Safety injector

Abstract

The utility model discloses a safety syringe, which belongs to the technical field of medical instruments, and comprises an empty cylinder, a piston shaft and a needle head, an empty cylinder wing is arranged at the edge of the rear end of the empty cylinder, an anti-drop structure is arranged on the empty cylinder wing, the anti-drop structure comprises a rotating shaft, one end of the rotating shaft is fixed on the empty cylinder wing, and the other end of the rotating shaft is fixed on the piston shaft; the shifting piece is rotationally arranged on the rotating shaft in a sleeving mode, and the two ends of the shifting piece form a telecentric end and a proximal end respectively. According to the safety type syringe, the piston shaft can be prevented from being disengaged from the empty cylinder through the anti-disengagement structure, and the safety type syringe is safe to use; the needle tip inclined plane is marked on the pintle, so that an operator can conveniently and quickly position the needle tip inclined plane; the rear end of the nipple is in threaded connection with the rear end of the pintle of the needle head, so that the needle head and the nipple are prevented from falling off and being separated in the medicine adding process, and meanwhile, the smooth front end of the nipple can be smoothly connected with the needle-free connector; the pintle wing is arranged on the pintle, so that the pintle can be conveniently held when the needle head is separated from the needle sleeve protective cap or the needle head is separated from an injector nipple.

Description

Technical Field

[0001] The utility model relates to a safety syringe and belongs to the technical field of medical equipment. Background Art

[0002] A syringe is a medical device used to extract and inject liquid medicine, including a hollow barrel, a piston shaft, a needle and other structures. The inventor of the present application found in the course of work that the existing syringe has the following problems that need to be improved:

[0003] (1) When the piston shaft is pulled outward, the liquid medicine is sucked into the empty cylinder. When the piston shaft is pulled out, a certain negative pressure is generated in the empty cylinder, so it is necessary to apply force to pull the piston shaft backward. If the force is too great, the piston shaft will be pulled out of the empty cylinder, causing the liquid medicine to spill out. Secondly, when the amount of liquid medicine to be sucked out is large, the distance the piston shaft is pulled outward is large, and it is also easy to pull the piston shaft directly out of the empty cylinder. Furthermore, in the process of adding medicine clinically, in order to smoothly extract all the liquid medicine in the medicine bottle, usually part of the liquid medicine is first extracted and then a certain amount of air is injected into the medicine bottle to maintain the pressure inside and outside the medicine bottle, so as to facilitate the extraction of all the remaining liquid medicine. However, this will cause the empty cylinder of the syringe to extract too much air and liquid medicine, resulting in excessive pressure in the empty cylinder. Under the dual effects of the pressure in the empty cylinder and the external suction force, the empty cylinder and the piston shaft will separate and fall off during the suction process, causing the liquid medicine to spill out.

[0004] (2) When using a syringe to inject drugs clinically, in certain specific injection situations, the needle tip bevel is required to be injected upward. For example, during the skin test, the needle is required to be inserted into the patient's subcutaneous tissue at a certain angle to the skin. At the same time, the needle tip bevel and the scale on the empty barrel need to be both upward and on the same horizontal plane to accurately control the dosage of the injected liquid during the injection process. In order to meet this requirement, the current clinical practice is usually to grasp the needle plug with the hand and adjust the needle tip bevel by visual identification. In this process, there are the following problems: First, because the needle plug is small, the hand is easy to touch the needle stem and nipple when holding it, resulting in contamination; second, because the needle tip bevel is small, it is difficult for the operator to determine the needle tip bevel, and it is often difficult to adjust the needle tip bevel in one go by visual identification.

[0005] (3) In existing syringes, the connection between the needle and the nipple is manually pressed and connected, and the connection is not tight. During the process of aspirating the drug solution, when the pressure in the bottle is too high or the operator's improper force is applied, the needle and the nipple often become loose and separated, causing the drug solution to spill or even spray out. This not only causes a waste of drug solution, but sometimes even causes occupational exposure to the operator due to the drug solution spraying onto the operator's skin or even mucous membranes such as the eyes, posing a safety hazard.

