Infusion pump

Abstract

The invention discloses an infusion pump, and relates to the technical field of medical instruments. The infusion pump comprises a shell, a medicine storage unit, a driving unit and a needle inserting unit. The shell comprises an upper cover body and a lower cavity body which are buckled with each other, and a liquid inlet penetrating through the upper cover body in the first direction is formed in one side of the upper cover body; the medicine storage unit comprises a medicine bag isolation part and a medicine storage bag, the medicine bag isolation part is located at the liquid inlet and is provided with a liquid inlet channel, and the medicine storage bag is communicated with the liquid inlet channel. The driving unit is provided with a driving rod connected with the medicine storage bag and is configured to be capable of driving the driving rod to compress or stretch the medicine storage bag; the needle inserting unit is communicated with the liquid inlet channel and is provided with a liquid path converter and an injection part which are connected with each other, and a conversion liquid path and a sealing valve element inserted into the conversion liquid path are arranged in the liquid path converter. By adopting the technology provided by the invention, the axial space of the infusion pump can be saved, and the pump body is lighter.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an infusion pump. Background Art

[0002] An infusion pump is an infusion device used to ensure that drugs, liquids or nutrients enter the patient's body safely in precise doses. With the infusion pump, drugs (such as insulin) can be infused into the human body at a specific speed and dose within the required time. However, current infusion pumps generally adopt the piston push rod principle, resulting in a relatively large axial volume. For example, if it is necessary to push the liquid medicine with a length of A, the piston push rod needs to extend out of the medicine cylinder by at least a distance of length A. Therefore, the size of the pump body (including the medicine cylinder and the piston push rod) is at least 2A in length in the axial direction (the moving direction of the piston push rod).

[0003] Based on this, European Patent Document (EP3675932B1) discloses a micro-patch pump for insulin delivery and its auxiliary equipment. The device is configured with a reusable part (RP) for inserting the drug delivery patch pump, and a disposable part (DP) for aligning the RP and the drug delivery patch. Among them, the doser plunger can be configured to move back and forth through the RP drive unit. The injection process is as follows: when the dispenser plunger moves backward, insulin can be delivered through the reservoir and the dispenser catheter into the dispenser. When the dispenser plunger moves forward, insulin can be delivered from the dispenser through the outlet catheter, discharged from the dispenser, and the port hole, cannula opening and cannula are inserted into the user's body.

[0004] Combined with the drawings of this European patent document, it can be seen that the device needs to be provided with multiple one-way valves (such as the first one-way valve, the second one-way valve, the third one-way valve and the one-way valve, etc.) to achieve the one-way delivery of insulin. And combined with its attached Figure 9 and other diagrams, it can be seen that on the basis of having established a fluid channel with an external insulin vial, the device is also internally provided with a fixed drug reservoir that occupies a large horizontal and vertical space, and components such as a vertically pushable cannula communicated with the reservoir. In other words, combined with the attached Figure 3 drawings of this European patent document, it can be seen that the pump body is relatively thick and still needs to occupy a large space, resulting in a risk of unstable attachment during actual use, and there is still much room for improvement in the drug flow channel and the cannula components for infusing into the human body. Summary of the Invention

[0005] The present invention provides an infusion pump to solve the problem of the relatively large volume of the pump body in the prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is to provide an infusion pump, which includes: a housing, a medicine storage unit, a driving unit, and a needle insertion unit. The housing includes an upper cover body and a lower cavity body that are buckled with each other. Among them, one side of the upper cover body is provided with a liquid inlet that penetrates the upper cover body along a first direction; the medicine storage unit includes a medicine bag isolation part and a medicine storage bag. The medicine bag isolation part is located at the liquid inlet and is provided with a liquid inlet channel, and the medicine storage bag is communicated with the liquid inlet channel.

[0007] The driving unit is provided with a driving rod connected to the medicine storage bag and is configured to be able to drive the driving rod to compress or stretch the medicine storage bag; the needle insertion unit is communicated with the liquid inlet channel and is provided with a liquid path converter and an injection part that are connected to each other. A conversion liquid path and a sealing valve core inserted into the conversion liquid path are provided in the liquid path converter. Among them, the sealing valve core is configured to be able to conduct or isolate the conversion liquid path from the injection part.

[0008] The beneficial effects brought by the technical solution provided by the present invention compared with the prior art are: By setting a driving rod to drive the medicine storage bag to perform a contraction action, it can be realized that when the medicine bag isolation part is connected to an external medicine bottle, contracting the medicine storage bag can suck the medicine into the medicine storage bag. Among them, the driving unit is provided with a driving rod connected to the medicine storage bag and is configured to be able to drive the driving rod to compress or stretch the medicine storage bag; when the driving rod moves upward, the medicine storage bag is compressed, and when the driving rod moves downward, the medicine storage bag is stretched. Compared with the conventional pump body structure, the above-mentioned cooperation method of the driving rod and the medicine storage bag can remove the conventional piston component and save the setting of the axial space.

[0009] Among them, the sealing valve core is configured to be able to conduct or isolate the conversion liquid path from the injection part to ensure the one-way flow of the medicine during infusion. Specifically, after the medicine storage bag stores the medicine, it is in a stretched state. At this time, the driving rod is located at the lower part of the lower cavity body; when infusion needs to be performed, the sealing valve core conducts the conversion liquid path and the injection part, and the driving rod moves upward until the medicine storage bag is in a contracted state, and the medicine inside the medicine storage bag flows to the injection part and is infused into the body. Compared with the currently conventional pump body, the above-mentioned infusion pump also removes the traditional infusion pipeline, enabling it to greatly save the space occupied axially and laterally, making the pump body more portable during use, and at the same time ensuring that the medicine is infused with accurate dosage and speed.

