CN115531661B - Anti-interference intravenous infusion flow velocity measurement method, device and system - Google Patents
Anti-interference intravenous infusion flow velocity measurement method, device and system Download PDFInfo
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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
- A61M5/16831—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
- A61M5/16845—Monitoring, detecting, signalling or eliminating infusion flow anomalies by detecting the amount of infusate remaining, e.g. signalling end of infusion by weight
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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
- A61M5/16895—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 by monitoring weight change, e.g. of infusion container
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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
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Abstract
The invention provides an anti-interference intravenous transfusion flow rate measuring method, device and system, wherein the anti-interference intravenous transfusion flow rate measuring system comprises a weighing sensor C1, a weighing sensor C2, two signal processing circuits, a signal reprocessing circuit and an MCU. The measuring device comprises an infusion support, a liquid bottle or a liquid bag, a liquid bottle and liquid bag protection frame, an infusion pipeline and a flow rate measuring device. The infusion system stability can be monitored in real time, the stability states can be identified in a grading mode, and different means can be adopted for different stability states. Transmitting the data in the stable state to a storage display device; performing error correction on unsteady state data in an acceptable range to obtain an accurate flow value, and transmitting the accurate flow value to a storage display device; an unacceptable unsteady state is alerted.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to an anti-interference intravenous transfusion flow velocity measuring method, device and system.
Background
Intravenous infusion is a popular therapy that can effectively deliver liquid substances directly to a patient by intravenous administration. Intravenous infusion treatment is usually carried out through an infusion tube, the problems of empty dropping, needle blocking and the like can occur during infusion, and a certain danger can be caused to a patient, so that nursing staff or family members are required to carry out manual monitoring, and a large amount of labor cost is consumed. To solve the above problems, the prior art monitors the infusion process by an automated system, wherein the device detecting the drip rate typically estimates the rate by checking the drip rate of the liquid in the murphy's tube, actively controlling the drip rate by peristaltic pumps, or calculating the liquid medicine rate by weighing the change in calculated weight.
For example, in chinese patent application publication No. CN 108815615A and application publication No. 2018.11.16, a system and a method for controlling a flow rate of a medical infusion device are disclosed, including: the device comprises a first measuring module, a conversion module, a processing module, a timing module and a control module, wherein the processing module is respectively connected with the first measuring module, the conversion module and the timing module, the processing module comprises a calculation module, the conversion module is used for converting weight data of an infusion bottle into other physical quantities, the first measuring module is used for measuring the other physical quantities converted by the weight of the infusion bottle, the processing module is used for determining calculation points according to numerical intervals of the physical quantities and numerical values of current physical quantities, the timing module is used for timing numerical intervals of the physical quantities, the calculation module is used for calculating change speeds of the physical quantities according to timing results of the timing module and the numerical intervals, the processing module integrates flow rates of liquid medicine in an infusion tube according to the change speeds of the physical quantities, and the control module is used for adjusting actual flow rates of the liquid medicine in the infusion tube according to the flow rates of the liquid medicine.
Because the intravenous infusion is usually carried out by hanging an infusion bottle or an infusion bag on an infusion support, the infusion bottle, the infusion bag and an infusion tube can shake due to the influence of the surrounding environment or the movement of a patient, so that the stability and the accuracy of the automatic monitoring system on the measurement of the infusion flow rate are affected, and the normal monitoring on the infusion process is affected. The prior art cannot monitor the stability of the infusion system in real time and correct errors of unsteady state data to obtain accurate flow values.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides an anti-interference intravenous transfusion flow rate measuring method and system, which can monitor the stability of a transfusion system in real time, conduct grading identification on the stable state, conduct error correction on unsteady state data in an acceptable range to obtain an accurate flow value, and alarm unacceptable unsteady state.
In order to achieve the above purpose, the present invention provides the following technical solutions: an anti-interference intravenous transfusion flow rate measuring method comprises the following steps:
s1, acquiring initial data; common initial weight m of liquid bottle or liquid bag and infusion pipeline measured by weighing sensor C1 0(0) The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the initial weight m of the whole infusion device which is measured by the weighing sensor C2 and comprises a liquid bottle or a liquid bag, an infusion pipeline and a bracket Total (0) Initial bracket weight m Support (0) ＝m Total (0) -m 0(0) ；
Since the infusion set is in a steady state at this time, the initial stent weight mstart obtained at this time can represent the true weight of the stent.
