Portable subcutaneous micro-injection pump device

Abstract

The utility model discloses a portable subcutaneous micro-injection pump device which comprises a shell, a containing cavity is formed in the middle of the shell, a motor fixing base is arranged in the containing cavity, a motor is arranged in the motor fixing base, and the end, close to the side of a cover plate, of the containing cavity is fixedly connected with a double-channel sleeve for an infusion tube to penetrate through. A cutting mechanism is fixedly connected to the surface, close to the port side of the double-channel sleeve, of the containing cavity, an injection pipe is arranged in the shell on the outer side of the cutting mechanism, a worm is connected to the driving end of the motor, a linkage gear is connected to the surface, outside one side of the worm, of the shell through a rotating shaft, and one gear ring of the linkage gear is meshed with the worm. According to the injection pump device, a cut infusion tube is pushed away from the cutting mechanism in the mode that the motor drives the screw to drive the single linkage gear, the internal structure of the injection pump device can be simplified, the size of the injection pump device is smaller, and the injection pump device is convenient to use. The patient is convenient to carry.

Description

TECHNICAL FIELD

[0001] The utility model relates to the injection pump technical field among medical apparatus and instruments, concretely is a portable subcutaneous micro -injection pump device. BACKGROUND

[0002] Subcutaneous injection refers to injecting liquid medicine into subcutaneous tissue, along with the continuous progress of medical technology, for the convenience of subcutaneous injection to patients, people design the micro -injection pump that uses the cooperation of the waistband, thereby facilitating the subcutaneous injection operation to patients.

[0003] The existing micro -injection pump is convenient for transmission of the infusion tube conveying liquid medicine, will help the blade to cut the opening on the infusion tube surface, so that the infusion tube can pass through the cutting position and not affect the normal infusion of the syringe and the transmission of the infusion tube, the micro -injection pump of this structure generally utilizes two or more than two linkage gears to clamp the cut infusion tube, and then cooperates with the motor to drive the transmission gear to push the cut infusion tube away from the cutting position, although it can achieve the purpose of pushing the cut infusion tube, but the configuration of two or more than two transmission gears will occupy more space inside the micro -injection pump, cause the micro -injection pump to be larger, it is inconvenient for the patient to carry, and the drive of two or more than two linkage gears for the infusion tube retraction operation needs the motor with larger power, since the micro -injection pump is disposable, the power storage of the power supply device equipped inside is limited, and the transmission structure with high power output will limit the endurance of the micro -injection pump.

[0004] Therefore, it is necessary to improve the structure of the subcutaneous micro -injection pump device. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of injection pump device, which is driven by motor to drive single linkage gear in the form of screw rod to push cut infusion tube away from cutting mechanism, which can simplify the internal structure of injection pump device, make the volume of injection pump device smaller, and more convenient for patients to carry when using.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a portable subcutaneous micro-injection pump device, comprising a housing, a placement cavity in the middle of the housing, a motor mounting base inside the placement cavity, a motor inside the motor mounting base with its opening covered by a cover plate, a double-channel sleeve for inserting an infusion tube fixedly connected to the end of the placement cavity near the cover plate, a cutting mechanism for cutting the infusion tube fixedly connected to the surface of the placement cavity near the sleeve port, an injection tube for docking with the cutting mechanism inside the housing outside the cutting mechanism, a worm gear connected to the drive end of the motor, a linkage gear with two or more gear rings connected to the housing surface outside the worm gear via a rotating shaft, one of the gear rings meshing with the worm gear, a cover plate extending outward from the motor mounting base and penetrated by the linkage gear, a perimeter of the cover plate through which the linkage gear penetrates forming a semi-enclosed edge for at least one gear ring of the linkage gear, and a tube withdrawal channel for the infusion tube to pass through between the perimeter and the gear ring.

[0007] Furthermore, the cutting mechanism includes a blade, a connecting end, and a piston. The blade is fixedly connected to the surface of the placement cavity near the dual-channel sleeve port, with the cutting edge facing the dual-channel sleeve port. The connecting end is integrally formed at the end of the blade near the center of the dual-channel sleeve port. One axial end of the piston is fixedly connected to the end of the connecting end facing the dual-channel sleeve port. Both the piston and the connecting end are hollow structures and are connected to each other. The piston penetrates into the infusion tube, and the other axial end communicates with the inside of the infusion tube. The injection tube penetrates into the connecting end and is connected to the connecting end.