[0010] In some embodiments, the medicine storage bag further includes a pressing plug that penetrates the bottom of the medicine storage bag along the first direction, and the pressing plug is connected to the driving rod; among them, the medicine bag isolation part is provided with a concave surface on one side facing the medicine storage bag, and the pressing plug has a convex surface that can cooperate with the concave surface.

[0011] With the above technical solution, when the medicine storage sac is in a compressed state, the convex surface of the pressure plug can fit with the concave surface of the medicine sac isolation part, thereby reducing the "dead space" of the medicine storage sac (referring to the residual space where drugs cannot be fully released or utilized due to device design or operation limitations), making the gap between the medicine sac isolation part and the medicine storage sac smaller, and further reducing the residual liquid in the medicine storage sac after the infusion ends, improving the infusion volume accuracy of the liquid medicine.

[0012] In some embodiments, the needle insertion unit further includes a pressing part and a needle insertion base respectively arranged on both sides of the liquid path converter along the second direction. The liquid path converter is fixedly connected to the pressing part and slidably cooperates with the needle insertion base; wherein, the needle insertion base includes a rebound chamber and a first elastic member embedded in the rebound chamber, and one side of the liquid path converter facing the injection part along the second direction is connected to the first elastic member.

[0013] With the above technical solution, through the cooperation of the first elastic member and the liquid path converter, the liquid path converter can be automatically rebounded under the elastic force of the first elastic member after being pressed by the pressing part. Since the first elastic member is located on the side of the liquid path converter where the injection part is arranged, that is, the injection part is correspondingly located in the rebound chamber, the pressing part can drive the injection part to move from the first position to the second position at the same time, and the first elastic member can drive the injection part to rebound from the second position to the first position.

[0014] In some embodiments, the needle insertion base of the needle inserter is further provided with an inclined plane guide rail, and the sealing valve core is provided with a valve head corresponding to the inclined plane guide rail; when the pressing part drives the liquid path converter to fit with the inclined plane guide rail along the second direction, the inclined plane guide rail can press the valve head to make the conversion liquid path communicate with the injection part, so that the liquid medicine can be smoothly infused into the body.

[0015] Furthermore, the liquid path converter is further provided with a side elastic sheet, and the side elastic sheet is located between the pressing part and the sealing valve core along the second direction and abuts against the valve head.

[0016] With the above technical solution, the side elastic sheet pressing against the valve head can ensure that the sealing valve core isolates the conversion liquid path from the injection part, that is, the sealing valve core is in a normally closed state. When the inclined plane guide rail ejects the valve head of the sealing valve core, the other side of the valve head presses against the side elastic sheet and applies a resistance force to the side elastic sheet, causing the side elastic sheet to deform; and when the inclined plane guide rail moves away from the sealing valve core, the deformed side elastic sheet can apply a force to the sealing valve core to isolate the conversion liquid path and the injection part.

[0017] In some embodiments, the liquid circuit converter is also provided with a sealing groove respectively connected to the conversion liquid circuit and the injection part, and the injection part is provided with an injection liquid circuit connected to the conversion liquid circuit; wherein the sealing valve core sleeve is provided with a first sealing ring, the first sealing ring is located in the sealing groove, and the length of the sealing groove is greater than the inner diameter of the injection liquid circuit.

[0018] By adopting the above technical solution, the sealing groove is used as the movable area of ​​the first sealing ring when the sealing valve core is opened and closed, so that the first sealing ring can conduct or isolate the conversion liquid path and the injection part at any time, and prevent the drug solution from leaking during the infusion process. Among them, the use of the first sealing ring can ensure that the upper and lower ends of the conversion liquid path are sealed at the same time, thereby preventing external dust from entering the conversion liquid path.

[0019] In some embodiments, the medicine bag isolation portion is also provided with a liquid outlet nozzle connected to the liquid inlet channel, and the liquid outlet nozzle is connected to the conversion liquid path through an infusion catheter; wherein, the medicine bag isolation portion is also embedded with a medicine bag rubber plug to seal the liquid inlet channel to prevent external dust from entering.

[0020] In some embodiments, the driving rod further comprises a first toggle rod and a second toggle rod spaced apart on both sides of the pin unit; wherein the pin base is spaced apart with a first top sheet and a second top sheet capable of respectively abutting against the first toggle rod and the second toggle rod.

[0021] By adopting the above technical solution, the first toggle rod and the second toggle rod move synchronously when the driving rod moves, so that when the driving rod moves up to a certain height, the first toggle rod and the second toggle rod can press the first top sheet and the second top sheet, so that the needle base is deformed, so that the first elastic member in a compressed state can be released, and then the injection part automatically rebounds, thereby effectively realizing the precise control of the infusion of the drug solution.

[0022] In some embodiments, the driving unit further includes a guide column, an extension block and a second elastic member, the guide column respectively passes through the driving rod and the extension block along the first direction, wherein the second elastic member is sleeved on the guide column.

[0023] And / or, the driving unit further includes a movable handle penetrating through the bottom surface of the lower cavity along the first direction, the movable handle is connected to the driving rod and can drive the driving rod to move along the first direction.

