Drug injection system

Abstract

A drug injection system comprises a bottom plate (10), a driving device (20) and a needle assisting device (30), the bottom plate (10) is used for fixing the driving device (20) and the needle assisting device (30), and the driving device (20) comprises a driving module (202), a pushing mechanism (203), a rotating wheel (204), a first threaded rod (206), a second threaded rod (210) and a propelling module; wherein the driving module (202) is used for driving the pushing mechanism (203) to rotate along a first direction and a second direction; the pushing mechanism (203) is provided with threads, and the rotating wheel (204) is pushed by the pushing mechanism (203) to rotate, so that rotation in the first direction is achieved; the first threaded rod (206) can synchronously rotate along with the rotating wheel (204) and / or axially move relative to the rotating wheel (204), and is in threaded connection with the thread of the pushing module (203) and the thread of the second threaded rod (210); the second threaded rod (210) is fixedly connected with the push plug (211), and the propelling module comprises the push plug (211) and a liquid storage tank (212); and the liquid storage tank (212) is fixed on the bottom plate (10) and is used for storing liquid.

Description

A drug infusion system Technical Field

[0001] The present application relates to the medical field, and in particular to a drug injection system. Background Art

[0002] A patch-type drug delivery device is a medical device that continuously infuses medication into the patient's body to treat their condition. It is widely used in the treatment of diabetes. The patch-type insulin pump system is a device used to infuse insulin for diabetic patients. Compared to traditional insulin pumps, the patch-type insulin pump is tubeless and can be worn on the body, continuously delivering basal and bolus insulin over two to three days.

[0003] Existing patch-type drug delivery devices are large in size and inconvenient to carry, and users cannot accurately control the injection metering of the drug solution, which causes great trouble to users.

[0004] Summary of the Invention

[0005] The purpose of this application is to address the defects of the existing technology and provide a drug injection system with high integration, reduced manufacturing cost and energy consumption, reduced weight, and easy use and carrying; it adopts a drug injection detection module, and the output is more stable, direct and reliable, which is conducive to precise control of the amount of drug injection for the patient; the needle-assisting device assists the needle subcutaneously, the hard needle automatically rebounds, and the soft needle remains subcutaneously, which reduces the number of needle insertions, reduces the risk of infection, and has good antibacterial and sealing properties.

[0006] Specifically, the present application relates to a drug injection system, wherein the drug injection system includes a base plate, a driving device and a needle-assisting device, and the base plate is used to fix the driving device and the needle-assisting device, wherein the driving device includes a driving module, a pushing mechanism, a rotating wheel, a first threaded rod, a second threaded rod and a propulsion module; wherein the driving module is used to drive the pushing mechanism to rotate along a first direction and a second direction; the pushing mechanism is provided with a thread, and the rotating wheel is driven to rotate by the pushing module to realize rotation in the first direction; the first threaded rod can rotate synchronously with the rotating wheel and / or be axially displaced relative to the rotating wheel, and is screwed to the thread of the pushing module and to the thread of the second threaded rod; the second threaded rod is fixed to the push plug, and the propulsion module includes a push plug and a liquid storage tank; wherein the liquid storage tank is fixed on the base plate for storing liquid.

[0007] In this application, the drive module functions as a power source for the drug injection system. In this application, the needle-assisting device may also be referred to as the needle-injecting device, but its meaning is subject to the function and structure described in detail in this application.

[0008] The driving working process of the drug injection system of the present application includes: when the pushing mechanism rotates along the first direction, the pushing mechanism drives the rotating wheel to rotate synchronously in the first direction, the first threaded rod rotates synchronously with the rotating wheel and rotates relative to the second threaded rod, at this time the second threaded rod generates an axial displacement relative to the first threaded rod, pushing the plunger to move, and then when the pushing mechanism rotates in the second direction, the rotating wheel does not rotate, the first threaded rod does not rotate, the first threaded rod generates an axial displacement relative to the pushing mechanism, driving the second screw rod to synchronously displace, pushing the plunger to move: wherein, the first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction.

[0009] In the present application, when the first direction is clockwise, the second direction is counterclockwise, or when the first direction is counterclockwise, the second direction is clockwise.

[0010] In a specific embodiment, the pushing mechanism includes a swing arm, a pushing module, and a stop module, wherein the pushing module is connected to the swing arm, the pushing module drives the swing arm to rotate in the first direction and the second direction, the pushing module pushes the ratchet to rotate in the same direction along the first direction, and the stop module acts on the rotating wheel to control the unidirectional rotation of the rotating wheel.

[0011] In this application, the specific form of the rotating wheel is not limited, as long as it can display the above functions, and those skilled in the art can make appropriate choices. In one embodiment, the rotating wheel is a ratchet. In one embodiment, the rotating wheel has a structure that cooperates with the propulsion module, such as a slot, that is, a rotating wheel with a slot. In one embodiment, the propulsion module is a gear and the rotating wheel is a gear. In one embodiment, the rotating wheel has a magnetic grid or air chamber, which can be driven and rotated by the propulsion module in a non-contact manner.

[0012] In a specific embodiment, the first threaded rod is an external screw tube, which is arranged in the rotating wheel and can rotate synchronously with the rotating wheel and / or move axially relative to the rotating wheel. The outer wall of the first threaded rod is provided with a thread, which is screwed to the screw hole of the swing arm. The inner wall of the first threaded rod is provided with an internal thread, which is screwed to the second threaded rod. Preferably, one end of the push plug is provided with an external screw, which is screwed to the inner wall of the first threaded rod; the liquid storage tank is sleeved on the outside of the push plug to limit the rotation of the push plug.

[0013] In another specific embodiment, the first threaded rod includes an outer screw tube, an inner screw tube, a second force storage module, a limiting plate and a telescopic sleeve; the inner screw tube has a thread on the inner wall and can be connected to the outer screw tube, and one end of the inner screw tube is passed through the second force storage module, and the outer wall of the inner screw tube is provided with a sliding groove, which is slid onto the telescopic sleeve through the sliding groove, and the top end of the inner wall of the outer screw tube is provided with a torsion spring limiting area; the second force storage module is arranged in the torsion spring limiting area of ​​the outer screw tube; the limiting plate is connected to the second force storage module, the limiting plate is fixed on the top surface of the outer screw tube, and is clamped in the limiting groove on the top surface of the swing arm, the second force storage module is limited to the telescopic sleeve of the outer screw tube by the limiting plate, and one end is arranged in the outer screw tube for guiding the axial displacement of the inner screw tube; the outside of the outer screw tube is provided with a thread that is screwed with the thread of the pushing module.

[0014] In a specific embodiment, the second force storage module is a clamping torsion spring. One end of the inner coil is passed through the second force storage module, which means that the inner coil can pass through the second force storage module and be disposed inside the second force storage module.

[0015] In a specific embodiment, the second threaded rod is an external screw rod on the push plug.

[0016] In a specific embodiment, the thread provided on the pushing mechanism is a screw hole. In another embodiment, the thread provided on the pushing mechanism is an external thread.

[0017] In a specific embodiment, the needle-assisting device includes a track pressure plate, a soft needle slider, a hard needle slider, two connecting rods, a first force storage module, a limiter and a trigger rod; the track pressure plate is fixed on the base plate; the soft needle slider is used to fix the soft needle and is arranged on the track of the track pressure plate; the hard needle slider is arranged on the track of the track pressure plate and above the soft needle slider, and is used to fix the hard needle, and the hard needle is connected to the liquid storage tank; the two connecting rods include a first connecting rod and a second connecting rod, the first connecting rod is connected to the hard needle slider, and the second connecting rod is connected to the first force storage module through a pin shaft, and is used to drive the two connecting rods to rotate when the first force storage module releases elastic potential energy; the limiter is fixed on the base plate, and is used to limit the movement of the first force storage module, the hard needle slider or the two connecting rods, thereby keeping the first force storage module in a compressed state; the trigger rod is constrained on the base plate, one end of the trigger rod is limited by the limiting surface of the rotating wheel, and the other end of the trigger rod limits the limiter.

