Injector for teaching

Abstract

The utility model provides an injector for teaching, which comprises a needle cylinder composed of a cylinder body, a push rod, a rotating cylinder, a piston and an end cover. A liquid storage cavity is formed in the cylinder body, and the rotating cylinder is rotationally connected with the cylinder body; the end cover is mounted at the top end of the rotary drum; a through hole is formed in the center of the end cover; the piston comprises a chock plug, a stud and a connector, the bottom end of the connector is fixedly connected with the top end of the stud, and the top end of the chock plug is fixedly connected with the bottom end of the stud; the side wall of the chock plug is in sliding connection with the inner wall of the liquid storage cavity; a piston cavity is formed in the rotary drum, and the inner wall of the piston cavity is in threaded connection with the stud; comprising a needle, and the bottom end of the needle is inserted into a connector; an axial channel is arranged in the piston, one end of the axial channel is communicated with the needle head, and the other end of the axial channel is communicated with the liquid storage cavity. The technical problems that in the prior art, liquid extraction injection and needle head assembly cannot be practiced, storage is not safe, and a needle head is prone to retraction in the puncture process are solved.

Description

Technical Field

[0001] This utility model relates to the field of human daily necessities, and more particularly to medical teaching devices, especially a teaching syringe. Background Technology

[0002] Nurses need to practice a lot when learning injections, usually using real disposable syringes. However, during the learning process, nurses often carry the syringes with them to their homes or dormitories. Because it is inconvenient to store the needles, they usually disassemble them before carrying them, which generates a lot of medical sharps waste. Novice nurses often find it difficult to handle medical sharps waste according to the relevant regulations, which can easily lead to accidental needlestick injuries to nurses or sanitation workers.

[0003] There are similar teaching syringes in the prior art, such as the Chinese patent CN219958414U which discloses a teaching hidden needle syringe, but such syringes still have the following problems:

[0004] 1. It lacks real fluid aspiration and injection capabilities, making it impossible to practice fluid aspiration and injection.

[0005] 2. Without using disposable needles, it is difficult to practice assembly using real needles;

[0006] 3. The slide rail is not securely fixed, which makes it easy for the needle to accidentally extend during storage, making storage unsafe;

[0007] 4. The groove tends to retract during puncture, resulting in poor reliability. Summary of the Invention

[0008] The purpose of this invention is to provide a teaching syringe that solves the technical problems in the prior art, such as the inability to practice liquid aspiration and injection, needle assembly, unsafe storage, and easy needle retraction during puncture.

[0009] A teaching syringe includes a syringe barrel comprising a barrel body, a plunger, a rotating cylinder, a piston, and an end cap. The barrel body has a liquid reservoir, the top end of the plunger is disposed within the liquid reservoir, and the bottom end of the plunger passes through the bottom end of the barrel body and is disposed outside the barrel body. An annular guide rail is provided at the top end of the barrel body, and an annular guide rail groove is formed at the bottom end of the rotating cylinder. The annular guide rail is slidably connected within the annular guide rail groove, thereby allowing the rotating cylinder to be rotatably connected to the barrel body. The end cap is mounted on the top end of the rotating cylinder, and a through hole is formed at the center of the end cap. The piston includes a stopper, a stud, and a connecting element. The device comprises a connector, the bottom end of which is fixedly connected to the top end of the stud, and the top end of the plug head is fixedly connected to the bottom end of the stud; the side wall of the plug head is slidably connected to the inner wall of the liquid storage chamber, and the bottom end of the plug head is in contact with the top end of the push rod; a piston chamber is coaxially arranged inside the rotating cylinder, and the inner wall of the piston chamber is threadedly connected to the stud; a needle head is included, the bottom end of which is inserted into the connector; an axial channel is provided inside the piston, one end of which communicates with the needle head, and the other end of which communicates with the liquid storage chamber; the length of the needle head is less than the axial length of the piston chamber.

[0010] Furthermore, a piston cavity thread is provided at the bottom end of the inner wall of the piston cavity, and the piston cavity is connected to the stud thread through the piston cavity thread. A limiting flange is provided at the edge of the top end of the stud, and the bottom of the limiting flange abuts against the top of the piston cavity thread.

[0011] Furthermore, a cap is installed on the through hole.

[0012] Furthermore, the outer surface of the rotating drum is provided with anti-slip texture.

[0013] The working principle of this utility model:

[0014] The piston chamber inside the rotating cylinder is connected to the piston by a bolt thread. By rotating the rotating cylinder by hand, the piston can move up and down inside the piston chamber, thereby allowing the needle on the top of the piston to protrude or hide from the through hole of the end cap, achieving the effect of hiding the needle and making it convenient to carry the syringe.

