CN115581826A - Medicine injection equipment driven in reciprocating cycle - Google Patents

Abstract

The embodiment of the invention relates to a medicine injection device driven by reciprocating circulation, which mainly comprises the following structures: the swinging module comprises two first guide rails, two swinging arms, a connecting arm and a base; the two pushing modules are respectively sleeved on the two first guide rails and can axially move along the first guide rails; the pushing module comprises a first pushing sheet and a second pushing sheet; the rotating module comprises a group wheel and an outer screw rod; the unidirectional stopping module is connected with the group wheel and controls the group wheel to rotate in a unidirectional way; the limiting module is used for limiting the swing arm; the inner screw is arranged in the outer screw; the piston is fixedly connected with the top end of the inner screw rod; the medicine tank is used for loading medicine liquid. The invention adopts a double-swing arm and double-screw structure, has strong stability, compact structure, small volume and convenient carrying; accurate injection of the dosage of the medicine can be achieved through the double-ratchet wheel arrangement, and a user can inject liquid medicine with different dosages according to requirements, so that the requirements of users with different dosages are met.

Description

Medicine injection equipment driven in reciprocating cycle

Technical Field

The invention relates to the field of medicines, in particular to a medicine injection device driven in a reciprocating cycle mode.

Background

The application type drug delivery device is a medical appliance device which is used for realizing the treatment of the disease condition of a patient by continuously injecting drugs into the body of the patient. The extensive treatment that is used for the diabetes of device, application formula insulin pump system are a section and are used for the diabetes patient to infuse the equipment of insulin, compare with traditional insulin pump, and application formula insulin pump does not have the pipeline, can wear on one's body, can constantly carry basic insulin and the insulin of large dose in two to three days.

The existing application type drug delivery device has large volume and inconvenient carrying, a user cannot accurately control the injection metering of the liquid medicine, and the injection dosage is single, thereby bringing great troubles to the user.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a medicine injection device driven in a reciprocating cycle manner, which adopts a double-swing arm and double-screw structure, has strong stability, compact structure, small volume and convenient carrying; accurate injection of the dosage of the medicine can be achieved through the double-ratchet wheel arrangement, and a user can inject liquid medicine with different dosages according to requirements, so that the requirements of users with different dosages are met.

In view of the above, an embodiment of the present invention provides a drug infusion device driven by a reciprocating cycle, including:

the swinging module comprises two first guide rails, two swinging arms, a connecting arm and a base; the first guide rails are arranged on the inner sides of the swing arms, the top ends of the two first guide rails and the top ends of the two swing arms are fixed on the connecting arm, and the bottom ends of the two first guide rails and the two swing arms are fixed on the base; a through hole is formed in the middle of the connecting arm;

the two pushing modules are respectively sleeved on the two first guide rails and can axially move along the first guide rails; the pushing module comprises a first pushing sheet and a second pushing sheet;

the rotating module comprises a group wheel and an outer screw rod; the group of wheels comprises a first ratchet wheel and a second ratchet wheel which are arranged in a staggered mode and fixedly connected, the first ratchet wheel is driven by the first pushing piece, and the second ratchet wheel is driven by the second pushing piece; the outer screw rod is vertically fixed on the wheel set, is provided with an external thread and an internal thread, and is in threaded connection with the through hole of the connecting arm;

the one-way stopping module is connected with the group wheel and controls the group wheel to rotate in one direction;

the limiting module limits the swing arm, and when the swing arm rotates to the limiting module, the swing arm stops rotating;

the inner screw is arranged in the outer screw and is in threaded connection with the internal thread of the outer screw;

the piston is fixedly connected with the top end of the inner screw rod;

the medicine tank is used for loading medicine liquid and is sleeved on the piston, and the piston moves upwards to press the medicine liquid in the medicine tank.

Preferably, the limiting module comprises a first limiting base and a second limiting base;

when the swing arm rotates to the first limiting base, the swing arm stops rotating;

when the swing arm rotates to the second limiting base, the swing arm stops rotating.

Preferably, the device further comprises two driving wires respectively connected with the two swing arms for driving the swing arms to rotate.

