Infusion pumpTechnical Field
The invention relates to the technical field of medical appliances, in particular to an infusion pump.
Background
Infusion pumps are infusion devices that are used to ensure that a drug, liquid or nutritional agent is safely delivered into a patient at a precise dosage, and with which infusion of a drug (e.g., insulin) into the body at a specific rate and dosage over a desired period of time can be accomplished. However, the present infusion pump generally adopts the principle of a piston push rod, so that the axial volume of the infusion pump is larger, and if the liquid medicine with the length A needs to be pushed, the piston push rod needs to correspondingly extend out of the cartridge by at least the distance of the length A, so that the dimension of the pump body (comprising the cartridge and the piston push rod) is at least the length of the axial direction (the movement direction of the piston push rod) 2A.
Based on this, european patent application publication (EP 3675932B 1) discloses a micro patch pump for insulin delivery and its auxiliary device, which is configured with a Reusable Part (RP) for inserting a drug delivery patch pump, and a Disposable Part (DP) for aligning the RP with the drug delivery patch. Wherein the dosator plunger may be configured to be moved back and forth by the RP drive unit. The injection process is such that insulin can be delivered to the dispenser through the reservoir, the dispenser catheter, when the dispenser plunger is moved rearward. When the applicator plunger is displaced forward, insulin may be delivered from the applicator through the outlet conduit, expelled from the applicator, and the port hole, cannula opening and cannula inserted into the user.
As can be seen in connection with the drawings of the european patent document, the device requires the provision of a plurality of one-way valves (e.g. a first one-way valve, a second one-way valve, a third one-way valve, a one-way valve, etc.) to achieve single pass delivery of insulin. And as can be seen from the drawings of fig. 9, the device is provided with a fixed medicine storage device occupying a large transverse and vertical space and a vertically-pushing cannula and other parts communicated with the medicine storage device on the basis that a fluid channel is established with an external insulin vial. In other words, as shown in fig. 3 of the european patent document, the pump body is thicker, still occupies a larger space, so that the pump body has a risk of unstable attachment in the actual use process, and the medicine flowing through the channel and the cannula part for infusing the human body and the like have a larger room for improvement.
Disclosure of Invention
The invention provides an infusion pump which aims to solve the problem of large volume of a pump body in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is to provide the infusion pump which comprises a shell, a medicine storage unit, a driving unit and a contact pin unit. The shell comprises an upper cover body and a lower cavity body which are buckled with each other, wherein one side of the upper cover body is provided with a liquid inlet which penetrates through the upper cover body 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 positioned 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 needle inserting unit is communicated with the liquid inlet channel and is provided with a liquid path converter and an injection part which are mutually connected, a conversion liquid path and a sealing valve core inserted in the conversion liquid path are arranged in the liquid path converter, and the sealing valve core is configured to be capable of conducting or isolating the conversion liquid path and the injection part.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that:
By arranging the driving rod to drive the medicine storage bag to execute the shrinkage action, the medicine storage bag can be shrunk to realize the inhalation of medicine liquid into the medicine storage bag when the medicine bag isolation part is connected with an 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 upwards, the medicine storage bag is compressed, and when the driving rod moves downwards, the medicine storage bag is stretched. Compared with a conventional pump body structure, the driving rod and the medicine storage bag are matched, so that conventional piston components can be removed, and the arrangement of axial space is saved.
The sealing valve core is configured to conduct or isolate the switching liquid path from the injection part, so that the liquid medicine is ensured to flow unidirectionally during infusion. When the infusion is needed to be executed, the sealing valve core conducts the conversion liquid path and the injection part, the driving rod moves up to the medicine storage bag to be in a contracted state, and the medicine liquid in the medicine storage bag flows to the injection part and is infused into the body. Compared with the pump body which is conventionally arranged at present, the infusion pump also removes the traditional infusion pipeline, so that the axial space and the transverse space occupation can be greatly saved, the pump body is lighter in use, and the infusion of the medicine at accurate dosage and speed is ensured.
In some embodiments, the medicine storage bag further comprises a squeezing plug penetrating through the bottom of the medicine storage bag along the first direction, the squeezing plug is connected with the driving rod, a concave surface is arranged on one side, facing the medicine storage bag, of the medicine storage bag isolation part, and the squeezing plug is provided with a convex surface capable of being matched with the concave surface.
