Injection Pen

Abstract

The present invention discloses an injection pen, comprising: a housing, the housing defining a housing cavity; a needle insertion assembly, the needle insertion assembly being movably arranged in the housing cavity between a needle insertion position and a needle retracting position; an injection assembly, at least a portion of the injection assembly being connected to the needle insertion assembly, the injection assembly being movable between an initial position and an injection position when the needle insertion assembly is located at the needle insertion position, at least a portion of the injection assembly being formed as a flexible member so as to deform when moving from the initial position to the injection position; and a button assembly, the button assembly being arranged on the housing and being electrically connected to the needle insertion assembly and the injection assembly to control the movement of the needle insertion assembly and the injection assembly. The injection pen according to the embodiment of the present invention improves the linear transmission mode into a flexible transmission mode, effectively shortens the axial length of the injection pen, and further reduces the product's external dimensions, making it easy to carry.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to an injection pen. Background Art

[0002] The existing injection pens on the market have complex structures and high manufacturing costs. In actual use, the injection scheme is relatively complicated and due to the internal structure of the injection pen, a linear transmission method is generally used for transmission injection. However, the transmission method of this structure makes the overall size of the injection pen device larger, which brings many inconveniences during actual use and carrying. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] In view of this, the present invention provides an injection pen, which improves the linear transmission mode into a flexible transmission mode, thereby effectively shortening the axial length of the injection pen, thereby reducing the product's external dimensions and making it easy to carry.

[0005] An injection pen according to an embodiment of the present invention includes: a shell, which defines a accommodating chamber; a needle insertion assembly, which is movably arranged in the accommodating chamber between a needle insertion position and a needle retracting position; an injection assembly, at least a portion of which is connected to the needle insertion assembly, and the injection assembly is movable between an initial position and an injection position when the needle insertion assembly is located at the needle insertion position, and at least a portion of the injection assembly is formed as a flexible member to deform when moving from the initial position to the injection position; and a button assembly, which is arranged on the shell and electrically connected to the needle insertion assembly and the injection assembly to control the movement of the needle insertion assembly and the injection assembly.

[0006] According to the injection pen of the embodiment of the present invention, by setting at least a part of the transmission structure in the injection assembly as a flexible part, the flexible part can undergo flexible deformation during the operation of the injection pen, which can overcome the problem that the existing injection pen can only be driven by a linear transmission structure, thereby effectively shortening the axial transmission distance of the injection pen, and then reducing the overall size of the injection pen product, making it easy to carry.

[0007] According to one embodiment of the present invention, the needle insertion assembly includes: a needle insertion bracket, which is arranged in the accommodating cavity; a needle insertion motor, which is arranged on the needle insertion bracket and extends along the injection direction of the injection pen, and a needle insertion motor shaft is provided at one end of the needle insertion motor, and a needle insertion gear is provided on the needle insertion motor shaft; a needle insertion screw, which extends along the injection direction of the injection pen and is meshed with the needle insertion gear; a needle insertion screw sleeve, which is sleeved on the needle insertion screw and is movable along the axial direction of the needle insertion screw when the needle insertion screw rotates, and the needle insertion screw sleeve is connected to at least a part of the injection assembly to drive the injection assembly to move.

[0008] According to one embodiment of the present invention, the injection assembly includes: an injection bracket, which is movably arranged in the accommodating cavity, and the injection bracket is connected to the needle insertion screw sleeve to be driven by the needle insertion screw sleeve; an injection motor, which is arranged on the injection bracket along the injection direction of the injection pen, and an injection motor shaft is arranged at one end of the injection motor, and an injection gear is arranged on the injection motor shaft; an injection screw, which is arranged on one side of the injection motor along the injection direction of the injection pen and meshes with the injection gear; an injection screw A rod sleeve, wherein the injection screw sleeve is sleeved on the injection screw and is movable along the axial direction of the injection screw when the injection screw rotates; a flexible screw, wherein one end of the flexible screw is connected to the injection screw sleeve and is driven by the injection screw sleeve, and the other end of the flexible screw extends to the other side of the injection motor; a refill holder, wherein the refill holder is disposed on the other side of the injection motor, and the medicine bottle of the injection pen is disposed on the refill holder and is adjacent to the other end of the flexible screw, and a rubber plug is disposed in the medicine bottle and the rubber plug is driven by the flexible screw for injection.