[0018] In another embodiment, the trigger rod can be split into three parts: a rotating shaft, a trigger rod body, and a push rod, wherein the trigger rod body and the push rod are fixed to the bottom plate through the rotating shaft.

[0019] Furthermore, the drug dispensing process of the drug injection system of the present application includes: a rotary wheel drive: when the drive module is working, the rotary wheel is a ratchet, which drives the swing arm to rotate in a first direction, and drives the ratchet, the outer screw and the limit plate to rotate in the first direction through the pushing module. At this time, the limit plate slides out of the limit groove, and the second force storage module releases and clamps the inner screw. The inner screw rotates in the first direction. Due to the rotation limit of the push plug, the inner screw is rotated out, thereby driving the push plug to axially displace and squeeze out the liquid in the liquid storage tank; retreat drive: when the drive module is working, it drives the swing arm to rotate in the second direction, and the retreat stop module presses against the ratchet tooth surface to prevent rotation. Due to the axial limit of the swing arm and the ratchet, the outer screw is rotated out, driving the torsion spring, the inner screw, the inner screw and the push plug to axially displace and squeeze out the liquid in the liquid storage tank.

[0020] In a specific embodiment, the driving device also includes a first step detection module, including a drug quantity detection piece and a first external brush, one end of the drug quantity detection piece is fixed to the bottom of the rotor and connected to the first external brush, and the other end is arranged on the inner wall of the outer coil; during the drug filling process of the liquid storage tank, when the liquid in the liquid storage tank increases, the plunger drives the inner coil to move axially toward the outer coil, and when the liquid increases to a preset volume, the drug quantity detection piece contacts the inner coil, the circuit is turned on, and the system determines that the second storage module can be triggered to clamp the inner coil; during the drug discharging process, when the liquid in the liquid storage tank is lower than the preset volume, the drug quantity detection piece is separated from the contact with the inner coil, and the circuit is disconnected at this time.

[0021] Furthermore, the first step detection module further includes a detection resistor and a detection brush; the detection resistor is fixed to the bottom of the rotor and electrically connected to the first external brush, and the detection brush is arranged at the bottom of the outer coil;

[0022] When the wheel rotates and the outer solenoid moves in steps, the detection brush and the detection resistor form a loop and are connected to the first external brush. As a result, the resistance value changes each time the wheel rotates and the outer solenoid moves in steps, thereby detecting the amount of each movement.

[0023] In a specific embodiment, the driving device also includes a second step detection module, including a second external brush and a rotation detection piece. The rotation detection piece is provided with a plurality of notches, fixed at the bottom of the rotating wheel, and connected to the second external brush. When the rotation detection piece rotates to the notch, the circuit is disconnected. When it rotates to a non-notch, it is connected to the second external brush, thereby realizing rotation detection.

[0024] Among them, the needle-assisting process of the drug injection system includes: in the initial state, the limiting surface of the rotating wheel limits the trigger rod, the trigger rod lifts the limiting part, and the limiting part limits the movement of the hard needle slider or the second connecting rod, so that the first force storage module remains in a compressed state; when the rotating wheel rotates, the trigger rod passes over the limiting surface of the rotating wheel and rotates, the limiting part falls, and the hard needle slider or the second connecting rod is disengaged from the limit of the limiting part. At this time, the first force storage module is released, driving the second connecting rod and the first connecting rod to rotate, thereby driving the hard needle slider and the soft needle slider to move downward along the track of the track pressure plate, thereby completing the needle-assisting. After that, the soft needle slider is limited to the bottom of the track pressure plate, and the hard needle slider is reset.

[0025] In a specific embodiment, the needle-assisting device includes a push rod, the limiting piece is a limiting plate, and the second connecting rod is provided with a slot adapted to the limiting plate; in the initial state, the limiting plate is lifted by the push rod, thereby engaging with the slot of the second connecting rod, thereby achieving the suppression of the first force storage module by limiting the second connecting rod; when the trigger rod passes the limiting surface of the rotating wheel, driving the push rod to rotate, at this time the limiting plate falls and disengages from the second connecting rod, thereby the first force storage module disengages from the limit and is released, driving the second connecting rod and the first connecting rod to rotate.

[0026] In a specific embodiment, the needle-assisting device includes a push rod, and the limiting component is a first limiting rod. One end of the first limiting rod is fixed to the base plate by a pin. In the initial state, the other end of the first limiting rod is lifted by the push rod, thereby resisting the hard needle slider, thereby achieving the suppression of the first force storage module by limiting the hard needle slider; when the push rod passes over the limiting surface of the rotating wheel and rotates, the first limiting rod rotates at this time, and the hard needle slider is disengaged from the limit of the first limiting rod, thereby the first force storage module is disengaged from the limit and released, driving the second connecting rod and the first connecting rod to rotate.

[0027] In a specific embodiment, the needle-assisting device includes a push rod, and the limiting component includes a second limiting rod and a limiting pressure plate. One end of the second limiting rod is fixed to the base plate by a pin shaft, and one end of the limiting pressure plate is fixed to the track pressure plate and is provided with a limiting groove; in the initial state, the other end of the second limiting rod is lifted by the push rod, thereby being against the limiting pressure plate. At this time, the limiting groove limits the hard needle slider, thereby achieving the suppression of the first force storage module by limiting the hard needle slider; when the trigger rod passes the limiting surface of the rotating wheel, driving the push rod to rotate, at this time the second limiting rod rotates, and the limiting pressure plate is disengaged from the contact with the hard needle slider, thereby the first force storage module is disengaged from the limit and released, driving the second connecting rod and the first connecting rod to rotate.

[0028] More specifically, the embodiment of the present application provides a drug injection system, a base plate, a driving device and a needle-assisting device, wherein the base plate is used to fix the driving device and the needle-assisting device, wherein:

[0029] The driving device includes a swing arm, a driving module, a pushing module, a ratchet, a backstop module, an outer solenoid, an inner solenoid and a propulsion module; wherein,

[0030] The swing arm has a screw hole in the middle, and the swing arm is axially limited; the driving module is used to drive the swing arm to rotate; the pushing module is set on the swing arm;

[0031] The ratchet is driven to rotate by the pushing module, and a limiting surface is provided on the outer wall of the ratchet, and the ratchet is axially limited;

[0032] The anti-retraction module is fixed on the bottom plate and is used to control the one-way rotation of the ratchet;

[0033] The outer spiral tube is fixedly arranged in the ratchet wheel, and can rotate synchronously with the ratchet wheel or move axially relative to the ratchet wheel. The outer wall of the outer spiral tube is provided with a thread, which is screwed into the screw hole of the swing arm;

[0034] One end of the inner spiral tube is arranged in the outer spiral tube, and the interior of the inner spiral tube is provided with an internal thread;

[0035] The propulsion module includes a push plug and a fluid storage tank; wherein,

[0036] The push plug has an inner screw at one end, and the inner screw is screwed to the inner wall of the inner spiral tube;

[0037] The liquid storage tank is fixed on the bottom plate, used for storing liquid, and is sleeved on the outside of the push plug to limit the rotation of the push plug;

[0038] The needle-assisting device includes a track pressing plate, a soft needle slider, a hard needle slider, two connecting rods, a first force storage module, a limiter and a trigger assembly;

[0039] The track pressing plate is fixed on the bottom plate;

[0040] The soft needle slider is used to fix the soft needle and is slidably arranged on the track of the track pressure plate;

[0041] The hard needle slider is slidably mounted on the track of the track pressure plate and is located above the soft needle slider for fixing the hard needle, which is connected to the liquid storage tank;

[0042] The two connecting rods include a first connecting rod and a second connecting rod, wherein the first connecting rod is connected to the hard needle slider, and the second connecting rod is connected to the first force storage module via a pin, and is used to drive the two connecting rods to rotate when the first force storage module releases elastic potential energy;

[0043] The limiting member is fixed to the bottom plate and is used to limit the movement of the first force storage module, the hard needle slider or the second connecting rod, thereby keeping the first force storage module in a compressed state;

[0044] The trigger assembly includes a rotating shaft, a trigger rod and a push rod. The rotating shaft is fixed on the base plate. The trigger rod and the push rod are fixed on the rotating shaft. One end of the trigger rod is limited by the limiting surface of the ratchet. The push rod is arranged below the limiting member.

