Infusion dripping speed control and liquid amount early warning device

Abstract

The invention provides an infusion dripping speed control and liquid amount early warning device which comprises a dripping speed direct control module, the dripping speed direct control module comprises a stepping motor, an eccentric cam, a microcontroller and an infusion hose clamping mechanism, the stepping motor is controlled in a rotating mode through the microcontroller, the microcontroller calculates the rotating angle of the stepping motor according to the target dripping speed, and the rotating angle of the stepping motor is adjusted according to the target dripping speed; the eccentric cam is driven to rotate to adjust the infusion hose gap; the dripping speed monitoring module is used for calculating the actual dripping speed through pulse counting and timestamp recording; the dripping speed time limiting module automatically calculates the target dripping speed according to the infusion completion time set by a user, the total liquid amount and the coefficient of the number of drops per milliliter, a stepping motor drives an eccentric cam to calculate the dripping speed, meanwhile, the remaining liquid amount and the actual dripping speed are continuously monitored, the actual dripping speed is compared with a medicine threshold value in real time, and parameters of the stepping motor are dynamically adjusted; by means of multi-mode monitoring and automatic speed reduction, the requirement for human intervention is reduced, and control errors are reduced.

Description

Technical Field

[0001] This invention relates to the field of infusion control technology, and in particular to an infusion drip rate control and volume warning device. Background Technology

[0002] In clinical treatment, intravenous infusion is one of the core means of drug delivery. Its safety and accuracy directly affect the patient's prognosis. Chemotherapy drugs such as doxorubicin may cause cardiotoxicity if the infusion rate is too fast. In addition, the management of infusion volume is also critical. When the remaining fluid volume is less than 5%, if the infusion bottle is not replaced or the infusion is not stopped in time, air may enter the blood vessels and form an air embolism, which can endanger life.

[0003] Traditional intravenous infusion methods rely on medical staff manually adjusting the infusion set rollers to control the drip rate and visually observing the fluid level to warn of remaining fluid volume. However, manual adjustment has significant limitations: firstly, the drip rate control accuracy is low, affected by factors such as the experience of medical staff and ambient light interference, resulting in a large deviation between the actual drip rate and the set value; secondly, it cannot achieve 24-hour continuous monitoring, and in nighttime or emergency scenarios, medical staff cannot easily monitor the infusion status in real time, leading to delayed responses to abnormal situations.

[0004] Therefore, it is necessary to provide a new infusion drip rate control and volume early warning device to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides an infusion drip rate control and liquid volume early warning device.

[0006] The infusion drip rate control device provided by the present invention includes: a drip rate direct control module, which includes a stepper motor, an eccentric cam and an infusion tubing clamping mechanism. The stepper motor is rotated by a microcontroller. The microcontroller calculates the rotation angle of the stepper motor according to the target drip rate, drives the eccentric cam to rotate, and adjusts the gap of the infusion tubing, thereby changing the liquid flow rate. The drip rate monitoring module is used to calculate the actual drip rate by recording pulse counts and timestamps. The drip rate time limit module automatically calculates the target drip rate based on the user-set infusion completion time, total fluid volume, and the number of drops per milliliter coefficient. The stepper motor drives the eccentric cam to execute the drip rate calculation, while continuously monitoring the remaining fluid volume and the actual drip rate. If the drip rate slows down due to changes in the patient's position, the actual drip rate is compared with the drug threshold in real time, and the stepper motor parameters are dynamically adjusted to ensure that the infusion is completed on time.

[0007] Furthermore, the drip rate monitoring module includes an infrared drip sensor and a signal processing circuit. The infrared drip sensor is installed below the dropper, and the signal processing circuit converts the light signal into a digital pulse signal. When the medicine drips, the infrared light is blocked, and the infrared drip sensor outputs a low level. When there is no dripping, it outputs a high level. The actual drip rate is calculated by counting pulses and recording timestamps.

[0008] Furthermore, the outer edge of the eccentric cam is designed as an asymmetrical arc structure, and the gap between it and the infusion tubing is controlled by changing the rotation angle. The maximum eccentricity of the eccentric cam is 5mm, the minimum gap is 0.2mm, and the maximum gap is 2mm.

[0009] Furthermore, the edge of the eccentric cam is wrapped with a silicone pad.

