Accurate urine metering device and method

Abstract

The invention belongs to the technical field of medical instruments, and particularly relates to an accurate urine metering device and a method thereof.The accurate urine metering device comprises a first urine container and a second urine container which are communicated with each other, a peristaltic pump is arranged on a communication road of the first urine container and the second urine container, and a first connecting pipe communicated with the first urine container is arranged on the surface of the first urine container; the free end of the first connecting pipe is communicated with the catheter, an air pressure sensor and an exhaust port are arranged at the top end of the first urine container, a first electromagnetic valve is arranged in the exhaust port, an exhaust port is formed in the top end of the second urine container, and a second electromagnetic valve is arranged in the exhaust port; the first urine container and the second urine container are each internally provided with a detection module for monitoring the amount of urine in the first urine container and the second urine container, and the detection modules, the first electromagnetic valve, the second electromagnetic valve and the peristaltic pump are jointly and electrically connected with a control unit. And the final measurement result is not accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to an accurate urine metering device and method thereof. Background Art

[0002] Precisely measuring the urine of patients plays an important role in clinical nursing and medical diagnosis, mainly reflected in the following aspects: (1) Urine volume is a key indicator reflecting the filtration function of the kidneys and fluid balance. Combining data such as urine specific gravity and osmotic pressure can further judge the concentrating and diluting functions of the kidneys, and then evaluate the renal function status; (2) Precisely recording urine volume helps to evaluate the fluid status of patients; (3) Diagnosing metabolic or endocrine diseases; (4) Monitoring drug efficacy and toxicity, etc. Therefore, accurate urine metering can provide key evidence for diagnosis and treatment in patients with critical illnesses, abnormal renal function, or high fluid management requirements. Medical staff need to comprehensively judge by combining other indicators (such as blood pressure, laboratory tests). For example, a Chinese patent discloses a method, device, system, and medium for automatic urine bag metering (patent publication number: CN116899034A). By controlling based on an intelligent urine bag device, a communication link is established based on the intelligent urine bag device to send a first control instruction to a control board. The control board executes the urine transfer process according to the first control instruction. After each execution of the urine transfer process, a first feedback result is generated. By counting the number of times the first feedback result appears within a set period, the urine volume within the set period is calculated, effectively improving the automation level of urine bag metering.

[0003] Although the above technical solution provides an automatic urine metering device, during the use process, there will be losses during urine transfer, resulting in errors in the measurement process. However, the above technical solution does not compensate for this error of loss, resulting in inaccurate final measurement results. The more urine is collected in the urine bag, the greater the cumulative error will be, affecting the final measurement result and posing a potential hazard to doctors' diagnosis. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an accurate urine metering device and method thereof, which are used to solve the problem that the existing urine metering device has errors during the detection process, resulting in inaccurate final measurement results.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An accurate urine metering device includes a first urine container and a second urine container that are interconnected. A peristaltic pump is provided on the communication path between the first urine container and the second urine container. A first connecting pipe connected to the first urine container is provided on the surface of the first urine container, and the free end of the first connecting pipe is connected to a catheter. A pressure sensor and an exhaust port are provided at the top of the first urine container, and a first solenoid valve is provided in the exhaust port. An exhaust port is also opened at the top of the second urine container, and a second solenoid valve is provided in the exhaust port. Detection modules for real-time monitoring of the urine volume inside are respectively provided in the first urine container and the second urine container. The detection module, the first solenoid valve, the second solenoid valve, and the peristaltic pump are commonly electrically connected to a control unit.

[0007] Further, a through hole communicating with the first connecting pipe is opened at the top of the first urine container. An activity shell moving vertically is slidably connected inside the first urine container. The activity shell is horizontally arranged, and a liquid storage tank corresponding to the through hole is opened on the upper surface of the activity shell. A liquid outlet communicating with the liquid storage tank is opened at the bottom end of the activity shell, and a third solenoid valve is provided at the liquid outlet. The bottom of the liquid storage tank is gradually inclined downward towards the liquid outlet. An elastic shell is commonly connected between the upper end surface of the activity shell and the inner wall of the upper end of the first urine container. The elastic shell, a part of the surface of the liquid storage tank, and a part of the inner wall of the first urine container jointly form a urine storage chamber. The urine storage chamber communicates with the through hole. The third solenoid valve is electrically connected to the control unit.

