A precise micro-flow dose control device for medical injection pump

Abstract

The application discloses a precision micro-flow drug delivery control device suitable for a medical injection pump and belongs to the technical field of medical instruments, which comprises a base and a drug delivery mechanism capable of realizing precision micro-flow drug delivery and assembled on the base.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a precision micro-flow drug delivery control device suitable for medical infusion pumps. Background Technology

[0002] A medical infusion pump is a medical device used to achieve precise and continuous intravenous drug delivery. In the existing technology, a common infusion pump usually includes a base, a drive motor, a transmission mechanism (such as a lead screw and nut or a gear and rack) that converts the rotational motion of the motor into linear motion, and a fixed seat for holding a single syringe (needle). Its working principle is to precisely control the pushing speed and distance of the plunger on the syringe piston by controlling the speed and angle of the motor, thereby achieving the output of the set flow rate of drug solution. This type of single-channel infusion pump has a relatively simple structure.

[0003] Most existing infusion pumps use a single-channel design. When the medication in the syringe is used up, the administration process must be paused. Medical staff must manually disassemble the empty syringe, install a new syringe, and restart the device. This operation not only interrupts the treatment process and may affect the efficacy of the drug (especially in treatment scenarios where the continuity of administration is strictly required), but also increases the cumbersomeness of clinical operations and the risk of contamination. Summary of the Invention

[0004] The purpose of this invention is to address the problem that most existing infusion pumps adopt a single-channel design, and to propose a precision micro-flow drug delivery control device suitable for medical infusion pumps.

[0005] To achieve the above objectives, the present invention employs the following technology: a precision micro-flow drug delivery control device suitable for medical infusion pumps, comprising a base on which a drug delivery mechanism capable of achieving precision micro-flow drug delivery is mounted; The drug delivery mechanism includes a support frame fixedly mounted on a base, a rotating rod and a rotating frame mounted on the support frame, and needle tubes respectively mounted on both sides of the rotating frame. The needle tubes are fixed in place and will not be loose on the rotating frame. The installed needle tubes can be used to deliver drugs through a pushing component mounted on the base. The base is also equipped with a driving component that can switch between the two needle tubes and drive the pushing component to operate.

[0006] As a further description of the above technical solution: the fixing component includes slots opened on both sides of the rotating frame, the threaded rod is threadedly installed on the rotating frame, the pressure plate and the threaded rod are rotatably connected, and the push plate is set on the rotating frame through the crossbeam.

[0007] As a further description of the above technical solution: the threaded rod and the push plate are respectively provided with grooves, the syringe barrel and the piston rod of the needle tube are located in the corresponding grooves, and the pressure plate and the rotating frame are slidably connected.

[0008] As a further description of the above technical solution: the pushing component includes a fixed plate fixedly installed on the base, a turntable set on the fixed plate via a connecting rod, a push rod set on the fixed plate via a guide frame, a protrusion fixedly installed on one side of the turntable, and a through groove opened at the end of the push rod.

[0009] As a further description of the above technical solution: the connecting rod and the fixed plate are rotatably connected, the push rod and the guide frame are slidably connected, and one end of the push rod is in contact with one of the push plates, with the protrusion located in the through groove.

[0010] As a further description of the above technical solution: the drive assembly includes a mounting bracket fixedly mounted on the base, a motor, a housing and a protective frame fixedly mounted on the mounting bracket, the output end of the motor extending into the interior of the housing and fixedly connected to a face gear, and rotating shafts slidably connected to both sides of the housing, with a bevel gear fixedly mounted on each rotating shaft.

[0011] As a further description of the above technical solution: the slide is fixedly connected to the output end of the electric telescopic rod, and the slide is slidably connected to the outer shell and the mounting bracket, with one end of each of the two rotating shafts rotatably connected to the slide.

