A liquid drive device calibration system and method for a urodynamic analyzer

Abstract

The application discloses a liquid driving device calibration system and method for a urodynamic analyzer, which comprises the following steps: firstly, acquiring a transmission characteristic curve of a test liquid transmitted by a liquid transmission device in the urodynamic analyzer under preset working parameters, wherein the preset working parameters include a power type and a power rotating speed, and the transmission characteristic curve is a corresponding relationship between the power rotating speed and the flow rate of the transmission test liquid; and then, setting transmission parameters of the liquid transmission device in the urodynamic analyzer according to liquid parameters of a to-be-transmitted liquid and a transmission characteristic curve corresponding to the liquid parameters, wherein the transmission parameters include the power rotating speed. Since the transmission characteristic curve is automatically calibrated through actual measurement of the test liquid, the calibration precision of the liquid driving device is higher, and thus the flow rate control of the liquid driving device of the urodynamic analyzer on the transmission liquid is more accurate and reliable.

Description

Technical Field

[0001] This invention relates to the field of urodynamic testing equipment technology, and more specifically to a calibration system and method for a liquid-driven device in a urodynamic analyzer. Background Technology

[0002] A urodynamic analyzer is an instrument that uses fluid dynamics principles to detect and analyze pressure parameters such as bladder pressure, abdominal pressure, and urethral pressure in patients. The typical workflow involves transmitting the patient's bladder pressure, abdominal pressure, and urethral pressure via catheters to various pressure sensors. These sensors acquire this pressure information and convert it into a weak electrical signal. This signal is then amplified by an amplification channel. After being converted into a digital signal by an analog-to-digital converter (A / D), the information and data are processed and output by a computer. The fluid drive devices in a urodynamic analyzer include an infusion pump and a peristaltic pump. When setting the fluid flow rate, the infusion pump must first be calibrated to correspond to the flow rate for each rotation speed, such as 1 revolution / minute = 0.64 ml / minute, 2 revolutions / minute = 1.31 ml / minute, 3 revolutions / minute = 1.93 ml / minute, ..., 350 revolutions / minute = 153.68 ml / minute, etc. Then, the rotation speed corresponding to a certain flow rate is obtained by looking up a table each time it is used. Moreover, the flow rate of the peristaltic pump will have a large deviation after a period of use, and manual calibration with a graduated cylinder is required. However, since the rotation speed and flow rate of the peristaltic pump are non-linear, there is still a large error after calibration. Summary of the Invention

[0003] The main technical problem addressed in this application is how to achieve automatic calibration of the liquid drive device in a urodynamic analyzer.

[0004] According to the first aspect, one embodiment provides a liquid drive device calibration system for a urodynamic analyzer, including a test fluid storage unit, a transmitted fluid measurement unit, a drive transmission curve acquisition unit, and a drive parameter setting unit;

[0005] The test liquid storage unit is used to store test liquids with preset liquid parameters, including concentration, density, temperature and / or viscosity.

[0006] The fluid delivery measurement unit is used to measure the volume and / or mass of the test fluid delivered by the fluid delivery device in the urodynamic analyzer within a preset time period;

[0007] The drive transmission curve acquisition unit is used to acquire the transmission characteristic curve of the liquid transmission device conveying the test liquid under a preset operating parameter; the preset operating parameter includes power type and power speed; the transmission characteristic curve is the curve showing the relationship between the power speed and the flow rate of the test liquid being conveyed.

[0008] The drive parameter setting unit is used to set the transmission parameters of the liquid transmission device in the urodynamic analyzer according to the liquid parameters of the liquid to be transmitted and the transmission characteristic curve corresponding to the liquid parameters; the transmission parameters include the power rotation speed.

[0009] In one embodiment, the drive transmission curve acquisition unit uses an iterative approximation calibration method to obtain the coordinate value of any test point on the transmission characteristic curve, and then connects each test point sequentially according to the horizontal or vertical axis to obtain the transmission characteristic curve; the horizontal axis of any point on the transmission characteristic curve is the flow rate of the liquid transmitted by the liquid drive device, and the vertical axis is the power rotation speed.

