Insulin pen

Abstract

The application discloses an insulin pen and relates to the technical field of medical devices.The insulin pen comprises an insulin pen body, the insulin pen body comprises a pen barrel, a limiting ring is arranged on the inner side of the bottom of the pen barrel, the bottom end of the pen barrel is connected with the top end of a pen core mounting barrel in a threaded mode, a pen core assembly is arranged in the pen core mounting barrel, and the pen core assembly comprises a pressing column, a pen core pressing assembly, an insulin injection control mechanism, a pressing column one-way displacement control mechanism, a pressing column friction force releasing mechanism and an injection amount control mechanism.The inner side of the limiting ring is vertically and slidably connected with the pressing column.The insulin pen is provided with a required injection amount, and the injection amount does not need to be frequently set every time, the air in the needle is very convenient to discharge after the needle is replaced, the air in the needle can be discharged without separately setting a small insulin discharge amount, the operation is convenient, the pressing safety assembly is arranged, and insulin is prevented from flowing out due to accidental touch or accidental extrusion after the insulin pen is stored.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an insulin pen. Background Technology

[0002] Insulin pens are medical devices used to inject insulin for patients with blood sugar problems. The specific steps for using an insulin pen are as follows: hold the needle tip of the insulin pen vertically or at an angle to the skin at the injection site, insert the needle tip into the patient's body, pause for a few seconds after injection, and then remove the needle tip. Existing insulin pens require setting the injection volume before each injection, and the air inside the needle needs to be expelled after each needle replacement. When expelling air, a small insulin dispensing volume needs to be set, which is cumbersome. In addition, there is a risk of insulin leakage due to accidental touch or squeezing after the insulin pen is stored. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the existing technology and provide an insulin pen that, after setting a required injection volume, does not require frequent setting of the injection volume for each injection. It is also very convenient to expel air from the needle after changing the needle, as it does not require setting a small insulin discharge volume to expel air from the needle. It is easy to operate and is equipped with a press-to-safe component to prevent insulin from leaking out due to accidental touch or squeezing after the insulin pen is stored. It can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an insulin pen, comprising an insulin pen body, the insulin pen body including a pen barrel, a limiting ring, and a cartridge mounting cylinder, wherein a limiting ring is provided on the inner side of the bottom of the pen barrel, and the top end of the cartridge mounting cylinder is threadedly connected to the inner side of the bottom end of the pen barrel, a cartridge assembly is installed inside the cartridge mounting cylinder, and further comprising: The pen refill pressing assembly includes a pressing post and a pressing plate. The pressing post is vertically slidably connected to the inner side of the limiting ring, and the pressing plate is provided at the bottom end of the pressing post. An insulin injection control mechanism includes an injection pressing component and a friction driving component. The injection pressing component is installed inside the pen holder, and the friction driving component is installed on the injection pressing component. The one-way displacement control mechanism of the pressing column is installed on the bottom side of the pen holder; The friction-relieving mechanism for the pressing column is installed on the side of the middle part of the pen holder; The injection volume control mechanism is installed on the top side of the pen holder.

[0005] The pen holder serves as the main body of the insulin pen. The cartridge mounting sleeve holds the cartridge assembly, which contains insulin solution. During injection, the needle assembly is attached to the bottom of the cartridge assembly. The limiting ring is used to install the injection press assembly and the one-way displacement control mechanism of the press column in the insulin injection control mechanism. Before injection, the injection volume control mechanism is used to set the injection volume, which controls the maximum distance the press column can move downwards, thereby controlling the maximum amount of insulin solution squeezed out of the cartridge assembly in a single injection. The needle assembly is inserted subcutaneously into the patient. Then, the injection press assembly and friction drive assembly move the press column downwards along the limiting ring. The press column squeezes the cartridge assembly through the press plate, and the insulin solution inside the cartridge assembly is injected subcutaneously into the patient through the needle assembly. The injection press assembly is then released, and the injection press assembly and friction drive assembly... When the insulin cartridge is reset, the one-way displacement control mechanism prevents the press column from moving upwards relative to the pen barrel during the reset of the injection press assembly and friction drive assembly, thus improving the accuracy of the injection volume. After the insulin solution in one cartridge assembly is used up, the cartridge mounting sleeve is rotated and unscrewed. At this time, the one-way displacement control mechanism no longer restricts the one-way displacement of the press column. Then, the friction release mechanism releases the friction force of the friction drive assembly on the press column, and the press plate pushes the press column upwards relative to the pen barrel. A new cartridge assembly is then replaced in the cartridge mounting sleeve, and the cartridge mounting sleeve is reinstalled at the bottom of the pen barrel. At this time, the one-way displacement control mechanism resumes its one-way displacement restriction effect on the press column, completing the replacement of the cartridge assembly. The entire insulin pen is then restored to its initial usable state.

[0006] Furthermore, the injection pressing assembly includes a slide cylinder, a cap, a connecting post, a pressing cylinder, a return spring, and a rotating ring. The pressing cylinder is vertically slidably installed in the middle of the pen cylinder. The bottom of the pressing cylinder is connected to the top of the limiting ring through the return spring. The top of the limiting ring is connected to the bottom of the rotating ring through two connecting posts. The top of the rotating ring is rotatably connected to the bottom of the slide cylinder. The top of the slide cylinder extends to the outer side of the top of the pen cylinder and is connected to the cap. The cap allows the sliding cylinder to be pressed downwards relative to the pen cartridge. The sliding cylinder, through the rotating ring and connecting post, moves the lower pressure cylinder downwards relative to the pen cartridge. The lower pressure cylinder, through the friction force between the friction drive assembly and the pressing post, moves the pressing post downwards relative to the pen cartridge. At this time, the return spring is compressed by the lower pressure cylinder, and the pressing post moves the pressing plate downwards to squeeze the pen cartridge assembly, causing the insulin solution in the pen cartridge assembly to be discharged through the needle assembly. When the cap is released, the return spring extends and returns to its original position, pushing the lower pressure cylinder, connecting post, rotating ring, sliding cylinder, and cap upwards relative to the pen cartridge to return to their original position. During this process, the friction force between the friction drive assembly and the pressing post is greatly reduced. Only a small friction force needs to be applied to the pressing post by the limiting ring to prevent the pressing post from moving upwards relative to the pen cartridge with the lower pressure cylinder. Therefore, each time the cap is pressed down, the pressing post can be pushed down a certain distance relative to the pen cartridge, thereby discharging insulin solution once through the pen cartridge assembly and the needle assembly.

[0007] Furthermore, the friction drive assembly includes a conical control sleeve, a conical cavity is provided at the top of the lower pressure cylinder, the conical control sleeve is provided in the conical cavity, the bottom of the conical control sleeve is fixedly connected to the top of the straight sleeve, the pressing column passes through the interior of the conical control sleeve and the straight sleeve, three friction grooves are arranged in annular array on the outer periphery of the conical control sleeve, the friction grooves are connected to the interior of the conical control sleeve, a friction ball is provided in each friction groove, a plug ring is threaded to the bottom of the lower pressure cylinder, the bottom outer side of the straight sleeve is slidably connected to the inner side of the plug ring, and a friction spring is sleeved on the outer side of the straight sleeve.

