A precision automatic injection device with adjustable injection dosage

Abstract

The present invention discloses a precision automatic injection device with adjustable injection dose, comprising an upper pen body shell and a dose adjustment assembly, the dose adjustment assembly including an adjustment knob, a graduated cylinder, and an energy storage component. The adjustment knob is rotatably mounted on the upper end of the upper pen body shell, an intermittent thread is provided on the inner circumference of the upper pen body shell, and a spiral groove is provided on the outer circumference of the graduated cylinder. The adjustment knob is transmission-connected to the energy storage component disposed within the graduated cylinder. Rotating the adjustment knob adjusts the energy stored in the energy storage component for injection through the graduations of the graduated cylinder displayed in a window. The precision automatic injection device with adjustable injection dose according to the present invention comprises an upper pen body shell with a graduated cylinder linked to the energy storage component, a window is provided on the upper pen body shell, and rotating the adjustment knob adjusts the energy stored in the energy storage component for injection through the graduations of the graduated cylinder displayed in the window. The device can accurately adjust the injection dose and set different injection doses according to different needs.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a precise automatic injection device with adjustable injection dosage. Background Art

[0002] Pens, also known as pen-type injection delivery devices, combine medication and injection device into one, offering core advantages such as autonomous medical care, safety, convenience, and avoiding the risk of accidentally breaking a glass syringe during injection. These pens precisely meet the needs of patients with long-term medications, such as those seeking treatment for diabetes and those seeking weight loss. Their outstanding cost-effectiveness and convenience have led to their widespread use in a variety of fields, including insulin, weight loss, biologics, and medical aesthetics.

[0003] With the development of injection pen technology, the current requirements for injection pens include the ability to inject multiple small doses; easy adjustment of the single injection dose; visual inspection of the scale when adjusting the dose; simple operation during injection, and the injection pen will also make a sound during the injection process to indicate that the injection process is in progress.

[0004] Injection pens generally use cartridges to pre-fill the drug solution. When using, the patient assembles the cartridge onto the injection pen and then operates the injection pen to perform the injection.

[0005] Patent document CN103249441B discloses an injection device comprising a housing for a syringe or cartridge containing a drug; a rotating drive shaft for rotating an adjustable predetermined amount to cause a corresponding amount of drug to be expelled from the syringe or cartridge; and a torsion drive spring fixed relative to the drive shaft at one end region and fixed to a joint at its other end region, the joint being adapted to non-rotatably engage a base on the housing. In this technical solution, when adjusting the predetermined injection dose, there is no display device for adjusting the dose, and the patient cannot adjust the injection dose as needed.

[0006] Therefore, it is necessary to propose a precise automatic injection device with adjustable injection dosage to solve the problems existing in the prior art. Summary of the Invention

[0007] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] In order to solve the above problems, the present invention provides a precision automatic injection device with adjustable injection dose, an upper pen body upper shell and a dose adjustment assembly arranged on the upper pen body upper shell, the dose adjustment assembly including an adjustment knob, a scale cylinder and an energy storage component, the adjustment knob is rotatably arranged on the upper end of the upper pen body upper shell, an intermittent thread is provided on the inner circumferential surface of the upper pen body upper shell, a spiral groove is provided on the outer circumference of the scale cylinder, the intermittent thread is threadedly connected to the groove, a window is provided on the circumferential surface of the upper pen body upper shell, the adjustment knob is transmission-connected to the energy storage component arranged in the scale cylinder, and the energy stored in the energy storage component for injection is adjusted by rotating the adjustment knob through the scale of the scale cylinder displayed in the window.

[0009] Preferably, it further comprises a lower shell of the upper pen body, and the lower shell of the upper pen body is snap-connected with the upper shell of the upper pen body.

[0010] Preferably, the energy storage component includes a sleeve, a power rod, a clutch and a torsion spring. The sleeve is arranged inside the scale cylinder, and the sleeve is axially slidingly connected to the scale cylinder. The power rod is arranged inside the sleeve and fixedly connected to the sleeve. The clutch is fixedly arranged in the adjusting knob, and the clutch is clamped with the sleeve. The torsion spring is sleeved on the power rod, and the upper end of the torsion spring extends into the interior of the sleeve and is fixedly connected to the upper end of the sleeve. The lower end of the torsion spring is fixedly connected to the lower shell of the upper pen body. The injection dose is set by rotating the adjusting knob. The adjusting knob tightens the torsion spring through the power rod and the sleeve, so that the torsion spring stores energy that can complete the injection of the corresponding injection dose when released.