[0024] With the above technical solution, the guide post extends along the first direction and penetrates through the driving rod to stably guide the driving rod. Among them, the second elastic member is sleeved on the guide post, so that when the medicine bag is in a stretched state (that is, the second elastic member is compressed), the second elastic member can lift the extension block and the driving rod, so that the driving rod has a certain elastic reset function. By adding a movable handle, manual operation can be realized, that is, pushing the movable handle can drive the driving rod to compress or stretch the medicine storage bag, so as to suck the liquid medicine.

[0025] In some embodiments, the driving unit further includes a lever and a third elastic member. The lever is rotatably arranged on the inner wall of the lower cavity, and the third elastic member is sleeved on the lever and connected to the inner wall of the lower cavity; among them, the pressing part of the needle inserting unit is provided with a third top piece, and one end of the lever can abut against the third top piece, and the other end abuts against the extension block.

[0026] With the above technical solution, when the extension block moves upward under the elastic force of the second elastic member, one end of the lever can be disengaged from the pressing state with the extension block, and at the same time, the other end of the lever abuts against the third top piece, so that the conversion liquid path and the injection part are in a conducting state, and the driving rod compresses the medicine storage bag under the elastic force of the second elastic member to realize the infusion of the liquid medicine. When the first toggle rod and the second toggle rod touch the needle inserting base, the deformation of the needle inserting base can cause the injection part to automatically bounce back and complete the infusion, realizing the precise control of the infusion volume of the liquid medicine.

[0027] In some embodiments, the driving unit further includes a screw rod and a motor assembly arranged in parallel with the guide post. The screw rod is provided with a gear meshing with the output shaft of the motor assembly; among them, the screw rod penetrates through the extension block along the first direction and is in a spiral fit with the extension block.

[0028] With the above technical solution, the motor assembly drives the screw rod to rotate, drives the extension block to move upward to push the driving rod, and then drives the driving rod to compress the medicine storage bag. Among them, the motor drive can precisely control the moving speed of the driving rod, so as to realize the precise control of the infusion volume and infusion speed of the liquid medicine. Among them, a PCB board is also arranged in the lower cavity to be connected with the motor assembly to realize the driving signal and the interaction with external devices (such as a communication mobile phone). Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, among which: Figure 1It is a schematic perspective sectional view of an embodiment of an infusion pump provided by the present invention; Figure 2 It is a schematic perspective view of an embodiment of an infusion pump provided by the present invention Figure 1 ; Figure 3 It is a sectional view of an embodiment of an infusion pump provided by the present invention Figure 1 ; Figure 4 It is a sectional view of an embodiment of an infusion pump provided by the present invention Figure 2 ; Figure 5 It is a schematic perspective view of an embodiment of an infusion pump provided by the present invention Figure 2 ; Figure 6 It is a schematic perspective view of an embodiment of the needle insertion unit of an infusion pump provided by the present invention Figure 1 ; Figure 7 It is Figure 6 the sectional perspective schematic diagram; Figure 8 It is a schematic perspective view of an embodiment of the needle insertion unit of an infusion pump provided by the present invention Figure 2 ; Figure 9 It is Figure 8 the sectional perspective schematic diagram.

[0030] Figure 10 It is a schematic perspective view of an embodiment of the medicine storage unit of an infusion pump provided by the present invention; Figure 11 It is Figure 10 the sectional schematic diagram; Figure 12 It is Figure 11 the partial enlarged view; Figure 13 It is a sectional view of an embodiment of the medicine storage unit of an infusion pump provided by the present invention; Figure 14 It is Figure 13 the partial enlarged schematic diagram; Figure 15 It is a schematic diagram of the internal structure of an embodiment of an infusion pump provided by the present invention Figure 1 ; Figure 16 It is a partial enlarged schematic diagram of an embodiment of an infusion pump provided by the present invention; Figure 17 It is a schematic perspective view of an embodiment of the drive rod of an infusion pump provided by the present invention; Figure 18 It is a schematic diagram of the internal structure of an embodiment of an infusion pump provided by the present inventionFigure 2 ; Figure 19 The internal structure of an infusion pump provided by the present invention is shown in FIG. Figure 3 ; Figure 20 The internal structure of an infusion pump provided by the present invention is shown in FIG. Figure 4 .

[0031] Figure 21 The internal structure of an infusion pump provided by the present invention is shown in FIG. Figure 5 ; Figure 22 The internal structure of an infusion pump provided by the present invention is shown in FIG. Figure 6 .

[0032] In the figure: 10. Shell; 11. Upper cover; 110. Liquid inlet; 12. Lower cavity; 120. PCB board; 121. Transparent shell; 20. Drug storage unit; 21. Drug capsule isolation part; 210. Liquid inlet channel; 211. Liquid outlet; 212. Drug capsule rubber plug; 213. Concave surface; 22. Drug storage capsule; 220. Extrusion plug; 221. Convex surface; 30. driving unit; 31. driving rod; 310. first toggle rod; 311. second toggle rod; 32. guide column; 33. extension block; 34. second elastic member; 35. movable handle; 36. lever; 37. third elastic member; 38. screw rod; 380. gear; 39. motor assembly; 390. motor; 391. motor bracket; 40. Needle unit; 41. Liquid path converter; 410. Conversion liquid path; 411. Sealing valve core; 4110. Valve head; 4111. First sealing ring; 4112. Second sealing ring; 412. Side spring sheet; 413. Sealing groove; 42. Injection part; 420. Injection liquid path; 43. Pressing part; 430. Third top sheet; 44. Needle base; 440. Rebound chamber; 441. First elastic member; 442. Inclined guide rail; 443. First top sheet; 444. Second top sheet; 50. External medicine bottle; 51. Rubber plug. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] For the convenience of subsequent description, before describing the specific structure of the infusion pump, this application first combinesFigure 2 The first direction (Z), the second direction (X), and the third direction (Y) are defined. Among them, when the infusion pump is placed normally, the first direction is its height direction, such as the Z direction; the second direction is its length direction when the infusion pump is placed normally, such as the X direction; the third direction is its width direction when the infusion pump is placed normally, such as the Y direction. In this application, the first direction (X), the second direction (Z), and the third direction (Y) are perpendicular to each other.