[0008] Furthermore, it also includes a friction sleeve, wherein an annular groove is provided in the middle of the inner side of the limiting ring, and a friction sleeve is installed in the annular groove, and the inner side of the friction sleeve is in frictional contact with the pressing column.

[0009] The friction ball and the pressing post have friction. When the pressing cylinder moves downward relative to the pen barrel, the inner wall of the conical cavity applies additional downward pressure and lateral pressure towards the center of the pressing post to the friction ball, increasing the friction between the friction ball and the pressing post. This friction is greater than the friction between the friction sleeve and the pressing post. The stable friction between the friction ball and the pressing post drives the pressing post downward relative to the pen barrel. When the pressing cylinder moves upward relative to the pen barrel, the inner wall of the conical cavity no longer applies additional downward pressure and lateral pressure towards the center of the pressing post to the friction ball. The friction between the friction ball and the pressing post decreases, becoming less than the friction between the friction sleeve and the pressing post. At this point, the height of the pressing post remains unchanged. Thus, when the pressing cylinder moves downward relative to the pen barrel, it drives the pressing post downward. Due to the elastic force of the return spring, when the pressing cylinder moves upward relative to the pen barrel, the height of the pressing post remains unchanged.

[0010] Furthermore, the one-way displacement control mechanism of the pressing column includes a horizontal slider. The side of the pressing column is provided with a side groove, and the side groove is provided with vertically equidistant helical teeth. The top of the helical teeth is horizontal and the bottom is inclined. The bottom side of the limiting ring is provided with a rectangular horizontal groove corresponding to the side groove. The side of the pen holder is provided with a circular horizontal hole corresponding to the position of the rectangular horizontal groove. A sliding column is slidably connected in the circular horizontal hole, and a screw plug is threaded to the outer end of the circular horizontal hole. A horizontal slider is slidably connected in the rectangular horizontal groove. The end of the horizontal slider near the side groove is provided with a helical tooth. The bottom of the helical tooth is horizontal and the top is inclined. The horizontal slider is connected to the sliding column through a horizontal telescopic rod, and a one-way control spring is sleeved on the outside of the telescopic rod. The two ends of the one-way control spring are respectively connected to the horizontal slider and the sliding column.

[0011] Furthermore, the one-way displacement control mechanism of the pressing column also includes a compression spring, an annular groove, and an annular inclined surface. The bottom of the limiting ring is provided with an annular control groove, which is connected to the bottom of the circular horizontal hole. An annular groove is provided on the outer periphery of the sliding column. The side of the annular groove near the horizontal slider is a guide inclined surface. The top of the pen refill mounting cylinder extends into the annular control groove, and the inner side of the top of the pen refill mounting cylinder is provided with an annular inclined surface that rubs against the guide inclined surface in the annular groove. A compression spring is provided at one end of the circular horizontal hole near the rectangular horizontal groove.

[0012] Because the friction between the friction sleeve and the pressing column is difficult to control, there is a risk of the pressing column moving upward when the lower cylinder moves upward relative to the pen cartridge. If the pressing column moves upward when the lower cylinder moves upward, the next insulin injection volume will be smaller than the target injection volume, which will affect the accuracy of the insulin injection volume. Therefore, a one-way displacement control mechanism for the pressing column is set up. After the pen cartridge installation cylinder is installed, the pressing column can only move downward relative to the pen cartridge, and cannot move upward relative to the pen cartridge. This avoids the pressing column being moved upward relative to the pen cartridge by the friction between the friction ball and the pressing column when the lower cylinder moves upward. Specifically, after the pen refill holder is installed, the annular inclined surface extends into the annular control groove. The annular inclined surface makes frictional contact with the guide inclined surface in the annular groove. Guided by the guide inclined surface in the annular groove, the annular inclined surface allows the sliding column to approach the pressing column in the circular horizontal hole. At this time, the compression spring is compressed. The sliding column, through the telescopic rod and the one-way control spring in its natural state, drives the horizontal slider to extend into the side groove. The second helical tooth on the horizontal slider engages with the first helical tooth in the side groove. Due to the guidance of the inclined surfaces of the second and first helical teeth, the pressing column moves downward relative to the pen refill. At this time, the one-way control spring is compressed, the telescopic rod is shortened, and the first helical tooth can move downward over the second helical tooth. The pressing column can then move smoothly downward relative to the pen refill. When the pressing column moves upward relative to the pen refill, the flat surface on the second helical tooth blocks the flat surface on the first helical tooth, preventing the pressing column from moving downward. Compared to the upward movement of the pen barrel, this design achieves a unidirectional control effect by allowing only the pressing column to move, ensuring the accuracy of insulin injection dosage. When the pen cartridge assembly needs to be replaced, loosening and removing the pen cartridge mounting cylinder allows the annular inclined surface at the top of the mounting cylinder to no longer apply pressure to the sliding column via the guide inclined surface in the annular groove. The compression spring returns to its original position and extends, pushing the sliding column away from the pressing column. The sliding column, through the unidirectional control spring and telescopic rod, drives the horizontal slider away from the pressing column. The second helical tooth disengages from the first helical tooth, and the pressing column is no longer restricted by unidirectional displacement. At this point, the pressing column can be pushed upward relative to the pen barrel to return it to its initial state. A new pen cartridge assembly can also be installed in the pen cartridge mounting cylinder at this time. Loosening the screw plug opens the circular horizontal hole, facilitating the placement of the required components within the circular horizontal hole and rectangular horizontal groove.

[0013] Furthermore, the friction release mechanism of the pressing column includes an arc control plate, a release spring, a connecting rod, and a release pressing sleeve. A side groove is provided on the middle side of the pen holder, and a vertical guide rod is provided in the side groove. A slider is vertically slidably installed in the side groove. The guide hole on the slider is slidably connected to the guide rod. A release spring is sleeved on the bottom of the guide rod. The release pressing sleeve is fixedly connected to the inner side of the slider through the connecting rod. The bottom of the release pressing sleeve is vertically aligned with the top of the conical control sleeve. An arc control plate is installed on the outer side of the slider. When replacing the pen refill assembly, pushing the pressing pin upwards relative to the pen barrel causes friction between the pressing pin and the friction ball to push the friction ball closer to the conical cavity. This increased friction affects the upward movement of the pressing pin relative to the pen barrel. At this point, the pressing pin friction release mechanism needs to be activated. Pressing the arc-shaped control plate in the mechanism with your finger allows it to move downwards relative to the pen barrel. The slider moves downwards along the guide rod, compressing the release spring. The slider, via a connecting rod, releases the pressing pin. As the sleeve moves down, the bottom of the pressing sleeve is released, pressing down on the conical control sleeve. At this time, when the pressing column moves upward relative to the pen barrel, the pressing column pushes the friction ball outward. The friction ball, with the help of the inner wall of the conical cavity, pushes the lower pressure cylinder upward relative to the conical control sleeve. The gap between the conical control sleeve and the inner wall of the conical cavity increases, and the friction between the friction ball and the pressing column decreases. At this time, the pressing column can move upward smoothly relative to the lower pressure cylinder, allowing the pressing column to move upward to the initial position. After the new pen refill assembly is installed, the pressing plate at the bottom of the pressing column better abuts against the top of the pen refill assembly.

