A drug injection device

Abstract

The embodiment of the present application relates to a kind of medicine injection equipment, including shell, driving device and injection needle device, the shell is used to fix the driving device and injection needle device, wherein, driving device includes swing module, drive module, stop module and propulsion module;Injection needle device includes soft needle slider, force storage element, hard needle slider, energy storage element, slide chute, stop rod, push element, limit pin and trigger element;The present equipment integrates the drive module of ratchet screw cooperation, automatic injection needle module, reduces manufacturing cost and energy consumption, reduces weight, is convenient to use and carry;Output is more stable, direct, reliable, is conducive to the accurate control of the injection volume of patient's medicine liquid;Injection needle device is injected to subcutaneous, hard needle is automatically rebounded, soft needle is left in subcutaneous, reduces the number of needle puncture, reduces the risk of infection, with good antibacterial property, sealing property.

Description

Technical Field

[0001] This invention relates to the medical field, and more particularly to a drug infusion device. Background Technology

[0002] A transdermal drug delivery system is a medical device that continuously delivers medication into the patient's body to treat their condition. This device is widely used in the treatment of diabetes. A transdermal insulin pump system is a device used to infuse insulin into diabetic patients. Compared to traditional insulin pumps, transdermal insulin pumps are tubing-free, can be worn on the body, and can continuously deliver basal insulin and large doses of insulin for two to three days.

[0003] Existing patch-type drug delivery devices are bulky and inconvenient to carry, and users cannot accurately control the injection volume of the drug solution, causing great inconvenience to users. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a drug injection device that integrates a drive module with a ratchet and screw mechanism and an automatic injection needle module. This reduces manufacturing costs and energy consumption, lightens the weight, and makes it easier to use and carry. The output is more stable, direct, and reliable, which is beneficial for precise control of the amount of medication injected into the patient. The injection needle injects subcutaneously, with the hard needle automatically rebounding and the soft needle remaining subcutaneously, reducing the number of needle pricks, lowering the risk of infection, and providing excellent antibacterial and sealing properties.

[0005] In view of this, embodiments of the present invention provide a drug injection device, comprising: a housing, a driving device, and an injection needle device, wherein the housing is used to fix the driving device and the injection needle device, wherein...

[0006] The driving device includes a swing module, a drive module, a backstop module, and a propulsion module; wherein,

[0007] The swing module includes two swing arms, a central arm, an end cap, and a pusher; wherein, the two ends of the central arm are respectively connected to the two swing arms; the end cap is provided with threaded holes and has sliding arms at both ends, which slide on the two swing arms respectively, thereby realizing the engagement of the swing arms and the end cap; the pusher is fixed on the swing arms;

[0008] The drive module includes a drive screw and a drive wheel; the drive screw has threads on both its inner and outer walls, one end is located inside an end cap and screwed into the threaded hole of the end cap, and the outer wall also has a groove; the drive wheel includes a first ratchet and a second ratchet, driven by the pusher, and is sleeved on the drive screw, with a protrusion in the middle that matches the groove of the drive screw to limit the radial runout of the drive screw and to achieve synchronous rotation of the drive screw and the drive wheel, and the drive screw can slide along the axial direction of the drive wheel; the drive wheel has a notch.

[0009] The anti-reverse module is fixed to the housing and is used to restrict the unidirectional rotation of the drive wheel;

[0010] The propulsion module includes a pusher and a liquid storage tank; wherein, one end of the pusher is provided with an internal screw, which is screwed to the inner wall of the drive screw; the liquid storage tank is used to store liquid, is fixed on the housing, and is sleeved on the outside of the pusher to limit the rotation of the pusher;

[0011] The injection needle device includes a soft needle slider, a power storage element, a hard needle slider, an energy storage element, a slide groove, a stop rod, a pushing element, a limiting pin, and a triggering element; wherein...

[0012] The soft needle slider is used to fix the soft needle and has an opening at the bottom. The energy storage element is located inside the soft needle slider. The hard needle slider is used to fix the hard needle and has an opening at the bottom. The hard needle slider is located inside the energy storage element, and the energy storage element is located inside the energy storage element.

[0013] The slide groove is located between the driving device and the injection needle device, and is provided with a first limiting port and a second limiting port;

[0014] The stop rod has one end abutting against the drive wheel, and the other end passing through the first limiting opening of the slide groove and located in the opening at the bottom of the soft needle slider.