S2, acquiring real-time weighing weights of the weighing sensor C1 and the weighing sensor C2 according to a preset weighing acquisition time interval delta t, and calculating real-time bracket weight m Support (t) The method comprises the steps of carrying out a first treatment on the surface of the The weighing weights at times t C1 and C2 are m respectively 0(t) 、m Total (t) ；
m Support (t) ＝m Total (t) -m 0(t)；
S3, the initial weight m of the bracket weight Support (t) And a bracket m Support (0) In contrast, if the rate of change of the difference between the twoIf the concentration is not more than 1%, the infusion device is considered to be in a stable state, the change of delta t time C1 or C2 and the flow rate is +.>Or->Transmitting the flow value to a memory display device, preferably +.>
the weighing weights of the weighing sensor C1 and the weighing sensor C2 at the time t+delta t are respectively m 0(t+Δt) 、m Total (t+Deltat) ；
S4, if the change rate of the difference value of the twoIf the ratio is more than 1% and less than 10%, the infusion device is considered to be in an unstable and acceptable state, and at the moment, shaking occurs but the actual flow is not affected, so that the measured values of C1 and C2 are required to be corrected.
S5, if the preset time of nDeltat is reached, the change rate of the difference value of the twoGreater than 25%, the infusion device is deemed to be in an unstable unacceptable state, at which point an alarm should be raised. The preset time nDeltat is 0.1-5 s.
The invention is further provided with: in step S3, the weight of the liquid medicine reduced by the infusion device, namely delta m, is calculated from the time t to the time t+delta t through the change of the C1 measured value Medicine liquid (C1) ＝m 0(t+Δt) -m 0(t) The method comprises the steps of carrying out a first treatment on the surface of the The reduced medicine liquid weight of the transfusion device, namely delta m, is calculated by the change of the C2 measured value Medicine liquid (C2) ＝m Total (t+Deltat) -m Total (t) ；
If the infusion device including the infusion support, the liquid bottle or the liquid bag, the liquid bottle and liquid bag protection frame and the infusion pipeline is stable within the period from the time t to the time t+delta t, the calculated reduced liquid medicine weight delta m Liquid medicine (C1) Δm Medicine liquid (C2) Equal.
The invention is further provided with: in step S4, the correction of the measured values of C1 and C2 is specifically:
introducing an influence factor delta, wherein the influence factor delta is the ratio of the difference value between the measured weight and the actual weight to the actual weight,
calculating the influencing factor at time t by the weight of the bracket, i.e
So that the influence factor delta can be used t Calculating the corresponding actual weight of the weight according to other measured weights at the time t; i.e.
Thus, for C1 and C2, the resulting m is measured 0(t) 、m Total (t) 、m 0(t+Δt) 、m Total (t+Deltat) The corresponding actual weights are respectively
Then, at this time, from the time t to the time t+Δt, the actual reduced liquid medicine is calculated by the C1 measurement value to be
The calculation by C2 measurement should be
The invention is further provided with: if the preset time of nDeltat, deltam Medicine liquid (C1) Or Deltam Medicine liquid (C2) The value of (2) is 0, and the amount of the liquid medicine is not changed, and the transfusion is finished or stopped, and an alarm is sent out. Where n is an integer and nΔt represents n acquisition time intervals.
An anti-interference intravenous transfusion flow rate measuring device comprises a transfusion bracket, a liquid bottle or a liquid bag, a liquid bottle and liquid bag protection frame, a transfusion pipeline and a flow rate measuring device; the flow rate measuring device at least comprises a weighing sensor C1 and a weighing sensor C2; a liquid bottle and liquid bag protection frame is arranged on the transfusion support;
the weighing sensor C1 is hung at the top of the liquid bottle or the liquid bag and is used for measuring the weight of the infusion pipeline and the liquid bottle or the liquid bag;
the weighing sensor C2 is positioned at the bottom of the anti-interference intravenous transfusion flow velocity device and is used for measuring the whole weight of the device.
