A reciprocating cycle driven drug injection device

Abstract

The embodiment of the present application relates to a reciprocating cycle driven medicine injection device, which mainly comprises the following structure: a swing module comprising two first guide rails, two swing arms, a connecting arm and a base; two push modules respectively sleeved on the two first guide rails and capable of moving along the axial direction of the first guide rails; the push module comprises a first push piece and a second push piece; a rotating module comprising a group wheel and an outer screw; a one-way stop module connected with the group wheel and used for controlling the one-way rotation of the group wheel; a limiting module used for limiting the swing arm; an inner screw arranged in the outer screw; a piston fixedly connected with the top end of the inner screw; and a medicine tank used for loading medicine liquid.The present application adopts a double-swing-arm and double-screw structure, has high stability, compact structure and small volume, and is convenient to carry; through the double-ratchet-wheel arrangement, the precise injection of the medicine dose can be realized, and the user can inject different doses of medicine liquid according to the requirement, so as to meet the requirement of users with different doses.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medicine, in particular to a reciprocating cycle driven drug injection device. BACKGROUND

[0002] The patch drug delivery device is a kind of medical device that realizes the treatment of patient's disease by continuously injecting drug into the patient's body. The device is widely used in the treatment of diabetes. The patch insulin pump system is a device for infusing insulin for diabetic patients. Compared with the traditional insulin pump, the patch insulin pump has no pipeline and can be worn on the body, and can continuously deliver basal insulin and large-dose insulin for two to three days.

[0003] The existing patch drug delivery device is large in size and inconvenient to carry. The user cannot accurately control the injection amount of the drug liquid, and the injection dose is single, which brings great trouble to the user in use. SUMMARY

[0004] The purpose of the present application is to overcome the defects of the prior art, provide a reciprocating cycle driven drug injection device, which adopts a double swing arm and double screw structure, is stable, compact in structure and small in size, and is convenient to carry. The accurate injection of the drug dose can be realized by the double ratchet wheel arrangement, and the user can inject different doses of drug liquid according to the demand, so as to meet the needs of users with different doses.

[0005] Therefore, the present application provides a reciprocating cycle driven drug injection device, which comprises:

[0006] The swing module comprises two first guide rails, two swing arms, a connecting arm and a base. The first guide rails are arranged on the inner sides of the swing arms, and the top ends of the two first guide rails and the two swing arms are fixed on the connecting arm, and the bottom ends are fixed on the base. The connecting arm is provided with a through hole in the middle;

[0007] Two push modules are respectively sleeved on the two first guide rails and can move axially along the first guide rails. The push module comprises a first push piece and a second push piece;

[0008] The rotating module comprises a group wheel and an outer screw. The group wheel comprises a first ratchet wheel and a second ratchet wheel arranged alternately and fixedly connected. The first ratchet wheel is driven by the first push piece, and the second ratchet wheel is driven by the second push piece. The outer screw is perpendicular to and fixed on the group wheel. The outer screw is provided with an outer thread and an inner thread, and the outer thread is screwed with the through hole of the connecting arm;

[0009] The one-way stop module is connected with the group wheel and controls the one-way rotation of the group wheel;

[0010] A limiting module is arranged to limit the swing arm, and the swing arm stops rotating when it rotates to the limiting module;

[0011] An inner screw rod is arranged in the outer screw rod and is screwed with the inner thread of the outer screw rod;

[0012] A piston is fixedly connected to the top end of the inner screw rod;

[0013] A medicine tank is arranged to load medicine liquid and is sleeved on the piston, and the upward movement of the piston can press out the medicine liquid in the medicine tank.

[0014] Preferably, the limiting module comprises a first limiting base and a second limiting base;

[0015] The swing arm stops rotating when it rotates to the first limiting base;

[0016] The swing arm stops rotating when it rotates to the second limiting base.

[0017] Preferably, the device further comprises two driving wires respectively connected to the two swing arms, for driving the swing arms to rotate.

[0018] Preferably, the device further comprises a first support, and the base is fixed to the first support through a rotating shaft.

