CN117085200A - Medicine injection equipment - Google Patents

Abstract

The embodiment of the invention relates to a drug injection device, which comprises a shell, a driving device and a needle injection device, wherein the shell is used for fixing the driving device and the needle injection device, and the driving device comprises a swinging module, a driving module, a stopping module and a pushing module; the needle injection device comprises a soft needle sliding block, a force storage element, a hard needle sliding block, an energy storage element, a slideway slot, a stop rod, a pushing element, a limiting pin and a triggering element; the equipment integrates the driving module and the automatic needle injection module which are matched with each other, reduces the manufacturing cost and the energy consumption, lightens the weight and is convenient to use and carry; the output is more stable, direct and reliable, and the accurate control of the injection quantity of the liquid medicine of a patient is facilitated; the injection needle device injects the needle downwards, the hard needle automatically rebounds, the soft needle is reserved under the skin, the needle inserting times are reduced, the infection risk is reduced, and the antibacterial property and the sealing property are good.

Description

Medicine injection equipment

Technical Field

The invention relates to the field of medical treatment, in particular to a drug injection device.

Background

The patch type drug delivery device is a medical instrument device for realizing the treatment of the disease of a patient by continuously injecting drugs into the patient. The device is widely used for treating diabetes mellitus, the application type insulin pump system is equipment for infusion of insulin by diabetics, and compared with a traditional insulin pump, the application type insulin pump has no pipeline, can be worn on the body, and can continuously deliver basic insulin and large-dose insulin within two to three days.

The existing pasting type drug delivery device is large in size and inconvenient to carry, and a user cannot accurately control the injection metering of the liquid medicine, so that great trouble is brought to the user.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the drug injection equipment, which integrates a driving module and an automatic needle injection module which are mutually matched with a ratchet screw, reduces the manufacturing cost and energy consumption, lightens the weight and is convenient to use and carry; the output is more stable, direct and reliable, and the accurate control of the injection quantity of the liquid medicine of a patient is facilitated; the injection needle device injects the needle downwards, the hard needle automatically rebounds, the soft needle is reserved under the skin, the needle inserting times are reduced, the infection risk is reduced, and the antibacterial property and the sealing property are good.

In view of this, an embodiment of the present invention provides a drug injection device including: the device comprises a shell, a driving device and a needle injection device, wherein the shell is used for fixing the driving device and the needle injection device,

the driving device comprises a swinging module, a driving module, a backstop module and a propulsion module; wherein,

the swing module comprises two swing arms, a center arm, an end cover and a pushing piece; wherein, the two ends of the center arm are respectively connected with the two swing arms; the end cover is provided with a threaded hole, and both ends of the end cover are provided with sliding arms which are respectively arranged on the two swing arms in a sliding way, so that the swing arms and the end cover are buckled; the pushing piece is fixed on the swing arm;

the driving module comprises a driving screw and a driving wheel; the inner wall and the outer wall of the driving screw are provided with threads, one end of the driving screw is arranged in the end cover and is in threaded connection with the threaded hole of the end cover, and the outer wall of the driving screw is also provided with a groove; the driving wheel comprises a first ratchet wheel and a second ratchet wheel, the driving wheel is driven by the pushing piece and sleeved on the driving screw, a bulge matched with the groove of the driving screw is arranged in the middle of the driving wheel and used for limiting radial runout of the driving screw and realizing synchronous rotation of the driving screw and the driving wheel, and the driving screw can axially slide along the driving wheel; the driving wheel is provided with a notch;

the backstop module is fixed on the shell and used for limiting the unidirectional rotation of the driving wheel;

the propulsion module comprises a plunger and a liquid storage tank; wherein, one end of the plunger is provided with an inner screw rod which is in threaded connection with the inner wall of the driving screw rod; the liquid storage tank is used for storing liquid, is fixed on the shell, is sleeved on the outer side of the plunger and is used for limiting the rotation of the plunger;

the needle injection device comprises a soft needle sliding block, a force storage element, a hard needle sliding block, an energy storage element, a slideway slot, a stop rod, a pushing element, a limiting pin and a triggering element; wherein,

the soft needle sliding block is used for fixing the soft needle, an opening is formed in the bottom of the soft needle sliding block, and the force storage element is arranged in the soft needle sliding block; the hard needle sliding block is used for fixing a hard needle, an opening is formed in the bottom of the hard needle sliding block, the hard needle sliding block is arranged in the energy storage element, and the energy storage element is arranged in the force storage element;

the slideway groove is arranged between the driving device and the needle injection device and is provided with a first limit opening and a second limit opening;

one end of the stop rod is propped against the driving wheel, and the other end of the stop rod penetrates through the first limit opening of the slideway slot and is arranged in the opening at the bottom of the soft needle sliding block;

the pushing element is sleeved on the stop rod;

one end of the limiting pin penetrates through the soft needle sliding block and is arranged in the opening at the bottom of the hard needle sliding block, and the other end of the limiting pin abuts against the slideway slot;

the trigger element is sleeved on the limiting pin.

