An infusion pump

Abstract

The application discloses an infusion pump and relates to the technical field of medical devices. The infusion pump comprises a shell, a medicine storage unit, a driving unit and a needle unit. The shell comprises an upper cover and a lower cavity which are buckled to each other. One side of the upper cover is provided with a liquid inlet which penetrates the upper cover along a first direction. 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. The medicine storage bag is in communication with the liquid inlet channel. The driving unit is provided with a driving rod connected with the medicine storage bag and is configured to drive the driving rod to compress or stretch the medicine storage bag. The needle unit is in communication with the liquid inlet channel and is provided with a liquid path converter and an injection part which are connected with each other. The liquid path converter is provided with a conversion liquid path and a sealing valve core inserted in the conversion liquid path. By adopting the technology provided by the application, the axial space of the infusion pump can be saved, and the pump body is more portable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an infusion pump. BACKGROUND

[0002] An infusion pump is a kind of infusion device for ensuring that a drug, liquid or nutrient enters the body of a patient in a precise dose, and the drug (such as insulin) can be infused into the human body at a specific speed and dose within a required time by using the infusion pump. However, the current infusion pump generally adopts the principle of a piston push rod, which makes the axial volume of the pump large. For example, if the length of the drug liquid to be pushed is A, the piston push rod needs to be extended at least a distance of A outside the drug cartridge, so that the size of the pump body (including the drug cartridge and the piston push rod) is at least 2A in the axial direction (the movement direction of the piston push rod).

[0003] Therefore, the European patent document (EP3675932B1) discloses a micro patch pump for insulin delivery and an auxiliary device thereof, which is configured to insert a reusable part (RP) of a drug delivery patch pump and align the RP and a disposable part (DP) of the drug delivery patch. The doser plunger can be configured to move back and forth by the RP drive unit. The injection process is as follows: when the doser plunger moves backward, the insulin can be delivered into the doser through the reservoir and the doser conduit. When the doser plunger moves forward, the insulin can be delivered from the doser through the outlet conduit, discharged from the doser, and inserted into the user's body through the port hole, the cannula opening and the cannula.

[0004] As can be seen from the drawings of the European patent document, the device needs to be provided with a plurality of one-way valves (such as a first one-way valve, a second one-way valve, a third one-way valve and a one-way valve) to realize one-way delivery of the insulin. As can be seen from the drawings of the European patent document, Figure 9 As can be seen from the drawings of the European patent document, the device is provided with a fixed drug reservoir occupying a large horizontal and vertical space inside on the basis of having established a fluid channel with an external insulin vial, and a vertically pushable cannula communicating with the drug reservoir. In other words, as can be seen from the drawings of the European patent document, Figure 3 As shown in the drawings of the European patent document, the pump body is thick and still occupies a large space, which causes the risk of unstable attachment in actual use, and the drug flow channel and the cannula part for infusion into the human body still have a large room for improvement. SUMMARY

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

[0006] To solve the above technical problems, the technical scheme adopted by the present application is to provide an infusion pump, which comprises a shell, a medicine storage unit, a driving unit and a needle unit. The shell comprises an upper cover body and a lower cavity which are buckled to each other, wherein one side of the upper cover body is provided with a liquid inlet penetrating through the upper cover body in a first direction; 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 in communication with the liquid inlet channel.

[0007] The driving unit is provided with a driving rod connected with the medicine storage bag and is configured to drive the driving rod to compress or stretch the medicine storage bag; the needle unit is in communication with the liquid inlet channel and is provided with a liquid path converter and an injection part connected with each other, the liquid path converter is provided with a conversion liquid path and a sealing valve core inserted in the conversion liquid path, and the sealing valve core is configured to communicate or isolate the conversion liquid path and the injection part.

[0008] The technical scheme provided by the present application has the following beneficial effects compared with the prior art:

[0009] By setting the driving rod to drive the medicine storage bag to perform the contraction action, the medicine liquid can be sucked into the medicine storage bag when the medicine bag isolation part is connected with the external medicine liquid bottle. The driving unit is provided with a driving rod connected with the medicine storage bag and is configured 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 cooperation mode of the above-mentioned driving rod and the medicine storage bag can remove the conventional piston component and save the axial space.