[0019] Further preferably, the device further comprises a back plate and a second support;

[0020] The back plate is fixedly connected to the side surface of the first support;

[0021] The second support is fixed between the connecting arm and the back plate.

[0022] Further preferably, the one-way stop module comprises a second guide rail and a stop piece;

[0023] The top end of the second guide rail is fixed to the second support, and the bottom end is fixed to the first support;

[0024] The stop piece is sleeved on the second guide rail and is connected with the group of wheels, for controlling the one-way rotation of the group of wheels.

[0025] Preferably, the working process of the medicine injection device comprises:

[0026] In the first stage, the swing arm rotates in a first direction under the action of a first driving force until it stops when it reaches the limiting module. In this process, the swing arm drives the pushing module to rotate, the first pushing piece pushes the first ratchet, and the group wheel and the outer screw rotate in the first direction. Since the base is fixed, the swing arm and the outer screw cannot move axially, so the inner screw rotates out of the outer screw in the axial direction, thereby pushing the piston to move upward to press out the liquid medicine in the medicine tank.

[0027] In the second stage, the swing arm rotates in a second direction under the action of a second driving force until it stops when it reaches the limiting module. In this process, since the group wheel is fixed under the action of the one-way stop module, the swing arm drives the pushing module to rotate beyond the group wheel, and the outer screw and the inner screw cannot rotate, so the outer screw rotates out of the connecting arm in the axial direction, driving the group wheel and the inner screw to move upward in the axial direction, thereby pushing the piston to move upward to press out the liquid medicine in the medicine tank. The first direction is clockwise or counterclockwise, and the second direction is opposite to the first direction.

[0028] In the third stage, the swing arm rotates in a first direction under the action of a third driving force until it stops when it reaches the limiting module. In this process, the swing arm drives the pushing module to rotate, the second pushing piece pushes the second ratchet, and the group wheel and the outer screw rotate in the first direction. Since the base is fixed, the swing arm and the outer screw cannot move axially, so the inner screw rotates out of the outer screw in the axial direction, thereby pushing the piston to move upward to press out the liquid medicine in the medicine tank.

[0029] In the fourth stage, the swing arm rotates in a second direction under the action of a fourth driving force until it stops when it reaches the limiting module. In this process, since the group wheel is fixed under the action of the one-way stop module, the swing arm drives the pushing module to rotate beyond the group wheel, and the outer screw and the inner screw cannot rotate, so the outer screw rotates out of the connecting arm in the axial direction, driving the group wheel and the inner screw to move upward in the axial direction, thereby pushing the piston to move upward to press out the liquid medicine in the medicine tank.

[0030] The first stage and the fourth stage are repeated until the piston reaches the top of the medicine tank and stops working.

[0031] Further preferably, a limiting groove is provided between the first ratchet and the second ratchet; the pushing module further comprises a limiting piece arranged in the limiting groove, which axially limits the pushing module during device operation through the cooperation of the limiting groove and the limiting piece.

[0032] Further preferably, the set of gears further comprises a cam disposed between the first and second ratchets, the cam having a diameter greater than the first and second ratchets; and the cam is disposed between the first and second pushers for axially limiting the pusher module during operation of the device.

[0033] Preferably, the first and second ratchets have the same number of teeth, and the teeth of the first and second ratchets are staggered.

[0034] The reciprocating cycle driven drug injection device provided by the embodiments of the present application adopts a double swing arm and double screw structure, has strong stability, compact structure and small volume, and is convenient to carry; the double ratchet arrangement can realize precise injection of a drug dose, and users can inject different doses of liquid medicine according to requirements, thereby meeting the requirements of users with different doses. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic diagram of a drug injection device provided by an embodiment of the present application;

[0036] Figure 2 FIG. 2 is an exploded schematic diagram of a drug injection device provided by an embodiment of the present application;

[0037] Figure 3 FIG. 3 is a partial structural schematic diagram of a drug injection device provided by an embodiment of the present application;

[0038] Figure 4 FIG. 4 is a partial exploded schematic diagram of a drug injection device provided by an embodiment of the present application;

[0039] Figure 5 FIG. 5 is another partial structural schematic diagram of a drug injection device provided by an embodiment of the present application;