[0008] Furthermore, the head of the infusion tube is fixedly connected to an elastic element. The other end of the elastic element is inserted into one of the channels of the dual-channel sleeve and led out to the outside of the dual-channel sleeve from the other channel on the same side, and is fixed by a fixing post set on the surface of the shell.

[0009] Furthermore, the other end of the elastic element is fixedly connected to the outer wall of the fixed column and can be wound around the outer wall of the fixed column.

[0010] Furthermore, a mainspring is sleeved on the rotating shaft below the linkage gear. The surface of the rotating shaft is provided with grooves distributed along the axial direction of the rotating shaft. A first hook is provided at the center end of the mainspring. A second hook is provided at the end of the winding portion of the mainspring edge. A positioning post is provided on the surface of the placement cavity on the outer side of the mainspring. The second hook is hooked on the outside of the positioning post.

[0011] Further, the surface of the shell outside the placement cavity is provided with a fixing plate, the middle part of the fixing plate is provided with a positioning opening for the insertion of the double-channel sleeve, the space outside the placement cavity and in the same straight line with the positioning opening is a placement space for the double-channel sleeve, the surface of the shell far away from the fixing plate is provided with a connecting seat, the end of the connecting seat is connected with a pressing plate through a rotating shaft, the end surface of the protruding part between the protruding part and the placement cavity is provided with a positioning channel for the swinging of the pressing plate.

[0012] Further, the thickness of the end of the pressing plate swinging into the positioning channel is less than or equal to the depth of the positioning channel, and the end surface of the protruding part is connected with a limiting plate swinging to the side of the positioning channel through a rotating shaft.

[0013] Further, the placement cavity outside the motor fixing seat is fixed with a PCB board for controlling the start and stop of the motor.

[0014] Further, the part of the linkage gear meshing with the worm is any one of a worm wheel or a helical gear.

[0015] The beneficial effects of the utility model are that the injection pump device drives a single linkage gear through a motor to push the cut infusion tube away from the cutting mechanism, which can simplify the internal structure of the injection pump device, make the volume of the injection pump device smaller, make the injection pump device more convenient to carry for patients in use, and simplify the structure of the infusion tube after cutting, thereby improving the endurance of the injection pump device and prolonging the service life of the injection pump device. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the injection pump device.

[0017] Figure 2 It is a structural schematic view of the cutting mechanism.

[0018] Figure 3 It is a structural schematic view of the infusion tube when passing through the cutting mechanism.

[0019] Figure 4 It is a structural schematic view of the worm and the linkage gear.

[0020] Figure 5 It is a structural schematic view of the linkage gear driving the infusion tube to move in the tube withdrawal channel.

[0021] Figure 6 It is a structural schematic view of the spring arranged in the placement cavity.

[0022] Figure 7 It is a structural schematic view of the spring.

[0023] Figure 8Structure diagram of the limiting plate towards the positioning channel side.

[0024] In the figure, 1, housing; 2, placement cavity; 3, motor fixing base; 4, motor; 5, cover plate; 6, double-channel sleeve; 7, cutting mechanism; 8, injection pipe; 9, worm; 10, linkage gear; 11, surrounding edge; 12, pipe withdrawal channel; 13, blade; 14, connecting end; 15, piston; 16, elastic member; 17, fixing column; 18, fixing plate; 19, positioning port; 20, connecting seat; 21, pressing plate; 22, protruding part; 23, positioning channel; 24, limiting plate; 25, PCB; 26, infusion tube; 27, gear ring; 28, spring; 29, groove; 30, first hooking part; 31, second hooking part; 32, positioning column. DETAILED DESCRIPTION

