Method for calculating the weight of liquid added during an infusion process and system therefor

Abstract

The application provides a method and system for calculating the weight of added liquid in an infusion process, comprising the following steps: sampling the residual liquid weight in real time, converting the residual liquid weight into weighing sampling data, obtaining the absolute value of the change value of the weighing sampling data, judging whether the absolute value is greater than the maximum limited value of the change value of the weighing sampling data, if not, recording the time before mutation or the time after mutation, if the time is the time after mutation, judging whether the time is continuous and meets the preset number, if yes, fitting the residual liquid weight after mutation, judging whether the fitting goodness meets the preset value, if yes, expressing the fitting curve equation of the residual liquid weight after mutation, and calculating the time when the added liquid is finished, the residual liquid amount when the added liquid is finished, and the infusion rate when the added liquid is finished according to the expression, so as to calculate the weight of the added liquid in the infusion process. The application can accurately calculate the weight of the added liquid, has high accuracy, and can further improve the safety performance.

Description

Technical Field

[0001] This invention relates to the field of infusion monitoring technology, specifically to a method for calculating the weight of fluid added during infusion and a system for applying this method. Background Technology

[0002] With the advancement of technology and the progress of the times, in order to reduce the workload of medical staff and save labor costs, more and more intelligent medical devices with weighing functions have entered the era of information management. These devices monitor parameters such as the amount of fluid infused and the remaining fluid volume by adding a weighing module, thereby achieving digital infusion management. Examples include infusion management systems, electronic infusion scales, flow management systems, and flushing and suction systems.

[0003] In some devices with infusion and aspiration functions, a very important parameter is often seen: the infusion-absorption difference. This difference is the sum of the infused volume and the aspirated volume. It reflects the balance between infusion and aspiration, as detailed below:

[0004] (1) When the difference between infusion and absorption is zero, the infused volume equals the absorbed volume, and the system is in a state of infusion-absorption balance.

[0005] (2) When the difference between infusion and absorption is greater than zero, the infused volume is greater than the absorbed volume, and the system is in a state of more infusion and less absorption.

[0006] (3) When the difference between infusion and absorption is less than zero, the infused volume is less than the absorbed volume, and the system is in a state of less infusion and more absorption.

[0007] Medical staff can set a maximum limit for the difference in intravenous fluid absorption. When the difference in intravenous fluid absorption exceeds this maximum limit, a warning will be issued to medical staff to take protective measures to ensure the safety of intravenous infusion.

[0008] The infusion volume at a given time point is usually calculated as the initial infusion weight minus the remaining infusion volume. Similarly, the aspirated volume at a given time point is calculated as the total aspirated weight minus the initial aspirated volume at that time point. Clinically, a common situation is that medication needs to be added or infusion bags / bottles changed during infusion. Calculating the weight of these additions or changes is difficult. To address this, the common practice is for medical staff to stop treatment and pause the system before adding or changing the infusion bag / bottle. After the procedure, the system is then switched back to treatment mode. This allows the subsystem to recognize the weight change as an increase or decrease in medication volume when switching from paused to treatment mode.

[0009] However, while this method itself is not problematic in identifying the addition of medication or the replacement of infusion bottles (bags), a common clinical situation arises where medication needs to be added or infusion bottles (bags) replaced directly during treatment. Alternatively, medical staff may forget to pause the system during treatment and then add medication or replace the infusion bottle (bag) directly. This can lead to the inability to identify the weight of the newly added medication or the weight of the medication in the newly replaced infusion bottle (bag), posing a significant safety hazard and potentially causing a medical accident due to this oversight. Summary of the Invention

[0010] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a method and system for calculating the weight of liquid added during infusion. Compared with the existing drug addition schemes, the method and system can improve the problems encountered above, avoid safety hazards, and thus ensure the safety of infusion.

