CN113144339B - Infusion monitoring device - Google Patents
Infusion monitoring device Download PDFInfo
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- CN113144339B CN113144339B CN202110396372.0A CN202110396372A CN113144339B CN 113144339 B CN113144339 B CN 113144339B CN 202110396372 A CN202110396372 A CN 202110396372A CN 113144339 B CN113144339 B CN 113144339B
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- drip cup
- sensor
- capacitance sensor
- liquid medicine
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16804—Flow controllers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
- A61M5/1684—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
- A61M5/16886—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body for measuring fluid flow rate, i.e. flowmeters
- A61M5/1689—Drip counters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/18—General characteristics of the apparatus with alarm
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
- A61M2205/3334—Measuring or controlling the flow rate
Abstract
The application discloses an infusion monitoring device and method. The capacitive sensor comprises a first capacitive sensor, a second capacitive sensor, a capacitive-to-digital converter and a processor; the first capacitive sensor and the second capacitive sensor are respectively attached to the surface of the infusion drip cup and are distributed in an up-down arrangement mode; the capacitance-to-digital converter is used for collecting the current capacitance values of the first capacitance sensor and the second capacitance sensor and sending the collected capacitance values to the processor; the processor is used for obtaining the relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the second capacitance sensor according to the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor; and the liquid level height value of the liquid medicine in the infusion drip cup is determined according to the relation. According to the embodiment of the application, the measuring accuracy of the liquid level height value of the liquid medicine in the infusion drip cup is improved.
Description
Technical Field
The application relates to the technical field of medical equipment, in particular to an infusion monitoring device and method.
Background
Intravenous infusion is the most commonly used treatment for clinical medicine, and the absorption of drugs is accelerated by means of blood circulation to achieve a rapid and good medical effect.
However, the intravenous transfusion in hospitals and clinics mainly adopts the traditional transfusion bottle (hanging bag) mode, and the mode is usually weak, easy to coma and easy to fall asleep when patients are transfused, and needs continuous inspection of medical staff to acquire transfusion state information, and special accompanying staff monitors and reports the transfusion state information in real time, so that the workload is large, the working efficiency is low, and a large amount of medical resources and manpower resources are wasted.
At present, an intelligent infusion detection system mainly focuses on modes such as infrared sensing, gravity sensing and capacitance sensor monitoring, and in the process of monitoring an infusion state, as the dielectric constant between the capacitance sensors is influenced by factors such as the dielectric constant of liquid medicine and temperature and humidity, when the dielectric constant between the current capacitance sensors cannot be obtained, the absolute value of the capacitance cannot represent the actual liquid level height, so that it becomes very difficult to obtain the accurate liquid level height by measuring a single capacitance value.
Disclosure of Invention
The embodiment of the application provides an infusion monitoring device and method, which are used for solving the following technical problems in the prior art: because the dielectric constant between the capacitance sensors is affected by a plurality of factors, the accuracy of measuring the liquid level height of the liquid medicine in the drip cup by the infusion monitoring system based on the capacitance sensors is low.
In one aspect, an embodiment of the present application provides an infusion monitoring device, where the monitoring device includes a first capacitive sensor, a second capacitive sensor, a capacitive-to-digital converter, and a processor; the first capacitive sensor and the second capacitive sensor are respectively attached to the surface of the infusion drip cup and are distributed in an up-down arrangement mode; the capacitance-to-digital converter is used for collecting the current capacitance values of the first capacitance sensor and the second capacitance sensor and sending the collected capacitance values to the processor; the processor is used for obtaining the relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the second capacitance sensor according to the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor; and the liquid level height value of the liquid medicine in the infusion drip cup is determined according to the relation.
It can be understood by those skilled in the art that in the embodiment of the present application, the first capacitive sensor and the second capacitive sensor are respectively attached to the surface of the infusion drip cup, and are arranged up and down, and according to the relationship between the liquid level height value of the liquid medicine in the range of the first capacitive sensor surrounding the surface of the infusion drip cup and the liquid level height value of the liquid medicine in the range of the second capacitive sensor surrounding the surface of the infusion drip cup, the liquid level height value of the liquid medicine in the infusion drip cup is determined, so that the influence of the dielectric constant of the liquid medicine on the liquid level height value of the liquid medicine in the measurement infusion drip cup is eliminated, and the measurement accuracy of the liquid level height value of the liquid medicine in the infusion drip cup is improved.
Optionally, the processor obtains a relationship between a liquid level height value of the liquid medicine in a range of the first capacitive sensor surrounding the infusion drip cup surface and a liquid level height value of the liquid medicine in a range of the second capacitive sensor surrounding the infusion drip cup surface according to a current capacitance value of the first capacitive sensor and a current capacitance value of the second capacitive sensor, and specifically includes: the processor compares the capacitance value expression of the first capacitance sensor with the capacitance value expression of the second capacitance sensor to eliminate the dielectric constant of the liquid medicine in the infusion drip cup, and obtain the ratio relation between the liquid level height value of the liquid medicine in the range of the surface of the first capacitance sensor encircling the infusion drip cup and the liquid level height value of the liquid medicine in the range of the surface of the second capacitance sensor encircling the infusion drip cup; wherein the capacitance value expression of the first capacitive sensor is related to a current capacitance value of the first capacitive sensor; the capacitance value expression of the second capacitive sensor is related to the current capacitance value of the second capacitive sensor.
According to the embodiment of the application, the ratio relation between the liquid level height value of the liquid medicine in the surface range of the first capacitance sensor encircling infusion drip kettle and the liquid level height value of the liquid medicine in the surface range of the second capacitance sensor encircling infusion drip kettle is adopted, so that the dielectric constant of the liquid medicine in the infusion drip kettle can be eliminated, and the liquid level height value of the liquid medicine in the infusion drip kettle can be known in real time through the ratio relation.
