Electronic injection pen

Abstract

The present invention relates to the field of injection pens, and in particular to an electronic injection pen and a control method thereof. The electronic injection pen comprises an injection pen body and a control module; the injection pen body is hollow inside, and the front and rear ends are set as openings; the front end of the injection pen body is detachably connected to a medicine loading part, and the medicine loading part is used to load a cartridge bottle; a pushing part is arranged inside the injection pen body, and the pushing part comprises a push rod, and the push rod can abut against the rubber plug in the cartridge bottle under the drive of a driving motor; the control module comprises a pressure sensor arranged in the injection pen body, and a control knob arranged at one end of the injection pen body away from the medicine loading part; the pressure sensor is coupled with the driving motor to detect the force of the driving motor on the push rod; the control knob has two input signals of rotation and pressing, which are respectively used for switching and confirming the injection pen program.

Description

Technical Field

[0001] The present invention relates to the field of injection pens, and in particular to an electronic injection pen. Background Art

[0002] An electronic injection pen is a smart injection pen that uses a precise stepper motor drive and electronic control principle to complete the drug injection process. Electronic injection pens are more accurate than mechanical injection pens, have more diverse functional modules, and are generally reusable products.

[0003] Existing electronic injection pens generally use motors to achieve automatic drug injection. Compared with mechanical syringes, this type of syringe has high injection accuracy and is convenient for health management. The disadvantage is that there are many buttons, the learning cost is high, and the original usage habits of mechanical syringes cannot be continued. Especially for specific groups of people, the user experience is not user-friendly, which is not conducive to the promotion of electronic injection pens. Summary of the invention

[0004] The purpose of the present invention is to provide an electronic injection pen to solve the technical problems of the prior art that there are many buttons and the learning cost is high.

[0005] The technical solution of the present invention is: an electronic injection pen, comprising an injection pen body and a control module;

[0006] The injection pen body is hollow inside, and the front and rear ends are set as openings; the front end of the injection pen body is detachably connected to a medicine loading part, and the medicine loading part is used to load a cartridge bottle; the injection pen body is provided with a pushing part inside, and the pushing part includes a push rod, and the push rod can abut against the rubber plug in the cartridge bottle under the drive of the driving motor;

[0007] The control module includes a pressure sensor arranged in the injection pen body, and a control knob arranged at one end of the injection pen body away from the charging part; the pressure sensor is coupled to the drive motor to detect the force exerted by the drive motor on the push rod; the control knob has two input signals, rotation and pressing, which are respectively used for switching and confirming the injection pen program.

[0008] Preferably, the following parameters are set:

[0009] The actual detection value F of the pressure sensor, and the first preset value F1 and the second preset value F2, wherein F1<F2;

[0010] The push rod running stroke D and the third preset value D1.

[0011] Preferably, the injection pen program includes a first action mode, and the injection pen can perform the following operations in the first action mode:

[0012] When the push rod moves to a stroke D<D1 driven by the driving motor and the detection value F2≥F>F1 of the pressure sensor, the push rod stops running; and each time the control knob is short pressed, the driving motor can drive the push rod to push the rubber plug to run a single stroke of 1-3mm.

[0013] Preferably, the injection pen program includes a second action mode, until the driving motor drives the push rod to run the stroke D>D1, the detection value F of the pressure sensor is always less than F2; the injection pen program enters the second action mode and can perform the following operations:

[0014] The driving motor drives the push rod to run in the reverse direction until it is reset.

[0015] Preferably, when the push rod is driven by the drive motor to run a stroke D < D1 and the pressure sensor detects a value F > F2, the drive motor stops working and sounds an alarm.

[0016] Preferably, an automatic operation module is further provided, and the automatic operation module comprises a first detection contact and a second detection contact respectively fixed in the medicine loading part and the injection pen body;

[0017] The first detection contact and the second detection contact are coupled when the medicine filling portion is clamped to the injection pen body, and the injection pen can execute the corresponding first action mode or second action mode.

[0018] Preferably, the first detection contact and the second detection contact are respectively a magnet and a Hall sensor.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) The present invention adjusts the injection pen program to execute the first action mode or the second action mode in different situations by setting a control knob, cooperating with a pressure sensor and detecting the stroke of the push rod; it is used to set the initial position of the push rod after the medicine bottle is reused, and to detect the presence or absence of the cartridge bottle and whether it is empty. Through the automatic judgment of the program, the operation process is simplified and the learning cost of the injection pen is reduced.

[0021] (2) An automatic operation module is also provided, so that after the medicine loading part is connected to the injection pen body, the injection pen program can automatically execute the corresponding first action mode or second action mode, thereby improving the automation level of the injection pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 A cross-sectional view of an electronic injection pen according to the present invention;

[0024] Figure 2 This is a flowchart of the injection pen program of the electronic injection pen described in the present invention;

[0025] Figure 3 For the present invention Figure 1 Enlarged view of point A in the middle;

[0026] Wherein: 1. injection pen body, 2. medicine filling part, 21. cartridge bottle, 22. rubber stopper, 3. pushing part, 31. push rod, 32. push rod sleeve, 33. driving motor, 4. control knob, 5. automatic operation module, 51. first detection contact, 52. second detection contact, 6. function key. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with specific embodiments:

[0028] like Figure 1 As shown, an electronic injection pen comprises an injection pen body 1 and a control module.