[0011] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0012] A method for calculating the weight of fluid added during intravenous infusion includes real-time sampling of the remaining fluid weight, converting the remaining fluid weight into weighing sampling data and storing it in a buffer unit, obtaining the absolute value of the change in the weighing sampling data, determining whether the value is greater than a maximum limit value for the change in the weighing sampling data, if not, recording the time before or after the weight change occurs, if the time is after the weight change disappears, determining whether the time after the weight change disappears is continuous and meets a preset quantity, if so, fitting the remaining fluid weight after the weight change disappears, determining whether the goodness of fit meets a preset value, if so, fitting a curve equation expression based on the remaining fluid weight after the weight change disappears, and sequentially calculating the time to completion of fluid addition, the remaining fluid volume after completion of fluid addition, and the infusion rate after completion of fluid addition, thereby calculating the weight of fluid added during the infusion process.

[0013] According to the present invention, a method for calculating the weight of added fluid during infusion is provided. If the time is before the occurrence of a weight mutation, it is determined whether the time before the weight mutation is continuous and meets a preset quantity. The remaining fluid weight before the weight mutation is fitted, and it is determined whether the goodness of fit meets a preset value. If so, the curve equation expression of the remaining fluid weight before the weight mutation is fitted is used. Based on the curve equation expression, the starting time of adding fluid, the initial remaining fluid volume of adding fluid, and the starting infusion rate of adding fluid are calculated sequentially. Then, the absolute value of the change value of the weighing sampling data is obtained.

[0014] According to the present invention, a method for calculating the weight of fluid added during intravenous infusion is provided. If, during the infusion process, medication is added, the entire medication addition process is set from t...s From the moment t e Time expired, t s t e The weights at time points are Wt. s Wt e From t s Time to t e If the infusion rate at time t is v(t), then during the infusion process, (t... s ,t e The expression for the weight W of the liquid added at any given time is given by formula (1):

[0015]

[0016] in, For (t) s ,t e The infusion volume at any given time.

[0017] According to the method for calculating the weight of added fluid during infusion provided by the present invention, under the condition of undisturbed infusion, the expression for the remaining fluid weight at time (0, t) is set as W(t), and the expression for the infusion rate from time (0, t) is v(t), which is expressed as formula (2):

[0018]

[0019] According to the method for calculating the weight of fluid added during infusion provided by the present invention, the following steps are taken when fitting the curve equation expression:

[0020] via t s The curve equation W is obtained by fitting the remaining liquid weight before time step. s (t);

[0021] via t e The curve equation W is fitted to the remaining liquid weight after time step. e (t);

[0022] Find t s The expression for the infusion rate at time t is v(t) s ) and t e The expression for the infusion rate at time t is v(t) e );

[0023] via v(t) s ), v(t) e ), estimate (t) s ,t e The infusion rate at time t is v(t);

[0024] Estimate (t) s ,t eInfusion volume at any given time;

[0025] Calculate (t) s ,t e The amount of liquid added at any given time.

[0026] According to the present invention, a method for calculating the weight of added liquid during infusion is provided. When the remaining liquid weight is sampled in real time, the remaining weight of the drug solution to be measured is converted into an electrical signal by a weighing sensor. The electrical signal of the weighing sensor is collected by a weighing signal ADC sampling circuit, and then the sampled weighing data is transmitted to a microprocessor for calculation.

[0027] According to a method for calculating the weight of fluid added during infusion according to the present invention, the microprocessor performs computational processing, including:

[0028] The microprocessor allocates a memory unit of length N as a buffer unit for weighing sampling data. This buffer unit is used to store the weighing sampling data that needs to be processed.

[0029] A memory cell of length M is allocated by the microprocessor as a differential unit for weighing sampling data. This unit is used to store the change value ΔW of the weighing sampling data at an interval of ΔT.

[0030] The change values ​​ΔW1, ΔW2, ΔW3, ..., ΔW3 of multiple weighing sampling data are obtained. M .