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 storage bag isolation part, so that the dead space of the medicine storage bag (the residual space which cannot be completely released or utilized due to the design or operation limitation of the device) is reduced, the gap between the medicine storage bag isolation part and the medicine storage bag is smaller, the medicine liquid residue of the medicine storage bag after the infusion is reduced, and the infusion quantity precision of the medicine liquid is improved.
In some embodiments, the contact pin unit further comprises a pressing part and a contact pin base which are respectively arranged at 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 contact pin base, the contact pin base comprises a rebound chamber and a first elastic piece embedded in the rebound chamber, and the liquid path converter is connected with the first elastic piece along one side of the liquid path converter, which faces the injection part along the second direction.
By adopting the technical scheme, through the cooperation of the first elastic piece and the liquid path converter, the liquid path converter can realize automatic rebound under the elastic action of the first elastic piece after being pressed by the pressing part. Because the first elastic piece is located one side of the liquid path converter, where the injection part is arranged, that is, the injection part is correspondingly located in the rebound cavity, 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 piece can drive the injection part to rebound from the second position to the first position.
In some embodiments, the needle inserter base is further provided with a bevel guide rail, the sealing valve core is provided with a valve head corresponding to the bevel guide rail, and when the pressing part drives the liquid path converter to be attached to the bevel guide rail along the second direction, the bevel guide rail can push the valve head so that the conversion liquid path is communicated with the injection part, and therefore liquid medicine can be smoothly infused into a body.
Further, the liquid path converter is further provided with a side elastic piece, and the side elastic piece is located between the pressing part and the sealing valve core along the second direction and is abutted to the valve head.
By adopting the technical scheme, the side elastic sheet and the valve head can ensure that the sealing valve core isolates the switching liquid path from the injection part, namely the sealing valve core is in a normally closed state. When the inclined guide rail ejects the valve head of the sealing valve core, the other side of the valve head is propped against the side elastic sheet and applies resistance force to the side elastic sheet so as to deform the side elastic sheet, and when the inclined guide rail is far away from the sealing valve core, the deformed side elastic sheet can apply force to the sealing valve core so as to isolate the switching liquid path and the injection part.
In some embodiments, the liquid path converter is further provided with a sealing groove respectively communicated with the conversion liquid path and the injection part, the injection part is provided with an injection liquid path communicated with the conversion liquid path, wherein the sealing valve core is sleeved with a first sealing ring, the first sealing ring is positioned in the sealing groove, and the length of the sealing groove is larger than the inner diameter of the injection liquid path.
By adopting the technical scheme, the sealing groove is used as a 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 the liquid medicine is prevented from leaking in the infusion process. The first sealing ring can ensure that the upper end and the lower end of the conversion liquid path are sealed at the same time, so that external dust is prevented from entering the conversion liquid path.
In some embodiments, the medicine bag isolating part is also provided with a liquid outlet nozzle communicated with the liquid inlet channel, and the liquid outlet nozzle is communicated with the conversion liquid path through an infusion catheter, wherein the medicine bag isolating part is also embedded with a medicine bag rubber plug so as to seal the liquid inlet channel and prevent external dust from entering.
In some embodiments, the driving rod further comprises a first poking rod and a second poking rod which are arranged at two sides of the pin unit at intervals, wherein the pin base is provided with a first top sheet and a second top sheet which can be respectively abutted with the first poking rod and the second poking rod at intervals.
By adopting the technical scheme, the first poking rod and the second poking rod synchronously move when the driving rod moves, so that when the driving rod moves up to a certain height, the first poking rod and the second poking rod can press the first top sheet and the second top sheet, so that the contact pin base deforms, the first elastic piece in a compressed state can be released, and the injection part automatically rebounds, and the accurate control of infusion liquid medicine is effectively realized.
In some embodiments, the driving unit further comprises a guide post, an extension block and a second elastic member, wherein the guide post penetrates through the driving rod and the extension block along the first direction, and the second elastic member is sleeved on the guide post.
And/or, the driving unit further comprises a movable handle penetrating through the bottom surface of the lower cavity along the first direction, and the movable handle is connected with the driving rod and can drive the driving rod to displace along the first direction.