[0045] Preferably, the drug dispensing process of the drug injection system includes:

[0046] Ratchet drive: The drive module works to drive the swing arm to rotate in the first direction, and the ratchet and the outer screw are driven to rotate in the first direction through the push module, and the inner screw is driven to rotate in the first direction. Due to the rotation limit of the push plug, the inner screw is rotated out, thereby driving the push plug to axially displace and press out the liquid in the liquid storage tank;

[0047] Retraction drive: The driving module works to drive the swing arm to rotate in the second direction, and the anti-retraction module presses against the tooth surface of the ratchet wheel to prevent it from rotating. Due to the axial limitation of the swing arm and the ratchet wheel, the outer screw is screwed out, driving the inner screw and the push plug to axially move, thereby pressing out the liquid in the liquid storage tank;

[0048] The first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction.

[0049] Preferably, the driving device further includes a second force storage module, a limiting piece and a telescopic sleeve;

[0050] A torsion spring limiting area is provided at the top end of the inner wall of the outer spiral tube;

[0051] The second force storage module is arranged in the torsion spring limiting area of ​​the outer solenoid;

[0052] The limiting piece is connected to the second force storage module, the limiting piece is fixed to the top surface of the outer solenoid, and is clamped in the limiting groove on the top surface of the swing arm. The second force storage module is limited to the torsion spring limiting area of ​​the outer solenoid through the limiting piece;

[0053] The telescopic sleeve has one end disposed in the outer spiral tube and is used to guide the axial displacement of the inner spiral tube;

[0054] The inner spiral tube has one end passing through the second power storage module, and an outer wall thereof is provided with a sliding groove, and is slidably mounted on the telescopic sleeve through the sliding groove.

[0055] Further preferably, the drug dispensing process of the drug injection system includes:

[0056] Ratchet drive: The drive module works to drive the swing arm to rotate in the first direction, and the push module drives the ratchet, the outer screw, and the limit plate to rotate in the first direction. At this time, the limit plate slides out of the limit groove, and the second force storage module releases and holds the inner screw, and the inner screw rotates in the first direction. Due to the rotation limit of the push plug, the inner screw is screwed out, thereby driving the push plug to axially displace and press out the liquid in the liquid storage tank;

[0057] Retraction drive: The driving module works to drive the swing arm to rotate in the second direction, and the anti-retraction module presses against the ratchet tooth surface to prevent it from rotating. Due to the axial limitation of the swing arm and the ratchet, the outer screw is screwed out, driving the torsion spring, inner screw, inner screw and push plug to axially move, thereby squeezing out the liquid in the liquid storage tank.

[0058] Further preferably, the driving device further comprises a first step detection module, comprising a drug quantity detection piece and a first external brush, wherein one end of the drug quantity detection piece is fixed to the bottom of the ratchet and connected to the first external brush, and the other end is arranged on the inner wall of the outer spiral tube;

[0059] During the injection process of the liquid storage tank, when the liquid in the liquid storage tank increases, the push plug drives the inner coil to move axially toward the outer coil. When the liquid increases to a preset volume, the drug amount detection piece contacts the inner coil, the circuit is connected, and the system triggers the second storage module to clamp the inner coil.

[0060] During the medicine dispensing process, when the liquid in the liquid storage tank is lower than the preset volume, the medicine quantity detection piece is separated from the contact with the inner spiral tube, and the circuit is disconnected.

[0061] Further preferably, the first step detection module further includes a detection resistor and a detection brush; the detection resistor is fixed to the bottom of the ratchet and electrically connected to the first external brush, and the detection brush is arranged at the bottom of the outer solenoid;

[0062] When the ratchet rotates and the outer solenoid moves in steps, the detection brush and the detection resistor form a loop and are connected to the first external brush. As a result, the resistance value changes each time the ratchet rotates and the outer solenoid moves in steps, thereby detecting the amount of each movement.

[0063] Preferably, the driving device also includes a second step detection module, including a second external brush and a rotation detection piece. The rotation detection piece is provided with a plurality of notches, fixed at the bottom of the ratchet, and connected to the second external brush. When the rotation detection piece rotates to the notch, the circuit is disconnected. When it rotates to a non-notch, it is connected to the second external brush, thereby realizing rotation detection.

[0064] Preferably, the needle-assisted process of the drug injection system includes:

[0065] In the initial state, the limiting surface of the ratchet limits the trigger rod, the push rod lifts the limiting part, and the limiting part limits the movement of the hard needle slider or the second connecting rod, so that the first force storage module remains in a compressed state; when the ratchet rotates, the trigger rod passes over the limiting surface of the ratchet, driving the push rod to rotate, the limiting part falls, and the hard needle slider or the second connecting rod disengages from the limit of the limiting part. At this time, the first force storage module is released, driving the second connecting rod and the first connecting rod to rotate, thereby driving the hard needle slider and the soft needle slider to move downward along the track of the track pressure plate, thereby completing the needle assist. After that, the soft needle slider is limited to the bottom of the track pressure plate, and the hard needle slider is reset.

[0066] Preferably, the limiting member is a limiting plate, and the second connecting rod is provided with a slot adapted to the limiting plate;

[0067] In the initial state, the limiting piece is lifted up by the push rod, thereby engaging with the slot of the second connecting rod, thereby suppressing the first power storage module by limiting the position of the second connecting rod;

[0068] When the trigger rod passes over the limiting surface of the ratchet wheel, it drives the push rod to rotate. At this time, the limiting piece falls and disengages from the second connecting rod. As a result, the first force storage module is released from the limit and drives the second connecting rod and the first connecting rod to rotate.

[0069] Preferably, the limiting member is a first limiting rod, one end of which is fixed to the bottom plate via a pin, and in an initial state, the other end of the first limiting rod is lifted up by the push rod, thereby abutting against the hard needle slider, thereby achieving the suppression of the first force storage module by limiting the hard needle slider;

[0070] When the trigger rod passes the limiting surface of the ratchet, it drives the push rod to rotate. At this time, the first limiting rod rotates, and the hard needle slider disengages from the limit of the first limiting rod. As a result, the first force storage module disengages from the limit and is released, driving the second connecting rod and the first connecting rod to rotate.

[0071] Preferably, the limiting member includes a second limiting rod and a limiting pressure plate, one end of the second limiting rod is fixed to the bottom plate through a pin, and one end of the limiting pressure plate is fixed to the track pressure plate and is provided with a limiting groove;

[0072] In the initial state, the other end of the second limiting rod is lifted by the push rod, thereby abutting against the limiting pressure plate. At this time, the limiting groove limits the hard needle slider, thereby suppressing the first force storage module by limiting the hard needle slider;

[0073] When the trigger rod passes the limiting surface of the ratchet, it drives the push rod to rotate. At this time, the second limiting rod rotates, and the limiting pressure plate is disengaged from the contact with the hard needle slider. As a result, the first force storage module is disengaged from the limit and released, driving the second connecting rod and the first connecting rod to rotate.

