Control method for reducing needle leakage and liquid leakage of indwelling needle and indwelling needle infusion monitoring system

Abstract

The invention provides a control method for reducing needle leakage and liquid leakage of an indwelling needle and an indwelling needle infusion monitoring system.The control method comprises the following steps that the maximum tolerance pressure of a blood vessel punctured by the indwelling needle is obtained according to the age and blood pressure of a patient punctured by the indwelling needle and the fullness and size of the punctured blood vessel; according to the maximum tolerance pressure of the blood vessel, the maximum flow speed of the conveyed medicine is obtained; according to the maximum flow speed of the medicine, the actual flow speed of conveyed medicine is adjusted. For a patient subjected to emergency rescue, the maximum tolerance pressure of the blood vessel punctured by the indwelling needle is obtained, then the maximum flow speed of the conveyed medicine is obtained according to the maximum tolerance pressure of the blood vessel, and then the actual flow speed of the conveyed medicine is adjusted according to the maximum flow speed of the medicine. According to the change of the fullness degree of the blood vessel lumen, the actual flow speed of the conveyed medicine is adjusted, and the probability of needle leakage and liquid leakage of the remaining needle is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a control method for reducing needle leakage and liquid leakage of an indwelling needle and an indwelling needle infusion monitoring system. Background Art

[0002] As a core device for clinical intravenous therapy, the indwelling needle needs to achieve long-term and stable catheter indwelling and liquid medicine infusion for its core function. Infusion extravasation caused by indwelling needle leakage (the indwelling needle detaching from the blood vessel), especially hypertonic liquid medicine, will bring quite a lot of pain to patients. Therefore, it is necessary to monitor the needle leakage and liquid leakage conditions of the indwelling needle. For example, an indwelling needle extravasation prevention monitoring device disclosed in CN201921272237.X can perform real-time monitoring on the puncture site of a patient, and emit an audible and visual alarm signal when the intravenous infusion extravasation occurs, which is convenient for medical staff to timely discover the liquid medicine extravasation phenomenon and deal with it in time to reduce the pain of patients.

[0003] Generally, the blood vessels for indwelling needle puncture should be selected as thick, straight and long ones. However, people are different, and blood vessels are also different. Some blood vessels are very short, some are very thin, and some have many curved venous sinuses, and this situation is more common in children and the elderly. In case of sudden emergency rescue medication, high-risk drugs such as mannitol, adrenaline, dopamine, etc. are often used for rescuing patients. This type of drugs causes great damage to blood vessels, and the blood flow velocity in peripheral blood vessels is also very slow. Therefore, once the drug irritation is large, even if the patient does not move, needle leakage may occur. In addition, temperature changes, for example, in the case of being cold, the peripheral blood vessels will contract, become very thin, the blood flow is slower, and the change of the fullness degree of the blood vessel lumen will also increase the probability of needle leakage. In view of the foregoing situation, it is necessary to provide a control method for reducing needle leakage and liquid leakage of an indwelling needle and an indwelling needle infusion monitoring system. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art. The first object of the present invention is to provide a control method for reducing needle leakage and liquid leakage of an indwelling needle, and the second object of the present invention is to provide an indwelling needle infusion monitoring system based on the foregoing control method.

[0005] To achieve the above first object, the present invention adopts the following technical solution: A control method for reducing needle leakage and liquid leakage of an indwelling needle, comprising the following steps: obtaining the maximum tolerable pressure of the blood vessel punctured by the indwelling needle according to the age, blood pressure of the patient punctured by the indwelling needle, and the fullness degree and size of the punctured blood vessel; obtaining the maximum flow rate of the delivered drug according to the maximum tolerable pressure of the blood vessel; and adjusting the actual flow rate of the delivered drug according to the maximum flow rate of the drug.

[0006] For the patients using indwelling needles, the maximum tolerable pressure of the blood vessel punctured by the indwelling needle is obtained, and then according to the maximum tolerable pressure of the blood vessel, the maximum flow rate of the delivered drug is obtained, and then according to the maximum flow rate of the drug, the actual flow rate of the delivered drug is adjusted. According to the change of the blood vessel lumen abundance, the present invention adjusts the actual flow rate of the delivered drug, reducing the probability of needle leakage and liquid leakage of the indwelling needle.