[0008] Further, a plurality of filters spaced from each other vertically are provided in the liquid storage tank. Each filter is horizontally arranged, and the aperture of each filter gradually decreases from top to bottom in the vertical direction to filter the passing urine.

[0009] Further, the lower end surfaces of the first urine container and the second urine container are both in a conical shape protruding outward. A second connecting pipe is connected between the lower end surface of the first urine container and the lower end surface of the second urine container. The peristaltic pump is arranged on the path of the second connecting pipe. A reversing valve is also provided on the path of the second connecting pipe, and the reversing valve is arranged between the peristaltic pump and the first urine container. A third connecting pipe is connected to the top of the first urine container. One end of the third connecting pipe communicates with the urine storage chamber, and the other end communicates with the reversing valve. The reversing valve is electrically connected to the control unit.

[0010] Further, the detection module includes a pressure sensor provided in the first urine container and an ultrasonic liquid level sensor provided in the second urine container.

[0011] Further, an accurate urine metering method is applied in an accurate urine metering device, including the following steps.

[0012] Step 1: The patient's urine enters the first urine container successively through the catheter and the first connecting tube, and then stands still in the first urine container for a period of time to eliminate the foam in the urine;

[0013] Step 2: Calculate the volume V1 of the standing urine in the first urine container through the detection module in the first urine container, then control the peristaltic pump to transfer the standing urine in the first urine container to the second urine container, and record the transfer pulse number P1. Then stand still for another period of time, and calculate the volume V2 of the standing urine through the detection module in the second urine container;

[0014] Step 3: Perform at least two urine bidirectional transfer operations, and record the volume data sequences {V1, V2…V n} and {P1, P2…P n}, calculate the measurement error according to the volume data, and establish the correction relationship between the pulse number and the volume;

[0015] Step 4: If the deviation between two adjacent measurement values exceeds the preset threshold, trigger an alarm. Otherwise, apply the correction relationship to compensate for the error and output the final urine volume value.

[0016] Further, in step S3, establishing the correction relationship between the pulse number and the volume includes the following steps,

[0017] Step 3.1: Establish the mapping relationship between the pulse number P and the actual volume V through the following second-order polynomial:

[0018] V(P) = αP 2 +βP + γ

[0019] where α, β, γ are fitting coefficients, calibrated through experimental data; the pulse number P is the cumulative step motor drive pulse number of the peristaltic pump when transferring urine; the volume V is the actual measured volume of urine in the corresponding container;

[0020] Step 3.2: To reduce the noise impact of early transfer data, use the least squares fitting with exponentially decaying weights:

[0021]

[0022] where the weight ω i decreases in order of transfer:

[0023]

[0024] where λ is the decay coefficient, and i is the transfer order number (i = 1, 2,..., n);

[0025] Step 3.3: Real-time error compensation. During the measurement stage, according to the current pulse number P k , calculate the volume compensation value V补 :

[0026] V 补 = V m + δ·[V(P k ) - V m

[0027] where V m is the actually measured volume of the current sensor, δ is the compensation intensity factor, and V(P k ) is the volume value predicted according to the model;

[0028] Step 3.4, the system model performs the following updates periodically after running for a period of time:

[0029] Data screening: Eliminate the abnormal points that satisfy (σ is the standard deviation);

[0030] Parameter refitting: Recalculate α, β, γ with the latest data;

[0031] Health detection: If the residual triggers the pump tube maintenance alarm.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1. The present invention transfers the collected urine through the interconnected first urine container and second urine container, and uses two sensors to detect the urine volume multiple times to eliminate the detection error of a single sensor, improve the accuracy during urine measurement, and set multiple filters with different pore sizes in the first urine container to eliminate the foam in the urine, effectively reducing the error during measurement; meanwhile, by setting an elastic shell in the first urine container to temporarily hold the urine, it can reduce the interference during the urine measurement process and improve the stability during the urine volume detection process;

[0034] 2. During the detection process of the urine volume, by establishing the correction relationship between the pulse number and the volume, the measurement error caused by the peristaltic pump is effectively reduced, and combined with the weight decay design, the problem of unstable volume data during the early urine transfer is solved, which can further improve the accuracy during the urine volume detection, and can perform dynamic compensation according to the wear degree of the peristaltic pump tube, realizing the precision and intelligence of urine metering, providing reliable data support for clinical decision-making, and effectively solving the problems of bubble interference, pump tube aging error, and inability to continuously monitor existing in traditional urine metering.