[0010] In one embodiment, obtaining the coordinate values ​​of any test point on the transmission characteristic curve using the iterative approximation calibration method includes:

[0011] Step 101: Set the liquid flow rate at the test point to be calibrated as the first calibration flow rate;

[0012] Step 102: Obtain the measured coordinate value of the first measured point; the measured coordinate value of the first measured point is obtained by monitoring the power rotation speed and liquid flow rate when the liquid transmission device actually delivers the test liquid;

[0013] Step 103: Based on the measured coordinate values ​​of the first measured point, apply a preset first transmission characteristic curve formula to calculate the first estimated rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate.

[0014] Step 104: The liquid transfer device is set to the power speed according to the first estimated speed to transfer the test liquid, and the first measured flow rate of the test liquid transferred by the liquid transfer device at the first estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the second measured point; when the first measured flow rate is the same as the first calibration flow rate or the difference is not greater than a preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the second measured point is used as the coordinate value of the test point to be calibrated, that is, the first estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

[0015] Step 105: When the first measured flow rate is not the same as the first calibrated flow rate or the difference between them is greater than the preset first threshold, a preset second transmission characteristic curve formula is applied based on the measured coordinate values ​​of the first measured point and the second measured point to calculate the second estimated rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate.

[0016] Step 106: The liquid transfer device is set to the power speed according to the second estimated speed to transfer the test liquid, and the third measured flow rate of the test liquid transferred by the liquid transfer device at the second estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the third measured point; when the third measured flow rate is the same as the first calibration flow rate or the difference is not greater than the preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the third measured point is used as the coordinate value of the test point to be calibrated, that is, the second estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

[0017] Step 107: When the third measured flow rate is the same as the first calibrated flow rate or the difference between them is greater than the preset first threshold, the second transmission characteristic curve formula is applied to the measured coordinate values ​​of the two measured points closest to the first calibrated flow rate to estimate the iterative predicted rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate.

[0018] Step 108: The liquid transfer device is set to the power speed according to the iterative estimated speed to transfer the test liquid, and the iterative measured flow rate of the test liquid transferred by the liquid transfer device at the iterative estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the iterative measured point; when the iterative measured flow rate is the same as the first calibration flow rate or the difference is not greater than the preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the iterative measured point is used as the coordinate value of the test point to be calibrated, that is, the iterative estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

[0019] Step 109: When the iterative measured flow rate is the same as the first calibrated flow rate or the difference between them is greater than the preset first threshold, repeat steps 107 to 108 until the iterative measured flow rate is the same as the first calibrated flow rate or the difference between them is not greater than the preset first threshold.

[0020] In one embodiment, the formulas for the preset first transmission characteristic curve and / or the preset second transmission characteristic curve are as follows:

[0021] y = kx + a;

[0022] Where a and k are preset constants, x is the actual flow rate of the liquid being transported, and y is the rotational speed of the power unit.

[0023] In one embodiment, the power type includes a peristaltic pump.

[0024] According to a second aspect, one embodiment provides a method for calibrating a liquid drive device for a urodynamic analyzer, applicable to a liquid drive device calibration system as described in the first aspect, the liquid drive device calibration method comprising:

[0025] Obtain the transfer characteristic curve of a test liquid delivered by the liquid transfer device in the urodynamic analyzer under a preset operating parameter; wherein, the preset operating parameter includes power type and power speed, the power type includes a peristaltic pump, and the transfer characteristic curve is the correspondence between the power speed and the flow rate of the test liquid;

[0026] The transmission parameters of the liquid transfer device in the urodynamic analyzer are set according to the liquid parameters of the liquid to be transferred and the corresponding transfer characteristic curve. The transmission parameters include the power rotation speed. The liquid parameters include concentration, density, temperature and / or viscosity.

[0027] Different transfer characteristic curves are set according to different liquid parameters of the test liquid;

[0028] When the liquid transfer device delivers the test liquid, pressure is applied to the test liquid during delivery to simulate the hydraulic changes that occur when the liquid transfer device delivers the liquid.

