Connecting structure of injection pen

Abstract

The utility model relates to the field of injection pens, in particular to a connecting structure of an injection pen. Comprising a pen shell which is hollow, and openings are formed in the two ends of the pen shell; an injection pushing part and a main control panel are installed in the pen shell, one opening end of the pen shell is connected with a control part, and the other opening end of the pen shell is connected with a clamping type bottle; a flexible circuit board is arranged in the pen shell, the two ends of the flexible circuit board are electrically connected with the main control panel and the control part respectively, and the middle of the flexible circuit board is connected with the injection pushing part in a penetrating mode. In the invention, two ends of the flexible circuit board are inserted into the control part and the main control panel, and the middle part of the flexible circuit board penetrates through the driving motor and is welded and fixed with the driving motor. Therefore, when the flexible circuit board is vibrated, the shaking degree of the two ends of the flexible circuit board can be reduced, so that the plugging parts of the two ends of the flexible circuit board are not easy to fall off.

Description

Technical Field

[0001] The utility model relates to the field of injection pens, in particular to a connection structure of an injection pen. Background Art

[0002] An electronic injection pen is a smart device that uses a precision stepper motor and electronic control principles to complete the drug injection process. Compared to mechanical injection pens, electronic injection pens offer higher precision, a variety of functional modules, and are generally reusable.

[0003] In order to meet assembly requirements, the injection pen in the prior art has internal devices connected at both ends via wires in the form of a connector. When subjected to vibration such as being dropped, the connection ends are easily detached. Utility Model Content

[0004] The utility model aims to provide a connection structure of an injection pen to solve the problem in the prior art that the connection ends of wires between internal devices of the injection pen are easily detached.

[0005] The technical solution of the utility model is: a connection structure of an injection pen, comprising a pen housing, the interior of the pen housing being hollow and provided with openings at both ends; an injection pusher and a main control panel being installed inside the pen housing, one open end of the pen housing being connected to a control unit, and the other open end of the pen housing being connected to a cartridge;

[0006] A flexible circuit board is provided inside the pen housing. Two ends of the flexible circuit board are electrically connected to the main control panel and the control part respectively, and the middle part is connected through the injection push part.

[0007] Preferably, the injection push part includes a push rod mechanism and a drive motor, and the push rod mechanism abuts against the cartridge bottle when driven by the drive motor; the flexible circuit board passes through the drive motor and is welded and fixed to the drive motor.

[0008] Preferably, the control unit includes a control knob and a knob circuit board, and the flexible circuit board is plugged into the knob circuit board.

[0009] Preferably, the push rod mechanism includes a push rod with threaded engagement and a push rod sleeve fixed to the pen housing, and the push rod is driven by a driving motor to abut against the cartridge bottle;

[0010] A push rod square sleeve is further sleeved outside the push rod sleeve, and the main control panel is fixed on the push rod square sleeve through fasteners.

[0011] Preferably, the end of the flexible circuit board close to the control part is set to a U-shaped structure, which is bent to form a first part and a second part parallel to each other; the first part is provided with a through hole, the driving motor passes through the through hole and is connected to the first part; the second part is plugged into the knob circuit board.

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] (1) In this application, the ends of the flexible circuit board are connected to the control unit and the main control panel, while the middle part is connected to the drive motor and welded to it. This can reduce the shaking of the ends of the flexible circuit board when it is subjected to vibration, making it difficult for the ends of the flexible circuit board to fall off.

[0014] (2) A through hole is provided on the flexible circuit board so that the driving motor can pass through it. The through hole can be used in conjunction with welding to further enhance the firmness of the connection between the flexible circuit board and the servo motor and make the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a cross-sectional view of the connection structure of an injection pen according to the present invention;

[0017] Figure 2 This is a structural diagram of the push rod mechanism of the utility model;

[0018] Figure 3 This is a diagram of the internal structure of the connection structure of an injection pen according to the present invention;

[0019] Figure 4 This is a diagram of the internal structure of the connection structure of an injection pen according to the present invention;

[0020] Figure 5 This is a structural diagram of the flexible circuit board described in the utility model;

