Medical injection pen

Abstract

The present invention provides a medical injection pen, which includes a pen barrel, a pressing assembly, a transmission assembly and an injection assembly; the interior of the pen barrel is divided into an installation channel and a liquid injection channel; the pressing assembly includes a digital barrel, a sliding barrel and a pressing head, the screwing part is rotatably arranged at the upper end of the installation channel, the pressing head is arranged on the screwing part, the sliding barrel is slidably arranged inside the digital barrel and is in transmission connection with the pressing head; the transmission assembly includes a push rod and a transmission ring, the transmission ring is slidably arranged inside the sliding barrel; the inner wall of the transmission ring is in threaded cooperation with the push rod, and a limiting protrusion is arranged at the upper end of the push rod, and the limiting protrusion can cooperate with the upper end surface of the transmission ring; the injection assembly has a cartridge. For the medical injection pen provided by the present invention, after the injection is completed, the limiting protrusion at the upper end of the push rod abuts against the transmission rod up and down, resulting in the patient being unable to externally screw the digital barrel, so as to remind the patient to replace the injection pen.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a medical injection pen. Background Art

[0002] When treating some diseases for patients, generally a syringe is used to directly inject the medicine into human tissues to achieve an effective treatment effect. An injection pen is a type of syringe, which is a medical device that can automatically inject the liquid medicine pre-filled in the injection barrel into the patient's body, can meet the needs of users for self-medication, and reduce the number of times patients travel back and forth for treatment.

[0003] After the liquid medicine in a single injection pen is used up, the injection pen needs to be discarded to avoid cross-infection caused by repeated use. Since the inside of the injection pen is not visible, it is difficult for patients to judge whether the liquid medicine has been used up, which affects the patient's judgment, and even the situation where an empty injection pen is inserted into the human body, resulting in injection failure; patients cannot replace or purchase a new injection pen in time, which affects the treatment effect of patients and brings inconvenience to patients. Summary of the Invention

[0004] An embodiment of the present invention provides a medical injection pen, aiming to solve the problem in the prior art that the injection pen cannot timely remind the patient to replace it after the liquid medicine is used up, which affects the treatment of the patient.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] Provide a medical injection pen, including:

[0007] A pen barrel, with a limiting part inside. The limiting part divides the inside of the pen barrel into an installation channel and a liquid injection channel distributed in the up and down directions. A through hole is opened in the middle of the limiting part;

[0008] A pressing assembly, including a digital cylinder, a sliding cylinder, and a pressing head. A screwing part is formed at the upper end of the digital cylinder. The screwing part is rotatably arranged at the upper end of the installation channel. The outer periphery of the digital cylinder is in threaded cooperation with the side wall of the installation channel. The pressing head is slidably arranged on the screwing part. The sliding cylinder is only slidably arranged along the axis of the installation channel inside the digital cylinder, and the top end of the sliding cylinder is in transmission connection with the pressing head;

[0009] A transmission assembly, comprising a push rod and a transmission ring, wherein the transmission ring is slidably arranged inside the sliding cylinder along the axis of the installation channel, and a circumferential limiter is arranged on the inner wall of the sliding cylinder, and the circumferential limiter is used to limit the rotation of the transmission ring relative to the sliding cylinder in the circumferential direction; the inner wall of the transmission ring is threadedly matched with the push rod, and the push rod passes through the limiter and extends into the injection channel, and a limit protrusion is arranged on the upper end of the push rod, and the limit protrusion can be matched with the upper end surface of the transmission ring to limit the axial displacement of the push rod when the liquid medicine is exhausted; and

[0010] The injection assembly comprises a cartridge bottle which is clamped at the opening of the injection channel, and the piston of the cartridge bottle is in contact with the push rod.

[0011] In a possible implementation, the pressing assembly also includes a bushing, which is fixed at the opening of the installation channel, the inner wall of the bushing is provided with an internal thread, the outer periphery of the digital tube is provided with a thread groove corresponding to the internal thread, and the internal thread is threadably matched with the thread groove.

