A new type of disposable prefilled automatic injection pen

Abstract

The utility model relates to an injection pen, in particular to a novel disposable prefilled automatic injection pen, which belongs to the technical field of medical equipment. The utility model comprises a liquid storage cylinder, one end of which is fixed with an injection needle, a circular partition baffle and a first piston are installed on the inner wall of the liquid storage cylinder, the circular partition baffle is fixed in the liquid storage cylinder, the first piston is slidably clamped in the liquid storage cylinder, injection liquid is prefilled between the first piston and the injection needle, a sealed cavity is formed between the first piston and the circular partition baffle, a second piston is slidably clamped in the liquid storage cylinder, a propulsion liquid is prefilled between the second piston and the circular partition baffle, and the propulsion liquid is connected with the sealed cavity through a connecting pipe; the utility model can buffer the propulsion of the injection liquid, solves the problem that when the existing injection pen is directly driven by a spring, the propulsion force changes with the change of the spring elastic force, and effectively improves the comfort and practicality of the injection pen.

Description

Technical Field

[0001] The utility model relates to a novel disposable prefilled automatic injection pen, belonging to the technical field of medical equipment. Background Art

[0002] An injection pen is a device used to inject medications subcutaneously, designed to make injectable medications easier and more convenient to use, thereby improving patient compliance. The main difference between an injection pen and traditional vial and syringe medication administration is that an injection pen is easier to use for people with poor dexterity, poor eyesight, or a need for portability in order to administer medications on time. An injection pen also reduces the fear or adversity of self-injecting medications, which increases the likelihood that a person will take the medication. Most existing injection pens have an automatic injection function. An automatic injection pen is a compressed spring that gradually extends, pushing a piston to push the injection fluid into the human body's subcutaneous tissue to achieve automatic injection. However, in the process of gradual extension of the spring, the elastic force of the spring gradually decreases, which causes the injection fluid to be pushed gradually less force, causing discomfort to the patient and easily resulting in waste of the injection fluid. There are certain disadvantages in the use process.

[0003] In view of this, a novel disposable prefilled automatic injection pen is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a novel disposable prefilled automatic injection pen in order to solve the above-mentioned problems, which has the function of pushing the injection liquid into the human body evenly, and effectively improves the comfort and practicality of the use of the injection pen.

[0005] The utility model achieves the above-mentioned purpose through the following technical scheme: a novel disposable prefilled automatic injection pen, comprising a liquid storage cylinder, an injection needle is fixed at one end of the liquid storage cylinder, a circular partition baffle and a first piston are installed on the inner wall of the liquid storage cylinder, the circular partition baffle is fixed in the liquid storage cylinder, the first piston is slidably clamped in the liquid storage cylinder, injection liquid is prefilled between the first piston and the injection needle, a sealed cavity is formed between the first piston and the circular partition baffle, a second piston is also slidably clamped in the liquid storage cylinder, a propellant liquid is prefilled between the second piston and the circular partition baffle, and the propellant liquid is connected to the sealed cavity through a connecting tube.

[0006] Furthermore, in order to drive the circular connecting plate and the second piston to slide in the liquid storage cylinder through the thrust spring, a circular connecting plate is fixedly installed on the top of the second piston, and the circular connecting plate is slidably clamped in the liquid storage cylinder. A mounting sleeve is fixed on the top of the liquid storage cylinder, and the circular connecting plate is connected to the inner wall of the top side of the mounting sleeve through the thrust spring.

[0007] Furthermore, in order to limit the circular connecting plate by controlling the locking start component, a mounting hole groove is opened on the side wall on the top side of the liquid storage cylinder, and the locking start component is installed in the mounting hole groove, and one end of the locking start component is located at the bottom of the circular connecting plate.

[0008] Furthermore, in order to enable the rotating locking block to rotate on the rotating mounting rod by controlling the push-to-start twist, the locking starting assembly includes a fixed plate and a rotating mounting rod, the fixed plate is fixedly mounted in the mounting hole groove, the rotating mounting rod is rotatably mounted on the inner wall of the mounting hole groove, a rotating locking block is rotatably mounted on the rotating mounting rod, one end of the rotating locking block is located at the bottom of the circular connecting plate, and a push-to-start twist is fixed on the outer wall of the other end of the rotating locking block.

[0009] Furthermore, in order to initially limit the rotating locking block through the elastic force of the locking spring, a locking spring is installed on the inner wall of the other end of the rotating locking block, and one end of the locking spring is fixedly connected to the fixing plate.

[0010] Furthermore, in order to enable the limit slider to move up and down on the outer wall of the liquid storage cylinder, a vertical limit groove is opened on the outer wall of the bottom side of the liquid storage cylinder, and a limit slider is slidably arranged in the vertical limit groove.

[0011] Furthermore, in order to drive the protective sleeve to move up and down when the limiting slider slides in the vertical limiting groove, and to enable the protective sleeve to be wrapped around the injection needle, a protective sleeve is fixed on the limiting slider, the length of the protective sleeve is greater than the length of the injection needle, and a protective needle cap is movably inserted on the injection needle.