[0031] According to a method for calculating the weight of added fluid during infusion provided by the present invention, a maximum limit value W is set for the change value of the weighing sampling data. L Let t1 be the time before the weight mutation occurs and t2 be the time after the weight mutation disappears. Then, determine whether the absolute value of the change in the obtained weighing sample data is less than the maximum limit value W of the change in the weighing sample data. L ;

[0032] Multiple curve fittings were performed on N1 weight data points prior to the weight mutation at time t1, and the goodness-of-fit R-value was used to determine the results. 2 The value and the amount of non-mutation data are determined by t. s Time, and t s Equation W of the remaining liquid weight curve before time point s (t);

[0033] Multiple curve fittings were performed on N2 weight data points prior to the weight mutation at time t2, and the goodness-of-fit R-value was used to determine the results. 2 The value and the amount of non-mutation data are determined by t. e Time, and t e Equation W of the remaining liquid weight curve before time point e(t).

[0034] According to the present invention, a method for calculating the weight of fluid added during infusion is provided to determine t. s W s (t), t e W e (t), find t s Infusion rate v(t) at time t s ) and t e Infusion rate v(t) at time t e );

[0035] Estimate (t) s ,t e Infusion volume at any given time;

[0036] Based on W s (t s W e (t e ) and estimate (t s ,t e ) Calculate the infusion volume at time t during the infusion process. s ,t e Add liquid weight W at regular intervals.

[0037] A system for calculating the weight of fluid added during infusion, comprising:

[0038] The system includes an infusion weighing assembly, an infusion monitoring workstation, an infusion pump, an injection pump, a waste liquid weighing assembly, and a trolley support frame. The infusion weighing assembly is positioned above the infusion monitoring workstation, which is mounted on the trolley support frame. The infusion pump and injection pump can be installed in the passageway compartment of the infusion monitoring workstation. The waste liquid weighing assembly is positioned below the infusion monitoring workstation. The infusion weighing assembly is used to measure the weight of suspended infusion bags or bottles, while the waste liquid weighing assembly is used to measure the weight of suspended waste liquid bags or bottles.

[0039] Therefore, compared with the prior art, this invention identifies the time when the medication is added and calculates the weight of the remaining medication before addition; identifies the time when the medication is added and calculates the weight of the remaining medication after addition; calculates the infusion volume from the time the medication is added to the time when it is added; calculates the difference between the weight of the remaining medication after addition and the weight of the remaining medication before addition; finally, the weight of the medication added during the infusion process is equal to the difference between the weight of the remaining medication after addition and the weight of the remaining medication before addition plus the infusion volume during the medication addition process. This allows for a precise calculation of the weight of the added medication with high accuracy, further improving safety performance.

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0041] Figure 1 This is a flowchart of an embodiment of a method for calculating the weight of liquid added during infusion according to the present invention.

[0042] Figure 2 This is a schematic diagram illustrating the trend of remaining liquid weight change when no liquid is added, according to an embodiment of the method for calculating the weight of liquid added during infusion in this invention.

[0043] Figure 3 This is a block diagram illustrating the principle of a microprocessor in an embodiment of a method for calculating the weight of liquid added during infusion according to the present invention.

[0044] Figure 4 This is a schematic diagram illustrating the relationship between the remaining fluid weight and time in an embodiment of a method for calculating the weight of fluid added during infusion according to the present invention.

[0045] Figure 5 This is a trend graph showing the change in the weight of the remaining fluid in an embodiment of the method for calculating the weight of added fluid during infusion according to the present invention.

[0046] Figure 6 This is an embodiment of a method for calculating the weight of fluid added during infusion in this invention, specifically regarding the calculation of (t) using combined data. s ,t e A diagram showing the amount of liquid added at any given time.

[0047] Figure 7 This is a trend graph showing the remaining liquid weight around t=40 in an embodiment of a method for calculating the weight of added liquid during infusion according to the present invention.