[0007] In a preferred embodiment of the present invention, the specific method for obtaining the maximum tolerable pressure of the blood vessel punctured by the indwelling needle is: through an ultrasonic sensor detection device, detecting the abundance and size of the blood vessel, and obtaining the maximum tolerable pressure P of the blood vessel according to the following formula max ,

[0008]

[0009] where E is the elastic modulus of the blood vessel wall, related to the age and blood pressure of the patient, r is the inner radius of the blood vessel, and h is the thickness of the blood vessel wall.

[0010] According to the above technical solution, the maximum tolerable pressure of the blood vessel is calculated based on the elastic modulus of the punctured blood vessel wall, the inner radius of the blood vessel, and the thickness of the blood vessel wall, and the measurement is accurate.

[0011] In a preferred embodiment of the present invention, the specific method for obtaining the elastic modulus E of the blood vessel wall is: obtaining the age and blood pressure of the patient, and obtaining the elastic modulus of the blood vessel according to the following formula,

[0012]

[0013] where A is the age of the patient, SBP is the systolic blood pressure, DBP is the diastolic blood pressure, and k is the fitting coefficient obtained from experiments.

[0014] According to the above technical solution, the elastic modulus of the blood vessel wall is calculated based on the age, systolic blood pressure, and diastolic blood pressure of the patient. Compared with estimating the elastic modulus of the blood vessel only by age, the present invention takes into account the systolic blood pressure and diastolic blood pressure of the patient, and the measurement is more accurate.

[0015] In a preferred embodiment of the present invention, the specific method for obtaining the maximum flow rate of the delivered drug according to the maximum tolerable pressure of the blood vessel is:

[0016]

[0017] where Q is the maximum flow rate of the drug, P max is the maximum tolerable pressure of the blood vessel, r is the inner radius of the blood vessel, η is the blood viscosity of the patient, and L is the length of the blood vessel from the injection position to the drug action target position or the most distal blood vessel part.

[0018] In the above technical solution, the maximum flow rate of the drug is calculated based on the maximum tolerable pressure of the blood vessel, the inner radius of the blood vessel, the blood viscosity, and the length of the blood vessel where the drug acts. Considering the error caused by the difference in human blood viscosity, the measurement is more accurate.

[0019] In a preferred embodiment of the present invention, the actual flow rate of the drug is 4% - 10% of the maximum flow rate of the drug.

[0020] In the above technical solution, the value of the actual flow rate is reasonable, reducing the damage of the drug to the blood vessel.

[0021] In another preferred embodiment of the present invention, during the process of delivering the drug, the pressure change in the blood vessel and the drug concentration change in the blood vessel are monitored in real time; according to the pressure change in the blood vessel and the drug concentration change in the blood vessel, it is judged whether there is a needle leakage phenomenon in the indwelling needle; when the pressure and drug concentration in the blood vessel are monitored to be abnormal, the alarm issues an alarm.

[0022] In the above technical solution, the pressure change in the blood vessel and the drug concentration change are combined to form a dynamic monitoring system. When the abnormalities of the pressure and drug concentration in the blood vessel are monitored, an alarm is immediately issued to remind the medical staff to handle it.

[0023] In another preferred embodiment of the present invention, a pressure sensor capable of extending into the blood vessel is provided at the needle head of the indwelling needle, and the pressure sensor is used to monitor the pressure change in the blood vessel in real time; the drug concentration change in the blood vessel is monitored in real time through a drug concentration sensor or blood analysis technology.