[0012] The technical effects and advantages of the utility model are as follows: controlling the second piston to advance in the liquid storage cylinder can allow the propelling liquid to enter the sealed cavity through the connecting tube, and can evenly increase the propelling liquid in the sealed cavity, so that the evenly increased propelling liquid can advance the first piston, thereby pushing the injection liquid to enter the human body evenly, providing a buffer for the advancement of the injection liquid, solving the problem of the propulsion force changing with the change of the spring elastic force when the existing injection pen is directly driven by a spring, and effectively improving the comfort and practicality of the injection pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the installation structure of the limit slider of the utility model on the liquid storage cylinder;

[0015] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 4 For this utility model Figure 3 The enlarged structural diagram at A in the middle;

[0017] In the figure: 1. Liquid storage cylinder; 2. Injection needle; 3. Circular dividing baffle; 4. First piston; 5. Injection liquid; 6. Second piston; 7. Propelling liquid; 8. Connecting tube; 9. Circular connecting plate; 10. Mounting sleeve; 11. Propelling spring; 12. Locking start assembly; 1201. Fixed plate; 1202. Rotating mounting rod; 1203. Rotating locking block; 1204. Pressing start button; 1205. Locking spring; 13. Limiting slider; 14. Protective sleeve; 15. Protective needle cap. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-4 As shown, a novel disposable prefilled automatic injection pen comprises a liquid storage cylinder 1, an injection needle 2 is fixed at one end of the liquid storage cylinder 1, a circular partition baffle 3 and a first piston 4 are installed on the inner wall of the liquid storage cylinder 1, the circular partition baffle 3 is fixed in the liquid storage cylinder 1, the first piston 4 is slidably clamped in the liquid storage cylinder 1, an injection liquid 5 is prefilled between the first piston 4 and the injection needle 2, a sealed cavity is formed between the first piston 4 and the circular partition baffle 3, a second piston 6 is also slidably clamped in the liquid storage cylinder 1, a propelling liquid 7 is prefilled between the second piston 6 and the circular partition baffle 3, and the propelling liquid 7 is connected to the sealed cavity through a connecting pipe 8. The sealed cavities are connected. When in use, the second piston 6 is controlled to advance in the liquid storage cylinder 1, so that the propelling liquid 7 enters the sealed cavity through the connecting tube 8. As the propelling liquid 7 in the sealed cavity gradually increases, the propelling liquid 7 pushes the first piston 4 to push the injection liquid 5, thereby realizing the propulsion injection function. During the propulsion injection process, the propelling liquid 7 enters the sealed cavity evenly through the connecting tube 8 to realize propulsion, so that the injection liquid 5 is evenly propulsed, which solves the problem that the existing automatic injection pen is propelled by the propulsion spring 11, and the spring driving force gradually decreases as the spring gradually extends, resulting in uneven injection.

[0020] As a technical optimization solution of the utility model, Figure 3As shown, a circular connecting plate 9 is fixedly installed on the top of the second piston 6, and the circular connecting plate 9 is slidably clamped in the liquid storage cylinder 1. A mounting sleeve 10 is fixed on the top of the liquid storage cylinder 1. The circular connecting plate 9 is connected to the inner wall of the top side of the mounting sleeve 10 through a propulsion spring 11. When in use, the propulsion spring 11 is initially in a compressed state. The second piston 6 passes through the circular connecting plate 9 and, under the action of the propulsion spring 11, slides and propels forward in the liquid storage cylinder 1, so that the injection pen realizes the automatic propulsion function.

[0021] As a technical optimization solution of the utility model, Figure 3 As shown, a mounting hole groove is opened on the side wall of the top side of the liquid storage cylinder 1, and a locking start component 12 is installed in the mounting hole groove. One end of the locking start component 12 is located at the bottom of the circular connecting plate 9. The locking start component 12 is controlled to limit the circular connecting plate 9. When not in use, the injection pen always maintains its initial state. When used for injection, the circular connecting plate 9 can be contacted and limited, and the circular connecting plate 9 and the second piston 6 can be pushed by the thrust spring 11.

[0022] As a technical optimization solution of the utility model, Figure 4 As shown, the locking start assembly 12 includes a fixed plate 1201 and a rotating mounting rod 1202, the fixed plate 1201 is fixedly mounted in the mounting hole groove, the rotating mounting rod 1202 is rotatably mounted on the inner wall of the mounting hole groove, a rotating locking block 1203 is rotatably mounted on the rotating mounting rod 1202, one end of the rotating locking block 1203 is located at the bottom of the circular connecting plate 9, a pressing start button 1204 is fixed on the outer wall of the other end of the rotating locking block 1203, a locking spring 1205 is installed on the inner wall of the other end of the rotating locking block 1203, and the locking spring 1205 is installed on the inner wall of the other end of the rotating locking block 1203. 05 One end is fixedly connected to the fixed plate 1201. When in use, press the push-start button 1204 to rotate the rotating locking block 1203 on the rotating mounting rod 1202, so that one end of the rotating locking block 1203 is separated from the bottom of the circular connecting plate 9, and the circular connecting plate 9 is pushed forward under the action of the propulsion spring 11 to achieve the automatic injection effect. Before injection, the locking spring 1205 presses one end of the rotating locking block 1203 to make the rotating locking block 1203 always located at the bottom of the circular connecting plate 9, and the circular connecting plate 9 is supported and limited.

