Needleless injection device

Abstract

The utility model provides a needleless injection device. The needleless injection device comprises a pressurizing box and an injector arranged in the pressurizing box, the pressurizing box comprises an upper shell, a lower shell and an ejector pin, the upper shell and the lower shell are rotationally connected, the ejector pin is slidably arranged on the lower shell, the ejector pin is connected with the upper shell through a connecting rod, and the connecting rod is driven to move when the upper shell rotates so as to drive the ejector pin to slide back and forth in the lower shell; the injector comprises a key, a striking block, a spring and a lever, the striking block is sleeved with the spring and located in front of the displacement path of the ejector pin, when the ejector pin moves to push the striking block to move backwards, the striking block compresses the spring till the striking block is limited by the rear end of the lever, and the key for triggering the front end of the lever to move downwards is arranged at the front end of the lever. The needleless injector pressurizing device can rapidly pressurize a needleless injector in a labor-saving mode, and helps a patient to effectively shorten the whole injection using process.

Description

Technical Field

[0001] The utility model relates to the field of needle-free injection, in particular to a needle-free injection device. Background Art

[0002] Needle-free injection is an injection method that does not use a traditional capillary needle. It does not require a needle to pierce the flesh. Instead, a needle-free injection pusher generates a certain amount of pressure through a mechanically stable annular compression spring system. Under the action of pressure, the drug solution is pushed and diffusely injected into the patient's subcutaneous tissue. Therefore, it will also reduce the pain and fear of needle pricking the flesh of patients to a certain extent.

[0003] However, the pressurization process of existing needle-free injections is often too time-consuming and labor-intensive, so the user experience is not very good. Utility Model Content

[0004] In view of this, the utility model provides a needle-free injection device, which can realize fast and labor-saving pressurization of the needle-free syringe, helping patients to effectively shorten the entire injection process.

[0005] A needle-free injection device comprises a pressurized box and a syringe for being placed in the pressurized box; the pressurized box comprises a rotatably connected upper shell, a lower shell, and a thimble slidably arranged in the lower shell, the thimble being connected to the upper shell via a connecting rod, and when the upper shell rotates, the connecting rod is driven to move, thereby driving the thimble to slide back and forth in the lower shell; the syringe comprises a button, a striking block, a spring, and a lever, the spring being sleeved on the striking block, the striking block being located in front of the displacement path of the thimble, and when the thimble moves to push the striking block backward, the striking block compresses the spring until the striking block is limited by the rear end of the lever, and the front end of the lever is provided with a button for triggering the front end of the lever to move downward.

[0006] Furthermore, the upper shell and the lower shell are connected via a fixed rotating shaft, and the upper shell can rotate around the fixed rotating shaft.

[0007] Furthermore, a fixed slide is provided in the lower shell, and the ejector pin is slidably arranged in the fixed slide.

[0008] Furthermore, a lock tongue is provided on one side of the button for limiting the button, and the lock tongue is driven to move by the safety switch. When the safety switch drives the lock tongue to move to release the limit of the button, the button is pressed downward to move the front end of the lever downward, thereby causing the rear end of the lever to tilt up and release the striking block.

[0009] The upper shell and the lower shell of the pressurizing box of the utility model are rotatably connected to form a lever structure. The upper shell is connected to the ejector pin by a connecting rod. The opening and closing of the pressurizing box is used to make the ejector pin move back and forth through the connecting rod. The back and forth movement of the ejector pin pushes the striking block inside the syringe, and the striking block then pushes the spring to complete the compression of the spring, so that its structure achieves the purpose of labor saving and rapid pressurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of the pressurized box in the present invention when it is closed;

[0011] Figure 2 This is a schematic diagram of the structure of the pressurized box when it is opened in the utility model;

[0012] Figure 3 This is a schematic structural diagram of the syringe in the present invention when it is in a stationary state;

[0013] Figure 4 This is a schematic structural diagram of the striking block of the syringe in the present invention when it is in a compressed state;

[0014] Figure 5 This is a schematic diagram of the structure of the present invention after the syringe is placed in the pressurized box;

[0015] Figure 6 It is a structural diagram of the utility model when the pressurizing box moves to push the striking block.

[0016] The reference numerals in the figure are described as follows: 1—pressurizing box, 11—upper shell, 12—upper shell, 13—fixed shaft, 14—thimble, 15—fixed slide, 16—connecting rod; 2—syringe, 21—lock tongue, 22—button, 23—strike block, 24—spring, 25—lever, 26—safety switch. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0018] See also Figure 1-6 An embodiment of the present invention provides a needle-free injection device, comprising a pressurized box 1 and a syringe 2.