[0035] ​Other advantages, objects and features of the present invention will be set forth in the following description, and to some extent will be obvious to those skilled in the art, or those skilled in the art can be taught from the practice of the present invention. The objects and other advantages of the present invention can be achieved and obtained through the following description. Brief Description of the Drawings

[0036] In order to make the objects, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0037] Figure 1 Schematic diagram of the connection between the first urine container and the second urine container of the present invention;

[0038] Figure 2 Schematic diagram of the internal structure of the first urine container of the present invention;

[0039] Figure 3 Flow chart of the urine metering method of the present invention.

[0040] The reference numerals in the drawings are as follows:

[0041] 1 First urine container, 2 Second urine container, 3 Peristaltic pump, 4 First connecting pipe, 5 Air pressure sensor, 6 First solenoid valve, 7 Second solenoid valve, 8 Movable housing, 9 Third solenoid valve, 10 Elastic housing, 11 Filter screen, 12 Second connecting pipe, 13 Directional valve, 14 Third connecting pipe. Detailed Description of the Embodiments

[0042] As Figures 1 to 3 shown,

[0043] An accurate urine metering device includes a first urine container 1 and a second urine container 2 that are interconnected. A peristaltic pump 3 is provided on the communication path between the first urine container 1 and the second urine container 2. A first connecting pipe 4 communicating with the first urine container 1 is provided on the surface of the first urine container 1, and the free end of the first connecting pipe 4 is connected to a catheter (the catheter is not shown in the figure), and the catheter is connected to the patient's bladder. An air pressure sensor 5 and an exhaust port are provided at the top of the first urine container 1, and a first solenoid valve 6 is provided in the exhaust port. An exhaust port is also opened at the top of the second urine container 2, and a second solenoid valve 7 is provided in the exhaust port. Detection modules for real-time monitoring of the urine volume inside are respectively provided in the first urine container 1 and the second urine container 2. The detection modules, the first solenoid valve 6, the second solenoid valve 7, and the peristaltic pump 3 are commonly electrically connected to a control unit.

[0044] As shown in the figure, the patient's urine enters the first urine container 1 through the catheter and the first connecting tube 4. After the urine in the first urine container 1 stands for a period of time, the foam in the urine will gradually decrease. At this time, the detection module in the first urine container 1 detects the volume of the urine and transmits the measured result to the control unit; when the detection module in the first urine container 1 finishes measuring, the peristaltic pump 3 transfers all the urine in the first urine container 1 to the second urine container 2. The detection module in the second urine container 2 conducts a second volume detection on the transferred urine container and transmits the measured result to the control unit. The control unit analyzes the urine volumes detected twice according to the preset program and outputs the value closest to the true urine volume for medical staff to refer to; among them, when urine enters the first urine container 1 or the second urine container 2, to prevent measurement errors caused by unbalanced internal pressure differences, through the cooperation of the air pressure sensor 5, the first electromagnetic valve 6, and the second electromagnetic valve 7, the connection or closure between the first urine container 1, the second urine container 2 and the outside can be adjusted in real time, ensuring the pressure balance in the first urine container 1 and the second urine container 2.

[0045] In this embodiment, a through hole communicating with the first connecting tube 4 is provided at the top end of the first urine container 1. An activity housing 8 moving vertically is slidably connected inside the first urine container 1. The activity housing 8 is horizontally arranged, and a liquid storage tank corresponding to the through hole is provided on the upper surface of the activity housing 8. An outlet is provided at the bottom end of the activity housing 8 and communicates with the liquid storage tank, and a third electromagnetic valve 9 is provided at the outlet. The bottom of the liquid storage tank is gradually inclined downward toward the outlet. A flexible housing 10 is fixedly connected between the upper end surface of the activity housing 8 and the inner wall of the upper end of the first urine container 1. The flexible housing 10 is made of a corrugated pipe, and the flexible housing 10, a part of the surface of the liquid storage tank, and a part of the inner wall of the first urine container 1 together form a urine storage chamber. The urine storage chamber communicates with the through hole and the exhaust port at the top end of the first urine container 1. The third electromagnetic valve 9 is electrically connected to the control unit.