[0074] Compared with the prior art, the advantages and positive effects of this application are:

[0075] 1. The drug injection system provided by the embodiment of the present application adopts a driving mode in which a ratchet screw cooperates with each other, which has a high degree of integration, reduces manufacturing costs and energy consumption, reduces weight, is easy to use and carry, and eliminates the impact of noise, making the use process more comfortable;

[0076] 2. The drug injection system provided in the embodiments of the present application adopts a retractable drive mode, which reduces the volume and allows for more injection sites to be selected, such as the abdomen, limbs, etc., thereby reducing multiple injections in the same site;

[0077] 3. The drug injection system provided by the embodiment of the present application adopts a drug injection detection module, which has a more stable, direct and reliable output, and is conducive to accurately controlling the amount of drug solution injected into the patient;

[0078] 4. The embodiment of the present application provides a needle-assisting device for a drug injection system to assist subcutaneous injection. The hard needle automatically rebounds and the soft needle remains subcutaneously, which reduces the number of needle insertions, reduces the risk of infection, and has excellent antibacterial and sealing properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] FIG1 is a schematic structural diagram of a drug injection system provided in an embodiment of the present application;

[0080] FIG2 is a schematic structural diagram of a driving device provided in an embodiment of the present application;

[0081] FIG3 is an exploded schematic diagram of a driving device provided in an embodiment of the present application;

[0082] FIG4 is a schematic diagram of the arrangement of the pushing module and the anti-retraction module provided in an embodiment of the present application;

[0083] FIG5 is a schematic diagram of a first step detection module provided in an embodiment of the present application;

[0084] FIG6 is a schematic diagram of a second step detection module provided in an embodiment of the present application;

[0085] FIG7 is a schematic diagram of a horizontally placed auxiliary needle structure provided in an embodiment of the present application;

[0086] FIG8 is a schematic diagram of the initial state of the limiting piece provided in an embodiment of the present application;

[0087] FIG9 is a schematic diagram of the auxiliary needle state with the limiting piece provided in an embodiment of the present application;

[0088] FIG10 is a schematic diagram of a vertically arranged auxiliary needle structure according to an embodiment of the present application;

[0089] FIG11 is a schematic diagram of the initial state of the limiting rod provided in an embodiment of the present application;

[0090] FIG12 is a schematic diagram of the initial state of a limiting rod and a limiting pressure plate provided in an embodiment of the present application.

[0091] FIG13 is a schematic diagram of the initial state of a limit member and a trigger rod provided in an embodiment of the present application. DETAILED DESCRIPTION

[0092] The technical solution of the present application is further described in detail below through the accompanying drawings and examples.

[0093] FIG1 is a schematic structural diagram of a drug injection system provided in an embodiment of the present application. As shown in FIG1 , the drug injection system includes a base plate 10 , a drive device 20 and a needle-assisting device 30 . The components of the system are introduced below respectively.

[0094] The base plate 10 is used to fix the driving device 20 and the needle assisting device 30 .

[0095] The driving device 20, as shown in Figures 2 and 3, specifically includes a swing arm 201, a driving module 202, a pushing module 203, a ratchet 204, a backstop module 205, an outer screw 206, an inner screw 210 and a propulsion module (a push plug 211, a liquid storage tank 212). The following is a detailed introduction to the structures of each part of the driving device 20.

[0096] The swing arm 201 receives external driving force to generate rotation, thereby driving the pushing module 203. The swing arm 201 can be a plate-like structure with a screw hole in the middle. In this embodiment, the swing arm 201 is fixed on the base plate 10, and the base plate 10 is provided with corresponding limiting columns to limit the axial position of the swing arm 201.

[0097] The driving module 202 is used to generate an external driving force to drive the swing arm to rotate. Specifically, it can be connected to the swing arm 201. The driving module includes but is not limited to two driving wires, which are respectively connected to the two ends of the swing arm 201. In a specific example, the driving wire here can be a metal wire, the property of which is that it shrinks when heated to generate a driving force. When the driving wire is energized, it drives the swing arm 201 to rotate. Specifically, when the driving device 20 is working, it alternately energizes the two driving wires, and the wires change from a relaxed state to a contracted state, thereby generating a driving force and driving the swing arm 201 to rotate. Optionally, the driving device 20 also includes a swing arm limiting surface fixed on the base plate 10. When the swing arm 201 rotates to the swing arm limiting surface, the driving wire 202 stops being energized.

[0098] The two pushing modules 203 are used to drive the ratchet 204 to rotate. As shown in FIG4 , the pushing modules 203 can be specifically two pushing plates, one located at each end of the swing arm 201. When the swing arm 201 rotates, the pushing modules 203 are driven to rotate. The two pushing modules 203 are staggered so that at different driving stages, there is always one pushing module 203 located at the root of the ratchet 204 to drive the ratchet 204 to rotate.

[0099] The ratchet 204 is driven to rotate by the push module 203. Specifically, a plurality of teeth are provided on the upper portion of the outer wall of the ratchet 204. The push module 203 drives the ratchet 204 to rotate via the teeth of the ratchet 204. The base plate 204 also axially limits the ratchet 204. A variety of axial limiting methods can be used, including but not limited to providing a rotating component on the ratchet base 204, and axially limiting the ratchet 204 via the base plate. Furthermore, a limiting surface 2041 is provided on the outer wall of the ratchet 204, which triggers the needle-assisting device 30. Optionally, to ensure the stability of the ratchet 204 during rotation, the drive device 20 further includes two fixing plates and a fixing post for limiting the position of the ratchet 204. The two fixing plates are respectively provided on either side of the ratchet 204, and the fixing post is fixed between the two fixing plates, thereby fixing the ratchet 204 between the fixing post and the two fixing plates, thereby radially limiting the ratchet 204.

[0100] The backstop module 205 is fixed to the base plate 10 and connected to the ratchet 204. Its function is to control the unidirectional rotation of the ratchet 204. As shown in Figure 4, the backstop module 205 can be specifically two stoppers, arranged in an interlaced manner. Such that there is always one backstop module 205 located at the root of the ratchet 204 teeth, restricting the ratchet 204 from unidirectional rotation. Alternatively, the backstop module 205 can also be implemented as a one-way bearing to achieve its function.

[0101] The outer screw 206 is arranged inside the ratchet 204, and can be specifically cooperated with the slide groove and the key, thereby, the outer screw 206 can rotate synchronously with the ratchet 204 or axially displace relative to the ratchet; the outer wall of the outer screw 206 is provided with a thread, which is screwed into the screw hole of the swing arm 201, thereby realizing the relative movement of the outer screw 206 and the swing arm 201, that is, the outer screw 206 can realize axial displacement.

[0102] The inner spiral tube 210 has an internal thread inside, and one end is set in the outer spiral tube. Specifically, the rotation limit can be completed through a slot. When the user injects the medicine into the inner tube to the full amount, the inner spiral tube 210 moves toward the direction close to the outer spiral tube 206 and reaches the end axial limit surface, thereby forming an actual fixed connection. After starting work, the inner spiral tube 210 is driven to rotate and move together with the rotation and axial displacement of the outer spiral tube 206.

[0103] The push plug 211 is disposed within the liquid storage tank 212 and is used to press the liquid out of the liquid storage tank 212. An internal screw 2111 is provided at one end. The internal screw 2111 is threadedly engaged with the inner wall of the internal spiral tube 210. Thus, the internal screw can be unscrewed from the internal spiral tube 210, driving the axial displacement of the push plug 211. Preferably, a rubber sealing ring is provided at the front of the push plug 211 to achieve a seal on the liquid within the liquid storage tank 212.

[0104] The liquid storage tank 212 is fixed to the base plate 10 and is used to store liquid. It is sleeved on the outside of the plunger 211 and provides a rotational limit for the plunger 211. The plunger 211 can be axially displaced within the liquid storage tank 212 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 212 as needed. The liquid includes but is not limited to insulin, glucagon, antibiotics, nutrient solution, analgesics, morphine, anticoagulants, gene therapy drugs, cardiovascular drugs, or chemotherapy drugs.

[0105] Based on the understanding of the structure of the driving device 20 provided in this embodiment, its working process and principle are introduced below with reference to FIG. 1 to FIG. 4 .

[0106] The drug dispensing process of the drug injection system provided in this embodiment includes ratchet drive and retraction drive.

[0107] Ratchet drive: The drive module 202 is activated, driving the swing arm 201 to rotate in a first direction. This, in turn, drives the ratchet 204 and outer solenoid 206 in the first direction through the push module 203. At this point, the outer solenoid 206 and inner solenoid 210 can be considered fixedly connected, and the inner solenoid 210 also rotates in the first direction. Since the plunger 211 is located within the liquid reservoir 212 and cannot rotate, the rotational motion of the inner solenoid 210 is converted into a linear stepping motion of the plunger 211. The inner screw 2111 rotates out, thereby driving the plunger 211 to axially move away from the outer solenoid 206, expelling the liquid from the liquid reservoir 212. At this point, the stop module 205 passes over the ratchet 204, unrestricting its rotation.