Preferably, the equipment further comprises a first support, and the base is fixed on the first support through a rotating shaft.

Further preferably, the device further comprises a back plate and a second support;

the back plate is fixedly connected with the side face of the first support;

the second support is fixed between the connecting arm and the back plate.

Further preferably, the one-way stopping module comprises a second guide rail and a stopping piece;

the top end of the second guide rail is fixed on the second support, and the bottom end of the second guide rail is fixed on the first support;

the stop piece is sleeved on the second guide rail and connected with the group wheel to control the group wheel to rotate in one direction.

Preferably, the operation process of the drug injection device comprises:

in the process, the swing arm drives the pushing module to rotate along with the rotation, the first pushing piece pushes the first ratchet wheel to drive the group wheel and the outer screw rod to rotate along the first direction, and the swing arm and the outer screw rod cannot axially move due to the fixed base, so that the inner screw rod axially upwards spirals out of the outer screw rod to push the piston to upwards move to extrude the liquid medicine in the medicine tank;

in the process, as the combined wheel is fixed under the action of the one-way stop module, the swing arm drives the pushing module to rotate across the combined wheel, and the outer screw rod and the inner screw rod cannot rotate, the outer screw rod axially upwards screws out of the connecting arm to drive the combined wheel and the inner screw rod to axially upwards move, so that the piston is pushed to upwards move to extrude the liquid medicine in the medicine tank; wherein the first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction;

in the third stage, the swing arm rotates in the first direction under the action of a third driving force until the swing arm stops rotating to a limiting module, in the process, the swing arm drives the pushing module to rotate along with the swing arm, the second pushing piece pushes the second ratchet wheel to drive the group of wheels and the outer screw rod to rotate in the first direction, and the swing arm and the outer screw rod cannot axially move due to the fact that the base is fixed, so that the inner screw rod axially and upwards screws out of the outer screw rod, the piston is pushed to move upwards, and the liquid medicine in the medicine tank is extruded out;

in the process, as the combined wheel is fixed under the action of the one-way stopping module, the swing arm drives the pushing module to rotate across the combined wheel, and the outer screw rod and the inner screw rod cannot rotate, the outer screw rod axially upwards screws out of the connecting arm to drive the combined wheel and the inner screw rod to axially upwards move, so that the piston is pushed to upwards move to press out the liquid medicine in the medicine tank;

and circulating the first stage and the fourth stage until the piston reaches the top end of the medicine tank and stops working.

Further preferably, a limit groove is arranged between the first ratchet wheel and the second ratchet wheel; the pushing module further comprises a limiting part arranged in the limiting groove, and when the equipment works, the pushing module is axially limited through the matching of the limiting groove and the limiting part.

Further preferably, the group wheel further comprises a cam, which is arranged between the first ratchet wheel and the second ratchet wheel, and the diameter of the cam is larger than that of the first ratchet wheel and that of the second ratchet wheel; and the cam is arranged between the first pushing sheet and the second pushing sheet and used for axially limiting the pushing module when the equipment works.

Preferably, the first ratchet wheel and the second ratchet wheel have the same number of teeth, and the teeth of the first ratchet wheel and the teeth of the second ratchet wheel are arranged in a staggered mode.

The medicine injection equipment driven in a reciprocating cycle manner provided by the embodiment of the invention adopts a double-swing arm and double-screw structure, and has the advantages of strong stability, compact structure, small volume and convenience in carrying; accurate injection of the dosage of the medicine can be achieved through the double-ratchet wheel arrangement, and a user can inject liquid medicine with different dosages according to requirements, so that the requirements of users with different dosages are met.