[0014] Furthermore, the injection volume control mechanism includes a protrusion. A side groove is provided on the top side of the pen cartridge. A vertical lead screw is rotatably connected within the side groove. A slider is vertically slidably installed within the side groove, and a lead screw nut is fixedly connected to the slider. The lead screw nut and lead screw are connected in cooperation. A protrusion is installed on the inner side of the slider, located below the rotating ring. Rotating the lead screw clockwise causes the screw and nut to move the slider downwards along the side groove, thereby moving the protrusion downwards. When injecting insulin, pressing down on the cartridge cap moves the slider downwards. When the bottom of the rotating ring encounters the top of the protrusion, the slider and cap can no longer move downwards, nor can they move the pressing column downwards, thus stopping the squeezing of the pen cartridge assembly to expel insulin. Therefore, by adjusting the height of the protrusion within the pen cartridge, the amount of insulin injected when squeezing the cartridge and slider is controlled. Since the amount of insulin injected by a patient is generally fixed each time, setting the height of the protrusion is crucial for controlling the insulin injection volume. After each insulin injection, frequent adjustments are unnecessary, avoiding the need to set the injection volume before each injection. Due to the injection volume control mechanism, after each needle assembly replacement, the cap and slide can be slowly pressed again to expel air from the needle assembly until the insulin solution is expelled. Then, the cap and slide are released, and the needle assembly is inserted subcutaneously into the patient. The cap and slide are then pressed firmly again until they can no longer be pressed. At this point, the bottom of the rotating ring encounters the top of the protrusion, allowing the required dosage to be injected through the cartridge and needle assembly.

[0015] Furthermore, the injection volume control mechanism also includes a control groove, a gear, an internal gear ring, and a control operating sleeve. A control groove is formed on the side of the pen cylinder above the second side passage groove. The top of the lead screw extends into the control groove and is fixedly connected to the gear. The control operating sleeve is rotatably fitted onto the outer top of the pen cylinder. The bottom end of the control operating sleeve is fixedly connected to the internal gear ring, which meshes with the gear. The friction protrusion facilitates gripping the control operating sleeve. Rotating the control operating sleeve drives the internal gear ring to rotate, which in turn drives the lead screw to rotate through the transmission between the internal gear ring and the gear. This allows adjustment of the height of the protrusion within the pen cylinder, thus adjusting the injection volume when the cap and slide are pressed down until they cannot be pressed further.

[0016] Furthermore, it also includes a press-to-safety assembly, which comprises a vertical sliding groove, a safety post, and an arc-shaped safety groove. The vertical sliding groove and the arc-shaped safety groove are both located on the inner top side of the pen barrel, with the end of the arc-shaped safety groove communicating with the top of the vertical sliding groove. A safety post is positioned on the outer side of the pen barrel corresponding to the top of the vertical sliding groove. When insulin injection is required, the safety post must be positioned within the vertical sliding groove. In this case, as the pen barrel moves downwards, the safety post moves smoothly down the vertical sliding groove. When insulin injection is not required, rotating the pen barrel clockwise via the cap causes the pen barrel to rotate clockwise relative to the rotating ring, and the safety post enters the arc-shaped safety groove. If the cap is accidentally pressed, the safety post, being within the arc-shaped safety groove, restricts the downward movement of the pen barrel relative to the pen barrel, preventing insulin leakage caused by accidental pressing during storage.

[0017] Compared with existing technologies, the beneficial effects of this insulin pen are: 1. The screw rotates clockwise, and the thread action between the screw and the screw nut causes the slider two to move down along the side groove two, thereby causing the protrusion to move down. When injecting insulin, press down on the cap, causing the slider to move down. When the bottom of the rotating ring encounters the top of the protrusion, the slider and cap can no longer move down, nor can they cause the pressing column to move down, thus stopping the squeezing of the pen cartridge assembly to expel insulin. Therefore, by adjusting the height of the protrusion inside the pen cartridge, the amount of insulin injected when squeezing the cap and slider is controlled. Generally, the amount of insulin injected by a patient is fixed each time. Therefore, once the height of the protrusion is set, i.e., the amount of insulin injected each time is set, frequent operation is not required, avoiding the need to set the injection volume before each injection, making the operation convenient.

[0018] 2. Due to the design of the injection volume control mechanism, after each needle assembly replacement, you can slowly press the cap and slide to expel air from the needle assembly until the insulin solution is expelled. At this point, all air in the needle assembly has been expelled. Then, release the cap and slide, which will return to their original positions due to the return spring. Insert the needle assembly under the patient's skin, and then press the cap and slide firmly again until they can no longer be pressed. At this point, the bottom of the rotating ring will meet the top of the protrusion, allowing the required dosage to be injected through the cartridge assembly and needle assembly. This makes it convenient to expel air from the needle after replacement.

[0019] 3. It does not require frequent setting of injection volume for each injection. It is also very convenient to expel air from the needle after changing the needle. There is no need to set a small insulin discharge volume to expel air from the needle. It is easy to operate and has a press-lock safety component to prevent insulin from leaking out due to accidental touch or squeezing after the insulin pen is stored. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the insulin pen of the present invention; Figure 2 This is a schematic diagram of the rear structure of the insulin pen of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This is a top view of the structure of the insulin pen of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the cross-sectional structure at point B in the middle; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point C in the middle; Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at point D in the middle; Figure 8 For the present invention Figure 5 A magnified schematic diagram of the structure at point E in the middle; Figure 9 For the present invention Figure 4 Schematic diagram of the cross-sectional structure at point F in the middle; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure at point G in the middle; Figure 11 This is a schematic diagram of a partial structure of the insulin pen of the present invention. Figure 1 ; Figure 12 This is a schematic diagram of a partial structure of the insulin pen of the present invention. Figure 2 ; In the diagram: 1. Insulin pen body; 11. Pen barrel; 12. Limiting ring; 13. Pen cartridge mounting cylinder; 14. Observation window; 15. Friction sleeve; 2. Pen cartridge pressing assembly; 21. Pressing post; 22. Vertical guide groove; 23. Guide block; 24. Pressing plate; 3. Insulin injection control mechanism; 31. Slide cylinder; 32. Cylinder cap; 33. Connecting post; 34. Lower pressing cylinder; 35. Slide bar; 36. Slide groove; 37. Conical control sleeve; 38. Straight sleeve; 39. Friction spring; 310. Plug ring; 311. Friction through groove; 312. Friction ball; 313. Return spring; 314. Rotary ring; 315. Pressing post initial position baffle; 4. Pressing post one-way displacement control mechanism; 41. Side groove; 42. Helical tooth one; 43. Rectangular horizontal groove; 44. Horizontal slider; 45. Helical tooth two; 46. Circular horizontal hole; 47. Compression spring; 48. One-way control. Spring, 49 Telescopic rod, 410 Sliding column, 411 Annular groove, 412 Screw plug, 413 Annular inclined surface, 5 Pressing column friction release mechanism, 51 Side through groove one, 52 Guide rod, 53 Slider one, 54 Arc control plate, 55 Release spring, 56 Connecting rod, 57 Release pressing sleeve, 6 Injection volume control mechanism, 61 Side through groove two, 62 Lead screw, 63 Slider two, 64 Lead screw nut, 65 Protrusion, 66 Control groove, 67 Gear, 68 Internal gear ring, 69 Control operation sleeve, 610 Injection volume indicator needle, 7 Press safety assembly, 71 Vertical sliding groove, 72 Safety column, 73 Arc safety sliding groove, 8 Pen refill assembly, 81 Pen refill cartridge, 82 Rubber piston, 83 Hard pressure plate, 84 Dispensing rubber plug, 9 Needle assembly, 91 Disassembly sleeve, 92 Needle. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1, please refer to Figures 1 to 12 This embodiment provides a technical solution: an insulin pen, including an insulin pen body 1. The insulin pen body 1 includes a pen barrel 11, a limiting ring 12, and a pen cartridge mounting cylinder 13. The limiting ring 12 is provided on the inner side of the bottom of the pen barrel 11, and the top end of the pen cartridge mounting cylinder 13 is threadedly connected to the inner side of the bottom end of the pen barrel 11. A pen cartridge assembly 8 is installed inside the pen cartridge mounting cylinder 13.