[0019] like Figure 1 As shown, the pressurized box 1 includes an upper shell 11, a lower shell 12, a fixed rotating shaft 13, an ejector pin 14, a fixed slide 15 and a connecting rod 16. The upper shell 11 and the lower shell 12 are connected by the fixed rotating shaft 13. The upper shell 11 can rotate around the fixed rotating shaft 13 by a certain angle. The upper shell 11 is connected to the ejector pin 14 through the connecting rod 16. The fixed slide 15 is provided on the lower shell 12, and the ejector pin 14 is slidably provided in the fixed slide 15.

[0020] like Figure 2 As shown, the upper shell 11 is opened by the fixed shaft 13 and rotated to a certain angle, driving the connecting rod 16 to move backward, thereby driving the ejector pin 14 to move backward. Conversely, when the upper shell 11 and the lower shell 12 are closed, the connecting rod 16 is driven to move forward, thereby driving the ejector pin 14 to move forward.

[0021] like Figure 3 As shown, the syringe 2 includes a locking tongue 21, a button 22, a striking block 23, a spring 24, a lever 25 and a safety switch 26. The syringe 2 is used to be placed in the pressurized box 1. The spring 24 is sleeved on the striking block 23, and the striking block 23 is located in front of the displacement path of the ejector 14. The lever 25 is located above the striking block 23. When the ejector 14 moves and pushes the striking block 23 backward, the striking block 23 compresses the spring 24 until the striking block 23 is limited by the rear end of the lever 25. The front end of the lever 25 is provided with a button 22. The button 22 can be pressed downward to move the front end of the lever 25 downward, thereby causing the rear end of the lever 25 to tilt and release the striking block 23.

[0022] A locking tongue 21 is provided on one side of the button 22. The locking tongue 21 is driven to move by a safety switch 26. In the initial position, the locking tongue 21 presses against the button 22, preventing it from being pressed down. In other words, the locking tongue 21 limits the position of the button 22. At this time, when the button 22 is pressed down, the locking tongue 21 cannot drive the lever 25 to release the striking block 23 due to the position limit. When the safety switch 26 is pushed to remove the locking tongue 21, the button 22 can be pressed down, driving the lever 25 to release the striking block 23.

[0023] like Figure 3 As shown, the syringe 2 is in a static state at this time, and the lock tongue 21 presses against the button 22 so that the button 22 cannot be pressed down. Figure 5 As shown), the upper shell 11 is closed to drive the connecting rod 16 and the ejector pin 14 to move forward and push the striking block 23 (as shown). Figure 6 As shown), the spring 24 is compressed. After the spring 24 is compressed, the striking block 23 is stuck by the lever 25 so that the spring 24 is always in a compressed state (as shown). Figure 4 (As shown). Toggling safety switch 26 backward moves lock tongue 21 backward, pressing button 22 downward, which contacts the front end of lever 25, causing the rear end of lever 25 to lift. Once lever 25 is lifted, striking block 23 is unobstructed, and spring 24 instantly expands, pushing striking block 23 forward.

[0024] The upper shell 11 and lower shell 12 of the pressurized cartridge 1 of the present invention form a lever structure via a fixed rotating shaft 13. The upper shell 11 is connected to the ejector pin 14 via a connecting rod 16. The opening and closing of the pressurized cartridge 1 causes the ejector pin 14 to move back and forth via the connecting rod 16. This forward and backward movement of the ejector pin 14 pushes the striking block 23 inside the syringe 2, which in turn pushes the spring 14 to compress it, achieving the goal of labor-saving and rapid pressurization.

[0025] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A needle-free injection device, characterized in that: It includes a pressurized box and a syringe for being placed in the pressurized box; the pressurized box includes a rotatably connected upper shell, a lower shell, and a thimble slidably arranged on the lower shell, the thimble is connected to the upper shell by a connecting rod, and when the upper shell rotates, it drives the connecting rod to move, and then drives the thimble to slide back and forth in the lower shell; the syringe includes a button, a striking block, a spring, and a lever, the spring is sleeved on the striking block, and the striking block is located in front of the displacement path of the thimble. When the thimble moves and pushes the striking block to move backward, the striking block compresses the spring until the striking block is limited by the rear end of the lever, and the front end of the lever is provided with a button for triggering the front end of the lever to move downward.

2. The needle-free injection device according to claim 1, wherein: The upper shell and the lower shell are connected via a fixed rotating shaft, and the upper shell can rotate around the fixed rotating shaft.

3. The needle-free injection device according to claim 1, wherein: A fixed slideway is provided in the lower shell, and the ejector pin is slidably arranged in the fixed slideway.

4. The needle-free injection device according to claim 1, wherein: A lock tongue is provided on one side of the button for limiting the button. The lock tongue is driven to move by the safety switch. When the safety switch drives the lock tongue to move to release the limit of the button, the button is pressed downward to move the front end of the lever downward, thereby causing the rear end of the lever to tilt up and release the striking block.

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