Drawings

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

fig. 2 is an exploded view of a drug infusion device according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a part of a drug injection device according to an embodiment of the present invention;

FIG. 4 is an exploded view of a portion of a drug infusion device in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of a portion of another drug infusion device in accordance with an embodiment of the present invention;

fig. 6 is a top plan view of a drug infusion device during a first and third stage operation in accordance with an embodiment of the present invention;

FIG. 7 is a schematic diagram of a first stage operation of a wheel set according to an embodiment of the present invention;

fig. 8 is a front elevational view of a drug infusion device during a first and third stage of operation in accordance with an embodiment of the present invention;

fig. 9 is a top view of a drug infusion device during a second and fourth phase of operation in accordance with an embodiment of the present invention;

FIG. 10 is a schematic diagram of a second and fourth phase operation of a wheel set according to an embodiment of the present invention;

fig. 11 is an elevational view of a drug infusion device during second and fourth phases of operation in accordance with an embodiment of the present invention;

fig. 12 is a schematic diagram of a third stage operation process of a set of wheels according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Fig. 1 is a schematic structural diagram of a drug injection device according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of an explosion of a drug injection device according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of a part of a drug injection device according to an embodiment of the present invention, fig. 4 is a schematic partial explosion of a drug injection device according to an embodiment of the present invention, and referring to fig. 1 to 4, a drug injection device driven in a reciprocating cycle according to an embodiment of the present invention includes a swing module 11, two push modules 12, a rotation module 13, a one-way stop module 14, a limit module 15, an internal screw 16, a piston 17, and a drug container 18, and the following describes the structure of each part of the device in detail.

And the swinging module 11 is used for receiving an external driving force to generate swinging so as to drive the pushing module 12. The swing module 11 may specifically include two first guide rails 111, two swing arms 112, a connecting arm 113, and a base 114; the first guide rails 111 are arranged on the inner sides of the swing arms 112, the top ends of the two first guide rails 111 and the top ends of the two swing arms 112 are fixed on the connecting arm 113, and the bottom ends of the two first guide rails 111 and the two swing arms 112 are fixed on the base 114, it can be understood that the connecting arm 113 and the base 114 are used for connecting the two swing arms 112 and fixing the two first guide rails 111, further, a through hole is formed in the middle of the connecting arm 113, and threads are arranged in the through hole; the two swing arms 112 are of a symmetrical structure, so that the input is more stable, and the supporting effect is achieved.

It should be noted that the source of the external driving force may be applied by a user, or may be generated by a power module, where the power module includes, but is not limited to, a driving motor and a driving wire, in this embodiment, the power module includes two driving wires 19, which are respectively connected to two swing arms 112, and are used for generating a driving force to drive the swing arms 112 to rotate, when the device does not work, the driving wires 19 are in a loose state, and when the device works, the driving wires 19 are in a contracted state. In a preferred embodiment, the driving wire 19 can be a driving wire, and when the device is operated, the two driving wires are alternately powered, and the electric wire is changed from a relaxed state to a contracted state to generate a driving force to drive the swing arm 112 to rotate.

And two pushing modules 12, which are used for driving the rotating module 13 to rotate. The two pushing modules 12 are respectively sleeved on the two first guide rails 111 and can axially move along the first guide rails 111, and the first guide rails 111 are arranged on the inner sides of the swing arms 112, so that the swing arms 112 form pushing module limiting surfaces, and the pushing modules 12 are limited when the swing arms 112 rotate; in this embodiment, the pushing module 12 may specifically include a first pushing sheet 121 and a second pushing sheet 122, and the first pushing sheet 121 and the second pushing sheet 122 are disposed in a staggered manner.

It is understood that the number of the pushing modules 12 is the same as the number of the swing arms 112, and those skilled in the art can select and set the number of the pushing modules 12 and the number of the swing arms 112 according to the requirement.

The rotating module 13 specifically comprises a group wheel 131 and an outer screw 132; the wheel set 131 includes a first ratchet 1311 and a second ratchet 1312 staggered up and down and fixedly connected to each other, the first pushing piece 121 is connected to the first ratchet 1311, the first ratchet 1311 is driven by the first pushing piece 121, the second pushing piece 122 is connected to the second ratchet 1312, and the second ratchet 1312 is driven by the second pushing piece 122. In the present embodiment, the numbers of teeth of the first ratchet 1311 and the second ratchet 1312 are the same, and the teeth of the first ratchet 1311 and the second ratchet 1312 are alternatively arranged to match the two pushing modules 12, it should be understood that when the swing arm 112 rotates in one direction, the first pushing piece 121 and the second pushing piece 122 are driven to alternately operate, the first pushing piece 121 drives the first ratchet 1311 to rotate by one tooth, then the second pushing piece 122 drives the second ratchet 1312 to rotate by one tooth, so as to complete one alternation, after that, the first pushing piece 121 drives the first ratchet 1311 to rotate by one tooth, then the second pushing piece 122 drives the second ratchet 1312 to rotate by one tooth, so as to complete the second alternation, thereby achieving the alternation cycle.