[0048] Figure 8 This is a schematic diagram of an embodiment of the device for calculating the weight of liquid added during infusion according to the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0050] An embodiment of a method for calculating the weight of fluid added during infusion.

[0051] See Figures 1 to 7 This invention provides a method for calculating the weight of fluid added during intravenous infusion, the method comprising the following steps:

[0052] The remaining liquid weight is sampled in real time, converted into weighing sampling data, and stored in a buffer unit. The absolute value of the change in the weighing sampling data is obtained, and it is determined whether this value is greater than the maximum limit of the change in the weighing sampling data. If not, the time before the weight change occurs or the time after the weight change disappears is recorded. If the time is after the weight change disappears, it is determined whether the time after the weight change disappears is continuous and meets the preset quantity. If so, the remaining liquid weight after the weight change disappears is fitted, and it is determined whether the goodness of fit meets the preset value. If so, the curve equation expression is fitted using the remaining liquid weight after the weight change disappears. Based on the curve equation expression, the time of liquid addition completion, the remaining liquid volume after liquid addition completion, and the infusion rate after liquid addition completion are calculated sequentially, thereby calculating the weight of liquid added during the infusion process.

[0053] In this embodiment, if the time is before the weight mutation occurs, it is determined whether the time before the weight mutation occurs is continuous and meets the preset quantity. The remaining liquid weight before the weight mutation occurs is fitted, and it is determined whether the goodness of fit meets the preset value. If so, the curve equation expression of the remaining liquid weight before the weight mutation occurs is fitted. Based on the curve equation expression, the liquid addition start time, the initial remaining liquid volume, and the initial infusion rate are calculated sequentially. Then, the absolute value of the change value of the weighing sampling data is obtained.

[0054] In this embodiment, as Figure 2 As shown, if no medication is added, the remaining fluid weight should decrease along the dotted line. If medication is added during the infusion process, the entire medication addition process is set from t... s From the moment t e Time expired, t s t e The weights at time points are Wt. s Wt e From t s Time to t e If the infusion rate at time t is v(t), then during the infusion process, (t... s ,t e The expression for the weight W of the liquid added at any given time is given by formula (1):

[0055]

[0056] in, For (t) s ,t e The infusion volume at any given time.

[0057] Under ideal infusion conditions without any interference, let W(t) be the expression for the remaining fluid weight at time (0, t), then the expression for the infusion rate at time (0, t) is v(t), which is expressed as formula (2):

[0058]

[0059] Therefore, when fitting the equation of a curve, the following steps can be taken:

[0060] (1) Through t s The curve equation W is obtained by fitting the remaining liquid weight before time step. s (t);

[0061] (2) Through t e The curve equation W is fitted to the remaining liquid weight after time step. e (t); where, in practical applications, the above two equations W s (t), W e (t) often needs to be determined by the goodness-of-fit R. 2 Perform correction of the fitting interval.

[0062] (3) Find t s The expression for the infusion rate at time t is v(t) s ) and t e The expression for the infusion rate at time t is v(t) e );

[0063] (4) via v(t) s ), v(t) e ), estimate (t) s ,t e The infusion rate at time t is v(t);

[0064] (5) Estimate (t) s ,t e Infusion volume at any given time;

[0065] (6) Calculate (t) s ,t e The amount of liquid added at any given time.

[0066] like Figure 6 As shown, t s The curve equation W is obtained by fitting the remaining liquid weight before time step. s (t) = -0.574t + 880.6.

[0067] t s The remaining liquid weight W before time [time] s (t s It is approximately equal to 861 mL.

[0068] t e The curve equation W is fitted to the remaining liquid weight after time step. e (t) = -0.535 + 856.33.

[0069] t e The remaining liquid weight W after time t. e (t e It is approximately equal to 856 mL.

[0070] v(t s = -0.574 mL / s.

[0071] v(t e = -0.535mL / s.