[0015] The pushing element is sleeved on the stop rod;

[0016] The limiting pin has one end that passes through the soft needle slider and is located in the opening at the bottom of the hard needle slider, and the other end that abuts against the slide groove.

[0017] The triggering element is sleeved on the limiting pin.

[0018] Preferably, the front end of the drive wheel is provided with two limiting plates that cooperate with the groove of the drive screw, and the drive wheel and the drive screw can rotate synchronously through the protrusion on the inner wall of the drive wheel and the front limiting plates.

[0019] Preferably, the housing is provided with a plurality of fixing posts, which are respectively fixed to the front end of the drive wheel by fixing seats, in order to limit the radial runout and axial movement of the drive wheel.

[0020] More preferably, the drive wheel further includes a convex ring disposed between the first ratchet and the second ratchet, and the fixing seat is disposed at the upper and lower ends of the convex ring to axially limit the drive wheel; the convex ring is provided with the notch.

[0021] Preferably, the operation of the drive device includes:

[0022] Drive wheel drive: Under the action of the first power source, the swing module rotates along the first direction, driving the end cap and pusher to move, thereby driving the first ratchet to rotate half a tooth angle along the first direction, driving the drive wheel and drive screw to rotate. Due to the limit of the push plug rotation, the rotational motion is converted into the linear stepping motion of the inner screw, driving the push plug to move axially away from the drive screw, thus promoting the infusion of the drug solution.

[0023] Retraction drive: Under the action of the second power source, the swing module rotates along the second direction, driving the end cap and the pusher to move. The pusher slides off the drive wheel. At this time, the second ratchet tends to rotate along the second direction, and the anti-retraction plate limits the rotation of the second ratchet in one direction. Due to the rotation of the end cap, the drive screw rotates relative to the end cap and moves away from the end cap, driving the pusher to move axially away from the end cap and pushing the drug infusion.

[0024] More preferably, the power source is a drive wire connected to the swing arm. When the drive wire is energized, it contracts, causing the swing arm to rotate.

[0025] Preferably, the driving device further includes limiting posts disposed on both sides of the two swing arms to limit the angle of each rotation of the swing arms to half a tooth.

[0026] Preferably, the injection needle device further includes two slide rails fixed inside the housing; the soft needle slider is slidably disposed between the two slide rails.

[0027] Preferably, the hard needle passes through the hard needle slider, the energy storage element, the power storage element, and the soft needle slider, and is fixed inside the hard needle slider, with a soft needle sleeved at one end and the other end placed in the inlet of the medicine storage tank.

[0028] Preferably, the operation of the injection needle device includes:

[0029] Initial state: One end of the stop rod abuts against the drive wheel, and the other end limits the soft needle slider. At this time, the pushing element is in a compressed state; one end of the limit pin is abutted by the slide groove, and the other end limits the hard needle slider. At this time, the triggering element is in a compressed state; both the energy storage element and the power storage element are in a compressed state.

[0030] Soft needle insertion: When the drive wheel rotates to the notch position, the stop rod moves horizontally away from the soft needle slider under the elastic force of the push element, disengages from the soft needle slider and the slide groove, and loses its limit on the soft needle slider. As a result, the soft needle slider moves downward under the elastic force of the energy storage element, and the hard needle slider and the energy storage element also move downward at the same time. The hard needle and soft needle are implanted under the skin of the human body at the same time.

[0031] Hard needle retraction: When the limiting pin moves to the second limiting port of the slide groove, it moves horizontally away from the hard needle slider under the action of the elastic force of the trigger element, and loses the limiting effect on the hard needle slider. As a result, the hard needle slider moves upward under the action of the elastic force of the energy storage element, pulling the hard needle back and detaching it from the human subcutaneous tissue, while the soft needle remains under the skin.

[0032] End state: The soft needle is placed subcutaneously, the soft needle slider is at the lower position, the energy storage element is in the released state, the hard needle and hard needle slider retract to the upper position, and the energy storage element is in the released state.

[0033] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0034] 1. The drug injection device provided in this embodiment of the invention adopts a drive mode in which a double ratchet and a screw cooperate, which has a high degree of integration, reduces manufacturing costs and energy consumption, reduces weight, and is easy to use and carry; and eliminates the influence of noise, making the use process more comfortable;

[0035] 2. The drug injection device provided in this embodiment of the invention adopts a swing module and a retractable end cap, which reduces the volume and allows for more injection sites to be selected, such as the abdomen and limbs, thereby reducing the need for multiple injections at the same site.