Preferably, the front end of the driving wheel is provided with two limiting pieces matched with the grooves of the driving screw, and the driving wheel and the driving screw synchronously rotate through the protruding part on the inner wall of the driving wheel and the front end limiting piece.

Preferably, the casing is provided with a plurality of fixing columns, and the fixing columns are respectively fixed at the front end of the driving wheel through fixing seats and used for limiting the radial runout and the axial movement of the driving wheel.

Further preferably, the driving wheel further comprises a convex ring arranged between the first ratchet wheel and the second ratchet wheel, and the fixing seat is arranged at the upper end and the lower end of the convex ring, so that the driving wheel is axially limited; the notch is arranged on the convex ring.

Preferably, the driving device working process includes:

driving the driving wheel: under the action of a first power source, the swing module rotates along a first direction to drive the end cover and the pushing piece to move, so that the first ratchet wheel is driven to rotate by a half of a tooth angle along the first direction to drive the driving wheel and the driving screw to rotate, and the rotation movement is converted into linear stepping movement of the inner screw to drive the pushing plug to axially move in a direction far away from the driving screw due to the limit of the rotation of the pushing plug, so that the liquid medicine infusion is pushed;

rollback driving: under the action of a second power source, the swing module rotates along a second direction to drive the end cover and the pushing piece to move, the pushing piece slides back from the driving wheel, at the moment, the second ratchet wheel generates a rotation trend along the second direction, and the retaining piece carries out unidirectional rotation limiting on the second ratchet wheel; because the end cover rotates, the driving screw rod generates relative rotation and moves in the direction away from the end cover, the pushing plug is driven to move in the direction away from the end cover and axially move, and the liquid medicine is pushed to be infused.

Further preferably, the power source is a driving wire, and the driving wire is connected with the swing arm and is electrified to shrink so as to drive the swing arm to rotate.

Preferably, the driving device further comprises a limiting column arranged on two sides of the two swing arms and used for limiting the rotation angle of each swing arm to be half of teeth.

Preferably, the needle injection device further comprises two sliding rails fixed in the shell; the soft needle sliding block is arranged between the two sliding rails in a sliding way.

Preferably, the hard needle passes through the hard needle sliding block, the energy storage element, the force storage element and the soft needle sliding block, is fixed inside the hard needle sliding block, one end of the hard needle sliding block is sleeved with the soft needle, and the other end of the hard needle sliding block is arranged in the medicine inlet of the medicine storage tank.

Preferably, the working process of the needle injection device comprises the following steps:

initial state: one end of the stop rod is propped against the driving wheel, and the other end of the stop rod limits the soft needle sliding block, so that the pushing element is in a compressed state; one end of the limiting pin is propped against the slideway slot, and the other end limits the hard needle sliding block, so that the trigger element is in a compressed state; the energy storage element and the force storage element are in a compressed state;

soft needle insertion: when the driving wheel rotates to the notch position, the stop rod horizontally moves away from the soft needle sliding block under the action of the elastic force of the pushing element, and is separated from the soft needle sliding block and the slideway groove, so that the limit on the soft needle sliding block is lost, the soft needle sliding block moves downwards under the action of the elastic force of the force storage element, the hard needle sliding block and the energy storage element also move downwards at the same time, and the hard needle and the soft needle are implanted into the skin of a human body at the same time;

hard needle retraction: when the limiting pin moves to the second limiting opening of the slideway slot, the limiting pin moves horizontally in the direction away from the hard needle sliding block under the action of the elastic force of the triggering element, the limiting effect on the hard needle sliding block is lost, so that the hard needle sliding block moves upwards under the action of the elastic force of the energy storage element, the hard needle is pulled to retract, the soft needle is separated from the skin of a human body, and the soft needle is left under the skin;

end state: the soft needle is placed under the skin, the soft needle sliding block is positioned at the lower part, the energy storage element is positioned at the release state, the hard needle and the hard needle sliding block are retracted to the upper part, and the energy storage element is positioned at the release state.