[0011] Preferably, a first elastic arm is provided on the lower end surface of the clutch, a second elastic arm is provided on the circumferential surface of the clutch, the sleeve is provided in the scale cylinder, and radially arranged bevel teeth are provided on one end surface of the sleeve, the bevel teeth are engaged with the first elastic arm, an open gear ring is provided at the upper opening of the upper pen body, and the second elastic arm is engaged with the open gear ring.

[0012] Preferably, it also includes a driving assembly, which includes a push rod, a driving nut and a stop block. The stop block is fixedly arranged in the lower shell of the upper pen body, and the driving nut is rotatably arranged on the upper part of the stop block in the lower shell of the upper pen body. The push rod is threadedly connected to the driving nut, and the stop block limits the rotation of the push rod along the axis. The tail end of the push rod extends into the power rod, and teeth arranged in an array along the circumferential direction are arranged on the circumferential surface of the lower end of the power rod. A gear ring is fixedly arranged on the end face of the driving nut close to the upper shell of the upper pen body, and the teeth are engaged with the gear ring.

[0013] Preferably, the upper end of the power rod passes through the clutch and the adjusting knob and extends to the upper part of the adjusting knob, the release button is rotatably set at the upper end of the power rod, the release button is located at the upper part of the adjusting knob, and the return spring is set inside the release button, one end of the return spring is connected to the bottom surface of the release button, and the other end of the return spring is connected to the top of the adjusting knob.

[0014] Preferably, longitudinal teeth evenly arranged along the circumferential direction are provided on the outer circumference of the upper end of the power rod, and longitudinal tooth grooves are provided on the inner circumference of the adjustment knob at positions corresponding to the longitudinal teeth, and the longitudinal teeth are slidably connected to the longitudinal tooth grooves.

[0015] Preferably, the pen further comprises a push rod return mechanism, the push rod return mechanism comprising a permanent magnet disposed in a drive nut and an electromagnetic return assembly clamped on the outer circumference of the lower shell of the upper pen body, at least four magnet slots are provided on the outer circumferential surface of the drive nut along the circumferential direction, and a permanent magnet is fixed in each magnet slot;

[0016] The electromagnetic return assembly includes a ring-shaped shell and a coil winding arranged in the shell. The shell is arranged at a position corresponding to the drive nut outside the lower shell of the upper pen body. The coil winding is fixed in the shell and is electrically connected to the processor.

[0017] Preferably, a pressure sensor is fixedly provided at the front end of the push rod, and the pressure sensor is used to detect the pressure value when the front end of the push rod contacts the end surface of the rubber piston of the cartridge bottle;

[0018] The pressure sensor is electrically connected to a processor. The processor has a preset pressure threshold range. When the pressure value is within the preset pressure threshold range, the cartridge is determined to be correctly installed. When the pressure value is less than the preset pressure threshold range, the processor connects power to the coil winding, causing the drive nut to rotate, causing the drive nut to drive the push rod to move toward the cartridge. When the pressure value reaches the pressure threshold range, the processor disconnects power to the coil winding. When the pressure value is greater than the preset pressure threshold range, the processor connects power to the coil winding, causing the drive nut to rotate in the opposite direction, causing the drive nut to drive the push rod to move away from the cartridge. When the pressure value reaches the pressure threshold range, the processor disconnects power to the coil winding.

[0019] Preferably, a tail wing is provided at the upper end of the push rod, the upper part of the tail wing is in the shape of a barb, an annular protrusion along the circumferential direction is provided on the inner circumference of the power rod near the lower end, and the upper part of the tail wing is engaged with the annular protrusion.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] The precision automatic injection device with adjustable injection dose described in the present invention has a graduated cylinder linked to an energy storage component disposed within the upper shell of the upper pen body. A window is provided on the upper shell of the upper pen body. By rotating the adjustment knob, the energy stored in the energy storage component for injection is adjusted according to the scale of the graduated cylinder displayed in the window. The injection dose can be accurately adjusted and different injection doses can be set according to different needs.