[0010] The sealing valve core is configured to communicate or isolate the conversion liquid path and the injection part to ensure one-way flow of the medicine liquid during infusion. Specifically, the medicine storage bag is in a stretched state after storing the medicine liquid, and at this time the driving rod is located at the lower part of the lower cavity; when infusion needs to be performed, the sealing valve core communicates the conversion liquid path and the injection part, the driving rod moves upward to the medicine storage bag in a contracted state, and the medicine liquid inside the medicine storage bag flows to the injection part and is infused into the body. Compared with the conventional pump body, the above-mentioned infusion pump also removes the traditional infusion pipeline, which can greatly save the axial and lateral space occupation, making the pump body more portable during use, while ensuring that the medicine is infused at an accurate dose and speed.

[0011] In some embodiments, the medicine storage bag further comprises a pressing plug penetrating through the bottom of the medicine storage bag in the first direction, the pressing plug is connected with the driving rod; wherein the side of the medicine bag isolation part facing the medicine storage bag is provided with a concave surface, and the pressing plug has a convex surface capable of cooperating with the concave surface.

[0012] By adopting the technical scheme, when the medicine storage bag is in a compressed state, the convex surface of the pressurizing plug can be attached to the concave surface of the medicine bag isolation part, thereby reducing the "dead space" of the medicine storage bag, making the gap between the medicine bag isolation part and the medicine storage bag smaller, and further reducing the residual liquid in the medicine storage bag after the infusion is completed, and improving the infusion accuracy of the liquid medicine.

[0013] In some embodiments, the needle unit further comprises a pressing part and a needle base respectively arranged on both sides of the liquid path switcher along a second direction, the liquid path switcher is fixedly connected with the pressing part and is in sliding fit with the needle base; wherein the needle base comprises a rebound chamber and a first elastic member embedded in the rebound chamber, and one side of the liquid path switcher along the second direction towards the injection part is connected with the first elastic member.

[0014] By adopting the technical scheme, through the cooperation of the first elastic member and the liquid path switcher, the liquid path switcher can automatically rebound 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 switcher where the injection part is arranged, that is, the injection part is located in the rebound chamber, the pressing part can simultaneously drive the injection part to move from the first position to the second position, and the first elastic member can drive the injection part to rebound from the second position to the first position.

[0015] In some embodiments, the needle base is further provided with an inclined guide rail, and the sealing valve core is provided with a valve head corresponding to the inclined guide rail; when the pressing part drives the liquid path switcher to attach to the inclined guide rail along the second direction, the inclined guide rail can press the valve head to make the switching liquid path and the injection part conductive, so that the liquid medicine can be smoothly infused into the body.

[0016] Further, the liquid path switcher is further provided with a side elastic sheet, 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.

[0017] By adopting the technical scheme, the abutment of the side elastic sheet and the valve head can ensure that the sealing valve core isolates the switching liquid path and the injection part, that is, the sealing valve core is in a normally closed state. When the inclined guide rail pushes out the valve head of the sealing valve core, the other side of the valve head abuts against the side elastic sheet and applies a resistance force to the side elastic sheet, so that the side elastic sheet deforms; and when the inclined 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 switching liquid path and the injection part.

[0018] In some embodiments, the liquid path converter is further provided with a sealing groove in communication with the conversion liquid path and the injection part, respectively, and the injection part is provided with an injection liquid path in communication with the conversion liquid path; wherein the sealing valve core 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 path.

[0019] By using the above technical scheme, the first sealing ring can be used to guide or isolate the conversion liquid path and the injection part at any time, and prevent the leakage of the drug solution during infusion. The use of the first sealing ring can ensure that the upper and lower ends of the conversion liquid path are simultaneously sealed, thereby preventing dust from entering the conversion liquid path.

[0020] In some embodiments, the drug capsule isolation part is further provided with a liquid outlet nozzle in communication with the liquid inlet channel, and the liquid outlet nozzle is in communication with the conversion liquid path through a liquid infusion catheter; wherein the drug capsule isolation part is further embedded with a drug capsule plug to seal the liquid inlet channel and prevent dust from entering.

[0021] In some embodiments, the drive rod further comprises a first toggle lever and a second toggle lever arranged on both sides of the insertion needle unit; wherein the insertion needle base is provided with a first top piece and a second top piece capable of abutting the first toggle lever and the second toggle lever, respectively.

[0022] By using the above technical scheme, the first toggle lever and the second toggle lever move synchronously when the drive rod moves, so that when the drive rod moves upward to a certain height, the first toggle lever and the second toggle lever can press the first top piece and the second top piece, causing the deformation of the insertion needle base, so that the first elastic member in the compressed state can be released, thereby automatically rebounding the injection part, effectively achieving precise control of the infusion of the drug solution.

[0023] In some embodiments, the drive unit further comprises a guide column, an extension block, and a second elastic member, the guide column penetrates the drive rod and the extension block along the first direction, respectively, and the second elastic member is sleeved on the guide column.