[0029] According to a third aspect, one embodiment provides a computer-readable storage medium storing a program that can be executed by a processor to implement the liquid drive device calibration method as described in the second aspect.

[0030] The liquid drive device calibration system according to the above embodiment automatically calibrates the transmission characteristic curve by measuring the test liquid, ensuring higher accuracy in calibrating the liquid drive device. This makes the flow rate control of the liquid drive device of the urodynamic analyzer more precise and reliable. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structural framework of a liquid-driven device calibration system in one embodiment;

[0032] Figure 2 This is a flowchart illustrating the iterative approximation calibration method in one embodiment;

[0033] Figure 3 This is a schematic diagram of the coordinates of the first measured point selected in one embodiment;

[0034] Figure 4 This is a schematic diagram of the coordinates obtained from the first estimated rotational speed in one embodiment;

[0035] Figure 5 This is a schematic diagram of coordinates obtained from the second estimated rotational speed in one embodiment;

[0036] Figure 6 This is a schematic diagram of coordinates obtained by iteratively estimating the rotational speed in one embodiment;

[0037] Figure 7 This is a schematic diagram of coordinates repeatedly obtained through iterative estimation of rotational speed in one embodiment;

[0038] Figure 8 This is a flowchart illustrating a calibration method for a liquid-driven device in one embodiment. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0040] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0041] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0042] Urodynamic analyzers utilize fluid-driven devices such as peristaltic pumps and injection pumps. In practical applications, these two types of power-driven devices require regular calibration; otherwise, the accuracy of patient examinations cannot be guaranteed. Peristaltic pumps, in particular, exhibit a relatively linear relationship with flow rate at low speeds, but become highly unstable at medium or higher speeds and are greatly affected by environmental factors. The calibrated flow rate may differ significantly from the actual flow rate, making it impossible to correct using standard calibration coefficients. Furthermore, the delivery flow rate varies when the fluid-driven device delivers fluids with different parameters, compromising the accuracy of the urodynamic analyzer's data.

[0043] Example 1:

[0044] Please refer to Figure 1 This is a schematic diagram of the structural framework of a liquid drive device calibration system in one embodiment. The liquid drive device calibration system is used to calibrate the liquid drive device of a urodynamic analyzer, and includes a test liquid storage unit 10, a transferred liquid measurement unit 20, a drive transmission curve acquisition unit 30, and a drive parameter setting unit 40. The test liquid storage unit 10 stores test liquids with preset liquid parameters, including concentration, density, temperature, and / or viscosity. The transferred liquid measurement unit 20 measures the volume and / or mass of test liquid transported by the liquid transport device in the urodynamic analyzer within a preset time period. The drive transmission curve acquisition unit 30 acquires the transmission characteristic curve of the liquid transport device transporting the test liquid under preset operating parameters. The preset operating parameters include power type and power speed, and the transmission characteristic curve is a curve showing the relationship between power speed and the flow rate of the transported test liquid. The power type of the liquid transport device includes a peristaltic pump. The drive parameter setting unit 40 sets the transmission parameters of the liquid transport device in the urodynamic analyzer based on the liquid parameters of the liquid to be transported and the corresponding transmission characteristic curve. The transmission parameters include power speed.

[0045] In one embodiment, the drive transmission curve acquisition unit 30 uses an iterative approximation calibration method to obtain the coordinate value of any test point on the transmission characteristic curve, and then connects each test point in sequence according to the horizontal or vertical axis to obtain the transmission characteristic curve. The horizontal axis of any point on the transmission characteristic curve is the flow rate of the liquid transmitted by the liquid drive device, and the vertical axis is the power rotation speed.

[0046] Please refer to Figure 2 The diagram below illustrates the flowchart of an iterative approximation calibration method in one embodiment. In one embodiment, the specific steps of the iterative approximation calibration method include:

[0047] Step 101: Select test points.

[0048] The flow rate of the liquid at a test point to be calibrated is set as the first calibration flow rate. Because the accuracy of the flow rate of the liquid delivered by the liquid delivery device is of paramount importance during the use of a urodynamic analyzer, the test point is calibrated based on the flow rate. In this embodiment, to facilitate understanding of the implementation of this iterative approximation calibration method, the first calibration flow rate is set to 50 ml / min. This first calibration flow rate can also be set as needed according to actual requirements.