The invention also provides an anti-interference intravenous transfusion flow velocity measurement system which comprises two weighing sensors, two signal processing circuits, a signal reprocessing circuit and an MCU;
the weighing sensors are respectively connected with the signal processing circuits, the two signal processing circuits are connected with the signal reprocessing circuits, and the signal reprocessing circuits transmit signals to the MCU;
the invention is further provided with: the MCU comprises a storage module, a signal sampling module, a judging module, a calculating module, a clock signal module and a signal driving module, wherein the clock signal module is provided by an external clock source circuit; the signal reprocessing circuit transmits the signal to a signal sampling module in the MCU.
The invention is further provided with: the anti-interference intravenous transfusion flow rate measurement system further comprises a display alarm device, wherein the display alarm device comprises a power driving unit, a display unit and a sound unit, the signal driving module is connected with the power driving unit, and the power driving unit is connected with the display unit and the sound unit.
In summary, the technical scheme of the invention has the following beneficial effects:
1. the anti-interference intravenous transfusion flow rate measuring method and system can monitor the stability of the transfusion system in real time, identify the stable state in a grading way, divide the stable state into a stable state, an unstable acceptable state and an unstable unacceptable state, and adopt different means for different stable states.
2. The invention provides an anti-interference intravenous transfusion flow velocity measuring method which is used for carrying out error correction on unsteady state data within an acceptable range so as to obtain an accurate flow value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an infusion device of the present application;
FIG. 2 is a schematic diagram of a system module of the present application;
FIG. 3 is a circuit corresponding to the system module of the present application;
FIG. 4 is a schematic diagram of MCU functional modules;
FIG. 5 is a circuit of a display unit;
FIG. 6 is a power driver cell circuit;
fig. 7 is a flow chart of a measurement method described in the present application.
In the drawings, the list of components represented by the various numbers is as follows:
1-transfusion support, 2-liquid bottle and liquid bag protection frame, 3-liquid bottle or liquid bag, 4-transfusion pipeline and C1-and C2-weighing sensor.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without making creative efforts should fall within the scope of protection of the present application. In addition, directional words such as "upper", "lower", "left", "right", and the like, as used in the following embodiments are merely directions with reference to the drawings, and thus, the directional words used are intended to illustrate, not limit, the inventive concepts.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Meanwhile, the term used in the present specification includes any and all combinations of the items listed in association.
The invention will be further described with reference to the drawings and preferred embodiments.
Example 1:
as shown in fig. 1, an anti-interference intravenous infusion flow rate measurement device comprises: the infusion support 1, a liquid bottle or liquid bag 2, a liquid bottle and liquid bag protection frame 3, an infusion pipeline 4 and a flow rate measuring device;
the flow rate measuring device at least comprises weighing sensors C1 and C2;
the weighing sensor C1 is hung at the top of the liquid bottle or the liquid bag and is used for measuring the weight of the liquid bottle or the liquid bag;
the weighing sensor C2 is positioned at the bottom of the anti-interference intravenous transfusion flow velocity device and is used for measuring the whole weight of the device.
Example 2:
as shown in fig. 2, an anti-interference intravenous transfusion flow rate measurement system comprises two weighing sensors, two signal processing circuits, a signal reprocessing circuit and an MCU;
the weighing sensors are respectively connected with the signal processing circuits, the two signal processing circuits are connected with the signal reprocessing circuits, and the signal reprocessing circuits transmit signals to the MCU;
as shown in fig. 4, the MCU includes a storage module, a signal sampling module, a judging module, a calculating module, a clock signal module and a signal driving module, wherein the clock signal module is provided by an external clock source circuit; the signal reprocessing circuit transmits the signal to a signal sampling module in the MCU.
The anti-interference intravenous transfusion flow rate measurement system further comprises a display alarm device, wherein the display alarm device comprises a power driving unit, a display unit and a sound unit, the signal driving module is connected with the power driving unit, and the power driving unit is connected with the display unit and the sound unit.