Compared with the prior art, the invention has the advantages and positive effects that:

1. the embodiment of the invention provides a medicine injection device which adopts a driving mode of mutually matching a double ratchet wheel and a screw, has high integration level, reduces manufacturing cost and energy consumption, lightens weight and is convenient to use and carry; the influence of noise is eliminated, and the use process is more comfortable;

2. the embodiment of the invention provides a drug injection device which adopts a swinging module and an end cover, is contractible, has a small volume, can select more injection sites, such as abdomen, limbs and the like, so as to reduce multiple injections to the same site;

3. the embodiment of the invention provides the drug injection device, which adopts the limit column, and the swing arm rotates for half the angle of the teeth each time, so that the output is more stable, direct and reliable, and the accurate control of the injection quantity of the drug liquid of a patient is facilitated;

4. the embodiment of the invention provides a needle injection device of a drug injection device, which injects a needle into the skin, a hard needle automatically rebounds, a soft needle is reserved under the skin, the needle insertion times are reduced, the infection risk is reduced, and the drug injection device has good antibacterial property and sealing property.

Drawings

Fig. 1 is a schematic structural diagram of a drug infusion device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a driving device according to an embodiment of the present invention;

FIG. 3 is an exploded view of a driving device and a housing according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a driving wheel according to an embodiment of the present invention;

FIG. 5 is an exploded view of a needle injection device according to an embodiment of the present invention;

fig. 6 is a sectional view showing an initial state of a drug injection device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an initial device state of soft needle insertion according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a state of a soft needle insertion ending device according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a device state after a hard needle is retracted according to an embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Fig. 1 is a schematic structural view of a drug injection device according to an embodiment of the present invention, fig. 2 is a schematic structural view of a driving device according to an embodiment of the present invention, fig. 3 is an exploded schematic view of a driving device and a housing according to an embodiment of the present invention, and, with reference to fig. 1 and 3, the drug injection device according to the embodiment includes a housing 10, a driving device 20 and a needle injection device 30, and the following description will describe each component of the device.

A housing 10 for fixing the driving device 20 and the needle device 30.

The driving device 20 specifically comprises a swinging module, a driving module, a stopping module and a propelling module. The structure of each part of the driving device 20 will be described in detail.

The swing module 201 is used for receiving a power source to generate swing so as to drive the pushing piece 203, and specifically comprises two swing arms 2011, a center arm 2012, an end cover 202 and the pushing piece 203.

Specifically, two ends of the center arm 2012 are respectively connected with two swing arms 2011, which may be integrally connected, and the two swing arms 2011 are specifically a first swing arm and a second swing arm. The power source includes, but is not limited to, electromagnetic driving and driving wires, in a specific example, the power source is two driving wires, which are respectively connected with two swing arms 2011, the driving wires are electrified to shrink to drive the swing arms to rotate, specifically, the first driving wire is connected with the first swing arm, the second driving wire is connected with the second swing arm, when the first driving wire is electrified, heat is generated to shrink to drive the first swing arm to move downwards, and the second swing arm moves upwards to generate rotary motion, and when the second driving wire is electrified, rotary motion in the opposite direction is generated.

The pushing members 203, specifically including the first pushing member and the second pushing member, may be metal sheets, and are used to drive the driving wheel 205 to rotate, and are fixed on the swing module 201, so that for convenience in installation, the two pushing members 203 are preferably integrated into a double-pulling-piece structure and are fixed on one swing arm 2011, and thus when the swing arm 2011 rotates, the swing arm 2011 will drive the pushing member 203 to rotate.

An end cover 202, provided with a threaded hole in the middle, for being matched with a driving screw 204; the two ends of the end cover 202 are provided with sliding arms which are matched with the swing arms 2011 and are respectively arranged on the two swing arms 2011 in a sliding way, so that the buckling of the swing module 201 and the end cover 202 is realized. It should be noted that, the swing arm 2011 and the end cover 202 slide relatively in the process of injecting medicine into the medicine storage tank, and are fixedly connected after completion, and are fixedly connected in the process of injecting medicine into the human body.

The drive module comprises a drive screw 204 and a drive wheel 205.