[0006] (4) In existing syringes, the needle plug has a small gripping contact surface and no structure for applying force. When the operator separates the needle from the needle cover or the nipple of the syringe, the small gripping surface is not convenient for applying force, making separation difficult. Secondly, when the operator separates the needle from the needle cover or the nipple, the needle plug has a small gripping surface, which makes it easy for the operator's hand to slip and touch the needle stem or the nipple of the syringe, increasing contamination during the aseptic operation process. The needle may even fall or the hand may slip during separation, resulting in a needlestick injury, posing a safety hazard.

[0007] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0008] In order to solve the problems existing in the prior art, the utility model provides a safe syringe which is time-saving and efficient in use.

[0009] The utility model achieves the above-mentioned purpose by adopting the following technical solutions:

[0010] A safety syringe comprises an empty barrel, a piston shaft and a needle; the front end of the empty barrel is provided with a nipple, and the rear end edge of the empty barrel is provided with an empty barrel wing; the front end of the piston shaft is provided with a piston, and the rear end of the piston shaft is provided with a piston handle; the needle comprises a needle stem and a needle plug arranged at the rear end of the needle stem, the front end of the needle stem is a needle tip bevel, and the needle plug is used to be sleeved on the nipple;

[0011] The hollow cylinder wing is provided with an anti-slip structure, and the anti-slip structure comprises:

[0012] A rotating shaft is coaxially arranged with the hollow cylinder, one end of the rotating shaft is fixed on the wing of the hollow cylinder, and a boss is arranged at the other end of the rotating shaft, and the outer diameter of the boss is larger than the outer diameter of the rotating shaft;

[0013] The paddle is rotatably sleeved on the rotating shaft, and the distances between the two ends of the paddle and the axis of the rotating shaft are unequal, so that the two ends of the paddle constitute a distal end and a proximal end respectively.

[0014] Preferably, a mounting hole is formed on the paddle, and a mounting notch communicating with the mounting hole is formed on a side wall of the mounting hole.

[0015] Preferably, the rear end of the outer wall of the nipple is provided with an external thread, the front end of the outer wall of the nipple is smooth, and the rear end of the inner wall of the pintle is provided with an internal thread matching the external thread.

[0016] Preferably, a pintle wing is provided at the rear end edge of the pintle.

[0017] Preferably, a bevel positioning mark is provided on the needle plug, and the bevel positioning mark and the needle tip bevel are located on the same side of the needle stem.

[0018] Preferably, the outer wall of the hollow cylinder is provided with scale marks.

[0019] Preferably, the cross section of the piston handle is a cross structure.

[0020] The beneficial effects of this application include but are not limited to:

[0021] The safety syringe provided by the utility model can prevent the piston shaft from falling out of the empty cylinder when sucking the medicine liquid by arranging the anti-falling structure, and is safe to use; by marking the position of the needle tip bevel on the needle plug, it is convenient for the operator to quickly locate the needle tip bevel, which is time-saving and efficient; by threading the rear end of the nipple with the rear end of the needle plug of the needle, it is prevented that the needle and the nipple fall off and separate during the dosing process, and at the same time, it is ensured that the smooth front end of the nipple can be smoothly connected to the needle-free connector; the needle plug wing is arranged on the needle plug for the convenience of the operator to hold it, and prevents the operator's hand from slipping when separating the needle, causing the needle to fall off or contact the needle stem and the nipple on the syringe, thereby reducing the occurrence of contamination and needle stick injuries during the aseptic operation, and having high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 A schematic diagram of a safety syringe provided by the utility model;

[0024] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0025] Figure 3 It is a schematic diagram of an empty barrel, a needle and an anti-drop structure, wherein the distal end of the paddle is located on the moving path of the piston;

[0026] Figure 4 for Figure 1 Enlarged view of middle part B;

[0027] Figure 5 It is a schematic diagram of an empty barrel, a needle and an anti-drop structure, wherein the distal end of the paddle leaves the moving path of the piston;

[0028] Figure 6 for Figure 5 Enlarged view of the middle C part;

[0029] Figure 7 It is a schematic diagram of the anti-slip structure;

[0030] Figure 8 is a schematic diagram of an empty cylinder;