[0010] Furthermore, the infusion tubing clamping mechanism includes a cover, a rear cover, and a fixing frame. One side of the cover has a slot for the infusion tubing to pass through, and the inner side of the slot has a through groove communicating with the inner cavity of the cover. The fixing frame is fixedly installed inside the cover. The stepper motor and the microcontroller are both fixedly installed on the fixing frame. The eccentric cam is fixedly connected to the output end of the stepper motor, and the eccentric cam is rotatably installed on the fixing frame. One end of the eccentric cam passes through the through groove and fits against the surface of the infusion tubing. The rear cover is engaged with the cover.

[0011] Furthermore, the target drip rate is calculated using the following formula: .

[0012] Another aspect of the present invention provides an infusion volume early warning device, comprising: a pressure sensor installed near the drip tube outlet end for detecting blockage of the infusion tubing; The liquid level electrode is used to detect changes in conductivity through high-frequency AC signals and to issue an alarm when the remaining liquid volume is less than a preset threshold. The audible and visual alarm is used to trigger an audible and visual alarm and control the stepper motor to automatically reduce speed when any of the following occurs: the actual drip rate exceeds the drug safety limit, the infusion tubing is blocked, or the remaining fluid volume is less than a preset threshold.

[0013] Furthermore, the electrode pairs of the liquid level electrode are installed at the bottom of the infusion bottle with a spacing of 2 cm.

[0014] Compared with related technologies, the infusion drip rate control and liquid volume early warning device provided by the present invention has the following beneficial effects: 1. In this invention, a microcontroller controls a stepper motor to rotate. The microcontroller calculates the rotation angle of the stepper motor based on the target drip rate, drives the eccentric cam to rotate, and adjusts the gap of the infusion tubing, thereby changing the liquid flow rate, avoiding manual adjustment and reducing control errors.

[0015] 2. This invention uses multimodal monitoring, including pressure sensors, liquid level electrodes, and infrared drop count sensors, to cover the risks of blockage, leakage, and air embolism. It utilizes audible and visual alarms and automatic rate reduction to reduce the need for human intervention and eliminates the need to monitor the infusion status in real time, thus breaking through the traditional single alarm mode. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of the infusion drip rate control device provided by the present invention; Figure 2 This is a schematic diagram of the infusion tubing clamping mechanism provided by the present invention; Figure 3 The structural block diagram of the infusion volume early warning device provided by the present invention.

[0017] The following are the labels in the diagram: 1. Stepper motor; 2. Eccentric cam; 3. Microcontroller; 4. Cover; 5. Back cover; 6. Fixing bracket; 7. Slot; 8. Through slot. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Please refer to the following: Figure 1 , Figure 2 as well as Figure 3 ,in, Figure 1 This is a structural block diagram of the infusion drip rate control device provided by the present invention; Figure 2 This is a schematic diagram of the infusion tubing clamping mechanism provided by the present invention; Figure 3 The structural block diagram of the infusion volume early warning device provided by the present invention.

[0020] In the specific implementation process, such as Figure 1 As shown, the infusion drip rate control device includes: a drip rate direct control module, which includes a stepper motor 1, an eccentric cam 2, and an infusion tubing clamping mechanism. The stepper motor 1 is rotated by a microcontroller 3. The microcontroller 3 calculates the rotation angle of the stepper motor 1 according to the target drip rate, drives the eccentric cam 2 to rotate, and adjusts the gap of the infusion tubing, thereby changing the liquid flow rate. The stepper motor 1 is a two-phase hybrid stepper motor 1, and the rotation period of the eccentric cam 2 is linearly related to the drip rate. The drip rate monitoring module is used to calculate the actual drip rate by recording pulse counts and timestamps. The drip rate time setting module automatically calculates the target drip rate based on the user-defined infusion completion time, total fluid volume, and drip rate coefficient per milliliter. Stepper motor 1 drives eccentric cam 2 to perform the drip rate calculation, while continuously monitoring the remaining fluid volume and the actual drip rate. If the drip rate slows down due to changes in patient position, the module compares the actual drip rate with the drug threshold in real time and dynamically adjusts the parameters of stepper motor 1 to ensure timely completion of the infusion. The target drip rate is calculated using the following formula: ; Simultaneously, based on the target drip rate, the microcontroller calculates the required rotation angle of the cam using a formula:

[0021] in, For the minimum rotation angle, This represents the maximum rotation angle.