[0012] As a further description of the above technical solution: the mounting bracket is also equipped with a transmission component; The transmission component includes a transmission rod rotatably mounted on the protective frame, a main bevel gear fixedly mounted on the transmission rod, a connecting frame fixedly mounted between the support frame and the protective frame, and a secondary bevel gear mounted on the connecting frame and the protective frame via a round rod. The round rod and the rotating rod are respectively meshed by pulleys connected coaxially with a synchronous belt.

[0013] As a further description of the above technical solution: one end of each of the two rotating shafts extends to the outside of the mounting bracket, and the connecting rod and the transmission rod are slidably connected to the corresponding rotating shafts through cross sliders.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: By setting up double-sided needles and a rotating frame that can rotate 180 degrees, the system can automatically and quickly switch to another spare needle when the current needle is about to run out of medication, without interrupting the drug delivery process. This ensures the continuity of treatment (such as continuous drug infusion) and avoids the adverse effects that may occur when drug delivery is interrupted when changing needles with traditional infusion pumps. At the same time, the needles are installed through adjustable fixing components, and the replacement operation is performed in the non-working position (waiting position), without affecting the normal operation of the needle at the drug delivery position. The pusher component converts rotational motion into smooth linear propulsion. Combined with the scale lines on the syringe, real-time monitoring by the position sensor, and feedback from the PLC controller, it can achieve precise control of the piston rod position, thereby meeting the requirements for low-flow-rate and high-precision drug delivery. The drive assembly uses a single motor to drive a face gear, which, in conjunction with an axially sliding carriage and two bevel gears, enables the reuse of power for both "switching syringes" and "push-to-drug administration". Power can be transferred to the transmission component or the push-to-drug component simply by moving the carriage left or right with an electric telescopic rod. This design reduces the number of power sources, simplifies the structure, and effectively reduces the manufacturing cost of the device. Attached Figure Description

[0015] Figure 1 An overall schematic diagram provided according to an embodiment of the present invention is shown; Figure 2 The present invention provides an embodiment of the invention. Figure 1 Another perspective view; Figure 3 An internal structural diagram of the housing and protective frame provided according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of a fixing component provided according to an embodiment of the present invention is shown; Figure 5 The diagram shows the effect of the needle being removed according to an embodiment of the present invention; Figure 6 A schematic diagram of a driving component provided according to an embodiment of the present invention is shown; Figure 7 A diagram showing the positional relationship between a face gear and a bevel gear according to an embodiment of the present invention is provided. Figure 8 The present invention provides an embodiment of the invention. Figure 7 Enlarged view of region A in the middle; Figure 9 A schematic diagram of a transmission component provided according to an embodiment of the present invention is shown.