[0040] Figure 6 FIG. 6 is a top view of a drug injection device provided by an embodiment of the present application in a first and third stage working process;

[0041] Figure 7 FIG. 7 is a schematic diagram of a set of gears in a first stage working process provided by an embodiment of the present application;

[0042] Figure 8 FIG. 8 is a front view of a drug injection device provided by an embodiment of the present application in a first and third stage working process;

[0043] Figure 9 FIG. 9 is a top view of a drug injection device provided by an embodiment of the present application in a second and fourth stage working process;

[0044] Figure 10A schematic view of a group wheel in the second and fourth stage working process provided by the embodiment of the present application;

[0045] Figure 11 A front view of a drug injection device in the second and fourth stage working process provided by the embodiment of the present application;

[0046] Figure 12 A schematic view of a group wheel in the third stage working process provided by the embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solutions of the present application are described in further detail below by means of the accompanying drawings and embodiments.

[0048] Figure 1 A schematic view of the structure of a drug injection device provided by the embodiment of the present application, Figure 2 An exploded schematic view of a drug injection device provided by the embodiment of the present application, Figure 3 A schematic view of the structure of a drug injection device provided by the embodiment of the present application, Figure 4 An exploded schematic view of a drug injection device provided by the embodiment of the present application, in combination with Figures 1 to 4 the embodiment of the present application provides a reciprocating cycle driven drug injection device, which comprises a swing module 11, two push modules 12, a rotating module 13, a one-way stop module 14, a limiting module 15, an inner screw 16, a piston 17 and a medicine tank 18. The structure of each part of the device will be described in detail below.

[0049] The swing module 11 functions to receive an external driving force to produce a swing, thereby driving the push module 12. The swing module 11 can specifically comprise two first guide rails 111, two swing arms 112, a connecting arm 113 and a base 114; wherein the first guide rail 111 is arranged on the inner side of the swing arm 112, and the top end of the two first guide rails 111 and the two swing arms 112 is fixed on the connecting arm 113, and the bottom end is fixed on the base 114. It can be understood that the connecting arm 113 and the base 114 function to connect the two swing arms 112 and fix the two first guide rails 111. Further, the middle of the connecting arm 113 is provided with a through hole, and the through hole is provided with a thread; the two swing arms 112 are symmetrical structures, making the input more stable, and at the same time, supporting effect is achieved.

[0050] It should be noted that the source of the external driving force described above can be applied by the user or generated by a power module, including but not limited to a drive motor, a drive wire, in the present embodiment, the power module is two drive wires 19, which are connected to two swing arms 112 respectively, for generating driving force to drive the swing arms 112 to rotate, when the device is not working, the drive wire 19 is in a relaxed state, when the device is working, the drive wire 19 is in a contracted state. In a preferred embodiment, the drive wire 19 here can be a drive wire, when the device is working, the two drive wires are powered alternately, the electric wire changes from a relaxed state to a contracted state to generate driving force, driving the swing arms 112 to rotate.

[0051] Two push modules 12 are used to drive the rotation module 13 to rotate. The two push modules 12 are respectively sleeved on the two first guide rails 111 and can move axially along the first guide rails 111. Since the first guide rails 111 are arranged on the inner side of the swing arms 112, the swing arms 112 form a push module limiting surface, thereby limiting the push module 12 when the swing arms 112 rotate. In the present embodiment, the push module 12 can specifically include a first push piece 121 and a second push piece 122, which are arranged alternately up and down.

[0052] It can be understood that the number of push modules 12 is the same as the number of swing arms 112, and those skilled in the art can select and set the number of push modules 12 and the number of swing arms 112 as needed.