[0036] 3. The drug injection device provided in this embodiment of the invention uses a limiting column, and the swing arm rotates by half a tooth angle each time, resulting in a more stable, direct, and reliable output, which is beneficial for precise control of the amount of drug injected into the patient;

[0037] 4. The injection needle device of the drug injection device provided in this embodiment of the invention injects a subcutaneous needle. The hard needle automatically rebounds, while the soft needle remains subcutaneously, reducing the number of needle pricks, lowering the risk of infection, and providing excellent antibacterial and sealing properties. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a drug injection device provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of a driving device provided in an embodiment of the present invention;

[0040] Figure 3 An exploded view of a driving device and housing provided in an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of a drive wheel provided in an embodiment of the present invention;

[0042] Figure 5 This is an exploded view of an injection needle device provided in an embodiment of the present invention;

[0043] Figure 6A cross-sectional view of a drug injection device in its initial state according to an embodiment of the present invention;

[0044] Figure 7 A schematic diagram illustrating the initial state of a soft needle insertion device according to an embodiment of the present invention;

[0045] Figure 8 This is a schematic diagram illustrating the state of a device at the end of needle insertion, as provided in an embodiment of the present invention.

[0046] Figure 9 This is a schematic diagram of the device state after the hard needle retracts, provided as an embodiment of the present invention. Detailed Implementation

[0047] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0048] Figure 1 This is a schematic diagram of a drug injection device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a driving device provided in an embodiment of the present invention. Figure 3 This is an exploded view of a driving device and housing provided in an embodiment of the present invention, combined with... Figure 1 and Figure 3 As shown, the drug injection device provided in this embodiment includes a housing 10, a drive device 20, and an injection needle device 30. The components of the device will be described below.

[0049] The housing 10 is used to fix the drive unit 20 and the injection needle device 30.

[0050] The drive unit 20 specifically includes a swing module, a drive module, a backstop module, and a propulsion module. The structure of each part of the drive unit 20 will be described in detail below.

[0051] The swing module 201 is used to receive power from the power source to generate swing, thereby driving the pusher 203. Specifically, it includes two swing arms 2011, a central arm 2012, an end cap 202, and a pusher 203.

[0052] Specifically, the two ends of the central arm 2012 are connected to two swing arms 2011, which can be integrated into one unit. The two swing arms 2011 are specifically the first swing arm and the second swing arm. The power source mentioned above includes, but is not limited to, electromagnetic drive and drive wires. In a specific example, the power source is two drive wires, which are connected to the two swing arms 2011 respectively. When the drive wires are energized, they contract, causing the swing arms to rotate. Specifically, the first drive wire is connected to the first swing arm, and the second drive wire is connected to the second swing arm. When the first drive wire is energized, it contracts due to heat, causing the first swing arm to move downwards, while the second swing arm moves upwards, thus generating rotational motion. When the second drive wire is energized, it generates rotational motion in the opposite direction.

[0053] The pusher 203 specifically includes a first pusher and a second pusher, which can be a metal sheet. Its function is to drive the drive wheel 205 to rotate and is fixed on the swing module 201. For ease of installation, the two pushers 203 are preferably integrated into a double-paddle structure and fixed on a swing arm 2011. When the swing arm 2011 rotates, it will drive the pusher 203 to rotate.

[0054] The end cap 202 has a threaded hole in the middle for engaging with the drive screw 204. Sliding arms are located at both ends of the end cap 202, engaging with the swing arms 2011. These sliding arms are respectively mounted on the two swing arms 2011, thus achieving the engagement of the swing module 201 and the end cap 202. It should be noted that the swing arms 2011 and the end cap 202 slide relative to each other during the injection of medicine into the storage tank, and are then fixedly connected afterward, maintaining a fixed connection during the injection of medicine into the human body.

[0055] The drive module includes a drive screw 204 and a drive wheel 205.

[0056] Specifically, the drive screw 204 has threads on both its inner and outer walls. One end is located inside the end cover 202, and the threads on the outer wall are screwed into the threaded hole of the end cover 202. The other end is located in the through hole of the center arm 2012. Furthermore, the outer wall of the drive screw 204 is also provided with a groove.