[0025] The utility model discloses a portable subcutaneous microinjection pump device, such as Figures 1-5 In combination with the shown, the injection pump device includes a housing 1, the middle part of the housing 1 is provided with a placement cavity 2, the placement cavity 2 is provided with a motor fixing base 3, the motor fixing base 3 is provided with a motor 4 and the opening is covered by a cover plate 5, the end of the placement cavity 2 close to the cover plate 5 side is fixedly connected with a double-channel sleeve 6 for the infusion tube 26 to pass through, the surface of the placement cavity 2 close to the sleeve port side is fixedly connected with a cutting mechanism 7 for cutting the infusion tube 26, the housing 1 outside the cutting mechanism 7 is provided with an injection pipe 8 for docking the cutting mechanism 7, the driving end of the motor 4 is connected with a worm 9, the surface of the housing 1 outside one side of the worm 9 is connected with a linkage gear 10 with two or more gear rings 27 through a rotating shaft, one of the gear rings 27 of the linkage gear 10 is engaged with the worm 9, the cover plate 5 extends outwardly to the motor fixing base 3 and is penetrated by the linkage gear 10, the surface of the cover plate 5 penetrated by the linkage gear 10 is provided with a surrounding edge 11 for forming a half-enclosure for at least one of the gear rings 27 of the linkage gear 10, the surrounding edge 11 and the gear ring 27 form a pipe withdrawal channel 12 for the infusion tube 26 to pass through.

[0026] Wherein, the motor 4 drives the worm 9 to rotate, the worm 9 rotates and drives the linkage gear 10 to rotate through the meshing effect of one of the gear rings 27 on the linkage gear 10, when the linkage gear 10 rotates, the cut-off mechanism 7 cuts the head section of the infusion tube 26 into the pipe return channel 12, with the continuous rotation of the linkage gear 10, the teeth on the gear ring 27 on the non-meshing side of the worm 9 on the linkage gear 10 will be inserted into the infusion tube 26, the infusion tube 26 in the pipe return channel 12 is extruded to the side of the surrounding edge 11 and is pushed to move in the pipe return channel 12, the infusion tube 26 is gradually transmitted to the cut-off mechanism 7 side under the continuous driving of the linkage gear 10, and the cut-off mechanism 7 cut-off infusion tube 26 will be gradually pushed into the pipe return channel 12, thereby pushing the cut-off infusion tube 26 away from the cut-off mechanism 7 side, forming an orderly infusion tube 26 conveying and material returning structure.

[0027] The double-channel sleeve 6 in the injection pump device is used to transport the infusion tube 26 with the liquid medicine, the infusion tube 26 after the liquid medicine flows out is cut by the cutting mechanism 7 and is pushed into the pipe return channel 12 under the driving of the linkage gear 10 to send away from the cutting mechanism 7, while maintaining the continuous conveying of the infusion tube 26, also does not affect the normal infusion of the injection tube 8, the cut-off infusion tube 26 is pushed away from the cutting mechanism 7 by the form of the motor 4 driving the screw to drive a single linkage gear 10, which can simplify the internal structure of the injection pump device, make the volume of the injection pump device smaller, more convenient for patients to carry when using, and the structure of the cut-off infusion tube 26 for pipe return is simplified, which can improve the endurance of the injection pump device, prolong the service life of the injection pump device.

[0028] As one of the preferred embodiments of the utility model, Figure 2 And Figure 3 As shown, the cutting mechanism 7 includes a blade 13, a connecting end 14 and a piston 15, the blade 13 is fixedly connected to the surface of the placement cavity 2 close to the port side of the double-channel sleeve 6 and the cutting edge faces the port of the double-channel sleeve 6, the connecting end 14 is integrally formed at the end of the blade 13 close to the center side of the port of the double-channel sleeve 6, one of the axial ends of the piston 15 is fixedly connected to the end of the connecting end 14 facing the port of the double-channel sleeve 6, the piston 15 and the connecting end 14 are both hollow structures and communicate with each other, the piston 15 penetrates into the infusion tube 26 and the other axial end communicates with the inside of the infusion tube 26, and the injection tube 8 penetrates into the connecting end 14 and communicates with the connecting end 14.