[0029] The head end of the injection pen body 1 is detachably provided with a medicine loading part 2, the interior of which is used to clamp a cartridge bottle 21, one end of the bottle body of the cartridge bottle 21 is connected to the needle, and the other end is open, and a rubber plug 22 is matched at the opening, and the liquid medicine in the bottle body can be pushed out from the needle by pushing the rubber plug 22. The middle end of the injection pen body 1 is provided with a pushing part 3, and the pushing part 3 includes a push rod mechanism, which has a push rod 31 coaxially arranged with the injection pen body 1, a push rod sleeve 32 matched with the push rod 31, and a driving motor 33. One end of the push rod 31 is fixed to the execution end of the driving motor 33, and the outer wall is provided with an external thread. The inner wall of the push rod sleeve 32 is provided with an internal thread and matched with the thread of the push rod 31, and the end of the push rod 31 away from the driving motor 33 abuts against the rubber plug 22 in the cartridge bottle 21. The driving motor 33 drives the push rod sleeve 32 to rotate, so that the push rod 31 threadably matched with the push rod sleeve 32 performs telescopic movement, thereby pushing the rubber plug 22 in the cartridge bottle 21 to move toward the needle head, and pushing out the liquid medicine in the cartridge bottle 21.

[0030] The control module includes a pressure sensor disposed in the injection pen body 1, and a control knob 4 disposed at one end of the injection pen body 1 away from the medicine loading part 2. The pressure sensor is coupled to the drive motor 33 to detect the force exerted by the drive motor 33 on the push rod 31; the control knob 4 has two input signals, rotation and pressing, which are used for switching and confirming the injection pen program respectively.

[0031] The following parameters are set: the actual detection value F of the pressure sensor, the first preset value F1 and the second preset value F2, and F1<F2. The running stroke D of the push rod 31 and the third preset value D1.

[0032] Among them, the first preset value is set to the thrust of the driving motor 33 on the push rod 31 when the push rod 31 is unloaded; the second preset value F2 is set to the maximum static friction between the plug 22 in the cartridge bottle 21 and the bottle body of the cartridge bottle 21; the third preset value D1 is set to the stroke that the push rod 31 and the plug 22 need to run when the plug 22 is located at the front end of the cartridge bottle 21.

[0033] In actual use, the liquid medicine in the cartridge 21 is often not used up at one time. Therefore, when the same cartridge 21 is used subsequently, the rubber plug 22 in the cartridge 21 will not be at the initial position at the bottom of the bottle, but near the front or middle of the cartridge 21.

[0034] For this reason, Figure 2 As shown, in this embodiment, the injection pen program includes a first action mode, which is set as an exhaust mode for abutting the push rod 31 against the stopper 22 in the cartridge bottle 21 before injection, and setting the current position as the initial position, so as to facilitate control of the amount of medicine injected.

[0035] Specifically, the injection pen can enter the first action mode by rotating the control knob 4 and perform the following actions:

[0036] The push rod 31 is driven by the drive motor 33 to move toward the medicine charging part 2. At this time, the push rod 31 is unloaded, and the driving force F of the drive motor 33 on the push rod 31 detected by the pressure sensor is F1. The drive motor 33 continues to drive the push rod 31 to operate. If the push rod 31 abuts against the rubber plug 22 in the cartridge bottle 21, the push rod 31 is loaded, and the thrust of the drive motor 33 on the push rod 31 will be increased to F2. If the drive motor 33 continues to drive the push rod 31 to operate at this time, the rubber plug 22 will be pushed to operate, and the static friction between the rubber plug 22 and the inner wall of the cartridge bottle 21 will be changed to dynamic friction, that is, the driving force F of the drive motor 33 becomes a value less than F2 and greater than F1. It is determined that the push rod 31 abuts against the rubber plug 22, and the drive motor 33 stops running, and the position of the push rod 31 at this time is set as the initial injection position.

[0037] At this time, if the control knob 4 is short-pressed, the driving motor 33 will drive the push rod 31 to drive the rubber plug 22 to run a single stroke of 1-3 mm, so as to discharge the excess air in the cartridge bottle 21.

[0038] Because the cartridge bottle 21 is detachably connected to the medicine loading part 2, it is easy for the cartridge bottle 21 to not be installed in the medicine loading part 2. Therefore, in this embodiment, the injection pen program also includes a second action mode for detecting the presence or absence of the cartridge bottle 21, and the specific operation is as follows:

[0039] When the driving motor 33 drives the push rod 31 to run a stroke D greater than the third preset value D1, the detection value F of the pressure sensor is always less than F2, and it can be determined that the cartridge 21 is not installed in the medicine charging part 2 at this time, or the plug 22 of the current cartridge 21 is already at the front end, that is, the cartridge 21 is empty. Subsequently, the driving motor 33 drives the push rod 31 to run in the reverse direction until it is reset, so that the operator can install or replace the cartridge 21 after removing the medicine charging part 2.