[0057] Drive wheel 205, combined Figure 4As shown, the device includes a first ratchet 2051 and a second ratchet 2052. Both ratchets have the same number of teeth and are driven by two pushers 203. When the pushers 203 rotate, they drive the drive wheel 205 to rotate. Specifically, when the first pusher 203 is located at the root of the first ratchet 2051, the second pusher 203 is located at the middle of the teeth of the second ratchet 2052, covering half of the gear. It can be understood that the above effect can be achieved by the two gears being staggered, offset by half a tooth, or by the two gears being set synchronously and the two pushers 203 being staggered to achieve the above effect. Furthermore, the drive wheel 205 is sleeved on the drive screw 204. The inner wall of the drive wheel 205 is provided with a protrusion that matches the groove of the drive screw 204. The groove and the protrusion cooperate with each other to limit the radial runout of the drive screw 204 and realize the synchronous rotation of the drive screw 204 and the drive wheel 205. The drive wheel 205 is provided with a notch, which is preferably located at the connection of two ratchet wheels to trigger the operation of the injection needle device 30.

[0058] In some preferred embodiments, the front end of the drive wheel 205 is provided with two limiting plates 2053 that cooperate with the groove of the drive screw 204. The limiting plates 2053 and the protrusions on the inner wall of the drive wheel 205 and the limiting plates 2053 can be integrated into one design. The drive wheel 205 and the drive screw can rotate synchronously through the protrusions on the inner wall of the drive wheel 205 and the front limiting plates 2053.

[0059] In some preferred embodiments, in order to ensure the stability of the drive device 20 during operation, a plurality of fixing posts 101 are provided on the housing 10, which are respectively fixed to the front end of the bottom of the drive wheel 205 and the center arm 2012 by fixing seats 102, in order to limit the radial runout of the drive wheel 205 and the center arm 2012. Specifically, fixing seats 102 are provided at the left and right ends of the connection between the first ratchet 2051 and the second ratchet 2052, and fixing posts 101 are provided on the fixing seats 102, so that the drive wheel 205 is radially and axially limited by the fixing posts 101 and the fixing seats 102. Furthermore, there are two fixing seats 102, one located at the lower part of the first ratchet 2051 and the other located at the upper part of the second ratchet 2052, so as to axially limit the drive wheel 205. Furthermore, fixed seats 102 are provided on both sides of the bottom end of the central arm 2012, and fixed posts 101 are provided on the fixed seats 102, thereby radially limiting the central arm 2012 through the fixed posts 101 and fixed seats 102.

[0060] In a more preferred embodiment, the drive wheel 205 further includes a convex ring 2054 disposed between the first ratchet 2051 and the second ratchet 2052. The two fixing seats 102 are respectively disposed at the upper and lower ends of the convex ring 2054, thereby axially limiting the drive wheel 205. The convex ring 2054 is provided with a notch, which cooperates with the injection needle device 30 to trigger the injection needle device 30.

[0061] The thrust-stop module 206, specifically, can be two anti-reverse plates, similar to the pusher 203, fixed on the housing 10. Specifically, it includes a first anti-reverse plate and a second anti-reverse plate, used to restrict the unidirectional rotation of the drive wheel 205. The two anti-reverse plates are preferably an integrated double-paddle structure, fixed on the housing 10. It can be understood that the two anti-reverse plates are in contact with the two ratchet wheels respectively. When the first anti-reverse plate is located at the root of the first ratchet wheel 2051, the second anti-reverse plate is located at the middle of the tooth of the second ratchet wheel 2052, thereby restricting the unidirectional rotation of the drive wheel 205.

[0062] The propulsion module includes a pusher 207 and a liquid storage tank 208.

[0063] Specifically, the push plug 207 is disposed inside the liquid storage tank 208 to force out the liquid inside the tank 208. One end is provided with an internal screw 2071, which is threaded onto the inner wall of the drive screw 204. Thus, the internal screw 2071 can be unscrewed from the drive screw 204, causing the push plug 207 to move axially. Preferably, a rubber sealing ring 2072 is provided at the front of the push plug 207 to achieve a seal within the liquid storage tank 208.