Specifically, the driving screw 204 is provided with threads on the inner wall and the outer wall, one end of the driving screw 204 is disposed in the end cover 202, the threads on the outer wall are screwed with the threaded holes of the end cover 202, the other end of the driving screw 204 is disposed in the through hole of the center arm 2012, and further, a groove is further formed on the outer wall of the driving screw 204.

The driving wheel 205, as shown in fig. 4, comprises a first ratchet 2051 and a second ratchet 2052, the teeth of the two ratchet wheels are the same, the two ratchet wheels are driven by two pushing members 203 respectively, the pushing members 203 can drive the driving wheel 205 to rotate when rotating, specifically speaking, when the first pushing member 203 is located at the tooth root of the first ratchet 2051, the second pushing member 203 is just located at the middle of the tooth of the second ratchet 2052 to cover half of the gear, and it can be understood that the scheme for realizing the above effect can be that the two gears are staggered, the angles of half of the teeth are staggered, or the two gears are synchronously arranged, and the two pushing members 203 are staggered, so as to realize the above effect. Further, the driving wheel 205 is sleeved on the driving screw 204, a protrusion matched with the groove of the driving screw 204 is arranged on the inner wall in the middle of the driving wheel 205, and the groove and the protrusion are matched with each other and used for limiting the radial runout of the driving screw 204 and realizing the synchronous rotation of the driving screw 204 and the driving wheel 205; the drive wheel 205 is provided with a notch, preferably at the junction of the two ratchet wheels, for triggering the operation of the needle injection device 30.

In some preferred embodiments, the front end of the driving wheel 205 is provided with two limiting pieces 2053 that are matched with grooves of the driving screw 204, the limiting pieces 2053 and protrusions on the inner wall of the driving wheel 205 and the limiting pieces 2053 may be integrally designed, and the driving wheel 205 and the driving screw can synchronously rotate through the protruding portion on the inner wall of the driving wheel 205 and the front end limiting pieces 2053.

In some preferred embodiments, in order to ensure stability during operation of the driving device 20, a plurality of fixing columns 101 are provided on the housing 10, and are respectively fixed at front ends of the bottom of the driving wheel 205 and the center arm 2012 by fixing seats 102, for limiting radial runout of the driving wheel 205 and the center arm 2012, specifically, fixing seats 102 are provided at left and right ends of a connection portion between the first ratchet wheel 2051 and the second ratchet wheel 2052, and fixing columns 101 are provided on the fixing seats 102, so that radial limiting and axial limiting are performed on the driving wheel 205 by the fixing columns 101 and the fixing seats 102, further, the number of the fixing seats 102 is two, one is arranged at the lower portion of the first ratchet wheel 2051, and one is arranged at the upper portion of the second ratchet wheel 2052, so that axial limiting is performed on the driving wheel 205. And, also be equipped with fixing base 102 in the bottom both sides of center arm 2012, be equipped with fixed column 101 on the fixing base 102 to carry out radial spacing to center arm 2012 through fixed column 101 and fixing base 102.

In a more preferred embodiment, the driving wheel 205 further includes a convex ring 2054 disposed between the first ratchet 2051 and the second ratchet 2052, and the two fixing bases 102 are respectively disposed at the upper end and the lower end of the convex ring 2054, so as to axially limit the driving wheel 205; the male ring 2054 is provided with a notch that mates with the needle device 30 for triggering the needle device 30.

The thrust module 206, which may be specifically two thrust pieces, is fixed on the housing 10, similar to the pushing piece 203, and specifically includes a first thrust piece and a second thrust piece, for limiting unidirectional rotation of the driving wheel 205; the two stop tabs are preferably of an integrated double tab construction and are secured to the housing 10. It will be appreciated that the two stop tabs are in contact with the two ratchet wheels respectively, and that when the first stop tab is at the root of the first ratchet wheel 2051, the second stop tab is just at the middle of the tooth of the second ratchet wheel 2052, thereby limiting unidirectional rotation of the drive wheel 205.

The propulsion module includes a plunger 207 and a reservoir 208.

Specifically, the plunger 207 is disposed in the liquid storage tank 208, and is configured to press out the liquid in the liquid storage tank 208, and an inner screw 2071 is disposed at one end, where the inner screw 2071 is screwed to the thread on the inner wall of the driving screw 204, so that the inner screw 2071 can be screwed out from the driving screw 204 to drive the plunger 207 to axially displace. Preferably, a rubber seal 2072 is provided at the front of the plunger 207 to seal the liquid in the reservoir 208.