[0021] Among them: 1. Pen case, 2. Cartridge bottle, 21. Rubber stopper, 3. Injection push part, 31. Push rod mechanism, 311. Push rod, 312. Push rod sleeve, 313. Drive motor, 32. Push rod square sleeve, 4. Main control panel, 5. Control part, 51. Control knob, 52. Knob circuit board, 6. Flexible circuit board, 61. Through hole, 62. First part, 63. Second part. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0023] like Figure 1 and Figure 2The figure shows a connection structure for an injection pen, comprising a pen housing 11. A medicine loading unit is provided at the front end of the pen housing 11, which is used to engage a cartridge 2. The cartridge 2 has a needle attached to one end and an open end with a rubber plug 21 fitted to the opening. The plug 21 can be pushed to eject the liquid medicine from the cartridge through the needle. An injection pusher 3 is provided within the middle end of the pen housing 1. This pusher 3 comprises a push rod mechanism 31, comprising a push rod 311 coaxially arranged with the pen housing 1, a push rod sleeve 312 mated to the push rod 311, and a drive motor 313. One end of the push rod 311 is fixed to the actuator end of the drive motor 313, and its outer wall is provided with external threads. The inner wall of the push rod sleeve 312 is provided with internal threads that threadably engage with the push rod 311. The end of the push rod 311, distal from the drive motor 313, abuts against the rubber plug 21 within the cartridge 2. The driving motor 313 drives the push rod sleeve 312 to rotate, so that the push rod 311 performs telescopic movement in cooperation with the push rod sleeve 312 , thereby pushing the plug 21 in the cartridge 2 toward the needle and pushing out the liquid medicine in the cartridge 2 .

[0024] Combine Figure 1-Figure 4 As shown, the push rod sleeve 312 is encased in a push rod square sleeve 32. The push rod square sleeve 32 has a rectangular cross-section perpendicular to its length and carries a main control panel 4. A control unit 5 is located at the rear end of the pen housing 1. This unit comprises an external control knob 51 and an internal knob circuit board 52. The rotation angle of the control knob 51 is transmitted to the main control panel 4 via the knob circuit board 52, thereby controlling the drive motor 313 to operate at the corresponding stroke.

[0025] A flexible circuit board 6 is provided in the pen housing 1 for connecting the main control panel 4, the drive motor 313 and the knob circuit board 52. Specifically, the two ends of the flexible circuit board 6 are plugged into the main control panel 4 and the knob circuit board 52, and the middle part passes through the drive motor 313 and is welded to the drive motor 313.

[0026] like Figure 5 As shown, the flexible circuit board 6 is bent into a U-shaped structure at one end near the control unit 5, comprising a first portion 62 and a second portion 63 that are parallel to each other. The first portion 62 defines a through hole 61, through which the drive motor 313 passes and is welded to the first portion 62. The second portion 63 is plugged and secured to the knob circuit board 52.

[0027] With this arrangement, when the present application is subjected to vibration, the welding point and the penetration point between the middle part of the flexible circuit board 6 and the driving motor 313 can reduce the shaking degree at both ends, thereby making the plug-in points at both ends of the flexible circuit board 6 not easy to fall off.

[0028] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they are not intended to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A connection structure of an injection pen, characterized in that: The pen case (1) comprises a pen case (1) which is hollow inside and has openings at both ends; an injection pusher (3) and a main control panel (4) are installed inside the pen case (1); one open end of the pen case (1) is connected to a control unit (5), and the other open end is connected to a cartridge bottle (2); A flexible circuit board (6) is provided inside the pen housing (1); two ends of the flexible circuit board (6) are electrically connected to the main control panel (4) and the control unit (5) respectively, and the middle portion is connected through the injection push unit (3).

2. The connection structure of an injection pen according to claim 1, characterized in that: The injection pushing portion (3) comprises a push rod mechanism (31) and a drive motor (313). The push rod mechanism (31) is driven by the drive motor (313) to abut against the cartridge bottle (2). The flexible circuit board (6) passes through the drive motor (313) and is welded and fixed to the drive motor (313).

3. The connection structure of an injection pen according to claim 2, characterized in that: The control part (5) comprises a control knob (51) and a knob circuit board (52), and the flexible circuit board (6) is plugged into the knob circuit board (52).

4. The connection structure of an injection pen according to claim 3, characterized in that: The push rod mechanism (31) comprises a push rod (311) threadedly engaged and a push rod sleeve (312) fixed to the pen housing (1); the push rod (311) is driven by a driving motor (313) to abut against the cartridge bottle (2); The push rod sleeve (312) is further provided with a push rod square sleeve (32), and the main control panel (4) is fixed to the push rod square sleeve (32) via fasteners.

5. The connection structure of an injection pen according to claim 4, characterized in that: One end of the flexible circuit board (6) close to the control unit (5) is configured as a U-shaped structure, and is bent to form a first portion (62) and a second portion (63) that are parallel to each other; the first portion (62) is provided with a through hole (61), and the driving motor (313) passes through the through hole (61) and is connected to the first portion (62); the second portion (63) is plugged into the knob circuit board (52).

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