By adopting the technical scheme, the guide column extends along the first direction and penetrates through the driving rod so as to stably guide the driving rod. The second elastic piece is sleeved on the guide post, so that when the medicine bag is in a stretching state (namely, the second elastic piece is compressed), the second elastic piece can lift up the extension block and the driving rod, and the driving rod has a certain elastic reset function. The manual operation can be realized by additionally arranging the movable handle, namely, the movable handle is pushed to drive the driving rod to realize the compression or the stretching of the medicine storage bag, so that the medicine liquid is sucked.
In some embodiments, the driving unit is further provided with a lever and a third elastic piece, the lever is rotatably arranged on the inner wall of the lower cavity, the third elastic piece is sleeved on the lever and connected with the inner wall of the lower cavity, the pressing part of the pin inserting unit is provided with a third top sheet, one end of the lever can be abutted with the third top sheet, and the other end of the lever is abutted with the extension block.
By adopting the technical scheme, when the extension block moves upwards under the action of the elastic force of the second elastic piece, one end of the lever can be separated from the propped state of the extension block, and meanwhile, the third top piece at the other end of the lever is propped against, so that the switching liquid path is in a conducting state with the injection part, and the driving rod compresses the medicine storage bag under the action of the elastic force of the second elastic piece, so that the infusion of liquid medicine is realized. When the first poking rod and the second poking rod are abutted against the contact pin base, deformation of the contact pin base is caused, automatic rebound of the injection part can be achieved, infusion is completed, and the infusion quantity of liquid medicine is accurately controlled.
In some embodiments, the driving unit further comprises a screw rod and a motor assembly, wherein the screw rod and the motor assembly are arranged in parallel with the guide post, the screw rod is provided with a gear meshed with an output shaft of the motor assembly, and the screw rod penetrates through the extension block along the first direction and is in spiral fit with the extension block.
By adopting the technical scheme, the screw is driven to rotate through the motor assembly, the extension block is driven to move upwards to push the driving rod, and then the driving rod is driven to compress the medicine storage bag. Wherein, the motor drive can accurate control actuating lever's velocity of movement to realize accurate control liquid medicine's infusion volume and infusion speed. The lower cavity is also internally provided with a PCB (printed circuit board) to be connected with the motor assembly so as to realize the interaction of driving signals and external equipment (such as a communication mobile phone).
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it will be obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic cross-sectional perspective view of an embodiment of an infusion pump according to the present invention;
FIG. 2 is a schematic perspective view of an infusion pump according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view I of one embodiment of an infusion pump provided by the present invention;
FIG. 4 is a second cross-sectional view of an embodiment of an infusion pump provided by the present invention;
FIG. 5 is a schematic diagram showing a perspective view of an infusion pump according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of an embodiment of a needle unit of an infusion pump according to the present invention;
FIG. 7 is a schematic perspective view of the cross-section of FIG. 6;
FIG. 8 is a schematic diagram showing a perspective view of an embodiment of a pin unit of an infusion pump according to the present invention;
fig. 9 is a schematic perspective view of the section of fig. 8.
FIG. 10 is a schematic perspective view of an embodiment of a drug storage unit of an infusion pump according to the present invention;
FIG. 11 is a schematic cross-sectional view of FIG. 10;
FIG. 12 is an enlarged view of a portion of FIG. 11;
FIG. 13 is a cross-sectional view of one embodiment of a drug storage unit of an infusion pump provided by the present invention;
FIG. 14 is an enlarged partial schematic view of FIG. 13;
FIG. 15 is a schematic view of the internal structure of an embodiment of an infusion pump according to the present invention;
FIG. 16 is an enlarged partial schematic view of an embodiment of an infusion pump provided by the present invention;
FIG. 17 is a schematic perspective view of an embodiment of a drive rod of an infusion pump according to the present invention;
FIG. 18 is a schematic diagram showing the internal structure of an infusion pump according to an embodiment of the present invention;
FIG. 19 is a schematic view showing the internal structure of an embodiment of an infusion pump according to the present invention;
fig. 20 is a schematic diagram showing an internal structure of an infusion pump according to an embodiment of the present invention.
FIG. 21 is a schematic view showing the internal structure of an infusion pump according to an embodiment of the present invention;
fig. 22 is a schematic diagram showing an internal structure of an infusion pump according to an embodiment of the present invention.