In a preferred embodiment, in order to ensure the stability of the device during operation, the pushing module 12 is axially limited, and a limiting groove is arranged between the first ratchet 1311 and the second ratchet 1312; the pushing module 12 further comprises a limiting part 123 arranged in the limiting groove, when the device works, the pushing module 12 is axially limited through the matching of the limiting groove and the limiting part 123, specifically, when the set wheel 13 rotates in the horizontal direction, the pushing module 12 can be guaranteed not to axially displace, and when the set wheel axially moves, the pushing module 12 can be driven to axially move on the first guide rail 111.

In another preferred embodiment, in order to ensure the stability of the device during operation, the above-mentioned limit may be in other forms, and as shown in fig. 5 in particular, the group wheel 131 further includes a cam 1313 disposed between the first ratchet 1311 and the second ratchet 1312, the diameter of the cam 1313 being greater than the diameter of the first ratchet 1311 (the second ratchet 1312); moreover, the cam 1313 is disposed between the first pushing sheet 121 and the second pushing sheet 122, and is used for axially limiting the pushing module when the device works, and the limiting process is similar to that of the above embodiment, and is not described again here.

It is understood that the pushing module 12 has the same number of pushing pieces as the ratchet wheels in the group wheel 131, and the number of the pushing pieces and the ratchet wheels can be two or more, and those skilled in the art can select and set the number of the pushing pieces and the ratchet wheels according to the requirement.

The outer screw 132 is vertically fixed to the set wheel 131, and it is understood that when the set wheel 131 rotates, the outer screw 132 is driven to rotate. Moreover, an external thread is provided on the outer side of the external screw 132, and the external thread is screwed with the through hole of the connecting arm 113, thereby realizing the relative movement of the external screw 132 and the connecting arm 113; further, a through hole is formed in the outer screw 132, and an internal thread is formed in the through hole for screw-coupling with the inner screw 16, whereby the relative movement of the outer screw 132 and the inner screw 16 is achieved.

The one-way stopping module 14 is connected to the group wheel 131 and functions to control the group wheel 131 to rotate in one direction, and the one-way stopping module includes, but is not limited to, one-way stopping piece 142.

And the limiting module 15 is used for limiting the swing arm 112 and stopping rotating when the swing arm 112 rotates to the limiting module 15. In this embodiment, the limiting module 15 is disposed at one side of the swing module 11, and may be a limiting block with a thickness to limit the two swing arms 112 simultaneously, or two limiting units to limit the two swing arms 112 respectively, in a specific example, the limiting module 15 may include a first limiting base 151 and a second limiting base 152, the limiting bases may generate a limiting surface, the first limiting base 151 is used to limit the right swing arm 112, and when the right swing arm 112 rotates to the limiting surface, the rotation is stopped; the second limit base 152 is used for limiting the left swing arm 112, and when the left swing arm 112 rotates to a limit surface, the rotation is stopped.

The inner bolt 16, which is disposed inside the outer bolt 132 and is threadedly engaged with the internal thread of the outer bolt 132, can be axially upwardly unscrewed from the outer bolt 132 or downwardly screwed into the outer bolt 132, whereby the axial size of the apparatus can be greatly reduced, making the structure more compact to release the space inside the apparatus, providing convenience to the user.

The piston 17, fixedly connected to the top end of the inner screw 16, moves axially upward or downward with the inner screw 16, it being understood that the piston 17 moves with the inner screw and does not rotate because the piston 17 is fixedly connected to the top end of the inner screw 16.

The medicine tank 18 is used for loading medicine liquid and is sleeved on the piston 17, the piston 17 moves upwards to press out the medicine liquid in the medicine tank 18, and the medicine liquid comprises but is not limited to insulin, glucagon, antibiotics, nutrient solution, analgesic, morphine, anticoagulant, gene therapy medicine, cardiovascular medicine or chemotherapy medicine and the like.