[0022] The other advantages, objectives and features of the precision automatic injection device with adjustable injection dosage described in the present invention will be partially reflected in the following description and will also be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic structural diagram of the precise automatic injection device with adjustable injection dosage and equipped with a needle disclosed in the present invention;

[0025] Figure 2 It is a schematic cross-sectional structural diagram of the precise automatic injection device with adjustable injection dosage disclosed in the present invention;

[0026] Figure 3 This is a schematic structural diagram of the precise automatic injection device with adjustable injection dose disclosed in the present invention, which does not include an adjustment knob, an upper pen body shell, and a release button;

[0027] Figure 4 This is a schematic structural diagram of the upper pen body shell and the graduated cylinder disclosed in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the sleeve and clutch disclosed in the present invention;

[0029] Figure 6 This is a schematic structural diagram of the clutch disclosed in the present invention installed on the upper shell of the pen body;

[0030] Figure 7 It is a structural schematic diagram of the adjustment knob and power rod disclosed in the present invention;

[0031] Figure 8 It is a structural schematic diagram of the push rod and the anti-rotation block disclosed in the present invention;

[0032] Figure 9 It is a structural schematic diagram of the drive nut disclosed in the present invention;

[0033] Figure 10 This is a schematic diagram of the structure of the installation of the graduated cylinder and the upper pen body and lower shell disclosed in the present invention;

[0034] Figure 11 It is a structural schematic diagram of the push rod and power rod and the locking position disclosed in the present invention;

[0035] Figure 12 This is a structural schematic diagram of the push rod return mechanism disclosed in the present invention.

[0036] in:

[0037] 1. Sleeve, 1-1, helical teeth;

[0038] 2. Power rod, 2-1, longitudinal teeth, 2-2, teeth, 2-4, annular protrusion;

[0039] 3. Adjustment knob, 3-1, longitudinal tooth groove;

[0040] 4. Return spring;

[0041] 5. Release the button;

[0042] 6. Clutch, 6-1. First elastic arm, 6-2. Second elastic arm;

[0043] 7. Upper pen housing, 7-1, open gear ring, 7-2, intermittent thread, 7-3, window;

[0044] 8. Scale cylinder, 8-1. Groove, 8-2. Buckle;

[0045] 9. Torsion spring;

[0046] 10. Drive nut, 10-1. Internal thread, 10-2. Ring gear, 10-3. Magnet slot;

[0047] 11. Anti-rotation block, 11-1. Limiting plane;

[0048] 12. Upper pen body and lower shell, 12-1. Card block;

[0049] 13. Pen cap;

[0050] 14. Pen refill holder;

[0051] 16. Push rod, 16-1. Thread, 16-2. Limiting surface, 16-3. Tail wing;

[0052] 17. Needle tip;

[0053] 18. Shell. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0055] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0056] like Figure 1-8As shown, the present invention provides a precision automatic injection device with adjustable injection dose, including an upper pen body shell 7 and a dose adjustment component disposed on the upper pen body shell 7, the dose adjustment component including an adjustment knob 3, a scale cylinder 8 and an energy storage component, the adjustment knob 3 being rotatably disposed on the upper end of the upper pen body shell 7, an intermittent thread 7-2 being disposed on the inner circumferential surface of the upper pen body shell 7, a spiral groove 8-1 being disposed on the outer circumference of the scale cylinder 8, the intermittent thread 7-2 being threadably connected to the groove 8-1, a viewing window 7-3 being disposed on the circumferential surface of the upper pen body shell 7, the adjustment knob 3 being transmission-connected to the energy storage component disposed in the scale cylinder 8, and the energy stored in the energy storage component for injection being adjusted by rotating the adjustment knob 3 through the scale of the scale cylinder 8 displayed in the window 7-3.

[0057] The upper pen body lower shell 12 is further included, and the upper pen body lower shell 12 is snap-connected with the upper pen body upper shell 7 .

[0058] The energy storage component includes a sleeve 1, a power rod 2, a clutch 6 and a torsion spring 9. The sleeve 1 is arranged inside the scale cylinder 8, and the sleeve 1 is axially slidingly connected to the scale cylinder 8. The power rod 2 is arranged inside the sleeve 1 and fixedly connected to the sleeve 1. The upper part of the sleeve 1 is fixedly connected to the middle part of the power rod 2. The clutch 6 is fixedly arranged in the adjusting knob 3. The clutch 6 is clamped with the sleeve 1. The torsion spring 9 is sleeved on the power rod 2. The upper end of the torsion spring 9 extends into the interior of the sleeve 1 and is fixedly connected to the upper end of the sleeve 1. The lower end of the torsion spring 9 is fixedly connected to the lower shell 12 of the upper pen body. The injection dose is set by rotating the adjusting knob 3. The adjusting knob 3 tightens the torsion spring through the power rod 2 and the sleeve 1, so that the torsion spring 9 stores energy that can complete the injection of the corresponding injection dose when released.