[0009] According to one embodiment of the present invention, the injection bracket is formed into a long strip extending along the injection direction of the injection pen, and the injection bracket is provided with an injection motor mounting portion for mounting the injection motor in the middle portion in the width direction thereof, an injection screw mounting portion for mounting the injection screw is provided on one side of the injection bracket, and a refill bracket mounting portion for mounting the refill bracket is provided on the other side of the injection bracket.

[0010] According to one embodiment of the present invention, the injection motor shaft of the injection motor is arranged at one end facing the injection direction, one end of the injection bracket is provided with a through hole for accommodating the injection motor shaft to pass through, and the other end of the injection bracket is provided with a guide groove passing through the injection screw mounting part and the refill bracket mounting part, and the flexible screw is movably arranged in the guide groove along the extension direction of the guide groove.

[0011] According to an embodiment of the present invention, the guide groove is formed in a U-shape, and the flexible lead screw is formed in a U-shape corresponding to the shape of the guide groove.

[0012] According to one embodiment of the present invention, a rigid connecting portion is provided at one end of the flexible screw rod, and a stop portion is provided at the other end of the flexible screw rod, and the injection assembly further includes: a connecting piece, which is connected to the injection screw sleeve, and a fixing portion is provided on the connecting piece, and the fixing portion is detachably connected to the rigid connecting portion.

[0013] According to an embodiment of the present invention, the rigid connection portion is formed in a columnar shape, an annular groove extending along the circumference thereof is provided on the rigid connection portion, and the fixing portion is formed as a buckle engaged with the annular groove.

[0014] According to one embodiment of the present invention, the flexible wire rod is a metal wire rod or a plastic wire rod.

[0015] According to one embodiment of the present invention, the button assembly includes: an injection key control panel, which is arranged in the shell and located at one end of the shell, and is electrically connected to the needle insertion motor and the injection motor; an injection key, which is arranged on the shell and corresponds to the injection key control panel to control the operation of the needle insertion motor and the injection motor.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is an exploded view of an injection pen according to an embodiment of the present invention;

[0019] Figure 2 An exploded view of a needle insertion assembly of an injection pen according to an embodiment of the present invention;

[0020] Figure 3 An exploded view of an injection assembly of an injection pen according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Injection pen 100;

[0023] Housing 10;

[0024] Needle insertion assembly 20; needle insertion bracket 21; needle insertion motor 22; needle insertion screw rod 23; needle insertion screw rod sleeve 24;

[0025] Injection assembly 30; injection bracket 31; injection motor 32; injection screw 33; injection screw sleeve 34;

[0026] Flexible screw rod 35; rigid connecting portion 351; stop portion 352;

[0027] Pen core holder 36; injection gear 37;

[0028] Connecting member 38; fixing portion 381; medicine bottle 39;

[0029] Key assembly 40; injection key control panel 41; injection key 42;

[0030] End cap 50. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] An injection pen 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0035] like Figures 1 to 3 As shown, the injection pen 100 according to an embodiment of the present invention includes a housing 10 , a needle insertion assembly 20 , an injection assembly 30 and a button assembly 40 .