[0016] Legend: 10. Base; 20. Drug delivery mechanism; 21. Support frame; 22. Rotating rod; 23. Rotating frame; 24. Needle tube; 25. Fixing component; 251. Slot; 252. Threaded rod; 253. Pressure plate; 254. Push plate; 255. Crossbar; 26. Pushing component; 261. Fixing plate; 262. Turntable; 263. Connecting rod; 264. Push rod; 265. Guide frame; 266. Protrusion; 267. Through slot; 27. Drive assembly; 271. Mounting bracket; 272. Motor; 273. Face gear; 274. Shaft; 275. Bevel gear; 276. Carriage; 277. Electric telescopic rod; 278. Transmission components; 2781. Transmission rod; 2782. Main bevel gear; 2783. Connecting bracket; 2784. Secondary bevel gear; 2785. Round rod; 2786. Synchronous belt. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figures 1 to 9 This embodiment provides a precision micro-flow drug delivery control device suitable for medical infusion pumps, including a base 10, on which a drug delivery mechanism 20 capable of achieving precision micro-flow drug delivery is mounted; The drug delivery mechanism 20 includes a support frame 21 fixedly mounted on a base 10. A rotating rod 22 and a rotating frame 23 are mounted on the support frame 21. The rotating rod 22 and the rotating frame 23 are rotatably connected to the support frame 21. One end of the rotating rod 22 extends to the outside of the support frame 21 and is fixedly connected to the rotating frame 23. Therefore, the rotating rod 22 can drive the rotating frame 23 to rotate. A needle tube 24 is provided on both sides of the rotating frame 23. The needle tube 24 will not be loose on the rotating frame 23 by the fixing component 25. The two needle tubes 24 can be switched by rotating the rotating frame 23 by 180 degrees. The installed needle tube 24 can be drug delivered by the pushing component 26 mounted on the base 10. The base 10 is also equipped with a driving component 27 that can switch the two needle tubes 24 and drive the pushing component 26 to operate. Initially, the syringe 24 at the top is in the medication administration state, while the syringe 24 at the bottom on the other side of the rotating frame 23 is in the waiting state. When the medication in the top syringe 24 is about to run out, the alarm light on the base 10 will flash to indicate this. At this time, medical staff can press the button on the base 10, which will cause the drive component 27 to drive the rotating rod 22 to rotate through the PLC controller, thereby causing the rotating frame 23 to rotate 180 degrees. This quickly switches the syringe 24 from the waiting state to the medication administration position, avoiding the problem of interrupting the medication administration process when changing the syringe 24 in traditional devices, which would lead to discontinuous medication administration and affect the treatment effect. After the syringe 24 is switched, the syringe 24 that was originally at the top and whose medication has run out is moved to the lower waiting position. Medical staff can directly replace the syringe 24 in this position through the fixing component 25. The replacement process will not interfere with the current medication administration process, effectively improving the convenience of using the device.

[0019] Reference Figures 4 to 5 Specifically, in order to install or replace the syringe 24, a fixing component 25 is provided. The fixing component 25 includes slots 251 on both sides of the rotating frame 23, a threaded rod 252 threadedly installed on the rotating frame 23, and a pressure plate 253 rotatably connected to the threaded rod 252. The rotating threaded rod 252 can drive the pressure plate 253 to rise and fall. The syringe 24 is placed in the slots 251. The push plate 254 is set on the rotating frame 23 through the crossbeam 255. A return spring is provided between the push plate 254 and the crossbeam 255, and the push plate 254 and the crossbeam 255 are slidably connected. The moving push plate 254 can push the piston rod of the syringe 24, thereby realizing drug delivery.

[0020] In more detail, grooves are respectively provided on the threaded rod 252 and the push plate 254. The syringe and piston rod of the needle tube 24 are located in the corresponding grooves. The corresponding grooves can limit the movement of the syringe and piston rod of the needle tube 24. Together with the pressing plate 253, they can achieve a stable and fixed effect. The needle tube 24 is provided with scale lines. A position sensor (model BX5M-MFR-T series) is also provided on the base 10 to monitor the movement position of the piston rod for drug administration and provide real-time feedback to the PLC controller, thereby realizing precise micro-flow drug administration control. The pressing plate 253 and the rotating frame 23 are slidably connected, which can limit the movement of the pressing plate 253 so that the pressing plate 253 will not rotate with the threaded rod 252. When it is necessary to replace the syringe 24 with insufficient medication, simply rotate the threaded rod 252. The threaded rod 252 will rotate outward along the rotating frame 23, causing the pressure plate 253, which is rotatably connected to itself, to rise and leave the syringe area of ​​the syringe 24. At this time, the empty syringe 24 can be directly removed from the slot 251. Then, the new syringe 24 pre-filled with the target medication is aligned with the slot 251 and inserted, so that the syringe is placed in the groove on one side of the slot 251 and the piston rod is placed in the groove on the side of the push plate 254. Then, rotate the threaded rod 252 in the opposite direction. The threaded rod 252 drives the pressure plate 253 to press down, stably pressing the syringe in the slot 251, completing the fixed installation of the new syringe 24. The needle tip of the new syringe 24 can be protected with a kit to prevent contamination. The whole operation process is simple and quick. Moreover, because the replacement process is carried out in the waiting position, it will not affect the normal medication administration of the syringe 24 in the medication position, ensuring the continuity of the medication administration process.