In the figure:
10. The device comprises a shell, an upper cover body, 110, a liquid inlet, 12, a lower cavity, 120, a PCB (printed circuit board), 121, a transparent shell plate, 20, a medicine storage unit, 21, a medicine bag isolation part, 210, a liquid inlet channel, 211, a liquid outlet nozzle, 212, a medicine bag rubber plug, 213, a concave surface, 22, a medicine storage bag, 220, an extrusion plug, 221 and a convex surface;
30. A driving unit; 31, a driving rod, 310, a first toggle rod, 311, a second toggle rod, 32, a guide post, 33, an extension block, 34, a second elastic piece, 35, a movable handle, 36, a lever, 37, a third elastic piece, 38, a screw rod, 380, a gear, 39, a motor assembly, 390, a motor, 391 and a motor bracket;
40. The device comprises a contact pin unit, a 41-liquid path converter, a 410-liquid path conversion unit, 411, a sealing valve core, 4110, a valve head, 4111, a first sealing ring, 4112, a second sealing ring, 412, a side spring plate, 413, a sealing groove, 42, an injection part, 420, an injection liquid path, 43, a pressing part, 430, a third top plate, 44, a contact pin base, 440, a rebound chamber, 441, a first elastic piece, 442, a bevel guide rail, 443, a first top plate, 444, a second top plate, 50, an external medicine bottle, 51 and a rubber plug.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
For convenience of the following description, the present application defines a first direction (Z), a second direction (X) and a third direction (Y) with reference to fig. 2 before describing a specific structure of the infusion pump. The first direction is the height direction, such as the Z direction, of the infusion pump when the infusion pump is normally placed, the second direction is the length direction, such as the X direction, of the infusion pump when the infusion pump is normally placed, and the third direction is the width direction, such as the Y direction, of the infusion pump when the infusion pump is normally placed. In the present application, the first direction (X), the second direction (Z) and the third direction (Y) are perpendicular to each other.
It is understood that the perpendicularity of the present application is not absolute, and that approximate perpendicularity due to machining errors and assembly errors (e.g., an angle of 89.9 ° between two structural features) is also within the scope of the perpendicularity of the present application.
Referring to fig. 1 to 4, fig. 1 shows a schematic cross-sectional perspective view of an embodiment of an infusion pump according to the present application, fig. 2 shows a schematic cross-sectional view of an embodiment of an infusion pump according to the present application, fig. 3 shows a cross-sectional view of an embodiment of an infusion pump according to the present application, fig. 4 shows a cross-sectional view of an embodiment of an infusion pump according to the present application, wherein the drug storage bag 22 is in a compressed state in fig. 1, 2 and 4, and the drug storage bag 22 is in a stretched state in fig. 3.
In some embodiments, the infusion pump includes a housing 10, a drug storage unit 20, a drive unit 30, and a needle unit 40. The housing 10 includes an upper cover 11 and a lower cavity 12 that are fastened to each other, wherein a liquid inlet 110 penetrating through the upper cover 11 along a first direction is provided at one side of the upper cover 11. Referring to fig. 2, the upper cover 11 and the lower cavity 12 are fastened to each other to form a chamber for accommodating internal components (such as the drug storage unit 20 and the driving unit 30), and the liquid inlet 110 is concavely formed on one side of the upper cover 11 and can be used for connecting with an external medicine bottle 50, as shown in fig. 3, the external medicine bottle 50 can be a penicillin bottle.
The medicine storage unit 20 comprises a medicine bag isolating part 21 and a medicine storage bag 22, wherein the medicine bag isolating part 21 is positioned at the liquid inlet 110 and is provided with a liquid inlet channel 210, and the medicine storage bag 22 is communicated with the liquid inlet channel 210. Referring to fig. 3, 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. Illustratively, the drug storage bladder 22 is a compressible bladder made of a material having elasticity (e.g., rubber, silicone, etc.), the interior of which is hollow and can be used to store a drug solution.