[0035] It can be understood that the perpendicularity in this application is not absolute perpendicularity. The approximate perpendicularity caused by processing errors and assembly errors (for example, the included angle between two structural features is 89.9°) is also within the range of perpendicularity in this application.

[0036] See Figures 1 to 4 as shown Figure 1 which shows a schematic perspective sectional structure diagram of an embodiment of an infusion pump provided by this application; Figure 2 which shows a schematic perspective structure diagram of an embodiment of an infusion pump provided by this application Figure 1 ; Figure 3 which shows a sectional view of an embodiment of an infusion pump provided by this application Figure 1 ; Figure 4 which shows a sectional view of an embodiment of an infusion pump provided by this application Figure 2 ; among them, Figure 1 , Figure 2 and Figure 4 in which the medicine storage bladder 22 is in a compressed state, Figure 3 in which the medicine storage bladder 22 is in a stretched state.

[0037] In some embodiments, the infusion pump includes: a housing 10, a medicine storage unit 20, a driving unit 30, and a needle insertion unit 40. The housing 10 includes an upper cover body 11 and a lower cavity 12 that are buckled with each other. Among them, a liquid inlet 110 penetrating the upper cover body 11 along the first direction is provided on one side of the upper cover body 11. Combining Figure 2 as shown, the upper cover body 11 and the lower cavity 12 are buckled with each other to form a chamber for accommodating internal components (such as the medicine storage unit 20 and the driving unit 30). The liquid inlet 110 is recessed on one side of the upper cover body 11 and can be used to connect with an external medicine bottle 50. As Figure 3 shown, the external medicine bottle 50 can be an ampoule bottle.

[0038] The medicine storage unit 20 includes a medicine bladder isolation part 21 and a medicine storage bladder 22. The medicine bladder isolation part 21 is located at the liquid inlet 110 and is provided with a liquid inlet channel 210. The medicine storage bladder 22 is communicated with the liquid inlet channel 210. Combining Figure 3As shown, one end of the needle body is inserted into the rubber plug 51 of the external medicine bottle 50, and the other end is inserted into the liquid inlet channel 210, that is, the medicine bottle is connected to the medicine storage bag 22. Exemplarily, the medicine storage bag 22 is a compressible medicine bag, which is made of elastic material (such as rubber, silicone, etc.), and the interior is hollow and can be used to store liquid medicine.

[0039] The driving unit 30 is provided with a driving rod 31 connected to the medicine storage bag 22, and is configured to be able to drive the driving rod 31 to compress or stretch the medicine storage bag 22; Figure 1 As shown in FIG. 2 , the medicine storage bag 22 is compressed, and when the driving rod 31 moves downward (as shown in FIG. Figure 3 When the medicine storage bag 22 is stretched, the medicine storage bag 22 is stretched. By switching the medicine storage bag 22 from the compressed state to the stretched state through the driving rod 31, the liquid medicine in the medicine bottle can be sucked into the medicine storage bag 22. Compared with the structure of the traditional injection pump body, the cooperation mode of the driving rod 31 and the medicine storage bag 22 can eliminate the conventional push rod piston component and save the space length in the first direction.

[0040] The needle unit 40 is connected to the liquid inlet channel 210 and is provided with a fluid path converter 41 and an injection unit 42 connected to each other. The fluid path converter 41 is provided with a conversion fluid path 410 and a sealing valve core 411 inserted in the conversion fluid path 410, wherein the sealing valve core 411 is configured to be able to connect or isolate the conversion fluid path 410 and the injection unit 42. Figure 2 As shown, the lower cavity 12 is provided with a through hole so that the injection portion 42 of the needle unit 40 can contact the skin through the through hole, wherein, as shown in FIG. Figure 1 As shown in the shaded portion, a sealing valve core 411 is provided in the needle unit 40 to isolate the injection part 42 when no infusion is performed, thereby ensuring the one-way flow of the drug solution.

[0041] After the medicine storage bag 22 stores the medicine liquid, the medicine storage bag 22 is in a stretched state (eg Figure 3 As shown), at this time, the driving rod 31 is located at the lower part of the lower cavity 12. When infusion is required, the sealing valve core 411 conducts the conversion liquid path 410 and the injection part 42, and the driving rod 31 moves up to the drug storage bag 22 in a contracted state (as shown in FIG. Figure 4 As shown), the amount of the drug solution in the drug storage bag 22 that enters the injection part 42 can be accurately controlled. In some application scenarios, the side of the lower cavity 12 that is connected to the injection part 42 can be covered with a double-sided adhesive tape so that the housing 10 can adhere to the epidermis of the user.