[0024] And / or, the drive unit further comprises a movable handle penetrating the bottom surface of the lower cavity along the first direction, the movable handle is connected with the drive rod and can drive the drive rod to displace along the first direction.

[0025] The technical scheme is adopted, the guide column extends along the first direction and penetrates the driving rod to stably guide the driving rod. The second elastic member is sleeved on the guide column, so that when the medicine bag is in a stretched state (i.e. 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. The manual operation can be realized by additionally arranging the movable handle, i.e. pushing the movable handle can drive the driving rod to realize the compression or stretching of the medicine bag, so as to suck the medicine liquid.

[0026] In some embodiments, the driving unit is further provided with 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 with the inner wall of the lower cavity; wherein the pressing part of the needle 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.

[0027] The technical scheme is adopted, when the extension block moves upward under the elastic force of the second elastic member, one end of the lever can be separated from the abutting pressure state with the extension block, and the other end of the lever abuts against the third top sheet, so that the conversion liquid path and the injection part are in a conductive state, the driving rod compresses the medicine bag under the elastic force of the second elastic member, and the infusion of the medicine liquid is realized. When the first and second driving rods abut against the needle base, the deformation of the needle base can realize the automatic elastic return of the injection part and complete the infusion, and the infusion amount of the medicine liquid is accurately controlled.

[0028] In some embodiments, the driving unit further comprises a screw rod and a motor assembly arranged in parallel with the guide column, 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 screwedly matched with the extension block.

[0029] The technical scheme is adopted, the screw rod is driven to rotate by the motor assembly, the extension block is driven to move upward to push the driving rod, and then the driving rod is driven to compress the medicine bag. The motor drive can accurately control the moving speed of the driving rod, so as to accurately control the infusion amount and infusion speed of the medicine liquid. The PCB board is further arranged in the lower cavity to be connected with the motor assembly, so as to realize the driving signal and the interaction with the external equipment (such as a communication mobile phone). BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0031] Figure 1is a cross-sectional perspective structural schematic view of an embodiment of the infusion pump provided by the present application;

[0032] Figure 2 is a perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 1 ;

[0033] Figure 3 is a cross-sectional perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 1 ;

[0034] Figure 4 is a cross-sectional perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 2 ;

[0035] Figure 5 is a perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 2 ;

[0036] Figure 6 is a perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 1 ;

[0037] Figure 7 is Figure 6 a cross-sectional perspective schematic view;

[0038] Figure 8 is a perspective structural schematic view of an embodiment of the infusion pump provided by the present application Figure 2 ;

[0039] Figure 9 is Figure 8 a cross-sectional perspective schematic view.

[0040] Figure 10 is a perspective structural schematic view of an embodiment of the infusion pump provided by the present application

[0041] Figure 11 is Figure 10 a cross-sectional schematic view;

[0042] Figure 12 is Figure 11 a partial enlarged view;

[0043] Figure 13 is a cross-sectional view of an embodiment of the infusion pump provided by the present application

[0044] Figure 14 is Figure 13 a partial enlarged schematic view;

[0045] Figure 15 is an internal structural schematic of an embodiment of the infusion pump provided by the present applicationFigure 1 ;

[0046] Figure 16 is a partial enlarged view of an embodiment of the infusion pump provided by the present application;

[0047] Figure 17 is a perspective view of an embodiment of the driving rod of the infusion pump provided by the present application;

[0048] Figure 18 is a schematic view of the internal structure of an embodiment of the infusion pump provided by the present application Figure 2 ;

[0049] Figure 19 is a schematic view of the internal structure of an embodiment of the infusion pump provided by the present application Figure 3 ;

[0050] Figure 20 is a schematic view of the internal structure of an embodiment of the infusion pump provided by the present application Figure 4 .

[0051] Figure 21 is a schematic view of the internal structure of an embodiment of the infusion pump provided by the present application Figure 5 ;

[0052] Figure 6 is a schematic view of the internal structure of an embodiment of the infusion pump provided by the present application Figure 1 .