[0049] Step 102, first actual test.

[0050] The measured coordinates of the first measured point are obtained by monitoring the rotational speed and flow rate of the liquid during actual delivery of the test liquid by the liquid transfer device. Specifically, the measured coordinates of the first measured point include the first measured rotational speed and the first measured flow rate. Please refer to [reference needed]. Figure 3 This is a schematic diagram of the coordinates of the selected first measurement point in one embodiment. The selection of the first measurement point is preferably close to the first calibrated flow rate value, but it can also be obtained by looking up a table. Specifically, the rotational speed of the liquid drive device of the urodynamic analyzer at a flow rate of 50 ml / min (the value of the first calibrated flow rate) is set as the power rotational speed (first measured rotational speed) of the first measurement point, and the liquid flow rate (first measured flow rate) of the first measurement point is obtained by measurement. When the measured liquid flow rate (first measured flow rate) of the first measurement point corresponding to the power rotational speed obtained by actual measurement is the same as the value of the first calibrated flow rate, or the difference is not greater than a preset first threshold, it indicates that the table lookup is accurate, and no further verification of the first measurement point is needed. When the measured liquid flow rate of the first measurement point corresponding to the power rotational speed obtained by actual measurement is not the same as the value of the first calibrated flow rate, or the difference is greater than a preset first threshold, it indicates that the table lookup is inaccurate, and verification is required, continuing with the following steps.

[0051] Step 103, First estimation.

[0052] Based on the measured coordinates of the first measured point, a preset first transmission characteristic curve formula is applied to calculate the first estimated rotational speed of the power unit when the flow rate of the test liquid transported by the liquid transport device is the first calibrated flow rate. In one embodiment, the preset first transmission characteristic curve formula is y = kx + a; where a and k are preset constants, x is the actual flow rate of the transported liquid, and y is the power rotational speed.

[0053] Please refer to Figure 4 This is a schematic diagram of the coordinates obtained by the first estimated rotational speed in one embodiment. The first estimated point v1 is calculated by the measured coordinate value of the first measured point s (the flow velocity value of the first estimated point v1 is the first calibrated flow velocity).

[0054] Connect the first measured point s (48.07, 74.00) with the zero point. Set the slope k = opposite side ÷ bottom side. According to the first transmission characteristic curve (set the value of constant a to 0), the slope k of the first measured point s is calculated as 74.00 / 48.07 = 1.54. The slope of the first estimated point v1 (50, y) is equal to the slope of the first measured point s, i.e., y / 50 = 1.54, so y = 76.97.

[0055] Therefore, the formula for the rotational speed at the first estimated point v1 is: first measured rotational speed / first measured flow velocity * first calibrated flow velocity.

[0056] That is, the target flow rate at the first predicted point v1 is also the first calibrated flow rate, i.e., 50 ml / min.

[0057] Step 104, second actual test.

[0058] The liquid transfer device transmits the test liquid at a power speed set to a first estimated rotational speed. A second measured flow rate of the test liquid delivered by the liquid transfer device at the first estimated rotational speed is obtained through a liquid transfer measurement unit. This second measured flow rate is used to obtain the coordinates of a second measured point, which includes both the second measured rotational speed and the second measured flow rate. When the second measured flow rate is the same as the first calibrated flow rate, or its difference is not greater than a preset first threshold, the calibration of this test point is completed. The coordinates of the second measured flow rate are then used as the coordinates of this test point, meaning the first estimated rotational speed and the first calibrated flow rate are used as the coordinates of the test point on the transfer characteristic curve.

[0059] Step 105, Second Prediction.