[0108] During the retraction drive, the drive module 202 operates, driving the swing arm 201 to rotate in the second direction. Because the retraction stop module 205 abuts against the teeth of the ratchet 204 to prevent it from rotating, the swing arm 201 rotates relative to the outer screw 206. Due to the axial restraint between the swing arm 201 and the ratchet 204, the outer screw 206 rotates out, driving the inner screw 210, the inner screw 2111, and the plunger 211 to axially displace, expelling the liquid from the liquid reservoir 212. At this point, the push module 203 slides off the surface of the ratchet 204. It is understood that this retraction process also drives drug infusion, eliminating idle travel and minimizing energy consumption.

[0109] 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.

[0110] It should be noted that during the driving wheel driving and retraction driving processes, the driving wheel 205 does not make axial movement, thereby avoiding radial runout of the ratchet. Furthermore, the reduction in moving parts makes the structural stability more reliable and the structural accuracy higher.

[0111] In some preferred embodiments, the drive device further includes a second force storage module 207, a limiting plate 208, and a telescopic sleeve 209. Specifically, a torsion spring limiting area is provided at the top of the inner wall of the outer coil 206 for accommodating the second force storage module 207. The second force storage module 207 is disposed within the torsion spring limiting area of ​​the outer coil 206, with one end fixed therein. The limiting plate 208 is connected to the second force storage module 207 and is used to limit the second force storage module 207. Specifically, the limiting plate 208 is fixed on the top surface of the outer screw tube 206 and is clamped in the limiting groove on the top surface of the swing arm 201. The second force storage module 207 is limited to the torsion spring limiting area of ​​the outer screw tube 206 by the limiting plate 208. It should be understood that when the outer screw tube 206 rotates, it will drive the limiting plate 208 to rotate. When it rotates to a certain angle, the limiting plate 208 will disengage from the limiting groove on the top surface of the swing arm 201, thereby driving the second force storage module 207 to release its clamping.

[0112] The bottom end of the telescopic sleeve 209 is disposed in the outer spiral tube 206 . Specifically, a plurality of guide posts may be provided on the telescopic sleeve 209 for guiding the axial displacement of the inner spiral tube 210 .

[0113] One end of the inner coil 210 passes through the second power storage module 207 , and a sliding groove is provided on the outer wall of the inner coil 210 , through which the inner coil 210 is slidably mounted on the telescopic sleeve 209 , thereby forming a retractable structure with the telescopic sleeve 209 , saving space.

[0114] The drug dispensing process of the drug injection system provided in this embodiment also includes two processes: ratchet drive and retraction drive.

[0115] Ratchet drive: The drive module 202 operates, driving the swing arm 201 to rotate in the first direction. This, in turn, drives the ratchet 204, the outer screw 206, and the limiting plate 208 to rotate in the first direction through the push module 203. At this point, the limiting plate 208 slides out of the limiting slot on the swing arm 201, and the second force storage module 207 releases and holds the inner screw 210. At this point, the outer screw 206, the second force storage module 207, and the inner screw 210 are considered to be firmly connected. The inner screw 210 also rotates in the first direction. Since the plunger 211 is located within the liquid reservoir 212 and cannot rotate, the rotational motion of the inner screw 210 is converted into a linear stepping motion of the plunger 211. The inner screw 2111 rotates out, thereby driving the plunger 211 to axially move away from the outer screw 206, expelling the liquid from the liquid reservoir 212. At this point, the backstop module 205 passes over the ratchet 204, unrestricting its rotation.

[0116] During the retraction drive, the drive module 202 operates, driving the swing arm 201 to rotate in the second direction. Because the retraction stop module 205 abuts against the teeth of the ratchet 204 to prevent it from following the rotation, the swing arm 201 rotates relative to the outer screw 206. Due to the axial restraint between the swing arm 201 and the ratchet 204, the outer screw 206 rotates out, driving the axial displacement of the torsion spring, the inner screw 210, the inner screw 2111, and the plunger 211, thereby expelling the liquid from the liquid reservoir 212. At this point, the push module 203 slides off the surface of the ratchet 204. It is understood that this retraction process also drives drug infusion, eliminating idle travel and minimizing energy consumption.

[0117] In order to better understand the working process of the driving device 20, a specific embodiment is described below. As shown in Figures 3 and 4, in this embodiment, the two driving modules 202 are respectively the first driving wire 2021 and the second driving wire 2022, and the two pushing modules 203 are respectively the first pushing module 2031 and the second pushing module 2032, which are staggered at an angle of half a tooth. That is to say, when the first pushing module 2031 is located at the root of the ratchet 204, the second pushing module 2032 is located in the middle of the two teeth; the two stopping modules 205 are respectively the first stopping module 2031 and the second pushing module 2032. The retraction module 2051 and the second retraction prevention module 2052, like the pushing module 203, are also staggered by an angle of half a tooth. To ensure that each drive rotates half a tooth, two swing arm limit posts are provided at both ends of the swing arm 201. The first swing arm limit post and the second swing arm limit post are provided on the bottom plate. When the swing arm 201 rotates to the swing arm limit post at an angle of half a tooth, the swing arm 201 stops rotating. Specifically, a detection brush can be provided on the swing arm limit post. When the swing arm contacts the limit post, the brush is connected, and the power supply is stopped at this time, thereby stopping the swing arm from rotating. The working process of the driving device 20 of this embodiment is described below.

[0118] In the first stage, the first driving wire 2021 is energized, driving the swing arm 201 to rotate clockwise in the forward direction, the first pushing module 2031 pushes the ratchet 204 to rotate clockwise, and the outer screw 206 also rotates clockwise in the same direction, driving the limit plate 208 to rotate. When the limit plate 208 slides out of the upper limit slot of the swing arm 201, the second force storage module 207 releases and clamps the inner screw 210. At this time, the outer screw 206, the torsion spring and the inner screw 210 can be regarded as fixedly connected. When rotating clockwise, the inner screw is unscrewed, thereby driving the push plug 211 to axially displace and complete the injection.

[0119] In the second stage, the second drive wire 2022 is energized, driving the swing arm 201 to rotate counterclockwise in the forward direction, and the first anti-retraction module 2051 presses against the tooth surface of the ratchet 204 to prevent it from rotating. At this time, the swing arm 201 rotates relative to the outer screw tube 206. Due to the axial limitation of the swing arm 201 and the ratchet 204, the outer screw tube 206 is unscrewed, driving the torsion spring, inner screw tube 210, inner screw, and push plug 211 to axially move, completing the injection.

[0120] In the third stage, the first driving wire 2021 is energized, and the second pushing module 2032 pushes the ratchet 204 to rotate, completing one injection. This process is similar to the first stage and will not be described in detail.

[0121] In the fourth stage, the second driving wire 2022 is energized, and the second stop module 2052 is activated to complete a liquid injection. This process is similar to the second stage and will not be described in detail.

[0122] This cycle repeats itself. It is understandable that the first pushing module 203 and the second pushing module 203 need to rotate one tooth pitch alternately for the ratchet wheel 204 to rotate one tooth pitch.

[0123] It should be noted that the amount of liquid injected each time is determined by the upward displacement of the push plug 211. The upward displacement of the push plug 211 is related to the rotation angle of the swing arm 201, the number of teeth and rotation angle of the ratchet 204, the outer screw 206, the inner screw 210, and the thread spacing of the inner screw. For example, the more teeth the ratchet 204 has, the smaller the rotation angle generated each time, and the smaller and more accurate the dosage of medicine injected each time. Therefore, those skilled in the art can set the rotation angle of the swing arm 201, the number of teeth and rotation angle of the ratchet 204, the outer screw 206, the inner screw 210, and the thread spacing of the inner screw 2111 according to the needs of the amount of medicine injected each time.