Optionally, the capacitance value expression of the first capacitive sensor is:
wherein C is 1 Epsilon is the current capacitance value of the first capacitive sensor 0 Is vacuum dielectric constant epsilon r Is the dielectric constant of the liquid medicine in the infusion drip cup, a 1 B is the liquid level height value of the liquid medicine in the range of the first capacitance sensor surrounding the infusion drip cup surface 1 For the width of the electrode plate of the first capacitance sensor, d 1 A diameter distance between electrode plates of the first capacitive sensor;
the capacitance value expression of the second capacitance sensor is:
wherein C is 2 Current capacitance for the second capacitive sensorValue epsilon 0 Is vacuum dielectric constant epsilon r Is the dielectric constant of the liquid medicine in the infusion drip cup; a, a 2 B is the liquid level height value of the liquid medicine in the range of the second capacitance sensor surrounding the infusion drip cup surface 2 For the width of the electrode plate of the second capacitance sensor, d 2 Is the diametrical distance between the electrode plates of the second capacitive sensor.
Optionally, the first capacitive sensor and the second capacitive sensor respectively include a plurality of electrode plates; the electrode plate includes: the measuring electrode plate, a plurality of auxiliary measuring electrode plates, an exciting electrode plate and a plurality of auxiliary exciting electrode plates; wherein, the measuring electrode plate and the exciting electrode plate are relatively distributed on the surface of the infusion drip cup; the auxiliary measuring electrode plates and the auxiliary exciting electrode plates are relatively distributed on the surface of the infusion drip cup; the auxiliary measuring electrode plates are symmetrically arranged on the upper side and the lower side of the measuring electrode plates respectively; the measuring electrode plate is connected with the measuring pin of the corresponding capacitance sensor and is used for measuring the current capacitance value of the corresponding measuring channel; the auxiliary measuring electrode plates are grounded through a grounding pin; the auxiliary excitation electrode plates are symmetrically arranged on the upper side and the lower side of the excitation electrode plates respectively; the excitation electrode plates are connected with the auxiliary excitation electrode plates and the excitation pins of the corresponding capacitance sensors, and are used for receiving excitation signals of the capacitance-to-digital converter so that the measurement electrode plates can measure the current capacitance values of the corresponding measurement channels.
According to the embodiment of the application, the plurality of auxiliary measuring electrode plates are symmetrically arranged on the upper side and the lower side of the measuring electrode plates respectively, the plurality of auxiliary exciting electrode plates are symmetrically arranged on the upper side and the lower side of the exciting electrode plates respectively, influence of surrounding electromagnetic fields on measuring capacitance values can be reduced, and measuring accuracy of each capacitance value is improved.
Optionally, the monitoring device further comprises an electromagnetic shielding module, and the electromagnetic shielding module is made of metal; the electromagnetic shielding module is arranged at the outer side of the infusion drip cup, and the radial distance between the electromagnetic shielding module and the infusion drip cup is larger than a preset threshold value; the electromagnetic shielding module is grounded through a grounding pin.
It can be appreciated by those skilled in the art that, in the embodiment of the present application, the electromagnetic shielding module is disposed on the outer side of the infusion drip cup, so that the influence of the external environment on the measurement capacitance value can be reduced, and the measurement accuracy of each capacitance value is improved.
Optionally, the monitoring device further comprises a capacitor auxiliary installation module, wherein the capacitor auxiliary installation module is in a cylindrical shape and surrounds the outer side of the infusion drip cup; the first capacitive sensor and the second capacitive sensor are respectively arranged on the inner side of the capacitive auxiliary installation module; the electromagnetic shielding module is arranged on the outer side of the capacitor auxiliary installation module.
According to the embodiment of the application, the first capacitance sensor and the first capacitance sensor can be attached to the infusion drip cup through the cylindrical capacitance auxiliary installation module, so that the attachment accuracy of the first capacitance sensor and the first capacitance sensor is improved, the electromagnetic shielding module can encircle the vicinity of the infusion drip cup, and the shielding accuracy of the external environment is improved.
Optionally, the monitoring device further comprises a dripping speed adjusting module, the dripping speed adjusting module comprises a motor and a motor driving element, the motor is connected with the motor driving element, the motor driving element is connected with the processor, and the monitoring device is used for automatically stopping transfusion when the processor detects that the liquid level of the liquid medicine in the transfusion drip cup falls into the range that the preset capacitor surrounds the surface of the transfusion drip cup.
It can be understood by those skilled in the art that the embodiment of the application realizes the function of automatically stopping transfusion by adjusting the dripping speed module, so that the patient relatives or doctors do not need to pay attention to the transfusion condition in real time, and the working efficiency and the medical quality of medical staff are improved.
Optionally, the monitoring device further comprises a gesture detection module, the gesture detection module is connected with the processor, and the gesture detection module is used for obtaining gesture information of the infusion drip cup so that the processor confirms that the infusion drip cup is in a static state.
According to the embodiment of the application, the dropping kettle is confirmed to be in the static state through the gesture detection module, so that the influence of inaccurate measurement on the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor is caused when the infusion dropping kettle shakes, and the measurement accuracy of each capacitance value is improved.
Optionally, after the processor acquires the current capacitance value of the first capacitance sensor, the method further includes: acquiring frequency domain information of a capacitance value of a first capacitance sensor in a preset period; wherein the first capacitance sensor is attached to the upper half part of the surface of the infusion drip cup; the upper half part of the infusion drip cup is close to the liquid inlet pipe; in a preset period, according to the frequency domain information of the capacitance value of the first capacitance sensor and the change of the liquid level height value of the liquid medicine in the infusion drip cup, the processor confirms that the infusion drip cup is in a static state; and determining the dropping speed of the liquid medicine in the infusion drip cup according to the frequency domain information of the capacitance value of the first capacitance sensor.
According to the method and the device, in a preset period, through the change of the frequency domain information of the capacitance value of the first capacitance sensor and the liquid level height value of the liquid medicine in the infusion drip cup, the frequency domain change of the capacitance value of the first capacitance sensor is caused by dripping of the liquid medicine instead of shaking of the infusion drip cup, so that the drip cup is confirmed to be in a static state, invalid frequency domain information can be screened out, then the drip speed of the liquid medicine is determined according to the frequency domain information of the capacitance value of the first capacitance sensor, and the measuring accuracy of the drip speed of the liquid medicine is improved.
On the other hand, the embodiment of the application provides an infusion monitoring method which is applied to an infusion monitoring device, wherein the infusion monitoring device comprises a first capacitance sensor, a second capacitance sensor, a capacitance-to-digital converter and a processor; the first capacitive sensor and the second capacitive sensor are respectively attached to the surface of the infusion drip cup and are distributed in an up-down arrangement mode; the capacitance-to-digital converter is used for collecting the current capacitance values of the first capacitance sensor and the second capacitance sensor and sending the collected capacitance values to the processor; the processor is used for obtaining the relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip kettle surrounded by the second capacitance sensor according to the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor; and the liquid level height value of the liquid medicine in the infusion drip cup is determined according to the relation.