[0012] In a possible implementation, the transmission assembly further includes:

[0013] A transmission member, one end of which is connected to the upper end of the sliding cylinder, and the other end of which is slidably connected to the pressing head;

[0014] An elastic member, two ends of which are respectively connected to the pressing head and the transmission member; and

[0015] A push plate is arranged at one end of the push rod away from the pressing head, and the push plate abuts against the piston of the cartridge bottle.

[0016] In a possible implementation, a guide sleeve is provided at one end of the transmission member facing the pressing head, the pressing head is arranged on a guide column corresponding to the guide sleeve, the guide column is plugged into the guide sleeve, and the elastic member is simultaneously sleeved on the outer periphery of the guide column and the guide sleeve.

[0017] In a possible implementation, an anti-disengagement hook is provided on the outer periphery of one end of the pressing head facing the digital tube, and the digital tube is provided with an anti-disengagement groove corresponding to the anti-disengagement hook, and the anti-disengagement hook is engaged with the anti-disengagement groove to limit the displacement of the pressing head on the axis of the installation channel.

[0018] In a possible implementation, the circumferential limit member includes a guide protrusion provided on the outer circumference of the transmission ring and a guide groove provided on the inner wall of the sliding cylinder, the guide groove extends along the axis of the sliding cylinder, and the guide protrusion and the guide groove slide up and down in cooperation.

[0019] In a possible implementation, a reading port is provided on the outer periphery of the pen container, and the reading port communicates with the installation channel. A scale is provided on the outer wall of the digital cylinder.

[0020] In a possible implementation, the medical injection pen further includes a sound generating assembly, and the sound generating assembly includes:

[0021] A sound generating member, fixedly arranged in the liquid injection channel. A sound groove is provided at the upper end of the sound generating member, and a toothed ring is provided on the groove wall of the sound groove. The sound groove and the limiting portion enclose a fixed space;

[0022] A striking ring, rotatably arranged in the fixed space. The inner wall of the striking ring is in threaded cooperation with the push rod. A striking arm is provided on the outer periphery of the striking ring, and the striking arm contacts the toothed ring; and

[0023] A transmission gear, arranged between the striking ring and the sliding cylinder. The upper and lower ends of the transmission gear can be respectively engaged with the striking ring and the sliding cylinder.

[0024] In a possible implementation, the transmission assembly further includes a pen cap, and the pen cap covers the outer periphery of the injection assembly and is connected to the bottom opening of the liquid injection channel.

[0025] In a possible implementation, the injection assembly further includes a pen core holder, the cartridge is clamped inside the pen core holder, and the top of the pen core holder is clamped on the inner wall of the liquid injection channel.

[0026] Compared with the prior art, the medical injection pen provided by the present invention provides a new transmission method. The digital cylinder circumferentially limits the sliding cylinder through the circumferential limiting portion. The sliding cylinder is connected to the push rod through the transmission ring, and the top of the sliding cylinder is also in transmission connection with the pressing head; when the patient adjusts the injection dose, the digital cylinder is rotated. At this time, the transmission ring rotates with the sliding cylinder, and the transmission ring rises relative to the push rod; when injecting, the patient pushes the pressing head downward, the pressing head drives the sliding cylinder to descend, the sliding cylinder descending drives the transmission ring to descend. Since the inner wall of the transmission ring is screwed to the push rod, at this time, the descending of the transmission ring drives the push rod to descend, pushing the liquid in the cartridge to change, realizing injection; when the injection is completed, the limiting protrusion at the upper end of the push rod abuts against the transmission rod up and down, causing the patient to be unable to externally rotate the digital cylinder, realizing reminding the patient to replace the injection pen. The whole process is simple. With each injection of the liquid medicine, the transmission ring rises relative to the push rod, which can timely remind the patient. The whole process is mechanical transmission, with simple operation and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 The front view structural schematic diagram of the medical injection pen provided by the embodiment of the present invention;