[0053] The rotation module 13 specifically includes a group wheel 131 and an outer screw 132. The group wheel 131 here includes a first ratchet wheel 1311 and a second ratchet wheel 1312 arranged alternately up and down and fixedly connected. The first push piece 121 is connected to the first ratchet wheel 1311, and the first ratchet wheel 1311 is driven by the first push piece 121. The second push piece 122 is connected to the second ratchet wheel 1312, and the second ratchet wheel 1312 is driven by the second push piece 122. In the present embodiment, the first ratchet wheel 1311 and the second ratchet wheel 1312 have the same number of teeth, and the teeth of the first ratchet wheel 1311 and the second ratchet wheel 1312 are arranged alternately to cooperate with the two push modules 12. It should be understood that when the swing arms 112 rotate in one direction, the first push piece 121 and the second push piece 122 work alternately, the first push piece 121 drives the first ratchet wheel 1311 to rotate one tooth, then the second push piece 122 drives the second ratchet wheel 1312 to rotate one tooth, completing one alternation. After that, the first push piece 121 drives the first ratchet wheel 1311 to rotate one tooth, then the second push piece 122 drives the second ratchet wheel 1312 to rotate one tooth, completing the second alternation, and thus the alternation is repeated.

[0054] In a preferred embodiment, to ensure the stability of the device during operation, the push module 12 is axially limited, and a limiting groove is provided between the first ratchet 1311 and the second ratchet 1312; the push module 12 also includes a limiting member 123, which is disposed in the limiting groove. When the device is working, the push module 12 is axially limited by the cooperation of the limiting groove and the limiting member 123. Specifically, when the set wheel 13 rotates in the horizontal direction, it can ensure that the push module 12 does not move axially. When the set wheel moves axially, it can drive the push module 12 to move axially on the first guide rail 111.

[0055] In another preferred embodiment, to ensure the stability of the device during operation, the aforementioned limit switch can also take other forms, specifically as follows: Figure 5 As shown, the assembly wheel 131 also includes a cam 1313, which is disposed between the first ratchet 1311 and the second ratchet 1312. The diameter of the cam 1313 is larger than the diameter of the first ratchet 1311 (second ratchet 1312). Furthermore, the cam 1313 is disposed between the first push plate 121 and the second push plate 122, and is used to axially limit the push module when the device is working. The limiting process is similar to that in the above embodiment, and will not be described again here.

[0056] It is understood that the number of push plates in the aforementioned push module 12 is the same as the number of ratchet wheels in the gear set 131, and the number can be two or more. Those skilled in the art can select and set the number of push plates and ratchet wheels as needed.

[0057] The outer screw 132 is vertically fixed to the assembly wheel 131. It is understood that when the assembly wheel 131 rotates, it will drive the outer screw 132 to rotate as well. Furthermore, the outer screw 132 has an external thread on its outer side, which is screwed into the through hole of the connecting arm 113, thereby enabling relative movement between the outer screw 132 and the connecting arm 113. Further, the outer screw 132 has a through hole inside, with an internal thread for screwing into the inner screw 16, thereby enabling relative movement between the outer screw 132 and the inner screw 16.

[0058] The one-way stop module 14 is connected to the set wheel 131 and its function is to control the set wheel 131 to rotate in one direction. The one-way stop module here includes, but is not limited to, the one-way stop plate 142.

[0059] The limiting module 15 is used to limit the swing arm 112, and the swing arm 112 stops rotating when it rotates to the limiting module 15. In the embodiment, the limiting module 15 is arranged on one side of the swing module 11, and can be a limiting block with a thickness to limit the two swing arms 112, or can be two limiting units to limit the two swing arms 112 respectively. In a specific example, the limiting module 15 can include a first limiting base 151 and a second limiting base 152, the limiting bases generate limiting surfaces, the first limiting base 151 is used to limit the right swing arm 112, and the right swing arm 112 stops rotating when it rotates to the limiting surface; and the second limiting base 152 is used to limit the left swing arm 112, and the left swing arm 112 stops rotating when it rotates to the limiting surface.

[0060] The inner screw rod 16 is arranged in the outer screw rod 132 and is screwed with the inner thread of the outer screw rod 132, and can be rotated out of the outer screw rod 132 in the axial direction upward or rotated into the outer screw rod 132 downward, so that the axial dimension of the device can be greatly reduced, the structure is more compact, and the space inside the device is released to provide convenience for the user.

[0061] The piston 17 is fixedly connected with the top end of the inner screw rod 16 and moves along the axial direction upward or downward with the inner screw rod 16. It can be understood that, since the piston 17 is fixedly connected with the top end of the inner screw rod 16, the piston 17 moves with the inner screw rod 16 and does not rotate.