The driving unit 30 is provided with a driving rod 31 connected to the medicine storage bag 22 and configured to be able to drive the driving rod 31 to compress or stretch the medicine storage bag 22, and when the driving rod 31 moves up (as shown in fig. 1), the medicine storage bag 22 is compressed, and when the driving rod 31 moves down (as shown in fig. 3), the medicine storage bag 22 is stretched. The drug solution in the drug vial is sucked into the drug storage bag 22 by switching the drug storage bag 22 from the compressed state to the stretched state by the driving rod 31. Compared with the structure of the traditional injection pump body, the matching mode of the driving rod 31 and the medicine storage bag 22 can remove the conventional push rod piston component, so that the space length in the first direction is saved.
The contact pin unit 40 is communicated 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, a conversion liquid path 410 and a sealing valve core 411 which is inserted in the conversion liquid path 410 are arranged in the liquid path converter 41, wherein the sealing valve core 411 is configured to be capable of conducting or isolating the conversion liquid path 410 and the injection part 42. As shown in connection with fig. 2, the lower chamber 12 is provided with a through hole so that the injection part 42 of the needle unit 40 can be brought into contact with the skin therethrough, wherein, as shown in a hatched portion of fig. 1, a sealing valve core 411 is provided in the needle unit 40 to isolate the injection part 42 when not infused, ensuring unidirectional flow of the medical fluid.
After the medicine storage bag 22 stores the medicine liquid, the medicine storage bag 22 is in a stretched state (as shown in fig. 3), at this time, the driving rod 31 is located at the lower part of the lower cavity 12, when the infusion needs to be performed, the sealing valve core 411 conducts the switching liquid path 410 and the injection part 42, the driving rod 31 moves up to the medicine storage bag 22 to be in a contracted state (as shown in fig. 4), and the infusion amount of the medicine liquid located inside the medicine storage bag 22 entering the injection part 42 is accurately controlled. In some application scenarios, the side of the lower cavity 12 in communication with the injection portion 42 can be covered with a double-sided tape, so that the housing 10 can adhere to the skin of the user.
The design removes the traditional infusion pipeline, can control the infusion metering of the liquid medicine with extremely high precision, such as being applied to the conventional injection of insulin liquid, the infusion pump is more convenient, has smaller thickness, is not easy to fall off when attached to the epidermis, and can accurately control the infusion metering of each time through the driving unit.
Referring to fig. 5 to 8, fig. 5 shows a schematic perspective view of an embodiment of an infusion pump according to the present application, fig. 6 shows a schematic perspective view of an embodiment of a pin unit 40 of an infusion pump according to the present application, fig. 7 is a schematic perspective view of a section of fig. 6, and fig. 8 shows a schematic perspective view of an embodiment of a pin unit 40 of an infusion pump according to the present application.
In some embodiments, the pin unit 40 further includes a pressing portion 43 and a pin base 44 respectively disposed on two sides of the liquid path converter 41 along the second direction, the liquid path converter 41 is fixedly connected with the pressing portion 43 and slidingly engaged 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 path converter 41 is connected to the first elastic member 441 along the second direction toward one side of the injection portion 42.
In the embodiment of the present application, as shown in fig. 5, the pressing portion 43 is provided as a button connected to the liquid path converter 41, wherein the lower chamber 12 is provided with a through hole corresponding to the pin unit 40 so that the pressing portion 43 can protrude from the lower chamber 12. The injection part 42 can be extended along the other side of the lower chamber 12 when the user presses the pressing part 43.
Illustratively, as shown in connection with fig. 6 and 7, the liquid path switch 41 is provided with a sealing plug to isolate the switching liquid path 410 and the pressing portion 43, while the pressing portion 43 is provided with a through-hole so that the internal and external air pressure balance can be maintained when the pin unit 40 is in the injection state. The housing of the liquid path converter 41 is slidably matched with the pin base 44, and a first elastic member 441 is connected with the liquid path converter 41, so that the liquid path converter 41 can automatically rebound under the action of the elastic force of the first elastic member 441 after being pressed by the pressing portion 43. Since the first elastic member 441 is located on the side of the liquid path converter 41 where the injection portion 42 is located, that is, the injection portion 42 is located in the rebound chamber 440, the pressing portion 43 can simultaneously drive the injection portion 42 to move from the first position (located in the rebound chamber 440 as shown in fig. 7) to the second position (extending out of the rebound chamber 440 as shown in fig. 8), and the first elastic member 441 can drive the injection portion 42 to rebound from the second position to the first position.