[0064] The liquid storage tank 208, fixed to the housing 10, is used to store liquid. It is sleeved on the outside of the push plug 207, which is rotated and limited. The push plug 207 can be axially displaced within the liquid storage tank 208 to achieve liquid injection and output. It should be noted that those skilled in the art can select the liquid stored in the liquid storage tank 208 as needed. The liquid includes, but is not limited to, insulin, glucagon, antibiotics, nutrient solutions, analgesics, morphine, anticoagulants, gene therapy drugs, cardiovascular drugs, or chemotherapy drugs.

[0065] Based on the understanding of the structure of the drive device 20 provided in this embodiment, the following is combined with... Figures 1 to 4 The working process and principle are described below.

[0066] The drug injection device provided in this embodiment includes a drive wheel drive and a reversing drive in the drug dispensing process.

[0067] Drive wheel drive: Under the action of the first power source, the swing module 201 rotates along the first direction, driving the end cover 202 and the first pusher 203 to move, thereby driving the first ratchet 2051 to rotate by half a tooth angle along the first direction, driving the drive wheel 205 and the drive screw 204 to rotate, and the inner screw on the push plug 207 will generate relative rotational motion. Since the push plug 207 is set in the liquid storage tank 208, the rotation of the push plug 207 is limited and cannot rotate. Therefore, the rotational motion is converted into the linear stepping motion of the inner screw 2071, driving the push plug 207 to move axially away from the drive screw 204, pushing the liquid infusion; at this time, the two anti-reverse plates 206 pass over the two ratchets, without restricting the rotation of the ratchets.

[0068] Retraction Drive: Under the action of the second power source, the swing module 201 rotates in the second direction, driving the end cap 202 and the pusher 203 to move. The pusher 203 slides off the drive wheel 205. At this time, the second ratchet 2052 tends to rotate in the second direction, and the anti-retraction plate 206 limits the rotation of the drive wheel 205 in one direction, thereby restricting the rotation of the drive wheel 205. Due to the rotation of the end cap 202 by half a tooth, the drive screw 204 generates relative rotation and moves away from the end cap 202, driving the pusher 207 to move axially away from the end cap 202, thus promoting drug infusion. At this time, the pusher 203 slides off the ratchet surface. It can be understood that drug infusion is also driven during this retraction process, with no idle stroke and low structural energy consumption.

[0069] It should be noted that during both the drive wheel drive and the reversing drive processes, the drive wheel 205 does not move axially, thereby avoiding radial runout of the ratchet. Furthermore, the reduction in moving parts makes the structure more stable and the structure more precise.

[0070] To ensure that each drive rotates by half a tooth, the drive device 20 also includes two limiting posts, which are set on both sides of the two swing arms 2011. These posts limit the angle of each rotation of the swing arms 2011 to half a tooth. The angle of the swing arms 2011 rotating to the limiting posts is half a tooth, and the swing arms 2011 stop rotating when they reach the limiting posts.

[0071] The first direction is opposite to the second direction. The first direction can be clockwise or counterclockwise, and those skilled in the art can set it as needed. The first power source includes, but is not limited to, the first driving wire, and the second power source includes, but is not limited to, the second driving wire.

[0072] Understandably, depending on the different working pushers 203 and anti-reverse plates 206, the driving process of the drive device 20 can be divided into four stages: the first drive wheel drive stage, where the first pusher 203 drives the first ratchet 2051; the second retraction drive stage, where the second anti-reverse plate 206 pushes the second ratchet 2052; the third drive wheel drive stage, where the second pusher 203 drives the second ratchet 2052; and the fourth retraction drive stage, where the first anti-reverse plate 206 pushes the first ratchet 2051. This cycle repeats continuously. It is understood that for the drive wheel 205 to rotate one tooth pitch, the first pusher 203 and the second pusher 203 must alternately complete the rotation.

[0073] It should be noted that the injection volume each time is determined by the upward displacement generated by the push plug 207. The upward displacement generated by the push plug 207 is related to the rotation angle of the swing arm 2011, the number and rotation angle of the ratchet teeth, the drive screw 204, and the thread pitch of the inner screw. For example, the more ratchet teeth there are, the smaller the rotation angle generated each time, and the smaller and more accurate the drug dosage each time. Therefore, those skilled in the art can set the rotation angle of the swing arm 2011, the number and rotation angle of the ratchet teeth, the drive screw 204, and the thread pitch of the inner screw according to the needs of each drug dosage.