[0042] The above design eliminates the traditional infusion pipeline and can control the infusion metering of the drug solution with extremely high precision. For example, when used in the conventional injection of insulin solution, the above infusion pump is more convenient and has a smaller thickness. It is not easy to fall off when attached to the epidermis, and the driving unit can accurately control the infusion volume each time.

[0043] See alsoFigures 5 to 8 As shown Figure 5 The three-dimensional structural schematic diagram of an embodiment of an infusion pump provided by the present application is shown Figure 2 ; Figure 6 The three-dimensional structural schematic diagram of an embodiment of the needle insertion unit 40 of an infusion pump provided by the present application is shown Figure 1 ; Figure 7 is Figure 6 The sectional three-dimensional schematic diagram; Figure 8 The three-dimensional structural schematic diagram of an embodiment of the needle insertion unit 40 of an infusion pump provided by the present application is shown Figure 2 .

[0044] In some embodiments, the needle insertion unit 40 further includes a pressing portion 43 and a needle insertion base 44 respectively disposed on both sides of the liquid path converter 41 along the second direction. The liquid path converter 41 is fixedly connected to the pressing portion 43 and slidably cooperates with the needle insertion base 44; wherein, the needle insertion base 44 includes a rebound chamber 440 and a first elastic member 441 embedded in the rebound chamber 440, and one side of the liquid path converter 41 facing the injection portion 42 along the second direction is connected to the first elastic member 441.

[0045] In the embodiment of the present application, as combined Figure 5 shown, the pressing portion 43 is set as a button connected to the liquid path converter 41. Among them, the lower cavity 12 is provided with a through hole corresponding to the needle insertion unit 40 so that the pressing portion 43 can protrude from the lower cavity 12. When the user presses the pressing portion 43, the injection portion 42 can be extended along the other side of the lower cavity 12.

[0046] Exemplarily, as combined Figure 6 and Figure 7 shown, the liquid path converter 41 is provided with a sealing plug to isolate the conversion liquid path 410 and the pressing portion 43. At the same time, the pressing portion 43 is provided with a through hole, so that when the needle insertion unit 40 is in the injection state, the internal and external air pressures can be maintained in balance. The outer shell of the liquid path converter 41 slidably cooperates with the needle insertion base 44, and the connection of the first elastic member 441 with the liquid path converter 41 is provided, so that after the liquid path converter 41 is pressed by the pressing portion 43, it can automatically rebound under the elastic force of the first elastic member 441. Since the first elastic member 441 is located on the side of the liquid path converter 41 where the injection portion 42 is provided, that is, the injection portion 42 is correspondingly located in the rebound chamber 440, the pressing portion 43 can simultaneously drive the injection portion 42 to move from the first position (such as Figure 7 shown as being located in the rebound chamber 440) to the second position (such as Figure 8 shown as extending out of the rebound chamber 440), and the first elastic member 441 can drive the injection portion 42 to rebound from the second position to the first position.

[0047] Among them, as combined Figure 6As shown, the pin base 44 is circumferentially provided with a plurality of convex parts (not shown in the figure), and the convex parts can limit the first elastic member 441 in the contracted state, so that the injection part 42 is in the second position. When the pin base 44 deforms, the elastic force of the first elastic member 441 can automatically retract the injection part 42 to the first position. In some application scenarios, the injection part 42 includes a needle body that can be replaced at any time, and the needle body may penetrate the lower cavity 12 to achieve the effects of pressing out and automatic rebounding.

[0048] In some embodiments, in combination with Figure 7 As shown, the liquid path converter 41 is also provided with a sealing groove 413 that communicates with the conversion liquid path 410 and the injection part 42 respectively, and the injection part 42 is provided with an injection liquid path 420 that communicates with the conversion liquid path 410; wherein, the sealing valve core 411 is sleeved with a first sealing ring 4111, the first sealing ring 4111 is located in the sealing groove 413, and the length of the sealing groove 413 is greater than the inner diameter of the injection liquid path 420.

[0049] In the embodiment of the present application, by using the sealing groove 413 as the movable area of the first sealing ring 4111 when the sealing valve core 411 is opened and closed, the first sealing ring 4111 can conduct or isolate the conversion liquid path 410 and the injection part 42 at any time, and prevent the leakage of the liquid medicine during infusion. Among them, using the first sealing ring 4111 can ensure the simultaneous sealing of the upper and lower ends of the conversion liquid path 410, thereby avoiding the entry of external dust into the conversion liquid path 410. Exemplarily, the sealing valve core 411 is also sleeved with a second sealing ring 4112 to form a double-sealing state with the first sealing ring 4111.

[0050] In combination with Figure 9 As shown, Figure 9 For Figure 8 is a sectional three-dimensional schematic diagram. In some embodiments, in combination with Figure 6 As shown, the pin inserter base is also provided with an inclined plane guide rail 442, and the sealing valve core 411 is provided with a valve head 4110 corresponding to the inclined plane guide rail 442; when the pressing part 43 drives the liquid path converter 41 to fit with the inclined plane guide rail 442 in the second direction, the inclined plane guide rail 442 can press the valve head 4110 (as Figure 9 shown), the inclined surface of the inclined plane guide rail 442 is buckled with the inclined surface of the valve head 4110 to push out the sealing valve core 411, so that the conversion liquid path 410 is communicated with the injection part 42, thereby realizing the smooth infusion of the liquid medicine into the body.