[0060] When the second measured flow rate is different from the first calibrated flow rate, or the difference between them is greater than a preset first threshold, a preset second transmission characteristic curve formula is applied based on the measured coordinate values ​​of the first and second measured points to calculate a second estimated rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate. Please refer to [link to relevant documentation]. Figure 5This is a schematic diagram illustrating the coordinates for obtaining the second estimated rotational speed in one embodiment. We now have a first measured point V1 and a first estimated point s. Since the first estimated point s was actually measured in step 104, both V1 and s are obtained from actual pump testing of the liquid, making them highly reliable. Therefore, based on the data from the first measured point V1 and the second measured point V2 (which is the same as the first estimated point s), the coordinates of the second estimated point r2 are calculated. The preset formula for the second transmission characteristic curve is y = kx + a; where a and k are preset constants, x is the actual flow rate of the transported liquid, and y is the power rotational speed. Knowing the coordinate values ​​of the two sets of measured points (the first measured point V1 and the second measured point V2), substituting them into the equation y = kx + a, we can obtain unique values ​​for the constants k and a, thus obtaining a unique formula for the second transmission characteristic curve. If x is set to the first calibration flow rate (50 ml / min), then the y value (second estimated rotational speed) corresponding to the first calibration flow rate is obtained according to the formula of the unique second transfer characteristic curve.

[0061] Step 106, third actual test.

[0062] The liquid transfer device transmits the test liquid at a power speed set to the second estimated rotational speed. A third measured flow rate of the test liquid delivered by the liquid transfer device at the second estimated rotational speed is obtained through the transmitted liquid measurement unit. This yields the coordinates of the third measured point, which includes both the third measured rotational speed and the third measured flow rate. When the third measured flow rate is the same as the first calibration flow rate, or its difference is not greater than a preset first threshold, the calibration of this test point is completed. The coordinates of the third measured point are then used as the coordinates of this test point, meaning the second estimated rotational speed and the first calibration flow rate are used as the coordinates of this test point on the transmission characteristic curve.

[0063] Step 107, iterative prediction.

[0064] When the third measured flow velocity is the same as the first calibrated flow velocity, or the difference between them is greater than a preset first threshold, the iterative estimated rotational speed of the power unit is calculated using the second transmission characteristic curve formula based on the measured coordinate values ​​of the two measured points closest to the first calibrated flow velocity. This calculation is performed when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow velocity. Please refer to [link to relevant documentation]. Figure 6 This is a schematic diagram of the coordinates obtained by iteratively estimating the rotational speed in one embodiment. Now, there are multiple measured point coordinates obtained through actual measurement. The measured coordinate values ​​of the two measured points closest to the first calibrated flow rate are selected and substituted into the preset second transmission characteristic curve formula y = kx + a to obtain a new second transmission characteristic curve formula. Let x be the first calibrated flow rate (50 ml / min). Then, according to the newly obtained second transmission characteristic curve formula, the y value corresponding to the first calibrated flow rate (iteratively estimating the rotational speed) is obtained.

[0065] Step 108, iterative testing.

[0066] The liquid transfer device is set to a power speed based on the iteratively estimated rotational speed to transfer the test liquid. The measured flow rate of the test liquid transferred by the liquid transfer device at the iteratively estimated rotational speed is obtained through the transferred liquid measurement unit to acquire the coordinate values ​​of the iteratively measured points. When the iteratively measured flow rate is the same as the first calibration flow rate, or its difference is not greater than the preset first threshold, the calibration of this test point is completed, and the coordinate values ​​of the iteratively measured point are used as the coordinate values ​​of this test point to be calibrated. In other words, the iteratively estimated rotational speed and the first calibration flow rate are used as the coordinate values ​​of this test point on the transfer characteristic curve.

[0067] Step 109, repeat the iterative calibration.

[0068] When the iteratively measured flow rate is the same as the first calibrated flow rate, or the difference between them is greater than a preset first threshold, repeat steps 107 to 108 until the iteratively measured flow rate is the same as the first calibrated flow rate, or the difference between them is not greater than the preset first threshold. Please refer to [link to relevant documentation]. Figure 7 This is a schematic diagram of the coordinates obtained by iteratively estimating the rotational speed in one embodiment. In one embodiment, the measured coordinate values ​​of two closest measured points on both sides of the first calibration flow rate are selected and substituted into the preset second transmission characteristic curve formula y = kx + a to obtain a new second transmission characteristic curve formula, thereby ensuring that the y value corresponding to the x value when the first calibration flow rate is between the measured flow rate values ​​of the two selected measured points.

