Pressing type automatic injection pen

Abstract

The utility model relates to the technical field of medical instruments, and discloses a pressing type automatic injection pen which comprises a shell, a button and a plunger arranged in the shell, the shell is provided with an opening, a clamping jaw is arranged on the inner wall of the shell and located at the end, provided with the opening, of the shell, a clamping groove is formed in the peripheral wall of the end, facing the opening, of the plunger, and the clamping jaw is detachably clamped in the clamping groove. The button is arranged at the opening and can move in the axial direction of the plunger, and the button is used for pressing the clamping jaw so that the clamping jaw can be separated from the plunger. Specifically, a clamping groove is formed in the peripheral wall of the plunger, a clamping jaw is arranged on the inner wall of the shell, and the clamping jaw is detachably connected with the clamping groove, so that the plunger can be stably clamped in the shell in an initial state, and normal operation of the pressing type automatic injection pen can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a push-type automatic injection pen. Background Art

[0002] The automatic injection pen is usually activated by pressing. In the related art, the press-type automatic injection pen includes a housing, a button, a plunger, an elastic member and an injection mechanism. The housing has an opening, and the button, the plunger, the elastic member and the injection mechanism are all arranged in the housing, and the button is arranged at the opening. The plunger is clamped in the housing, and the elastic member is used to drive the plunger to move. During the injection process, the user puts the injection end of the automatic injection pen on the skin surface and then presses the button. This action will cause the plunger to be out of the clamped state, and the elastic member will drive the plunger to move to trigger the injection mechanism, and the injection mechanism will push the drug into the body at a set dose. In the automatic injection pen with this structure, the plunger must be stably clamped in the housing in the initial state to ensure the normal operation of the automatic injection pen. Utility Model Content

[0003] The utility model aims to provide a push-type automatic injection pen, the plunger of which can be stably clamped in a shell.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a push-type automatic injection pen, including a shell, a button and a plunger arranged in the shell, the shell having an opening, the inner wall of the shell being provided with a claw, the claw being located at the end of the shell having the opening, the outer peripheral wall of the plunger facing the opening end being provided with a groove, the claw being detachably engaged in the groove, the button being provided at the opening and movable axially along the plunger, the button being used to press the claw to separate the claw from the plunger.

[0005] In a specific embodiment of the utility model, the claw includes a first claw body, a second claw body and a third claw body, the first claw body is connected to the shell, the second claw body is plate-shaped, the second claw body is oblique to the axis of the plunger, one end of the second claw body is connected to the first claw body, and the other end extends away from the opening toward the center side of the plunger, the third claw body is connected to the end of the second claw body away from the first claw body, and the third claw body is located on the side of the second claw body facing the center side of the shell, the third claw body can detachably contact the side of the slot close to the opening, and the button is used to press the second claw body.

[0006] In a specific embodiment of the utility model, the clamping groove is annular and is arranged around the axis of the plunger, and at least two clamping claws are arranged around the axis of the plunger, and two adjacent clamping claws are arranged at intervals.

[0007] In a specific embodiment of the present invention, the third claw body has a guide surface at one end away from the first claw body, the guide surface is obliquely intersected with the plunger, and the guide surface faces away from the opening.

[0008] In a specific embodiment of the present invention, the plunger is provided with a chamfer at one end facing the opening.

[0009] In a specific embodiment of the utility model, the button includes a connecting body and a pressing body, the connecting body has a mounting groove, the pressing body is arranged on the bottom surface of the mounting groove, the shell has an end with the opening inserted into the mounting groove, the pressing body is inserted into the shell through the opening, the connecting body is connected to the shell and can move along the axial direction of the plunger, and the pressing body is used to press the claw.

[0010] In a specific embodiment of the utility model, a side of the pressing body facing the plunger is provided with an avoidance groove, and the plunger can extend into the avoidance groove.

[0011] In a specific embodiment of the utility model, the button further includes a first reinforcing rib, wherein the first reinforcing rib is arranged on a groove side surface of the avoidance groove and connected to a groove bottom surface of the avoidance groove.

[0012] In a specific embodiment of the utility model, the button also includes a second reinforcing rib, which is arranged on the bottom surface of the mounting groove, and one end of the second reinforcing rib is connected to the groove side of the mounting groove, and the other end is connected to the side wall of the pressing body.