[0053] in the figure:

[0054] 10, housing; 11, upper cover body; 110, liquid inlet; 12, lower cavity; 120, PCB board; 121, transparent shell plate; 20, medicine storage unit; 21, medicine bag isolation part; 210, liquid inlet channel; 211, liquid outlet nozzle; 212, medicine bag rubber plug; 213, concave surface; 22, medicine storage bag; 220, extrusion plug; 221, convex surface;

[0055] 30, driving unit; 31, driving rod; 310, first toggle lever; 311, second toggle lever; 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 support;

[0056] 40, pin unit; 41, liquid path converter; 410, conversion liquid path; 411, sealing spool; 4110, valve head; 4111, first sealing ring; 4112, second sealing ring; 412, side elastic sheet; 413, sealing groove; 42, injection part; 420, injection liquid path; 43, pressing part; 430, third top sheet; 44, pin 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

[0057] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0058] For the convenience of subsequent description, before the specific structure of the infusion pump is described, the present application first defines the first direction (Z), the second direction (X) and the third direction (Y) in combination with Figure 2 The first direction is the height direction when the infusion pump is normally placed, for example, the Z direction; the second direction is the length direction when the infusion pump is normally placed, for example, the X direction; and the third direction is the width direction when the infusion pump is normally placed, for example, the Y direction. In the present application, the first direction (X), the second direction (Z) and the third direction (Y) are perpendicular to each other.

[0059] It can be understood that the perpendicular to each other in the present application is not absolute perpendicular, and the approximate perpendicular (for example, the included angle between two structural features is 89.9°) caused by processing error and assembly error is also within the range of the perpendicular to each other in the present application.

[0060] Referring to Figure 4 , the present application provides a cross-sectional perspective structure schematic diagram of an embodiment of an infusion pump; Figure 3 , the present application provides a cross-sectional perspective structure schematic diagram of an embodiment of an infusion pump; Figure 2 , the present application provides a cross-sectional perspective structure schematic diagram of an embodiment of an infusion pump; Figure 3 ; Figure 3 , the present application provides a cross-sectional perspective structure schematic diagram of an embodiment of an infusion pump; Figure 1 ; Figure 3 , the present application provides a cross-sectional perspective structure schematic diagram of an embodiment of an infusion pump; wherein, Figure 2 , Figure 1 , Figure 3 and Figure 4 the medicine storage bag 22 is in a compressed state, Figure 5 to Figure 8 the medicine storage bag 22 is in a stretched state.

[0061] In some embodiments, the infusion pump comprises a housing 10, a medicine storage unit 20, a driving unit 30 and a needle unit 40. The housing 10 comprises a top cover 11 and a bottom cavity 12 which are buckled to each other, wherein one side of the top cover 11 is provided with a liquid inlet 110 penetrating through the top cover 11 along a first direction. In combination Figure 5 As shown, the top cover 11 and the bottom cavity 12 are buckled to each other to form a cavity for accommodating internal components (such as the medicine storage unit 20 and the driving unit 30), and the liquid inlet 110 is recessed on one side of the top cover 11 and can be used to connect with an external medicine bottle 50, such as Figure 2 As shown, the external medicine bottle 50 can be a vial.

[0062] The medicine storage unit 20 comprises a medicine bag isolation part 21 and a medicine storage bag 22, the medicine bag isolation part 21 is located at the liquid inlet 110 and is provided with a liquid inlet channel 210, and the medicine storage bag 22 is in communication with the liquid inlet channel 210. In combination Figure 6 As 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 in communication with 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 has a hollow interior for storing liquid medicine.

[0063] The driving unit 30 is provided with a driving rod 31 connected with the medicine storage bag 22 and is configured to drive the driving rod 31 to compress or stretch the medicine storage bag 22; when the driving rod 31 moves upward (as shown in Figure 1 When the driving rod 31 moves downward (as shown in Figure 7 The driving rod 31 moves downward (as shown in

[0064] The needle unit 40 is in communication with the liquid inlet channel 210 and is provided with a liquid path converter 41 and an injection part 42 which are connected with each other, the liquid path converter 41 is provided with a conversion liquid path 410 and a sealing valve core 411 inserted into the conversion liquid path 410, wherein the sealing valve core 411 is configured to communicate or isolate the conversion liquid path 410 and the injection part 42. In combination Figure 6 As shown, the bottom cavity 12 is provided with a through hole so that the injection part 42 of the needle unit 40 can pass through the through hole to contact the skin, wherein Figure 8 As shown in the shaded part, the sealing valve core 411 is arranged in the needle unit 40 to isolate the injection part 42 when not infusing, ensuring the one-way flow of the liquid medicine.

[0065] After the medicine storage bag 22 stores the medicine liquid, the medicine storage bag 22 is in a stretched state (eg Figure 2 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). Figure 5 As shown in FIG, the amount of liquid medicine in the medicine reservoir 22 that is infused into the injection portion 42 can be precisely controlled. In some application scenarios, the side of the lower cavity 12 that communicates with the injection portion 42 can be covered with a double-sided adhesive tape to allow the housing 10 to adhere to the user's skin.