[0124] In order to realize the knowledge of the liquid capacity of the liquid storage tank 212 during the injection and dispensing processes, as shown in Figures 3 and 5, the driving device 20 also includes a first step detection module, including a drug quantity detection piece 2131 and a first external brush 2132. One end of the drug quantity detection piece 2131 is fixed to the bottom of the ratchet 204 and connected to the first external brush 2132, and the other end is arranged on the inner wall of the outer screw tube 206. When the user does not inject the drug, the claw at the tail of the telescopic sleeve 209 and the slide groove of the inner screw tube 210 cooperate and buckle, and the head of the telescopic sleeve 209 is located inside the outer screw tube 206, playing a guiding role during the injection of the drug, preventing excessive radial runout during the injection. At this time, the fixed drug quantity detection piece 2131 is not conductive and there is no signal. During the injection process of the liquid storage tank 212, when the liquid in the liquid storage tank 212 increases, the plunger 211 drives the inner coil 210 to move axially along the telescopic sleeve 209 toward the outer coil 206. When the liquid increases to a preset volume, the head of the telescopic sleeve 209 stops moving downward under the action of the limit plate at the bottom of the outer coil 206, and the corresponding tail claw disengages from the buckle position and moves upward relative to the inner coil 210. The drug quantity detection piece 2131 contacts the inner coil 210, the circuit is turned on, and the system triggers the second storage module 207 to clamp the inner coil 210 according to the preset program; it should be noted that the preset volume here is the minimum capacity required for one injection, that is, the minimum injection amount; when the user injects the maximum amount of medicine, the claws of the telescopic sleeve 209 and the inner coil 210 are completely combined. During the drug dispensing process, when the liquid in the liquid storage tank 212 reaches the preset volume, an alarm will be triggered to prompt the user to replenish the liquid medicine; when the liquid in the liquid storage tank 212 is lower than the preset volume, the drug quantity detection piece 2131 will be separated from the contact with the inner spiral tube 210, and the circuit will be disconnected, informing the system of the remaining amount of medicine at this time, and prompting the user to replenish the liquid medicine.

[0125] The driving device 20 provided in this embodiment can also realize real-time injection amount detection. In some embodiments, the first step detection module also includes a detection resistor 2133 and a detection brush 2134; the detection resistor 2133 is a high-resistance resistor as a whole, fixed at the bottom of the ratchet 204, and electrically connected to the first external brush 2132. The detection brush 2134 is set at the bottom of the outer screw 206; when the ratchet 204 rotates and the outer screw 206 steps, the detection brush 2134 and the detection resistor 2133 form a loop and are connected to the first external brush 2132. Therefore, the resistance value will change each time the ratchet 204 rotates and the outer screw 206 steps, thereby obtaining the amount of each movement, and then converting it into real-time injection amount through the system chip.

[0126] In some embodiments, the driving device 20 may further include a second step detection module, as shown in Figure 6, specifically including a second external brush 2141 and a rotation detection piece 2142. The rotation detection piece 2142 can specifically be a metal cap with a notch, provided with multiple notches, and the notch positions are unevenly arranged, distributed in an increasing form or a large and small grid form, and can also be detected during reversal. The rotation detection piece 2142 is fixed to the bottom of the ratchet 204 and connected to the second external brush 2141. When the rotation detection piece 2142 rotates to the notch part, the circuit is disconnected. When it rotates to the non-notch metal part, it is connected to the second external brush 2141, thereby realizing rotation detection, and then converting it into real-time injection volume through the system chip.

[0127] In summary, compared with the prior art, the driving device provided in this embodiment no longer requires the use of motors, reducers, etc., which reduces manufacturing costs; it reduces the size and weight, making it easier to use and carry; due to the reduced size, more injection sites can be selected, such as the abdomen, limbs, etc., which can reduce the possibility of complications caused by always injecting the same site; and it eliminates the impact of noise, making the use process more comfortable, and the output more stable, direct, and reliable, which is conducive to accurately controlling the amount of insulin injected into the patient and ensuring the patient's health.

[0128] The above is an introduction to the structure and working process of the driving device 20. The liquid output from the liquid storage tank 212 will be injected into the subcutaneous tissue of the human body through the liquid-conducting tube 40 or through the hard needle through the needle-assisting device 30. The needle-assisting device 30 includes a track pressure plate 301, a soft needle slider 302, a hard needle slider 303, a second connecting rod 304, a first force storage module 305, a limiter 306 and a trigger assembly 307. The structure of each part of the needle-assisting device 30 is introduced below.

[0129] The track pressing plate 301 is fixed on the base plate 10 and is provided with a track for placing the hard needle slider 303 and the soft needle slider 302. The hard needle slider 303 and the soft needle slider 302 can slide along the track.

[0130] The needle slider 302 is used to secure the needle and is slidably mounted on the track of the track plate 301. To prevent the needle slider 302 from rebounding, a needle stopper is provided at the bottom of the track plate 301. When the needle slider 302 reaches the bottom of the track plate 301, the stopper prevents the slider 302 from resetting.

[0131] The hard needle slider 303 is slidably arranged on the track of the track pressure plate 301 and is connected to the other end of the second connecting rod 3042. It is driven by the second connecting rod 3042. The hard needle slider 303 is used to fix the hard needle. The hard needle can be connected to the liquid storage tank 212 through a catheter or directly.

[0132] The second connecting rod 304 includes a first connecting rod 3041 and a second connecting rod 3042 connected to each other. The first connecting rod 3041 and the second connecting rod 3042 form a linkage mechanism, that is, when the first connecting rod 3041 rotates, it will also drive the second connecting rod 3042 to rotate. The first connecting rod 3041 is connected to the hard needle slider 303 and is used to drive the hard needle slider 303 to move. The second connecting rod 3042 is connected to the first force storage module 305 via a pin. When the first force storage module 305 releases elastic potential energy, it drives the second connecting rod to rotate, thereby driving the hard needle slider 303 and the needle slider to move. It is understood that one end of the first force storage module 305 is fixed to the base plate 10 and is stationary. Its function is to trigger the rotation of the second connecting rod 304.

[0133] The limiting member 306 is fixed on the base plate 10 and is used to limit the movement of the first force storage module 305, the hard needle slider 303 or the second connecting rod 304, thereby keeping the first force storage module 305 in a compressed force storage state to store elastic potential energy.

[0134] The trigger assembly 307 includes a rotating shaft, a push rod 3071 and a trigger rod 3072. The rotating shaft is fixed on the base plate 10. The trigger rod 3072 and the push rod 3071 are fixed on the rotating shaft. One end of the trigger rod 3072 is limited by the limiting surface of the ratchet 204, and the other end is fixed on the base plate 10 and connected to one end of the push rod 3071. The push rod 3071 is arranged below the limiting member 306. It should be noted that in the initial state, the push rod 3071 lifts the limiting member 306. When the trigger rod 3072 rotates, it will drive the push rod 3071 to rotate. At this time, the limiting member 306 falls and no longer limits the movement of the hard needle slider 303 or the two-link rod.

[0135] Based on the understanding of the structure of the needle-assisting device 30 provided in this embodiment, its working process and principle are introduced below.

[0136] In the initial state, the limiting surface of the ratchet 204 limits the trigger rod 3072, the push rod 3071 lifts the limiting member 306, and the limiting member 306 limits the movement of the hard needle slider 303 or the second connecting rod, so that the first force storage module 305 remains in a compressed state.

[0137] When the driving device 20 is working, the ratchet 204 rotates. When the trigger rod 3072 passes the limiting surface of the ratchet 204, it drives the top rod 3071 to rotate, the limiting piece 306 falls, and the hard needle slider 303 or the second connecting rod disengages from the limit of the limiting piece 306. At this time, the first force storage module 305 is released, driving the second connecting rod 3042 to rotate, thereby driving the first connecting rod 3041 to rotate, and then driving the hard needle slider 303 and the soft needle slider 302 to move downward along the track of the track pressure plate 301. The hard needle and soft needle enter the user's subcutaneous tissue for injection, thereby completing the needle assist. After that, the soft needle slider 302 is limited at the bottom of the track pressure plate 301, and the soft needle remains in the subcutaneous tissue. The hard needle slider 303 rebounds and resets under the action of the first force storage module 305, driving the hard needle to reset. The needle-assisting device 30 of this embodiment assists the needle subcutaneously, the hard needle rebounds automatically, and the soft needle remains subcutaneously, which reduces the risk of infection and has good antibacterial and sealing properties; the soft needle is placed subcutaneously to inject the drug, which causes little pain and is convenient for the patient to move around, without worrying about the needle falling off; compared to an insulin injection pen, which requires at least 4 injections a day, the subcutaneous drug infusion device can be used for at least 3 days with one needle-assisting operation, which reduces the number of injections and causes less psychological and physical trauma to the patient.