[0013] In a specific embodiment of the utility model, the outer peripheral wall of the housing having the open end is provided with a connecting groove, and the connecting groove is annular and arranged around the axis of the plunger;

[0014] The groove side wall of the installation groove has a connecting protrusion, the connecting protrusion is annular, and the connecting protrusion is inserted into the connecting groove;

[0015] Wherein, in the axial direction of the plunger, the length of the connecting groove is greater than the length of the connecting protrusion.

[0016] The embodiment of the utility model is a push-type automatic injection pen, which has the following beneficial effects compared with the prior art:

[0017] In the push-type automatic injection pen of the embodiment of the utility model, the outer peripheral wall of the plunger is provided with a card slot, and the inner wall of the shell is provided with a claw, and the claw and the card slot are detachably connected. Therefore, the plunger can be stably clamped in the shell in the initial state, which can ensure the normal operation of the push-type automatic injection pen; and during the injection process, the user presses the button, and the button presses the claw to disengage the plunger from the clamped state, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a push-type automatic injection pen according to an embodiment of the utility model;

[0019] Figure 2 It is a cross-sectional structural diagram of a push-type automatic injection pen according to an embodiment of the utility model;

[0020] Figure 3 This utility model embodiment Figure 2 A is an enlarged schematic diagram;

[0021] Figure 4 It is a structural diagram of a button of an embodiment of the utility model;

[0022] Figure 5 It is a structural diagram of the connection between the housing and the claws of the embodiment of the utility model.

[0023] In the figure, 1, shell; 101, opening; 102, connecting groove; 2, button; 21, connecting body; 211, mounting groove; 22, pressing body; 221, avoidance groove; 23, first reinforcing rib; 24, second reinforcing rib; 25, connecting protrusion; 3, plunger; 301, slot; 302, chamfer; 4, claw; 41, first claw body; 42, second claw body; 43, third claw body; 431, guide surface. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] like Figure 1-5 As shown, a push-type automatic injection pen according to an embodiment of the utility model comprises a shell 1, a button 2 and a plunger 3 arranged in the shell 1, the shell 1 has an opening 101, the inner wall of the shell 1 is provided with a claw 4, the claw 4 is located at the end of the shell 1 having the opening 101, the outer peripheral wall of the plunger 3 facing the end of the opening 101 is provided with a groove 301, the claw 4 can be detachably engaged in the groove 301, the button 2 is arranged at the opening 101 and can move axially along the plunger 3, the button 2 is used to press the claw 4 to separate the claw 4 from the plunger 3.

[0026] Specifically, a card slot 301 is provided on the outer wall of the plunger 3, and a claw 4 is provided on the inner wall of the shell 1. The claw 4 and the card slot 301 can be detachably connected. Therefore, the plunger 3 can be stably clamped in the shell 1 in the initial state, which can ensure the normal operation of the push-type automatic injection pen; and during the injection process, the user presses the button 2, and the button 2 presses the claw 4 to disengage the plunger 3 from the clamped state, which is convenient to operate.

[0027] In the utility model, the push-type automatic injection pen also includes a spring and a syringe. The housing 1 also has an opening opposite to the opening 101. The spring and the syringe are arranged in the housing 1. The plunger 3 is located between the syringe and the opening 101. The opening is for the needle of the syringe to extend. The spring is used to drive the plunger 3 to move along its axial direction so that the plunger 3 pushes the piston in the syringe to move to complete the injection work; wherein, in the initial state, the plunger 3 is engaged with the claw 4, and the spring is in a compressed state, and when the plunger 3 is separated from the claw 4, the spring returns to an extended state and pushes the plunger 3 to move.

[0028] In this embodiment, the claw 4 includes a first claw body 41, a second claw body 42 and a third claw body 43. The first claw body 41 is connected to the housing 1, the second claw body 42 is plate-shaped, the second claw body 42 is oblique to the axis of the plunger 3, one end of the second claw body 42 is connected to the first claw body 41, and the other end extends away from the opening 101 toward the center side of the plunger 3, the third claw body 43 is connected to the end of the second claw body 42 away from the first claw body 41, and the third claw body 43 is located on the side of the second claw body 42 facing the center side of the housing 1, the third claw body 43 can be detachably contacted with the side of the slot 301 close to the opening 101, and the button 2 is used to press the second claw body 42. Specifically, since the second claw body 42 extends toward the center side of the plunger 3, when the button 2 presses the second claw body 42, the second claw body 42 will deviate toward the inner wall of the shell 1, and the third claw body 43 will move with the second claw body 42, thereby, the third claw body 43 will disengage from the slot 301. The claw 4 of this structure has a simple structure and is more reliable in connecting with the plunger 3.