In a preferred embodiment, in order to achieve stability of the device, the device further comprises a first support 20, the base 114 is fixed on the first support 20 through a rotating shaft, and the base 114 can rotate on the first support 20 around the rotating shaft, wherein the rotating shaft is preferably arranged at the center of the base 114.

Further, in order to facilitate carrying by a user and improve stability of the apparatus, the apparatus further includes a back plate 21 and a second support 22, as shown in fig. 1 to 3; wherein, the back plate 21 is fixedly connected with the side surface of the first support 20; the second support 22 is fixed between the connecting arm 113 and the back plate 21, thereby fixing both the top and bottom of the device to the back plate 21 for structural stability.

In a more preferred embodiment, the one-way stopping module 14 may specifically include a second rail 141 and a stopping piece 142; the top end of the second guide rail 141 is fixed on the second support 22, and the bottom end is fixed on the first support 20, so that the second guide rail 141 is fixed up and down, and the stability of the one-way locking module 14 in operation is realized; the stop piece 142 is sleeved on the second rail 141 and can move along the axial direction of the second rail 141, and the stop piece 142 is connected with the group wheel 131 to control the group wheel 131 to rotate in one direction, wherein the two stop pieces 142 are preferably used for controlling the first ratchet 1311 and the second ratchet 1312 to rotate in one direction respectively.

With the understanding of the structure of the reciprocating cyclically driven drug infusion device provided by the embodiments of the present invention, the operation of the device will be described in detail with reference to the above structure.

The working process of the drug injection device provided by the embodiment specifically includes four stages:

in the first stage, as shown in fig. 6, 7 and 8, the swing arm 112 rotates in the first direction under the action of the first driving force until the swing arm 112 stops rotating to the limit module 15, in the process, the swing arm 112 drives the pushing module 12 to rotate, the first pushing blade 121 pushes the first ratchet 1311 to drive the set wheel 131 and the outer screw 132 to rotate in the first direction, and since the base 114 is fixed, the swing arm 112 and the outer screw 132 cannot move axially, the inner screw 16 is screwed out from the outer screw 132 in the axial direction, so as to push the piston 17 to move upwards to press out the liquid medicine in the medicine tank 18.

In the second stage, as shown in fig. 9, 10 and 11, the swing arm 112 rotates in the second direction under the action of the second driving force until the swing arm 112 stops rotating to the limit module 15, in this process, since the set wheel 131 is fixed under the action of the one-way stop module 14, the swing arm 112 drives the pushing module 12 to rotate over the set wheel 131, the outer screw 132 and the inner screw 16 cannot rotate, so that the outer screw 132 is axially screwed out of the connecting arm 113 upwards, the set wheel 131 and the inner screw 16 are driven to axially move upwards, and the piston 17 is driven to move upwards to extrude the liquid medicine in the medicine tank 18. At this point, the swing arm 112 completes the first reciprocating motion.

The third stage, as shown in fig. 6, 8 and 12, is similar to the first stage, except that the working area of the third stage group wheel 131 is on the second ratchet wheel 1312, the specific process is as follows: the swing arm 112 rotates in the first direction under the action of the third driving force until the swing arm 112 rotates to the limit module 15, and in the process, the swing arm 112 drives the push module 12 to rotate, the second push plate 122 pushes the second ratchet 1312 to drive the group wheel 131 and the outer screw 132 to rotate in the first direction, and since the base 114 is fixed and the swing arm 112 and the outer screw 132 cannot move axially, the inner screw 16 is screwed out of the outer screw 132 axially upwards, so that the piston 17 is pushed to move upwards to extrude the liquid medicine in the medicine tank 18.

In the fourth stage, as shown in fig. 9, 10 and 11, the same as the second stage, the specific process is as follows: in the process, as the set wheel 131 is fixed under the action of the one-way locking module 14, the swing arm 112 drives the pushing module 12 to rotate over the set wheel 131, and the outer screw 132 and the inner screw 16 cannot rotate, so that the outer screw 132 is screwed out from the connecting arm 113 in the axial direction, and drives the set wheel 131 and the inner screw 16 to move upward in the axial direction, thereby pushing the piston 17 to move upward to press out the liquid medicine in the medicine tank 18. At this point, the swing arm 112 completes a second reciprocating motion and the entire apparatus completes a cycle.