[0036] Specifically, the shell 10 defines a accommodating cavity, and the needle insertion assembly 20 is movably disposed in the accommodating cavity between a needle insertion position and a needle retracting position. At least a portion of the injection assembly 30 is connected to the needle insertion assembly 20. The injection assembly 30 is movable between an initial position and an injection position when the needle insertion assembly 20 is located at the needle insertion position. At least a portion of the injection assembly 30 is formed as a flexible member so as to deform when moving from the initial position to the injection position. The button assembly 40 is disposed on the shell 10 and is electrically connected to the needle insertion assembly 20 and the injection assembly 30 to control the movement of the needle insertion assembly 20 and the injection assembly 30.

[0037] In other words, according to the embodiment of the present invention, the shell 10 of the injection pen 100 is provided with a accommodating chamber, and the needle insertion assembly 20 and the injection assembly 30 which are connected to each other are provided in the accommodating chamber. The needle insertion assembly 20 can be movably adjusted between the injection position and the initial position. At the same time, at least a part of the injection assembly 30 used for transmission is made of flexible material to form a flexible part. The flexible part can drive the injection assembly to move through flexible deformation, thereby avoiding the problem that the existing injection assembly can only be driven by a linear driving member.

[0038] It should also be noted that the housing 10 according to the embodiment of the present invention can be assembled from an upper housing and a lower housing, an injection pen 100 is arranged inside the housing 10, an end cap 50 is sleeved on one end of the housing 10, and an injection through hole is arranged on the surface of the end cap 50 along its thickness direction, which is used to protect the injection assembly 30 and the needle insertion assembly 20. A key assembly 40 is arranged at the other end of the housing 10, and a main control board is arranged inside the housing 10, which is connected to the key assembly 40 and controls the operation of the needle insertion assembly 20 and the injection assembly 30 according to the control signal of the key assembly 40. A display panel that can display injection information is also arranged on the upper housing, and these structures are understandable and easy to implement for those skilled in the art, so they are not described in detail.

[0039] Therefore, according to the injection pen 100 of the embodiment of the present invention, by setting at least a part of the transmission structure in the injection assembly 30 as a flexible part, the flexible part can undergo flexible deformation during the operation of the injection pen 100, which can overcome the problem that the existing injection pen can only be driven by a linear transmission structure, thereby effectively shortening the axial transmission distance of the injection pen, and then reducing the overall size of the injection pen product, making it easy to carry.

[0040] According to one embodiment of the present invention, the needle insertion assembly 20 includes a needle insertion bracket 21 , a needle insertion motor 22 , a needle insertion screw 23 and a needle insertion screw sleeve 24 .

[0041] Specifically, the needle insertion bracket 21 is arranged in the accommodating cavity; the needle insertion motor 22 is arranged on the needle insertion bracket 21 extending along the injection direction of the injection pen 100, and a needle insertion motor 22 shaft is provided at one end of the needle insertion motor 22, and a needle insertion gear is provided on the needle insertion motor 22 shaft; the needle insertion screw 23 extends along the injection direction of the injection pen 100 and is meshed with the needle insertion gear; the needle insertion screw sleeve 24 is sleeved on the needle insertion screw 23 and is movable along the axial direction of the needle insertion screw 23 when the needle insertion screw 23 rotates, and the needle insertion screw sleeve 24 is connected to at least a part of the injection assembly 30 to drive the injection assembly 30 to move.

[0042] like Figure 2 As shown, in the needle insertion assembly 20, the needle insertion motor 22 and the needle insertion screw 23 are engaged and connected through the needle insertion gear. The needle insertion motor 22 is firstly driven to rotate the needle insertion screw 23. Since the needle insertion screw sleeve 24 is sleeved on the needle insertion screw 23, the needle insertion screw sleeve 24 moves along the axial direction of the needle insertion screw 23, thereby driving the entire injection assembly 30 to move, so that the injection assembly 30 completes the needle insertion operation.

[0043] Therefore, the injection pen 100 according to the embodiment of the present invention effectively separates the operations between the needle insertion component 20 and the injection component 30 by independently setting up the injection component 30 and the needle insertion component 20 and connecting them to each other, and at the same time completes the needle insertion step through the connection relationship between the needle insertion component 20 and the injection component 30, thereby improving the overall convenience of the injection pen 100 and facilitating the user to complete the needle insertion with simple operation.