[0072] In this embodiment, (t) is taken s ,t e The average rate at time t is used as the infusion rate to estimate (t) s ,t e The infusion volume at that time was approximately 4.436 mL.

[0073] Finally, the value of (t) was calculated. s ,t e The amount of medication added at that moment is approximately 0.564 mL. Excluding the influence of calculation errors, this is considered to be a shaking motion during the infusion process. (A minimum medication volume limit can be added; amounts less than this value are considered as no medication being added).

[0074] In this embodiment, as Figure 3 As shown, when sampling the remaining liquid weight in real time, the remaining weight of the liquid to be measured is converted into an electrical signal by the weighing sensor. The electrical signal of the weighing sensor is collected by the weighing signal ADC sampling circuit, and then the sampled weighing data is transmitted to the microprocessor for calculation and processing.

[0075] In this embodiment, the microprocessor performs computational processing, including:

[0076] The microprocessor allocates a memory unit of length N as a buffer unit for weighing sampling data. This buffer unit is used to store the weighing sampling data that needs to be processed, as shown in Table (1). The length of N needs to be determined by mathematical modeling analysis based on the actual system.

[0077] 1 2 3 5 … N-2 N-2 N-1 N <![CDATA[W1]]> <![CDATA[W2]]> <![CDATA[W3]]> <![CDATA[W5]]> … <![CDATA[W N-3 ]]> <![CDATA[W N-2 ]]> <![CDATA[W N-1 ]]> <![CDATA[W N ]]> (1)

[0079] A memory cell of length M is allocated by the microprocessor as a differential unit for weighing sampling data. This unit is used to store the change value ΔW of the weighing sampling data at an interval of ΔT, as shown in Table (2); where T is set to M. n ,T m The weight at time is W n W m The interval is ΔT = T m -T n If (m>n), then the change in the weighing sample data ΔW=W m -W n The interval time ΔT needs to be determined based on the actual system and mathematical modeling analysis.

[0080] 1 2 3 4 5 … M-2 M-2 M-1 M <![CDATA[ΔW1]]> <![CDATA[ΔW2]]> <![CDATA[ΔW3]]> <![CDATA[ΔW4]]> <![CDATA[ΔW5]]> … <![CDATA[ΔW M-3 ]]> <![CDATA[ΔW M-2 ]]> <![CDATA[ΔW M-1 ]]> <![CDATA[ΔW M ]]> (2)

[0082] The change values ​​ΔW1, ΔW2, ΔW3, ..., ΔW3 of multiple weighing sampling data are obtained. M .

[0083] Set the maximum limit W for the change in weighing sample data. L Let t1 be the time before the weight mutation occurs and t2 be the time after the weight mutation disappears. Then, determine the absolute values ​​of the changes in the obtained weighing sample data: |ΔW1|, |ΔW2|, |ΔW3|, ..., |ΔW M |Is it less than the maximum limit W for the change in the weighing sample data? L Among them, the maximum limit value W L Its function is to determine if there is a sudden change in weight during weighing. If there is a sudden change, it records the sequence number in the weighing sampling data buffer unit before the change occurred and the sequence number in the weighing sampling data buffer unit after the change disappeared. Let t1 be the time before the change occurred and t2 be the time after the change disappeared. Of course, t1 is not necessarily the same as the time when liquid was added. s The time, and t2, is not necessarily the time when the liquid is added and t is completed. e This is because there is often a lag between the addition of the medicine and a change in weight.