The weight of the liquid medicine and the liquid medicine bracket is converted into an electric signal by using two weighing sensors, and as the electric signal is easy to submerge in the system, a signal processing circuit is needed to amplify the signal, so that the signal is convenient to transmit, and the processed circuit is processed again to obtain m Total (S) -m 0 And transmits the value of (2) to the MCU. The MCU is convenient to directly process, and errors caused by MCU faults are reduced.
Specific circuit diagram is shown in FIG. 3, in the initial stage, the MCU records m Total (S) -m 0 The value of m0 of m sum can be recorded in real time and stored in MCU moduleIn the block, and data acquisition after t time is carried out, the influence factor of the t moment can be obtained, and real-time correction is carried out. The influence factor at time t is recorded in the MCU for calling in calculating m real.
The M0 is a weighing sensor, namely a C1 position, the liquid bag is arranged at the C1 position, the M0 is used for measuring, the change caused by weight is converted into an electric signal, the change caused by weight is linear, after the electric level is generated, a signal processing circuit is used for amplifying the electric level, so that the identification and the improvement of the anti-jamming degree are facilitated, the amplified signal is fed to a controller (MCU), the change of C1 and C2 is conveniently monitored in real time, and on the basis, the signal processing is carried out again to obtain the difference value between the C1 and the C2, namely M Support frame The controller (MCU) can directly recognize whether the m bracket is in a normal state or not, and whether correction factors are needed to be used for correction or not is facilitated.
The signal work flow is as follows:
mo and m Total (S) Obtaining M after passing through a signal processing circuit 0 (treatment) M Total (treatment) And m Support (treatment) Wherein m is 0 (treatment) And m 0 Relationship between m Total (treatment) And m Total (S) The relation between them satisfies the formula: m is m Total (treatment) ＝m Total (S) * G+a, then, m Total (S) Obtainable (m Total (treatment) -a)/G, m0 is treated in the same way as m total,
MCU refers to clock source, sets fixed sampling rate t', for m Total (treatment) ，m 0 (treatment) ，m Support (treatment) Signal sampling is carried out, the acquired signals are recorded into a memory module in the MCU, and a processing formula satisfied by the signal processing circuit is m Total (treatment) ＝m Total (S) * G+a, then, m is always available (m Total (treatment) -a)/G, m0 is the same as m total, m Support frame ＝m Support (treatment) /G，
At this time, Δt is calculated from several points and t' obtained by sampling, and the calculation module uses the formulaCalculating the flow at the moment, transmitting the flow value to a display unit through a signal driving circuit, and dynamically displaying the flow value at the moment; the circuit diagram of the display unit is shown in fig. 5.
The storage unit records the initial weight of the m brackets, and records the initial weight as m Support (0) Meanwhile, m at different moments t in the process of changing the dynamics of C1 and C2 and the factors of the external environment of intravenous infusion Support frame The weight may be different, so if
The calculated change rate is greater than 1% and less than 10%, the infusion device is considered to be in an unstable acceptable state, at the moment, shaking is generated but the actual flow is not influenced, only the measured values of C1 and C2 are needed to be corrected, the correction of C1 and C2 is needed, at the moment, the m total (t) m0 (t) in the storage unit is called, and is called to the calculation module, and the correction factor at the moment is calculated
At this time, the sampling rate of each point is fixed, and therefore, assuming that the sampling rate is t ', t=t' (-1) is available; and (3) obtaining data Mtotal (processing) measured at the Nth point of the Mtotal. The first processed data is m0 (processing), and the data is corrected by combining the formula of the signal processing circuit and the correction factor
The driving circuit, as shown in FIG. 6, obtains Δm in N time periods Medicine liquid (C1) Or Deltam Medicine liquid (C2) The value of (2) is 0, the liquid medicine amount is not changed, the transfusion is finished or stopped, and the transfusion stop is likely to cause transfusion blockage, and the user is dealt with at the momentFor the equipment, the display signal and the sound signal should be transmitted to the display unit and the alarm unit through the driving circuit, and because the sound unit needs enough sound, a power driving circuit needs to be added for driving; as shown in fig. 6.