[0021] Reference Figures 1 to 7 Specifically, in order to enable drug delivery via the needle 24, a push assembly 26 is provided. The push assembly 26 includes a fixed plate 261 fixedly mounted on the base 10, a turntable 262 mounted on the fixed plate 261 via a connecting rod 263, a push rod 264 mounted on the fixed plate 261 via a guide frame 265, a protrusion 266 fixedly mounted on one side of the turntable 262, and a through groove 267 opened at the end of the push rod 264. The through groove 267 is a vertical groove.

[0022] In more detail, the connecting rod 263 is rotatably connected to the fixed plate 261, the turntable 262 can rotate on the fixed plate 261 through the connecting rod 263, the push rod 264 is slidably connected to the guide frame 265, the push rod 264 can move on the guide frame 265, and one end of the push rod 264 is in contact with one of the push plates 254. The moving push rod 264 can push the corresponding push plate 254. The protrusion 266 is located in the through groove 267. When the turntable 262 rotates, it will also drive the protrusion 266 to rotate. The rotation of the protrusion 266 will generate a lateral force to push the through groove 267, so that the push rod 264 can move. During drug administration, the connecting rod 263 is driven to rotate by the drive assembly 27. The connecting rod 263 drives the turntable 262 to rotate synchronously. The protrusion 266 fixed on the turntable 262 will follow the turntable 262 to make a circular motion. During the rotation, the protrusion 266 will squeeze the side wall of the through groove 267, which will drive the push rod 264 to move horizontally along the guide frame 265 toward the needle tube 24. When the push rod 264 moves, it will abut against the corresponding push plate 254, pushing the push plate 254 to move along the cross frame 255 toward the needle tube 24. When the push plate 254 moves, it will squeeze the piston rod of the needle tube 24, pushing the liquid medicine in the needle tube 24 out at a uniform speed to achieve continuous drug administration. When the protrusion 266 rotates to the side away from the push plate 254, the push plate 254 will push the push rod 264 back to its original position under the action of the return spring on the crossbar 255, waiting for the next advance stroke. Through this structure, the motor 272 controls the rotation speed of the turntable 262 and, together with the position sensor, monitors the position of the piston rod of the needle tube 24 in real time, which can realize micro-flow drug delivery control and meet the needs of low flow rate and high precision drug delivery in special scenarios.

[0023] Reference Figures 6 to 9 Specifically, in order to achieve the switching of needle 24 and the operation of drug delivery status, a drive assembly 27 is set up. The drive assembly 27 includes a mounting bracket 271 fixedly installed on the base 10, a motor 272, a housing and a protective frame fixedly installed on the mounting bracket 271. The output end of the motor 272 extends into the interior of the housing and is fixedly connected to the face gear 273. The output end of the motor 272 can drive the face gear 273 to rotate. Rotating shafts 274 are slidably connected to both sides of the housing. Each rotating shaft 274 is fixedly installed with a bevel gear 275. The rotating shaft 274 on the right side and the bevel gear 275 correspond to the connecting rod 263. The rotating shaft 274 on the left side and the bevel gear 275 correspond to the transmission rod 2781. The teeth of the bevel gear 275 are adapted to the tooth pitch of the face gear 273.

[0024] In more detail, one end of each of the two rotating shafts 274 extends to the outside of the mounting bracket 271. The connecting rod 263 and the transmission rod 2781 are slidably connected to the corresponding rotating shafts 274 via cross sliders. The cross sliders enable the left and right rotating shafts 274 to drive the corresponding connecting rods 263 and transmission rods 2781 to rotate respectively, and the cross sliders ensure the sliding between the left and right rotating shafts 274 and the connecting rods 263 and transmission rods 2781.

