An electromagnetic impact needle-free injection device

Abstract

An electromagnetic impact needle-free injection device includes a medicine storage bottle, a medicine suction and bubble discharge component, a striker, and a voice coil motor motion component. The medicine suction and bubble discharge mechanism drives the piston push rod to complete the absorption of liquid medicine and the discharge of air. After the voice coil motor mover is powered on, the voice coil motor mover retracts into the voice coil motor stator chamber. At this time, a fixed spacing distance is generated between the voice coil motor mover and the striker. After the power-on direction of the voice coil motor mover is changed, the voice coil motor mover accelerates and moves a certain distance, and then strikes the push rod with a certain initial velocity. Under the impact of the instantaneous impact force, a small amount of medicine in the medicine storage bottle is ejected from the nozzle of the medicine storage bottle in a high-speed jet, piercing the skin to produce an injection hole. After the impact is completed, there is no relative gap between the voice coil motor mover, the striker, and the piston push rod, providing the voice coil motor mover with a continuous voltage input slightly less than before, ensuring that the remaining liquid medicine in the medicine storage bottle enters the human body along the injection hole.

Description

Technical Field

[0001] The present invention relates to an electromagnetic impact needle-free injection device, in particular, using pre-accelerated electromagnetic kinetic energy to impact and puncture the skin to produce an injection hole, and then using continuous electromagnetic thrust to allow the remaining liquid medicine to enter the human body along the injection hole, belonging to the field of medical devices. Background Art

[0002] The needle-free injection device uses the principle of high-pressure jet to converge the drug solution into a thinner liquid stream, which instantly penetrates the skin and enters the subcutaneous tissue. It is a new type of drug delivery injection device.

[0003] The needle-free injection devices currently on the market that use springs and ammunition as kinetic energy have the problem that the kinetic energy cannot be accurately adjusted, that is, the injection depth and dosage cannot be accurately adjusted; high-pressure gas can be used to adjust the kinetic energy, but it is necessary to carry a high-pressure gas cylinder source, which is inconvenient to carry and poses a safety hazard; the electromagnetic power component of the traditional electromagnetic force needle-free syringe is always in a fixed state with the syringe piston. Although the kinetic energy can be adjusted, in order to provide the initial kinetic energy for piercing the skin, the motor is large in size, and the power and size required for the power supply are large. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of controlling the drug jet energy during the entire injection process. A needle-free injection device using electromagnetic force as the power source comes into being in order to cope with the problems of large size, heavy weight and high cost of power components and power supply components caused by the traditional electromagnetic power components and the syringe piston being in a fixed state.

[0005] The needle-free injection device with impact explosive force and continuous electromagnetic force allows precise control of drug delivery to the surface of the human body or animal by selecting a smaller voice coil motor, a smaller power source and a smaller size. After the electromagnetic power component is pre-accelerated to a certain speed, the electromagnetic kinetic energy impacts and punctures the skin to produce an injection hole, and then uses continuous electromagnetic thrust to complete the remaining liquid medicine entering the human body along the injection hole. The electromagnetic impact needle-free injection device includes a drug storage bottle for storing liquid medicine; a drug suction and bubble discharge assembly, which drives the piston push rod to complete the absorption of liquid medicine and the discharge of air; and a striker for transmitting the impact force and subsequent continuous thrust; and a voice coil motor motion assembly.

[0006] The power of the drug suction and bubble discharge component is generated by the rotation of the drug suction motor component, or by the rotation of the gear by the finger. The drug suction motor component further includes a hollow cup motor, which can rotate clockwise or counterclockwise. The drug suction and bubble discharge component further includes an angle sensor for automatically sensing the rotation angle and angular velocity of the motor. The drug suction and bubble discharge component further includes a controller and a driver, and the controller obtains the feedback of the angle sensor and automatically adjusts the output of the driver. The drug suction motor component further includes a pair of gears. The hollow cup motor shaft is connected to the first gear through the central transition shaft supported on the inner ring of the bearing, and the hollow cup motor housing is connected to the outer ring of the bearing through the base structure. The rotation of the hollow cup motor is transmitted to the first gear, and the first gear drives the second gear to rotate. The center of the second gear includes a rectangular hole, which forms a clearance fit with the square shaft section of the piston push rod. The piston push rod further includes a piston cylindrical section, a square shaft section, and a screw thread section. The drug suction and bubble discharge component further includes a set of nut screws. The screw threaded section of the piston push rod and the nut form a nut screw pair, which is used to convert the rotational motion of the gear into the axial displacement of the piston push rod to achieve the absorption of the medicine liquid and the discharge of air bubbles.

[0007] The voice coil motor motion assembly includes a substrate, a voice coil motor mover, and a voice coil motor stator. The voice coil motor motion assembly further includes a motion control circuit, which provides kinetic energy for the voice coil motor mover.