[0031] Fig. 9 for Figure 8 Enlarged view of the middle D part;

[0032] Fig.10 is a schematic diagram of a needle;

[0033] Fig.11 for Fig.10 Enlarged view of the middle E part;

[0034] Fig.12 A schematic diagram of the needle tip bevel and bevel positioning marks on the needle;

[0035] In the figure, 100, empty cylinder; 110, nipple; 111, external thread; 120, empty cylinder wing;

[0036] 200, piston shaft; 210, piston; 220, piston handle;

[0037] 300, needle tip; 310, needle stem; 311, needle tip bevel; 320, needle bolt; 321, internal thread; 322, needle bolt wing;

[0038] 410, rotating shaft; 411, boss; 420, paddle; 421, distal end; 422, proximal end; 430, mounting hole; 431, mounting notch; 400, inclined surface positioning mark. DETAILED DESCRIPTION

[0039] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0040] It should be noted that many specific details are described in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0041] like Figure 1-12 As shown in , the safety syringe provided by the utility model comprises an empty barrel 100, a piston shaft 200 and a needle 300. Specifically, the front end of the empty barrel 100 is provided with a nipple 110, and the rear end edge of the empty barrel 100 is provided with an empty barrel wing 120; the front end of the piston shaft 200 is provided with a piston 210, and the rear end of the piston shaft 200 is provided with a piston handle 220; the needle 300 comprises a needle stem 310 and a needle plug 320 arranged at the rear end of the needle stem 310, the front end of the needle stem 310 is a needle tip bevel 311, and the needle plug 320 is used to be sleeved on the nipple 110.

[0042] The front end is the direction of the pointer tip, and the rear end is the direction of the piston handle 220 .

[0043] Compared with conventional syringes, the utility model is provided with an anti-dropout structure on the empty barrel wing, and the anti-dropout structure includes:

[0044] A rotating shaft 410 is coaxially arranged with the hollow cylinder 100, one end of the rotating shaft 410 is fixed on the hollow cylinder wing 120, and a boss 411 is arranged at the other end of the rotating shaft 410, and the outer diameter of the boss 411 is larger than the outer diameter of the rotating shaft 410;

[0045] The paddle 420 is rotatably sleeved on the rotating shaft 410 , and the distances between the two ends of the paddle 420 and the axis of the rotating shaft 410 are unequal, so that the two ends of the paddle 420 respectively constitute a distal end 421 and a proximal end 422 .

[0046] The outer diameter of the piston 210 is greater than the outer diameter of the piston shaft 200. Figure 2 , Figure 3 and Figure 4 As shown in , when the distal end 421 rotates around the rotating shaft 410 to the upper part of the inner cavity of the empty cylinder 100, it will block the upward movement path of the piston 210, thus preventing the piston 210 from being pulled out of the empty cylinder 100 along with the piston shaft 200. Figure 5 and Figure 6 As shown in , when the distal end 421 rotates around the rotating shaft 410 and leaves the top of the inner cavity of the empty cylinder 100, the piston 210 can move out of the empty cylinder 100 along with the piston shaft 200 because the proximal end 422 cannot block the upward movement path of the piston 210.

[0047] During actual production, the lengths of the proximal end 422 and the distal end 421 are determined by comprehensively considering the distance between the installation position of the rotating shaft 410 and the inner cavity edge of the hollow cylinder 100 .

[0048] Usually, the rotating shaft 410, the boss 411 and the hollow cylinder 100 are integrally formed. After the paddle 420 is sleeved on the rotating shaft 410, it can rotate freely around the rotating shaft 410, and the boss 411 can prevent the paddle 420 from falling off the rotating shaft 410.

[0049] like Figure 7 As shown in , in order to facilitate the installation of the paddle 420, in a preferred embodiment, a mounting hole 430 is provided on the paddle 420, and a mounting notch 431 communicating with the mounting hole 430 is provided on the side wall of the mounting hole 430. When installing the paddle 420, pinch the two sides of the mounting notch 431 and pull them outward to expand the mounting hole 430, and then put the paddle 420 on the rotating shaft 410; after loosening, the paddle 420 is installed to restore its deformation, and the mounting hole 430 is restored to its original size, and then the paddle 420 can be put on the rotating shaft 410.