[0084] Multiple curve fittings were performed on N1 weight data points prior to the weight mutation at time t1, and the goodness-of-fit R-value was used to determine the results. 2 The value and the amount of non-mutation data are determined by t. s Time, and t s Equation W of the remaining liquid weight curve before time point s (t);

[0085] Multiple curve fittings were performed on N2 weight data points prior to the weight mutation at time t2, and the goodness-of-fit R-value was used to determine the results.2 The value and the amount of non-mutation data are determined by t. e Time, and t e Equation W of the remaining liquid weight curve before time point e (t). Linear fitting is a special case of curve fitting and cannot be excluded from the scheme of this embodiment. Goodness of fit refers to the degree to which the regression line fits the observed values; the statistic for measuring goodness of fit is the coefficient of determination (also known as the coefficient of certainty) R0. 2 R 2 The maximum value is 1. R 2 The closer the R value is to 1, the better the regression line fits the observed values; conversely, the closer the R value is to 1, the better the regression line fits the observed values. 2 The smaller the value of , the worse the regression line fits the observed values. Specifically, when fitting the optimal curve equation, R is not... 2 The largest is not necessarily the best, but rather R 2 If the requirements are met, the amount of non-mutation sampling data should also be considered. The smaller the amount of data, the larger the fitting error. If the amount of data is too large, it will not be of much reference value.

[0086] Then, determine t s W s (t), t e W e (t), find t s Infusion rate v(t) at time t s ) and t e Infusion rate v(t) at time t e );

[0087] via v(t) s ), v(t) e ), t s , t e Estimating (t) using parameters s ,t e The infusion volume at time t; where, in this embodiment, the estimation is based on only knowing v(t) s ), v(t) e ), in (t s ,t e The actual velocity within a given time interval cannot be determined; it can only be estimated through mathematical modeling and analysis. If a system's velocity within a given time interval cannot be determined through other means, then... s ,t e If the infusion rate is [value], then directly substitute it into the formula: Perform calculations (t) s ,t e The infusion volume at any given time.

[0088] Finally, based on W s (t s W e (te ) and estimate (t s ,t e ) Calculate the infusion volume at time t during the infusion process. s ,t e Add liquid weight W at regular intervals.

[0089] In practical applications, as shown in Table (3) and Figure 4 As shown, 60 weighing data points (in mL) are provided, with approximately 150 mL of medication added during the infusion process. t represents the sampling time sequence (in seconds), W(t) represents the remaining weight at time t (in mL), ΔW represents the change in remaining weight, and R... 2 The goodness of fit is denoted as .

[0090]

[0091] (3)

[0093] Based on the actual system, mathematical modeling and analysis were used to determine the following parameters:

[0094] (1) Weighing sampling data buffer unit N = 60 or greater;

[0095] (2) The differential unit of the weighing sampling data is M = 60 or greater;

[0096] (3) The interval time is ΔT = 1 second;

[0097] (4) Maximum limit value W of the change value of weighing sampling data L =5mL;

[0098] (5) The time of the first mutation was t1 = 24, and W1 = 957 mL;

[0099] The second mutation time was t2 = 38, and W2 = 1094 mL.

[0100] (6) The weighing sampling data in the intervals (0, t1) and (t2, 60) were fitted multiple times. In this embodiment, the modeling was found to be close to linear, so linear fitting was used. The specific fitting method used depends on the actual situation. In this embodiment, the goodness of fit R was used. 2 Comparing the values, it was found that the goodness of fit was very good in multiple fittings, and the calculated t... s Consistent with t1, t e It is very consistent with t2, so t can be made s =t1, let t e =t2.

[0101] (7) The equation obtained by fitting (0, t1) is y1=-0.9517x+979.61. From the expression, it can be seen that the weight sampled by the system at time (0, t1) is decreasing at a rate of v1=0.9517mL / s (i.e., infusion rate).

[0102] The equation obtained by fitting (t2, 60) is y2 = -0.8636x + 1094.8. From this expression, we can see that the weight sampled by the system at time (t2, 60) is decreasing at a rate of v2 = 0.8636 mL / s (i.e., the infusion rate). Figure 5 As shown.

[0103] (8) Calculate the weight change of the system at (t1, t2). The weight change of the system consists of two parts:

[0104] The first part is the actual weight change W2-W1 at time (t1, t2);

[0105] The second part estimates the infusion volume W at time (t1, t2) using parameters such as v1, t1, v2, t1, W1, and W2. g .