[0059] A first elastic arm 6-1 is provided on the lower end surface of the clutch 6, a second elastic arm 6-2 is provided on the circumferential surface of the clutch 6, the sleeve 1 is provided in the scale cylinder 8, and radially arranged bevel teeth 1-1 are provided on one end surface of the sleeve 1, the bevel teeth 1-1 are engaged with the first elastic arm 6-1, an open gear ring 7-1 is provided at the upper opening of the upper pen body, and the second elastic arm 6-2 is engaged with the open gear ring 7-1.

[0060] It also includes a driving assembly, which includes a push rod 16, a driving nut 10 and a stop block 11. The stop block 11 is fixedly arranged in the lower shell 12 of the upper pen body, and the driving nut 10 is rotatably arranged on the upper part of the stop block 11 in the lower shell 12 of the upper pen body. The push rod 16 is threadedly connected to the driving nut 10, and the stop block 11 limits the rotation of the push rod 16 along the axis. The tail end of the push rod 16 extends into the power rod 2, and the circumferential surface of the lower end of the power rod 2 is provided with teeth 2-2 arranged in an array along the circumferential direction. A gear ring 10-2 is fixedly provided on the end face of the driving nut 10 close to the upper shell 7 of the upper pen body, and the teeth 2-2 are engaged with the gear ring 10-2.

[0061] The upper end of the power rod 2 passes through the clutch 6 and the adjusting knob 3 and extends to the upper part of the adjusting knob 3. The release button 5 is rotatably set at the upper end of the power rod 2. The release button 5 is located at the upper part of the adjusting knob 3. The return spring 4 is set inside the release button 5. One end of the return spring 4 is connected to the bottom surface of the release button 5, and the other end of the return spring 4 is connected to the top of the adjusting knob 3.

[0062] The outer circumference of the upper end of the power rod 2 is provided with longitudinal teeth 2-1 evenly arranged along the circumferential direction, and the inner circumference of the adjustment knob 3 is provided with longitudinal tooth grooves 3-1 at positions corresponding to the longitudinal teeth 2-1, and the longitudinal teeth 2-1 are slidably connected with the longitudinal tooth grooves 3-1.

[0063] The working principle of the above technical solution: The automatic injection device disclosed in the present invention can complete the injection by the patient's own operation. Preparation before injection: first remove the pen cap 13, install the needle 17, remove the needle cap on the needle, and exhaust; then adjust the dose: rotate the adjustment knob 3, the adjustment knob 3 drives the power rod 2 to rotate, and the power rod 2 drives the scale cylinder 8 to rotate through the sleeve 1. The patient can observe the scale on the scale cylinder 8 through the window. The initial scale is zero. As the scale cylinder rotates, the scale displayed in the window changes. When the scale of the dose required by the patient is reached, stop rotating the adjustment knob. The scale on the scale cylinder is arranged in a spiral from the zero scale. The spiral of the scale arrangement is the same as the shape of the thread of the groove 8-1. When the scale cylinder rotates, the sleeve 1 rotates to tighten the torsion spring 9. Energy is stored in the torsion spring 9. At this time, the sleeve The beveled teeth 1-1 on the upper end surface of the sleeve 1 engage the first elastic arm 6-1 of the clutch 6, while the second elastic arm 6-2 of the clutch 6 engages the open tooth ring 7-1 of the upper body shell 7. The clutch 6 and the upper body shell 7 are fixed relative to each other, preventing the sleeve 1 from rotating. During rotation of the adjustment knob 3, the beveled teeth 1-1 on the upper end surface of the sleeve 1 pass over the first elastic arm 6-1 of the clutch 6, producing a "clicking" sound, which provides the patient with a clear auditory effect. If the patient applies excessive force when rotating the adjustment knob 3, causing the set injection dose to exceed the desired injection dose, the adjustment knob 3 can be forcefully rotated in the opposite direction. This compresses the second elastic arm 6-2 of the clutch 6, allowing it to pass over the teeth of the open tooth ring 7-1, allowing the clutch 6 to rotate in the opposite direction, adjusting the over-adjusted dose. In the initial state, the teeth 2-2 arranged in a circumferential array on the circumferential surface of the lower end of the power rod 2 are disengaged from the tooth ring 10-2 of the drive nut 10.