The first and fourth phases are cycled until the piston 17 reaches the top of the canister 18 and stops working.

The first direction is opposite to the second direction, and the first direction may be a clockwise direction or a counterclockwise direction, and may be set by a person skilled in the art as needed.

Further, the rotation angles of the swing arm 112 in the first stage, the second stage, the third stage and the fourth stage are all the same, that is, the magnitudes of the first driving force, the second driving force, the third driving force and the fourth driving force are all the same, and for convenience of description of the stages, the first driving force, the second driving force, the third driving force and the fourth driving force are respectively distinguished, and it can be understood that the direction of the first driving force is the same as that of the third driving force, and the direction of the second driving force is the same as that of the fourth driving force.

It can be understood that the medicine feeding amount per time is determined by the upward displacement of the piston 17, and the upward displacement of the piston 17 is related to the rotation angle of the swing arm 112, the number and rotation angle of the teeth of the set wheel 131, and the pitch of the threads of the through holes of the outer screw 132, the inner screw 16, and the connecting arm 113, for example, the more the number of the teeth of the set wheel 131 is, the smaller the rotation angle per time is, the more accurate the medicine feeding amount per time is, and therefore, the person skilled in the art can set the rotation angle of the swing arm 112, the number and rotation angle of the teeth of the set wheel 131, the pitch of the threads of the through holes of the outer screw 132, the inner screw 16, and the connecting arm 113 according to the requirement of the medicine feeding amount per time.

In order to better understand the operation of the apparatus, the following description is given by a specific embodiment in which the source of the driving force is the driving wire 19, each ratchet wheel has 50 teeth, and the limit base sets the limit rotation angle to 3.6 °.

In the first stage, as shown in fig. 6, 7 and 8, the right driving wire 19 is energized, the right driving wire 19 contracts to generate a driving force, so as to push the right swing arm 112 to drive the swing module 11 to rotate clockwise, and when the right swing arm 112 rotates clockwise by 3.6 ° to reach a limit surface of the first limit base 151, the swing arm stops rotating, and at the same time, the swing arm limits the push module 12 by pushing the limit surface of the module 12, in the process, the swing arm 112 drives the push module 12 to rotate along with the rotation, the first pushing piece 121 pushes the first ratchet 1311 to rotate by one tooth in the clockwise direction, thereby driving the set wheel 131 and the outer screw 132 to rotate clockwise, and since the base 114 is axially fixed, the swing arm 112 and the outer screw 132 cannot move axially, the inner screw 16 is axially upwardly screwed out of the outer screw 132, thereby pushing the piston 17 to move upwardly to press the liquid medicine in the medicine tank 18.

In the second stage, as shown in fig. 9, 10 and 11, the left driving wire 19 is energized, the left driving wire 19 contracts to generate a driving force, so as to push the left swing arm 112 to drive the swing module 11 to rotate counterclockwise, and when the left swing arm 112 rotates counterclockwise by 3.6 ° to reach a limit surface of the second limit base 152, the swing arm stops rotating, and at the same time, the swing arm limits the push module 12 by the limit surface of the push module 12, during this process, since the set wheel 131 is fixed by the one-way stop piece 142, the swing arm 112 drives the push module 12 to rotate over the set wheel 131, and the outer screw 132 and the inner screw 16 cannot rotate, so that the outer screw 132 is axially screwed out of the connecting arm 113, and drives the set wheel 131 and the inner screw 16 to axially move upward, thereby pushing the piston 17 to move upward to extrude the liquid medicine in the medicine tank 18. At this point, the swing arm 112 completes the first reciprocating motion.