[0029] Further, the slot 301 is annular and is arranged around the axis of the plunger 3. Four claws 4 are arranged around the axis of the plunger 3. Two adjacent claws 4 are arranged at intervals. The third claw body 43 of each claw 4 is clamped in the slot 301. Specifically, the plunger 3 is clamped by four claws 4, which is more reliable. In other embodiments, the claws 4 can be provided with three, five or more claws, which is not limited by the present invention.

[0030] In actual application, when the push-type automatic injection pen is assembled, the plunger 3 is inserted into the housing 1 from the opening to the opening direction and is engaged with the claw 4. Based on this, in order to make the assembly of the plunger 3 smoother, in this embodiment, the end of the third claw body 43 away from the first claw body 41 has a guide surface 431, the guide surface 431 is oblique to the plunger 3, and the guide surface 431 is facing away from the opening 101. With this structure of the claw 4, the plunger 3 first contacts the guide surface 431 during assembly and applies force to the claw 4. As a result, the plunger 3 will cause the second claw 4 to deviate toward the inner wall of the housing 1, and the third claw body 43 will move with the second claw body 42. Based on this, the end of the plunger 3 facing the opening 101 can smoothly pass through the space between the third claw bodies 43, and when the slot 301 corresponds to the third claw body 43, the plunger 3 no longer applies force to the third claw body 43. At this time, the third claw body 43 is reset and engaged in the slot 301.

[0031] Furthermore, a chamfer 302 is provided at one end of the plunger 3 facing the opening 101. Specifically, the edge of the end of the plunger 3 forms the chamfer 302. The chamfer 302 serves as a guide, which can make the assembly of the plunger 3 smoother.

[0032] In this embodiment, the button 2 includes a connecting body 21 and a pressing body 22. The connecting body 21 has a mounting groove 211. The pressing body 22 is arranged on the bottom surface of the mounting groove 211. One end of the shell 1 with an opening 101 is inserted into the mounting groove 211. The pressing body 22 is inserted into the shell 1 through the opening 101. The connecting body 21 is connected to the shell 1 and can move axially along the plunger 3. The pressing body 22 is used to press the second claw body 42 of the claw 4. For the button 2 of this structure, the bottom surface of the mounting groove 211 can limit the axial movement stroke of the connecting body 21 along the plunger 3. The depth of the mounting groove 211 can be reasonably designed to prevent the pressing body 22 from excessively squeezing the second claw body 42.

[0033] Furthermore, a side of the pressing body 22 facing the plunger 3 is provided with an avoidance groove 221, and the plunger 3 can extend into the avoidance groove 221. Based on this, the pressing body 22 can press the four second claw bodies 42 at the same time, which can ensure that the plunger 3 can be smoothly separated from the claw 4. The pressing body 22 of this structure is not easy to deform when pressing the second claw body 42, and the structure is stable and reliable.

[0034] Furthermore, the pressing body 22 is a cylinder, and the button 2 also includes a first reinforcing rib 23, which is arranged on the side surface of the avoidance groove 221 and connected to the bottom surface of the avoidance groove 221. Thus, the structural strength of the pressing body 22 can be enhanced. Based on this, the wall thickness of the pressing body 22 can be reasonably designed to save material and make the pressing body 22 less likely to deform when pressing the second claw body 42.

[0035] Furthermore, the connecting body 21 is also a cylinder, and the button 2 also includes a second reinforcing rib 24, which is arranged on the bottom surface of the mounting groove 211, and one end of the second reinforcing rib 24 is connected to the groove side of the mounting groove 211, and the other end is connected to the side wall of the pressing body 22, thereby strengthening the strength of the connecting body 21. Based on this, the wall thickness of the connecting body 21 can be reasonably designed to save materials, and at the same time, the connecting body 21 is not easy to deform when the pressing body 22 presses the second claw body 42; in addition, the setting of the first reinforcing rib 23 and the second reinforcing rib 24 can make the button 2 use less material as a whole and have higher strength, and the structural reliability of the button 2 is high.