[0023] The insulin pen body 1 also includes an observation window 14. Two observation windows 14 are opened on both sides of the pen cartridge mounting cylinder 13. The remaining amount of insulin solution in the pen cartridge assembly 8 can be observed through the observation window 14.

[0024] It also includes a pen refill pressing assembly 2, an insulin injection control mechanism 3, a one-way displacement control mechanism for the pressing column 4, a friction release mechanism for the pressing column 5, and an injection volume control mechanism 6.

[0025] The pen refill pressing assembly 2 includes a pressing post 21 and a pressing plate 24. The pressing post 21 is vertically slidably connected to the inner side of the limiting ring 12, and the pressing plate 24 is provided at the bottom end of the pressing post 21. The pen refill pressing assembly 2 also includes a vertical guide groove 22 and a guide block 23. The vertical guide groove 22 is provided on the side of the pressing post 21, and the guide block 23, which is slidably connected to the vertical guide groove 22, is integrally formed on the inner side of the limiting ring 12.

[0026] The pen cartridge assembly 8 includes a cartridge 81, a rubber piston 82, a rigid pressure plate 83, and a dispensing stopper 84. The rubber piston 82 is installed at the top of the cartridge 81, and the rigid pressure plate 83 is located on top of the rubber piston 82. The cartridge 81 is filled with insulin solution. The dispensing stopper 84 is located on the inner bottom of the cartridge 81, and a dispensing hole is provided in the middle of the dispensing stopper 84. The pressing plate 24 presses the rubber piston 82 downward through the rigid pressure plate 83, and the rubber piston 82 discharges the insulin solution in the cartridge 81 through the dispensing hole on the dispensing stopper 84. As long as the rigid pressure plate 83 is not pressed, the insulin solution will not be discharged through the dispensing hole on the dispensing stopper 84.

[0027] It is also provided with a needle assembly 9, which includes a disassembly sleeve 91 and a needle 92. The disassembly sleeve 91 is threaded to the bottom outer side of the pen refill cartridge 81, and the needle 92 is provided at the bottom center of the disassembly sleeve 91.

[0028] The insulin injection control mechanism 3 includes an injection pressing component and a friction drive component. The injection pressing component is installed inside the pen holder 11, and the friction drive component is installed on the injection pressing component. The injection pressing assembly includes a slide cylinder 31, a cap 32, a connecting post 33, a pressing cylinder 34, a return spring 313, and a rotating ring 314. The pressing cylinder 34 is vertically slidably installed in the middle of the pen cylinder 11. The bottom of the pressing cylinder 34 is connected to the top of the limiting ring 12 through the return spring 313. The top of the limiting ring 12 is connected to the bottom of the rotating ring 314 through two connecting posts 33. The top of the rotating ring 314 is rotatably connected to the bottom of the slide cylinder 31. The top of the slide cylinder 31 extends to the outer side of the top of the pen cylinder 11 and is connected to the cap 32. The cap 32 allows the slide cylinder 31 to be pressed downward relative to the pen cartridge 11. The slide cylinder 31, via the rotating ring 314 and connecting post 33, drives the lower pressure cylinder 34 to move downward relative to the pen cartridge 11. The lower pressure cylinder 34, through the friction between the friction drive assembly and the pressing post 21, drives the pressing post 21 to move downward relative to the pen cartridge 11. At this time, the return spring 313 is compressed by the lower pressure cylinder 34. The pressing post 21 drives the pressing disc 24 to press downward against the pen cartridge assembly 8, causing the insulin solution in the pen cartridge assembly 8 to be discharged through the needle assembly 9. Releasing the cap 32 allows the return spring 313 to extend and return to its original position. When the lower cylinder 34, connecting column 33, rotating ring 314, sliding cylinder 31, and cap 32 are pushed upward and reset relative to the pen cartridge 11, the friction force between the friction drive assembly and the pressing column 21 is greatly reduced. Only a small friction force needs to be applied to the pressing column 21 by the limiting ring 12 to prevent the pressing column 21 from moving upward relative to the pen cartridge 11 with the lower cylinder 34. Thus, each time the cap 32 is pressed down, the pressing column 21 can be pushed downward a certain distance relative to the pen cartridge 11, thereby discharging insulin solution once through the pen cartridge assembly 8 and the needle assembly 9.

[0029] The injection pressing assembly also includes a slide bar 35 and a groove 36. The inner side of the pen holder 11 is provided with a groove 36, and the outer side of the pressing cylinder 34 is integrally formed with a slide bar 35. The slide bar 35 and the groove 36 are vertically slidably connected.

[0030] The friction drive assembly includes a conical control sleeve 37, a straight sleeve 38, a friction spring 39, a plug ring 310, a friction groove 311, and a friction ball 312. A conical cavity is provided at the top of the lower pressure cylinder 34. The top diameter of the conical cavity is smaller than the bottom diameter, and the bottom diameter of the conical cavity is equal to the inner diameter of the bottom of the lower pressure cylinder 34. A conical control sleeve 37 is provided inside the conical cavity. The top outer diameter of the conical control sleeve 37 is smaller than the bottom outer diameter. The bottom of the conical control sleeve 37 is fixedly connected to the top of the straight sleeve 38. A pressing column 21 passes through the interior of the conical control sleeve 37 and the straight sleeve 38. The outer diameter of the straight sleeve 38 is smaller than the bottom outer diameter of the conical control sleeve 37, and the inner diameter of the straight sleeve 38 is equal to the inner diameter of the conical control sleeve 37. The inner diameter of the conical control sleeve 37 is such that three friction grooves 311 are arranged in an annular array on the outer periphery of the conical control sleeve 37. The friction grooves 311 are connected to the inside of the conical control sleeve 37. Each friction groove 311 is provided with a friction ball 312. The bottom of the lower pressure cylinder 34 is threadedly connected to a plug ring 310. The bottom outer side of the straight sleeve 38 is slidably connected to the inner side of the plug ring 310. A friction spring 39 is sleeved on the outer side of the straight sleeve 38. The friction spring 39 is in a compressed state. The elastic force of the friction spring 39 pushes the straight sleeve 38 and the conical control sleeve 37 to move upward relative to the lower pressure cylinder 34, so that each friction ball 312 abuts against the inner wall of the conical cavity and the outer side of the pressing column 21 respectively.