[0024] In another preferred embodiment of the present invention, the specific method for judging whether there is a needle leakage phenomenon in the indwelling needle according to the pressure change in the blood vessel and the drug concentration change in the blood vessel is as follows: when the pressure in the blood vessel is monitored to be lower than the normal value and the drug concentration is low or there is no significant increase, it means that the drug may leak outside the blood vessel, resulting in a pressure drop and the concentration unable to rise normally, and it is determined as a needle leakage phenomenon; when the pressure in the blood vessel is monitored to increase or fluctuate and the drug concentration change is abnormal, there is a situation where the drug is injected into the artery or the pressure in the blood vessel fluctuates abnormally during the infusion process, and an alarm is immediately issued.

[0025] To achieve the above second object, the present invention adopts the following technical solution: an indwelling needle infusion monitoring system, including a controller, an indwelling needle, and an infusion tube connected to the liquid inlet of the indwelling needle. The indwelling needle is fixed by a fixed dressing. A flow rate regulating valve for regulating the drug flow rate is provided on the infusion tube, and the enabling end of the flow rate regulating valve is connected to the speed regulating control end of the controller; the controller obtains the patient's age, blood pressure, and the fullness and size of the punctured blood vessel, and determines the maximum tolerable pressure of the blood vessel punctured by the indwelling needle; based on the maximum tolerable pressure of the blood vessel, the maximum flow rate of the delivered drug is obtained; according to the maximum flow rate of the drug, the flow rate regulating valve is controlled to adjust the actual flow rate of the delivered drug.

[0026] In another preferred embodiment of the present invention, the indwelling needle infusion monitoring system further includes an ultrasonic sensor detection device. The signal output end of the ultrasonic sensor detection device is connected to the ultrasonic input end of the controller. The ultrasonic sensor detection device is used to detect the abundance and size of the patient's blood vessels and transmit them to the controller; and / or the monitoring system further includes a pressure sensor and a drug concentration detection device. The signal output ends of the pressure sensor and the drug concentration detection device are respectively connected to the pressure input end and the concentration input end of the controller. The pressure sensor is arranged at the needle head of the indwelling needle and can extend into the blood vessel. The pressure sensor is used to monitor the pressure change in the blood vessel and transmit it to the controller. The drug concentration detection device monitors the drug concentration change in the blood vessel through a drug concentration sensor or blood analysis technology and transmits it to the controller.

[0027] Compared with the prior art, the preferred technical solution of the present invention has the following beneficial effects: For patients using indwelling needles, according to the change in the abundance of the blood vessel lumen, the actual flow rate of the delivered drug is adjusted, reducing the probability of needle leakage and fluid leakage of the indwelling needle and reducing the occurrence of medical accidents caused by needle leakage; during the process of delivering the drug, the pressure change in the blood vessel and the drug concentration change in the blood vessel are monitored in real time. By combining the pressure change in the blood vessel and the drug concentration change, a dynamic monitoring system is formed. When abnormal pressure and drug concentration in the blood vessel are detected, an alarm is immediately issued to remind medical staff to handle it.

[0028] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0030] Figure 1 is a schematic diagram of the indwelling needle infusion monitoring system of the embodiment.

[0031] The reference numerals in the accompanying drawings of the specification include: controller 1, indwelling needle 2, infusion tube 3, flow rate regulating valve 4, ultrasonic sensor detection device 5, pressure sensor 6, drug concentration detection device 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "lateral", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Embodiment 1

[0036] This embodiment provides a control method for reducing needle leakage and liquid leakage of an indwelling needle. In a preferred embodiment, the control method includes the following steps:

[0037] According to the age and blood pressure of the patient punctured by the indwelling needle, as well as the abundance and size of the punctured blood vessel, obtain the maximum tolerable pressure of the blood vessel punctured by the indwelling needle;

[0038] According to the maximum tolerable pressure of the blood vessel, obtain the maximum flow rate of the delivered drug;

[0039] According to the maximum flow rate of the drug, adjust the actual flow rate of the delivered drug, and the actual flow rate of the drug is 4% - 10% of the maximum flow rate of the drug.