[0023] As a technical optimization solution of the utility model, Figure 3As shown, a vertical limit groove is opened on the outer wall of the bottom side of the liquid storage cylinder 1, and a limit slider 13 is slidably provided in the vertical limit groove. A protective sleeve 14 is fixed on the limit slider 13. The length of the protective sleeve 14 is greater than the length of the injection needle 2, and a protective needle cap 15 is movably inserted on the injection needle 2. After the injection is completed, the protective sleeve 14 is controlled to slide on the protective sleeve 14 through the limit slider 13, so that the protective sleeve 14 is wrapped around the injection needle 2, so as to prevent the injection needle 2 from causing harm to people when the injection pen is handled after the injection is completed, thereby improving the safety of the injection pen handling.

[0024] When the utility model is in use, first remove the protective needle cap 15, hold the liquid storage cylinder 1, insert the injection needle 2 into the skin, and press the push-start button 1204 to make one end of the rotating locking block 1203 disengage from the bottom of the circular connecting plate 9, so that the circular connecting plate 9 is pushed forward under the action of the propulsion spring 11, and the propulsion liquid 7 is pushed into the sealed cavity through the connecting tube 8. As the propulsion liquid 7 in the sealed cavity gradually increases, the propulsion liquid 7 pushes the first piston 4, and the first piston 4 pushes the injection liquid 5 into the human body to realize the injection function. After the injection is completed, the protective sleeve 14 is controlled to slide on the protective sleeve 14 through the limiting slider 13, so that the protective sleeve 14 is wrapped around the injection needle 2 to prevent the protective needle cap 15 from being lost, so that the injection needle 2 causes human body damage during handling.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A novel disposable prefilled automatic injection pen, comprising a liquid storage cartridge (1), characterized in that: An injection needle (2) is fixed at one end of the liquid storage cylinder (1), and a circular partition baffle (3) and a first piston (4) are installed on the inner wall of the liquid storage cylinder (1). The circular partition baffle (3) is fixed in the liquid storage cylinder (1), and the first piston (4) is slidably clamped in the liquid storage cylinder (1). An injection liquid (5) is pre-filled between the first piston (4) and the injection needle (2), and a sealed cavity is formed between the first piston (4) and the circular partition baffle (3). A second piston (6) is also slidably clamped in the liquid storage cylinder (1), and a propelling liquid (7) is pre-filled between the second piston (6) and the circular partition baffle (3), and the propelling liquid (7) is connected to the sealed cavity through a connecting pipe (8).

2. A novel disposable prefilled automatic injection pen according to claim 1, characterized in that: A circular connecting plate (9) is fixedly mounted on the top of the second piston (6), and the circular connecting plate (9) is slidably mounted in the liquid storage cylinder (1). A mounting sleeve (10) is fixed on the top of the liquid storage cylinder (1), and the circular connecting plate (9) is connected to the inner wall of the top side of the mounting sleeve (10) via a propulsion spring (11).

3. A novel disposable prefilled automatic injection pen according to claim 2, characterized in that: A mounting hole groove is provided on the top side wall of the liquid storage cylinder (1), a locking and starting assembly (12) is installed in the mounting hole groove, and one end of the locking and starting assembly (12) is located at the bottom of the circular connecting plate (9).

4. A novel disposable prefilled automatic injection pen according to claim 3, characterized in that: The locking and starting assembly (12) comprises a fixed plate (1201) and a rotatable mounting rod (1202), wherein the fixed plate (1201) is fixedly mounted in the mounting hole groove, and the rotatable mounting rod (1202) is rotatably mounted on the inner wall of the mounting hole groove.

5. A novel disposable prefilled automatic injection pen according to claim 4, characterized in that: A rotating locking block (1203) is rotatably mounted on the rotating mounting rod (1202), one end of the rotating locking block (1203) is located at the bottom of the circular connecting plate (9), and a push-start button (1204) is fixed on the outer wall of the other end of the rotating locking block (1203).

6. A novel disposable prefilled automatic injection pen according to claim 5, characterized in that: A locking spring (1205) is installed on the inner wall of the other end of the rotating locking block (1203), and one end of the locking spring (1205) is fixedly connected to the fixing plate (1201).

7. A novel disposable prefilled automatic injection pen according to claim 1, characterized in that: A vertical limit groove is provided on the outer wall of the bottom side of the liquid storage cylinder (1), and a limit slider (13) is slidably mounted in the vertical limit groove.

8. A novel disposable prefilled automatic injection pen according to claim 7, characterized in that: A protective sleeve (14) is fixed on the limiting slide block (13); the length of the protective sleeve (14) is greater than the length of the injection needle (2); and a protective needle cap (15) is movably inserted on the injection needle (2).

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