[0051] In some embodiments, the liquid path converter 41 is also provided with a side elastic piece 412, and the side elastic piece 412 is located between the pressing part 43 and the sealing valve core 411 in the second direction and abuts against the valve head 4110. In the embodiment of the present application, the abutting of the side elastic piece 412 and the valve head 4110 can ensure that the sealing valve core 411 isolates the conversion liquid path 410 from the injection part 42 (as Figure 7As shown in the figure, the sealing valve core 411 is in a normally closed state. When the inclined plane guide rail 442 pushes out the valve head 4110 of the sealing valve core 411, the other side of the valve head 4110 presses against the side elastic piece 412 and applies a resistance force to the side elastic piece 412, causing the side elastic piece 412 to deform (as shown in Figure 9 ); and when the inclined plane guide rail 442 moves away from the sealing valve core 411, the deformed side elastic piece 412 can apply a force to the sealing valve core 411 to isolate the conversion liquid path 410 and the injection part 42.

[0052] Exemplarily, the side elastic piece 412 is inserted into the liquid path converter 41, and its shape is "U" shaped. However, the shape of the side elastic piece 412 is not limited in this application. For example, it can also be set to an "L" shape. Specifically, the width of the bent part of the side elastic piece 412 is the length by which the sealing valve core 411 protrudes from the injection liquid path 420 when it is in the closed state.

[0053] See Figures 10 to 12 as shown in Figure 10 which shows a schematic perspective view of an embodiment of a medicine storage unit 20 of an infusion pump provided by this application; Figure 11 is Figure 10 a schematic cross-sectional view of Figure 12 is Figure 11 a partial enlarged view of Figure 13 which shows a cross-sectional view of an embodiment of a medicine storage unit 2020 of an infusion pump provided by this application; Figure 14 is Figure 13 a partial enlarged schematic view of part A in

[0054] In some embodiments, the medicine bag isolation part 21 is further provided with a liquid outlet nozzle 211 communicating with the liquid inlet channel 210. The liquid outlet nozzle 211 is conducted with the conversion liquid path 410 through an infusion catheter (not shown in the figure); wherein, the medicine bag isolation part 21 is further embedded with a medicine bag rubber plug 212 to seal the liquid inlet channel 210 and prevent external dust from entering.

[0055] Exemplarily, when the external medicine bottle 50 is connected to the medicine bag isolation part 21, the needle body penetrates through the medicine bag rubber plug 212 and the medicine bottle rubber plug 51 respectively. In some application scenarios, as shown in Figure 12 , a notch is provided at the upper end of the liquid inlet channel 210 to facilitate the input of the liquid medicine. Among them, the liquid outlet nozzle 211 is located at one end of the liquid inlet channel 210. One end of the driving rod 31 is buckled with the clamping part at the bottom of the medicine storage bag 22, so that when the driving rod 31 drives the stretching of the medicine storage bottle, the liquid medicine can be directly input into the medicine storage bag 22 along the external medicine bottle 50.

[0056] In some embodiments, the medicine storage bag 22 further includes a pressing plug 220 penetrating through the bottom of the medicine storage bag 22 along the first direction, as shown in Figure 3As shown, the driving rod 31 can be sleeved on the outer ring side of the extrusion plug 220 ; wherein, the medicine bag isolation part 21 is provided with a concave surface 213 on the side facing the medicine storage bag 22 , and the extrusion plug 220 has a convex surface 221 that can cooperate with the concave surface 213 .

[0057] In the embodiment of the present application, if the drug bag partition 21 and the extrusion plug 220 are set to be in traditional plane contact, there will be a folding distance of the side wall of the drug bag 22 between the compressed drug bag 22 and the drug bag partition 21, that is, a "dead space" (residual space where the drug cannot be completely released or utilized) may be formed. Figure 14 As shown, through the geometrically matched design of the concave surface 213 and the convex surface 221, when the medicine storage bag 22 is in a compressed state, the extrusion plug 220 can move up to the extreme position, and its convex surface 221 is completely in contact with the concave surface 213 of the medicine bag isolation part 21, so as to reduce the "dead space" that may be formed and force the residual medicine liquid to be discharged.

[0058] In some application scenarios, when the infusion pump is used to inject insulin, the design of the squeeze plug 220 and the medicine bag isolation portion 21 can reduce the amount of insulin residue after each infusion, thereby improving the accuracy of insulin infusion and avoiding the user's blood sugar fluctuations due to insulin infusion dosage errors.

[0059] Combination Figure 15 and Figure 16 As shown, Figure 15 The internal structure of an infusion pump according to an embodiment of the present invention is shown in FIG. Figure 1 ; Figure 16 A partially enlarged schematic diagram of an embodiment of an infusion pump provided by the present application is shown.

[0060] In some embodiments, the driving rod 31 also includes a first toggle rod 310 and a second toggle rod 311 spaced apart on both sides of the pin unit 40; wherein the pin base 44 is spaced apart with a first top plate 443 and a second top plate 444 that can respectively abut against the first toggle rod 310 and the second toggle rod 311.

[0061] In the embodiment of the present application, the first toggle rod 310 and the second toggle rod 311 move synchronously when the driving rod 31 moves, so that when the driving rod 31 moves up to a certain height, such as Figures 15 to 16 As shown, the first toggle rod 310 and the second toggle rod 311 press against the first top plate 443 and the second top plate 444 of the pin base 44, so that the pin base 44 is deformed, thereby allowing the first elastic member 441 in a compressed state to be released, and then the injection part 42 automatically rebounds.