[0066] 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 conventional injections of insulin solution, the above infusion pump is more convenient, has a smaller thickness, is not easy to fall off when attached to the epidermis, and can accurately control the infusion volume each time through the drive unit.

[0067] See also Figure 6 As shown, Figure 7 The three-dimensional structure diagram of an embodiment of an infusion pump provided by the present application is shown Figure 7 ; Figure 8 The three-dimensional structure diagram of an embodiment of the needle unit 40 of an infusion pump provided by the present application is shown. Figure 6 ; Figure 7 for Figure 9 A cross-sectional perspective diagram of Figure 9 The three-dimensional structure diagram of an embodiment of the needle unit 40 of an infusion pump provided by the present application is shown. Figure 8 .

[0068] In some embodiments, the needle unit 40 also includes a pressing portion 43 and a pin base 44 respectively arranged on both sides of the liquid circuit converter 41 along the second direction, and the liquid circuit converter 41 is fixedly connected to the pressing portion 43 and slidably cooperates with the pin base 44; wherein, the pin base 44 includes a rebound chamber 440 and a first elastic member 441 embedded in the rebound chamber 440, and the liquid circuit converter 41 is connected to the first elastic member 441 on the side toward the injection part 42 along the second direction.

[0069] In the embodiment of this application, Figure 6 As shown, the pressing portion 43 is configured as a button connected to the fluid path converter 41, wherein the lower cavity 12 is provided with a through hole corresponding to the needle 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.

[0070] For example, in combination Figure 9 and Figure 7As shown, the liquid path converter 41 is provided with a sealing plug to isolate the conversion liquid path 410 and the pressing part 43, while the pressing part 43 is provided with a through hole, so that when the needle unit 40 is in the injection state, the internal and external air pressure balance can be maintained. The shell of the liquid path converter 41 is in sliding fit with the needle base 44, and is provided with a first elastic member 441 connected with the liquid path converter 41, so that after the liquid path converter 41 is pressed by the pressing part 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 part 42 is arranged, that is, the injection part 42 is located in the rebound chamber 440, the pressing part 43 can drive the injection part 42 to move from the first position (as shown in Figure 9 the rebound chamber 440) to the second position (as shown in Figure 10 to Figure 12 the rebound chamber 440), and the first elastic member 441 can drive the injection part 42 to rebound from the second position to the first position.

[0071] As shown in Figure 10 , the needle base 44 is circumferentially provided with a plurality of protrusions (not shown in the figure), which can limit the first elastic member 441 in the retracted state so that the injection part 42 is in the second position. When the needle base 44 is deformed, 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, which can penetrate the lower cavity 12 to achieve the effects of pressing and extending and automatic rebounding.

[0072] As shown in Figure 11 , the liquid path converter 41 is further provided with a sealing groove 413 in communication 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 in communication 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.

[0073] In the embodiments of the present application, the sealing groove 413 serves as the movable area of the first sealing ring 4111 when the sealing valve core 411 is opened and closed, so that the first sealing ring 4111 can conduct or isolate the conversion liquid path 410 and the injection part 42 at any time, and prevent leakage of the drug solution during infusion. The use of the first sealing ring 4111 can ensure that the upper and lower ends of the conversion liquid path 410 are simultaneously sealed, thereby avoiding the entry of external dust into the conversion liquid path 410. Exemplarily, the sealing valve core 411 is further sleeved with a second sealing ring 4112 to form a double-sealing state with the first sealing ring 4111.

[0074] As shown in Figure 10 , Figure 12 To Figure 11In some embodiments, in combination with Figure 13 As shown, the base of the needle inserter is further provided with an inclined guide rail 442, and the sealing valve core 411 is provided with a valve head 4110 corresponding to the inclined guide rail 442; when the pressing portion 43 drives the fluid path converter 41 to fit with the inclined guide rail 442 along the second direction, the inclined guide rail 442 can press the valve head 4110 (as shown in FIG. Figure 14 As shown in FIG, the inclined surface of the inclined guide rail 442 is interlocked 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 connected to the injection part 42, thereby achieving smooth infusion of the drug solution into the body.