[0074] The above is an introduction to the structure and working process of the drive device 20. The liquid output from the storage tank 208 will be injected into the subcutaneous tissue of the human body through the injection needle device 30, combined with... Figure 5 As shown, the injection needle device 30 includes a soft needle slider 301, a power storage element 302, a hard needle slider 303, an energy storage element 304, a slide groove 305, a stop rod 306, a push element 307, a limit pin 308, and a trigger element 309. The structure of each part of the injection needle device 30 will be described below.

[0075] The soft needle slider 301 is used to fix the soft needle 3010. It has a first opening at the bottom for fixing the stop rod 306. In addition, the soft needle slider 301 also has a second opening for fixing the limit pin 308. The power storage element 302 is located inside the soft needle slider 301.

[0076] The hard needle slider 303 is used to fix the hard needle 3030, and has an opening at the bottom for fixing the limiting pin 308. The hard needle slider 303 is located inside the energy storage element 304, and the energy storage element 304 is located inside the power storage element 302. Preferably, the hard needle 3030 passes through the hard needle slider 303, the energy storage element 304, the power storage element 302, and the soft needle slider 301 in sequence, and is fixed in the through groove inside the hard needle slider 303. One end is fitted with a soft needle, and the other end is placed in the inlet of the medicine storage tank.

[0077] The slide groove 305 is located between the drive device 20 and the injection needle device 30, and has a first limiting port and a second limiting port. The first limiting port is adapted to the stop rod 306, and the second limiting port is adapted to the limiting pin 308. It should be noted that those skilled in the art can set the positions of the first limiting port and the second limiting port according to the positions of the injection needle device 30 and the drive device 20.

[0078] The stop rod 306 has one end abutting against the drive wheel 205, and the other end passing through the first limiting port of the slide groove 305 and located in the first opening at the bottom of the soft needle slider 301. The pushing element 307 is sleeved on the stop rod 306. It can be understood that the stop rod 306 is the triggering mechanism of the injection needle. In the initial state, one end of the stop rod 306 abuts against the drive wheel 205, and the other end limits the soft needle slider 301. At this time, the pushing element 307 is in a compressed state. When the drive wheel 205 rotates to the notch position, the pushing element 307 releases elastic potential energy, causing the stop rod 306 to disengage from the soft needle slider 301.

[0079] The limiting pin 308 has one end passing through the second opening of the soft needle slider 301 and located inside the opening at the bottom of the hard needle slider 303, while the other end abuts against the slide groove 305. The trigger element 309 is sleeved on the limiting pin 308. It can be understood that the limiting pin 308 is the trigger mechanism for the movement of the hard needle slider 303. In the initial state, one end of the limiting pin 308 is abutted by the slide groove 305, and the other end limits the movement of the soft needle slider 301. At this time, the trigger element 309 is in a compressed state.

[0080] In order to enable the sliding of the soft needle slider 301 and the hard needle slider 303, the injection device 30 also includes two slide rails 310, which are fixed inside the housing 10. The soft needle slider 301 may have protrusions on both sides, which slide between the two slide rails 310 and can move along the slide rails.

[0081] Based on an understanding of the structure of the injection needle device 30 provided in this embodiment, combined with Figures 6 to 9 As shown below, its working process and principle will be introduced.

[0082] Initial state: One end of the stop rod 306 abuts against the drive wheel 205, and the other end passes through the first limiting port of the slide groove 305 and is placed in the first opening of the soft needle slider 301, thereby limiting the soft needle slider 301. At this time, the pushing element 307 is in a compressed state; one end of the limiting pin 308 is abutted by the slide groove 305, and the other end passes through the second opening of the soft needle slider 301 and is located in the opening at the bottom of the hard needle slider 303, limiting the hard needle slider 303. At this time, the trigger element 309 is in a compressed and stored state; the energy storage element 304 and the power storage element 302 are both in a compressed and stored state.

[0083] Soft needle insertion: When the drive wheel 205 rotates to the notch position, the stop rod 306 moves horizontally away from the soft needle slider 301 under the elastic force of the pushing element 307, disengaging from the soft needle slider 301 and the slide groove 305, losing its limit on the soft needle slider 301. The energy storage element 302 releases elastic potential energy, and the soft needle slider 301 moves downward under the elastic force of the energy storage element 302. Since the limiting pin 308 fixes the hard needle slider 303 and the soft needle slider 301 together, the soft needle slider 301 moves downward while simultaneously driving the hard needle slider 303 and the energy storage element 304 to move downward as well. At this time, the hard needle 3030 and the soft needle 3010 are simultaneously implanted under the skin of the human body.