[0031] It also includes a pressing post initial position baffle 315. The pressing post initial position baffle 315 is provided inside the slide cylinder 31. When replacing the new pen refill assembly 8, the pressing post 21 is moved upward relative to the pen cylinder 11. It stops when the top of the pressing post 21 touches the lower side of the pressing post initial position baffle 315. At this time, the new pen refill assembly 8 is installed in the pen refill mounting cylinder 13. The pen refill mounting cylinder 13 is reinstalled on the top of the pen refill mounting cylinder 13. At this time, the pressing plate 24 at the bottom of the pressing post 21 touches the upper side of the hard pressing plate 83 at the top of the pen refill assembly 8.

[0032] It also includes a friction rubber sleeve 15, and an annular groove is provided in the middle of the inner side of the limiting ring 12. The friction rubber sleeve 15 is installed in the annular groove, and the inner side of the friction rubber sleeve 15 is in frictional contact with the pressing column 21.

[0033] The friction ball 312 and the pressing post 21 have frictional force. When the pressing cylinder 34 moves downward relative to the pen cylinder 11, the inner wall of the conical cavity applies additional downward pressure and lateral pressure towards the center of the pressing post 21 to the friction ball 312, increasing the frictional force between the friction ball 312 and the pressing post 21. The frictional force between the friction ball 312 and the pressing post 21 is greater than the frictional force between the friction sleeve 15 and the pressing post 21. The stable frictional force between the friction ball 312 and the pressing post 21 drives the pressing post 21 to move downward relative to the pen cylinder 11. When the pressing cylinder 34 moves upward relative to the pen cylinder 11... At this time, the inner wall of the conical cavity no longer applies additional downward pressure to the friction ball 312 and lateral pressure towards the center of the pressing column 21. The friction between the friction ball 312 and the pressing column 21 decreases. The friction between the friction ball 312 and the pressing column 21 is less than the friction between the friction sleeve 15 and the pressing column 21. At this time, the height of the pressing column 21 remains unchanged. Thus, when the lower pressing cylinder 34 moves down relative to the pen cylinder 11, it drives the pressing column 21 to move down. Due to the elastic force of the return spring 313, when the lower pressing cylinder 34 moves up relative to the pen cylinder 11, the height of the pressing column 21 remains unchanged.

[0034] The one-way displacement control mechanism 4 of the pressing column is installed on the bottom side of the pen holder 11; The one-way displacement control mechanism 4 of the pressing column includes a side groove 41, a first helical tooth 42, a rectangular horizontal groove 43, a horizontal slider 44, a second helical tooth 45, a circular horizontal hole 46, a one-way control spring 48, a telescopic rod 49, a sliding column 410, and a screw plug 412. The side of the pressing column 21 has a side groove 41, and the first helical tooth 42 is arranged vertically at equal intervals in the side groove 41. The top of the first helical tooth 42 is horizontal and the bottom is inclined. The bottom side of the limiting ring 12 has a rectangular horizontal groove 43 corresponding to the side groove 41. The side of the pen holder 11 is positioned corresponding to the rectangular horizontal groove 43. A circular transverse hole 46 is provided, and a sliding column 410 is slidably connected inside the circular transverse hole 46. A screw plug 412 is threadedly connected to the outer end of the circular transverse hole 46. A transverse slider 44 is slidably connected inside the rectangular transverse groove 43. A helical tooth 45 is provided at one end of the transverse slider 44 near the side groove 41. The bottom of the helical tooth 45 is horizontal and the top is inclined. The transverse slider 44 is connected to the sliding column 410 through a transverse telescopic rod 49. A one-way control spring 48 is sleeved on the outside of the telescopic rod 49. The two ends of the one-way control spring 48 are respectively connected to the transverse slider 44 and the sliding column 410.

[0035] The one-way displacement control mechanism 4 of the pressing column also includes a compression spring 47, an annular groove 411 and an annular inclined surface 413. The bottom of the limiting ring 12 is provided with an annular control groove, which is connected to the bottom of the circular transverse hole 46. The outer periphery of the sliding column 410 is provided with an annular groove 411. The side of the annular groove 411 near the horizontal slider 44 is a guide inclined surface. The top of the pen refill mounting cylinder 13 extends into the annular control groove, and the inner side of the top of the pen refill mounting cylinder 13 is provided with an annular inclined surface 413 that is in frictional contact with the guide inclined surface in the annular groove 411. A compression spring 47 is provided at one end of the circular transverse hole 46 near the rectangular transverse groove 43.

[0036] Because the friction force between the friction sleeve 15 and the pressing column 21 is difficult to control, there is a risk that the pressing column 21 will shift upward when the lower cylinder 34 moves upward relative to the pen cartridge 11. Once the lower cylinder 34 moves upward and the pressing column 21 shifts upward, the next insulin injection volume will be smaller than the target injection volume, which will affect the accuracy of the insulin injection volume. Therefore, a one-way displacement control mechanism 4 for the pressing column is set up. After the pen cartridge installation cylinder 13 is installed, the pressing column 21 can only move downward relative to the pen cartridge 11, and cannot move upward relative to the pen cartridge 11. This avoids the pressing column 21 from moving upward relative to the pen cartridge 11 due to the friction force between the friction ball 312 and the pressing column 21 when the lower cylinder 34 moves upward. Specifically, after the pen refill mounting cylinder 13 is installed, the annular inclined surface 413 extends into the annular control groove. The annular inclined surface 413 makes frictional contact with the guide inclined surface in the annular groove 411. Guided by the guide inclined surface in the annular groove 411, the annular inclined surface 413 allows the sliding column 410 to approach the pressing column 21 in the circular horizontal hole 46. At this time, the compression spring 47 is compressed. The sliding column 410 drives the horizontal slider 44 to extend into the side groove 41 through the telescopic rod 49 and the one-way control spring 48 in its natural state. The second helical tooth 45 on the 4th groove engages with the first helical tooth 42 in the side groove 41. Guided by the inclined surfaces of the second helical tooth 45 and the first helical tooth 42, the pressing post 21 moves downward relative to the pen cylinder 11. At this time, the one-way control spring 48 is compressed, the telescopic rod 49 shortens, and the first helical tooth 42 can move downward past the second helical tooth 45. Thus, the pressing post 21 can smoothly move downward relative to the pen cylinder 11. When the pressing cylinder 34 moves upward relative to the pen cylinder 11, the flat surface on the second helical tooth 45 blocks the flat surface on the first helical tooth 42, preventing the pressing post 21 from moving downward. The pressure column 21 cannot move upward relative to the pen cartridge 11, achieving a unidirectional control effect of only displacing the pressure column 21, ensuring the accuracy of insulin injection dosage. When the pen cartridge assembly 8 needs to be replaced, the pen cartridge mounting cylinder 13 is loosened and removed. The annular inclined surface 413 at the top of the pen cartridge mounting cylinder 13 no longer applies pressure towards the pressure column 21 to the sliding column 410 with the guide inclined surface inside the annular groove 411. The compression spring 47 returns to its original position and extends, pushing the sliding column 410 away from the pressure column 21. The sliding column 410 moves away from the pressure column 21 through a unidirectional... Control spring 48 and telescopic rod 49 drive horizontal slider 44 away from pressing post 21, helical tooth 25 disengages from helical tooth 1 42, pressing post 21 is no longer restricted by unidirectional displacement, pressing post 21 can be pushed to move upward relative to pen barrel 11, allowing pressing post 21 to return to its initial state. At this time, a new pen refill assembly 8 can also be installed in pen refill mounting cylinder 13. Loosening screw plug 412 can open circular horizontal hole 46, making it convenient to arrange the required components in circular horizontal hole 46 and rectangular horizontal groove 43.