Wherein, as shown in fig. 6, the pin base 44 is provided with a plurality of protruding parts (not shown in the drawing) along the circumferential direction, and the protruding 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 is deformed, the elastic force of the first elastic member 441 can automatically retract the injection portion 42 to the first position. In some applications, the injection portion 42 includes a needle that can be replaced at any time, which may be able to penetrate the lower cavity 12, achieving a push extension and an automatic rebound effect.
In some embodiments, as shown in connection with fig. 7, the liquid path converter 41 is further provided with a sealing groove 413 respectively communicated with the conversion liquid path 410 and the injection part 42, the injection part 42 is provided with an injection liquid path 420 communicated 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 positioned in the sealing groove 413, and the length of the sealing groove 413 is larger than the inner diameter of the injection liquid path 420.
In the embodiment of the present application, the sealing groove 413 is used as the movable area of the first sealing ring 4111 when the sealing valve 411 is opened and closed, so that the first sealing ring 4111 can conduct or isolate the switching liquid path 410 and the injection part 42 at any time, and prevent the liquid medicine from leaking in the infusion process. The first sealing ring 4111 is used to ensure that the upper and lower ends of the conversion liquid path 410 are sealed at the same time, so as to prevent external dust from entering the conversion liquid path 410. Illustratively, the sealing spool 411 is further sleeved with a second sealing ring 4112 to form a double sealing state with the first sealing ring 4111.
Fig. 9 is a schematic perspective view of fig. 8, in combination with fig. 9. In some embodiments, as shown in fig. 6, the needle inserter base is further provided with a bevel guide rail 442, the sealing valve core 411 is provided with a valve head 4110 corresponding to the bevel guide rail 442, when the pressing portion 43 drives the liquid path converter 41 to be attached to the bevel guide rail 442 along the second direction, the bevel guide rail 442 can press the valve head 4110 (as shown in fig. 9), and the inclined surface of the bevel guide rail 442 is buckled with the inclined surface of the valve head 4110 so as to abut against the sealing valve core 411, so that the conversion liquid path 410 is conducted with the injection portion 42, and smooth infusion of the liquid medicine into the body is realized.
In some embodiments, the liquid path converter 41 is further provided with a side spring piece 412, and the side spring piece 412 is located between the pressing portion 43 and the sealing spool 411 in the second direction and abuts against the valve head 4110. In the embodiment of the present application, the abutment of the side spring 412 and the valve head 4110 can ensure that the sealing valve core 411 isolates the switching fluid path 410 from the injection portion 42 (as shown in fig. 7), so that the sealing valve core 411 is in a normally closed state. When the inclined guide rail 442 ejects the valve head 4110 of the sealing valve core 411, the other side of the valve head 4110 pushes against the side elastic piece 412 and applies a resistance force to the side elastic piece 412, so that the side elastic piece 412 is deformed (as shown in fig. 9), and when the inclined guide rail 442 is 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 switching fluid path 410 and the injection part 42.
Illustratively, the side spring 412 is inserted into the liquid path converter 41, and has a "U" shape. However, the shape of the side spring 412 is not limited, and may be, for example, an "L" shape. Specifically, the width of the bent portion of the side elastic piece 412 is the length of the sealing valve 411 protruding from the injection liquid path 420 when it is in the closed state.
Referring to fig. 10 to 12, fig. 10 is a schematic perspective view showing an embodiment of a drug storage unit 20 of an infusion pump according to the present application, fig. 11 is a schematic cross-sectional view of fig. 10, fig. 12 is a partially enlarged view of fig. 11, fig. 13 is a cross-sectional view showing an embodiment of a drug storage unit 2020 of an infusion pump according to the present application, and fig. 14 is a partially enlarged schematic cross-sectional view of a portion a of fig. 13.
In some embodiments, the medicine bag isolating part 21 is further provided with a liquid outlet nozzle 211 communicated with the liquid inlet channel 210, and the liquid outlet nozzle 211 is communicated with the conversion liquid path 410 through an infusion catheter (not shown in the figure), wherein the medicine bag isolating part 21 is further embedded with a medicine bag rubber plug 212 so as to seal the liquid inlet channel 210 and prevent external dust from entering.
Illustratively, when the external medicament vial 50 is connected to the capsule spacer 21, the needle penetrates the capsule plug 212 and the vial plug 51, respectively. In some application scenarios, as shown in connection with fig. 12, a notch is provided at the upper end of the liquid inlet channel 210 to facilitate liquid medicine input. The liquid outlet 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 and embedding 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 into the medicine storage bag 22 along the external medicine bottle 50.