[0040] In the present invention, the specific method for obtaining the maximum tolerable pressure of the blood vessel punctured by the indwelling needle is as follows: As Figure 1 shown, through the ultrasonic sensor detection device 5, detect the abundance and size of the blood vessel, and the controller 1 obtains the maximum tolerable pressure P of the blood vessel according to the following formula max (unit: Pa),

[0041]

[0042] where E is the elastic modulus of the blood vessel wall (unit: Pa), which is related to the age and blood pressure of the patient, r is the inner radius of the blood vessel (unit: m), h is the thickness of the blood vessel wall (unit: m), and the inner radius of the blood vessel and the thickness of the blood vessel wall are obtained by the ultrasonic sensor detection device.

[0043] Specifically, the specific method for obtaining the elastic modulus E of the blood vessel wall is as follows: Obtain the age and blood pressure of the patient, and calculate the elastic modulus of the blood vessel according to the following formula.

[0044]

[0045] where A is the age of the patient (in years), SBP is the systolic blood pressure (in Pa), DBP is the diastolic blood pressure (in Pa), k is the fitting coefficient obtained from experiments (in Pa / year), and the systolic and diastolic blood pressures can be measured using an electronic sphygmomanometer in the prior art.

[0046] In the present invention, the specific method for obtaining the maximum flow rate of the delivered drug according to the maximum tolerable pressure of the blood vessel is as follows:

[0047]

[0048] where Q is the maximum flow rate of the drug, P max is the maximum tolerable pressure of the blood vessel, r is the inner radius of the blood vessel, η is the blood viscosity of the patient (obtained by blood collection), L is the length of the blood vessel from the injection position to the drug action target position or the most distal blood vessel part, and the value of L is estimated by the doctor according to experience.

[0049] As Figure 1 shown, in another preferred embodiment, during the process of delivering the drug, the pressure change in the blood vessel is monitored in real time (specifically, a pressure sensor 6 that can extend into the blood vessel can be set at the needle tip of the indwelling needle 2 to monitor the pressure change in the blood vessel in real time) and the drug concentration change in the blood vessel is monitored in real time (specifically, the drug concentration change in the blood vessel can be monitored in real time through a drug concentration sensor or blood analysis technology); according to the pressure change in the blood vessel and the drug concentration change in the blood vessel, it is judged whether there is a needle leakage phenomenon in the indwelling needle 2; when abnormal pressure and drug concentration in the blood vessel are detected, the alarm sounds an alarm.

[0050] During the process of delivering the drug, monitor the pressure change in the blood vessel. Especially at the beginning of the infusion, a sudden change in pressure (such as a decrease) may indicate an external leakage of the blood vessel. If the pressure in the blood vessel is significantly lower than the normal value, it indicates a needle leakage.

[0051] Monitor the drug concentration delivered at the same time inside the blood vessel and at the needle tip of the indwelling needle 2. During normal infusion, the drug concentration in the blood vessel should show a stable growth trend. If the drug concentration is too low or there is no significant increase, it may mean that the drug has not fully entered the blood vessel; in the case of needle leakage, the drug concentration change will not only be lower than expected, but may also have large fluctuations, showing uneven drug distribution.

[0052] In the present invention, the specific method for determining whether there is a needle leakage in the indwelling needle 2 according to the pressure change in the blood vessel and the drug concentration change in the blood vessel is as follows: when it is monitored that the pressure in the blood vessel is lower than the normal value and the drug concentration is low or there is no significant increase, it means that the drug may leak out of the blood vessel, resulting in a decrease in pressure and an abnormal increase in concentration, and it is determined as a needle leakage phenomenon; when it is monitored that the pressure in the blood vessel increases or fluctuates and the drug concentration changes abnormally, it may be because the drug is injected into the artery or the pressure in the blood vessel fluctuates abnormally during the infusion process, and an alarm is immediately issued.

[0053] Embodiment 2

[0054] This embodiment provides an indwelling needle infusion monitoring system based on the control method for reducing needle leakage and liquid leakage in Embodiment 1, as Figure 1 shown. The monitoring system includes a controller 1, an indwelling needle 2, and an infusion tube 3 connected to the liquid inlet of the indwelling needle 2. The indwelling needle 2 is fixed by a fixing dressing (the specific fixing method is the prior art and will not be described in detail here). A flow rate regulating valve 4 for regulating the drug flow rate is provided on the infusion tube 3, and the enabling end of the flow rate regulating valve 4 is connected to the speed regulating control end of the controller 1.