The liquid storage tank 208 is fixed on the shell 10 and is used for storing liquid, is sleeved outside the plunger 207, and is used for limiting the rotation of the plunger 207, so that the plunger 207 can axially move in the liquid storage tank 208 to realize liquid injection and liquid output. It should be noted that the liquid stored in the liquid storage tank 208 may be selected by those skilled in the art as required, and the liquid includes, but is not limited to, insulin, glucagon, antibiotics, nutrient solution, analgesic, morphine, anticoagulant, gene therapy drug, cardiovascular drug, chemotherapy drug, etc.

With the understanding of the structure of the driving device 20 provided in this embodiment, the operation and principle thereof will be described with reference to fig. 1 to 4.

The medicine discharging process of the medicine injection device provided by the embodiment comprises driving wheel driving and back driving.

Driving the driving wheel: under the action of a first power source, the swing module 201 rotates along a first direction to drive the end cover 202 and the first pushing piece 203 to move, so that the first ratchet 2051 is driven to rotate by half a tooth angle along the first direction to drive the driving wheel 205 and the driving screw 204 to rotate, and the inner screw on the plunger 207 generates relative rotation along with the rotation, and the plunger 207 is arranged in the liquid storage tank 208 and is limited in rotation and cannot rotate, so that the rotation is converted into linear stepping motion of the inner screw 2071 to drive the plunger 207 to axially move in a direction far away from the driving screw 204 to push the liquid medicine to be infused; at this time, the two stop tabs 206 are slid over the two ratchets, and there is no restriction on the ratchet rotation.

Rollback driving: under the action of a second power source, the swing module 201 rotates along a second direction to drive the end cover 202 and the pushing piece 203 to move, the pushing piece 203 slides back from the driving wheel 205, at this time, the second ratchet 2052 generates a rotation trend along the second direction, and the retaining piece 206 carries out unidirectional rotation limit on the driving wheel 205, so that the rotation of the driving wheel 205 is limited; because the end cover 202 rotates by half a tooth angle, the driving screw 204 rotates relatively, moves in a direction away from the end cover 202, drives the plunger 207 to move axially in a direction away from the end cover 202, and pushes the liquid medicine to be infused. At this time, the pusher 203 slides back from the ratchet surface. It can be appreciated that the drug infusion is also driven during this retraction process, with no idle stroke and low structural energy consumption.

It should be noted that, during the driving and retracting driving processes, the driving wheel 205 does not move axially, so that radial runout of the ratchet wheel is avoided, and further, the structural stability is more reliable and the structural precision is higher due to the reduction of moving parts.

In order to ensure that the driving device 20 rotates one half tooth at a time, the driving device further comprises two limiting posts arranged on two sides of the two swing arms 2011, wherein the angle for limiting each rotation of the swing arms 2011 is one half tooth, the angle from the swing arms 2011 to the limiting posts is one half tooth, and the swing arms 2011 rotate to the limiting posts to stop rotating.

The first direction may be a clockwise direction or a counterclockwise direction, and may be set by a person skilled in the art according to needs, and the first power source includes but is not limited to a first driving wire, and the second power source includes but is not limited to a second driving wire.

It will be appreciated that the driving process of the driving device 20 may be divided into four stages according to the working pusher 203 and the stop 206: in the first driving wheel driving stage, the first pushing member 203 pushes the first ratchet 2051 to work; in the second retraction driving stage, the second ratchet 2052 is stopped by the second stopping piece 206 to work; a third driving wheel driving stage, in which the second pusher 203 pushes the second ratchet 2052 to work; in the fourth retraction drive phase, the first stop tab 206 stops the first ratchet 2051 from operating. As such, and as will be appreciated, rotation of the drive wheel 205 by one pitch requires alternating of the first 203 and second 203 pushers.

It should be noted that, the amount of injection at each time is determined by the upward displacement of the plunger 207, and the upward displacement of the plunger 207 is related to the rotation angle, the number of ratchet teeth and the rotation angle of the swing arm 2011, the driving screw 204, and the pitch of the internal screw threads, for example, the more the number of ratchet teeth is, the smaller the rotation angle at each time is, the more accurate the amount of injection at each time is, so those skilled in the art can set the rotation angle, the number of ratchet teeth and the rotation angle of the swing arm 2011, the driving screw 204, and the pitch of the internal screw threads according to the requirement of the amount of injection at each time.