[0075] In some embodiments, the fluid path converter 41 is further provided with a side spring 412, which is located between the pressing portion 43 and the sealing valve core 411 along the second direction and abuts against the valve head 4110. In the embodiment of the present application, the side spring 412 abuts against the valve head 4110 to ensure that the sealing valve core 411 isolates the conversion fluid path 410 from the injection portion 42 (e.g., Figure 13 As shown), the sealing valve core 411 is in a normally closed state. When the inclined 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 spring sheet 412 and applies a resistance force to the side spring sheet 412, causing the side spring sheet 412 to deform (as shown). Figure 12 As shown); when the inclined guide rail 442 moves away from the sealing valve core 411, the deformed side spring piece 412 can apply force toward the sealing valve core 411 to isolate the conversion fluid path 410 and the injection portion 42.

[0076] Exemplarily, the side spring piece 412 is inserted into the fluid path converter 41 and has a "U" shape. However, this application does not limit the shape of the side spring piece 412; for example, it can also be configured as an "L" shape. Specifically, the width of the bent portion of the side spring piece 412 is the length by which the sealing valve core 411 protrudes from the injection fluid path 420 when the sealing valve core 411 is in the closed state.

[0077] See also Figure 3 As shown, Figure 14 A schematic diagram of the three-dimensional structure of an embodiment of a drug storage unit 20 of an infusion pump provided by the present application is shown; Figure 15 for Figure 16 Schematic cross-sectional view of ; Figure 15 for Figure 1 A partial enlarged view of Figure 16 A cross-sectional view of an embodiment of a drug storage unit 2020 of an infusion pump provided by the present application is shown; Figure 15 to Figure 16 for Figure 17 A partial enlarged schematic diagram of part A.

[0078] In some embodiments, the medicine bag isolation part 21 is also provided with a liquid outlet nozzle 211 in communication with the liquid inlet channel 210, and the liquid outlet nozzle 211 is in communication with the conversion liquid path 410 through a liquid infusion catheter (not shown in the figure); wherein the medicine bag isolation part 21 is also embedded with a medicine bag rubber plug 212 to seal the liquid inlet channel 210 and prevent dust from entering from the outside.

[0079] Exemplarily, when the external medicine bottle 50 is connected with the medicine bag isolation part 21, the needle body penetrates the medicine bag rubber plug 212 and the medicine bottle rubber plug 51 respectively. In some application scenarios, in combination with the fact that the medicine bag isolation part 21 is provided with the liquid inlet channel 210, the medicine bag rubber plug 212 is provided with the needle body, and the medicine bottle rubber plug 51 is provided with the needle body, the medicine bag isolation part 21 can be used as a medicine infusion pump. Figure 17 As shown in the figure, the upper end of the liquid inlet channel 210 is provided with a notch to facilitate the input of the medicine liquid. Wherein the liquid outlet nozzle 211 is located at one end of the liquid inlet channel 210, and 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 medicine storage bottle to stretch, the medicine liquid can be directly input to the medicine storage bag 22 along the external medicine bottle 50.

[0080] In some embodiments, the medicine storage bag 22 also includes a squeeze plug 220 penetrating the bottom of the medicine storage bag 22 in the first direction, as shown in the figure. Figure 1 As shown in the figure, the driving rod 31 can be sleeved on the outer circle side of the squeeze plug 220; wherein the side of the medicine bag isolation part 21 towards the medicine storage bag 22 is provided with a concave surface 213, and the squeeze plug 220 has a convex surface 221 capable of cooperating with the concave surface 213.

[0081] In the embodiments of the present application, if the medicine bag isolation part 21 and the squeeze plug 220 are arranged in a traditional plane contact, there will also be a folding distance of the side wall of the medicine storage bag 22 between the compressed medicine storage bag 22 and the medicine bag isolation part 21, that is, a "dead space" (residual space in which the medicine cannot be completely released or utilized) can be formed. In combination with the fact that Figure 17 As shown in the figure, through the design of the geometrically matched concave surface 213 and convex surface 221, when the medicine storage bag 22 is in a compressed state, the squeeze plug 220 can be moved up to the limit position, and the convex surface 221 is completely matched with the concave surface 213 of the medicine bag isolation part 21, so as to reduce the "dead space" that can be formed and forcibly discharge the residual medicine liquid.

[0082] In some application scenarios, when the infusion pump is used for injecting insulin, the design of the squeeze plug 220 and the medicine bag isolation part 21 can reduce the residual amount of insulin after each infusion, thereby improving the infusion accuracy of insulin and avoiding the blood sugar fluctuation of the user caused by the error of the insulin infusion dose.

[0083] In combination with the fact that Figure 1 and Figure 19 As shown in the figure, Figure 18 An embodiment of the internal structure of the infusion pump provided by the present application is shown in the figure. Figure 2 ; Figure 19 A partial enlarged view of an embodiment of the infusion pump provided by the present application is shown in the figure.