[0037] The friction release mechanism 5 for the pressing column is installed on the middle side of the pen holder 11; The injection volume control mechanism 6 is installed on the top side of the pen holder 11.

[0038] The injection volume control mechanism 6 includes a second side channel 61, a lead screw 62, a second slider 63, a lead screw nut 64, and a protrusion 65. The second side channel 61 is provided on the top side of the pen holder 11. The second vertical lead screw 62 is rotatably connected to the second side channel 61 through a bearing. The second slider 63 is vertically slidably installed in the second side channel 61. The second lead screw nut 64 is fixedly connected to the second slider 63. The lead screw nut 64 is connected to the lead screw 62. The second protrusion 65 is installed on the inner side of the second slider 63. The protrusion 65 is located below the rotating ring 314. The screw 62 rotates clockwise, and the threaded action between the screw 62 and the screw nut 64 causes the slider 63 to move downwards along the side groove 61, thereby causing the protrusion 65 to move downwards. When injecting insulin, pressing down on the cap 32 causes the slide cylinder 31 to move downwards. When the bottom of the rotating ring 314 encounters the top of the protrusion 65, the slide cylinder 31 and the cap 32 can no longer move downwards, nor can they cause the pressing column 21 to move downwards, thus stopping the squeezing of the pen cartridge assembly 8 to expel insulin. Therefore, by adjusting the height of the protrusion 65 inside the pen cartridge 11, the amount of insulin injected when squeezing the cap 32 and the slide cylinder 31 is controlled. Generally, the amount of insulin injected by a patient each time is fixed, so setting the protrusion 65 is crucial. The height, meaning that once the insulin injection volume is set, frequent operation is not required, avoiding the need to set the injection volume before each injection. Due to the setting of the injection volume control mechanism 6, after each replacement of the needle assembly 9, the cap 32 and slide 31 can be slowly pressed again to expel the air inside the needle assembly 9 until the insulin solution is expelled from the needle assembly 9. Then, the cap 32 and slide 31 are released, the needle assembly 9 is inserted under the patient's skin, and the cap 32 and slide 31 are pressed again until they can no longer be pressed. At this time, the bottom of the rotating ring 314 meets the top of the protrusion 65, and the required amount of medication can be injected through the pen cartridge assembly 8 and the needle assembly 9.

[0039] The injection volume control mechanism 6 also includes an injection volume indicator needle 610. A horizontal injection volume indicator needle 610 is provided on the outer side of the slider 2 63. A scale is vertically provided on the outer side of the pen holder 11 at one side of the side passage groove 2 61. The injection volume indicator needle 610, together with the scale, can indicate the height of the protrusion 65 in the pen holder 11, as well as the distance between the top of the protrusion 65 and the bottom of the rotating ring 314. It can also indicate the maximum amount of medicine that can be injected.

[0040] The injection volume control mechanism 6 also includes a control groove 66, a gear 67, an internal gear ring 68, and a control operation sleeve 69. The control groove 66 is located on the side of the pen holder 11 above the side passage groove 61. The top of the lead screw 62 extends into the control groove 66 and is fixedly connected to the gear 67. The control operation sleeve 69 is rotatably fitted onto the outer top of the pen holder 11. The bottom end of the control operation sleeve 69 is fixedly connected to the internal gear ring 68, which meshes with the gear 67. Friction protrusions are arranged in a circular array on the outer side of the control operation sleeve 69. The friction protrusions facilitate squeezing the control operation sleeve 69. Rotating the control operation sleeve 69 drives the internal gear ring 68 to rotate, which in turn drives the lead screw 62 to rotate via the transmission between the internal gear ring 68 and the gear 67. This allows adjustment of the height of the protrusion 65 within the pen holder 11, thus adjusting the injection volume when the cap 32 and the slide 31 are pressed down until they cannot be pressed further.

[0041] In use, the pen holder 11 serves as the main body of the insulin pen body 1. The pen cartridge installation cylinder 13 is used to hold and install the pen cartridge assembly 8, which contains insulin solution. During injection, the needle assembly 9 is installed at the bottom of the pen cartridge assembly 8. The limiting ring 12 is used to install the injection pressing component and the one-way displacement control mechanism 4 of the pressing column in the insulin injection control mechanism 3. Before injection, the injection volume is set by the injection volume control mechanism 6, which controls the maximum distance that the insulin injection control mechanism 3 can drive the pressing column 21 downward, thereby controlling the maximum amount of insulin solution squeezed out of the pen cartridge assembly 8 in a single injection. The needle assembly 9 is inserted into the patient's subcutaneous tissue. Then, the injection pressing component and the friction drive component drive the pressing column 21 downward along the limiting ring 12. The pressing column 21 squeezes the pen cartridge assembly 8 through the pressing plate 24, and the insulin solution in the pen cartridge assembly 8 is injected into the patient's subcutaneous tissue through the needle assembly 9. The injection pressing component is released, and the injection pressing component and the friction drive component... When the components are reset, due to the presence of the one-way displacement control mechanism 4, the pressing column 21 will not move upward relative to the pen barrel 11 when the injection pressing component and friction drive component are reset, which helps to improve the accuracy of injection volume. When the insulin solution in one pen cartridge component 8 is used up, the pen cartridge mounting cylinder 13 is rotated and unscrewed. At this time, the one-way displacement control mechanism 4 no longer restricts the one-way displacement of the pressing column 21. Then, the friction force release mechanism 5 releases the friction force of the friction drive component on the pressing column 21. The pressing plate 24 pushes the pressing column 21 upward relative to the pen barrel 11. Then, a new pen cartridge component 8 is replaced in the pen cartridge mounting cylinder 13. The pen cartridge mounting cylinder 13 is reinstalled at the bottom of the pen barrel 11. At this time, the one-way displacement control mechanism 4 resumes to restrict the one-way displacement of the pressing column 21, completing the replacement of the pen cartridge component 8. The entire insulin pen is restored to its initial usable state.

[0042] Example 2, please refer to Figures 1 to 12This embodiment provides a technical solution: an insulin pen. This embodiment is a further explanation of the structure of Embodiment 1. The friction release mechanism 5 for the pressing column includes a side through groove 51, a guide rod 52, a slider 53, an arc control plate 54, a release spring 55, a connecting rod 56, and a release pressing sleeve 57. The side through groove 51 is provided on the middle side of the pen holder 11. A vertical guide rod 52 is provided in the side through groove 51. A slider 53 is vertically slidably installed in the side through groove 51. The guide hole on the slider 53 is slidably connected to the guide rod 52. A release spring 55 is sleeved on the bottom of the guide rod 52. The release pressing sleeve 57 is fixedly connected to the inner side of the slider 53 through the connecting rod 56. The bottom of the release pressing sleeve 57 is vertically aligned with the top of the conical control sleeve 37. An arc control plate 54 is installed on the outer side of the slider 53. The outer side of the arc control plate 54 is provided with friction patterns and an indicator arrow. The indicator arrow is a downward arrow.