[0029] Wherein, under the driving of the linkage gear 10, the infusion tube 26 is continuously transmitted to the cutting structure side, the piston 15 extends into the port of the infusion tube 26 and props open the infusion tube 26, the liquid medicine in the infusion tube 26 enters into the piston 15, flows to the connecting end head 14 through the piston 15, and finally flows into the injection tube 8 through the connecting end head 14 for the patient to use when subcutaneously injected; the liquid medicine in the infusion tube 26 flows out and is transmitted to the side of the blade 13, the cutting edge of the blade 13 cuts into the port of the infusion tube 26, a crack is cut on the body of the infusion tube 26, so that the infusion tube 26 cannot pass through the connecting end head 14 when passing through the side of the connecting end head 14 due to the limitation of the injection tube 8, and the infusion tube 26 is pushed away from the connecting end head 14 and enters into the tube withdrawal channel 12 under the driving of the linkage gear 10 after passing through the side of the connecting end head 14, so that the purpose of supplementing the liquid medicine for the injection tube 8 without affecting the transmission of the infusion tube 26 is realized.

[0030] As one of the preferred embodiments of the utility model, as shown in Figure 1 The head of the infusion tube 26 is fixedly connected with an elastic member 16, the other end of the elastic member 16 is introduced from one channel port of the double-channel sleeve 6 and led out to the outside of the double-channel sleeve 6 from the other channel port of the same side, and is fixed through the fixing column 17 arranged on the surface of the shell 1.

[0031] Wherein, under the elastic recovery of the elastic member 16, the head of the infusion tube 26 is pulled after entering into the tube withdrawal channel 12, so that the head of the infusion tube 26 is pulled to move to the end of the tube withdrawal channel 12, the infusion tube 26 is more easily removed from the tube withdrawal channel 12, the function of sharing the work of the linkage gear 10 driving the infusion tube 26 to move out of the tube withdrawal channel 12 is played, the energy consumption required for the motor 4 driving the linkage gear 10 to drive the infusion tube 26 to move out of the tube withdrawal channel 12 is reduced, and the endurance time of the motor 4 driving is prolonged.

[0032] As a further preferred embodiment of the above-mentioned embodiment, as shown in Figure 1 The other end of the elastic member 16 is fixedly connected to the outer wall of the fixing column 17 and can be wound on the outer wall of the fixing column 17.

[0033] Wherein, the length of the elastic member 16 can be prolonged from the part wound on the side of the fixing column 17, so that the length of the elastic member 16 is adjusted according to the pulling requirement of the infusion tube 26.

[0034] As a further preferred embodiment of the above-mentioned embodiment, as shown in Figure 6 And Figure 7As shown, the rotating shaft outside the linkage gear 10 is sleeved with a clockwork 28, the surface of the rotating shaft is provided with grooves 29 distributed along the axial direction of the rotating shaft, the central end of the clockwork 28 is provided with a first hooking part 30, the winding end of the edge of the clockwork 28 is provided with a second hooking part 31, the surface of the placing cavity 2 outside the clockwork 28 is provided with a positioning column 32, and the second hooking part 31 is hooked outside the positioning column 32.

[0035] When the motor 4 drives the linkage gear 10, the rotating shaft rotates with the linkage gear 10, the central part of the clockwork 28 is connected to the rotating shaft, and the rotating direction of the rotating shaft is the same as the unwinding direction of the clockwork 28, so that the power generated by the unwinding of the clockwork 28 acts on the rotating shaft and is transmitted to the linkage gear 10, and the power is combined with the output power of the motor to drive the linkage gear 10 to push the infusion tube 26 out of the tube withdrawing channel 12, compared with the tube withdrawing operation of the infusion tube 26 driven by the motor 4 alone, the actual power of the motor 4 during operation is reduced, the power consumption of the motor 4 is reduced, the endurance of the injection pump device is prolonged, and the power generated by the unwinding of the clockwork 28 is not counteracted to the output power of the motor 4 when acting on the rotating shaft, but is unwound with the action of the motor 4 driving the linkage gear 10 by the worm 9, so that the power generated by the unwinding of the clockwork 28 is combined with the output power of the motor 4 to make the linkage gear 10 generate greater thrust to push the infusion tube 26, so that the cut infusion tube 26 is pushed away from the cutting mechanism 7 and sent into the tube withdrawing channel 12 faster; in addition, if the injection pump device needs to be reused, the motor 4 drives the worm 9 to rotate reversely, so as to drive the linkage gear 10 to rotate reversely, and then drive the clockwork 28 to be rewound, and the rewound clockwork 28 can be used as a power source to assist the linkage gear 10 to push the infusion tube 26 when the injection pump device is reused.