[0046] As shown in the figure, under normal circumstances, the liquid outlet on the elastic housing 10 is in an open state. After the patient's urine enters the first urine container 1, it will pass through the elastic housing 10 and enter the inside of the first urine container 1 to stand still for a period of time. To prevent new urine from coming in and affecting the previously standing urine, the control unit will control the third solenoid valve 9 to close the liquid outlet at the bottom of the movable housing 8, so that the urine storage chamber temporarily stores the newly entered urine. When the previously standing urine has been placed for the specified time, the peristaltic pump 3 transfers all the urine to the second urine container 2, and then the control unit opens the liquid outlet of the third solenoid valve 9, so that the urine in the urine storage chamber enters the first urine container 1 and stands still for a period of time, and then is transferred to the second urine container 2 through the peristaltic pump 3; through the cooperation of components such as the urine storage chamber and the third solenoid valve 9, it can effectively solve the problem that the addition of new urine will affect the measurement result during the measurement of urine volume, and improve the accuracy of the measurement result; among them, since the elastic housing 10 is made of a corrugated pipe, when the newly generated urine of the patient enters the urine storage chamber, the movable housing will move downward under the action of the urine weight. At this time, the elastic housing 10 will also extend downward by a certain distance, effectively expanding the storage volume in the urine storage chamber and being able to store more urine. When the liquid outlet of the urine storage chamber is opened, the urine inside will enter the first urine container 1 through the liquid outlet, and then the elastic housing 10 will reset under its own elastic action. When the elastic housing 10 extends downward and gradually occupies the space inside the first urine container 1, if the urine standing in the first urine container 1 is about to contact the bottom end surface of the movable housing 8, the control unit can start the peristaltic pump 3 to transfer the urine in the first urine container 1 to the second urine container 2, which can prevent the movable housing 8 from disturbing the previously standing urine and can also provide sufficient space for the gradually expanding urine storage chamber.

[0047] In this embodiment, a plurality of filters 11 spaced apart from each other vertically are provided in the liquid storage tank. Among them, each filter 11 is horizontally arranged, and the pore diameter of each filter 11 gradually decreases from top to bottom in the vertical direction. The upper layer uses a 100μm stainless steel sintered mesh (to intercept large bubbles), the middle layer uses a 20μm hydrophilic PTFE membrane (to break medium bubbles), and the lower layer uses a 3μm hydrophobic membrane (to block micro bubbles), and filters the passing urine.

[0048] As shown in the figure, the filters 11 with different pore diameters can effectively filter the foam in the urine, greatly saving the time wasted by using the static method to eliminate the foam, and thus accelerating the efficiency of measuring the urine volume.

[0049] In this embodiment, the lower end faces of the first urine container 1 and the second urine container 2 are both in a conical shape protruding outward, and a second connecting pipe 12 is connected between the lower end face of the first urine container 1 and the lower end face of the second urine container 2. The peristaltic pump 3 is arranged on the passage of the second connecting pipe 12. A reversing valve 13 is also arranged on the passage of the second connecting pipe 12. The reversing valve 13 adopts a three-way two-position valve, and the reversing valve 13 is arranged between the peristaltic pump 3 and the first urine container 1. The top end of the first urine container 1 is connected with a third connecting pipe 14. One end of the third connecting pipe 14 is communicated with the liquid storage chamber, and the other end is communicated with the reversing valve 13. The reversing valve 13 is electrically connected with the control unit.