The third stage, as shown in fig. 6, 8 and 12, is similar to the first stage, except that the working area of the third stage group wheel 131 is on the second ratchet wheel 1312, as follows: the right driving wire 19 is energized, the right driving wire 19 contracts to generate a driving force, the right swing arm 112 is pushed to drive the swing module 11 to rotate clockwise, when the right swing arm 112 rotates clockwise by 3.6 degrees and reaches a limit surface of the first limit base 151, the rotation is stopped, meanwhile, the swing arm limits the push module 12 by the limit surface of the push module 12, in the process, the swing arm 112 drives the push module 12 to rotate along with the rotation, the second push piece 122 pushes the second ratchet wheel 1312 to rotate by one tooth clockwise, so that the group wheel 131 and the outer screw 132 are driven to rotate clockwise, and because the base 114 is axially fixed, the swing arm 112 and the outer screw 132 cannot move axially, the inner screw 16 is screwed out from the outer screw 132 axially upwards, so that the piston 17 is pushed to move upwards to press out the liquid medicine in the medicine tank 18.

In the fourth stage, as shown in fig. 9, 10 and 11, the same as the second stage, the specific process is as follows: the left driving wire 19 is energized, the left driving wire 19 contracts to generate a driving force, the left swing arm 112 is pushed to drive the swing module 11 to rotate anticlockwise, when the left swing arm 112 rotates anticlockwise by 3.6 degrees and reaches a limit surface of the second limit base 152, the swing arm stops rotating, meanwhile, the swing arm limits the push module 12 through the limit surface of the push module 12, in the process, as the group wheel 131 is fixed and fixed under the action of the one-way stop piece 142, the swing arm 112 drives the push module 12 to rotate over the group wheel 131, and meanwhile, the outer screw 132 and the inner screw 16 cannot rotate, the outer screw 132 is screwed out of the connecting arm 113 in the axial direction upwards, the group wheel 131 and the inner screw 16 are driven to move upwards in the axial direction, and the piston 17 is pushed upwards to press out the liquid medicine in the medicine tank 18. At this point, the swing arm 112 completes the first reciprocating motion. At this point, the swing arm 112 completes a second reciprocating motion and the entire apparatus completes a cycle.

The first stage and the fourth stage are circulated, that is, the left driving wire 19 and the right driving wire 19 are alternately electrified until the piston 17 reaches the top end of the medicine tank 18 to stop working, it should be noted that, when in use, a user can control the number of stages of the device working through the required medicine amount, for example, the medicine liquid output amount corresponding to each stage is 1ml, if the medicine amount used each time is 1ml, the device works one stage, and if the medicine amount used each time is 3ml, the device works three stages, thereby realizing the precise control of the medicine amount.

The medicine injection equipment driven in a reciprocating cycle manner provided by the embodiment of the invention adopts a double-swing arm and double-screw structure, and has the advantages of strong stability, compact structure, small volume and convenience in carrying; accurate injection of the dosage of dosing can be realized through the double-ratchet setting, and a user can inject liquid medicine of different dosages according to requirements, so that the requirements of users with different dosages are met.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "a particular embodiment," "some embodiments," "an embodiment," etc., means 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, the schematic representations of the terms used above 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 above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A reciprocating cyclically driven drug infusion device, the device comprising:

the swinging module comprises two first guide rails, two swinging arms, a connecting arm and a base; the first guide rails are arranged on the inner sides of the swing arms, the top ends of the two first guide rails and the top ends of the two swing arms are fixed on the connecting arm, and the bottom ends of the two first guide rails and the top ends of the two swing arms are fixed on the base; a through hole is formed in the middle of the connecting arm;

the two pushing modules are respectively sleeved on the two first guide rails and can axially move along the first guide rails; the pushing module comprises a first pushing sheet and a second pushing sheet;

the rotating module comprises a group wheel and an outer screw rod; the group of wheels comprise first ratchet wheels and second ratchet wheels which are arranged in a staggered mode and fixedly connected, the first ratchet wheels are driven by the first pushing pieces, and the second ratchet wheels are driven by the second pushing pieces; the outer screw rod is vertically fixed on the wheel set, is provided with an external thread and an internal thread, and is in threaded connection with the through hole of the connecting arm;

the one-way stopping module is connected with the group wheel and controls the group wheel to rotate in one direction;

the limiting module limits the swing arm, and the swing arm stops rotating when rotating to the limiting module;

the inner screw is arranged in the outer screw and is in threaded connection with the inner thread of the outer screw;

the piston is fixedly connected with the top end of the inner screw rod;

the medicine tank is used for loading medicine liquid and is sleeved on the piston, and the piston moves upwards to press the medicine liquid in the medicine tank.