[0062] The medicine tank 18 is used to load medicine liquid and is sleeved on the piston 17, and the upward movement of the piston 17 can press out the medicine liquid in the medicine tank 18. The medicine liquid herein includes but is not limited to insulin, glucagon, antibiotics, nutrient solution, analgesic, morphine, anticoagulant, gene therapy drug, cardiovascular drug or chemotherapy drug, etc.

[0063] In the preferred embodiment, in order to realize the stability of the device, the device further includes a first support 20, and 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. The rotating shaft is preferably arranged at the center position of the base 114.

[0064] Further, in order to facilitate the user to carry and improve the stability of the device, the device further includes a back plate 21 and a second support 22, as shown in Figures 1 to 3 The back plate 21 is fixedly connected with the side surface of the first support 20, and the second support 22 is fixed between the connecting arm 113 and the back plate 21, so that the top and bottom of the device are fixed on the back plate 21 to realize the stability of the structure.

[0065] In a more preferable embodiment, the one-way stop module 14 can specifically include a second guide rail 141 and a stop piece 142; wherein 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, thereby realizing the up and down fixation of the second guide rail 141, and thus realizing the stability of the one-way stop module 14 during work; the stop piece 142 is sleeved on the second guide rail 141, can move axially along the second guide rail 141, and the stop piece 142 is in connection with the group wheel 131, controls the one-way rotation of the group wheel 131, and the stop piece 142 here is preferably two, respectively controls the one-way rotation of the first ratchet 1311 and the second ratchet 1312.

[0066] On the basis of understanding the structure of the reciprocating cycle driven drug injection device provided by the embodiments of the present application, the working process of the device will be specifically described in combination with the above structure.

[0067] The working process of the drug injection device provided by the embodiments specifically includes four stages:

[0068] The first stage, as shown in Figure 6 , 7 and 8, the swing arm 112 rotates in the first direction under the action of the first driving force, and stops until the swing arm 112 rotates to the limiting module 15, in this process, the swing arm 112 drives the pushing module 12 to rotate, the first pushing piece 121 pushes the first ratchet 1311, drives the group wheel 131 and the outer screw 132 to rotate in the first direction, because the base 114 is fixed, the swing arm 112 and the outer screw 132 cannot move axially, so the inner screw 16 rotates out of the outer screw 132 in the axial direction, thereby pushing the piston 17 to move upward to press out the liquid medicine in the medicine tank 18.

[0069] The second stage, as shown in Figure 9 , 10 and 11, the swing arm 112 rotates in the second direction under the action of the second driving force, and stops until the swing arm 112 rotates to the limiting module 15, in this process, because the group 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 beyond the group wheel 131, the outer screw 132 and the inner screw 16 cannot rotate, so the outer screw 132 rotates out of the connecting arm 113 in the axial direction, drives the group 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 time, the swing arm 112 completes the first reciprocating action.

[0070] The third stage, as shown in Figure 6 , 8As shown in FIG. 12, similar to the first stage, the difference is that the working area of the third stage group wheel 131 is on the second ratchet wheel 1312, and the specific process is as follows: the swing arm 112 rotates in the first direction under the action of the third driving force, and stops when the swing arm 112 rotates to the limiting module 15, in the process, the swing arm 112 drives the pushing module 12 to rotate, the second pushing piece 122 pushes the second ratchet wheel 1312, drives the group wheel 131 and the outer screw 132 to rotate in the first direction, because the base 114 is fixed, the swing arm 112 and the outer screw 132 cannot move axially, so the inner screw 16 rotates out of the outer screw 132 in the axial direction, thereby pushing the piston 17 to move upward to press out the liquid medicine in the medicine tank 18.