[0044] like Figure 3 As shown, in some specific embodiments of the present invention, the injection assembly 30 includes: an injection bracket 31, an injection motor 32, an injection screw 33, an injection screw sleeve 34, a flexible screw 35 and a refill bracket 36.

[0045] Specifically, the injection bracket 31 is movably arranged in the accommodating cavity, and the injection bracket 31 is connected to the needle screw sleeve 24 to be driven by the needle screw sleeve 24; the injection motor 32 is extended along the injection direction of the injection pen 100 and is arranged on the injection bracket 31, and an injection motor 32 shaft is arranged at one end of the injection motor 32, and an injection gear 37 is arranged on the injection motor 32 shaft; the injection screw 33 is extended along the injection direction of the injection pen 100 and is arranged on one side of the injection motor 32 and meshed with the injection gear 37; The injection screw sleeve 34 is sleeved on the injection screw 33 and is movable along the axial direction of the injection screw 33 when the injection screw 33 rotates; one end of the flexible screw 35 is connected to the injection screw sleeve 34 and driven by the injection screw sleeve 34, and the other end of the flexible screw 35 extends to the other side of the injection motor 32; the refill bracket 36 is arranged on the other side of the injection motor 32, and the medicine bottle 39 of the injection pen 100 is arranged on the refill bracket 36 and adjacent to the other end of the flexible screw 35. There is a rubber plug inside. The injection is performed by being driven by a flexible lead screw 35 .

[0046] Among them, the reason why the medicine bottle 39 is provided with a rubber plug near the other end of the flexible screw rod 35 is that in the initial state, the flexible screw rod needs to be reset to the initial position before the medicine bottle 39 can be installed in the injection bracket 31, and then after the injection motor 32 is started, the injection screw rod sleeve 34 also moves on the injection screw rod 33, and at the same time drives the flexible screw rod 35 to move. After the flexible screw rod 35 moves for a period of time after being driven by the injection motor 32, one end of the flexible screw rod 35 stops at the rubber plug in the medicine bottle 39, and then the injection step is completed. At the same time, an injection guide rod is also provided in the injection bracket 31, and the injection guide rod is set to fix the connecting piece 38.

[0047] In other words, an injection bracket 31 is arranged in the accommodating cavity, the injection bracket 31 is connected to the needle insertion screw sleeve 24 in the needle insertion assembly 20, and an injection motor 32 is arranged in the injection bracket 31, the injection motor 32 is connected to the injection screw 33 through the injection gear 37, and the injection screw sleeve 34 is sleeved on the injection screw 33. Driven by the injection motor 32, the injection screw sleeve 34 also moves on the injection screw 33, and at the same time drives the flexible screw 35 to move. The stopper 352 on one end of the flexible screw 35 stops the rubber plug in the medicine bottle 39 after being driven, and then the rubber plug in the medicine bottle 39 is driven by the flexible screw 35 to move axially along the medicine bottle 39, thereby completing the injection.

[0048] Therefore, according to the injection pen 100 of the embodiment of the present invention, a flexible screw 35 is arranged in the injection component 30. Since the flexible screw 35 can be bent in the accommodating cavity in the injection bracket 31, the injection motor 32 drives the injection screw sleeve 34 to make the flexible screw 35 flexibly transmitted, and the rubber plug in the medicine bottle 39 is driven by the flexible screw 35 to complete the injection step. This structural arrangement is transmitted through the flexible screw 35, and at the same time, the internal structure of the injection component 30 can be effectively optimized, so that the axial distance of the injection pen 100 transmission is effectively shortened, thereby reducing the overall external dimensions of the injection pen 100 product, making it easy to carry.