[0040] In both the first action mode and the second action mode, the following situations may occur:

[0041] When the stroke D of the push rod 31 driven by the drive motor 33 is less than the third preset value D1, but the detection value F of the pressure sensor is greater than the second preset value F2, it indicates that a fault has occurred and the push rod 31 is stuck. At this time, the drive motor 33 stops working and issues a fault alarm.

[0042] In other embodiments of the present application, an automatic operation module 5 is further provided for automatic operation in the first action mode and the second action mode. The automatic operation module 5 includes a first detection contact 51 and a second detection contact 52. Figure 1 and Figure 3 As shown, a bottom hole is formed in the axial direction at the bottom of the medicine charging part 2, a first detection contact 51 is a magnet and fixed in the bottom hole of the medicine charging part 2, and a second detection contact 52 is a Hall sensor and fixed on a PCB board disposed inside the injection pen body 1 near the medicine charging part 2. When the medicine charging part 2 is engaged with the end of the injection pen body 1, the distance between the first detection contact 51 and the second detection contact 52 reaches a preset value, and the two are coupled, so that the driving motor 33 automatically runs to perform exhaust or cartridge bottle 21 detection operations.

[0043] In addition, a function key 6 is provided on one side of the injection pen body 1 . Long pressing the function key 6 turns the injection pen on and off, and short pressing the function key 6 controls the return operation of the menu.

[0044] After executing the first action mode, perform initialization settings, rotate and short-press the control knob 4 to set the time, drug information, single injection dose, injection speed and other settings in sequence to complete the pre-injection preparation.

[0045] During the injection operation, the control knob 4 is long pressed, and the driving motor 33 can push the push rod 31 to drive the rubber plug 22 to push out the liquid medicine in the cartridge bottle 21. During the injection, if you want to stop the injection, you can short press the control knob 4 to pause the injection.

[0046] 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 cannot be used 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 the present invention can be implemented in other specific forms without departing from the spirit or basic features 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 limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. An electronic injection pen, characterized in that: It comprises an injection pen body (1) and a control module; The injection pen body (1) is hollow inside, and its front and rear ends are arranged as openings; the front end of the injection pen body (1) is detachably connected to a medicine loading portion (2), and the medicine loading portion (2) is used to load a cartridge bottle (21); a pushing portion (3) is arranged inside the injection pen body (1), and the pushing portion (3) includes a push rod (31), and the push rod (31) can abut against a rubber plug (22) in the cartridge bottle (21) under the drive of a driving motor (33); The control module comprises a pressure sensor arranged in the injection pen body (1), and a control knob (4) arranged at one end of the injection pen body (1) away from the medicine loading portion (2); the pressure sensor is coupled to the drive motor (33) to detect the force exerted by the drive motor (33) on the push rod (31); the control knob (4) has two input signals, rotation and pressing, which are respectively used for switching and confirming the injection pen program; And set the following parameters: the actual detection value F of the pressure sensor, and the first preset value F1 and the second preset value F2, and F1<F2; The push rod (31) has a running stroke D and a third preset value D1; The injection pen program comprises a first action mode, in which the injection pen can perform the following operations: when the push rod (31) driven by the drive motor (33) runs a stroke D < D1, and the detection value F of the pressure sensor = F2 and then F2 ≥ F > F1, the push rod (31) stops running; and each time the control knob (4) is short pressed, the drive motor (33) can drive the push rod (31) to push the rubber plug (22) to run a single stroke of 1-3 mm.

2. The electronic injection pen according to claim 1, characterized in that: The injection pen program also includes a second action mode, until the driving motor (33) drives the push rod (31) to run a stroke D>D1, and the detection value F of the pressure sensor is always less than F2; the injection pen program enters the second action mode and can perform the following operations: The driving motor (33) drives the push rod (31) to run in the reverse direction until it is reset.

3. The electronic injection pen according to claim 2, characterized in that: When the push rod (31) is driven by the drive motor (33) to run a stroke D < D1, and the detection value F of the pressure sensor is > F2, the drive motor (33) stops working and an alarm is sounded.

4. The electronic injection pen according to claim 2, characterized in that: An automatic operation module (5) is also provided, the automatic operation module (5) comprising a first detection contact (51) and a second detection contact (52) respectively fixed in the medicine loading portion (2) and the injection pen body (1); The first detection contact (51) and the second detection contact (52) are coupled when the medicine filling portion (2) is snap-fitted to the injection pen body (1), and the injection pen is capable of executing a corresponding first action mode or a second action mode.

5. The electronic injection pen according to claim 4, characterized in that: The first detection contact (51) and the second detection contact (52) are respectively a magnet and a Hall sensor.

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