[0036] As one of the preferred embodiments of the utility model, as shown in the figure, Figure 1 The surface of the shell 1 outside one side of the placing cavity 2 is provided with a fixed plate 18, the middle part of the fixed plate 18 is provided with a positioning opening 19 for the double-channel sleeve 6 to pass through, the space outside the placing cavity 2 and on the same straight line with the positioning opening 19 is a storage space for placing the double-channel sleeve 6, the surface of the shell 1 away from the fixed plate 18 is provided with a connecting seat 20, the end of the connecting seat 20 is connected with a pressing plate 21 through a rotating shaft, the end surface of the shell 1 outside the other side of the placing cavity 2 is provided with a protruding part 22, and the protruding part 22 and the placing cavity 2 are provided with a positioning channel 23 for the pressing plate 21 to swing in.

[0037] The double-channel sleeve 6 is inserted into the positioning opening 19, so that the position of the double-channel sleeve 6 is fixed, and the pressing plate 21 is rotated and inserted into the positioning channel 23, so that the double-channel sleeve 6 is pressed by the pressing plate 21, and the position of the double-channel sleeve 6 in the storage space is further fixed, and the position is stable, and the double-channel sleeve 6 is more conducive to conveying the infusion tube 26.

[0038] As a further preferred embodiment of the above-mentioned embodiment, as shown in Figure 8 The end of the pressing plate 21 inserted into the positioning channel 23 has a thickness less than or equal to the depth of the positioning channel 23, and the end face of the protruding portion 22 is connected with a limiting plate 24 that can be swung to the side of the positioning channel 23 through a rotating shaft.

[0039] The limiting plate 24 is swung to the side of the positioning channel 23, so that the end of the pressing plate 21 in the positioning channel 23 is limited, and the situation that the infusion tube 26 is loosened from the storage space due to the accidental overturning of the pressing plate 21 from the positioning channel 23 is avoided.

[0040] As one of the preferred embodiments of the utility model, as shown in Figure 1 The placing cavity 2 outside the motor fixing seat 3 is fixed with a PCB 25 for controlling the start and stop of the motor 4.

[0041] The PCB 25 is connected with a control device (not shown in the figure) in the outside world, so that the PCB 25 can control the operation of the motor 4 after receiving the instruction of controlling the start and stop of the motor 4, and the purpose of controlling the operation of the injection pump device is achieved.

[0042] As a further preferred embodiment of the above-mentioned embodiment, as shown in Figure 4 And Figure 6 As shown in combination, the part of the linkage gear 10 engaged with the worm 9 is any one of a worm wheel or a helical gear.

[0043] As described in the above content, a part of the linkage gear 10 is engaged with the worm 9, and the worm can generate the engagement mode of the transmission pair except the worm wheel. According to the technical information disclosed in “Calculation of Time-varying Engagement Stiffness and Nonlinear Dynamic Characteristics of Worm Helical Gear Transmission Pair” (Liu Fei, Feng Jie, Chen Yonghong, Mechanical Design, May 2024, Vol. 41, No. 5), in fact, the helical gear can also constitute a transmission pair with the worm, and the commonality of the worm wheel and the helical gear is that both belong to the gear category. Therefore, the structure type of the part of the linkage gear 10 referred to as “gear” is actually a helical gear and a worm wheel. The engagement mode of the helical gear and the worm actually needs to comply with the principle of modulus adaptation, but under the preferred condition, the transmission effect of the worm and the worm wheel is the best.

[0044] Further explanation of the above: in the production and application environment involved in the utility model, plastic is generally selected as the material source of the linkage gear 10, it is recorded in "Research on the Change Law of Meshing Force of Plastic Helical Gear and Steel Worm" (Yun Yongxi, Hu Hong, Ta Jingning, "Mechanical Transmission", No. 11, 2018, 27-32) that plastic helical gear is prone to wear and fatigue failure in some positions when matched with a worm, and thus the preferred condition is a worm, but since the utility model structure is relatively simple, if designed as a one-time or short-term use product, the application effect of the helical gear will not differ too much compared with the worm of the same material, and thus the linkage gears 10 of the two specifications can both serve as the optional gear types of the utility model.