[0036] In this embodiment, the outer peripheral wall of the shell 1 at one end of the opening 101 is provided with a connecting groove 102, which is annular and arranged around the axis of the plunger 3; the groove side wall of the mounting groove 211 has a connecting protrusion 25, which is annular and inserted into the connecting groove 102. Based on this, the button 2 can be stably connected to the shell 1. In addition, in the axial direction of the plunger 3, the length of the connecting groove 102 is greater than the length of the connecting protrusion 25, thereby ensuring that the button 2 can move along the axial direction of the plunger 3; this connection structure between the button 2 and the shell 1 is simple in structure, easy to process, and easy to assemble.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A push-type automatic injection pen, characterized in that: The invention comprises a shell (1), a button (2) and a plunger (3) arranged in the shell (1); the shell (1) has an opening (101); the inner wall of the shell (1) is provided with a claw (4); the claw (4) is located at one end of the shell (1) having the opening (101); the outer peripheral wall of the plunger (3) facing the end of the opening (101) is provided with a groove (301); the claw (4) is detachably engaged in the groove (301); the button (2) is arranged at the opening (101) and can move axially along the plunger (3); the button (2) is used to press the claw (4) to separate the claw (4) from the plunger (3).

2. The push-type automatic injection pen according to claim 1, characterized in that: The clamping claw (4) comprises a first claw body (41), a second claw body (42) and a third claw body (43); the first claw body (41) is connected to the housing (1); the second claw body (42) is plate-shaped; the second claw body (42) is obliquely intersected with the axis of the plunger (3); one end of the second claw body (42) is connected to the first claw body (41); the other end of the second claw body (42) is away from the opening (101) and extends toward the center side of the plunger (3); the third claw body (43) is connected to the end of the second claw body (42) away from the first claw body (41); and the third claw body (43) is located on a side of the second claw body (42) facing the center side of the housing (1); the third claw body (43) is detachably in contact with the side of the slot (301) close to the opening (101); and the button (2) is used to press the second claw body (42).

3. The push-type automatic injection pen according to claim 2, characterized in that: The clamping groove (301) is annular and is arranged around the axis of the plunger (3). At least two clamping claws (4) are arranged around the axis of the plunger (3), and two adjacent clamping claws (4) are arranged at intervals.

4. The push-type automatic injection pen according to claim 2, characterized in that: The third claw body (43) has a guide surface (431) at one end away from the first claw body (41), the guide surface (431) is obliquely intersected with the plunger (3), and the guide surface (431) faces away from the opening (101).

5. The push-type automatic injection pen according to claim 4, characterized in that: The plunger (3) is provided with a chamfer (302) at one end facing the opening (101).

6. The push-type automatic injection pen according to claim 1, characterized in that: The button (2) comprises a connecting body (21) and a pressing body (22); the connecting body (21) has a mounting groove (211); the pressing body (22) is arranged on the bottom surface of the mounting groove (211); the housing (1) is provided with an end of the opening (101) inserted into the mounting groove (211); the pressing body (22) passes through the opening (101) and is inserted into the housing (1); the connecting body (21) is connected to the housing (1) and can move axially along the plunger (3); and the pressing body (22) is used to press the claw (4).

7. The push-type automatic injection pen according to claim 6, characterized in that: The side of the pressing body (22) facing the plunger (3) is provided with an escape groove (221), and the plunger (3) can extend into the escape groove (221).

8. The push-type automatic injection pen according to claim 7, characterized in that: The button (2) further comprises a first reinforcing rib (23), wherein the first reinforcing rib (23) is arranged on a groove side surface of the avoidance groove (221) and is connected to a groove bottom surface of the avoidance groove (221).

9. The push-type automatic injection pen according to claim 6, characterized in that: The button (2) further comprises a second reinforcing rib (24), wherein the second reinforcing rib (24) is arranged on the bottom surface of the mounting groove (211), and one end of the second reinforcing rib (24) is connected to the groove side surface of the mounting groove (211), and the other end of the second reinforcing rib (24) is connected to the side wall of the pressing body (22).

10. The push-type automatic injection pen according to claim 6, characterized in that: The outer peripheral wall of the housing (1) at one end of the open port (101) is provided with a connecting groove (102), the connecting groove (102) is annular and arranged around the axis of the plunger (3); The groove side wall of the installation groove (211) has a connecting protrusion (25), the connecting protrusion (25) is annular, and the connecting protrusion (25) is inserted into the connecting groove (102); Wherein, in the axial direction of the plunger (3), the length of the connecting groove (102) is greater than the length of the connecting protrusion (25).

Images