[0084] 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.

[0085] 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, as shown in FIG. Figure 3 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, causing the pin base 44 to deform, thereby releasing the first elastic member 441 in a compressed state, and then automatically rebounding the injection portion 42.

[0086] For example, in combination Figure 18 As shown, Figure 19 The following is a schematic diagram of the three-dimensional structure of an embodiment of the driving rod 31 of an infusion pump provided by the present application. The first toggle rod 310 and the second toggle rod 311 are both provided with inclined surfaces, so that when the first top plate 443 can expand outward along the inclined surface of the first toggle rod 310, the second top plate 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 no longer first, thereby achieving automatic rebound.

[0087] 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. 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 20 to Figure 22 and Figure 20 As shown, the movable handle 35 can be threadedly engaged with the drive rod 31, so that the user can pull the movable handle 35 to achieve the liquid aspiration action of the drug storage bag 22. In some application scenarios, after the liquid aspiration of the drug 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 then the motor assembly 39 or lever 36 of the subsequent drive unit 30 drives the drive rod 31 to accurately compress the drug storage bag 22 to achieve the infusion action.

[0088] Combine Figure 4 、 18 and Figure 21 As shown, Figure 5 The internal structure of an infusion pump according to the present invention is shown. Figure 22 ; Figure 6 The internal structure of an infusion pump according to the present invention is shown. Figure 20In some embodiments, the driving unit 30 further comprises a guide column 32, an extension block 33 and a second elastic member 34, the guide column 32 extends through the driving rod 31 and the extension block 33 in the first direction, and the second elastic member 34 is sleeved on the guide column 32.

[0089] In the embodiments, the guide column 32 extends through the driving rod 31 in the first direction 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.

[0090] In some embodiments, the driving unit 30 further comprises a screw rod 38 and a motor assembly 39 arranged in parallel with the guide column 32, the screw rod 38 is provided with a gear 380 engaged with an output shaft of the motor assembly 39; and the screw rod 38 extends through the extension block 33 in the first direction and is screw-connected with the extension block 33.

[0091] In the embodiments, the motor assembly 39 drives the screw rod 38 to rotate, which drives the extension block 33 to move upward to push the driving rod 31, and then drives the driving rod 31 to compress the medicine bag 22. For example, as shown in Figure 21 The gear 380 of the output shaft of the motor assembly 39 is engaged with the gear 380 of the screw rod 38, so that when the motor assembly 39 is working, the screw rod 38 can rotate synchronously with the gear 380. The bottom of the screw rod 38 is provided with a U-shaped ring to rotatably fix the screw rod 38 to the bottom of the lower cavity 12, and the screw rod 38 is screw-connected with the extension block 33, so that when the screw rod 38 rotates clockwise or counterclockwise, the extension block 33 can be driven to move upward to drive the driving rod 31 to move upward.

[0092] In some application scenarios, the motor assembly 39 comprises a motor bracket 391 fixed to the lower cavity 12 and a motor 390, and the motor 390 can accurately control the moving speed and distance of the driving rod 31, so as to accurately control the infusion amount and speed of the medicine liquid.

[0093] For example, as shown in Figure 22 The lower cavity 12 is further provided with a PCB board 120 connected with the motor assembly 39, and the PCB board 120 can be provided with a sensing module and a communication module, so as to drive signals and interact with external devices (such as a communication mobile phone), for example, a user can control the start of the motor 390 through a special APP and the like.

[0094] Referring to Figure 22 , the internal structure of an embodiment of the infusion pump provided by the present application is shown Figure 20 . Figure 21 ; ​Fig. 1 shows a schematic diagram of the internal structure of an embodiment of the infusion pump provided in the present application ​ ; ​ Fig. 1 shows a schematic diagram of the internal structure of an embodiment of the infusion pump provided in the present application ​ . In the figure, ​ and ​ the medicine storage bag 22 is in a compressed state, ​ the medicine storage bag 22 is in a stretched state.

[0095] In some embodiments, the driving unit 30 is further provided with a lever 36 rotatably arranged on the inner wall of the lower cavity 12 and a third elastic member 37 sleeved on the lever 36 and connected with the inner wall of the lower cavity 12; wherein the pressing part 43 of the needle unit is provided with a third top sheet 430, one end of the lever 36 is capable of abutting against the third top sheet 430, and the other end is capable of abutting against the extension block 33.