[0015] An axial channel is provided inside the piston. One end of the axial channel is connected to the needle, and the other end is connected to the liquid storage chamber inside the cylinder, thereby simulating the real liquid aspiration and injection process.

[0016] Compared with existing technologies, the advantages of this invention are positive and obvious:

[0017] 1. The liquid storage chamber of this utility model is connected to the needle through an axial channel, thereby simulating the real functions of liquid aspiration and injection.

[0018] 2. The needle of this utility model is installed on the connector head, thereby simulating the assembly of a real needle.

[0019] 3. This utility model uses the rotation of the rotating drum to drive the piston down, thereby hiding the needle in the piston chamber, and using the friction between the stopper and the inner wall of the liquid storage chamber to prevent the piston from rising, thus achieving safe storage of the needle.

[0020] 4. This utility model uses the rotation of the rotating drum to drive the piston to rise, simulating real puncture training, and uses the friction between the stopper and the inner wall of the liquid storage chamber to prevent the piston from falling down, thus preventing the needle from retracting during puncture. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of an embodiment of this utility model.

[0022] Figure 2 A cross-sectional structural diagram of the needle when it extends in an embodiment of this utility model.

[0023] Figure 3 A cross-sectional structural diagram of the needle retracting in an embodiment of this utility model.

[0024] Figure 4 A partially enlarged structural diagram of the syringe in an embodiment of this utility model.

[0025] In the figure: 1 cylinder body; 101 liquid storage chamber; 2 rotating cylinder; 201 piston chamber; 202 piston chamber thread; 3 end cap; 301 through hole; 4 needle; 5 push rod; 6 annular guide rail; 7 piston; 701 axial channel; 702 stud; 703 plug; 704 connector; 705 limiting flange. Detailed Implementation

[0026] The following embodiments will further illustrate the present invention, but are not intended to limit the present invention.

[0027] like Figures 1 to 4 As shown, this embodiment provides a teaching syringe, including a syringe barrel, which consists of a barrel body 1, a push rod 5, a rotating barrel 2, a piston 7, and an end cap 3.

[0028] The barrel 1 is made of medical transparent plastic. The barrel 1 has a liquid storage chamber 101 inside. The plunger 5 is installed inside the barrel 1. The top end of the plunger 5 is located inside the liquid storage chamber 101, and the bottom end of the plunger 5 passes through the bottom end of the barrel 1 and is located outside the barrel 1. The plunger 5 is the same as the plunger of a conventional disposable syringe. One end is a rubber stopper and the other end is a plunger plate. It is used to draw the liquid into the liquid storage chamber 101 or to push the liquid in the liquid storage chamber 101 out of the needle 4.

[0029] A ring-shaped guide rail 6 is fixed to the top of the cylinder body 1. The cross-section of the ring-shaped guide rail 6 is T-shaped. A ring-shaped guide rail groove 203 matching the ring-shaped guide rail 6 is opened at the bottom of the rotating cylinder 2. The cylinder body 1, rotating cylinder 2, ring-shaped guide rail 6 and ring-shaped guide rail groove 203 are all coaxially arranged. The ring-shaped guide rail 6 is slidably connected in the groove of the ring-shaped guide rail groove 203, thereby realizing the effect of rotating cylinder 2 and cylinder body 1 being rotatably connected. The outer surface of the rotating cylinder 2 is densely covered with vertical anti-slip textures, making it easier to manually rotate the rotating cylinder 2.

[0030] End cap 3 is installed on the top of rotating drum 2 to seal it. The bottom edge of end cap 3 is threaded to the top edge of rotating drum 2, facilitating disassembly and maintenance in case of malfunction or needle breakage. A through hole 301 is provided in the center of end cap 3, through which needle 4 can protrude. A sealing cap is inserted on the through hole 301 to seal it and prevent dust from entering the interior of rotating drum 2 and causing contamination.

[0031] The piston 7 consists of three parts: a plug head 703, a stud 702, and a connector 704. The connector 704 is fixed to the top of the stud 702, and the plug head 703 is fixed to the bottom of the stud 702. The plug head 703, the stud 702, and the connector 704 are coaxially arranged, and an axial channel is provided between the plug head 703, the stud 702, and the connector 704.

[0032] An inner coaxial piston chamber 201 is provided, and the inner wall of the piston chamber 201 is threadedly connected to the stud 702. Specifically, a piston chamber thread 202 is provided at the bottom end of the inner wall of the piston chamber 201, which engages with the thread on the stud 702. This allows the rotating drum 2 to drive the stud 702 to rise and fall, thereby driving the piston 7 to rise and fall. In addition, a limiting flange 705 is provided at the top edge of the stud 702. The piston chamber thread 202 cannot engage with the limiting flange 705. The stud 702 descends to the bottom of the limiting flange 705 and abuts against the top of the piston chamber thread 202, thus preventing the stud 702 from falling out of the piston chamber 201 if it descends too low, achieving a limiting effect. The rotating drum and the stud 702 constitute a screw drive mechanism, which can prevent the needle 4 from retracting during puncture.