[0045] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A portable subcutaneous microinfusion pump device, the infusion pump device comprising a housing, characterized in that, The middle part of the shell is provided with a placing cavity, the placing cavity is provided with a motor fixing seat, the motor fixing seat is provided with a motor, the opening of the motor fixing seat is covered by a cover plate, the end of the placing cavity close to the cover plate is fixedly connected with a double-channel sleeve for the infusion tube to pass through, the surface of the placing cavity close to the sleeve port is fixedly connected with a cutting mechanism for cutting the infusion tube, the shell outside the cutting mechanism is provided with a syringe for connecting the cutting mechanism, the driving end of the motor is connected with a worm, the surface of the shell outside one side of the worm is connected with a linkage gear with two or more than two gear rings through a rotating shaft, one of the gear rings of the linkage gear is engaged with the worm, the cover plate extends outwardly from the motor fixing seat and is penetrated by the linkage gear, the surface of the cover plate penetrated by the linkage gear is provided with a surrounding edge for forming a half-enclosure for at least one of the gear rings of the linkage gear, the surrounding edge and the gear ring form a tube returning channel for the infusion tube to pass through.

2. A portable subcutaneous microinfusion pump device according to claim 1, wherein, The cutting mechanism comprises a blade, a connecting end and a piston, the blade is fixedly connected to the surface of the placing cavity close to the double-channel sleeve port, and the blade edge faces the double-channel sleeve port, the connecting end is integrally formed at the end of the blade close to the center side of the double-channel sleeve port, one of the axial ends of the piston is fixedly connected to the end of the connecting end facing the double-channel sleeve port, the piston and the connecting end are hollow structures and communicate with each other, the piston penetrates into the infusion tube and the other axial end communicates with the inside of the infusion tube, and the syringe penetrates into the connecting end and communicates with the connecting end.

3. The portable subcutaneous microinfusion pump set of claim 1, wherein, The head of the infusion tube is fixedly connected with an elastic member, the other end of the elastic member penetrates into one of the channel ports of the double-channel sleeve and then leads out to the outside of the double-channel sleeve from the other channel port on the same side, and is fixed by the fixing column arranged on the surface of the shell.

4. A portable subcutaneous microinfusion pump device according to claim 3, wherein, The other end of the elastic member is fixedly connected to the outer wall of the fixing column and can be wound on the outer wall of the fixing column.

5. The portable subcutaneous microinfusion pump set of claim 1, wherein, A clockwork is sleeved on the rotating shaft below the linkage gear, the surface of the rotating shaft is provided with grooves distributed along the axial direction of the rotating shaft, the central end of the clockwork is provided with a first hooking part, the end of the winding part of the edge of the clockwork is provided with a second hooking part, the surface of the placing cavity outside the clockwork is provided with a positioning column, and the second hooking part is hooked on the outer wall of the positioning column.

6. The portable subcutaneous microinfusion pump set of claim 1, wherein, The surface of the shell outside one side of the placing cavity is provided with a fixing plate, the middle part of the fixing plate is provided with a positioning port for the double-channel sleeve to pass through, the space outside the placing cavity and on the same straight line with the positioning port is a storage space for placing the double-channel sleeve, the surface of the shell away from the fixing plate is provided with a connecting seat, the end of the connecting seat is connected with a pressing plate through a rotating shaft, the end surface of the pressing plate is provided with a limiting plate which can be swung to the side of the positioning channel.

7. A portable subcutaneous microinfusion pump set according to claim 6, wherein, The thickness of the end of the pressing plate in the positioning channel is less than or equal to the depth of the positioning channel, and the end surface of the protruding part is connected with a limiting plate which can be swung to the side of the positioning channel through a rotating shaft.

8. The portable subcutaneous microinfusion pump of claim 1, wherein, The placing cavity outside the motor fixing seat is fixedly provided with a PCB board for controlling the start and stop of the motor.

9. The portable subcutaneous microinfusion pump assembly of claim 1, wherein, The part of the linkage gear engaged with the worm is a worm wheel.

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