[0029] Figure 2 For Figure 1 The sectional view;

[0030] Figure 3 For Figure 2 The structural schematic diagram of the sound component adopted in

[0031] Figure 4 For Figure 1 The structural schematic diagram of the digital cylinder adopted in

[0032] Figure 5 For Figure 2 The structural schematic diagram of the transmission component adopted in

[0033] Figure 6 For Figure 2 The assembly schematic diagram of the digital cylinder and the bushing adopted in

[0034] Figure 7 For Figure 2 The assembly schematic diagram of the sliding cylinder and the transmission ring adopted in

[0035] Figure 8 For Figure 2 The structural schematic diagram of the sliding cylinder adopted in

[0036] Figure 9 For Figure 2 The structural schematic diagram of the sound part and the striking ring adopted in

[0037] Figure 10 For Figure 1 The sectional assembly view of the digital cylinder and the pressing head adopted in

[0038] Figure 11 For Figure 2 The sectional view of the transmission component adopted in

[0039] Explanation of the reference numerals:

[0040] 1. Pen barrel; 11. Limiting part; 12. Reading port;

[0041] 2. Pressing Assembly; 21. Digital Cylinder; 211. Screwing Part; 212. Anti - detachment Groove; 22. Sliding Cylinder; 221. Guide Groove; 23. Pressing Head; 231. Guide Post; 232. Anti - detachment Hook; 24. Bushing

[0042] 3. Transmission Assembly; 31. Push Rod; 311. Limit Projection; 32. Push Plate; 33. Transmission Ring; 331. Guide Projection; 34. Transmission Part; 341. Guide Sleeve; 35. Elastic Part

[0043] 4. Injection Assembly; 41. Cartridge Vial; 42. Cartridge Holder

[0044] 5. Sound - generating Assembly; 51. Sound - generating Part; 511. Tooth Ring; 52. Striking Ring; 521. Striking Arm; 53. Transmission Tooth

[0045] 6. Pen Cap Detailed Implementation Manner

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0048] It should be noted that the terms used herein are only for describing the specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0049] It should be noted that the orientation or positional relationship indicated by terms such as "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings. It is 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. Therefore, it should not be construed as a limitation to the invention. The terms "inner" and "outer" refer to the inside and outside relative to the contour of each component itself.

[0050] It should also be noted that, unless otherwise clearly specified and limited, terms such as "install", "connect", "link", "fix", "set", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways, and corresponding interpretations should be made for the spatial relative descriptions used here.

[0052] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include one or more of such features. In addition, the meanings of "multiple" and "several" are two or more, unless otherwise clearly and specifically defined.

[0053] Please refer to Figures 1 to 11, a medical injection pen provided by the present invention will be described below. The medical injection pen includes a pen barrel 1, a pressing assembly 2, a transmission assembly 3, and an injection assembly 4. A limiting portion 11 is provided inside the pen barrel 1. The limiting portion 11 divides the interior of the pen barrel 1 into an installation channel and a liquid injection channel distributed in the up-and-down direction. A through hole is formed in the middle of the limiting portion 11; the pressing assembly 2 includes a digital cylinder 21, a sliding cylinder 22, and a pressing head 23. A screwing portion 211 is formed at the upper end of the digital cylinder 21. The screwing portion 211 is rotatably provided at the upper end of the installation channel. The outer periphery of the digital cylinder 21 is in threaded cooperation with the side wall of the installation channel. The pressing head 23 is slidably provided on the screwing portion 211. The sliding cylinder 22 is only slidably provided inside the digital cylinder 21 along the axis of the installation channel, and the top end of the sliding cylinder 22 is in transmission connection with the pressing head 23; the transmission assembly 3 includes a push rod 31 and a transmission ring 33. The transmission ring 33 is slidably provided inside the sliding cylinder 22 along the axis of the installation channel. A circumferential limiting member is provided on the inner wall of the sliding cylinder 22. The circumferential limiting member is used to limit the circumferential rotation of the transmission ring 33 relative to the sliding cylinder 22; the inner wall of the transmission ring 33 is in threaded cooperation with the push rod 31. The push rod 31 passes through the limiting portion 11 and extends into the liquid injection channel. A limiting protrusion 311 is provided at the upper end of the push rod 31. The limiting protrusion 311 can cooperate with the upper end surface of the transmission ring 33 to limit the axial displacement of the push rod 31 when the liquid medicine is used up; the injection assembly 4 has a cartridge 41, which is clamped at the opening of the liquid injection channel. The piston of the cartridge 41 abuts against the push rod 31.