According to the embodiment of the application, the first capacitance sensor and the second capacitance sensor are respectively attached to the surface of the infusion drip cup and are distributed in an up-down arrangement mode, and according to the relation between the liquid level height value of the liquid medicine in the range of the surface of the first capacitance sensor surrounding the infusion drip cup and the liquid level height value of the liquid medicine in the range of the surface of the second capacitance sensor surrounding the infusion drip cup, the liquid level height value of the liquid medicine in the infusion drip cup is determined, so that the influence of the dielectric constant of the liquid medicine on the liquid level height value of the liquid medicine in the infusion drip cup is eliminated, and the measurement accuracy of the liquid level height value of the liquid medicine in the infusion drip cup is improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, some embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a frame of an infusion monitoring device provided in an embodiment of the present application;
FIG. 2 is a schematic structural view of an infusion monitoring device according to an embodiment of the disclosure;
FIG. 3 is a flowchart of an infusion monitoring device according to an embodiment of the present disclosure in an application scenario;
FIG. 4 is a workflow diagram provided in an alternative application scenario in accordance with an embodiment of the present application;
in the figure, an electromagnetic shielding cover 1, a first auxiliary measuring electrode plate 2, a first measuring electrode plate 3, a first auxiliary measuring electrode plate 4, a second auxiliary measuring electrode plate 5, a second measuring electrode plate 6, a second auxiliary measuring electrode plate 7, a second auxiliary exciting electrode plate 8, a second exciting electrode plate 9, a second auxiliary exciting electrode plate 10, a first auxiliary exciting electrode plate 11, a first exciting electrode plate 12, a first auxiliary exciting electrode plate 13 and a transfusion drip cup 14 are arranged.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the technical solutions of the present application will be clearly and completely described below with reference to specific embodiments and corresponding drawings. It will be appreciated by those skilled in the art that the embodiments described in this section detailed description are only some embodiments of the present application and not all embodiments of the present application. All other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, based on the examples described in the detailed description of this section, do not depart from the technical principles of this application and therefore should fall within the scope of the present application.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a frame of an infusion monitoring device according to an embodiment of the disclosure.
As shown in fig. 1, the infusion monitoring device includes a first capacitive sensor 20, a second capacitive sensor 30, a capacitive-to-digital converter 40, and a processor 50.
The first capacitive sensor 20 and the second capacitive sensor 30 are attached to the surface of the infusion drip cup 14 in fig. 2, are arranged up and down, and are respectively connected with the capacitance-to-digital converter 40. The capacitance-to-digital converter 40 is connected to the processor 50, and is configured to collect current capacitance values of the first capacitive sensor 20 and the second capacitive sensor 30, and send the collected capacitance values to the processor 50. The processor 50 processes the current capacitance value of the first capacitance sensor 20 and the current capacitance value of the second capacitance sensor 30 to obtain a liquid level height value of the liquid medicine in the range of the first capacitance sensor 20 surrounding the surface of the infusion drip cup 14 and a liquid level height value of the liquid medicine in the range of the second capacitance sensor 30 surrounding the surface of the infusion drip cup 14, and determines the liquid level height value of the liquid medicine in the infusion drip cup 14 according to the relationship between the liquid level height values.
The installation position of the monitoring device may be set according to actual needs, and is not limited herein. For example, the monitoring device may be suspended from an infusion drip cup or may be clipped to an infusion support.
The plate area of the first capacitive sensor 20 and the plate area of the second capacitive sensor 30 are set according to actual needs, and are not limited herein.
Further, the distance between the first capacitive sensor 20 and the second capacitive sensor 30 may be set according to actual needs, and is not limited herein.
It can be understood by those skilled in the art that in the embodiment of the present application, the first capacitive sensor and the second capacitive sensor are respectively attached to the surface of the infusion drip cup, and are arranged up and down, and according to the relationship between the liquid level height value of the liquid medicine in the range of the first capacitive sensor surrounding the surface of the infusion drip cup and the liquid level height value of the liquid medicine in the range of the second capacitive sensor surrounding the surface of the infusion drip cup, the liquid level height value of the liquid medicine in the infusion drip cup is determined, so that the influence of the dielectric constant of the liquid medicine on the liquid level height value of the liquid medicine in the infusion drip cup is eliminated, and the measurement accuracy of the liquid level height value of the liquid medicine in the infusion drip cup is improved.
In some embodiments of the present application, the first capacitive sensor 20 and the second capacitive sensor 30 each include a plurality of electrode plates, the electrode plates including: the measuring electrode plate, a plurality of auxiliary measuring electrode plates, an exciting electrode plate and a plurality of auxiliary exciting electrode plates.
Wherein, the measuring electrode plate and the exciting electrode plate are relatively distributed on the surface of the infusion drip cup 14, and the auxiliary measuring electrode plates and the auxiliary exciting electrode plates are relatively distributed on the surface of the infusion drip cup 14.
The auxiliary measuring electrode plates are symmetrically arranged on the upper side and the lower side of the measuring electrode plates respectively. The measuring electrode plates are connected with measuring pins of the corresponding capacitance sensors and used for measuring current capacitance values of corresponding measuring channels, and the auxiliary measuring electrode plates are grounded through the grounding pins.
The auxiliary excitation electrode plates are symmetrically arranged on the upper side and the lower side of the excitation electrode plates respectively; the excitation electrode plates and the auxiliary excitation electrode plates are connected with excitation pins of the corresponding capacitance sensors, and are used for receiving excitation signals of the capacitance-to-digital converter 40 so that the measurement electrode plates measure the current capacitance values of the corresponding measurement channels.
The electrode plates and the infusion drip chambers are in a close fit state, relative displacement cannot exist between the electrode plates and the infusion drip chambers, the width and the height of the measuring electrode plates are the same as those of the opposite exciting electrode plates, and the width and the height of the auxiliary measuring electrode plates are the same as those of the opposite auxiliary exciting electrode plates. And the width and the height of each auxiliary measuring electrode plate are the same, and the width and the height of each auxiliary exciting electrode plate are the same.