[0022] It should be noted that the drip rate monitoring module includes an infrared drop count sensor and a signal processing circuit. The infrared drop count sensor is installed below the dropper, and the signal processing circuit converts the light signal into a digital pulse signal. When the medicine drips, the infrared light is blocked, and the infrared drop count sensor outputs a low level. When there is no dripping, it outputs a high level. The actual drip rate is calculated by counting pulses and recording timestamps.

[0023] In some embodiments, the outer edge of the eccentric cam 2 is designed as an asymmetrical arc structure. The gap between the eccentric cam 2 and the infusion tubing is controlled by changing the rotation angle. The maximum eccentricity of the eccentric cam 2 is 5mm, the minimum gap is 0.2mm to prevent the tubing from closing, and the maximum gap of 2mm is suitable for liquids of different viscosities. The involute eccentric cam 2 has an eccentricity that changes linearly with the rotation angle, with a rotation range of 0°-180°.

[0024] Preferably, the edge of the eccentric cam 2 is wrapped with a silicone pad to prevent excessive compression from damaging the infusion tubing.

[0025] It should be noted that the reference Figure 2 As shown, the infusion tubing clamping mechanism includes a cover 4, a rear cover 5, and a fixing frame 6. A slot 7 for the infusion tubing to pass through is provided on one side of the cover 4. A through groove 8 communicating with the inner cavity of the cover 4 is provided on the inner side of the slot 7. The fixing frame 6 is fixedly installed inside the cover 4. The stepper motor 1 and the microcontroller 3 are both fixedly installed on the fixing frame 6. The eccentric cam 2 is fixedly connected to the output end of the stepper motor 1, and the eccentric cam 2 is rotatably installed on the fixing frame 6. One end of the eccentric cam 2 passes through the through groove 8 and fits against the surface of the infusion tubing. The rear cover 5 is engaged with the cover 4.

[0026] Example 2 In a specific implementation process, refer to Figure 3 As shown, an infusion volume early warning device includes: a pressure sensor installed near the drip tube outlet to avoid interference from venous reflux, used to detect blockage of the infusion tubing and prevent uncontrolled drip rate due to abnormal pressure; The liquid level electrode is used to detect changes in conductivity through high-frequency AC signals and to issue an alarm when the remaining liquid volume is less than a preset threshold (e.g., <10mL). The electrode pairs of the liquid level electrode are installed at the bottom of the infusion bottle with a spacing of 2cm to avoid the polarization effect of the DC electrode. The audible and visual alarm is used to trigger an audible and visual alarm and control the stepper motor 1 to automatically reduce speed when any of the following occurs: the actual drip rate exceeds the drug safety limit, the infusion tubing is blocked, or the remaining liquid volume is less than a preset threshold.

[0027] The specific operation process is as follows: Equipment installation; Initialization: Read preset parameters (total liquid volume, time, safety threshold). Calculate the target drip rate and start stepper motor 1 to adjust the cam; Real-time monitoring: The drip rate sensor monitors the actual drip rate, the pressure sensor monitors the pipeline status, and the level electrode monitors the remaining liquid volume; Data processing: drip rate deviation correction, pressure anomaly handling, and liquid volume warning; End the infusion or continue the cycle.

[0028] According to embodiments of the present invention, a computing device that can be used to implement the above method includes a processor and a memory; The processor can be a multi-core processor or include multiple processors. In some embodiments, the processor may include a general-purpose main processor and one or more special coprocessors, such as a graphics processing unit (GPU), a digital signal processor (DSP), etc. In some embodiments, the processor may be implemented using custom circuitry, such as an application-specific integrated circuit (ASIC) or a field-programmable gate array (FPGA).

[0029] Memory can include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. ROM can store static data or instructions required by the processor or other modules of the computer. Permanent storage devices can be read-write storage devices. Permanent storage devices can be non-volatile storage devices that retain stored instructions and data even when the computer is powered off. In some embodiments, permanent storage devices use mass storage devices (e.g., magnetic or optical disks, flash memory) as permanent storage devices. In other embodiments, permanent storage devices can be removable storage devices (e.g., floppy disks, optical drives). System memory can be a read-write storage device or a volatile read-write storage device, such as dynamic random access memory. System memory can store some or all of the instructions and data required by the processor during operation. Furthermore, memory can include any combination of computer-readable storage media, including various types of semiconductor memory chips (DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and disks and / or optical disks can also be used. In some implementations, the memory may include removable storage devices that are readable and / or writable, such as laser discs (CDs), read-only digital versatile optical discs (e.g., DVD-ROMs, dual-layer DVD-ROMs), read-only Blu-ray discs, ultra-high density optical discs, flash memory cards (e.g., SD cards, mini SD cards, Micro-SD cards, etc.), magnetic floppy disks, etc. Computer-readable storage media do not include carrier waves and transient electronic signals transmitted wirelessly or via wired connections.