[0049] Furthermore, the injection bracket 31 is formed into a long strip extending along the injection direction of the injection pen 100, and an injection motor 32 mounting portion for mounting the injection motor 32 is provided in the middle portion of the injection bracket 31 in the width direction, an injection screw 33 mounting portion for mounting the injection screw 33 is provided on one side of the injection bracket 31, and a refill bracket 36 mounting portion for mounting the refill bracket 36 is provided on the other side of the injection bracket 31. By optimizing the structure inside the injection bracket 31 and improving the structural characteristics of the injection bracket 31, the overall structural volume of the injection pen 100 is shortened and its portability is improved.

[0050] According to one embodiment of the present invention, the injection motor 32 shaft of the injection motor 32 is arranged at one end facing the injection direction, one end of the injection bracket 31 is provided with a through hole for accommodating the injection motor 32 shaft to pass through, and the other end of the injection bracket 31 is provided with a guide groove passing through the injection screw 33 mounting part and the refill bracket 36 mounting part, and the flexible screw 35 is movably arranged in the guide groove along the extension direction of the guide groove.

[0051] That is to say, by fixing one end of the injection motor 32 to the through hole, the stability of the motor during use is improved, and at the same time, a guide groove for installing the flexible screw rod 35 is provided inside the injection bracket 31, so that the flexible screw rod 35 moves along the guide groove during the driving process, thereby achieving good control of the transmission direction of the flexible screw rod 35.

[0052] According to an embodiment of the present invention, the guide groove is formed into a U-shape, and the flexible screw rod 35 is formed into a U-shape corresponding to the shape of the guide groove. Therefore, by setting the guide groove and the flexible screw rod 35 into a U-shaped structure, the flexible screw rod 35 can reciprocate in the guide groove, and the two ends of the flexible screw rod 35 are respectively located on both sides of the injection bracket 31. This structure can optimize the structural design of the flexible screw rod 35 as much as possible on the basis of ensuring the normal operation of the injection pen 100, thereby reducing the volume of the injection pen 100 and greatly improving its portability.

[0053] Furthermore, a rigid connection portion 351 is provided at one end of the flexible screw rod 35, and a stop portion 352 is provided at the other end of the flexible screw rod 35. The injection assembly 30 also includes: a connecting member 38, the connecting member 38 is connected to the injection screw sleeve 34, and a fixing portion 381 is provided on the connecting member 38, and the fixing portion 381 is detachably connected to the rigid connection portion 351.

[0054] Among them, the injection assembly 30 is also provided with an injection guide rod and a part of the connecting piece 38 is sleeved on the injection guide rod, and the other part is connected to the rigid connecting part 351. At the same time, the connecting piece 38 is also connected to the injection screw sleeve 34. The connection method can be a snap connection or a bolt hole connection. Different connection methods can be designed so that the injection screw sleeve 34 drives the connecting piece 38 to move axially along the guide rod while driving the flexible screw 35 to move to complete the injection step.

[0055] That is to say, by providing the rigid connection part 351 and the stop part 352, the injection pen 100 can drive the stopper in the medicine bottle 39 through the stop part 352 during actual use, and at the same time, the rigid connection part 351 is detachably connected to the fixing part 381, which can not only effectively connect and fix, but also provide convenience in the subsequent maintenance and repair of the injection pen 100.

[0056] In some specific embodiments of the present invention, the rigid connection part 351 is formed in a columnar shape, and an annular groove extending along its circumference is provided on the rigid connection part 351. The fixing part 381 is formed to be clamped with the annular groove. By effectively clamping the fixing part 381 with the rigid connection part 351, one end of the flexible screw rod 35 is fixed, thereby improving its stability performance during the transmission process.

[0057] According to one embodiment of the present invention, the flexible wire rod 35 is a metal wire rod or a plastic wire rod. The flexible wire rod 35 made of the metal wire rod or the plastic wire rod is inexpensive and has a simple manufacturing process, which effectively reduces assembly costs and improves manufacturing efficiency.