[0064] After the preparation before injection and the dosage adjustment are completed, the patient inserts the needle tip 17 into the injection site and presses the release button 5. The release button 5 drives the power rod to move downward, and the teeth 2-2 arranged in an array along the circumferential direction on the circumferential surface of the lower end of the power rod 2 enter the interior of the gear ring 10-2 of the drive nut 10, so that the teeth 2-2 and the gear ring 10-2 are engaged. In actual use, the teeth and the grooves of the gear ring may not be exactly aligned. The number of teeth 2-2 and the number of grooves of the gear ring 10-2 can be increased to reduce the problem of misalignment between the teeth and the grooves. The end faces of the teeth and the grooves are chamfered so that the teeth can enter the grooves of the gear ring 10-2 more smoothly. At this time, the bevel on the upper end face of the sleeve 1 The tooth 1-1 is disengaged from the first elastic arm 6-1 of the clutch 6. At this time, the sleeve 1 is reversed under the elastic force of the torsion spring 9, and the sleeve 1 drives the power rod to rotate. The power rod 2 drives the drive nut 10 to rotate through the tooth 2-2. The drive nut 10 is threadedly connected to the push rod 16 through the internal thread 10-1. Since the stop block 11 limits the rotation of the push rod 16 along the axis, the push rod 16 can only move along the axis. When the drive nut 10 rotates, the push rod 16 moves downward, pushing the rubber piston in the cartridge to squeeze the liquid in the cartridge and discharge it from the needle tip 17. When the scale of the scale cylinder 8 returns to zero, the sleeve 1 no longer rotates, and the drive nut 10 and the push rod 16 stop at the same time. At this time, the injection of the set injection dose is completed.

[0065] The scale of the scale cylinder 8 is at zero position, and a zero limit is set on the scale cylinder 8 and the upper shell 7 of the upper pen body. After the scale of the scale cylinder 8 is reset to zero, the scale cylinder cannot continue to rotate and stops at the zero scale position. When the injection device is initially installed, a certain pre-tightening force is applied to the torsion spring 9 to ensure that when the set dose is injected, the torsion spring 9 still has a certain torque, thereby ensuring the accuracy of the injection dose and preventing the torsion spring 9 from having insufficient torque when injecting the last small part of the dose.

[0066] A thread 16-1 is provided on the circumferential surface of the push rod 16, and the thread 16-1 cooperates with the internal thread 10-1 of the drive nut 10. A limiting surface 16-2 parallel to the axis of the push rod 16 is provided on the push rod 16, and the limiting surface 16-2 contacts and cooperates with the limiting plane 11-1 of the stop block 11. The limiting plane 11-1 limits the rotation of the pull rod 16 around the axis, so that the push rod 16 can only move along the axial direction.

[0067] The oblique teeth 1-1 on the upper end surface of the sleeve 1 disengage from the first elastic arm 6-1 of the clutch 6, and at the same time, the longitudinal teeth 2-1 of the power rod 2 disengage from the longitudinal tooth grooves 3-1 of the dose adjustment button 3. Thus, during injection, the rotation of the power rod 2 will not drive the rotation of the dose button 3, thereby preventing the patient from accidentally grabbing the dose button 3 during operation and causing the injection to fail.

[0068] Press the release button 5, the sleeve 1 rotates in the opposite direction, driving the scale cylinder 8 to rotate in the opposite direction. When the injection is completed, the zero scale of the scale cylinder is displayed in the window for next use.

[0069] The driving assembly is arranged in the lower shell 12 of the upper pen body, and the dose adjustment assembly is arranged in the upper shell 7 of the upper pen body. After the driving assembly and the dose adjustment assembly are installed separately, the lower shell 12 of the upper pen body and the upper shell 7 of the upper pen body are assembled together for easy assembly.

[0070] Beneficial effects of the above technical solution:

[0071] The precision automatic injection device with adjustable injection dose described in the present invention has a graduated cylinder linked to an energy storage component disposed within the upper shell of the upper pen body. A window is provided on the upper shell of the upper pen body. By rotating the adjustment knob, the energy stored in the energy storage component for injection is adjusted according to the scale of the graduated cylinder displayed in the window. The injection dose can be accurately adjusted and different injection doses can be set according to different needs.

[0072] In one embodiment, Figure 10 As shown, a maximum dose buckle 8-2 is fixedly provided on the lower end of the scale barrel 8, and a block 12-1 is provided on the side wall of the lower shell 12 of the upper pen body. When the adjustment knob reaches the maximum adjustment angle, the block 12-1 just blocks the buckle 8-2, so that the scale barrel no longer rotates.