[0033] The stopper 703 is made of rubber. The side wall of the stopper 703 is slidably connected to the inner wall of the liquid storage chamber 101, and the stopper 703 is sealed to the inner wall of the liquid storage chamber 101.

[0034] When the plunger 5 is pushed to the bottom, the bottom end of the stopper 703 and the top end of the plunger 5 come into contact with each other in the liquid reservoir 101, which is similar to the feeling of the plunger 5 of a real disposable syringe being pushed to the bottom of the syringe, simulating the real injection feeling.

[0035] Includes needle 4, which is a real, universal disposable needle 4. The bottom end of needle 4 is inserted into connector 704, which is the same as the installation method of a universal disposable syringe, thereby simulating the assembly effect of a real needle 4 and facilitating needle 4 assembly training.

[0036] One end of the axial channel 701 is connected to the needle 4, and the other end of the axial channel 701 is connected to the reservoir 101. Pushing the push rod 5 can push the liquid in the reservoir 101 out of the needle 4 through the axial channel 701. Conversely, pulling the push rod 5 can also draw the liquid from the needle 4 into the reservoir 101 through the axial channel 701, thereby simulating the real injection and aspiration effect and facilitating injection and aspiration training.

[0037] It should be noted that the length of the disposable needle 4 must be less than the axial length of the piston chamber 201, so as to prevent the tip of the needle 4 from being exposed when the piston 7 is lowered to its lowest position, and the through hole 301 of the end cap 3 cannot completely hide the needle 4.

[0038] How to use this embodiment:

[0039] Rotate the outer wall of the rotating drum 2 by hand. The rotating drum 2 drives the piston 7 to rise until the connector 704 extends out from the through hole 301 of the end cover 3. The top of the stud 702 abuts against the end cover 3. Install the universal disposable needle 4 on the connector 704 to realize the installation training of the needle 4. Push and pull the push rod 5 to realize the liquid aspiration and injection training.

[0040] Rotate the outer wall of the rotating cylinder 2 in the opposite direction again by hand. The rotating cylinder 2 drives the piston 7 to descend until the needle tip is completely submerged in the through hole 301 of the end cap 3. The needle 4 is then stored in the piston cavity 201 to hide the needle 4, making it easy to carry.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A syringe for teaching purposes, characterized in that: Includes a syringe, which is composed of a syringe body (1), a push rod (5), a rotating cylinder (2), a piston (7), and an end cap (3); The cylinder body (1) is provided with a liquid storage chamber (101) inside. The top end of the push rod (5) is located in the liquid storage chamber (101), and the bottom end of the push rod (5) passes through the bottom end of the cylinder body (1) and is located outside the cylinder body (1). The top end of the cylinder body (1) is provided with an annular guide rail (6), and the bottom end of the rotating cylinder (2) is provided with an annular guide rail groove (203). The annular guide rail (6) is slidably connected in the annular guide rail groove (203), thereby making the rotating cylinder (2) rotatably connected to the cylinder body (1). The end cap (3) is installed on the top of the rotating drum (2), and a through hole (301) is provided in the center of the end cap (3); The piston (7) includes a plug (703), a stud (702), and a connector (704). The bottom end of the connector (704) is fixedly connected to the top end of the stud (702), and the top end of the plug (703) is fixedly connected to the bottom end of the stud (702). The side wall of the plug (703) is slidably connected to the inner wall of the liquid storage chamber (101), and the bottom end of the plug (703) is in contact with the top end of the push rod (5). A piston chamber (201) is coaxially arranged inside the rotating cylinder (2), and the inner wall of the piston chamber (201) is threadedly connected to the stud (702). Includes a needle (4), the bottom end of which is inserted into the connector (704); the piston (7) is provided with an axial channel (701), one end of which is connected to the needle (4), and the other end of which is connected to the liquid storage chamber (101); the length of the needle (4) is less than the axial length of the piston chamber (201).

2. The teaching syringe according to claim 1, characterized in that: A piston cavity thread (202) is provided at the bottom end of the inner wall of the piston cavity (201). The piston cavity (201) is threadedly connected to the stud (702) through the piston cavity thread (202). A limiting flange (705) is provided at the edge of the top end of the stud (702). The bottom of the limiting flange (705) abuts against the top of the piston cavity thread (202).

3. The teaching syringe according to claim 1, characterized in that: A cover is installed on the through hole (301).

4. A teaching syringe according to claim 1, characterized in that: The outer surface of the rotating drum (2) is provided with anti-slip texture.

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