[0071] As shown in FIG. 11, similar to the second stage, the specific process is as follows: the swing arm 112 rotates in the second direction under the action of the fourth driving force, and stops when the swing arm 112 rotates to the limiting module 15, in the process, because the group 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 beyond the group wheel 131, the outer screw 132 and the inner screw 16 cannot rotate, so the outer screw 132 rotates out of the connecting arm 113 in the axial direction, drives the group 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 time, the swing arm 112 completes the second reciprocating action, and the entire device completes a cycle. Figure 9 、 10 As shown in FIG. 11, similar to the second stage, the specific process is as follows: the swing arm 112 rotates in the second direction under the action of the fourth driving force, and stops when the swing arm 112 rotates to the limiting module 15, in the process, because the group 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 beyond the group wheel 131, the outer screw 132 and the inner screw 16 cannot rotate, so the outer screw 132 rotates out of the connecting arm 113 in the axial direction, drives the group 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 time, the swing arm 112 completes the second reciprocating action, and the entire device completes a cycle.

[0072] The first stage and the fourth stage are cycled until the piston 17 reaches the top of the medicine tank 18 to stop working.

[0073] It should be noted that 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 according to needs.

[0074] Further, the rotation angle of the swing arm 112 in the first stage, the second stage, the third stage and the fourth stage is the same, that is, the size of the first driving force, the second driving force, the third driving force and the fourth driving force is the same, in order to facilitate stage description, they are respectively distinguished by first, second, third and fourth, it can be understood that the direction of the first driving force and the third driving force is the same, and the direction of the second driving force and the fourth driving force is the same.

[0075] It is understandable that the amount of medicine dispensed each time is determined by the upward displacement of the piston 17. The upward displacement of the piston 17 is related to the rotation angle of the swing arm 112, the number of teeth and rotation angle of the gear 131, the thread pitch of the outer screw 132, the inner screw 16, and the through hole of the connecting arm 113. For example, the more teeth the gear 131 has, the smaller the rotation angle produced each time, and the smaller and more accurate the dosage of medicine dispensed each time. Therefore, those skilled in the art can set the rotation angle of the swing arm 112, the number of teeth and rotation angle of the gear 131, the outer screw 132, the inner screw 16, and the thread pitch of the through hole of the connecting arm 113 according to the needs of each dosage of medicine dispensed.

[0076] To better understand the working process of this device, a specific embodiment will be used for illustration below. In this embodiment, the driving force comes from the driving wire 19, each ratchet has 50 teeth, and the limiting base is set to a limiting rotation angle of 3.6°.

[0077] Phase 1, such as Figure 6 , 7 As shown in Figure 8, when the right drive wire 19 is energized, it contracts to generate driving force, which pushes the right swing arm 112 to drive the swing module 11 to rotate clockwise. When the right swing arm 112 rotates 3.6° clockwise and reaches the limiting surface of the first limiting base 151, it stops rotating. At the same time, the swing arm limits the pushing module 12 through the limiting surface of the pushing module 12. During this process, the swing arm 112 drives the pushing module 12 to rotate. The first pushing plate 121 pushes the first ratchet 1311 to rotate one tooth clockwise, thereby driving the set wheel 131 and the outer screw 132 to rotate clockwise. Since the base 114 is axially fixed, the swing arm 112 and the outer screw 132 cannot move axially. Therefore, the inner screw 16 rotates upward axially from the outer screw 132, thereby pushing the piston 17 to move upward and press out the liquid medicine in the medicine tank 18.

[0078] The second stage, such as Figure 9 , 10 As shown in Figure 11, when the left-hand drive wire 19 is energized, it contracts to generate driving force, pushing the left swing arm 112 to rotate the swing module 11 counterclockwise. The left swing arm 112 stops rotating when it reaches the limiting surface of the second limiting base 152 after rotating 3.6° counterclockwise. Simultaneously, the swing arm limits the pushing module 12 via the limiting surface. During this process, because the set wheel 131 is fixed by the one-way stop plate 142, the swing arm 112 drives the pushing module 12 to rotate past the set wheel 131. At the same time, the outer screw 132 and the inner screw 16 cannot rotate. Therefore, the outer screw 132 screws upward axially from the connecting arm 113, driving the set wheel 131 and the inner screw 16 to move upward axially, thereby pushing the piston 17 upward to expel the liquid medicine from the medicine container 18. At this point, the swing arm 112 completes its first reciprocating motion.