[0069] In this embodiment, the relationship between flow velocity x and rotational speed y is plotted on a coordinate system, and the relationships between points in the coordinate system are determined. First, an initial point, referred to as "initial point s" in this embodiment, is obtained from the "data source" (historically calibrated flow velocity and rotational speed relationships). Then, the actual flow velocity of s is measured. If it deviates significantly from the target flow velocity, the next point is calculated and measured, and this process is repeated until a point close to the target flow velocity is found, and the information (flow velocity and rotational speed) of that point is recorded. In one embodiment, an electronic scale is used to weigh the volume of fluid infused by the peristaltic pump to reduce human measurement errors. In another embodiment, a uroflowmeter from a urodynamic analyzer is used to measure the volume of fluid infused by the peristaltic pump. Since the uroflowmeter uses an electronic scale for measurement, no additional electronic scale is needed. This fluid monitoring method is very suitable for urodynamic systems. In one embodiment, the first measurement point is selected from the historically calibrated fluid flow velocity and power rotational speed relationships, i.e., a preset first calibration speed is selected from the historical data calibrated by the urodynamic analyzer, preferably based on the previous calibration data. By selecting a pre-set first calibration speed from historically calibrated data, the closest value of the power rotation speed to the liquid flow rate at the first calibration speed can be obtained, minimizing the number of repeated iterative calibration measurements and thus improving calibration efficiency. In one embodiment, the first measurement point is selected by finding the point closest to the target flow rate in the system calibration table. If the absolute value of the difference between the flow rate at this point and the target flow rate is less than the "minimum of the closest flow rate", then this point is point s. Otherwise, it cannot be accepted, and the rotation speed corresponding to the target flow rate is calculated using the equation "y = 1.542x + 0.1801" (obtained by fitting data corresponding to flow rates at different rotation speeds) as point s, where x is the target flow rate and y is the rotation speed. Using the iterative approximation calibration method, the required rotation speed for a specified flow rate can be quickly calibrated without the need for tedious calibration of the relationship between rotation speed and flow rate, reducing manual measurement errors and enabling rapid and efficient calibration.

[0070] The liquid drive device calibration system disclosed in this application first obtains the transmission characteristic curve of a test liquid delivered by the liquid transfer device in a urodynamic analyzer under preset operating parameters. The preset operating parameters include the power type and power speed, and the transmission characteristic curve represents the correspondence between the power speed and the flow rate of the delivered test liquid. Then, based on the liquid parameters of the liquid to be transferred and the corresponding transmission characteristic curve, the transmission parameters of the liquid transfer device in the urodynamic analyzer are set. These transmission parameters include the power speed. Because the transmission characteristic curve is automatically calibrated by actual measurement of the test liquid, the calibration accuracy of the liquid drive device is higher, resulting in more precise and reliable control of the flow rate of the delivered liquid by the liquid drive device of the urodynamic analyzer. No manual calibration of all speeds or manual measurement of pump volume is required. In one embodiment, an iterative approximation method is used for calibration, which is more accurate than the traditional linear calibration coefficient extrapolation method. Furthermore, the urodynamic analyzer system is already equipped with a uroflowmeter (electronic scale), eliminating the need for any additional peripherals to achieve fully automatic, high-precision flow rate / speed calibration.

[0071] Please refer to Figure 8 This is a flowchart illustrating a liquid drive device calibration method in one embodiment. Another embodiment of this application discloses a liquid drive device calibration method for use in the liquid drive device calibration system described above. The liquid drive device calibration method includes:

[0072] Step 201: Obtain the transmission characteristic curve.

[0073] The transmission characteristic curve of a test liquid delivered by the liquid transfer device in a urodynamic analyzer is obtained under a preset operating parameter. The preset operating parameters include the power type and the power speed. The power type includes a peristaltic pump. The transmission characteristic curve is the correspondence between the power speed and the flow rate of the test liquid.