[0106] In this embodiment, t2-t1 = 14 seconds, and the infusion rate is taken as an average value v = (v1+v2) / 2 = (0.9517+0.8636) / 2 = 0.90765 mL / s.

[0107] The infusion volume W at time (t1, t2) g It is approximately equal to (v1+v2) / 2*(t2-t1)=12.7071mL.

[0108] Therefore: The weight change of the system at (t1, t2) = W2 - W1 + W g =1094-957+12.7071=149.7071mL. 150mL of medication was added during the infusion. The calculated result is very close to the actual result and is within the error range.

[0109] like Figure 7 As shown, around t=40, since the change in the weighing sampling data within a certain period after the mutation did not meet the requirement of "continuous and meeting the preset quantity", this time was not recognized as the completion of adding the medicine. Other calculations are the same as the above steps, and will not be elaborated here.

[0110] An embodiment of a system for calculating the weight of fluid added during infusion.

[0111] like Figure 8 As shown in the figure, this embodiment provides a system for calculating the weight of fluid added during infusion, comprising:

[0112] The system includes an infusion weighing assembly 1, an infusion monitoring workstation 2, an infusion pump 3, an injection pump 4, a waste liquid weighing assembly 5, and a trolley support frame 6. The infusion weighing assembly is positioned above the infusion monitoring workstation 2, which is mounted on the trolley support frame 6. The infusion pump 3 and injection pump 4 can be installed in the passageway compartment of the infusion monitoring workstation 2 (in any order). The waste liquid weighing assembly 5 is positioned below the infusion monitoring workstation 2. The infusion weighing assembly 1 is used to measure the weight of the suspended infusion bag or bottle, and the waste liquid weighing assembly 5 is used to measure the weight of the suspended waste liquid bag or bottle. The fluid balance can be calculated using the weights of the infusion bag or bottle and the waste liquid bag or bottle.

[0113] Therefore, compared with the prior art, this invention identifies the time when the medication is added and calculates the weight of the remaining medication before addition; identifies the time when the medication is added and calculates the weight of the remaining medication after addition; calculates the infusion volume from the time the medication is added to the time when it is added; calculates the difference between the weight of the remaining medication after addition and the weight of the remaining medication before addition; finally, the weight of the medication added during the infusion process is equal to the difference between the weight of the remaining medication after addition and the weight of the remaining medication before addition plus the infusion volume during the medication addition process. This allows for a precise calculation of the weight of the added medication with high accuracy, further improving safety performance.

[0114] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0115] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for calculating the weight of fluid added during intravenous infusion, characterized in that, The method includes the following steps: The remaining liquid weight is sampled in real time, converted into weighing sampling data, and stored in a buffer unit. The absolute value of the change in the weighing sampling data is obtained, and it is determined whether the absolute value is greater than the maximum limit of the change in the weighing sampling data. If not, the time before the weight change occurs or the time after the weight change disappears is recorded. If the time is after the weight change disappears, it is determined whether the time after the weight change disappears is continuous and meets the preset quantity. If so, the remaining liquid weight after the weight change disappears is fitted, and it is determined whether the goodness of fit meets the preset value. If so, the curve equation expression is fitted by the remaining liquid weight after the weight change disappears. Based on the curve equation expression, the time of liquid addition completion, the remaining liquid volume after liquid addition completion, and the infusion rate after liquid addition completion are calculated in sequence, thereby calculating the weight of liquid added during the infusion process. If the time is before the weight mutation occurs, determine whether the time before the weight mutation occurs is continuous and meets the preset quantity. Fit the remaining liquid weight before the weight mutation occurs and determine whether the goodness of fit meets the preset value. If so, use the curve equation expression of the remaining liquid weight before the weight mutation occurs to calculate the liquid addition start time, the initial remaining liquid volume after liquid addition, and the initial infusion rate after liquid addition in sequence according to the curve equation expression. Then continue to obtain the absolute value of the change value of the weighing sampling data.