[0054] It should be noted that the injection pen in this embodiment has two operations:

[0055] One of the operations is to adjust the injection dose. At this time, the patient operates the screwing portion 211 outward, and the digital cylinder 21 rotates upward. Due to the existence of the circumferential limiting portion, the digital cylinder 21 drives the sliding cylinder 22 to rotate. The sliding cylinder 22 rotates to drive the transmission ring 33 to rotate and rise. The inner wall of the transmission ring 33 is screwed with the push rod 31, and the transmission ring 33 will not drive the push rod 31 to move. By screwing the digital cylinder 21, the displacement distance of the transmission ring 33 is adjusted;

[0056] The other operation is to inject the liquid medicine. At this time, the patient pushes the pressing head 23 downward. The pressing head 23 drives the sliding cylinder 22 to descend. The sliding cylinder 22 descending drives the transmission ring 33 to descend. The transmission ring 33 makes a one-way movement, driving the push rod 31 to rotate downward. The push plate 32 at the bottom end of the push rod 31 pushes the piston of the cartridge 41 to descend, thereby realizing the injection of the liquid medicine from the needle into the patient's body.

[0057] It should be noted that the up and down in this embodiment only refer to the up and down directions in the drawings.

[0058] It should be noted that the cartridge 41 has a piston. By pushing the piston, the volume of the liquid changes to perform the injection operation, which is the prior art, and the specific principle will not be elaborated here.

[0059] It should be noted that when the transmission ring 33 rotates out of the limit of the inner wall of the sliding cylinder 22 or contacts the limit protrusion 311, the pressing down cannot be achieved. In both cases, the transmission ring 33 cannot be pressed down to remind the patient to replace the new injection pen.

[0060] Compared with the prior art, the medical injection pen provided in this embodiment provides a new transmission method. The digital cylinder 21 circumferentially limits the sliding cylinder 22 through the circumferential limiting portion 11. The sliding cylinder 22 is connected to the push rod 31 through the transmission ring 33. The top of the sliding cylinder 22 is also drivingly connected to the pressing head 23. When the patient adjusts the injection dose, the digital cylinder 21 is rotated. At this time, the transmission ring 33 rotates with the sliding cylinder 22, and the transmission ring 33 rises relative to the push rod 31. When injecting, the patient pushes the pressing head 23 downward. The pressing head 23 drives the sliding cylinder 22 to descend. The descending of the sliding cylinder 22 drives the transmission ring 33 to descend. Since the inner wall of the transmission ring 33 is screwed with the push rod 31, at this time, the descending of the transmission ring 33 drives the push rod 31 to descend, pushing the liquid in the cartridge 41 to change, and realizing the injection. When the injection is completed, the limit protrusion 311 at the upper end of the push rod 31 abuts against the transmission rod up and down, resulting in the patient being unable to externally rotate the digital cylinder 21, realizing the reminder for the patient to replace the injection pen. The whole process is simple. With each injection of the liquid medicine, the transmission ring 33 rises relative to the push rod 31, which can timely remind the patient. The whole process is mechanical transmission, with simple operation and high reliability.