[0025] In more detail, the slide 276 is fixedly connected to the output end of the electric telescopic rod 277. The slide 276 can be moved by the output end of the electric telescopic rod 277. The slide 276 is slidably connected to the outer shell and the mounting bracket 271. One end of the two rotating shafts 274 is rotatably connected to the slide 276. The moving slide 276 can drive the two rotating shafts 274 to move, thereby switching the meshing state of the left and right bevel gears 275 and the face gears 273. In the initial state, the bevel gear 275 on the right is engaged with the face gear 273. The face gear 273 can be driven to rotate through the output end of the motor 272. When the face gear 273 rotates, the bevel gear 275 on the right will be driven to rotate. In turn, the connecting rod 263 will be driven to rotate through the corresponding cross slider via the right rotating shaft 274, thus completing the power input of the pushing component 26 and ensuring the stable operation of the drug delivery process. At this time, the bevel gear 275 on the left is in a disengaged state from the face gear 273 and will not drive the transmission rod 2781 to rotate, thus avoiding accidental rotation during the switching process. When the needle tube 24 needs to be replaced to complete the position switch, the PLC controller will first control the electric telescopic rod 277 to start. The output end of the electric telescopic rod 277 drives the slide 276 to move to the left. When the slide 276 moves, it will simultaneously drive the two rotating shafts 274 to move to the left. The right bevel gear 275, which was originally meshed with the face gear 273, will move away from the face gear 273 as the rotating shaft 274 moves to the left, disengaging and stopping the transmission. The left bevel gear 275, which was originally disengaged, will move to the meshing position of the face gear 273 as the left rotating shaft 274 moves to the left. Once engagement is complete, the rotation of the face gear 273 drives the left bevel gear 275 to rotate, which in turn drives the left rotating shaft 274 to rotate. The left rotating shaft 274 then transmits power to the rotating frame 23 via the transmission component 278. The entire engagement switching process can be completed simply by the electric telescopic rod 277 pushing the slide 276 to move. The operation response is fast and the power transmission is stable. Only one motor 272 is needed to provide power for the two actions of pushing the drug delivery and switching the needle tube 24, which effectively reduces the overall manufacturing cost of the device and reduces unnecessary power component redundancy. Meanwhile, a sloping guide structure is set at the teeth of the bevel gear 275 to ensure that the bevel gear 275 can mesh with the face gear 273, and the outer shell plays a protective role for the face gear 273 and the bevel gear 275.

[0026] In more detail, the mounting bracket 271 is also equipped with a transmission component 278; The transmission component 278 includes a transmission rod 2781 rotatably mounted on a protective frame, a main bevel gear 2782 fixedly mounted on the transmission rod 2781, the main bevel gear 2782 being able to rotate via the transmission rod 2781, a connecting frame 2783 fixedly mounted between the support frame 21 and the protective frame, and a secondary bevel gear 2784 disposed on the connecting frame 2783 and the protective frame via a round rod 2785, the round rod 2785 being rotatably connected to the connecting frame 2783 and the protective frame, the protective frame providing protection for the main bevel gear 2782 and the secondary bevel gear 2784, the round rod 2785 and the rotating rod 22 being respectively meshed with a synchronous belt 2786 via a pulley connected coaxially, the synchronous belt 2786 and the rotating rod 22 being able to rotate synchronously via the meshing transmission of the synchronous belt 2786, the connecting frame 2783 providing protection for the synchronous belt 2786; When the left-side rotating shaft 274 rotates, it drives the transmission rod 2781 to rotate through the corresponding cross slider. When the transmission rod 2781 rotates, it drives the main bevel gear 2782 fixed on it to rotate synchronously. The main bevel gear 2782 drives the secondary bevel gear 2784 meshing with it to rotate. When the secondary bevel gear 2784 rotates, it drives the round rod 2785 to rotate between the connecting frame 2783 and the protective frame. The pulley at one end of the round rod 2785 is driven by the synchronous belt 2786, which drives the pulley at the other end of the rotating rod 22 to rotate synchronously, thereby driving the rotating rod 22 to rotate 180 degrees as a whole, completing the precise switching of the positions of the two needle tubes 24. The transmission ratio of the entire transmission process is stable, which can accurately control the rotation angle of the rotating frame 23 and avoid the position switching deviation from affecting subsequent drug administration. After the needle 24 position is switched, the PLC controller controls the output end of the electric telescopic rod 277 to drive the slide 276 to move to the right, so that the right bevel gear 275 re-engages with the face gear 273 and the left bevel gear 275 disengages, so that the device returns to the working state of pushing drug delivery and continues to deliver stable micro-flow drug delivery.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A precision micro-flow drug delivery control device suitable for medical infusion pumps, characterized in that, Includes a base (10), on which a drug delivery mechanism (20) capable of delivering precise, minute-volume drugs is mounted. The drug delivery mechanism (20) includes a support frame (21) fixedly installed on a base (10), a rotating rod (22) and a rotating frame (23) set on the support frame (21), and needle tubes (24) are respectively set on both sides of the rotating frame (23). The needle tubes (24) are fixed on the rotating frame (23) by the fixing component (25) and will not be loose. The installed needle tubes (24) can be drug delivered by the push component (26) assembled on the base (10). The base (10) is also equipped with a drive component (27) that can switch the two needle tubes (24) and drive the push component (26) to operate.