[0008] In one embodiment, the controller in the drug suction and bubble discharge component obtains feedback from the angle sensor to automatically adjust the output of the driver, controls the voltage value and the voltage sign in the hollow cup motor to be positive, and the hollow cup motor drives the first gear and the second gear to rotate. The second gear drives the piston push rod to move through the nut screw pair, thereby forming a negative pressure in the drug storage bottle, and the external drug enters the drug storage bottle through the micropores at the end of the drug storage bottle; after all the drugs to be injected enter the drug storage bottle, the voltage value and the voltage sign in the hollow cup motor are controlled to be negative, so that the piston push rod can move in the opposite direction to discharge the air in the drug storage bottle.

[0009] Before the injection of the liquid medicine, the motion control circuit controls the voltage polarity in the voice coil motor mover coil to be negative, and the voice coil motor mover retracts into the voice coil motor stator chamber and maintains a certain distance from the piston push rod. The voice coil motor mover accelerates and moves for a certain distance before contacting the striker. The voice coil motor mover hits the piston push rod at a certain initial velocity. Under the compression of the instantaneous impact force, a small amount of medicine in the medicine storage bottle is ejected from the nozzle of the medicine storage bottle in a high-speed jet, piercing the skin to produce an injection hole; after the impact is completed, the voice coil motor mover, the striker and the piston push rod have no relative gap, and after the motor mover contacts the striker, the voice coil motor mover, the striker and the piston push rod move simultaneously without relative gap; during the simultaneous movement without relative gap, a continuous voltage input slightly less than the previous one is provided to the voice coil motor mover to ensure that most of the liquid medicine in the medicine storage bottle enters the human body along the injection hole; the continuous voltage input comes from the electric energy provided by the motion control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The foregoing and other objects, features and advantages of the present invention will become more apparent and clear from the following more detailed description of the preferred embodiments of the present invention as shown in the accompanying drawings, in which like reference numerals are used to refer to like parts in the various drawings. The drawings are not necessarily drawn to scale, emphasis being placed on illustrating the principles of the invention.

[0011] Attached Figure 1 Schematic diagram of the liquid absorption and air discharge structure of the present invention; Figure 2 Schematic diagram of the impact structure of the present invention; Figure 3 It is a schematic diagram of the overall structure of the present invention; Figure 4 It is a schematic cross-sectional view of the overall structure of the present invention; the figure includes: a medicine storage bottle 1, a medicine suction and bubble discharge component 2, a striker 3, a voice coil motor motion component 4, a voice coil motor mover 5, a voice coil motor stator 6, a substrate 7, a motion control circuit 8, a piston push rod 9, a medicine suction motor component 10, a hollow cup motor 11, a first gear 12, a second gear 13, a central transition shaft 14, and a base 15. DETAILED DESCRIPTION

[0012] The needle-free injection device uses the principle of high-pressure jet to converge the drug solution into a thinner liquid stream, which instantly penetrates the skin and enters the subcutaneous tissue. It is a new type of drug delivery injection device.

[0013] The needle-free injection devices currently on the market that use springs and ammunition as kinetic energy have the problem that the kinetic energy cannot be accurately adjusted, that is, the injection depth and dosage cannot be accurately adjusted; high-pressure gas can be used to adjust the kinetic energy, but it is necessary to carry a high-pressure gas cylinder source, which is inconvenient to carry and poses a safety hazard; the electromagnetic power component of the traditional electromagnetic force needle-free syringe is always in a fixed state with the syringe piston. Although the kinetic energy can be adjusted, in order to provide the initial kinetic energy for piercing the skin, the motor is large in size, and the power and size required for the power supply are large.

[0014] In order to control the energy of drug jet during the whole injection process, needle-free injection devices using electromagnetic force as kinetic energy came into being. This is to address the problem that the power components and power supply components are large in size, heavy in weight and high in cost due to the fixed connection between the traditional electromagnetic power components and the syringe piston.

[0015] The needle-free injection device with impact explosive force and continuous electromagnetic force allows precise control of drug delivery to the surface of the human body or animal by selecting a smaller voice coil motor, a smaller power source and a smaller size. After the electromagnetic power component is pre-accelerated to a certain speed, the electromagnetic kinetic energy impacts and punctures the skin to produce an injection hole, and then uses continuous electromagnetic thrust to complete the remaining liquid medicine entering the human body along the injection hole. The electromagnetic impact needle-free injection device includes a drug storage bottle 1 for storing liquid medicine; a drug suction and bubble discharge assembly 2, which drives the piston push rod 9 to complete the absorption of liquid medicine and the discharge of air; and a striker 3 for transmitting impact force and subsequent continuous thrust; and a voice coil motor motion assembly 4.