[0061] In some embodiments, refer to Figure 2 and Figure 5 , the pressing assembly 2 further includes a bushing 24. The bushing 24 is fixedly arranged at the opening of the installation channel. The inner wall of the bushing 24 is provided with internal threads, and the outer circumference of the digital cylinder 21 is provided with thread grooves corresponding to the internal threads. The internal threads are in threaded cooperation with the thread grooves. The bushing 24 is fixed in the pen barrel 1. Through the threaded cooperation between the bushing and the digital cylinder 21, the inner wall of the pen barrel 1 does not need to be provided with internal threads, which can reduce the manufacturing difficulty of the pen barrel 1. The wall thickness of the pen barrel 1 can be reduced, which is beneficial to reducing the manufacturing cost of the pen barrel 1, reducing the overall weight of the injection pen, and facilitating the use of the patient.

[0062] In some embodiments, refer to Figure 2 and Figure 3, the transmission assembly 3 further includes a transmission member 34, an elastic member 35, and a push plate 32. One end of the transmission member 34 is connected to the upper end of the sliding cylinder 22, and the other end is slidably connected to the pressing head 23; both ends of the elastic member 35 are respectively connected to the pressing head 23 and the transmission member 34; the push plate 32 is provided at one end of the push rod 31 away from the pressing head 23, and the push plate 32 abuts against the piston of the cartridge 41. The transmission member 34 is a connecting member, and both ends of the transmission member 34 can be respectively adapted to the pressing head 23 and the sliding cylinder 22 to achieve the transmission between the pressing head 23 and the sliding cylinder 22, ensuring that when the patient presses down, the pressing head 23 drives the sliding cylinder 22 to descend normally; the elastic member 35 can automatically push up the pressing head 23 after the patient finishes pressing, and the pressing head 23 automatically returns to its original position, improving the convenience of use. The push plate 32 can increase the contact area between the push rod 31 and the piston of the cartridge 41, so that the piston can be stably pushed, increasing the stability of liquid injection.

[0063] In some embodiments, referring to Figure 10 , a guide sleeve 341 is provided at one end of the transmission member 34 facing the pressing head 23, a guide post 231 is provided on the pressing head 23 corresponding to the guide sleeve 341, the guide post 231 is inserted and matched with the guide sleeve 341, and the elastic member 35 is simultaneously sleeved on the outer peripheries of the guide post 231 and the guide sleeve 341. The settings of the guide sleeve 341 and the guide post 231 can guide the pressing head 23 to move downward, and the pressing head 23 can only move along the axis of the guide sleeve 341, ensuring that the sliding cylinder 22 is stably driven to descend and ensuring the normal operation of the injection pen. The guide sleeve 341 and the guide post 231 can also guide the telescopic direction of the elastic member 35, ensuring that the elastic member 35 stably drives the pressing head 23 to reset.

[0064] In some embodiments, referring to Figure 10 , an anti - detachment hook 232 is provided on the outer periphery of one end of the pressing head 23 facing the digital cylinder 21, an anti - detachment groove 212 is provided on the digital cylinder 21 corresponding to the anti - detachment hook 232, and the anti - detachment hook 232 is snap - fitted with the anti - detachment groove 212 to limit the displacement of the pressing head 23 on the axis of the installation channel. The anti - detachment hook 232 and the anti - detachment groove 212 can be snap - fitted to prevent the pressing head 23 from detaching from the digital cylinder 21, ensuring that the pressing head 23 will not be lost and ensuring the integrity of the injection pen.

[0065] In some embodiments, referring to Figure 6 and Figure 8 , the circumferential limiting member includes a guide protrusion 331 provided on the outer periphery of the transmission ring 33 and a guide groove 221 provided on the inner wall of the sliding cylinder 22. The guide groove 221 extends along the axis of the sliding cylinder 22, and the guide protrusion 331 is slidably engaged with the guide groove 221 up and down. The guide protrusion 331 can only slide along the guide groove 221 to limit the transmission ring 33 circumferentially, preventing the transmission ring 33 from rotating relative to the sliding cylinder 22 and ensuring stable transmission.