[0138] It should be noted that the above-mentioned limit member 306 can be in various forms to achieve the movement limitation of the first force storage module 305, the hard needle slider 303 or the two-link rod. Those skilled in the art can set the structure of the limit member 306 as needed. The structure and function of the limit member 306 are explained below with three embodiments.

[0139] In some embodiments, in combination with Figures 7, 8 and 9, the needle-assisting device 30 and the driving device 20 are arranged horizontally, the limiting member can be a limiting plate 306, and the second connecting rod 3042 is provided with a slot adapted to the limiting plate 306. The movement of the second connecting rod 3042 is limited by the cooperation between the limiting plate 306 and the slot. Specifically, in the initial state, the limiting plate 306 is lifted by the push rod 3071, thereby engaging with the slot of the second connecting rod 3042, thereby suppressing the first force storage module 305 by limiting the second connecting rod 3042; when the trigger rod 3072 passes the limiting surface of the ratchet 204, driving the push rod 3071 to rotate, the limiting plate 306 falls and disengages from the second connecting rod 3042, and the movement of the second connecting rod 3042 is no longer restricted, thereby the first force storage module 305 disengages from the limit and is released, driving the second connecting rod 3042 and the first connecting rod 3041 to rotate, and then driving the hard needle slider 303 and the soft needle slider 302 to slide, completing the needle-assisting process.

[0140] In some embodiments, as shown in Figures 10 and 11 , the needle-assisting device 30 and the driving device 20 are arranged longitudinally, and the limiting member can be a first limiting rod 306. One end of the first limiting rod is fixed to the base plate 10 via a pin and can rotate about the pin. The first limiting rod limits the movement of the hard needle slider 303. Specifically, in the initial state, the other end of the first limiting rod is lifted by the push rod 3071, thereby abutting against the hard needle slider 303. This limits the position of the hard needle slider 303 and suppresses the first force storage module 305. When the trigger rod 3072 passes the limiting surface of the ratchet 204, it drives the push rod 3071 to rotate. At this time, the first limiting rod rotates, and the hard needle slider 303 is released from the limit of the first limiting rod. As a result, the first force storage module 305 is released from the limit and drives the second connecting rod 3042 and the first connecting rod 3041 to rotate, which in turn drives the hard needle slider 303 and the soft needle slider 302 to slide, completing the needle-assisting process.

[0141] In some embodiments, in combination with what is shown in FIG12 , the needle-assisting device 30 and the driving device 20 are longitudinally arranged, and the limiting member may include a second limiting rod 306 and a limiting pressure plate 3061. One end of the second limiting rod is fixed to the base plate 10 through a pin shaft, and one end of the limiting pressure plate is fixed to the track pressure plate 301. A limiting groove is provided on the limiting pressure plate, and the limiting groove is used to limit the movement of the hard needle slider 303. Specifically, in the initial state, the other end of the second limiting rod is lifted by the push rod 3071, thereby abutting against the limiting pressure plate. At this time, the limiting groove limits the hard needle slider 303, and the hard needle slider 303 cannot move, thereby achieving the suppression of the first force storage module 305 by limiting the hard needle slider 303; when the trigger rod 3072 passes the limiting surface of the ratchet 204, driving the push rod 3071 to rotate, the second limiting rod rotates at this time, and the limiting pressure plate is disengaged from the contact with the hard needle slider 303, thereby the first force storage module 305 is disengaged from the limit and released, driving the second connecting rod 3042 and the first connecting rod 3041 to rotate, and then driving the hard needle slider 303 and the soft needle slider 302 to slide, completing the needle-assisting process.

[0142] In some embodiments, as shown in Figure 13, the needle-assisting device 30 and the driving device 20 are arranged longitudinally, including a limiting plate 306, one end of which is fixed on the base plate 10, and the trigger rod 307 is constrained on the base plate 10. A limiting groove is provided on the limiting plate, and the limiting groove is used to limit the movement of the hard needle slider 303. Specifically, in the initial state, one end of the trigger rod 307 is against the limiting groove, and the other end is limited by the ratchet. At this time, the limiting groove limits the hard needle slider 303, and the hard needle slider 303 cannot move. The first force storage module 305 is suppressed by limiting the hard needle slider 303; when the other end of the trigger rod passes over the limiting surface of the ratchet 204 and rotates, the limiting groove is disengaged from the contact with the hard needle slider 303, and the first force storage module 305 is disengaged from the limit and released, driving the second connecting rod 3042 and the first connecting rod 3041 to rotate, and then driving the hard needle slider 303 and the soft needle slider 302 to slide, completing the needle-assisting process.

[0143] It can be understood that when the drug injection system provided in this embodiment is working, the liquid storage tank is first injected with liquid medicine, and then the driving device works to expel the air in the catheter. After a period of time, the needle removal module is triggered to complete the needle assistance, and then the driving device continues to work to complete the injection through the catheter.

[0144] The drug injection system provided in this embodiment adopts a driving mode in which a ratchet screw cooperates with each other, has a high degree of integration, reduces manufacturing costs and energy consumption, reduces weight, and is easy to use and carry; adopts a drug injection detection module, and the output is more stable, direct, and reliable, which is conducive to precise control of the patient's drug injection volume; the needle-assisting device assists the needle subcutaneously, the hard needle automatically rebounds, and the soft needle remains subcutaneously, which reduces the number of needle punctures, reduces the risk of infection, and has good antibacterial and sealing properties.

[0145] In this application, the term "plurality" refers to two or more, unless expressly limited otherwise. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0146] In the description of this application, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0147] Throughout this specification, terms such as "a specific embodiment," "some embodiments," or "an embodiment" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic 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 any one or more embodiments or examples.

[0148] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of this application. It should be understood that the above description is only the specific implementation methods of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A drug infusion system, wherein: The drug injection system comprises a base plate, a driving device and a needle-assisting device, wherein the base plate is used to fix the driving device and the needle-assisting device, wherein: The driving device comprises a driving module, a pushing mechanism, a rotating wheel, a first threaded rod, a second threaded rod and a propulsion module; wherein, The driving module is used to drive the pushing mechanism to rotate along the first direction and the second direction; the pushing mechanism is provided with threads, The rotating wheel is driven to rotate by the driving module to realize rotation in a first direction; The first threaded rod can rotate synchronously with the rotating wheel and / or move axially relative to the rotating wheel, and is screwed with the thread of the pushing module and the thread of the second threaded rod; the second threaded rod is fixedly connected to the push plug, The propulsion module includes a push plug and a fluid storage tank; The liquid storage tank is fixed on the bottom plate and is used for storing liquid.

2. The drug infusion system according to claim 1, wherein: The drug injection system driving working process includes: When the pushing mechanism rotates in the first direction, the pushing mechanism drives the rotating wheel to rotate synchronously in the first direction, and the first threaded rod rotates synchronously with the rotating wheel and rotates relative to the second threaded rod. At this time, the second threaded rod produces axial displacement relative to the first threaded rod, pushing the plunger to move. Then, when the pushing mechanism rotates in the second direction, the rotating wheel does not rotate, the first threaded rod does not rotate, and the first threaded rod produces axial displacement relative to the pushing mechanism, driving the second screw rod to synchronously displace, pushing the plunger to move: The first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction.

3. The driving device according to claim 1, wherein: The pushing mechanism includes a swing arm, a pushing module, and a stop module, wherein the pushing module is connected to the swing arm, and the pushing module drives the swing arm to rotate along the first direction and the second direction. The pushing module pushes the rotating wheel to rotate in the same direction along a first direction, and the anti-retraction module acts on the rotating wheel to control the unidirectional rotation of the rotating wheel. Preferably, the rotating wheel is a ratchet wheel.

4. The driving device according to claim 3, wherein: The first threaded rod is an external screw tube, which is arranged in the rotating wheel and can rotate synchronously with the rotating wheel and / or For the axial displacement of the rotating wheel, the outer wall of the first threaded rod is provided with a thread, which is screwed to the screw hole of the swing arm, and the inner wall of the first threaded rod is provided with an internal thread, which is screwed to the second threaded rod. Preferably, one end of the push plug is provided with an external screw, and the external screw is threadedly connected to the inner wall of the first threaded rod; The liquid storage tank is sleeved on the outer side of the push plug to limit the rotation of the push plug.