[0074] Step 202: Set transmission parameters.

[0075] The transfer parameters of the liquid transfer device in the urodynamic analyzer are set based on the liquid parameters of the liquid to be transferred and the corresponding transfer characteristic curves. These transfer parameters include the power rotation speed. The liquid parameters include concentration, density, temperature, and / or viscosity.

[0076] Step 203: Change the transmission characteristic curve.

[0077] Different transfer characteristic curves are set according to the different liquid parameters of the test liquid.

[0078] Step 204: Simulate hydraulic transfer of test liquid.

[0079] When the liquid transfer device delivers the test liquid, pressure is applied to the liquid during delivery to simulate the hydraulic changes that occur when the liquid transfer device delivers the liquid.

[0080] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments can be implemented by hardware or by computer programs. When all or part of the functions in the above embodiments are implemented by computer programs, the program can be stored in a computer-readable storage medium, which may include: read-only memory, random access memory, disk, optical disk, hard disk, etc., and the program is executed by a computer to achieve the above functions. For example, the program can be stored in the memory of a device, and when the program in the memory is executed by the processor, all or part of the above functions can be achieved. In addition, when all or part of the functions in the above embodiments are implemented by computer programs, the program can also be stored in a server, another computer, disk, optical disk, flash drive, or external hard drive, etc., and can be downloaded or copied to the memory of a local device, or the system of the local device can be updated. When the program in the memory is executed by the processor, all or part of the functions in the above embodiments can be achieved.

[0081] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A calibration system for a liquid-driven device in a urodynamic analyzer, characterized in that, It includes a test liquid storage unit, a transmitted liquid measurement unit, a drive transmission curve acquisition unit, and a drive parameter setting unit; The test liquid storage unit is used to store test liquids with preset liquid parameters, including concentration, density, temperature and / or viscosity. The fluid delivery measurement unit is used to measure the volume and / or mass of the test fluid delivered by the fluid delivery device in the urodynamic analyzer within a preset time period; The drive transmission curve acquisition unit is used to acquire the transmission characteristic curve of the liquid transmission device conveying the test liquid under a preset operating parameter; the preset operating parameter includes power type and power speed; the transmission characteristic curve is the curve showing the relationship between the power speed and the flow rate of the test liquid being conveyed. The drive parameter setting unit is used to set the transmission parameters of the liquid transmission device in the urodynamic analyzer according to the liquid parameters of the liquid to be transmitted and the transmission characteristic curve corresponding to the liquid parameters; the transmission parameters include the power rotation speed; The drive transmission curve acquisition unit uses an iterative approximation calibration method to obtain the coordinate value of any test point on the transmission characteristic curve, and then connects each test point in sequence according to the horizontal or vertical axis to obtain the transmission characteristic curve; the horizontal axis of any point on the transmission characteristic curve is the flow rate of the liquid transmitted by the liquid drive device, and the vertical axis is the power rotation speed. The application of the iterative approximation calibration method to obtain the coordinate values ​​of any test point on the transmission characteristic curve includes: Step 101: Set the liquid flow rate at the test point to be calibrated as the first calibration flow rate; Step 102: Obtain the measured coordinate value of the first measured point; the measured coordinate value of the first measured point is obtained by monitoring the power rotation speed and liquid flow rate when the liquid transmission device actually delivers the test liquid; the measured coordinate value of the first measured point includes the first measured rotation speed and the first measured flow rate; Step 103: Based on the measured coordinates of the first measured point, apply a preset first transmission characteristic curve formula to calculate the first estimated rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate; wherein, the preset first transmission characteristic curve formula is: y = kx + a; Where a and k are preset constants, x is the actual flow rate of the liquid being transported, and y is the power rotation speed; Step 104: The liquid transfer device is set to the power speed according to the first estimated speed to transfer the test liquid, and the second measured flow rate of the test liquid delivered by the liquid transfer device at the first estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the second measured point; the coordinate value of the second measured point includes the second measured speed and the second measured flow rate; when the second measured flow rate is the same as the first calibration flow rate or the difference is not greater than a preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the second measured point is used as the coordinate value of the test point to be calibrated, that is, the first estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