[0055] The controller 1 obtains the patient's age, blood pressure, as well as the abundance and size of the punctured blood vessel. The controller 1 determines the maximum tolerable pressure of the blood vessel punctured by the indwelling needle 2 according to the control method of Embodiment 1, obtains the maximum flow rate of the delivered drug based on the maximum tolerable pressure of the blood vessel, and controls the flow rate regulating valve 4 to adjust the actual flow rate of the delivered drug according to the maximum flow rate of the drug. The flow rate of the drug delivered by the infusion tube 3 can be measured by a flow rate sensor built into the flow rate regulating valve 4 or provided independently of the flow rate regulating valve 4 and fed back to the controller 1. The controller 1 compares the measured drug flow rate with the actual flow rate to be adjusted, and makes the two consistent or close by adjusting the flow rate regulating valve 4.

[0056] The monitoring system further includes an ultrasonic sensor detection device 5. The signal output end of the ultrasonic sensor detection device 5 is connected to the ultrasonic input end of the controller 1. The ultrasonic sensor detection device 5 is used to detect the abundance and size of the patient's blood vessel and transmit them to the controller 1.

[0057] Further preferably, the monitoring system further comprises a pressure sensor 6 and a drug concentration detection device 7, and the signal output ends of the pressure sensor 6 and the drug concentration detection device 7 are respectively connected to the pressure input end and the concentration input end of the controller 1. The pressure sensor 6 is arranged on the needle of the indwelling needle 2 and can be inserted into the blood vessel. The pressure sensor 6 is used to monitor the pressure change in the blood vessel and transmit it to the controller 1. The pressure sensor 6 adopts the existing technology, such as the pressure sensor for measuring the pressure in the blood vessel disclosed in CN200910169077.0, CN201980011748.2, or CN201480058654.8; the drug concentration detection device 7 monitors the drug concentration change in the blood vessel through a drug concentration sensor or blood analysis technology (such as fluorescent labeled drugs, near infrared sensors, etc.), and transmits it to the controller 1. The drug concentration sensor can adopt the existing technology, such as the blood vessel sensing probe disclosed in CN201611236717.1, or the substance concentration monitoring system disclosed in CN202111186556.0.

[0058] In this embodiment, the ultrasonic sensor detection device 5 can be arranged at the handle of the indwelling needle or can be arranged externally, and the drug concentration detection device 7 is arranged at the needle head of the indwelling needle 2 and can be inserted into the blood vessel, and can specifically adopt an enzyme sensor or an electrochemical sensor. Different detection sensors can be arranged corresponding to different drugs such as mannitol, epinephrine, dopamine, etc. and marked on the outside of the indwelling needle.

[0059] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for reducing needle leakage from an indwelling needle, characterized in that: The steps include: According to the age, blood pressure, and fullness and size of the punctured blood vessel of the patient undergoing indwelling needle puncture, the maximum tolerable pressure of the blood vessel punctured by the indwelling needle is obtained; According to the maximum tolerable pressure of the blood vessels, the maximum flow rate of the delivered drug is obtained; According to the maximum flow rate of the drug, the actual flow rate of the delivered drug is adjusted.

2. The control method for reducing needle leakage of indwelling needle according to claim 1, characterized in that: The specific method for obtaining the maximum tolerable pressure of the blood vessel punctured by the indwelling needle is: The fullness and size of the blood vessels are detected by an ultrasonic sensor detection device, and the maximum tolerable pressure P of the blood vessels is calculated according to the following formula: max , Among them, E is the elastic modulus of the blood vessel wall, which is related to the patient's age and blood pressure, r is the inner radius of the blood vessel, and h is the thickness of the blood vessel wall.