[0058] Furthermore, the button assembly 40 includes an injection button control panel 41 and an injection button 42. The injection button control panel 41 is disposed in the shell 10 and is located at one end of the shell 10. The injection button control panel 41 is electrically connected to the needle insertion motor 22 and the injection motor 32. The injection button 42 is disposed on the shell 10 and corresponds to the injection button control panel 41 to control the operation of the needle insertion motor 22 and the injection motor 32. That is, the needle insertion and injection operations of the injection pen 100 can be achieved by pressing a button once, thereby simplifying the operating steps and improving the usage performance.

[0059] The working process of the injection pen 100 according to the embodiment of the present invention is described in detail below.

[0060] According to the injection pen 100 of the embodiment of the present invention, when the user needs to inject, the user presses the injection key 42. After the injection key control panel 41 detects the pressing signal of the injection key 42, it controls the needle insertion motor 22 to rotate. Due to the start-up of the needle insertion motor 22, the needle insertion gear rotates and drives the end gear of the needle insertion screw 23 to rotate synchronously. Since the needle insertion screw 23 is clamped on the needle insertion screw 23 bracket and the needle insertion screw 23 cannot move axially, the needle insertion screw sleeve 24 mounted on the needle insertion screw 23 moves axially with the rotation of the needle insertion screw 23, and the axial movement of the needle insertion screw sleeve 24 drives the injection bracket 31 to move synchronously, thereby completing the needle insertion step.

[0061] After the needle insertion step is completed, the injection motor 32 starts to start, and then the end gear of the injection motor 32 rotates to drive the injection gear 37 to rotate synchronously in the opposite direction. The injection gear 37 then drives the end gear of the injection screw 33 to rotate synchronously in the opposite direction. The injection screw 33 and its end gear rotate synchronously in the same direction. Since the injection screw sleeve 34 is sleeved on the injection screw 33, the injection screw sleeve 34 cannot rotate and can only move along the axial direction of the injection screw 33. At the same time, the injection screw sleeve 34 is snap-connected with the connecting piece 38, so that the connecting piece 38 is fixed in the flexible At the end of the screw rod 35, the rotation of the injection screw rod 33 will cause the injection screw rod sleeve 34 to move axially, thereby driving the connecting piece 38 to move axially. At this time, the flexible screw rod 35 is fixed to the connecting piece 38, so the flexible screw rod 35 moves synchronously with the connecting piece 38, that is, a part of the flexible screw rod 35 moves in the guide groove of the internal accommodating cavity of the injection bracket 31. After the flexible screw rod 35 moves to the top in the guide groove, the flexible screw rod 35 pushes the plug in the medicine bottle 39 through the thrust generated by the transmission, and the injection step is completed.