[0043] When a new pen refill assembly 8 is replaced, the pressing post 21 is pushed upward relative to the pen barrel 11. At this time, the friction between the pressing post 21 and the friction ball 312 pushes the friction ball 312 closer to the conical cavity. The increased friction between the pressing post 21 and the friction ball 312 affects the upward movement of the pressing post 21 relative to the pen barrel 11. At this time, it is necessary to operate the pressing post friction release mechanism 5. Press the arc control plate 54 in the pressing post friction release mechanism 5 with your finger. With the help of your finger and the arc control plate 54, the arc control plate 54 is moved downward relative to the pen barrel 11. The slider 1 53 moves downward along the guide rod 52, the release spring 55 is compressed, and the slider 1 53 is driven to release the pressing post through the connecting rod 56. As the pressure sleeve 57 moves downward, the bottom end of the pressure sleeve 57 is released from pressing down on the conical control sleeve 37. At this time, when the pressing column 21 moves upward relative to the pen holder 11, the pressing column 21 pushes the friction ball 312 outward. The friction ball 312 pushes the lower pressure cylinder 34 upward relative to the conical control sleeve 37 with the help of the inner wall of the conical cavity. The gap between the conical control sleeve 37 and the inner wall of the conical cavity increases, and the friction between the friction ball 312 and the pressing column 21 decreases. At this time, the pressing column 21 can move upward smoothly relative to the lower pressure cylinder 34, allowing the pressing column 21 to move upward to the initial position. After the new pen refill assembly 8 is installed, the pressing plate 24 at the bottom of the pressing column 21 better abuts against the top of the pen refill assembly 8.

[0044] Example 3, please refer to Figures 1 to 12 This embodiment provides a technical solution: an insulin pen. The structure of this embodiment is roughly the same as that of Embodiment 2, except that; It also includes a press-to-safety assembly 7, which includes a vertical sliding groove 71, a safety post 72, and an arc-shaped safety groove 73. The pen holder 11 has a vertical sliding groove 71 on its top inner side and an arc-shaped safety groove 73 on its top inner side. The end of the arc-shaped safety groove 73 is connected to the top of the vertical sliding groove 71. The safety post 72 is provided on the outer side of the slide cylinder 31 at the position corresponding to the top of the vertical sliding groove 71. When insulin injection is needed, ensure that the safety post 72 is located within the vertical sliding groove 71. When the slide cylinder 31 moves down, the safety post 72 moves smoothly down along the vertical sliding groove 71. When insulin injection is not needed, rotate the slide cylinder 31 clockwise via the cap 32. The slide cylinder 31 rotates clockwise relative to the rotating ring 314, and the safety post 72 enters the arc-shaped safety groove 73. If the cap 32 is accidentally pressed, the safety post 72 is in the arc-shaped safety groove 73, which restricts the slide cylinder 31 from moving down relative to the pen holder 11, thus preventing insulin leakage caused by accidental pressing when storing the insulin pen.

[0045] Please see Figures 1 to 12 The method of using an insulin pen includes the following steps: The needle assembly 9 is installed at the bottom of the pen cartridge assembly 8. Rotating the control operating sleeve 69 drives the internal gear ring 68 to rotate. Through the transmission of the internal gear ring 68 and the gear 67, the lead screw 62 rotates clockwise. The thread action of the lead screw 62 and the lead screw nut 64 drives the slider 63 to move down along the side through groove 61, thereby driving the protrusion 65 to move down and press down on the cap 32, driving the slide cylinder 31 to move down. When the bottom of the rotating ring 314 meets the top of the protrusion 65, the slide cylinder 31 and the cap 32 can no longer move down, nor can they drive the pressing column 21 to move down. That is, the squeezing of the pen cartridge assembly 8 to expel insulin solution stops. Thus, by adjusting the height of the protrusion 65 in the pen cartridge 11, the amount of insulin solution injected when squeezing the cap 32 and the slide cylinder 31 is controlled. Hold the upper part of the pen holder 11 with the needle assembly 9 facing upwards. Slowly press the cap 32 and the slide 31 with your thumb to expel the air from the needle assembly 9 until the insulin solution is expelled from the needle assembly 9. At this point, the air in the needle assembly 9 will be completely expelled. Then release the cap 32 and the slide 31. The cap 32 and the slide 31 will return to their original positions due to the return spring 313. Rotate the cylinder cover 32 and the slide cylinder 31 counterclockwise to allow the safety pin 72 to enter the vertical slide groove 71 along the arc safety slide groove 73, and use the cylinder cover 32 to prevent accidental activation. Insert the needle assembly 9 under the patient's skin, then press the cap 32 and the slide 31 again to move the lower cylinder 34 down relative to the pen cylinder 11. The inner wall of the conical cavity applies additional downward pressure and lateral pressure towards the center of the pressing column 21 to the friction ball 312, increasing the friction between the friction ball 312 and the pressing column 21. The friction between the friction ball 312 and the pressing column 21 steadily moves the pressing column 21 down relative to the pen cylinder 11. Stop when the bottom of the rotating ring 314 encounters the top of the protrusion 65. The required amount of medicine can then be injected through the pen core assembly 8 and the needle assembly 9. When the cap 32 is released, the injection pressing assembly and the friction drive assembly are reset. Due to the presence of the one-way displacement control mechanism 4 of the pressing column, the pressing column 21 will not move upward relative to the pen holder 11 when the injection pressing assembly and the friction drive assembly are reset. After the insulin solution in the pen cartridge assembly 8 is used up, loosen the pen cartridge mounting cylinder 13. The annular inclined surface 413 at the top of the pen cartridge mounting cylinder 13 no longer applies pressure to the sliding column 410 towards the pressing column 21 with the help of the guiding inclined surface in the annular groove 411. The compression spring 47 returns to its original position and extends, pushing the sliding column 410 away from the pressing column 21. The sliding column 410 drives the horizontal slider 44 away from the pressing column 21 through the one-way control spring 48 and the telescopic rod 49. The helical tooth 2 45 disengages from the helical tooth 1 42, and the pressing column 21 is no longer restricted by one-way displacement. Press your finger on the arc control plate 54 in the mechanism 5 for releasing the friction of the pressing column. With the help of your finger and the arc control plate 54, the arc control plate 54 moves down relative to the pen holder 11. The slider 53 moves down along the guide rod 52, the release spring 55 is compressed, and the slider 53 drives the release pressing sleeve 57 to move down through the connecting rod 56. The bottom end of the release pressing sleeve 57 presses down on the conical control sleeve 37. The pressing plate 24 pushes the pressing column 21 upward relative to the pen holder 11, and the pressing column 21 pushes the friction ball 312 outward. The friction ball 312 pushes the lower pressing cylinder 34 upward relative to the conical control sleeve 37 by the inner wall of the conical cavity. The gap between the conical control sleeve 37 and the inner wall of the conical cavity increases, and the friction between the friction ball 312 and the pressing column 21 decreases. At this time, the pressing column 21 moves upward smoothly relative to the lower pressing cylinder 34, so that the top of the pressing column 21 abuts against the initial position baffle 315 of the pressing column and reaches the initial position. The new pen refill assembly 8 is installed in the pen refill installation cylinder 13. Then the top of the pen refill installation cylinder 13 is re-threaded and installed on the bottom of the pen holder 11. At this time, the pressing plate 24 abuts against the middle of the top of the pen refill assembly 8, and the replacement of the pen refill assembly 8 is completed.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An insulin pen, comprising an insulin pen body (1), the insulin pen body (1) including a pen barrel (11), a limiting ring (12) and a cartridge mounting cylinder (13), wherein the limiting ring (12) is provided on the inner side of the bottom of the pen barrel (11), and the top end of the cartridge mounting cylinder (13) is threadedly connected to the inner side of the bottom end of the pen barrel (11), and a cartridge assembly (8) is installed inside the cartridge mounting cylinder (13), characterized in that, Also includes: The pen refill pressing assembly (2) includes a pressing post (21) and a pressing plate (24). The pressing post (21) is vertically slidably connected to the inner side of the limiting ring (12), and the pressing plate (24) is provided at the bottom end of the pressing post (21). The insulin injection control mechanism (3) includes an injection pressing component and a friction drive component. The injection pressing component is installed inside the pen holder (11), and the friction drive component is installed on the injection pressing component. The one-way displacement control mechanism (4) of the pressing column is installed on the bottom side of the pen holder (11); The friction release mechanism (5) for pressing the column is installed on the middle side of the pen holder (11); The injection volume control mechanism (6) is installed on the top side of the pen holder (11).