[0079] The third stage, such as Figure 6 , 8 As shown in Figure 12, similar to the first stage, the difference lies in that the working area of ​​the third stage gear 131 is on the second ratchet 1312. The specific process is as follows: the right drive wire 19 is energized, the right drive wire 19 contracts to generate driving force, pushing the right swing arm 112 to drive the swing module 11 to rotate clockwise. When the right swing arm 112 rotates 3.6° clockwise and reaches the limiting surface of the first limiting base 151, it stops rotating. At the same time, the swing arm pushes the limiting surface of the pushing module 12 to push the push module 12 to push the push module 11 to push the push module 12 to push the push module 13 ... The moving module 12 is limited. During this process, the swing arm 112 drives the push module 12 to rotate. The second push plate 122 pushes the second ratchet 1312 to rotate one tooth clockwise, thereby driving the set wheel 131 and the outer screw 132 to rotate clockwise. Since the base 114 is axially fixed, the swing arm 112 and the outer screw 132 cannot move axially. Therefore, the inner screw 16 rotates upward axially from the outer screw 132, thereby pushing the piston 17 to move upward and press out the medicine liquid in the medicine tank 18.

[0080] The fourth stage, such as Figure 9 , 10 As shown in Figure 11, the process is the same as in the second stage, specifically as follows: The left drive wire 19 is energized, causing it to contract and generate driving force, pushing the left swing arm 112 to rotate the swing module 11 counterclockwise. When the left swing arm 112 rotates 3.6° counterclockwise and reaches the limiting surface of the second limiting base 152, it stops rotating. Simultaneously, the swing arm limits the pushing module 12 via the limiting surface. During this process, because the set wheel 131 is fixed by the one-way stop plate 142, the swing arm 112 drives the pushing module 12 to rotate past the set wheel 131. At the same time, the outer screw 132 and the inner screw 16 cannot rotate. Therefore, the outer screw 132 rotates axially upwards from the connecting arm 113, driving the set wheel 131 and the inner screw 16 to move axially upwards, thereby pushing the piston 17 upwards to expel the liquid medicine from the medicine container 18. At this point, the swing arm 112 completes its first reciprocating motion. At this point, the swing arm 112 completes its second reciprocating motion, and the entire device completes one cycle.

[0081] The cycle repeats through the first and fourth stages, which involves alternately energizing the left and right drive wires 19 until the piston 17 reaches the top of the medicine container 18 and stops working. It should be noted that during use, the user can control the number of stages of the device's operation by adjusting the required dosage. For example, each stage corresponds to a 1ml output volume of medicine. If the dosage is 1ml each time, the device will operate for one stage; if the dosage is 3ml each time, the device will operate for three stages, thereby achieving precise control of the dosage.

[0082] The reciprocating cycle driven medicine injection equipment provided by the embodiment of the application adopts a double-swing-arm and double-screw structure, is strong in stability, compact in structure, small in size and convenient to carry; the double-ratchet wheel arrangement can realize accurate injection of a dose of medicine, and users can inject different doses of medicine liquid according to requirements, thereby meeting the requirements of users with different doses.

[0083] In the present application, the term "a plurality of" means two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0085] In the description of the present application, the terms "one specific embodiment", "some embodiments", "one embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative expression of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the present application, and it should be understood that the above description is only a specific embodiment of the present application and does not limit the protection scope of the present application, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A reciprocating cycle-driven drug injection device, characterized in that, The device includes: The swing module includes two first guide rails, two swing arms, a connecting arm, and a base; wherein, the first guide rails are disposed on the inner side of the swing arms, and the top ends of the two first guide rails and the two swing arms are fixed to the connecting arm, and the bottom ends are fixed to the base; the connecting arm has a through hole in the middle. Two push modules are respectively sleeved on the two first guide rails and can move along the axial direction of the first guide rails; each push module includes a first push plate and a second push plate; The rotating module includes a set of wheels and an external screw; wherein, the set of wheels includes a first ratchet and a second ratchet that are staggered and fixedly connected, the first ratchet being driven by a first push plate, and the second ratchet being driven by a second push plate; the external screw is vertical and fixed on the set of wheels, and the external screw is provided with an external thread and an internal thread, the external thread being screwed into the through hole of the connecting arm; A one-way stop module is connected to the set of wheels to control the set of wheels to rotate in one direction; A limiting module limits the swing arm, and stops the rotation when the swing arm rotates to the limiting module. An internal threaded rod is disposed inside the external threaded rod and is threaded to the internal thread of the external threaded rod; The piston is fixedly connected to the top end of the inner screw; A medicine container, used to hold liquid medicine, is fitted onto the piston. The upward movement of the piston can push out the liquid medicine from the medicine container.

2. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The limiting module includes a first limiting base and a second limiting base; When the swing arm rotates to the first limiting base, it stops rotating; When the swing arm rotates to the second limiting base, it stops rotating.

3. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The device also includes two drive wires, which are respectively connected to the two swing arms for driving the swing arms to rotate.

4. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The device also includes a first support, and the base is fixed to the first support by a pivot.

5. The reciprocating cycle-driven drug injection device according to claim 4, characterized in that, The device also includes a back plate and a second support; The back plate is fixedly connected to the side of the first support; The second support is fixed between the connecting arm and the back plate.

6. The reciprocating cycle-driven drug injection device according to claim 5, characterized in that, The one-way stop module includes a second guide rail and a stop plate; The top end of the second guide rail is fixed to the second support, and the bottom end is fixed to the first support. The stop plate is sleeved on the second guide rail and connected to the set of wheels, controlling the set of wheels to rotate in one direction.

7. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The operation of the drug infusion device includes: In the first stage, the swing arm rotates along the first direction under the action of the first driving force until it stops when it reaches the limit module. During this process, the swing arm drives the push module to rotate. The first push plate pushes the first ratchet, which drives the set wheel and the outer screw to rotate along the first direction. Since the base is fixed, the swing arm and the outer screw cannot move axially. Therefore, the inner screw rotates upward axially from the outer screw, thereby pushing the piston to move upward and press out the liquid medicine in the medicine tank. In the second stage, the swing arm rotates along the second direction under the action of the second driving force until it stops when it reaches the limit module. During this process, since the set wheel is fixed under the action of the one-way stop module, the swing arm drives the push module to rotate past the set wheel. The outer screw and inner screw cannot rotate. Therefore, the outer screw rotates out of the connecting arm axially upward, driving the set wheel and inner screw to move axially upward, thereby pushing the piston to move upward and press out 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 the third driving force until it stops when it reaches the limit module. During this process, the swing arm drives the push module to rotate, and the second push plate pushes the second ratchet, which drives the set wheel and the outer screw to rotate along the first direction. Since the base is fixed, the swing arm and the outer screw cannot move axially. Therefore, the inner screw rotates upward axially from the outer screw, thereby pushing the piston to move upward and press out the liquid medicine in the medicine tank. In the fourth stage, the swing arm rotates along the second direction under the action of the fourth driving force until it stops when it reaches the limit module. During this process, since the set wheel is fixed under the action of the one-way stop module, the swing arm drives the push module to rotate past the set wheel. The outer screw and inner screw cannot rotate. Therefore, the outer screw rotates out of the connecting arm axially upward, driving the set wheel and inner screw to move axially upward, thereby pushing the piston to move upward and press out the liquid medicine in the medicine tank. The cycle continues through the first and fourth stages until the piston reaches the top of the medicine container and stops working.

8. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, A limiting groove is provided between the first ratchet and the second ratchet; the pushing module also includes a limiting member disposed in the limiting groove, which, when the device is working, limits the pushing module axially through the cooperation of the limiting groove and the limiting member.

9. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The wheel assembly also includes a cam disposed between the first ratchet and the second ratchet, the cam having a diameter larger than the first ratchet and the second ratchet; and the cam being disposed between the first push plate and the second push plate, for axially limiting the push module when the device is in operation.

10. The reciprocating cycle-driven drug injection device according to claim 1, characterized in that, The first ratchet and the second ratchet have the same number of teeth, and the teeth of the first ratchet and the second ratchet are staggered.

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