[0066] In some embodiments, referring to Figure 1The outer circumference of the pen barrel 1 is provided with a reading port 12, which is connected to the installation channel, and the outer wall of the digital tube 21 is provided with a scale. The setting of the reading port 12 can display the corresponding scale of the outer circumference of the digital tube 21, so that the patient can clearly and accurately know the dose adjusted by himself when adjusting by himself, ensure that the drug dose of a single injection is appropriate, facilitate the patient's self-medication treatment, and increase the convenience and reliability of use.

[0067] In some embodiments, see Figure 2 , Figure 3 and Figure 9 The medical injection pen further includes a sound component 5, which includes a sound piece 51, a striking ring 52 and a transmission tooth 53. The sound piece 51 is fixed in the injection channel, and a sound groove is provided at the upper end of the sound piece 51, and a tooth ring 511 is provided on the groove wall of the sound groove. The sound groove and the limiting part 11 are enclosed to form a fixed space; the striking ring 52 is rotatably arranged in the fixed space, and the inner wall of the striking ring 52 is threadedly matched with the push rod 31, and a striking arm 521 is provided on the outer periphery of the striking ring 52, and the striking arm 521 is in contact with the tooth ring 511; the transmission tooth 53 is arranged between the striking ring 52 and the sliding cylinder 22, and the upper and lower ends of the transmission tooth 53 can be respectively engaged with the striking ring 52 and the sliding cylinder 22.

[0068] It should be noted that the teeth at the upper and lower ends of the transmission tooth 53 are respectively inclined along the circumferential direction of the transmission tooth to ensure that when the sliding cylinder 22 rotates forward, the sliding cylinder 22 can drive the transmission tooth 53 to rotate, and the transmission tooth 53 drives the striking ring 52 to rotate; when the sliding cylinder 22 rotates reversely, the transmission tooth 53 and the sliding cylinder 22 will jump teeth, and the sliding cylinder 22 will not drive the striking ring 52 to rotate.

[0069] The sound assembly 5 provided in this example has three parts. The driving gear 53 enables the striking ring 52 and the sliding cylinder 22 to achieve transmission connection. When the push rod 31 descends, the push rod 31 and the striking ring 52 are threadedly matched, and the striking ring 52 will rotate. When the striking ring 52 rotates, the striking arm 521 continuously strikes the gear ring 511, making a sound to remind the patient. The sound assembly 5 can assist the patient in use, greatly improves the convenience, and ensures the stability of single adjustment and injection.

[0070] In some embodiments, see Figure 1 The transmission assembly 3 further includes a cap 6, which is covered on the outer periphery of the injection assembly 4 and connected to the bottom opening of the injection channel. The cap 6 can cover the entire injection assembly 4, thereby improving the protection and sealing effect of the cartridge bottle 41. After the cap 6 is covered, a closed space is formed to prevent the drug solution from being contaminated and ensure the quality of the drug solution.