The structure and operation of the driving device 20 are described above, and the liquid output from the liquid storage tank 208 is injected into subcutaneous tissue of a human body through the needle injection device 30, and as shown in fig. 5, the needle injection device 30 includes a soft needle slider 301, a force storage element 302, a hard needle slider 303, an energy storage element 304, a slideway 305, a stop rod 306, a pushing element 307, a stop pin 308 and a trigger element 309, and the structure of each part of the needle injection device 30 is described below.

The soft needle slide block 301 is used for fixing the soft needle 3010, a first opening is formed in the bottom of the soft needle slide block, the soft needle slide block 301 is used for fixing the stop rod 306, and a second opening is formed in the soft needle slide block 301, and is used for fixing the limiting pin 308; the force accumulating element 302 is arranged in the soft needle slider 301.

The hard needle slider 303 is used for fixing the hard needle 3030, and an opening is formed at the bottom for fixing the limiting pin 308. The hard needle slider 303 is disposed in the energy storage element 304, and the energy storage element 304 is disposed in the power storage element 302. Preferably, the hard needle 3030 passes through the hard needle slider 303, the energy storage element 304, the force storage element 302 and the soft needle slider 301 in sequence, and is fixed in a through groove in the hard needle slider 303, one end of the through groove is sleeved with the soft needle, and the other end of the through groove is arranged in the medicine inlet of the medicine storage tank.

The slide groove 305 is disposed between the driving device 20 and the needle injecting device 30, and is provided with a first limit opening and a second limit opening, the first limit opening is matched with the stop rod 306, the second limit opening is matched with the limit pin 308, and it should be noted that, a person skilled in the art can set the positions of the first limit opening and the second limit opening according to the positions of the needle injecting device 30 and the driving device 20.

One end of the stop rod 306 is propped against the driving wheel 205, and the other end of the stop rod passes through the first limit opening of the slideway slot 305 and is arranged in the first opening at the bottom of the soft needle slide block 301; the pushing element 307 is sleeved on the stop rod 306, it can be understood that the stop rod 306 is a trigger mechanism of the injection needle, in an initial state, one end of the stop rod 306 abuts against the driving wheel 205, and the other end limits the soft needle slider 301, and the pushing element 307 is in a compressed state at this time; when the driving wheel 205 rotates to the notch position, the pushing element 307 releases elastic potential energy to drive the stop rod 306 to disengage from the soft needle slider 301.

A limiting pin 308, one end of which penetrates through the second opening of the soft needle slider 301 and is arranged in the opening at the bottom of the hard needle slider 303, and the other end of which is propped against the slideway groove 305; the trigger element 309 is sleeved on the limiting pin 308. It will be appreciated that the limiting pin 308 is a trigger mechanism for the movement of the hard needle slider 303, and in the initial state, one end of the limiting pin 308 is abutted against the slideway slot 305, and the other end limits the soft needle slider 301, and at this time, the trigger element 309 is in a compressed state.

In order to realize the sliding of the soft needle slider 301 and the hard needle slider 303, the needle injection device 30 further comprises two sliding rails 310 fixed in the housing 10, and two sides of the soft needle slider 301 may be provided with protrusions, which are slidably arranged between the two sliding rails 310 and can move along the sliding rails.

With the understanding of the structure of the needle injecting device 30 provided in this embodiment, the operation and principle thereof will be described with reference to fig. 6 to 9.

Initial state: one end of the stop rod 306 is propped against the driving wheel 205, the other end of the stop rod passes through the first limit opening of the slideway slot 305 and is arranged in the first opening of the soft needle slide block 301, so that the soft needle slide block 301 is limited, and the pushing element 307 is in a compressed state at the moment; one end of the limiting pin 308 is propped against the slideway groove 305, the other end penetrates through the second opening of the soft needle slide block 301, is arranged in the opening at the bottom of the hard needle slide block 303, limits the hard needle slide block 303, and at the moment, the trigger element 309 is in a compression force storage state; the energy storage element 304 and the energy storage element 302 are both in a compressed energy storage state.

Soft needle insertion: when the driving wheel 205 rotates to the notch position, the stop rod 306 moves horizontally away from the soft needle slider 301 under the action of the elastic force of the pushing element 307, is separated from the soft needle slider 301 and the slideway slot 305, loses the limit on the soft needle slider 301, and the force storage element 302 releases elastic potential energy, so that the soft needle slider 301 moves downwards under the action of the elastic force of the force storage element 302, and the hard needle slider 303 and the soft needle slider 301 are fixedly connected due to the limiting pin 308, and the soft needle slider 301 drives the hard needle slider 303 and the energy storage element 304 to move downwards simultaneously while moving downwards, and at the moment, the hard needle 3030 and the soft needle 3010 are implanted into the skin of a human body simultaneously.