In some embodiments, the medicine storage bag 22 further comprises a pressing plug 220 penetrating through the bottom of the medicine storage bag 22 along the first direction, as shown in fig. 3, the driving rod 31 can be sleeved on the outer ring side of the pressing plug 220, wherein the medicine storage bag 22 side of the medicine storage bag isolating part 21 is provided with a concave surface 213, and the pressing plug 220 is provided with a convex surface 221 capable of being matched with the concave surface 213.
In the embodiment of the present application, if the drug-bag separating portion 21 and the squeeze plug 220 are disposed in contact with each other in a conventional plane, the compressed drug-storage bag 22 and the drug-bag separating portion 21 are further separated by a folded distance of the sidewall of the drug-storage bag 22, and thus a "dead space" (a residual space where the drug cannot be completely released or utilized) is formed. As shown in fig. 14, the concave surface 213 and the convex surface 221 are geometrically matched, so that when the drug storage bag 22 is in a compressed state, the extrusion plug 220 can move up to a very limited position, and the convex surface 221 of the extrusion plug is completely attached to the concave surface 213 of the drug bag isolation part 21, so that possible dead space is reduced, and residual drug liquid is forcedly discharged.
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 insulin residual quantity after each infusion, thereby improving the infusion precision of insulin and avoiding the blood sugar fluctuation of a user caused by the infusion dosage error of insulin.
Referring to fig. 15 and 16, fig. 15 is a schematic view showing an internal structure of an embodiment of an infusion pump according to the present application, and fig. 16 is a schematic view showing a partial enlarged view of an embodiment of an infusion pump according to the present application.
In some embodiments, the driving rod 31 further comprises a first poking rod 310 and a second poking rod 311 which are arranged at two sides of the pin unit 40 at intervals, wherein the pin base 44 is provided with a first top piece 443 and a second top piece 444 which can respectively abut against the first poking rod 310 and the second poking rod 311 at intervals.
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. 15 to 16, the first toggle rod 310 and the second toggle rod 311 press against the first top piece 443 and the second top piece 444 of the pin base 44, so that the pin base 44 deforms, and the first elastic element 441 in a compressed state can be released, so as to automatically rebound the injection part 42.
Illustratively, in connection with fig. 17, fig. 17 is a schematic perspective view of an embodiment of a driving rod 31 of an infusion pump according to 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 piece 443 can expand along the inclined surface of the first toggle rod 310, the second top piece 444 can expand along the inclined surface of the second toggle rod 311, and then the pin base 44 is driven to deform, so that the first elastic piece 441 does not need to rebound automatically.
In some embodiments, the driving unit 30 further includes a movable handle 35 penetrating through the bottom surface of the lower cavity 12 along the first direction, where the movable handle 35 is connected to the driving rod 31 and can drive the driving rod 31 to displace along the first direction. Illustratively, as shown in connection with FIGS. 1 and 17, the movable handle 35 may be threadably engaged with the drive rod 31 such that a user may effect the pipetting action of the drug reservoir 22 by pulling on the movable handle 35. In some application scenarios, when the drug storage bag 22 is imbibed, the user can rotate the movable handle 35 to separate from the movable handle 35, so as to reduce the vertical length of the infusion pump, and the motor component 39 or the lever 36 of the subsequent driving unit 30 drives the driving rod 31 to precisely compress the drug storage bag 22 to realize the infusion action.
Referring to fig. 1, 18 and 19, fig. 18 shows a second internal structure of an embodiment of an infusion pump according to the present application, and fig. 19 shows a third internal structure of an embodiment of an infusion pump according to the present application. In some embodiments, the driving unit 30 further includes a guide post 32, an extension block 33, and a second elastic member 34, where the guide post 32 penetrates the driving rod 31 and the extension block 33 along the first direction, and the second elastic member 34 is sleeved on the guide post 32.
In the embodiment of the present application, the guide posts 32 extend along the first direction and penetrate the driving rod 31 to stably guide the driving rod 31. The second elastic member 34 is sleeved on the guide post 32, so that when the drug sac 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.