In addition, the correction factor only has correction within a certain range, so if the calculated weight change rate of the bracket is more than 25%, the infusion device is considered to be in an unstable and unacceptable state, and at the moment, the system transmits a display signal and a sound signal to the display unit and the alarm unit through the driving circuit to give an alarm.
Example 3:
as shown in fig. 7, a method for measuring the flow rate of anti-interference intravenous infusion comprises the following steps:
s1, obtaining initial data; before the transfusion starts, the weighing sensor C1 measures the common initial weight m of the liquid bottle or the liquid bag and the transfusion pipeline 0 The load cell C2 measures the initial weight m of the entire infusion device including the fluid bottle or bag, the infusion line and the stand Total (S) Initial bracket weight m Support frame ＝m Total (S) -m 0 ；
Since the infusion device is in a stable state at this time, the initial stent weight m obtained at this time Support frame Can represent the true weight of the stent.
S2, after transfusion starts, the weighing weights of C1 and C2 are acquired according to a preset weighing acquisition time interval delta t, and the real-time bracket weight m is calculated Support (t) The method comprises the steps of carrying out a first treatment on the surface of the Initial weight of bracket weight m Support (t) And a bracket m Support (0) And (5) comparing.
The weighing weights at times t C1 and C2 are m respectively 0(t) 、m Total (t) ；
The weights at times t+Δt C1 and C2 are m respectively 0(t+Δt) 、m Total (t+Deltat) ；
Then, the weight of the liquid medicine reduced by the infusion device in the period from the time t to the time t+delta t can be calculated by the change of the C1 measured value, namely
Δm Medicine liquid (C1) ＝m 0(t+Δt) -m 0(t)
Can also be calculated from the change in C2 measurement, i.e
Δm Medicine liquid (C2) ＝m Total (t+Deltat) -m Total (t) 。
If the infusion devices including the infusion support, the liquid bottle or the liquid bag, the liquid bottle and liquid bag protection frame and the infusion pipeline are stable within the period from the time t to the time t+delta t, the measured value m of C1 and C2 0(t) 、m Total (t) 、m 0(t+Δt) 、m Total (t+Deltat) Is accurate, and the reduced medicine liquid weight delta m obtained by calculation is no matter the change of the C1 measurement value or the change of the C2 measurement value Medicine liquid (C1) And Δm Medicine liquid (C2) Should be equal.
This is also the case in the prior art where the monitoring flow rate change is often calculated by calculating the amount of decrease in the liquid medicine by merely monitoring the change in the weight of the liquid bottle or liquid bag.
However, in the practical process, the infusion device including the infusion support, the liquid bottle or the liquid bag, the liquid bottle and liquid bag protection frame and the infusion pipeline cannot always keep a stable state. For example, if the patient moves to pull the infusion line to shake the infusion bottle or bag, the measurements of C1 and C2 will be inaccurate, resulting in a reduced weight Δm of the fluid Medicine liquid (C1) And Δm Medicine liquid (C2) Inaccuracy, Δm of Medicine liquid (C1) And Δm Medicine liquid (C2) Are not necessarily equal.
If the amplitude of the shaking is within a certain degree and a certain time, although the measurement of the weight is inaccurate and the accuracy of the flow is affected, the actual flow is not affected or the influence on the actual flow is limited, the flow value calculated by measurement can be approximate to the actual flow value through correction. The invention corrects other measured values by taking the weight of the bracket as a basic reference so as to eliminate the influence, and the specific method is as follows:
initial bracket weight m Support frame ＝m Total (S) -m 0 The method comprises the steps of carrying out a first treatment on the surface of the Since the infusion device is in a stable state at this time, the initial stent weight m obtained at this time Support frame Can represent the true weight of the bracket。
And the weight of the bracket calculated at time t
m Support (t) ＝m Total (t) -m 0(t) ；
Bracket weight calculated at time t+delta t
m Support (t+delta t) ＝m Total (t+Deltat) -m 0(t+Δt) ；
If the device is unstable at time t or t+Δt, then the measured value m of C1 and C2 0(t) 、m Total (t) 、m 0(t+Δt) 、m Total (t+Deltat) Is inaccurate, then m Support (t) And m Support (t+delta t) It is naturally not possible to represent the true weight of the bracket, but rather there is a relationship with the true weight of the bracket. We will refer to the ratio of the difference between the measured weight and the actual weight to the actual weight as the influence factor delta
Throughout the process, although the weight of the liquid medicine is reduced, the weight of the stent is unchanged, and the true weight m of the stent Support frame From the beginning, we can therefore calculate the influencing factor at time t by the weight of the scaffold, i.e
So that the influence factor delta can be used t Calculating the corresponding actual weight of the weight according to other measured weights at the time t; i.e.