3. The control method for reducing needle leakage of indwelling needle according to claim 2, characterized in that: The specific method for obtaining the elastic modulus E of the blood vessel wall is: Obtain the patient's age and blood pressure, and calculate the elastic modulus of the blood vessel according to the following formula: Among them, A is the patient's age, SBP is systolic blood pressure, DBP is diastolic blood pressure, and k is the fitting coefficient obtained by experiment.

4. The control method for reducing needle leakage of indwelling needle according to claim 1, characterized in that: According to the maximum tolerable pressure of the blood vessel, the specific method for obtaining the maximum flow rate of the delivered drug is: Where Q is the maximum flow rate of the drug, P max is the maximum tolerable pressure of the blood vessel, r is the inner radius of the blood vessel, η is the blood viscosity of the patient, and L is the length of the blood vessel from the injection site to the target site of the drug or the most distal vascular site.

5. The control method for reducing needle leakage of indwelling needle according to claim 1, characterized in that: The actual flow rate of the drug is 4% to 10% of the maximum flow rate of the drug.

6. The control method for reducing needle leakage of an indwelling needle according to any one of claims 1 to 5, characterized in that: During drug delivery, real-time monitoring of intravascular pressure changes and intravascular drug concentration changes; According to the changes in intravascular pressure and intravascular drug concentration, determine whether the indwelling needle has leakage; When abnormal intravascular pressure and drug concentration are detected, the alarm will sound.

7. The control method for reducing needle leakage of indwelling needle according to claim 6, characterized in that: The needle of the indwelling needle is provided with a pressure sensor that can be inserted into the blood vessel, and the pressure sensor is used to monitor the pressure changes in the blood vessel in real time; The changes in drug concentration in blood vessels can be monitored in real time through drug concentration sensors or blood analysis technology.

8. The control method for reducing needle leakage of indwelling needle according to claim 6, characterized in that: Based on the changes in intravascular pressure and intravascular drug concentration, the specific method to determine whether the indwelling needle has leakage is as follows: When the intravascular pressure is monitored to be lower than normal, and the drug concentration is low or has no significant increase, it means that the drug may have leaked out of the blood vessel, causing the pressure to drop and the concentration to fail to rise normally, which is determined as a missed needle phenomenon; When it is monitored that the intravascular pressure increases or fluctuates, and the drug concentration changes abnormally, it means that the drug has been injected into the artery, or the intravascular pressure has fluctuated abnormally during the infusion process, and an alarm will be issued immediately.

9. An indwelling needle infusion monitoring system based on the control method for reducing indwelling needle leakage according to any one of claims 1 to 8, characterized in that: It comprises a controller, an indwelling needle and an infusion tube connected to the liquid inlet of the indwelling needle, the indwelling needle is fixed by a fixing patch, the infusion tube is provided with a flow rate regulating valve for regulating the flow rate of the drug, and the enabling end of the flow rate regulating valve is connected to the speed control end of the controller; The controller obtains the patient's age, blood pressure, and the fullness and size of the punctured blood vessel to determine the maximum tolerable pressure of the blood vessel punctured by the indwelling needle; obtains the maximum flow rate of the delivered drug based on the maximum tolerable pressure of the blood vessel; and controls the flow rate regulating valve based on the maximum flow rate of the drug to adjust the actual flow rate of the delivered drug.

10. The indwelling needle infusion monitoring system according to claim 9, characterized in that: It also includes an ultrasonic sensor detection device, the signal output end of the ultrasonic sensor detection device is connected to the ultrasonic input end of the controller, and the ultrasonic sensor detection device is used to detect the fullness and size of the patient's blood vessels and transmit them to the controller; And / or the monitoring system also includes a pressure sensor and a drug concentration detection device, the signal output ends of the pressure sensor and the drug concentration detection device are respectively connected to the pressure input end and the concentration input end of the controller, the pressure sensor is arranged on the needle head of the indwelling needle and can be inserted into the blood vessel, the pressure sensor is used to monitor the pressure changes in the blood vessel and transmit them to the controller, and the drug concentration detection device monitors the changes in drug concentration in the blood vessel through a drug concentration sensor or blood analysis technology, and transmits them to the controller.

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