[0073] The working principle and beneficial effects of the above technical solution are as follows: a maximum dose buckle 8-2 is fixedly provided on the lower end of the scale barrel 8, and a clamping block 12-1 is provided on the side wall of the lower shell 12 of the upper pen body. When the adjustment knob reaches the maximum adjustment angle, the clamping block 12-1 just blocks the buckle 8-2, so that the scale barrel can no longer rotate, and the adjustment knob can no longer rotate, thereby preventing the scale barrel from excessively rotating and causing damage to the torsion spring or the dose adjustment component.

[0074] In one embodiment, Figure 11 As shown, a tail 16-3 is provided at the upper end of the push rod 16, and the upper portion of the tail 16-3 is in the shape of a barb. An annular protrusion 2-4 is provided along the circumferential direction on the inner circumference of the power rod 2 near the lower end. After all the liquid in the cartridge is injected, the barb on the upper portion of the tail 16-3 hooks the annular protrusion, so that the power rod 2 cannot move upward.

[0075] The working principle and beneficial effects of the above technical solution are as follows: a tail 16-3 is provided at the upper end of the push rod 16, and the upper part of the tail 16-3 is in the shape of a barb. An annular protrusion 2-4 along the circumferential direction is provided on the inner circumference of the power rod 2 near the lower end. After all the liquid medicine in the cartridge is injected, the barb on the upper part of the tail 16-3 hooks the annular protrusion, so that the power rod 2 cannot move upward under the action of the return spring, so that the power rod and the push rod are locked in position, and the release button cannot return to its original position, prompting the patient that the liquid medicine in the cartridge has been used up.

[0076] In one embodiment, Figure 9 As shown, the push rod return mechanism is also included. The push rod return mechanism includes a permanent magnet disposed in the drive nut 10 and an electromagnetic return assembly clamped on the outer circumference of the lower shell 12 of the upper pen body. At least four magnet slots 10-3 are provided on the outer circumferential surface of the drive nut 10 along the circumferential direction, and a permanent magnet is fixed in each magnet slot.

[0077] The electromagnetic return assembly includes a ring-shaped shell 18 and a coil winding arranged in the shell 18. The shell is arranged at a position corresponding to the drive nut 10 outside the lower shell 12 of the upper pen body. The coil winding is fixedly arranged in the shell 18 and is electrically connected to the processor.

[0078] The working principle of the above technical solution is as follows: during the use of the injection device, in order to avoid waste, the main body of the injection device can be reused multiple times. After the liquid medicine in the cartridge is completely used up, the cartridge can be replaced. Therefore, it is necessary to set a push rod doubling mechanism to return the push rod to the initial position, open a magnet groove on the outer circumference of the drive nut 10, and fix a permanent magnet in the magnet groove. A shell is set at a position corresponding to the drive nut 10 outside the lower shell 12 of the upper pen body, and a coil winding is fixed in the shell. The coil winding is connected to the power supply through an electronic commutator and a processor. When replacing the cartridge, the coil winding is connected to the power supply, so that the drive nut rotates in the opposite direction, driving the push rod 16 to move upward and return to the initial position.

[0079] The beneficial effects of the above technical solution are: the coil winding is arranged to interact with the permanent magnet on the drive nut, the push rod can be used to quickly return to its original position, the cartridge bottle can be easily replaced, the injection device can be used multiple times, and waste can be reduced.

[0080] In one embodiment, a pressure sensor is fixedly provided at the front end of the push rod 16 , and the pressure sensor is used to detect the pressure value when the lower end of the push rod 16 contacts the end surface of the rubber piston of the cartridge.

[0081] The pressure sensor is electrically connected to a processor. The processor has a preset pressure threshold range. When the pressure value is within the preset pressure threshold range, the cartridge is determined to be correctly installed. When the pressure value is less than the preset pressure threshold range, the processor turns on the power supply to the coil winding, causing the drive nut 10 to rotate, causing the drive nut 10 to drive the push rod 16 toward the cartridge. When the pressure value reaches the pressure threshold range, the processor turns off the power supply to the coil winding. When the pressure value is greater than the preset pressure threshold range, the processor turns on the power supply to the coil winding, causing the drive nut 10 to rotate in the opposite direction, causing the drive nut 10 to drive the push rod 16 away from the cartridge. When the pressure value reaches the pressure threshold range, the processor turns off the power supply to the coil winding.