Thus, for C1 and C2, the resulting m is measured 0(t) 、m Total (t) 、m 0(t+Δt) 、m Total (t+Deltat) The corresponding actual weights are respectively
Then, at this time, from the time t to the time t+Δt, the actual reduced liquid medicine is calculated by the C1 measurement value to be
The calculation by C2 measurement should be
S3: degree of shaking amplitudeHas a certain relation to the values of (a). Through a plurality of experiments, if delta t If the concentration is not more than 1%, the infusion device is considered to be in a stable state, the change of delta t time C1 or C2 and the flow rate is +.>Or->Transmitting the flow value to a memory display device, preferably +.>
S4: if delta t If the ratio is more than 1% and less than 10%, the infusion device is considered to be in an unstable and acceptable state, and at the moment, shaking occurs, the actual flow is not influenced, and only the C1 and C2 measured values are required to be corrected. Obtaining correction factors by taking the weight of the bracket as a reference
The actual reduced liquid medicine from the time t to the time t+delta t is calculated by C1 measured value after correction
The calculation by C2 measurement should be
The flow rate is then
Δm Medicine liquid (C1) ′/Δt；
Δm Medicine liquid (C2) ′/Δt；
Preferably Δm Medicine liquid (C2) ′/Δt。
S5: if delta t Greater than 25%, the infusion device is deemed to be in an unstable unacceptable state, at which point an alarm should be raised.
If the preset time of nDeltat, deltam Medicine liquid (C1) Or Deltam Medicine liquid (C2) The value of (2) is 0, and the amount of the liquid medicine is not changed, and the transfusion is finished or stopped, and an alarm is sent out.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (9)
1. An anti-interference intravenous infusion flow rate measurement method is characterized by comprising the following steps:
s1, acquiring initial data; measuring a liquid bottle or a liquid bag and an infusion pipeline by using a weighing sensor C1; measuring the weight of the whole infusion device by using a weighing sensor C2;
s2, acquiring real-time weighing weights of the weighing sensor C1 and the weighing sensor C2 according to a preset weighing acquisition time interval delta t, and calculating real-time bracket weight m Support (t) The method comprises the steps of carrying out a first treatment on the surface of the The weighing weights at times t C1 and C2 are m respectively 0(t) 、m Total (t) ；
m Support (t) ＝m Total (t) -m 0(t) ；
S3, the initial weight m of the bracket weight Support (0) And a bracket m Support (t) Comparing, and calculating the difference change rate of the two;
if the change rate of the difference between the two is less than or equal to 1%, the system considers that the infusion device is in a stable state, and the change of the delta t time weighing sensor C1 or C2 is the reduced weight of the liquid medicine; the flow rate in the steady state isOr (b)
Wherein m is 0(t+Δt) 、m Total (t+Deltat) The weight of the weighing sensor C1 and the weight of the weighing sensor C2 at the moment of t+delta t respectively;
s4, if the change rate of the difference is greater than 1% and less than 10%, the system considers that the infusion device is in an unstable acceptable state, and the measured values of the symmetrical weight sensors C1 and C2 are corrected; transmitting the corrected calculated flow value to a storage display device;
the correction of the C1, C2 measurement is specifically:
introducing an influence factor delta, wherein the influence factor delta is the ratio of the difference value between the measured weight and the actual weight to the actual weight,
calculating the influencing factor at time t by the weight of the bracket, i.e
So that the influence factor delta can be used t Calculating the corresponding actual weight of the weight according to other measured weights at the time t; i.e.
