiting collar, and the end cap is connected to the cylindrical mounting section by screws. A limiting structure is arranged between the end cap and the button, and the limiting structure is a shrinking structure. A step is arranged on the button to cooperate with the limiting stop of the shrinking structure to prevent the button from falling off. A striker 20 is movably arranged on the upper and lower parts of the lower shell body, and the striker 20 is threadedly connected to the push rod, and a piston 21 extending into the ampoule is arranged at the lower part of the striker. A striker driving structure is arranged on the lower shell body to drive the striker to rotate to realize the liquid aspiration and exhaust of the ampoule. The striker driving structure belongs to the prior art, and is not improved in the present invention. The original striker driving structure is still adopted, so its specific structure is not described in detail in this embodiment. It is still driven by a roller 2 to rotate with the striker, and the user only needs to rotate the roller to complete the aspiration and exhaust of the ampoule.

[0019] When in use, all parts are installed together, and the push rod and the upper shell are limited by the push rod locking structure. At this time, the main spring is in a compressed state and the pressure is maintained by the push rod locking structure. By turning the operating hand wheel, the upper shell, the push rod, the end cover, the limit collar and the button are moved to the appropriate position as a whole, that is, rotated to the required injection unit amount, and the striker is driven to rotate by the striker driving structure to complete the process of the ampoule absorbing the injection liquid and exhausting the air. During injection, the limit collar is first pushed downward to compress the collar reset spring, and the limit collar is limited and fixed by the clamping structure. At this time, the second limit ball is disengaged from the second ring groove, enters the second annular groove through the tapered hole part, and the button is unlocked. Then press the button, and the push rod is unlocked by the push rod unlocking structure. The push rod moves downward at high speed under the action of the main spring, and the liquid in the ampoule is pushed out at high speed and high pressure from the end micropore 22, and injected under the patient's skin. The needle-free syringe of the present invention is divided into two steps during injection. First, the limiting collar is pushed downward and its position is fixed to unlock the button. When injecting, the injection process can be completed by pressing the button. Compared with the prior art, the operation is more convenient. In addition, the outer diameter of the operating hand wheel is larger, which makes the operation convenient. For example, diabetic patients need to inject insulin every day, and the injection process is completed by the patients themselves. The larger outer diameter of the operating hand wheel is more suitable for patients with weak hands or the elderly or weak patients during operation. Furthermore, the push rod length is adjustable, which not only ensures the precision setting during assembly, but also the push rod adopts lower and upper double limiters, which can ensure accurate resetting for repeated injections, thereby ensuring the injection and drug administration accuracy of the syringe throughout its life cycle, and further ensuring the safety of the patient.

[0020] In other embodiments of the present invention, the operating hand wheel and the upper shell body can also be connected by a flat key or a screw; the latch structure can also be a limiting protrusion arranged on the inner wall of the spring mounting groove and a limiting groove arranged on the outer surface of the end of the limiting ring; the limiting ball in the button locking structure can also be replaced by a spring pin.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A needle-free syringe, comprising an upper and a lower shell, wherein the lower end of the lower shell is threadedly connected to an ampoule with micropores, and the upper and lower shells are threadedly connected; a push rod is arranged in the upper and lower shells, a main spring is arranged between the push rod and the upper shell, a mounting tube is arranged at the upper end of the upper shell, the push rod has a guide mounting section installed in the mounting tube, a button is arranged on the upper and lower movable sleeves of the outer wall of the mounting tube, a first annular groove is arranged on the guide mounting section of the push rod, and the push rod, the upper shell and the button together form a push rod locking structure through a first limiting ball and the first annular groove; a first annular groove is arranged on the inner wall of the button for releasing the lock of the push rod; a button reset spring is arranged between the button and the guide mounting section; the characteristics are as follows: An operating hand wheel is provided on the outside of the upper shell body, and a cylindrical mounting section is provided on the upper end of the operating hand wheel. The button is located in the cylindrical mounting section. A limiting collar is provided on the lower and upper guide movable sleeve on the outside of the cylindrical mounting section. A locking structure and a collar reset spring are provided between the limiting collar and the operating hand wheel. A button locking structure is provided between the cylindrical mounting section and the outer wall of the button. A button unlocking structure is provided on the inner wall of the limiting collar; an end cover is connected to the cylindrical mounting section above the limiting collar, and the end cover is used for limiting the position of the button. The button locking structure includes a second annular groove provided on the outer wall of the button, a tapered hole is provided on the cylindrical mounting section, and a second limiting ball is installed between the second annular groove and the tapered hole. The button unlocking structure includes a second annular groove provided on the inner wall of the limiting collar, and the locking structure includes an annular protrusion provided on the outer groove wall of the spring mounting groove. The lower end of the limiting collar has a hook that cooperates with the locking of the annular protrusion.

2. The needle-free injector according to claim 1, characterized in that: A spring installation groove for installing a sleeve ring reset spring is arranged between the operating hand wheel and the cylindrical installation section.

3. The needle-free injector according to claim 1, characterized in that: The limiting collar is provided with an anti-slip structure.

4. The needle-free injector according to any one of claims 1 to 3, characterized in that: The push rod also has a spring installation section, and the guide installation section and the spring installation section are connected via a threaded structure so that the length of the entire push rod can be adjusted.

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