2. The precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 1, characterized in that, The fixing component (25) includes slots (251) on both sides of the rotating frame (23), a threaded rod (252) is threadedly installed on the rotating frame (23), the pressure plate (253) is rotatably connected to the threaded rod (252), and the push plate (254) is set on the rotating frame (23) through the crossbar (255).

3. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 2, characterized in that, The threaded rod (252) and the push plate (254) are respectively provided with grooves, the syringe and piston rod of the needle tube (24) are located in the corresponding grooves, and the pressure plate (253) and the rotating frame (23) are slidably connected.

4. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 2, characterized in that, The pushing component (26) includes a fixed plate (261) fixedly installed on the base (10), a turntable (262) set on the fixed plate (261) via a connecting rod (263), a push rod (264) set on the fixed plate (261) via a guide frame (265), a protrusion (266) fixedly installed on one side of the turntable (262), and a through groove (267) opened at the end of the push rod (264).

5. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 4, characterized in that, The connecting rod (263) is rotatably connected to the fixed plate (261), the push rod (264) is slidably connected to the guide frame (265), and one end of the push rod (264) is in contact with one of the push plates (254), and the protrusion (266) is located in the through groove (267).

6. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 4, characterized in that, The drive assembly (27) includes a mounting bracket (271) fixedly mounted on the base (10), a motor (272), a housing and a protective frame fixedly mounted on the mounting bracket (271), the output end of the motor (272) extends into the interior of the housing and is fixedly connected to the face gear (273), and rotating shafts (274) are slidably connected to both sides of the housing, and bevel gears (275) are fixedly mounted on each rotating shaft (274).

7. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 6, characterized in that, The slide (276) is fixedly connected to the output end of the electric telescopic rod (277), and the slide (276) is slidably connected to the outer shell and the mounting bracket (271). One end of the two rotating shafts (274) is rotatably connected to the slide (276).

8. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 6, characterized in that, The mounting bracket (271) is also equipped with a transmission component (278). The transmission component (278) includes a transmission rod (2781) rotatably mounted on the protective frame, a main bevel gear (2782) fixedly mounted on the transmission rod (2781), a connecting frame (2783) fixedly mounted between the support frame (21) and the protective frame, and a secondary bevel gear (2784) set on the connecting frame (2783) and the protective frame through a round rod (2785). The round rod (2785) and the rotating rod (22) are respectively meshed by a synchronous belt (2786) through a pulley connected coaxially.

9. A precision micro-flow drug delivery control device suitable for medical infusion pumps according to claim 8, characterized in that, One end of each of the two rotating shafts (274) extends to the outside of the mounting bracket (271), and the connecting rod (263) and the transmission rod (2781) are slidably connected to the corresponding rotating shafts (274) via cross sliders.

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