5. The drug infusion system according to claim 3, wherein: The first threaded rod includes an outer spiral tube, an inner spiral tube, a second force storage module, a limit plate and a telescopic sleeve; The inner spiral tube has a threaded inner wall and can be connected to the outer spiral tube. One end of the inner spiral tube is provided with the second power storage module. The outer wall of the inner spiral tube is provided with a sliding groove, and the inner spiral tube is slidably mounted on the telescopic sleeve through the sliding groove. A torsion spring limiting area is provided at the top of the inner wall of the outer spiral tube; The second force storage module is arranged in the torsion spring limiting area of ​​the outer spiral tube; The limiting piece is connected to the second force storage module, the limiting piece is fixed on the top surface of the outer spiral tube, and is clamped in the limiting groove on the top surface of the swing arm. The second force storage module is limited to the telescopic sleeve of the outer spiral tube through the limiting piece, and one end is arranged in the outer spiral tube, which is used to guide the axial displacement of the inner spiral tube; The outer portion of the outer spiral tube is provided with a thread which is threadedly connected with the thread of the pushing module.

6. The drug injection system according to any one of claims 1 to 5, wherein: The needle-assisting device comprises a track pressing plate, a soft needle slider, a hard needle slider, two connecting rods, a first force storage module, a limiter and a trigger rod; The track pressing plate is fixed on the bottom plate; The soft needle slider is used to fix the soft needle and is arranged on the track of the track pressure plate; The hard needle slider is arranged on the track of the track pressure plate and above the soft needle slider, and is used to fix the hard needle, and the hard needle is connected to the liquid storage tank; The two connecting rods include a first connecting rod and a second connecting rod, wherein the first connecting rod is connected to the hard needle slider, and the second connecting rod is connected to the first force storage module through a pin shaft, and is used to drive the two connecting rods to rotate when the first force storage module releases elastic potential energy; The limiting member is fixed on the bottom plate and is used to limit the movement of the first force storage module, the hard needle slider or the two connecting rods, thereby keeping the first force storage module in a compressed state; The trigger rod is constrained on the bottom plate, one end of the trigger rod is limited by the limiting surface of the rotating wheel, and the other end of the trigger rod limits the limiting member.

7. The drug infusion system according to claim 4 or 5, wherein: The drug dispensing process of the drug injection system includes: Rotary wheel drive: the driving module works, the rotary wheel is a ratchet wheel, driving the swing arm to rotate in the first direction, and the ratchet wheel, the outer screw tube and the limit plate are driven to rotate in the first direction through the pushing module. At this time, the limit plate slides out of the limit groove, and the second power storage module releases and holds the inner screw tube tightly, and the inner screw tube rotates in the first direction. Due to the rotation limit of the push plug, the inner screw is rotated out, thereby driving the push plug to move axially and press out the liquid in the liquid storage tank; Retraction drive: the driving module works to drive the swing arm to rotate in the second direction, and the anti-retraction module presses against the ratchet tooth surface to prevent it from rotating. Due to the axial limitation of the swing arm and the ratchet, the outer screw is screwed out, driving the torsion spring, the inner screw, the inner screw and the push plug to axially move, thereby pressing out the liquid in the liquid storage tank.

8. The drug infusion system according to claim 4 or 5, wherein: The driving device further comprises a first step detection module, comprising a drug quantity detection sheet and a first external brush, wherein one end of the drug quantity detection sheet is fixed to the bottom of the rotating wheel and connected to the first external brush, and the other end is arranged on the inner wall of the outer spiral tube; During the process of injecting medicine into the liquid storage tank, when the liquid in the liquid storage tank increases, the push plug drives the inner spiral tube to move axially toward the outer spiral tube. When the liquid increases to a preset volume, the medicine amount detection sheet contacts the inner spiral tube, the circuit is turned on, and the system determines that the second power storage module can be triggered to hold the inner spiral tube tightly. During the drug dispensing process, when the liquid in the liquid storage tank is lower than the preset volume, the drug quantity detection sheet is separated from the contact with the inner spiral tube, and the circuit is disconnected at this time.

9. The drug infusion system according to claim 8, wherein: The first step detection module also includes a detection resistor and a detection brush; the detection resistor is fixed at the bottom of the rotating wheel and is electrically connected to the first external brush, and the detection brush is arranged at the bottom of the external spiral tube; When the wheel rotates and the outer solenoid moves in steps, the detection brush and the detection resistor form a loop and are connected to the first external brush, so that the resistance value changes each time the wheel rotates and the outer solenoid moves in steps, thereby detecting the amount of each movement.

10. The drug injection system according to any one of claims 1 to 6, wherein: The driving device also includes a second step detection module, including a second external brush and a rotation detection piece. The rotation detection piece is provided with a plurality of notches, fixed at the bottom of the rotating wheel, and connected to the second external brush. When the rotation detection piece rotates to a notch, the circuit is disconnected. When the rotation detection piece rotates to a non-notch, the circuit is connected to the second external brush, thereby realizing rotation detection.

11. The drug infusion system according to claim 6, wherein: The needle-assisting process of the drug injection system includes: In the initial state, the limit surface of the rotating wheel limits the trigger rod, the trigger rod lifts the limit part, and the limit part limits the movement of the hard needle slider or the second connecting rod, so that the first force storage module remains in a compressed state; when the rotating wheel rotates, the trigger rod passes over the limit surface of the rotating wheel and rotates, the limit part falls, and the hard needle slider or the second connecting rod is disengaged from the limit of the limit part. At this time, the first force storage module is released, driving the second connecting rod and the first connecting rod to rotate, thereby driving the hard needle slider and the soft needle slider to move downward along the track of the track pressure plate, thereby completing the needle assist, and thereafter the soft needle slider is limited at the bottom of the track pressure plate, and the hard needle slider is reset.

12. The drug infusion system according to claim 6, characterized in that: The needle-assisting device comprises a push rod, the limiting member is a limiting plate, and the second connecting rod is provided with a slot adapted to the limiting plate; In the initial state, the limiting plate is lifted up by the push rod, so as to engage with the clamping groove of the second connecting rod, thereby suppressing the first power storage module by limiting the position of the second connecting rod; When the trigger rod passes over the limiting surface of the rotating wheel, it drives the top rod to rotate. At this time, the limiting piece falls and disengages from the second connecting rod, so that the first power storage module is released from the limiting surface, driving the second connecting rod and the first connecting rod to rotate.

13. The drug infusion system according to claim 6, characterized in that: The needle-assisting device includes a push rod, and the limiting member is a first limit rod, one end of which is fixed to the bottom plate by a pin shaft. In the initial state, the other end of the first limit rod is lifted by the push rod, thereby abutting against the hard needle slider, thereby achieving the suppression of the first force storage module by limiting the hard needle slider; When the push rod passes over the limiting surface of the rotating wheel and rotates, the first limiting rod rotates, and the hard needle slider is disengaged from the limiting position of the first limiting rod, thereby the first force storage module is disengaged from the limiting position and released, driving the second connecting rod and the first connecting rod to rotate.

14. The drug infusion system according to claim 6, characterized in that: The needle assisting device comprises a push rod, and the limiting member comprises a second limiting rod and a limiting pressing plate, one end of the second limiting rod is fixed to the bottom plate through a pin shaft, and one end of the limiting pressing plate is fixed to the track pressing plate and is provided with a limiting groove; In the initial state, the other end of the second limiting rod is lifted by the push rod, thereby abutting against the limiting pressure plate. At this time, the limiting groove limits the hard needle slider, thereby suppressing the first power storage module by limiting the hard needle slider; When the trigger rod passes over the limiting surface of the rotating wheel, it drives the push rod to rotate. At this time, the second limiting rod rotates, and the limiting pressure plate is separated from the contact with the hard needle slider. As a result, the first force storage module is separated from the limit and released, driving the second connecting rod and the first connecting rod to rotate.

Images