[0050] As shown in the figure, when all the urine in the first urine container 1 is transferred to the second urine container 2, in order to further eliminate the foam in the urine and improve the measurement accuracy, the control unit controls the peristaltic pump 3 again to transfer all the urine in the second urine container 2 to the first urine container 1. At this time, the control unit controls the reversing valve 13 so that the urine in the second urine container 2 first enters the urine storage chamber through the third connecting pipe 14 and is filtered through three layers of filter screens in sequence, and then enters the first urine container 1; conversely, when the peristaltic pump 3 transfers the urine in the first urine container 1 to the second urine container 2, the reversing valve 13 is controlled so that the first urine container 1 and the second urine container 2 are communicated with each other through the second connecting pipe 12.

[0051] In this embodiment, the detection module includes a pressure sensor arranged in the first urine container 1 and an ultrasonic liquid level sensor arranged in the second urine container 2. Two different types of sensors can effectively measure the urine volume accurately.

[0052] An accurate urine metering method is applied to the accurate urine metering device described above, and includes the following steps.

[0053] Step 1: The urine of the patient enters the first urine container 1 through the catheter and the first connecting pipe 4 in sequence, and then stands in the first urine container 1 for a period of time to eliminate the foam in the urine. Although the urine will be filtered through the filter screen 11 when entering the first urine container 1, the urine will still be disturbed after falling, generating small bubbles. Therefore, standing for a period of time will reduce the measurement error.

[0054] Step 2: Calculate the volume V1 of the urine after standing through the detection module in the first urine container 1, then control the peristaltic pump 3 to transfer the urine after standing in the first urine container 1 to the second urine container 2, and record the transfer pulse number P1. Then stand for a period of time again, and calculate the volume V2 of the urine after standing through the detection module in the second urine container 2.

[0055] Step 3. Perform the urine two-way transfer operation at least twice, and record the volume data sequences {V1, V2…V n} and {P1, P2…P n}, calculate the measurement error based on the volume data, and establish a correction relationship between the pulse number and volume to eliminate systematic errors and compensate for the delivery volume deviation caused by factors such as wear of the pipeline of the peristaltic pump 3, changes in liquid viscosity, and fluctuations in pipeline resistance;

[0056] Step 4. If the deviation between two adjacent measurement values exceeds 5%, trigger an alarm; otherwise, apply the correction relationship to compensate for the error and output the final urine volume value. Among them, the newly produced urine of the patient is temporarily stored in the urine storage chamber during the measurement period and then put into the first urine container 1 after the current cycle is completed.

[0057] In this embodiment, in step S3, establishing the correction relationship between the pulse number and volume includes the following steps.

[0058] Step 3.1. Establish a mapping relationship between the pulse number P and the actual volume V through the following second-order polynomial:

[0059] V(P) = αP 2 +βP + γ

[0060] where α, β, γ are fitting coefficients, calibrated by the following experimental data:

[0061]

[0062] The pulse number P is the cumulative number of stepping motor drive pulses of the peristaltic pump 3 during urine transfer; the volume V is the actual measured volume of urine in the corresponding container (capacity data obtained by the detection module);

[0063] Step 3.2. To reduce the noise impact of early transfer data, use the least squares fitting with exponentially decaying weights:

[0064]

[0065] where the weight ω i decreases in the order of transfer:

[0066]

[0067] where λ is the decay coefficient (preferred value 0.3 - 0.7), and i is the transfer order number (i = 1, 2,..., n);

[0068] Step 3.3. Real-time error compensation. During the measurement stage, calculate the volume compensation value V k according to the current pulse number P 补 :

[0069] V补 = V m + δ·[V(P k ) - V m

[0070] Among them, V m is the actually measured volume of the current sensor, δ is the compensation intensity factor (default 0.7, adjustable range is 0.3 - 0.9), and V(P k ) is the volume value predicted according to the model;

[0071] Calculation of the finally output urine volume value:

[0072]

[0073] Among them, the weight w k = e -0.2k (exponential decay, higher weight for recent data), V k represents the actually measured volume after the k-th transfer,

[0074] Exponential function (retain data when meeting the 5% deviation condition of Claim 1):

[0075]

[0076] To further explain the calculation steps of the final urine, an example is given as follows:

[0077]

[0078] · The parameters α = 0.0001, β = 0.019, γ = -0.2 are calculated through the fitting model;

[0079] · Calculate the volume compensation value at each transfer respectively:

[0080] V 补1 = 0.7×10.18 + 0.3×10.2 = 10.19

[0081] V 补2 = 0.7×9.82 + 0.3×9.8 = 9.81

[0082] V 补3 = 0.7×10.21 + 0.3×10.3 = 10.24

[0083] · Check the deviation:

[0084] ∣10.3 - 9.8∣ = 0.5 > 5%×9.8 ∣10.3 - 9.8∣ = 0.5 > 5%×9.8 → Trigger an alarm.