[0084] Hard needle retraction: When the limiting pin 308 moves to the second limiting port of the slide groove 305, under the action of the elastic force of the trigger element 309, it moves horizontally away from the hard needle slider 303, losing the limiting effect on the hard needle slider 303. The energy storage element 304 releases elastic potential energy, and the hard needle slider 303 moves upward under the action of the elastic force of the energy storage element 304, pulling the hard needle 3030 back and detaching it from the subcutaneous tissue of the human body, while the soft needle 3010 remains under the skin.

[0085] End state: The soft needle is placed under the skin, the soft needle slider 301 is in the lower position, the energy storage element 302 is in the released state, the hard needle and hard needle slider 303 retract to the upper position, the energy storage element 304 is in the released state, at this time the soft needle 3010 is still fitted on the hard needle, the liquid storage tank 208 can fill the hard needle 3030 with medicine, and it can be infused into the human body through the soft needle 3010.

[0086] The drug injection device provided in this invention has a high degree of integration, reduces manufacturing costs and energy consumption, lightens weight, and is easy to use and carry. It adopts a drug injection detection module, which provides more stable, direct, and reliable output, which is conducive to precise control of the amount of drug injected into the patient. The injection needle device injects the needle subcutaneously, with the hard needle automatically rebounding and the soft needle remaining subcutaneously, reducing the number of needle pricks, lowering the risk of infection, and having good antibacterial and sealing properties.

[0087] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0088] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0089] In the description herein, the terms "a specific embodiment," "some embodiments," "one embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A drug injection device, characterized in that, The drug injection device includes a housing, a drive unit, and an injection needle assembly. The housing is used to fix the drive unit and the injection needle assembly. The driving device includes a swing module, a drive module, a backstop module, and a propulsion module; wherein, The swing module includes two swing arms, a central arm, an end cap, and a pusher; wherein, the two ends of the central arm are respectively connected to the two swing arms; the end cap has a threaded hole in the middle and sliding arms at both ends, the sliding arms are respectively slidably mounted on the two swing arms, thereby realizing the engagement of the swing arms and the end cap; the pusher is fixed on the swing arms; The drive module includes a drive screw and a drive wheel. The drive screw has threads on both its inner and outer walls. One end of the drive screw is located inside an end cap and screwed into a threaded hole in the end cap. The outer wall also has a groove. The drive wheel includes a first ratchet and a second ratchet, which are driven by the pusher. The drive wheel is sleeved on the drive screw and has a protrusion in the middle that matches the groove of the drive screw, used to limit the radial runout of the drive screw and to achieve synchronous rotation between the drive screw and the drive wheel. The drive screw can slide axially along the drive wheel. The anti-reverse module is fixed to the housing and used to limit the unidirectional rotation of the drive wheel. The propulsion module includes a pusher and a liquid storage tank; wherein, one end of the pusher is provided with an internal screw, which is screwed to the inner wall of the drive screw; the liquid storage tank is used to store liquid, is fixed on the housing, and is sleeved on the outside of the pusher to limit the rotation of the pusher; The injection needle device includes a soft needle slider, a power storage element, a hard needle slider, an energy storage element, a slide groove, a stop rod, a pushing element, a limiting pin, and a triggering element; wherein... The soft needle slider is used to fix the soft needle and has an opening at the bottom. The energy storage element is located inside the soft needle slider. The hard needle slider is used to fix the hard needle and has an opening at the bottom. The hard needle slider is located inside the energy storage element, and the energy storage element is located inside the energy storage element. The slide groove is located between the driving device and the injection needle device, and is provided with a first limiting port and a second limiting port; The stop rod has one end abutting against the drive wheel, and the other end passing through the first limiting opening of the slide groove and located in the opening at the bottom of the soft needle slider. The pushing element is sleeved on the stop rod; The limiting pin has one end that passes through the soft needle slider and is located in the opening at the bottom of the hard needle slider, and the other end that abuts against the slide groove. The triggering element is sleeved on the limiting pin; A notch is provided at the connection between the first ratchet and the second ratchet, and the notch is used to trigger the stop lever of the injection needle device.

