Low-residual vaccine injector

Abstract

The utility model discloses a low residue vaccine syringe, including nipple, empty cylinder, first piston, first piston shaft and first piston handle, the first piston is provided with second piston hole that is coaxial with nipple's central hole, the diameter of second piston hole is equal to the diameter of nipple's central hole, and the diameter of second piston shaft is equal to the diameter of nipple's central hole. A second piston is embedded in the second piston hole, a second piston shaft relatively moving in the axial direction is arranged on the first piston handle in a penetrating mode, one end of the second piston shaft is connected to the second piston, and the other end of the second piston shaft is connected with a second piston handle; the first piston shaft is circumferentially distributed outside the second piston shaft, a guide block is connected to the first piston shaft in a sliding mode, and the second piston shaft is connected to the guide block. The injector has the advantages of being thorough in injection and free of residues, and is complete in overall function and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and more particularly to a low-residue vaccine syringe. Background Art

[0002] For vaccines with a small single injection volume, the entire syringe should be injected completely, leaving no residual fluid, otherwise the efficacy will be affected. Traditional vaccine syringes, after the piston is pushed to the end, still leave a small amount of residual fluid in the nipple, which cannot be completely drained, resulting in poor overall efficacy. Accordingly, the present invention proposes a low-residue vaccine syringe. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a low-residue vaccine syringe which has the characteristics of thorough injection and no residue.

[0004] In order to solve the above technical problems, the purpose of the present invention is achieved as follows: The present invention involves a low-residue vaccine syringe, comprising a nipple, an empty cylinder, a first piston, a first piston shaft and a first piston handle. The first piston is provided with a second piston hole coaxially arranged with the center hole of the nipple. The diameter of the second piston hole is equal to the diameter of the center hole of the nipple. A second piston is embedded in the second piston hole. The first piston handle is passed through a second piston shaft for relative axial movement. One end of the second piston shaft is connected to the second piston, and the other end is connected to the second piston handle.

[0005] The utility model is further configured as follows: the first piston shaft is circumferentially arranged outside the second piston shaft; a guide block is slidably connected to the first piston shaft; and the second piston shaft is connected to the guide block.

[0006] The utility model is further configured as follows: a first axial positioning groove and a second axial positioning groove are opened on the hole wall of the second piston hole, and an axial positioning protrusion arranged on the second piston is arranged in the second axial positioning groove or the first axial positioning groove.

[0007] The present invention is further configured such that: the distance between the first axial positioning groove and the second axial positioning groove is equal to the height of the nipple.

[0008] The present invention is further configured as follows: the diameter of the second piston shaft is not greater than the diameter of the second piston hole.

[0009] To sum up, the utility model has the following beneficial effects: the low-residue vaccine syringe involved in the utility model, after pushing the vaccine agent in the empty barrel, uses the second piston to extend into the center hole of the nipple to push out the residual liquid remaining in the nipple, so that the injection is thorough and residue-free, the overall function is perfect, and the practicality is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 It is a partial structural diagram of the utility model. DETAILED DESCRIPTION

[0012] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the patent claims of the present invention. Based on the examples in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0013] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0014] Example 1

[0015] See also Figure 1 and Figure 2 As shown, the low-residue vaccine syringe involved in this embodiment includes a nipple 1, an empty cylinder 2, a first piston 3, a first piston shaft 4 and a first piston handle 5. The first piston 3 is provided with a second piston hole 6 which is coaxial with the center hole of the nipple 1. The diameter of the second piston hole 6 is equal to the diameter of the center hole of the nipple 1. A second piston 7 is embedded in the second piston hole 6. The first piston handle 4 is passed through a second piston shaft 8 which moves axially relative to it. One end of the second piston shaft 8 is connected to the second piston 7, and the other end is connected to the second piston handle 9.

[0016] Furthermore, the first piston shaft 4 is arranged outside the second piston shaft 8 . A guide block 10 is slidably connected to the first piston shaft 4 , and the second piston shaft 8 is connected to the guide block 10 .

[0017] Furthermore, the diameter of the second piston shaft 8 is not greater than the diameter of the second piston hole 6 .

[0018] In this embodiment, the first piston handle 5 is pushed, which is transmitted via the first piston shaft 4, and the first piston 3 is further extended into the empty cylinder 2 until the bottom of the cylinder, pushing out the vaccine medicine remaining in the empty cylinder 2. Then, the second piston handle 9 is pushed, which is transmitted via the second piston shaft 8, and the second piston 7 extends out of the second piston hole 6 and into the center hole of the nipple 1, squeezing out the residual liquid remaining in the nipple 1, so that the injection is complete.

[0019] The guide block 10 is provided to guide the first piston shaft 4 when it moves axially.

[0020] Example 2

[0021] See also Figure 1 and Figure 2 As shown, the low-residue vaccine syringe involved in this embodiment is further configured on the basis of Example 1, wherein a first axial positioning groove 11 and a second axial positioning groove 12 are provided on the hole wall of the second piston hole 6, and an axial positioning protrusion 13 provided on the second piston 7 is provided in the second axial positioning groove 12 or the first axial positioning groove 11.

[0022] Furthermore, the distance between the first axial positioning groove 11 and the second axial positioning groove 12 is equal to the height of the nipple 1 .

[0023] In this embodiment, the combination of the first axial positioning groove 11 , the second axial positioning groove 12 and the axial positioning protrusion 13 plays a role in positioning the second piston 7 when it moves axially.

[0024] The low-residue vaccine syringe of the utility model uses a second piston to extend into the central hole of the nipple after pushing out the vaccine medicine in the empty cylinder to push out the residual liquid left in the nipple, so that the injection is thorough and residue-free, the overall function is perfect, and the practicality is strong.

[0025] Unless otherwise specified, in the present invention, if there are terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicating orientation or positional relationship, they are based on the orientation or positional relationship actually shown and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, they can combine the embodiments and understand the specific meanings of the above terms according to specific circumstances.

[0026] Unless otherwise specified or limited, the terms "disposed," "connected," and "connected" in this utility model should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A low-residue vaccine syringe comprising a nipple, an empty barrel, a first piston, a first piston shaft, and a first piston handle, characterized in that: The first piston is provided with a second piston hole coaxially arranged with the center hole of the nipple, the diameter of the second piston hole is equal to the diameter of the center hole of the nipple, a second piston is embedded in the second piston hole, and a second piston shaft is passed through the first piston handle for relative axial movement, one end of the second piston shaft is connected to the second piston, and the other end is connected to the second piston handle.

2. The low-residue vaccine syringe according to claim 1, characterized in that: The first piston shaft is circumferentially arranged outside the second piston shaft. A guide block is slidably connected to the first piston shaft, and the second piston shaft is connected to the guide block.

3. The low-residue vaccine syringe according to claim 1 or 2, characterized in that: A first axial positioning groove and a second axial positioning groove are formed on the wall of the second piston hole. An axial positioning protrusion provided on the second piston is provided in the second axial positioning groove or the first axial positioning groove.

4. The low-residue vaccine syringe according to claim 3, characterized in that: The distance between the first axial positioning groove and the second axial positioning groove is equal to the height of the nipple.

5. The low-residue vaccine syringe according to claim 1, characterized in that: The diameter of the second piston shaft is not greater than the diameter of the second piston hole.

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