Then, at this time, from the time t to the time t+Δt, the actual reduced liquid medicine is calculated by the C1 measurement value to be
The calculation by C2 measurement should be
The corrected flow value is delta m Medicine liquid (C1) ′/Δt；
Δm Medicine liquid (C2) ′/Δt；
Recording Δm Medicine liquid (C2) ′/Δt；
S5, if the difference change rate is greater than 25% in the preset n delta t time, the infusion device is considered to be in an unstable and unacceptable state, and the system sends out an alarm at the moment; wherein n is an integer, and nΔt represents n acquisition time intervals; the nDeltat is 0.1-5 s.
2. The method for measuring the flow rate of an anti-interference intravenous infusion according to claim 1, wherein the initial data acquisition in the step S1 is specifically a common initial weight m of the liquid bottle or the liquid bag and the infusion line measured by the weighing sensor C1 0(0) The method comprises the steps of carrying out a first treatment on the surface of the The whole infusion device initial weight m comprising the liquid bottle or liquid bag, the infusion pipeline and the bracket and measured by the weighing sensor C2 Total (0) The initial bracket weight is
m Support (0) ＝m Total (0) -m 0(0) 。
3. The method of claim 1, wherein in step S3, the change of the measured value of C1 is used to calculate the weight of the liquid medicine reduced by the infusion device in the period from time t to time t+Δt, namely
Δm Medicine liquid (C1) ＝m 0(t+Δt) -m 0(t)
The reduced weight of the liquid medicine of the transfusion device is obtained by the same calculation through the change of the C2 measured value, namely
Δm Medicine liquid (C2) ＝m Total (t+Deltat) -m Total (t)
If the infusion device including the infusion support, the liquid bottle or the liquid bag, the liquid bottle and liquid bag protection frame and the infusion pipeline is stable within the period from the time t to the time t+delta t, the calculated reduced liquid medicine weight delta m Medicine liquid (C1) And Deltam Medicine liquid (C2) Equal.
4. The method for measuring the flow rate of anti-interference intravenous transfusion according to claim 1, wherein in step S3, the flow rate value in the steady state is setTransmitting to a storage display device.
5. A method for measuring an anti-interference intravenous infusion flow rate according to claim 3, wherein Δm is a predetermined time period of nΔt Medicine liquid (C1) Or Deltam Medicine liquid (C2) The system recognizes that the infusion is complete or that the infusion is stopped and the system sounds an alarm.
6. The anti-interference intravenous transfusion flow rate measurement system is characterized by comprising a weighing sensor C1, a weighing sensor C2, two signal processing circuits, a signal reprocessing circuit and an MCU; the anti-interference intravenous transfusion flow rate measuring system is suitable for the anti-interference intravenous transfusion flow rate measuring method according to any one of claims 1 to 5;
the weighing sensor C1 and the weighing sensor C2 are respectively connected with signal processing circuits, the two signal processing circuits are connected with the signal reprocessing circuits, and the signal reprocessing circuits transmit signals to the MCU.
7. The anti-interference intravenous infusion flow rate measurement system according to claim 6, wherein the MCU comprises a storage module, a signal sampling module, a judgment module, a calculation module, a clock signal module and a signal driving module, wherein the clock signal module is provided by an external clock source circuit; the signal reprocessing circuit transmits the signal to a signal sampling module in the MCU.
8. The anti-interference intravenous infusion flow rate measurement system according to claim 7, further comprising a display alarm device, wherein the display alarm device comprises a power driving unit, a display unit and a sound unit, the signal driving module is connected with the power driving unit, and the power driving unit is connected with the display unit and the sound unit.
9. An anti-interference intravenous transfusion flow rate measuring device comprises a transfusion bracket, a liquid bottle or a liquid bag, a liquid bottle and liquid bag protection frame, a transfusion pipeline and a flow rate measuring device; the flow rate measuring device is characterized by comprising a weighing sensor C1 and a weighing sensor C2; the anti-interference intravenous transfusion flow rate testing device is suitable for the anti-interference intravenous flow rate measuring method according to any one of claims 1-5;
the weighing sensor C1 is used for measuring the weight of a liquid bottle or a liquid bag;
the load cell C2 is used to measure the overall weight of the device.
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