Further, the width and the height of each electrode plate in the plurality of electrode plates may be set according to actual needs, and are not particularly limited herein.
The measuring channel is used to measure the liquid medicine in the area surrounding the surface of the infusion drip cup 14 by the corresponding capacitance sensor. That is, the measurement channel of the first capacitive sensor 20 means that the first capacitive sensor 20 measures the liquid medicine in a range surrounding the surface of the infusion drip cup 14, and the measurement channel of the second capacitive sensor 30 means that the second capacitive sensor 30 measures the liquid medicine in a range surrounding the surface of the infusion drip cup 14.
For convenience of description, the first capacitive sensor 20 measures the liquid medicine in a range surrounding the surface of the infusion drip cup 14, which is described as a measurement channel of the first capacitive sensor 20, and the second capacitive sensor 30 measures the liquid medicine in a range surrounding the surface of the infusion drip cup 14, which is described as a measurement channel of the second capacitive sensor 30.
It can be understood by those skilled in the art that in the embodiment of the present application, the plurality of auxiliary measuring electrode plates are symmetrically disposed on the upper and lower sides of the measuring electrode plate respectively, and the plurality of auxiliary exciting electrode plates are symmetrically disposed on the upper and lower sides of the exciting electrode plate respectively, so that the influence of the surrounding electromagnetic field on the measured capacitance value can be reduced, and the measurement accuracy of each capacitance value is improved.
In some embodiments of the present application, the processor 50 obtains the current capacitance value of the first capacitive sensor 20 and the current capacitance value of the second capacitive sensor 30 through the capacitive-to-digital converter 40, respectively.
The capacitance-to-digital converter 40 is connected to the measurement pin of the first capacitance sensor 20 and the measurement pin of the second capacitance sensor 30. Further, the capacitance-to-digital converter 40 respectively acquires the current capacitance value of the first capacitive sensor 20 and the current capacitance value of the second capacitive sensor 30 through time-division multiplexing.
For example, the capacitive digitizer 40 captures the current capacitance value of the first capacitive sensor 20 through the measurement pin of the first capacitive sensor 20 at the current time, and the capacitive digitizer 40 captures the current capacitance value of the second capacitive sensor 30 through the measurement pin of the second capacitive sensor 30 at the next time, thereby switching between the two measurement channels.
In some embodiments of the present application, the monitoring device further includes an electromagnetic shielding module, and the electromagnetic shielding module is made of a metal material. And the electromagnetic shielding module is arranged on the outer side of the infusion drip cup 14, and the radial distance between the electromagnetic shielding module and the infusion drip cup 14 is larger than a preset threshold value. The electromagnetic shielding module is grounded through a grounding pin.
The current capacitance value of the capacitor is affected by the external environment, so that the acquired capacitance value is inaccurate. For example, when a person (the human body is a charged body) approaches the hand to the first capacitive sensor 20, a new capacitance is formed between the hand and the electrode plate of the first capacitive sensor 20, resulting in a change in the current capacitance value of the first capacitive sensor 20.
Therefore, according to the embodiment of the application, the electromagnetic shielding module is arranged on the outer side of the infusion drip cup, so that the influence of the external environment on the measured capacitance values can be reduced, and the measurement accuracy of each capacitance value is improved.
The specific metal material of the electromagnetic shielding module may be set according to actual needs, and is not limited herein. For example, the metal material of the electromagnetic shielding module is copper.
Further, the monitoring device further comprises a capacitor auxiliary installation module, wherein the capacitor auxiliary installation module is in a cylindrical shape and surrounds the outer side of the infusion drip cup 14.
Wherein, the first capacitive sensor 20 and the second capacitive sensor 30 are respectively arranged at the inner side of the capacitive auxiliary installation module; the electromagnetic shielding module is arranged on the outer side of the capacitor auxiliary installation module.
It can be appreciated by those skilled in the art that the capacitor auxiliary installation module with cylindrical shape can attach the first capacitive sensor to the infusion drip cup, so that the attaching accuracy of the first capacitive sensor and the first capacitive sensor is improved, the electromagnetic shielding module can encircle the vicinity of the infusion drip cup, and the shielding accuracy of the external environment is improved.
In some embodiments of the present application, the monitoring device further includes an alarm module that is triggered to sound and light when the processor 50 detects that the medical fluid in the drip chamber 14 begins to descend.
The specific mode of the alarm can be set according to actual needs, and is not limited herein. For example, the alarm mode may sound a buzzer or flash an LED.
Those skilled in the art can understand that the embodiment of the application can enable the patient relatives or doctors to pay attention to the transfusion condition in real time through the alarm module, and only has two working flows of injection and needle pulling, so that the working efficiency of medical staff is improved.
In some embodiments of the present application, the monitoring device further comprises a drip speed adjusting module, wherein the drip speed adjusting module comprises a motor and a motor driving element, the motor is connected with the motor driving element, and the motor driving element is connected with the processor 50 and is used for automatically stopping infusion when the processor 50 detects that the liquid level of the liquid medicine in the infusion drip cup 14 falls into the range of the preset capacitor surrounding the surface of the infusion drip cup.
Wherein the preset capacitance is attached to the lower half of the surface of the drip cup 14 and the lower half of the drip cup 14 is close to the drain pipe.
Further, since different medicaments have different pharmacological properties, reasonable dripping speed setting can be performed according to the age and physical state of a patient by adjusting the dripping speed module.
It can be appreciated by those skilled in the art that the embodiment of the application realizes the functions of automatically stopping transfusion and adjusting the transfusion speed by adjusting the transfusion speed module, reduces the danger caused when the transfusion state of a patient cannot be checked in time, further enables the patient relatives or doctors not to pay attention to the transfusion condition in real time, and can improve the working efficiency and the medical quality of medical staff.
In addition, the monitoring device further comprises a gesture detection module, the gesture detection module is connected with the processor 50, and the gesture detection module is used for obtaining gesture information of the infusion drip cup 14 so that the processor 50 confirms that the infusion drip cup is in a static state.
Further, the gesture detection module obtains gesture information of the infusion drip cup in real time through the sensor, determines whether the infusion drip cup is in a static state through a detection algorithm, and outputs a gesture change state to the processor 50 in real time, so that the processor 50 processes a capacitance value acquired when the infusion drip cup is in the static state.