[0062] In summary, according to the injection pen 100 of the embodiment of the present invention, by setting at least a part of the transmission structure in the injection assembly 30 as a flexible part, the flexible part can undergo flexible deformation during the operation of the injection pen 100, thereby overcoming the problem that the existing injection pen can only be driven by a linear transmission structure, thereby effectively shortening the axial transmission distance of the injection pen, and then reducing the overall size of the injection pen product, making it easy to carry.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0064] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An injection pen, characterized in that: include: A housing, wherein the housing defines a receiving cavity; A needle insertion assembly, the needle insertion assembly being movably disposed in the accommodating cavity between a needle insertion position and a needle retracting position; an injection assembly, at least a portion of which is connected to the needle insertion assembly, the injection assembly being movable between an initial position and an injection position when the needle insertion assembly is located at the needle insertion position, and at least a portion of the injection assembly being formed as a flexible member so as to deform when moving from the initial position to the injection position; A button assembly, which is disposed on the housing and is electrically connected to the needle insertion assembly and the injection assembly to control the activities of the needle insertion assembly and the injection assembly; The needle insertion assembly comprises: A needle insertion bracket, the needle insertion bracket is arranged in the accommodating cavity; A needle insertion motor, the needle insertion motor is arranged on the needle insertion bracket so as to extend along the injection direction of the injection pen, a needle insertion motor shaft is arranged at one end of the needle insertion motor, and a needle insertion gear is arranged on the needle insertion motor shaft; A needle insertion screw rod, the needle insertion screw rod extends along the injection direction of the injection pen and meshes with the needle insertion gear; A needle screw sleeve, which is sleeved on the needle screw and is movable along the axial direction of the needle screw when the needle screw rotates, and is connected to at least a part of the injection assembly to drive the injection assembly to move; The injection assembly comprises: An injection bracket, the injection bracket is movably arranged in the accommodating cavity, and the injection bracket is connected to the needle insertion screw sleeve to be driven by the needle insertion screw sleeve; An injection motor, the injection motor is arranged on the injection bracket so as to extend along the injection direction of the injection pen, an injection motor shaft is arranged at one end of the injection motor, and an injection gear is arranged on the injection motor shaft; An injection screw, which is arranged on one side of the injection motor and extends along the injection direction of the injection pen and is meshed with the injection gear; An injection screw sleeve, wherein the injection screw sleeve is sleeved on the injection screw and is movable along the axial direction of the injection screw when the injection screw rotates; A flexible screw, one end of which is connected to the injection screw sleeve and driven by the injection screw sleeve, and the other end of which extends to the other side of the injection motor; A refill holder, the refill holder is arranged on the other side of the injection motor, the medicine bottle of the injection pen is arranged on the refill holder and adjacent to the other end of the flexible screw, a rubber plug is arranged in the medicine bottle and the rubber plug is driven by the flexible screw to perform injection; An injection guide rod is also arranged in the injection bracket.

2. The injection pen according to claim 1, characterized in that: The injection bracket is formed into a long strip extending along the injection direction of the injection pen, and an injection motor mounting portion for mounting the injection motor is provided in the middle portion of the injection bracket in the width direction, an injection screw mounting portion for mounting the injection screw is provided on one side of the injection bracket, and a refill bracket mounting portion for mounting the refill bracket is provided on the other side of the injection bracket.

3. The injection pen according to claim 2, characterized in that: The injection motor shaft of the injection motor is arranged at one end facing the injection direction, one end of the injection bracket is provided with a through hole for accommodating the injection motor shaft to pass through, and the other end of the injection bracket is provided with a guide groove that passes through the injection screw mounting part and the refill bracket mounting part, and the flexible screw is movably arranged in the guide groove along the extension direction of the guide groove.

4. The injection pen according to claim 3, characterized in that: The guide groove is formed in a U shape, and the flexible lead screw is formed in a U shape corresponding to the shape of the guide groove.

5. The injection pen according to claim 1, characterized in that: One end of the flexible screw rod is provided with a rigid connection portion, and the other end of the flexible screw rod is provided with a stop portion. The injection assembly further includes: A connecting piece is connected to the injection screw sleeve, and a fixing part is provided on the connecting piece, and the fixing part is detachably connected to the rigid connecting part.

6. The injection pen according to claim 5, characterized in that: The rigid connection part is formed in a columnar shape, and an annular groove extending along the circumference thereof is provided on the rigid connection part, and the fixing part is formed as a buckle engaged with the annular groove.

7. The injection pen according to any one of claims 1 to 6, characterized in that: The flexible screw rod is a metal screw rod or a plastic screw rod.

8. The injection pen according to claim 1, characterized in that: The button assembly comprises: An injection key control panel, the injection key control panel is arranged in the housing and located at one end of the housing, and the injection key control panel is electrically connected to the needle insertion motor and the injection motor; An injection key is arranged on the housing and corresponds to the injection key control panel to control the needle insertion motor and the injection motor to work.

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