2. The liquid-driven device calibration system as described in claim 1, characterized in that, The method of obtaining the coordinates of any test point on the transmission characteristic curve using the iterative approximation calibration method further includes: Step 105: When the second measured flow rate is not the same as the first calibrated flow rate, or the difference between them is greater than the preset first threshold, a preset second transmission characteristic curve formula is applied to calculate the second estimated rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate, based on the measured coordinate values ​​of the first measured point and the second measured point; wherein, the preset second transmission characteristic curve formula is: y = kx + a; Where a and k are preset constants, x is the actual flow rate of the liquid being transported, and y is the power rotation speed; Step 106: The liquid transfer device is set to the power speed according to the second estimated speed to transfer the test liquid, and the third measured flow rate of the test liquid transferred by the liquid transfer device at the second estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the third measured point; the coordinate value of the third measured point includes the third measured speed and the third measured flow rate; when the third measured flow rate is the same as the first calibration flow rate or the difference is not greater than the preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the third measured point is used as the coordinate value of the test point to be calibrated, that is, the second estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

3. The liquid-driven device calibration system as described in claim 2, characterized in that, The method of obtaining the coordinates of any test point on the transmission characteristic curve using the iterative approximation calibration method further includes: Step 107: When the third measured flow rate is the same as the first calibrated flow rate or the difference between them is greater than the preset first threshold, the second transmission characteristic curve formula is applied to the measured coordinate values ​​of the two measured points closest to the first calibrated flow rate to estimate the iterative predicted rotational speed of the power unit when the flow rate of the test liquid delivered by the liquid transmission device is the first calibrated flow rate. Step 108: The liquid transfer device is set to the power speed according to the iterative estimated speed to transfer the test liquid, and the iterative measured flow rate of the test liquid transferred by the liquid transfer device at the iterative estimated speed is obtained through the transferred liquid measurement unit to obtain the coordinate value of the iterative measured point; when the iterative measured flow rate is the same as the first calibration flow rate or the difference is not greater than the preset first threshold, the calibration of the test point to be calibrated is completed, and the coordinate value of the iterative measured point is used as the coordinate value of the test point to be calibrated, that is, the iterative estimated speed and the first calibration flow rate are used as the coordinate values ​​of the test point on the transfer characteristic curve.

4. The liquid-driven device calibration system as described in claim 3, characterized in that, The method of obtaining the coordinates of any test point on the transmission characteristic curve using the iterative approximation calibration method further includes: Step 109: When the iterative measured flow rate is the same as the first calibrated flow rate or the difference between them is greater than the preset first threshold, repeat steps 107 to 108 until the iterative measured flow rate is the same as the first calibrated flow rate or the difference between them is not greater than the preset first threshold.

5. The liquid-driven device calibration system as described in claim 1, characterized in that, The power type includes peristaltic pumps.

6. A calibration method for a liquid drive device in a urodynamic analyzer, characterized in that, The liquid drive device calibration method, applied to the liquid drive device calibration system as described in any one of claims 1 to 5, comprises: Obtain the transfer characteristic curve of a test liquid delivered by the liquid transfer device in the urodynamic analyzer under a preset operating parameter; wherein, the preset operating parameter includes power type and power speed, the power type includes a peristaltic pump, and the transfer characteristic curve is the correspondence between the power speed and the flow rate of the test liquid; The transmission parameters of the liquid transfer device in the urodynamic analyzer are set according to the liquid parameters of the liquid to be transferred and the corresponding transfer characteristic curve. The transmission parameters include the power rotation speed. The liquid parameters include concentration, density, temperature and / or viscosity. Different transfer characteristic curves are set according to different liquid parameters of the test liquid; When the liquid transfer device delivers the test liquid, pressure is applied to the test liquid during delivery to simulate the hydraulic changes that occur when the liquid transfer device delivers the liquid.

7. A computer-readable storage medium, characterized in that, The medium stores a program that can be executed by a processor to implement the liquid drive device calibration method as described in claim 6.

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