The specific model of the sensor and the detection algorithm may be set according to actual needs, and are not limited herein. For example, the gesture detection module obtains gesture information of the infusion drip cup in real time through the IMU sensor, and determines whether the infusion drip cup is in a static state through a generalized likelihood ratio detection algorithm.
As can be appreciated by those skilled in the art, the gesture detection module determines whether the capacitance value data acquired by the capacitance-to-digital converter 40 is reliable, so that the influence of inaccurate measurement on the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor caused by shaking of the infusion drip cup is eliminated, and the measurement accuracy of measuring the liquid level height value of the liquid medicine in the infusion drip cup 14 is improved to a certain extent.
More intuitively, embodiments of the present application provide a schematic structural diagram of an infusion monitoring device, as shown in fig. 2.
The structure in fig. 2 includes: the electromagnetic shielding cover 1, the first auxiliary measuring electrode plate 2, the first measuring electrode plate 3, the first auxiliary measuring electrode plate 4, the second auxiliary measuring electrode plate 5, the second measuring electrode plate 6, the second auxiliary measuring electrode plate 7, the second auxiliary exciting electrode plate 8, the second exciting electrode plate 9, the second auxiliary exciting electrode plate 10, the first auxiliary exciting electrode plate 11, the first exciting electrode plate 12, the first auxiliary exciting electrode plate 13 and the infusion drip cup 14.
Specifically, the first capacitive sensor 20 is attached to the upper half of the surface of the drip chamber 14, wherein the upper half of the drip chamber 14 is adjacent to the inlet tube.
The first capacitive sensor 20 includes a first auxiliary measuring electrode plate 2, a first measuring electrode plate 3, a first auxiliary measuring electrode plate 4, a first auxiliary exciting electrode plate 11, a first exciting electrode plate 12, and a first auxiliary exciting electrode plate 13.
Further, the first measuring electrode plate 3 and the first exciting electrode plate 12 are relatively distributed on the surface of the infusion drip cup 14, the first auxiliary measuring electrode plate 2 and the first auxiliary exciting electrode plate 13 are relatively distributed on the surface of the infusion drip cup 14, and the first auxiliary measuring electrode plate 4 and the first auxiliary exciting electrode plate 11 are relatively distributed on the surface of the infusion drip cup 14.
Further, the first auxiliary measuring electrode plate 2 and the first auxiliary measuring electrode plate 4 are symmetrically disposed on the upper and lower sides of the first measuring electrode plate 3, respectively.
The first measuring electrode plate 3 is connected to a measuring pin of the first capacitive sensor 20, and is used for measuring a current capacitance value of a measuring channel of the first capacitive sensor 20, and the first auxiliary measuring electrode plate 2 and the first auxiliary measuring electrode plate 4 are grounded through a grounding pin.
Further, the first auxiliary exciting electrode plate 11 and the first auxiliary measuring electrode plate 13 are symmetrically disposed on the upper and lower sides of the first exciting electrode plate 12, respectively.
The first excitation electrode plate 12, the first auxiliary excitation electrode plate 11, and the first auxiliary excitation electrode plate 13 are connected to an excitation pin of the first capacitive sensor 20, and are configured to receive an excitation signal of the capacitive-to-digital converter 40, so that the first measurement electrode plate 3 measures a current capacitance value of a measurement channel of the first capacitive sensor 20.
Specifically, the second capacitive sensor 30 is attached to the lower half of the surface of the drip chamber 14, wherein the lower half of the drip chamber 14 is adjacent to the outlet conduit.
The second capacitive sensor 30 includes a second auxiliary measuring electrode plate 5, a second measuring electrode plate 6, a second auxiliary measuring electrode plate 7, a second auxiliary exciting electrode plate 8, a second exciting electrode plate 9, and a second auxiliary exciting electrode plate 10.
Further, the second measuring electrode plate 6 and the second excitation electrode plate 9 are relatively distributed on the surface of the infusion drip cup 14, the second auxiliary measuring electrode plate 5 and the second auxiliary excitation electrode plate 10 are relatively distributed on the surface of the infusion drip cup 14, and the second auxiliary measuring electrode plate 7 and the second auxiliary excitation electrode plate 8 are relatively distributed on the surface of the infusion drip cup 14.
Further, the second auxiliary measuring electrode plate 5 and the second auxiliary measuring electrode plate 7 are symmetrically disposed on the upper and lower sides of the second measuring electrode plate 6, respectively.
The second measuring electrode plate 6 is connected to a measuring pin of the second capacitive sensor 30, and is used for measuring a current capacitance value in a measuring channel of the second capacitive sensor 30, and the second auxiliary measuring electrode plate 5 and the second auxiliary measuring electrode plate 7 are grounded through a grounding pin.
Further, the second auxiliary exciting electrode plate 8 and the second auxiliary measuring electrode plate 10 are symmetrically arranged on the upper and lower sides of the second exciting electrode plate 9, respectively.
The second excitation electrode plate 9, the second auxiliary excitation electrode plate 8, and the second auxiliary excitation electrode plate 10 are connected to excitation pins of the second capacitive sensor 30, and are configured to receive an excitation signal of the capacitive-to-digital converter 40, so that the second measurement electrode plate 6 measures a current capacitance value of a measurement channel of the second capacitive sensor 30.
In some embodiments of the present application, the bottom edge of the second auxiliary measuring electrode plate 7, the second auxiliary excitation electrode plate 8, is more than 10mm from the bottom edge of the infusion drip cup 14. The distance between the top edge of the first auxiliary measuring electrode plate 2 and the top edge of the first auxiliary exciting electrode plate 13 and the top of the infusion drip cup 14 is more than 10mm.
Further, the widths of the electrode plates are between 6 and 8mm, the heights of the first auxiliary measuring electrode plate and the second auxiliary measuring electrode plate are between 1 and 2mm, the height of the second measuring electrode plate 6 is between 6 and 10mm, and the height of the first measuring electrode plate 3 is between 15 and 25 mm.
Further, the radial distance between the electromagnetic shielding cover 1 and the plurality of electrode plates is more than 2.5mm.
Further, according to the above description, the embodiment of the present application provides a workflow diagram of the infusion monitoring device in an application scenario, as shown in fig. 3, and specifically implemented, for example, by the structure in fig. 2.
The flow in fig. 3 includes the following steps:
s301, acquiring a current capacitance value of the second capacitance sensor.