[0096] In the embodiments 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 shown in ​ ); when the pressing part 43 presses the injection part 42, the conversion liquid path 410 is in a conductive state with the injection part 42, the third top sheet 430 moves downward and abuts against one end (such as the shorter end) of the lever 36, in combination with ​ and ​ , the shorter end of the lever 36 is stressed, and the other end (such as the longer end) of the lever 36 is out of abutment with the extension block 33. The extension block 33 moves upward under the elastic force of the second elastic member 34, and the medicine storage bag 22 is compressed by the driving rod 31 under the elastic force of the second elastic member 34, so as to realize the infusion of the medicine liquid. Exemplarily, the third top sheet 430 is provided with a convex point for abutting against the lever 36. When the first and second driving rods 310 and 311 abut against the needle base 44, the deformation of the needle base 44 can realize the automatic return of the injection part 42 to complete the infusion and realize the quantitative infusion of the medicine liquid.

[0097] It is worth mentioning that the lever 36 and the third elastic member 37 constitute a spring driving system, and the second elastic member 34 serves as the main power source thereof; the motor assembly 39 and the screw rod 38 constitute a motor driving system, and the motor 390 serves as the main power source at this time, and the second elastic member 34 can assist the motor 390. In some application scenarios, the user can select the above two independent mechanical driving modes according to the actual needs, such as selecting the motor driving system when the requirement for the infusion speed and accuracy is higher.

[0098] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is carried out by using the content of the present application specification and drawings, should be within the protection scope of the present application.

Claims

1. An infusion pump characterized by, The application relates to a drug injection device. The device comprises a housing, a storage unit, a driving unit and a needle unit. The housing comprises an upper cover and a lower cavity which are buckled to each other, wherein one side of the upper cover is provided with a liquid inlet which penetrates the upper cover along a first direction. The storage unit comprises a medicine bag isolation part and a medicine bag, wherein the medicine bag isolation part is located at the liquid inlet and is provided with a liquid inlet channel, and the medicine bag is in communication with the liquid inlet channel. The driving unit is provided with a driving rod connected with the medicine bag and is configured to drive the driving rod to compress or stretch the medicine bag. The needle unit is in communication with the liquid inlet channel and is provided with a liquid path converter and an injection part which are connected with each other, the liquid path converter is provided with a conversion liquid path and a sealing valve core inserted in the conversion liquid path, and the sealing valve core is configured to open or isolate the conversion liquid path and the injection part. The needle unit further comprises a pressing part and a needle base which are respectively arranged on two sides of the liquid path converter along a second direction, the liquid path converter is fixedly connected with the pressing part and is in sliding fit with the needle base. The needle base is further provided with an inclined guide rail, and the sealing valve core is provided with a valve head corresponding to the inclined guide rail.

2. The infusion pump of claim 1, wherein, When the pressing part drives the liquid path converter to be attached to the inclined guide rail along the second direction, the inclined guide rail can press the valve head, so that the conversion liquid path and the injection part are in communication.

3. The infusion pump of claim 1, wherein, The medicine bag further comprises a pressing plug which penetrates the bottom of the medicine bag along the first direction, the pressing plug is connected with the driving rod, the medicine bag isolation part is provided with a concave surface on the side facing the medicine bag, and the pressing plug has a convex surface which can be matched with the concave surface.

4. The infusion pump of claim 1, wherein, The needle base comprises 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 is connected with the first elastic member along the second direction.

5. The infusion pump of claim 1, wherein, The liquid path converter is further provided with a side elastic sheet which is located between the pressing part and the sealing valve core along the second direction and is in abutment with the valve head.

6. The infusion pump according to any one of claims 1 to 5, characterized in that The liquid path converter is further provided with a sealing groove in communication with the conversion liquid path and the injection part, and the injection part is provided with an injection liquid path in communication with the conversion liquid path. The driving rod further comprises a first and a second dialing rod which are arranged at two sides of the needle unit, and the needle base is provided with a first and a second top sheet which can be in abutment with the first and the second dialing rod respectively. The driving unit further comprises a guide column, an extension block and a second elastic member, the guide column penetrates the driving rod and the extension block along the first direction, and the second elastic member is sleeved on the guide column.

7. The infusion pump of claim 6, wherein, The driving unit is further 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 with the inner wall of the lower cavity; wherein the pressing part 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.

8. The infusion pump of claim 6, wherein, The driving unit further comprises a screw rod and a motor assembly arranged in parallel with the guide column, the screw rod is provided with a gear meshing with an output shaft of the motor assembly; wherein the screw rod penetrates through the extension block along the first direction and is screwedly matched with the extension block.

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