[0071] In some embodiments, see Figure 2, the injection assembly 4 further includes a cartridge holder 42, the cartridge 41 is clamped inside the cartridge holder 42, and the top of the cartridge holder 42 is clamped to the inner wall of the liquid injection channel. The cartridge holder 42 can protect the outer periphery of the cartridge 41 to avoid being knocked and damaged, improve the protection of the liquid medicine, and the cartridge holder 42 can also fix the cartridge 41 to improve the injection stability.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A medical injection pen, characterized in that, Comprising: A pen barrel, with a limiting part inside. The limiting part divides the interior of the pen barrel into an installation channel and a liquid injection channel distributed in the up-and-down direction. A through hole is formed in the middle of the limiting part; A pressing assembly, including a digital cylinder, a sliding cylinder, and a pressing head. A screwing part is formed at the upper end of the digital cylinder. The screwing part is rotatably arranged at the upper end of the installation channel. The outer periphery of the digital cylinder is in threaded cooperation with the side wall of the installation channel. The pressing head is slidably arranged on the screwing part. The sliding cylinder is only slidably arranged along the axis of the installation channel inside the digital cylinder, and the top end of the sliding cylinder is in driving connection with the pressing head; A transmission assembly, including a push rod and a transmission ring. The transmission ring is slidably arranged along the axis of the installation channel inside the sliding cylinder. A circumferential limiting part is arranged on the inner wall of the sliding cylinder, and the circumferential limiting part is used to limit the circumferential rotation of the transmission ring relative to the sliding cylinder; the inner wall of the transmission ring is in threaded cooperation with the push rod. The push rod passes through the limiting part and extends into the liquid injection channel. A limiting protrusion is arranged at the upper end of the push rod, and the limiting protrusion can cooperate with the upper end surface of the transmission ring to limit the axial displacement of the push rod when the liquid medicine is used up; And An injection assembly, having a cartridge, which is clamped at the opening of the liquid injection channel. The piston of the cartridge abuts against the push rod; The transmission assembly further includes: A transmission part, one end is connected to the upper end part of the sliding cylinder, and the other end is slidably connected to the pressing head; An elastic part, with both ends respectively connected to the pressing head and the transmission part; and A push plate, arranged at the end of the push rod away from the pressing head, and the push plate abuts against the piston of the cartridge; The medical injection pen further includes a sound component, and the sound component includes: A sound part, fixedly arranged in the liquid injection channel. A sound groove is formed at the upper end of the sound part. A toothed ring is arranged on the groove wall of the sound groove. The sound groove and the limiting part enclose a fixed space; A striking ring, rotatably arranged in the fixed space. The inner wall of the striking ring is in threaded cooperation with the push rod. A striking arm is arranged on the outer periphery of the striking ring, and the striking arm contacts the toothed ring; and A transmission gear, arranged between the striking ring and the sliding cylinder. The upper and lower ends of the transmission gear can be respectively meshed with the striking ring and the sliding cylinder.

2. The medical injection pen according to claim 1, characterized in that, The pressing assembly further includes a bushing, which is fixedly arranged at the opening of the installation channel. Internal threads are arranged on the inner wall of the bushing. Thread grooves corresponding to the internal threads are arranged on the outer periphery of the digital cylinder, and the internal threads are in threaded cooperation with the thread grooves.

3. The medical injection pen according to claim 1, wherein, A guide sleeve is arranged at the end of the transmission part facing the pressing head. A guide post is arranged on the pressing head corresponding to the guide sleeve. The guide post is inserted and cooperated with the guide sleeve, and the elastic part is simultaneously sleeved on the outer peripheries of the guide post and the guide sleeve.

4. The medical injection pen according to claim 1, wherein, An anti-disengagement hook is arranged on the outer periphery of the end of the pressing head facing the digital cylinder. An anti-disengagement groove is arranged on the digital cylinder corresponding to the anti-disengagement hook. The anti-disengagement hook is in snap-fit with the anti-disengagement groove to limit the displacement of the pressing head on the axis of the installation channel.

5. The medical injection pen according to claim 1, characterized in that, The circumferential limiting member includes a guiding protrusion provided on the outer periphery of the transmission ring and a guiding groove provided on the inner wall of the sliding cylinder. The guiding groove extends along the axis of the sliding cylinder, and the guiding protrusion is in up-and-down sliding fit with the guiding groove.

6. The medical injection pen according to claim 1, wherein, A reading port is formed on the outer periphery of the pen barrel, the reading port is communicated with the installation channel, and a scale is provided on the outer wall of the digital cylinder.

7. The medical injection pen according to claim 1, wherein The transmission assembly further includes a pen cap, the pen cap covers the outer periphery of the injection assembly and is connected to the bottom opening of the liquid injection channel.

8. The medical injection pen according to claim 1, wherein The injection assembly further includes a pen core holder, the cartridge is clamped inside the pen core holder, and the top of the pen core holder is clamped on the inner wall of the liquid injection channel.

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