Specifically, first, the capacitance-to-digital converter 40 applies excitation signals to the second auxiliary excitation electrode plate 8, the second excitation electrode plate 9, and the second auxiliary excitation electrode plate 10 through the excitation pins of the second capacitance sensor 30, and then obtains the current capacitance value of the measurement channel of the second capacitance sensor 30 through the capacitance-to-digital converter 40 based on the second measurement electrode plate 6 connected to the measurement pins of the second capacitance sensor 30.
Wherein the second capacitive sensor 30 is attached to the lower half of the surface of the drip cup 14, the lower half of the drip cup 14 being adjacent to the outlet pipe.
S302, acquiring a current capacitance value of the first capacitance sensor.
Specifically, the capacitive-to-digital converter 40 turns off the excitation and measurement of the second capacitive sensor 30, applies excitation signals to the first excitation electrode plate 12, the first auxiliary excitation electrode plate 11, and the first auxiliary excitation electrode plate 13 through the excitation pins of the first capacitive sensor 20, and then obtains the current capacitance value of the measurement channel of the first capacitive sensor 20 through the capacitive-to-digital converter 40 based on the first measurement electrode plate 3 connected to the measurement pins of the first capacitive sensor 20.
Wherein the first capacitive sensor 20 is attached to the upper half of the surface of the drip cup 14, the upper half of the drip cup 14 being adjacent to the inlet tube.
S303, comparing the capacitance value expression of the first capacitance sensor with the capacitance value expression of the second capacitance sensor, and obtaining the ratio relation between the liquid level height value of the liquid medicine in the range of the first capacitance sensor encircling the surface of the infusion drip cup and the liquid level height value of the liquid medicine in the range of the second capacitance sensor encircling the surface of the infusion drip cup.
Wherein the capacitance value expression of the first capacitive sensor 20 is related to the current capacitance value of the first capacitive sensor 20; the capacitance value expression of the second capacitive sensor 30 relates to the current capacitance value of the second capacitive sensor 30.
Specifically, the capacitance value expression of the first capacitance sensor 20 is:
wherein C is 1 Epsilon is the current capacitance value of the first capacitive sensor 20 0 Is vacuum dielectric constant epsilon r Is the dielectric constant, a, of the liquid medicine in the infusion drip cup 14 1 Is the liquid level height value b of the liquid medicine in the range of the surface of the first capacitance sensor 20 surrounding the infusion drip cup 14 1 Is the width, d, of the electrode plate of the first capacitive sensor 20 1 Is the diametrical distance between the electrode plates of the first capacitive sensor 20.
Further, the capacitance value expression of the second capacitance sensor 30 is:
wherein C is 2 Epsilon is the current capacitance value of the second capacitive sensor 30 0 Is vacuum dielectric constant epsilon r Is the dielectric constant of the liquid medicine in the infusion drip cup 14; a, a 2 Is the liquid level height value b of the liquid medicine in the range of the surface of the infusion drip cup 14 surrounded by the second capacitance sensor 30 2 Width d of electrode plate of second capacitance sensor 30 2 Is the diametrical distance between the electrode plates of the second capacitive sensor 30.
Still further, the ratio relationship between the liquid level value of the liquid medicine in the range where the first capacitive sensor 20 surrounds the surface of the infusion drip cup 14 and the liquid level value of the liquid medicine in the range where the second capacitive sensor 30 surrounds the surface of the infusion drip cup 14 is:
s304, determining the liquid level height value of the liquid medicine in the infusion drip cup according to the ratio relation.
Specifically, the processor 50 obtains a liquid level value of the liquid medicine within a range where the first capacitive sensor 20 surrounds the surface of the infusion drip cup 14 according to the ratio relation.
Wherein, the liquid level height value of the liquid medicine in the range of the surface of the first capacitance sensor 20 surrounding the infusion drip cup 14 is as follows:
further, pair a 1 、a 2 The distance between the first capacitance sensor 20 and the second capacitance sensor 30, and the distance between the bottom edge of the second capacitance sensor 30 and the bottom of the infusion drip cup 14 are added to obtain the liquid level height value of the liquid medicine in the infusion drip cup.
It should be noted that, in the initial stage of infusion, the level of the liquid medicine in the infusion drip cup 14 is higher than the measurement channel of the second capacitance sensor 30, so that the level of the liquid medicine in the area where the second capacitance sensor 30 surrounds the surface of the infusion drip cup 14 is the total height of the electrode plates of the second capacitance sensor 30. That is, a 2 The values of (2) are known.
Further, when the liquid level value of the liquid medicine in the infusion drip cup 14 falls to the second capacitance sensor 30, the liquid level value of the liquid medicine in the first capacitance sensor 20 is 0, the current capacitance value of the first capacitance sensor 20 is close to 0, and the processor 50 can automatically stop infusion.
In addition, if the liquid level of the liquid medicine in the infusion drip cup 14 is lower than the measurement channel of the second capacitance sensor 30 during the initial stage of the infusion due to the misoperation, the liquid level of the liquid medicine in the first capacitance sensor 20 is 0, the current capacitance value of the first capacitance sensor 20 is close to 0, and the processor 50 automatically cuts off the infusion.
That is, the embodiment of the present application uses the measurement channel of the second capacitive sensor 30 as the reference measurement channel, so as to monitor the infusion state more timely.
Here, although the present embodiment is described with reference to fig. 3 for S301 to S304 to be sequentially described, this does not mean that S301 to S304 must be performed in strict order. The steps S301 to S304 are sequentially described in the order shown in fig. 3 in this embodiment, so as to facilitate understanding of the technical solution of this embodiment by those skilled in the art. In other words, in the present embodiment, the sequence between steps S301 to S304 may be appropriately adjusted according to the actual needs.
As can be appreciated by those skilled in the art, since the dielectric constant is affected by a plurality of factors, the capacitance value expression of the first capacitance sensor is compared with the capacitance value expression of the second capacitance sensor by the processor, so that the ratio relationship between the liquid level height value of the liquid medicine in the range of the surface of the first capacitance sensor surrounding the infusion drip kettle and the liquid level height value of the liquid medicine in the range of the surface of the second capacitance sensor surrounding the infusion drip kettle is obtained, thereby eliminating the dielectric constant of the liquid medicine in the infusion drip kettle, and knowing the liquid level height value of the liquid medicine in the infusion drip kettle in real time through the ratio relationship.