2. The insulin pen according to claim 1, characterized in that: The injection pressing assembly includes a slide cylinder (31), a cap (32), a connecting post (33), a pressing cylinder (34), a return spring (313), and a rotating ring (314). The pressing cylinder (34) is vertically slidably installed in the middle of the pen holder (11). The bottom of the pressing cylinder (34) is connected to the top of the limiting ring (12) through the return spring (313). The top of the limiting ring (12) is connected to the bottom of the rotating ring (314) through two connecting posts (33). The top of the rotating ring (314) is rotatably connected to the bottom of the slide cylinder (31). The top of the slide cylinder (31) extends to the outside of the top of the pen holder (11) and is connected to the cap (32).

3. The insulin pen according to claim 2, characterized in that: The friction drive assembly includes a conical control sleeve (37), and a conical cavity is provided at the top of the lower cylinder (34). The conical control sleeve (37) is provided in the conical cavity. The bottom of the conical control sleeve (37) is fixedly connected to the top of the straight sleeve (38). The pressing column (21) passes through the interior of the conical control sleeve (37) and the straight sleeve (38). The outer periphery of the conical control sleeve (37) is provided with three friction through grooves (311) in an annular array. The friction through grooves (311) are connected to the interior of the conical control sleeve (37). Each friction through groove (311) is provided with a friction ball (312). The bottom of the lower cylinder (34) is threadedly connected to a plug ring (310). The bottom outer side of the straight sleeve (38) is slidably connected to the inner side of the plug ring (310). A friction spring (39) is sleeved on the outer side of the straight sleeve (38).

4. The insulin pen according to claim 3, characterized in that: It also includes a friction rubber sleeve (15), and an annular groove is provided in the middle of the inner side of the limiting ring (12). The friction rubber sleeve (15) is installed in the annular groove, and the inner side of the friction rubber sleeve (15) is in frictional contact with the pressing column (21).

5. The insulin pen according to claim 3, characterized in that: The one-way displacement control mechanism (4) of the pressing column includes a horizontal slider (44). The side of the pressing column (21) is provided with a side groove (41). The side groove (41) is provided with vertically equidistant helical teeth (42). The top of the helical teeth (42) is horizontal and the bottom is inclined. The bottom side of the limiting ring (12) is provided with a rectangular horizontal groove (43) corresponding to the side groove (41). The side of the pen holder (11) is provided with a circular horizontal hole (46) corresponding to the rectangular horizontal groove (43). A sliding column (410) is slidably connected in the circular horizontal hole (46). The outer end of the circular transverse hole (46) is threaded with a screw plug (412), and a transverse slider (44) is slidably connected in the rectangular transverse groove (43). The transverse slider (44) is provided with a helical tooth (45) at one end near the side groove (41). The bottom of the helical tooth (45) is horizontal and the top is inclined. The transverse slider (44) is connected to the slide column (410) through the transverse telescopic rod (49), and a one-way control spring (48) is sleeved on the outside of the telescopic rod (49). The two ends of the one-way control spring (48) are respectively connected to the transverse slider (44) and the slide column (410).

6. The insulin pen according to claim 5, characterized in that: The one-way displacement control mechanism (4) of the pressing column also includes a compression spring (47), an annular groove (411) and an annular inclined surface (413). The bottom of the limiting ring (12) is provided with an annular control groove, which is connected to the bottom of the circular horizontal hole (46). The outer periphery of the sliding column (410) is provided with an annular groove (411). The side of the annular groove (411) near the horizontal slider (44) is a guide inclined surface. The top of the pen refill mounting cylinder (13) extends into the annular control groove, and the inner side of the top of the pen refill mounting cylinder (13) is provided with an annular inclined surface (413) that rubs against the guide inclined surface in the annular groove (411). A compression spring (47) is provided at one end of the circular horizontal hole (46) near the rectangular horizontal groove (43).

7. The insulin pen according to claim 3, characterized in that: The friction release mechanism (5) of the pressing column includes an arc control plate (54), a release spring (55), a connecting rod (56) and a release pressing sleeve (57). A side groove (51) is provided on the middle side of the pen holder (11). A vertical guide rod (52) is provided in the side groove (51). A slider (53) is vertically slidably installed in the side groove (51). The guide hole on the slider (53) is slidably connected to the guide rod (52). The bottom of the guide rod (52) is sleeved with a release spring (55). The inner side of the slider (53) is fixedly connected to the release pressing sleeve (57) through the connecting rod (56). The bottom of the release pressing sleeve (57) is vertically and vertically aligned with the top of the conical control sleeve (37). An arc control plate (54) is installed on the outer side of the slider (53).

8. The insulin pen according to claim 2, characterized in that: The injection volume control mechanism (6) includes a protrusion (65). The top side of the pen holder (11) is provided with a side through groove (61). A vertical lead screw (62) is rotatably connected in the side through groove (61). A slider (63) is vertically slidably installed in the side through groove (61). A lead screw nut (64) is fixedly connected to the slider (63). The lead screw nut (64) is connected to the lead screw (62). A protrusion (65) is installed on the inner side of the slider (63). The protrusion (65) is located below the rotating ring (314).

9. The insulin pen according to claim 8, characterized in that: The injection volume control mechanism (6) also includes a control groove (66), a gear (67), an internal gear ring (68), and a control operation sleeve (69). The control groove (66) is provided on the side of the pen holder (11) above the side through groove (61). The top end of the lead screw (62) extends into the control groove (66) and is fixedly connected to the gear (67). The control operation sleeve (69) is rotatably sleeved on the top outer side of the pen holder (11). The bottom end of the control operation sleeve (69) is fixedly connected to the internal gear ring (68), and the internal gear ring (68) meshes with the gear (67).

10. The insulin pen according to claim 2, characterized in that: It also includes a press-lock safety assembly (7), which includes a vertical sliding groove (71), a safety post (72) and an arc-shaped safety groove (73). The pen holder (11) has a vertical sliding groove (71) on the inner side of its top and an arc-shaped safety groove (73) on the inner side of its top. The end of the arc-shaped safety groove (73) is connected to the top of the vertical sliding groove (71). The outer side of the slide cylinder (31) is provided with a safety post (72) at the position corresponding to the top of the vertical sliding groove (71).

Images