[0062] For example, in combination Figure 17 As shown, Figure 17The three-dimensional structural diagram of an embodiment of the driving rod 31 of an infusion pump provided by the present application is shown. The first toggle rod 310 and the second toggle rod 311 are both provided with inclined surfaces, so that when the first top sheet 443 can expand outward along the inclined surface of the first toggle rod 310, the second top sheet 444 can expand outward along the inclined surface of the second toggle rod 311, thereby driving the pin base 44 to deform, so that the first elastic member 441 is no longer first, thereby achieving automatic rebound.

[0063] In some embodiments, the driving unit 30 further includes a movable handle 35 that passes through the bottom surface of the lower cavity 12 along the first direction, and the movable handle 35 is connected to the driving rod 31 and can drive the driving rod 31 to move along the first direction. Figure 1 and Figure 17 As shown, the movable handle 35 can be threadedly matched with the driving rod 31, so that the user can pull the movable handle 35 to achieve the liquid aspiration action of the medicine storage bag 22. In some application scenarios, when the liquid aspiration of the medicine storage bag 22 is completed, the user can rotate the movable handle 35 to remove the movable handle 35 to reduce the vertical length of the infusion pump, and the motor assembly 39 or the lever 36 of the subsequent driving unit 30 drives the driving rod 31 to accurately compress the medicine storage bag 22 to achieve the infusion action.

[0064] Combination Figure 1 , 18 and Figure 19 As shown, Figure 18 The internal structure of an infusion pump provided by the present application is shown in FIG. Figure 2 ; Figure 19 The internal structure of an infusion pump provided by the present application is shown in FIG. Figure 3 In some embodiments, the driving unit 30 further includes a guide column 32 , an extension block 33 , and a second elastic member 34 , wherein the guide column 32 passes through the driving rod 31 and the extension block 33 along the first direction, respectively, and the second elastic member 34 is sleeved on the guide column 32 .

[0065] In the embodiment of the present application, the guide column 32 extends along the first direction and penetrates the driving rod 31 to stably guide the driving rod 31. The second elastic member 34 is sleeved on the guide column 32, so that when the medicine bag is in a stretched state (i.e., the second elastic member 34 is compressed), the second elastic member 34 can lift the extension block 33 and the driving rod 31.

[0066] In some embodiments, the drive unit 30 also includes a screw 38 and a motor assembly 39 arranged parallel to the guide column 32, and the screw 38 is provided with a gear 380 meshing with the output shaft of the motor assembly 39; wherein the screw 38 penetrates the extension block 33 along the first direction and is spirally engaged with the extension block 33.

[0067] In the embodiments of the present application, the motor assembly 39 drives the screw 38 to rotate, driving the extension block 33 to move upward to push the driving rod 31, and further driving the driving rod 31 to compress the medicine storage bag 22. Exemplarily, in combination with Figure 18 As shown, the gear 380 of the output shaft of the motor assembly 39 meshes with the gear 380 of the screw 38, so that when the motor assembly 39 operates, the screw 38 can rotate synchronously with the gear 380. Among them, a U-shaped ring is provided at the bottom of the screw 38 so that the screw 38 can be rotatably fixed to the bottom of the lower cavity 12, and the screw 38 is in threaded cooperation with the extension block 33, so that when the screw 38 rotates clockwise or counterclockwise, it can drive the extension block 33 to move upward and further drive the driving rod 31 to move upward.

[0068] In some application scenarios, the motor assembly 39 includes a motor bracket 391 and a motor 390 fixedly arranged in the lower cavity 12. By driving the motor 390, the moving speed and moving distance of the driving rod 31 can be accurately controlled, so as to accurately control the infusion volume and infusion speed of the liquid medicine.

[0069] Exemplarily, in combination with Figure 19 As shown, a PCB board 120 is further arranged in the lower cavity 12 to be connected to the motor assembly 39. A sensing module and a communication module can be arranged on the PCB board 120, so as to drive signals and interact with external devices (such as a communication mobile phone). For example, the user can control the start of the motor 390 through a dedicated APP, etc.

[0070] See Figures 20 to 22 As shown, Figure 20 shows the internal structure schematic diagram of an embodiment of an infusion pump provided by the present application Figure 4 ; Figure 21 shows the internal structure schematic diagram of an embodiment of an infusion pump provided by the present application Figure 5 ; Figure 22 shows the internal structure schematic diagram of an embodiment of an infusion pump provided by the present application Figure 6 . Among them, Figure 20 and Figure 21 the medicine storage bag 22 is in a compressed state, Figure 22 the medicine storage bag 22 is in a stretched state in

[0071] In some implementation schemes, the driving unit 30 is further provided with a lever 36 and a third elastic member 37. The lever 36 is rotatably arranged on the inner wall of the lower cavity 12. The third elastic member 37 is sleeved on the lever 36 and connected to the inner wall of the lower cavity 12; among them, a third top piece 430 is provided on the pressing part 43 of the needle inserting unit. One end of the lever 36 can abut against the third top piece 430, and the other end can abut against the extension block 33.