In some embodiments of the present application, such as specifically applied to the flow chart of fig. 3, the processor 50 determines the level of the liquid medicine in the infusion drip chamber, and may include the steps of:
The processor 50 obtains the current capacitance value of the second capacitive sensor 30 due to a 2 If the value of (2) is known, the processor 50 can calculate the dielectric constant of the liquid medicine in the infusion drip chamber 14 by the capacitance value expression of the second capacitance sensor 30.
The processor 50 then obtains the level height of the liquid medicine within the range of the surface of the first capacitive sensor 20 surrounding the infusion drip cup 14 by obtaining the current capacitance value of the first capacitive sensor 20, based on the calculated dielectric constant of the liquid medicine in the infusion drip cup 14, and substituting the dielectric constant into the capacitance value expression of the first capacitive sensor 20.
Finally, the processor 50 sets the first capacitance sensor 20 to the level value, a, of the liquid medicine within the range surrounding the surface of the infusion drip cup 14 2 Is a value of (a) a first capacitive sensor20, the distance between the second capacitance sensor 30 and the bottom edge of the second capacitance sensor 30 and the bottom of the infusion drip cup 14 are added together, so that the liquid level height value of the liquid medicine in the infusion drip cup 14 can be calculated.
As will be appreciated by those skilled in the art, since the level of the liquid medicine in the infusion drip cup is affected by a variety of factors and has uncertainty, the embodiment of the present application can reversely infer the dielectric constant of the liquid medicine in the infusion drip cup in the current environment by the second capacitance sensor, and the dielectric constant will be used to calculate the level of the liquid medicine in the measurement channel of the first capacitance sensor.
The embodiment of the application also provides another workflow diagram in another application scene, as shown in fig. 4, and specifically implemented by the structure in fig. 2.
The flow in fig. 4 includes the steps of:
s401, firstly, acquiring frequency domain information of a capacitance value of the first capacitive sensor 20 in a preset period.
Specifically, after the processor 50 obtains the current capacitance value of the first capacitive sensor 20, in a preset period, the processor 50 first increases the sampling rate of the current capacitance value of the first capacitive sensor 20, then continuously samples the first capacitive sensor 20 to obtain a set of capacitance values in continuous time, and performs fourier transform on the capacitance values to obtain the characteristic that the capacitance values change in the frequency domain, so as to obtain the frequency domain information of the capacitance values of the first capacitive sensor 20.
Wherein the first capacitive sensor 20 is attached to the upper half of the surface of the infusion drip chamber 14; the upper half of the infusion drip cup 14 is adjacent to the inlet tube.
S402, in a preset period, according to the frequency domain information of the capacitance value of the first capacitance sensor and the change of the liquid level height value of the liquid medicine in the infusion drip cup, the processor confirms that the infusion drip cup is in a static state.
If the frequency domain information of the capacitance value of the first capacitance sensor 20 is caused by shaking of the infusion drip cup 14, the level height value of the liquid medicine in the infusion drip cup 14 is not changed basically, that is, the frequency domain information of the first capacitance sensor 20 is compared with the change value of the level height value of the liquid medicine in the infusion drip cup 14, so that the infusion drip cup is determined to be in a static state.
S403, determining the dropping speed of the liquid medicine in the infusion drip cup according to the frequency domain information of the capacitance value of the first capacitance sensor.
Specifically, the processor 50 performs a feature analysis calculation on the frequency domain information of the capacitance value of the effective first capacitance sensor 20, so as to obtain the dripping speed of the liquid medicine in the infusion drip cup 14.
Further, the infusion time can be determined according to the dropping speed of the liquid medicine in the infusion drip cup 14 and the total amount of the liquid medicine.
It can be appreciated by those skilled in the art that in the preset period, according to the frequency domain information of the capacitance value of the first capacitance sensor and the change of the liquid level height value of the liquid medicine in the infusion drip cup, it can be known that the frequency domain change of the capacitance value of the first capacitance sensor is caused by the dripping of the liquid medicine, but not caused by the shaking of the infusion drip cup, so that the drip cup is confirmed to be in a static state, invalid frequency domain information can be screened out, then the dripping speed of the liquid medicine is determined according to the frequency domain information of the capacitance value of the effective first capacitance sensor, and the measuring accuracy of the dripping speed of the liquid medicine is improved.
Further, by determining the infusion time, the time control of doctors and patients can be more convenient.
In some embodiments of the present application, there is further provided an infusion monitoring method applied to the infusion monitoring device, where the monitoring device includes a first capacitive sensor 20, a second capacitive sensor 30, a capacitive-to-digital converter 40, and a processor 50; the first capacitive sensor 20 and the second capacitive sensor 30 are respectively attached to the surface of the infusion drip cup 14 and are distributed in an up-down arrangement; the capacitance-to-digital converter 40 is configured to collect current capacitance values of the first capacitive sensor 20 and the second capacitive sensor 30, and send the collected capacitance values to the processor 50; the processor 50 is configured to obtain a relationship between a liquid level height value of the liquid medicine in a range where the first capacitive sensor 20 surrounds the surface of the infusion drip cup 14 and a liquid level height value of the liquid medicine in a range where the second capacitive sensor 30 surrounds the surface of the infusion drip cup 14 according to a current capacitance value of the first capacitive sensor 20 and a current capacitance value of the second capacitive sensor 30; and for determining the level height of the liquid medicine in the infusion drip chamber 14 based on the relationship.
All embodiments in the application are described in a progressive manner, and identical and similar parts of all embodiments are mutually referred, so that each embodiment mainly describes differences from other embodiments.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical principles of the present application should fall within the protection scope of the present application.