In some embodiments, the drive unit 30 further comprises a screw 38 and a motor assembly 39 arranged parallel to the guide post 32, the screw 38 being provided with a gear 380 engaging with an output shaft of the motor assembly 39, wherein the screw 38 extends through the extension block 33 in a first direction and is in screw engagement with the extension block 33.
In the embodiment of the present application, the motor assembly 39 drives the screw 38 to rotate, so as to drive the extension block 33 to move upwards to push the driving rod 31, and further drive the driving rod 31 to compress the medicine storage bag 22. Illustratively, as shown in connection with fig. 18, the gear 380 of the output shaft of the motor assembly 39 meshes with the gear 380 of the screw 38 such that the screw 38 is capable of synchronous rotation with the gear 380 during operation of the motor assembly 39. The bottom of the screw 38 is provided with a U-shaped ring, so that the screw 38 can be rotatably fixed at the bottom of the lower cavity 12, and the screw 38 is in threaded engagement with the extension block 33, so that the extension block 33 can be driven to move upwards when the screw 38 rotates clockwise or anticlockwise, and the driving rod 31 can be driven to move upwards.
In some application scenarios, the motor assembly 39 includes a motor bracket 391 and a motor 390 fixed in the lower cavity 12, and can precisely control the moving speed and the moving distance of the driving rod 31 in a manner of driving the motor 390, thereby realizing precise control of the infusion quantity and the infusion speed of the liquid medicine.
Illustratively, as shown in connection with fig. 19, a PCB board 120 is further disposed in the lower cavity 12 to be connected to the motor assembly 39, and a sensing module and a communication module may be disposed on the PCB board 120, so as to drive signals and interact with external devices (such as a communication handset), such as a user may control the start of the motor 390 through a dedicated APP or the like.
Referring to fig. 20 to 22, fig. 20 shows a fourth internal structure of an embodiment of an infusion pump according to the present application, fig. 21 shows a fifth internal structure of an embodiment of an infusion pump according to the present application, and fig. 22 shows a sixth internal structure of an embodiment of an infusion pump according to the present application. Wherein, the medicine storing bag 22 is in a compression state in fig. 20 and 21, and the medicine storing bag 22 is in a tension state in fig. 22.
In some embodiments, the driving unit 30 is further provided with a lever 36 and a third elastic member 37, the lever 36 is rotatably disposed on the inner wall of the lower cavity 12, the third elastic member 37 is sleeved on the lever 36 and connected with the inner wall of the lower cavity 12, wherein the pressing portion 43 of the pin unit is provided with a third top sheet 430, one end of the lever 36 can be abutted with the third top sheet 430, and the other end can be abutted with the extension block 33.
In the embodiment of the present application, when the pressing portion 43 does not press the injection portion 42, one end of the lever 36 abuts against the extension block 33 (as shown in fig. 22), and when the pressing portion 43 presses the injection portion 42, the switching liquid path 410 is in a conductive state with the injection portion 42, the third top sheet 430 moves downward and abuts against one end (e.g., a shorter end) of the lever 36, and as shown in fig. 20 and 21, the shorter end of the lever 36 is forced while the other end (e.g., a longer end) of the lever 36 is pulled out from the abutting state with the extension block 33. The extension block 33 moves upwards under the elastic action of the second elastic piece 34, and the drug storage bag 22 is compressed under the elastic action of the second elastic piece 34 through the driving rod 31, so that the infusion of the drug liquid is realized. Illustratively, the third topsheet 430 is provided with a bump for abutment with the lever 36. When the first toggle rod 310 and the second toggle rod 311 are abutted against the pin base 44, the deformation of the pin base 44 is caused, so that the injection part 42 can automatically rebound to complete infusion, and the quantitative infusion of liquid medicine can be realized.
It should be noted that the lever 36 and the third elastic member 37 form a spring driving system, and the second elastic member 34 is used as a main power source thereof, and the motor assembly 39 and the screw 38 form a motor driving system, and the motor 390 is used as a main power source, so that the second elastic member 34 can assist the motor driving system. In some application scenarios, a user may select the two independent mechanical driving modes according to actual requirements, for example, when the requirement on the infusion speed accuracy is higher, a motor driving system may be selected.
The foregoing description is only of embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields using the descriptions and drawings of the present invention should be carried within the scope of the present invention.