Hard needle retraction: when the limiting pin 308 moves to the second limiting opening of the slideway slot 305, the limiting pin moves horizontally away from the hard needle slider 303 under the action of the elastic force of the triggering element 309, the limiting action on the hard needle slider 303 is lost, and the energy storage element 304 releases elastic potential energy, so that the hard needle slider 303 moves upwards under the action of the elastic force of the energy storage element 304, the hard needle 3030 is pulled to retract, the soft needle 3010 is separated from the skin of a human body, and the soft needle 3010 is left under the skin.

End state: the soft needle is placed under the skin, the soft needle slide 301 is at the lower part, the force storage element 302 is in a released state, the hard needle and the hard needle slide 303 are retracted to the upper part, the energy storage element 304 is in a released state, at this time, the soft needle 3010 is still sleeved on the hard needle, the liquid storage tank 208 can fill the hard needle 3030 with medicine, and the medicine is infused into a human body through the soft needle 3010.

The medicine injection device provided by the embodiment of the invention has high integration level, reduces the manufacturing cost and energy consumption, lightens the weight and is convenient to use and carry; the medicine injection detection module is adopted, so that the output is more stable, direct and reliable, and the accurate control of the medicine liquid injection amount of a patient is facilitated; the injection needle device injects the needle downwards, the hard needle automatically rebounds, the soft needle is reserved under the skin, the needle inserting times are reduced, the infection risk is reduced, and the antibacterial property and the sealing property are good.

In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.

In the description herein, the terms "one particular embodiment," "some embodiments," "one embodiment," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (10)

1. A drug infusion device comprising a housing, drive means and needle injection means, said housing being adapted to secure said drive means and needle injection means, wherein,

the driving device comprises a swinging module, a driving module, a backstop module and a propulsion module; wherein,

the swing module comprises two swing arms, a center arm, an end cover and a pushing piece; wherein, the two ends of the center arm are respectively connected with the two swing arms; the end cover is provided with a threaded hole, and both ends of the end cover are provided with sliding arms which are respectively arranged on the two swing arms in a sliding way, so that the swing arms and the end cover are buckled; the pushing piece is fixed on the swing arm;

the driving module comprises a driving screw and a driving wheel; the inner wall and the outer wall of the driving screw are provided with threads, one end of the driving screw is arranged in the end cover and is in threaded connection with the threaded hole of the end cover, and the outer wall of the driving screw is also provided with a groove; the driving wheel comprises a first ratchet wheel and a second ratchet wheel, the driving wheel is driven by the pushing piece and sleeved on the driving screw, a bulge matched with the groove of the driving screw is arranged in the middle of the driving wheel and used for limiting radial runout of the driving screw and realizing synchronous rotation of the driving screw and the driving wheel, and the driving screw can axially slide along the driving wheel; the driving wheel is provided with a notch;

the backstop module is fixed on the shell and used for limiting the unidirectional rotation of the driving wheel;

the propulsion module comprises a plunger and a liquid storage tank; wherein, one end of the plunger is provided with an inner screw rod which is in threaded connection with the inner wall of the driving screw rod; the liquid storage tank is used for storing liquid, is fixed on the shell, is sleeved on the outer side of the plunger and is used for limiting the rotation of the plunger;

the needle injection device comprises a soft needle sliding block, a force storage element, a hard needle sliding block, an energy storage element, a slideway slot, a stop rod, a pushing element, a limiting pin and a triggering element; wherein,

the soft needle sliding block is used for fixing the soft needle, an opening is formed in the bottom of the soft needle sliding block, and the force storage element is arranged in the soft needle sliding block; the hard needle sliding block is used for fixing a hard needle, an opening is formed in the bottom of the hard needle sliding block, the hard needle sliding block is arranged in the energy storage element, and the energy storage element is arranged in the force storage element;

the slideway groove is arranged between the driving device and the needle injection device and is provided with a first limit opening and a second limit opening;

one end of the stop rod is propped against the driving wheel, and the other end of the stop rod penetrates through the first limit opening of the slideway slot and is arranged in the opening at the bottom of the soft needle sliding block;

the pushing element is sleeved on the stop rod;

one end of the limiting pin penetrates through the soft needle sliding block and is arranged in the opening at the bottom of the hard needle sliding block, and the other end of the limiting pin abuts against the slideway slot;

the trigger element is sleeved on the limiting pin.