[0050] like Figure 8 and Fig. 9 As shown in , in one specific embodiment, the rear end of the outer wall of the nipple 110 is provided with an external thread 111; Fig.10 and Fig.11 As shown in the figure, the inner wall rear end of the needle plug 320 is provided with an inner thread 321 that matches the outer thread 111, so that the needle 300 is tightly connected to the nipple 110 through the thread to prevent the needle 300 from falling off. The front end of the outer wall of the nipple 110 is smooth, and the front end of the nipple 110 can be smoothly connected to the needleless connector during intravenous injection. Although some patents disclose the threaded connection between the needle and the nipple, the threads are distributed on the entire outer wall of the nipple, resulting in the nipple cannot be used for intravenous injection on the needleless connector, and the clinical practicality is not high.

[0051] like Fig.10 As shown in , in another specific embodiment, the rear edge of the needle plug 320 is provided with a needle plug wing 322, which is convenient for holding when separating the needle, and prevents the operator's hand from slipping when separating the needle, causing the needle to fall or contact the needle stem and the nipple on the syringe, thereby reducing the occurrence of contamination and needle stick injuries during aseptic operation, and having high safety. Specifically, the needle plug wing 322 can adopt a square or arc structure.

[0052] like Fig.12 As shown in , in another specific embodiment, a bevel positioning mark 400 is provided on the needle plug 320, and the bevel positioning mark 400 and the needle tip bevel 311 are located on the same side of the needle stem 310, which facilitates the operator to quickly locate the needle tip bevel, saving time and efficiency. Specifically, the bevel positioning mark 400 can be a shape mark or a convex dot mark.

[0053] The safety syringe provided by the utility model is an improvement on a conventional syringe. Usually, the outer wall of the empty barrel 100 is provided with a scale mark, and the cross section of the piston handle 220 is a cross structure.

[0054] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The above specific implementation manner cannot be used as a limitation on the protection scope of the utility model. For technicians in this technical field, any replacement, improvement or transformation made to the implementation manner of the utility model falls within the protection scope of the utility model.

[0057] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A safety syringe, comprising an empty barrel, a piston shaft and a needle; the front end of the empty barrel is provided with a nipple, and the rear end edge of the empty barrel is provided with an empty barrel wing; the front end of the piston shaft is provided with a piston, and the rear end of the piston shaft is provided with a piston handle; the needle comprises a needle stem and a needle plug arranged at the rear end of the needle stem, the front end of the needle stem is a needle tip bevel, and the needle plug is used to be sleeved on the nipple; characterized in that: The hollow cylinder wing is provided with an anti-slip structure, and the anti-slip structure comprises: A rotating shaft is coaxially arranged with the hollow cylinder, one end of the rotating shaft is fixed on the wing of the hollow cylinder, and a boss is arranged at the other end of the rotating shaft, and the outer diameter of the boss is larger than the outer diameter of the rotating shaft; The paddle is rotatably sleeved on the rotating shaft, and the distances between the two ends of the paddle and the axis of the rotating shaft are unequal, so that the two ends of the paddle constitute a distal end and a proximal end respectively.

2. The safety syringe according to claim 1, characterized in that: The plectrum is provided with a mounting hole, and a side wall of the mounting hole is provided with a mounting notch communicated with the mounting hole.

3. The safety syringe according to claim 1, characterized in that: The rear end of the outer wall of the nipple is provided with an external thread, the front end of the outer wall of the nipple is smooth, and the rear end of the inner wall of the pintle is provided with an internal thread matched with the external thread.

4. The safety syringe according to claim 1, characterized in that: The rear end edge of the pintle is provided with a pintle wing.

5. The safety syringe according to claim 1, characterized in that: The needle plug is provided with a bevel positioning mark, and the bevel positioning mark and the needle tip bevel are located on the same side of the needle stem.

6. The safety syringe according to claim 1, characterized in that: The outer wall of the empty cylinder is provided with a scale mark.

7. The safety syringe according to claim 1, characterized in that: The cross section of the piston handle is a cross structure.

Images