[0085] · If there is no abnormality, calculate and output the urine volume value: ​

[0086] The weight w1 = e -0.2 = 0.819, w2 = 0.670, w3 = 0.549

[0087]

[0088] Among them, if new urine comes in during the process of transferring urine, the newly incoming urine can be temporarily stored in the urine storage chamber. After the previous urine transfer and measurement work are completed, the urine in the urine storage chamber is then transferred to the first urine container 1, and then the urine transfer and measurement work are repeated to calculate the accurate volume value of the total urine.

[0089] Step 3.4, the system model (pulse number - volume correction relationship model) is periodically executed for the following updates every 24 hours:

[0090] Data screening: Eliminate the outliers that satisfy (σ is the standard deviation, V i represents the urine volume actually measured by the sensor during the i-th urine transfer);

[0091] Parameter refitting: Recalculate α, β, γ with the latest data;

[0092] Health detection: If the residual triggers the pump tube maintenance alarm, medical staff are required to replace the pipeline of the peristaltic pump 3 to avoid the increase of measurement error caused by pipeline aging (the residual ∈ represents the deviation between the measured volume and the model predicted volume, V(P i ) refers to the predicted volume calculated by the model according to the current pulse number P i ).

[0093] Among them, by updating the system model, the measurement accuracy and system reliability can be effectively guaranteed. Because after long-term use, the peristaltic pump tube will have physical changes such as elastic fatigue and inner diameter expansion, resulting in the drift of the pulse number - volume relationship (experiments show that the single-pulse delivery volume decreases by 15% after 200 hours). By periodically refitting the coefficients (especially β), the error caused by the performance attenuation of the pump tube can be corrected in real time; secondly, the urine viscosities and bubble contents of different patients or the same patient at different times are different, affecting the delivery efficiency. Dynamically adjust the model parameters, such as automatically increasing the absolute value of α under high-viscosity urine to compensate for the non-linear effect; finally, due to temperature changes, the peristaltic pump pipeline expands / contracts (for example, when ΔT = 10 °C, the inner diameter of the PVC pump tube changes by 0.3%). Through the update of the γ term, the zero drift caused by thermal expansion and contraction can be effectively eliminated, and the environmental interference can be corrected, ultimately improving the accuracy of urine measurement.

[0094] Through the compensation of the system model, the replacement cycle of the peristaltic pump tube is greatly extended, and automatic update replaces manual calibration, reducing the operation steps and work burden of nurses.

[0095] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. An accurate urine metering device, comprising a first urine container (1) and a second urine container (2) that are interconnected, characterized in that: A peristaltic pump (3) is provided on the communication path between the first urine container (1) and the second urine container (2). A first connecting pipe (4) connected to the first urine container (1) is provided on the surface of the first urine container (1), and the free end of the first connecting pipe (4) is communicated with a urinary catheter. A pressure sensor (5) and an exhaust port are provided at the top end of the first urine container (1), and a first electromagnetic valve (6) is provided in the exhaust port. An exhaust port is also opened at the top end of the second urine container (2), and a second electromagnetic valve (7) is provided in the exhaust port. Detection modules for real-time monitoring of the urine volume inside are respectively provided in the first urine container (1) and the second urine container (2). The detection module, the first electromagnetic valve (6), the second electromagnetic valve (7), and the peristaltic pump (3) are commonly electrically connected to a control unit.