[0030] It should be understood that, unless otherwise expressly stated herein, there is no strict order restriction on the execution of the above steps, and these steps may be executed in other orders. Moreover, at least some steps in the processes involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be performed alternately or in turn with other steps or at least some of the steps or stages in other steps.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment includes only one independent technical solution. This narrative style is merely for clarity. 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 can be understood by those skilled in the art.

Claims

1. An infusion drip rate control device, characterized in that, include: The drip rate direct control module includes a stepper motor (1), an eccentric cam (2) and an infusion tubing clamping mechanism. The stepper motor (1) is rotated by a microcontroller (3). The microcontroller (3) calculates the rotation angle of the stepper motor (1) according to the target drip rate, drives the eccentric cam (2) to rotate, adjusts the gap of the infusion tubing, and thus changes the liquid flow rate. The drip rate monitoring module is used to calculate the actual drip rate by recording pulse counts and timestamps. The drip rate time limit module automatically calculates the target drip rate based on the user-set infusion completion time, total volume and drip rate coefficient per milliliter. The stepper motor (1) drives the eccentric cam (2) to calculate the drip rate. At the same time, it continuously monitors the remaining volume and the actual drip rate, compares the actual drip rate with the drug threshold in real time, and dynamically adjusts the parameters of the stepper motor (1) to ensure that the infusion is completed on time.

2. The infusion drip rate control device according to claim 1, characterized in that, The drip rate monitoring module includes an infrared drip sensor and a signal processing circuit. The infrared drip sensor is installed below the dropper. The signal processing circuit converts the light signal into a digital pulse signal. When the medicine drips, the infrared light is blocked, and the infrared drip sensor outputs a low level. When there is no drip, it outputs a high level. The actual drip rate is calculated by counting pulses and recording timestamps.

3. The infusion drip rate control device according to claim 1, characterized in that, The outer edge of the eccentric cam (2) is designed as an asymmetrical arc structure. The gap between the eccentric cam (2) and the infusion tubing is controlled by the rotation angle. The maximum eccentricity of the eccentric cam (2) is 5mm, the minimum gap is 0.2mm, and the maximum gap is 2mm.

4. The infusion drip rate control and volume early warning device according to claim 3, characterized in that, The edge of the eccentric cam (2) is wrapped with a silicone pad.

5. The infusion drip rate control device according to claim 1, characterized in that, The infusion tubing clamping mechanism includes a cover (4), a rear cover (5), and a fixing frame (6). A slot (7) for the infusion tubing to pass through is provided on one side of the cover (4). A through groove (8) communicating with the inner cavity of the cover (4) is provided on the inner side of the slot (7). The fixing frame (6) is fixedly installed inside the cover (4). The stepper motor (1) and the microcontroller (3) are both fixedly installed on the fixing frame (6). The eccentric cam (2) is fixedly connected to the output end of the stepper motor (1), and the eccentric cam (2) is rotatably installed on the fixing frame (6). One end of the eccentric cam (2) passes through the through groove (8) and is in contact with the surface of the infusion tubing. The rear cover (5) is engaged with the cover (4).

6. The infusion drip rate control device according to claim 1, characterized in that, The target drip rate is calculated using the following formula: Target drip rate = (Total volume × Drops per milliliter coefficient) / Set time.

7. An infusion volume early warning device, applicable to the infusion drip rate control device according to any one of claims 1-6, characterized in that, include: A pressure sensor, installed near the drip outlet, is used to detect blockages in the infusion tubing; The liquid level electrode is used to detect changes in conductivity through high-frequency AC signals and to issue an alarm when the remaining liquid volume is less than a preset threshold. The audible and visual alarm is used to trigger an audible and visual alarm and control the stepper motor (1) to automatically reduce its speed when any of the following occurs: the actual drip rate exceeds the drug safety limit, the infusion tubing is blocked, or the remaining liquid volume is less than a preset threshold.

8. The infusion drip rate control and volume early warning device according to claim 7, characterized in that, The electrode pairs of the liquid level electrode are installed at the bottom of the infusion bottle with a spacing of 2 cm.

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