2. The drug injection device according to claim 1, characterized in that, The front end of the drive wheel is provided with two limiting plates that cooperate with the groove of the drive screw. The drive wheel and the drive screw can rotate synchronously through the protrusion on the inner wall of the drive wheel and the limiting plates at the front end of the drive wheel.

3. The drug injection device according to claim 1, characterized in that, The housing is provided with multiple fixing posts, and fixing seats are provided at the left and right ends of the connection between the first ratchet and the second ratchet. The fixing posts are provided on the fixing seats, and the multiple fixing posts are respectively fixed to the front end of the drive wheel through the fixing seats to limit the radial runout and axial movement of the drive wheel.

4. The drug injection device according to claim 3, characterized in that, The drive wheel also includes a convex ring, which is disposed between the first ratchet and the second ratchet. The fixing seat is disposed at the upper and lower ends of the convex ring to axially limit the drive wheel. The convex ring is provided with the notch.

5. The drug injection device according to claim 1, characterized in that, The operation process of the drive device includes: Drive wheel drive: Under the action of the first power source, the swing module rotates along the first direction, driving the end cap and pusher to move, thereby driving the first ratchet to rotate half a tooth angle along the first direction, driving the drive wheel and drive screw to rotate. Due to the limit of the push plug rotation, the rotational motion is converted into the linear stepping motion of the inner screw, driving the push plug to move axially away from the drive screw, thus promoting the infusion of the drug solution. Retraction drive: Under the action of the second power source, the swing module rotates along the second direction, driving the end cap and the pusher to move. The pusher slides off the drive wheel. At this time, the second ratchet tends to rotate along the second direction. The anti-retraction plate of the anti-retraction module limits the rotation of the second ratchet in one direction. Due to the rotation of the end cap, the drive screw rotates relative to the end cap and moves away from the end cap, driving the pusher to move axially away from the end cap and pushing the drug infusion.

6. The drug injection device according to claim 5, characterized in that, The power source is a drive wire, which is connected to the swing arm. When the drive wire is energized, it contracts, causing the swing arm to rotate.

7. The drug injection device according to claim 1, characterized in that, The drive device also includes a limiting post, which is set on both sides of the two swing arms to limit the angle of each rotation of the swing arms to half a tooth.

8. The drug injection device according to claim 1, characterized in that, The injection needle device also includes two slide rails fixed inside the housing; the soft needle slider is slidably disposed between the two slide rails.

9. The drug injection device according to claim 1, characterized in that, The hard needle passes through the hard needle slider, energy storage element, power storage element, and soft needle slider, and is fixed inside the hard needle slider. One end is fitted with a soft needle, and the other end is placed in the drug inlet of the liquid storage tank.

10. The drug infusion device according to claim 1, characterized in that, The operation process of the injection needle device includes: Initial state: One end of the stop rod abuts against the drive wheel, and the other end limits the soft needle slider. At this time, the pushing element is in a compressed state; one end of the limit pin is abutted by the slide groove, and the other end limits the hard needle slider. At this time, the triggering element is in a compressed state; both the energy storage element and the power storage element are in a compressed state. Soft needle insertion: When the drive wheel rotates to the position where the notch and the stop rod of the injection device are triggered, the stop rod moves horizontally away from the soft needle slider under the action of the elastic force of the pushing element, disengages from the soft needle slider and the slide groove, and loses its limit on the soft needle slider. As a result, the soft needle slider moves downward under the action of the elastic force of the energy storage element, and the hard needle slider and the energy storage element also move downward at the same time. The hard needle and the soft needle are implanted under the skin of the human body at the same time. Hard needle retraction: When the limiting pin moves to the second limiting port of the slide groove, it moves horizontally away from the hard needle slider under the action of the elastic force of the trigger element, and loses the limiting effect on the hard needle slider. As a result, the hard needle slider moves upward under the action of the elastic force of the energy storage element, pulling the hard needle back and detaching it from the human subcutaneous tissue, while the soft needle remains under the skin. End state: The soft needle is placed subcutaneously, the soft needle slider is at the lower position, the energy storage element is in the released state, the hard needle and hard needle slider retract to the upper position, and the energy storage element is in the released state.

Images