2. The precise urine metering device according to claim 1, characterized in that: A through hole communicated with the first connecting pipe (4) is opened at the top end of the first urine container (1). An activity shell (8) moving vertically is slidably connected inside the first urine container (1). The activity shell (8) is horizontally arranged, and a liquid storage tank corresponding to the through hole is opened on the upper surface of the activity shell (8). A liquid outlet communicated with the liquid storage tank is opened at the bottom end of the activity shell (8), and a third electromagnetic valve (9) is provided at the liquid outlet. The bottom of the liquid storage tank is gradually inclined downward towards the liquid outlet. An elastic shell (10) is commonly connected between the upper end surface of the activity shell (8) and the inner wall of the upper end of the first urine container (1). The elastic shell (10), a part of the surface of the liquid storage tank, and a part of the inner wall of the first urine container (1) jointly form a urine storage chamber. The urine storage chamber is communicated with the through hole. The third electromagnetic valve (9) is electrically connected to the control unit.

3. The precise urine metering device according to claim 2, wherein: A plurality of filters (11) spaced from each other vertically are provided in the liquid storage tank. Each of the filters (11) is horizontally arranged, and the aperture of each filter (11) gradually decreases from top to bottom in the vertical direction to filter the passing urine.

4. The precise urine metering device according to claim 3, characterized in that: The lower end surfaces of the first urine container (1) and the second urine container (2) are both in a conical shape protruding outward. A second connecting pipe (12) is communicated between the lower end surface of the first urine container (1) and the lower end surface of the second urine container (2). The peristaltic pump (3) is arranged on the path of the second connecting pipe (12). A reversing valve (13) is also provided on the path of the second connecting pipe (12), and the reversing valve (13) is arranged between the peristaltic pump (3) and the first urine container (1). A third connecting pipe (14) is connected to the top end of the first urine container (1). One end of the third connecting pipe (14) is communicated with the urine storage chamber, and the other end is communicated with the reversing valve (13). The reversing valve (13) is electrically connected to the control unit.

5. The precise urine metering device according to claim 4, characterized in that: The detection module includes a pressure sensor provided in the first urine container (1) and an ultrasonic liquid level sensor provided in the second urine container (2).

6. A precise urine metering method, applied to a precise urine metering device as described in claims 1 to 5, characterized in that: Including the following steps, Step 1: The urine of the patient sequentially enters the first urine container (1) through the urinary catheter and the first connecting pipe, and then stands in the first urine container (1) for a period of time to eliminate the foam in the urine; Step 2: Calculate the volume V1 of the urine after standing through the detection module in the first urine container (1). Subsequently, control the peristaltic pump (3) to transfer the urine after standing in the first urine container (1) to the second urine container (2), and record the transfer pulse number P1. Then stand for another period of time, and calculate the volume V2 of the urine after standing through the detection module in the second urine container (2). Step 3: Perform at least two urine bidirectional transfer operations, and record the volume data sequences {V1, V2…V n} and {P1, P2…P n}, calculate the measurement error based on the volume data, and establish the correction relationship between the pulse number and the volume; Step 4: If the deviation between two adjacent measurement values exceeds the preset threshold, trigger an alarm. Otherwise, apply the correction relationship to compensate for the error and output the final urine volume value.

7. The precise urine metering method according to claim 6, wherein: In step S3, establishing the correction relationship between the pulse number and the volume includes the following steps Step 3.1: Establish the mapping relationship between the pulse number P and the actual volume V through the following second-order polynomial V(P) = αP 2 + βP + γ where α, β, and γ are fitting coefficients calibrated through experimental data; the pulse number P is the cumulative number of stepping motor drive pulses of the peristaltic pump during urine transfer; the volume V is the actual measured volume of urine in the corresponding container. Step 3.2: To reduce the noise impact of early transfer data, use the least squares fitting with exponential decay weights Among them, the weight ω i Decreases in the order of transfer: where λ is the decay coefficient and i is the transfer number sequence number (i = 1, 2,..., n). Step 3.3, real-time error compensation. During the measurement phase, based on the current pulse count P k , calculate the volume compensation value V 补 : V 补 = V m + δ·[V(P k ) - V m ​ Among them, V m is the actually measured volume of the current sensor, δ is the compensation intensity factor, and V(P k ) is the volume value predicted according to the model; Step 3.4: After the system model runs for a period of time, perform the following updates periodically Data screening: Exclude the outliers that satisfy (where σ is the standard deviation); Parameter refitting: Recalculate α, β, and γ with the latest data Health detection: If the residual triggers the pump tube maintenance alarm.

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