[0072] In the embodiment of the present application, when the pressing part 43 does not press the injection part 42, one end of the lever 36 abuts against the extension block 33 (as Figure 22 shown); when the pressing part 43 presses the injection part 42, the conversion liquid path 410 and the injection part 42 are in a conducting state, the third top piece 430 moves downward and abuts against one end of the lever 36 (such as the shorter end), combined with Figure 20 and Figure 21 shown, the shorter end of the lever 36 is stressed, and at the same time, the other end of the lever 36 (such as the longer end) disengages from the pressing state with the extension block 33. The extension block 33 moves upward under the elastic force of the second elastic member 34, and the driving rod 31 compresses the medicine storage bag 22 under the elastic force of the second elastic member 34 to realize the infusion of the liquid medicine. Exemplarily, the third top piece 430 is provided with a bump for abutting against the lever 36. When the first toggle rod 310 and the second toggle rod 311 abut against the needle insertion base 44, the deformation of the needle insertion base 44 can cause the injection part 42 to automatically bounce back to complete the infusion and realize the quantitative infusion of the liquid medicine.

[0073] It should be noted that the above lever 36 and the third elastic member 37 constitute a spring drive system, and the second elastic member 34 is used as its main power source; the above motor assembly 39 and the screw 38 constitute a motor drive system. At this time, the motor 390 is used as the main power source, and the second elastic member 34 can assist it. In some application scenarios, the user can select the above two independent mechanical drive methods according to actual needs. For example, when higher accuracy requirements for the infusion speed are required, the motor drive system can be selected.

[0074] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall fall within the protection scope of the present invention.

Claims

1. An infusion pump, characterized in that: include: A shell, the shell comprising an upper cover body and a lower cavity body that are buckled with each other, wherein one side of the upper cover body is provided with a liquid inlet that penetrates the upper cover body along a first direction; A medicine storage unit, the medicine storage unit comprising a medicine bag isolation part and a medicine storage bag, the medicine bag isolation part is located at the liquid inlet and is provided with a liquid inlet channel, the medicine storage bag is communicated with the liquid inlet channel; a driving unit, the driving unit being provided with a driving rod connected to the medicine storage bag and being configured to be able to drive the driving rod to compress or stretch the medicine storage bag; A needle unit is connected to the liquid inlet channel and is provided with a liquid circuit converter and an injection part which are interconnected. A conversion liquid circuit and a sealing valve core inserted in the conversion liquid circuit are provided in the liquid circuit converter, wherein the sealing valve core is configured to be able to connect or isolate the conversion liquid circuit and the injection part.

2. The infusion pump according to claim 1, characterized in that: The medicine storage bag also includes an extrusion plug that penetrates the bottom of the medicine storage bag along the first direction, and the extrusion plug is connected to the driving rod; wherein the medicine bag isolation part is provided with a concave surface on one side facing the medicine storage bag, and the extrusion plug has a convex surface that can cooperate with the concave surface.

3. The infusion pump according to claim 1, characterized in that: The needle unit also includes a pressing portion and a pin base respectively arranged on both sides of the liquid circuit converter along the second direction, and the liquid circuit converter is fixedly connected to the pressing portion and slidably cooperates with the pin base; wherein, the pin base includes a rebound chamber and a first elastic member embedded in the rebound chamber, and the liquid circuit converter is connected to the first elastic member along the second direction toward the side of the injection part.

4. The infusion pump according to claim 3, characterized in that: The needle inserter base is also provided with a sloped guide rail, and the sealing valve core is provided with a valve head corresponding to the sloped guide rail; when the pressing portion drives the liquid circuit converter to fit the sloped guide rail along the second direction, the sloped guide rail can press the valve head to make the conversion liquid circuit conductive with the injection portion.

5. The infusion pump according to claim 4, characterized in that: The fluid path converter is further provided with a side spring sheet, which is located between the pressing portion and the sealing valve core along the second direction and abuts against the valve head.

6. The infusion pump according to claim 1, characterized in that: The liquid circuit converter is also provided with a sealing groove respectively connected with the conversion liquid circuit and the injection part, and the injection part is provided with an injection liquid circuit connected with the conversion liquid circuit; wherein, the sealing valve core sleeve is provided with a first sealing ring, the first sealing ring is located in the sealing groove, and the length of the sealing groove is greater than the inner diameter of the injection liquid circuit.

7. The infusion pump according to claim 3, characterized in that: The driving rod further comprises a first toggle rod and a second toggle rod which are arranged at intervals on both sides of the pin unit; wherein the pin base is provided with a first top plate and a second top plate which can respectively abut against the first toggle rod and the second toggle rod.

8. The infusion pump according to any one of claims 1 to 7, characterized in that: The driving unit further comprises a guide column, an extension block and a second elastic member, wherein the guide column respectively penetrates the driving rod and the extension block along the first direction, wherein the second elastic member is sleeved on the guide column; and / or The driving unit further includes a movable handle penetrating the bottom surface of the lower cavity along the first direction, the movable handle is connected to the driving rod and can drive the driving rod to move along the first direction.

9. The infusion pump according to claim 8, characterized in that: The driving unit is also provided with a lever and a third elastic member, the lever is rotatably arranged on the inner wall of the lower cavity, the third elastic member is sleeved on the lever and connected to the inner wall of the lower cavity; wherein the pressing portion of the pin unit is provided with a third top sheet, one end of the lever can abut against the third top sheet, and the other end abuts against the extension block.

10. The infusion pump according to claim 8, characterized in that: The driving unit further comprises a screw rod and a motor assembly arranged in parallel with the guide column, wherein the screw rod is provided with a gear meshing with the output shaft of the motor assembly; wherein the screw rod penetrates the extension block along the first direction and is spirally matched with the extension block.

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