2. The drug infusion device of claim 1, wherein the front end of the drive wheel is provided with two limiting pieces which are matched with the grooves of the drive screw, and the drive wheel and the drive screw are synchronously rotated through the protruding part of the inner wall of the drive wheel and the front end limiting pieces.

3. The drug infusion device of claim 1, wherein the housing is provided with a plurality of fixing posts respectively fixed at the front end of the driving wheel through fixing seats for limiting radial runout and axial movement of the driving wheel.

4. The drug infusion device of claim 2, wherein the drive wheel further comprises a collar disposed between the first ratchet and the second ratchet, the anchor seats being disposed at upper and lower ends of the collar to axially constrain the drive wheel; the notch is arranged on the convex ring.

5. A drug infusion device as in claim 1, wherein the drive means is operative to include:

driving the driving wheel: under the action of a first power source, the swing module rotates along a first direction to drive the end cover and the pushing piece to move, so that the first ratchet wheel is driven to rotate by a half of a tooth angle along the first direction to drive the driving wheel and the driving screw to rotate, and the rotation movement is converted into linear stepping movement of the inner screw to drive the pushing plug to axially move in a direction far away from the driving screw due to the limit of the rotation of the pushing plug, so that the liquid medicine infusion is pushed;

rollback driving: under the action of a second power source, the swing module rotates along a second direction to drive the end cover and the pushing piece to move, the pushing piece slides back from the driving wheel, at the moment, the second ratchet wheel generates a rotation trend along the second direction, and the retaining piece carries out unidirectional rotation limiting on the second ratchet wheel; because the end cover rotates, the driving screw rod generates relative rotation and moves in the direction away from the end cover, the pushing plug is driven to move in the direction away from the end cover and axially move, and the liquid medicine is pushed to be infused.

6. The drug infusion device of claim 5, wherein the power source is a driving wire connected to the swing arm, and the driving wire is energized to shrink and drive the swing arm to rotate.

7. The drug infusion device of claim 1, wherein the drive means further comprises a limiting post disposed on either side of the two swing arms for limiting the angle of each rotation of the swing arms to half a tooth.

8. The drug infusion device of claim 1, wherein the needle infusion apparatus further comprises two slide rails secured within the housing; the soft needle sliding block is arranged between the two sliding rails in a sliding way.

9. The drug infusion device of claim 1, wherein the hard needle passes through the hard needle slider, the energy storage element, the force storage element and the soft needle slider, is fixed inside the hard needle slider, is sleeved with the soft needle at one end, and is placed in the drug inlet of the drug storage tank at the other end.

10. The drug infusion device of claim 1, wherein the needle injector device is operative to include:

initial state: one end of the stop rod is propped against the driving wheel, and the other end of the stop rod limits the soft needle sliding block, so that the pushing element is in a compressed state; one end of the limiting pin is propped against the slideway slot, and the other end limits the hard needle sliding block, so that the trigger element is in a compressed state; the energy storage element and the force storage element are in a compressed state;

soft needle insertion: when the driving wheel rotates to the notch position, the stop rod horizontally moves away from the soft needle sliding block under the action of the elastic force of the pushing element, and is separated from the soft needle sliding block and the slideway groove, so that the limit on the soft needle sliding block is lost, the soft needle sliding block moves downwards under the action of the elastic force of the force storage element, the hard needle sliding block and the energy storage element also move downwards at the same time, and the hard needle and the soft needle are implanted into the skin of a human body at the same time;

hard needle retraction: when the limiting pin moves to the second limiting opening of the slideway slot, the limiting pin moves horizontally in the direction away from the hard needle sliding block under the action of the elastic force of the triggering element, the limiting effect on the hard needle sliding block is lost, so that the hard needle sliding block moves upwards under the action of the elastic force of the energy storage element, the hard needle is pulled to retract, the soft needle is separated from the skin of a human body, and the soft needle is left under the skin;

end state: the soft needle is placed under the skin, the soft needle sliding block is positioned at the lower part, the energy storage element is positioned at the release state, the hard needle and the hard needle sliding block are retracted to the upper part, and the energy storage element is positioned at the release state.