[0082] The working principle of the above technical solution is as follows: when the injection device is used multiple times, the cartridge is installed on the refill holder, and then the refill holder 14 is installed on the upper pen body lower shell 12. However, whether the rubber piston of the cartridge is in contact with the push rod and the pressure between the two when in contact will affect the accuracy of the dose during the first injection. Due to manufacturing reasons, the position of the rubber piston in the cartridge is not completely consistent, and the position of the push rod 16 when it returns to the initial state is also not completely consistent each time. This may cause the push rod to be some distance away from the rubber piston after the cartridge is replaced, or the pressure of the push rod on the rubber piston is too large, which will cause the injection dose to be inaccurate during the first injection after the cartridge is replaced. A pressure sensor is provided at the lower end of the push rod to detect the distance between the lower end of the push rod and the rubber piston after the cartridge is replaced. The pressure value is within the preset pressure value threshold range, indicating that the push rod and the rubber piston are in good contact and no pressure is applied to the liquid in the cartridge bottle, and the cartridge bottle is judged to be correctly installed; if the pressure value is less than the preset pressure value threshold range, the processor turns on the power supply of the coil winding, drives the drive nut (10) to rotate, causes the drive nut 10 to drive the push rod 16 to move toward the cartridge bottle, causes the pressure value to reach the pressure value threshold range, and the processor cuts off the power supply of the coil winding; when the pressure value is greater than the preset pressure value threshold range, the processor turns on the power supply of the coil winding, drives the drive nut 10 to rotate in the opposite direction, causes the drive nut 10 to drive the push rod 16 to move away from the cartridge bottle, causes the pressure value to reach the pressure value threshold range, and the processor cuts off the power supply of the coil winding.

[0083] The beneficial effects of the above technical solution are as follows: by detecting whether the pressure value between the push rod and the rubber piston of the cartridge is within the pressure value threshold range, the contact state between the push rod and the rubber piston is determined, and the position of the push rod is adjusted through the processor and coil winding to ensure that the push rod and the rubber piston are in good contact and do not apply pressure to the liquid medicine in the cartridge, thereby ensuring the accuracy of the injection dose setting.

[0084] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0085] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0086] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A precision automatic injection device with adjustable injection dose, characterized in that: include: Upper pen body shell (7) and design A dose adjustment component is disposed on the upper shell (7) of the upper pen body, the dose adjustment component comprising an adjustment knob (3), a scale cylinder (8) and an energy storage component, the adjustment knob (3) being rotatably disposed on the upper end of the upper shell (7), an intermittent thread (7-2) being disposed on the inner circumference of the upper shell (7), a spiral groove (8-1) being provided on the outer circumference of the scale cylinder (8), the intermittent thread (7-2) being threadedly connected to the groove (8-1), a viewing window (7-3) being provided on the circumferential surface of the upper shell (7), the adjustment knob (3) being transmission-connected to the energy storage component disposed in the scale cylinder (8), and the energy stored in the energy storage component for injection is adjusted by rotating the adjustment knob (3) through the scale of the scale cylinder (8) displayed in the window (7-3); The energy storage component comprises a power rod (2), and an annular protrusion (2-4) along the circumferential direction is provided on the inner circumference of the power rod (2) near the lower end; It also includes a driving assembly, which includes a push rod (16), a tail wing (16-3) is provided at the upper end of the push rod (16), the upper part of the tail wing (16-3) is in the shape of a barb, and the upper part of the tail wing (16-3) is engaged with the annular protrusion (2-4); A pressure sensor is fixedly provided at the front end of the push rod (16), and the pressure sensor is used to detect the pressure value when the lower end of the push rod (16) contacts the end surface of the rubber piston of the cartridge bottle; The pressure sensor is electrically connected to the processor, and the processor presets a pressure value threshold range. When the pressure value is within the preset pressure value threshold range, it is determined that the cartridge bottle is correctly installed; when the pressure value is less than the preset pressure value threshold range, the processor connects the power supply of the coil winding, drives the drive nut (10) to rotate, causes the drive nut (10) to drive the push rod (16) to move toward the cartridge bottle, and makes the pressure value reach within the pressure value threshold range, and the processor cuts off the power supply of the coil winding; when the pressure value is greater than the preset pressure value threshold range, the processor connects the power supply of the coil winding, drives the drive nut (10) to rotate in the opposite direction, causes the drive nut (10) to drive the push rod (16) to move away from the cartridge bottle, and makes the pressure value reach within the pressure value threshold range, and the processor cuts off the power supply of the coil winding.