2. The reciprocating cyclical driven drug infusion device of claim 1 wherein the spacing module comprises a first spacing base and a second spacing base;

when the swing arm rotates to the first limiting base, the swing arm stops rotating;

when the swing arm rotates to the second limiting base, the swing arm stops rotating.

3. A reciprocating cyclically driven drug infusion device according to claim 1 further comprising two drive wires connected to the two swing arms respectively for driving the swing arms in rotation.

4. The reciprocating cyclical driven drug infusion device of claim 1 wherein the device further comprises a first support to which the base is secured by a rotatable shaft.

5. The reciprocating cyclically driven drug infusion device of claim 4 further comprising a back plate and a second seat;

the back plate is fixedly connected with the side face of the first support;

the second support is fixed between the connecting arm and the back plate.

6. The reciprocating cyclical driven drug infusion device of claim 5 wherein the one-way stop module comprises a second guide track and a stop tab;

the top end of the second guide rail is fixed on the second support, and the bottom end of the second guide rail is fixed on the first support;

the stop piece is sleeved on the second guide rail and connected with the group wheel to control the group wheel to rotate in one direction.

7. The reciprocating cyclically driven drug infusion device of claim 1 wherein,

the working process of the medicine injection device comprises the following steps:

in the process, the swing arm drives the pushing module to rotate along with the rotation, the first pushing piece pushes the first ratchet wheel to drive the group wheels and the outer screw rod to rotate along the first direction, and the swing arm and the outer screw rod cannot axially move due to the fact that the base is fixed, so that the inner screw rod axially and upwards screws out of the outer screw rod, the piston is pushed to move upwards, and liquid medicine in the medicine tank is extruded out;

in the process, as the combined wheel is fixed under the action of the one-way stop module, the swing arm drives the pushing module to rotate across the combined wheel, and the outer screw rod and the inner screw rod cannot rotate, the outer screw rod axially upwards screws out of the connecting arm to drive the combined wheel and the inner screw rod to axially upwards move, so that the piston is pushed to upwards move to extrude the liquid medicine in the medicine tank; wherein the first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction;

in the third stage, the swing arm rotates along the first direction under the action of a third driving force until the swing arm stops rotating to a limit module, in the process, the swing arm drives the pushing module to rotate along with the swing arm, the second pushing piece pushes the second ratchet wheel to drive the group wheel and the outer screw rod to rotate along the first direction, and the swing arm and the outer screw rod cannot axially move due to the fixed base, so that the inner screw rod axially upwards spirals out of the outer screw rod, and the piston is pushed to upwards move to extrude the liquid medicine in the medicine tank;

in the process, as the assembled wheel is fixed under the action of the one-way stopping module, the swing arm drives the pushing module to rotate over the assembled wheel, and the outer screw rod and the inner screw rod cannot rotate, the outer screw rod is screwed out of the connecting arm upwards along the axial direction to drive the assembled wheel and the inner screw rod to move upwards along the axial direction, so that the piston is pushed to move upwards to extrude the liquid medicine in the medicine tank;

and circulating the first stage and the fourth stage until the piston reaches the top end of the medicine tank and stops working.

8. A reciprocating cyclically driven drug infusion device according to claim 1 wherein a spacing groove is provided between the first ratchet and the second ratchet; the pushing module further comprises a limiting part arranged in the limiting groove, and when the equipment works, the pushing module is axially limited through the matching of the limiting groove and the limiting part.

9. The reciprocating cyclical driven drug infusion device of claim 1 wherein the set of wheels further comprises a cam disposed between the first ratchet and the second ratchet, the cam having a larger diameter than the first ratchet and the second ratchet; and the cam is arranged between the first pushing sheet and the second pushing sheet and used for axially limiting the pushing module when the equipment works.

10. The reciprocating cyclical driven drug infusion device of claim 1 wherein the first ratchet and the second ratchet have the same number of teeth and wherein the teeth of the first ratchet and the second ratchet are staggered.

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