[0016] The power of the drug suction and bubble discharge component 2 is generated by the rotation of the drug suction motor component 10, or by the rotation of the gear by the finger. The drug suction motor component 10 further includes the hollow cup motor 11, which can rotate clockwise or counterclockwise. The drug suction and bubble discharge component 2 further includes an angle sensor for automatically sensing the rotation angle and angular velocity of the motor. The drug suction and bubble discharge component 2 further includes a controller and a driver, and the controller obtains the feedback of the angle sensor and automatically adjusts the output of the driver. The drug suction motor component 10 further includes a pair of gears. The hollow cup motor 11 is connected to the first gear 12 through the central transition shaft 14, and the outer shell of the hollow cup motor 11 and the outer ring of the bearing are connected through the base 15 structure. The rotation of the hollow cup motor 11 is transmitted to the first gear 12, and the first gear 12 drives the second gear 13 to rotate. The center of the second gear 13 includes a rectangular hole, which forms a clearance fit with the square shaft section of the piston push rod 9. The piston push rod 9 further includes a piston cylindrical section, a square shaft section, and a screw thread section. The drug suction and bubble discharge assembly 2 further includes a set of nut screws. The screw thread section of the piston push rod 9 and the nut form a nut screw pair, which is used to convert the rotational motion of the gear into the axial displacement of the piston push rod 9 to achieve the absorption of the drug solution and the discharge of air bubbles.

[0017] The voice coil motor motion component 4 includes a substrate 7 , a voice coil motor mover 5 , and a voice coil motor stator 6 . The voice coil motor motion component 4 further includes a motion control circuit 8 , which provides kinetic energy for the voice coil motor mover 5 .

[0018] In one embodiment, the controller in the drug suction and bubble discharge component 2 obtains the feedback of the rotation angle sensor to automatically adjust the output of the driver, controls the voltage value and the voltage sign in the hollow cup motor 11 to be positive, and the hollow cup motor 11 drives the first gear 12 and the second gear 13 to rotate through the central transition shaft 14, and the second gear 13 drives the piston push rod 9 to move through the nut screw pair, so as to form a negative pressure in the drug storage bottle 1, and the external drug enters the drug storage bottle 1 through the micropores at the end of the drug storage bottle 1; after all the drugs to be injected enter the drug storage bottle 1, the voltage value and the voltage sign in the hollow cup motor 11 are controlled to be negative, so that the piston push rod 9 can move in the opposite direction to discharge the air in the drug storage bottle.

[0019] Before the injection of the liquid medicine, the motion control circuit 8 controls the voltage polarity of the voice coil motor mover 5 to be negative, and the voice coil motor mover 5 retracts into the chamber of the voice coil motor stator 6, and keeps a certain distance from the piston push rod 9. The voice coil motor mover 5 accelerates and moves a certain distance before contacting the striker 3. The voice coil motor mover 5 hits the piston push rod 9 at a certain initial velocity. Under the compression of the instantaneous impact force, a small amount of medicine in the medicine storage bottle 1 is ejected from the nozzle of the medicine storage bottle 1 in the form of a high-speed jet, piercing the skin to produce an injection hole. After the impact is completed, there is no relative gap between the voice coil motor mover 5, the striker 3 and the piston push rod 9. After the voice coil motor mover 5 contacts the striker 3, the voice coil motor mover 5, the striker 3 and the piston push rod 9 move simultaneously without a relative gap. During the simultaneous movement without a relative gap, a continuous voltage input slightly smaller than the previous one is provided to the voice coil motor mover 5 to ensure that most of the liquid medicine in the medicine storage bottle 1 enters the human body along the injection hole. The continuous voltage input comes from the electric energy provided by the motion control circuit 8.

Claims

1. An electromagnetic impact needle-free injection device, characterized in that: The device comprises a medicine storage bottle (1) for storing medicine liquid; a medicine suction and air bubble discharge component (2), the medicine suction and air bubble discharge component drives a piston push rod (9) to complete the suction of medicine liquid and the discharge of air; and a striker (3) for transmitting an impact force and a subsequent continuous thrust; and a voice coil motor motion component (4); The power of the medicine suction and bubble discharge component (2) is generated by the rotation of the medicine suction motor component (10); The piston push rod (9) comprises a piston cylindrical section, a square shaft section, and a screw thread section; The voice coil motor motion assembly (4) comprises a substrate (7), a voice coil motor mover (5), and a voice coil motor stator (6); The medicine suction and bubble discharge assembly (2) comprises a set of nut screws, which are used to convert the rotational motion of the gear into the axial displacement of the piston push rod (9); The drug inhalation motor assembly (10) comprises a coreless cup motor (11), which can rotate clockwise or counterclockwise; The drug suction motor assembly (10) comprises a pair of gears; The medicine suction and bubble discharge component (2) comprises a rotation angle sensor for automatically sensing the rotation angle and angular velocity of the motor; The medicine suction and bubble discharge component (2) comprises a controller and a driver, and the controller obtains feedback from the rotation angle sensor and automatically adjusts the output of the driver; The pair of gears comprises a first gear (12) and a second gear (13); The first gear (12) is connected to the coreless cup motor (11) via a central transition shaft (14) and rotates together; The center of the second gear (13) includes a rectangular hole, and the rectangular hole forms a clearance fit with the square shaft section of the piston push rod (9).

2. The electromagnetic impact needle-free injection device according to claim 1, characterized in that: The voice coil motor motion component (4) comprises a motion control circuit (8), which provides kinetic energy for the voice coil motor mover (5).

Images