2. The precision automatic injection device with adjustable injection dosage according to claim 1, characterized in that: It also includes an upper pen body lower shell (12), and the upper pen body lower shell (12) is snap-connected with the upper pen body upper shell (7).

3. The precision automatic injection device with adjustable injection dosage according to claim 2, characterized in that: The energy storage component further comprises a sleeve (1), a clutch (6) and a torsion spring (9). The sleeve (1) is arranged inside the scale cylinder (8), and the sleeve (1) is axially slidably connected to the scale cylinder (8). The power rod (2) is arranged inside the sleeve (1) and fixedly connected to the sleeve (1). The clutch (6) is fixedly arranged inside the adjustment knob (3), and the clutch (6) is clamped with the sleeve (1). The torsion spring (9) is sleeved on the power rod (2). The upper end of the torsion spring (9) extends into the interior of the sleeve (1) and is fixedly connected to the upper end of the sleeve (1). The lower end of the torsion spring (9) is fixedly connected to the lower shell (12) of the upper pen body. The adjustment knob (3) is rotated to set the injection dose. The adjustment knob (3) tightens the torsion spring through the power rod (2) and the sleeve (1), so that the torsion spring (9) stores energy that can complete the injection of the corresponding injection dose when released.

4. The precision automatic injection device with adjustable injection dosage according to claim 3, characterized in that: A first elastic arm (6-1) is provided on the lower end surface of the clutch (6), a second elastic arm (6-2) is provided on the circumferential surface of the clutch (6), a sleeve (1) is provided in a scale cylinder (8), one end surface of the sleeve (1) is provided with radially arranged helical teeth (1-1), the helical teeth (1-1) are engaged with the first elastic arm (6-1), an open gear ring (7-1) is provided at the upper opening of the upper pen body, and the second elastic arm (6-2) is engaged with the open gear ring (7-1).

5. The precision automatic injection device with adjustable injection dosage according to claim 4, characterized in that: The invention also includes a driving assembly, which includes a driving nut (10) and a stop block (11). The stop block (11) is fixedly arranged in the lower shell (12) of the upper pen body. The driving nut (10) is rotatably arranged on the upper part of the stop block (11) in the lower shell (12) of the upper pen body. The push rod (16) is threadedly connected to the driving nut (10). The stop block (11) limits the push rod (16) from rotating along the axis. The tail end of the push rod (16) extends into the power rod (2). Teeth (2-2) arranged in an array along the circumferential direction are arranged on the circumferential surface of the lower end of the power rod (2). A gear ring (10-2) is fixedly arranged on the end surface of the driving nut (10) close to the upper shell (7) of the upper pen body. The teeth (2-2) are clamped with the gear ring (10-2).

6. The precise automatic injection device with adjustable injection dosage according to claim 5, characterized in that: The upper end of the power rod (2) passes through the clutch (6) and the adjusting knob (3) and extends to the upper part of the adjusting knob (3). The release button (5) is rotatably arranged at the upper end of the power rod (2). The release button (5) is located at the upper part of the adjusting knob (3). The return spring (4) is arranged inside the release button (5). One end of the return spring (4) is connected to the bottom surface of the release button (5), and the other end of the return spring (4) is connected to the top end of the adjusting knob (3).

7. The precise automatic injection device with adjustable injection dosage according to claim 6, characterized in that: Longitudinal teeth (2-1) arranged evenly in the circumferential direction are provided on the outer circumference of the upper end of the power rod (2); longitudinal tooth grooves (3-1) are provided on the inner circumferential surface of the adjustment knob (3) at positions corresponding to the longitudinal teeth (2-1); and the longitudinal teeth (2-1) and the longitudinal tooth grooves (3-1) are slidably connected.

8. The precise automatic injection device with adjustable injection dosage according to claim 4, characterized in that: The push rod return mechanism also includes a permanent magnet arranged in a driving nut (10) and an electromagnetic return assembly clamped on the outer circumference of the lower shell (12) of the upper pen body, at least four magnet slots (10-3) are provided on the outer circumferential surface of the driving nut (10) along the circumferential direction, and a permanent magnet is fixedly arranged in each magnet slot; The electromagnetic return assembly comprises a ring-shaped housing (18) and a coil winding arranged in the housing (18); the housing is arranged at a position corresponding to the driving nut (10) outside the upper pen body lower shell (12); the coil winding is fixedly arranged in the housing (18), and the coil winding is electrically connected to the processor.

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