Claims (1)
1. An infusion monitoring device is characterized by comprising a first capacitance sensor, a second capacitance sensor, a capacitance-to-digital converter and a processor;
the first capacitance sensor and the second capacitance sensor are respectively attached to the surface of the infusion drip cup and are distributed in an up-down arrangement mode;
the capacitance-to-digital converter is used for collecting the current capacitance values of the first capacitance sensor and the second capacitance sensor and sending the collected capacitance values to the processor;
the processor is used for obtaining the relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the second capacitance sensor according to the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor; and the liquid level height value of the liquid medicine in the infusion drip cup is determined according to the relation;
the processor obtains the relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the second capacitance sensor according to the current capacitance value of the first capacitance sensor and the current capacitance value of the second capacitance sensor, and specifically comprises the following steps:
The processor compares the capacitance value expression of the first capacitance sensor with the capacitance value expression of the second capacitance sensor to eliminate the dielectric constant of the liquid medicine in the infusion drip cup, and obtain the ratio relation between the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the first capacitance sensor and the liquid level height value of the liquid medicine in the range of the surface of the infusion drip cup surrounded by the second capacitance sensor;
wherein the capacitance value expression of the first capacitive sensor is related to a current capacitance value of the first capacitive sensor; the capacitance value expression of the second capacitance sensor is related to the current capacitance value of the second capacitance sensor;
the ratio relation between the liquid level height value of the liquid medicine in the range of the surface of the first capacitance sensor encircling infusion drip cup and the liquid level height value of the liquid medicine in the range of the surface of the second capacitance sensor encircling infusion drip cup is as follows:the C is 1 C is the current capacitance value of the first capacitive sensor 2 For the current capacitance value of the second capacitive sensor, said a 1 A is the liquid level height value of the liquid medicine in the range of the first capacitance sensor surrounding the infusion drip kettle surface, and a is 2 For the second electricityThe liquid level height value of the liquid medicine in the range surrounding the infusion drip cup surface of the volume sensor;
according to the relation, determining the liquid level height value of the liquid medicine in the infusion drip cup specifically comprises the following steps:
according to the relation, determining a liquid level height value of the liquid medicine in a range of the first capacitance sensor surrounding the surface of the infusion drip cup;
if said a 1 The method comprises the steps that when the liquid level height value of liquid medicine in the range of the surface of a first capacitance sensor surrounding an infusion drip cup, the liquid level height value of the liquid medicine in the range of the surface of a second capacitance sensor surrounding the infusion drip cup, the distance between the first capacitance sensor and the second capacitance sensor, and the distance between the bottom edge of the second capacitance sensor and the bottom of the infusion drip cup are added, so that the liquid level height value of the liquid medicine in the infusion drip cup is obtained;
the first capacitance sensor and the second capacitance sensor respectively comprise a plurality of electrode plates; the electrode plate includes: the measuring electrode plate, a plurality of auxiliary measuring electrode plates, an exciting electrode plate and a plurality of auxiliary exciting electrode plates; wherein the measuring electrode plate and the exciting electrode plate are relatively distributed on the surface of the infusion drip cup; the auxiliary measuring electrode plates and the auxiliary exciting electrode plates are distributed on the surface of the infusion drip cup relatively;
The auxiliary measuring electrode plates are symmetrically arranged on the upper side and the lower side of the measuring electrode plates respectively;
the measuring electrode plates are connected with the corresponding measuring pins of the capacitance sensor and are used for measuring the current capacitance value of the corresponding measuring channel; the auxiliary measuring electrode plates are grounded through a grounding pin;
the auxiliary excitation electrode plates are symmetrically arranged on the upper side and the lower side of the excitation electrode plates respectively;
the excitation electrode plates are connected with the auxiliary excitation electrode plates and the excitation pins of the corresponding capacitance sensors, and are used for receiving excitation signals of the capacitance-to-digital converters so that the measurement electrode plates can measure the current capacitance values of the corresponding measurement channels;
after the processor obtains the current capacitance value of the first capacitance sensor, the method further comprises:
acquiring frequency domain information of a capacitance value of the first capacitance sensor in a preset period; wherein the first capacitance sensor is attached to the upper half part of the surface of the infusion drip cup; the upper half part of the infusion drip cup is close to the liquid inlet pipe;
in the preset period, according to the frequency domain information of the capacitance value of the first capacitance sensor and the change of the liquid level height value of the liquid medicine in the infusion drip cup, the processor confirms that the infusion drip cup is in a static state;
Determining the dropping speed of the liquid medicine in the infusion dropping kettle according to the frequency domain information of the capacitance value of the first capacitance sensor;
the capacitance value expression of the first capacitance sensor is:
wherein C is 1 Epsilon is the current capacitance value of the first capacitive sensor 0 Is vacuum dielectric constant epsilon r Is the dielectric constant of the liquid medicine in the infusion drip cup, a 1 B, the liquid level height value of the liquid medicine in the range surrounding the surface of the infusion drip cup of the first capacitance sensor 1 D is the width of the electrode plate of the first capacitance sensor 1 A diameter distance between electrode plates of the first capacitive sensor;
the capacitance value expression of the second capacitance sensor is:
wherein C is 2 Epsilon is the current capacitance value of the second capacitive sensor 0 Is the vacuum dielectric constant, epsilon r Is the dielectric constant of the liquid medicine in the infusion drip cup; a, a 2 To be the instituteThe liquid level height value, b, of the liquid medicine in the range surrounding the surface of the infusion drip cup of the second capacitance sensor 2 D is the width of the electrode plate of the second capacitance sensor 2 A diameter distance between electrode plates of the second capacitive sensor;
the monitoring device also comprises an electromagnetic shielding module, wherein the electromagnetic shielding module is made of metal materials; the electromagnetic shielding module is arranged on the outer side of the infusion drip cup, and the radial distance between the electromagnetic shielding module and the infusion drip cup is larger than a preset threshold value;
The electromagnetic shielding module is grounded through a grounding pin;
the monitoring device also comprises a capacitor auxiliary installation module, wherein the capacitor auxiliary installation module is in a cylindrical shape and surrounds the outer side of the infusion drip cup;
the first capacitive sensor and the second capacitive sensor are respectively arranged on the inner side of the capacitive auxiliary installation module; the electromagnetic shielding module is arranged on the outer side of the capacitor auxiliary installation module;
the monitoring device further comprises a dripping speed adjusting module, wherein the dripping speed adjusting module comprises a motor and a motor driving element, the motor is connected with the motor driving element, and the motor driving element is connected with the processor and is used for automatically stopping transfusion when the processor detects that the liquid level of the liquid medicine in the transfusion drip cup falls into the range that the preset capacitor surrounds the surface of the transfusion drip cup;
the monitoring device further comprises a gesture detection module, wherein the gesture detection module is connected with the processor and is used for acquiring gesture information of the infusion drip cup so that the processor confirms that the infusion drip cup is in a static state.
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