2. The method according to claim 1, characterized in that: If medication is added during the infusion process, the entire medication addition process is set from t s From the moment on, t e Time expired, t s t e The weights at time points are Wt. s Wt e From t s Time to t e If the infusion rate at time t is v(t), then during the infusion process, (t... s ,t e The expression for the weight W of the liquid added at any given time is formula (1): （1） in, For (t) s ,t e The infusion volume at any given time.

3. The method according to claim 2, characterized in that: Under undisturbed infusion conditions, let W(t) be the expression for the remaining fluid weight at time (0, t), then the expression for the infusion rate at time (0, t) is v(t), expressed as formula (2): （2）。 4. The method according to claim 3, characterized in that: When fitting the equation of the curve, follow these steps: via t s The curve equation W is obtained by fitting the remaining liquid weight before time step. s (t); via t e The curve equation W is fitted to the remaining liquid weight after time step. e (t); Find t s The expression for the infusion rate at time t is v(t) s ) and t e The expression for the infusion rate at time t is v(t) e ); via v(t) s ), v(t) e ), estimate (t) s ,t e The infusion rate at time t is v(t); Estimate (t) s ,t e The infusion volume at any given time; Calculate (t) s ,t e The amount of liquid added at any given time.

5. The method according to claim 4, characterized in that: When sampling the remaining liquid weight in real time, the remaining weight of the liquid to be tested is converted into an electrical signal by a weighing sensor. The electrical signal of the weighing sensor is collected by the weighing signal ADC sampling circuit, and then the sampled weighing data is transmitted to the microprocessor for calculation and processing.

6. The method according to claim 5, characterized in that, The microprocessor performs computational processing, including: The microprocessor allocates a memory unit of length N as a buffer unit for weighing sampling data. This buffer unit is used to store the weighing sampling data that needs to be processed. A memory cell of length M is allocated by the microprocessor as a differential unit for weighing sampling data. This unit is used to store the change value ΔW of the weighing sampling data at an interval of ΔT. The change values ​​ΔW1, ΔW2, ΔW3, ..., ΔW3 of multiple weighing sampling data are obtained. M .

7. The method according to claim 1, characterized in that: Set the maximum limit W for the change in weighing sample data. L Let t1 be the time before the weight mutation occurs and t2 be the time after the weight mutation disappears. Then, determine whether the absolute value of the change in the obtained weighing sample data is less than the maximum limit value W of the change in the weighing sample data. L ; Multiple curve fittings were performed on N1 weight data points prior to the weight mutation at time t1, and the goodness-of-fit R-value was used to determine the results. 2 The value and the amount of non-mutation data are determined by t. s Time, and t s Equation W of the remaining liquid weight curve before time point s (t); Multiple curve fittings were performed on N2 weight data points prior to the weight mutation at time t2, and the goodness-of-fit R-value was used to determine the results. 2 The value and the amount of non-mutation data are determined by t. e Time, and t e Equation W of the remaining liquid weight curve before time point e (t).

8. The method according to claim 7, characterized in that: Determine t s W s (t), t e W e (t), find t s Infusion rate v(t) at time t s ) and t e Infusion rate v(t) at time t e ); Estimate (t) s ,t e The infusion volume at any given time; Based on W s (t s W e (t e ) and estimate (t s ,t e ) Calculate the infusion volume at time t during the infusion process. s ,t e Add liquid weight W at regular intervals.

9. A system for calculating the weight of fluid added during intravenous infusion, characterized in that, This system is applied to a method for calculating the weight of fluid added during infusion as described in any one of claims 1 to 8, the system comprising: Infusion weighing assembly, infusion monitoring workstation, infusion pump, syringe pump, waste liquid weighing assembly and trolley support frame.

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