Intracranial pressure probe calibration system

Abstract

The utility model relates to the technical field of probe calibration, and discloses an intracranial pressure probe calibration system which is used for calibrating an intracranial pressure probe, a pressure chip is packaged in the intracranial pressure probe, and the intracranial pressure probe calibration system can comprise a probe detection plate, a current limiter, a three-way valve, a pressure pump, a pressure measuring device and a measuring and displaying device. The intracranial pressure probe is electrically connected with the probe detection plate, a calibration circuit diagram is arranged on the probe detection plate, and the probe detection plate is further connected with the measurement and display device; the head end of the intracranial pressure probe is placed in the current limiter, and the current limiter is connected with a first channel of the three-way valve; a second channel of the three-way valve is connected with the pressure pump. A third channel of the three-way valve is connected with the pressure measuring device. The calibration operation process is simple and can be completed by general production line workers, and the probe calibration time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of probe calibration, in particular to an intracranial pressure probe calibration system. Background Art

[0002] The main difficulty in intracranial pressure monitoring at present is how to calibrate a probe with qualified performance. Most of the existing calibration schemes are complicated to operate, with high labor and time costs. Utility Model Content

[0003] In view of this, the utility model provides an intracranial pressure probe calibration system to solve the problems of most existing calibration solutions being complicated in operation, high in labor cost and time cost.

[0004] The utility model provides an intracranial pressure probe calibration system for calibrating an intracranial pressure probe, wherein the intracranial pressure probe is encapsulated with a pressure chip, and the intracranial pressure probe calibration system comprises: a probe detection board, a flow limiter, a three-way valve, a pressure pump, a pressure measuring device, and a measuring and display device;

[0005] The intracranial pressure probe is electrically connected to the probe detection board, a calibration circuit diagram is arranged on the probe detection board, and the probe detection board is also connected to the measurement and display device;

[0006] The head end of the intracranial pressure probe is placed in the flow limiter, and the flow limiter is connected to the first channel of the three-way valve;

[0007] The second channel of the three-way valve is connected to the pressure pump, and the third channel of the three-way valve is connected to the pressure measuring device.

[0008] In some embodiments, the probe detection board is a tooling board that integrates probe zeroing, calibration, and temperature drift compensation functions.

[0009] In some embodiments, the measuring and display device is an integrated device integrating voltage measurement, resistance measurement, and display functions, and the measuring and display device is used to measure the positive and negative pressure difference of the intracranial pressure probe and the resistance of the intracranial pressure probe.

[0010] In some embodiments, the flow limiter includes a pipeline and a flow limiter connected to the pipeline, and the flow limiter is used to control whether the air pressure inside the pipeline is connected to the atmosphere.

[0011] In some embodiments, the pressure measuring device is used to detect the internal pressure of the pipeline.

[0012] In some embodiments, the pressure measuring device is a pressure gauge.

[0013] In some embodiments, the intracranial pressure probe calibration system further includes: a water bath, wherein the water bath is integrated with a digital thermometer and a heating rod, and the digital thermometer is connected to the heating rod.

[0014] In some embodiments, the heating rod is used to heat the water bath, and the digital thermometer is used to monitor the internal temperature of the water bath in real time, and to turn off the power supply of the heating rod when an alarm is sounded when a preset temperature is reached.

[0015] The utility model provides an intracranial pressure probe calibration system for calibrating an intracranial pressure probe, wherein the intracranial pressure probe is encapsulated with a pressure chip, and may include: a probe detection board, a current limiter, a three-way valve, a pressure pump, a pressure measuring device, and a measuring and display device; the intracranial pressure probe is electrically connected to the probe detection board, a calibration circuit diagram is arranged on the probe detection board, and the probe detection board is also connected to the measuring and display device; the head end of the intracranial pressure probe is placed in the current limiter, and the current limiter is connected to the first channel of the three-way valve; the second channel of the three-way valve is connected to the pressure pump, and the third channel of the three-way valve is connected to the pressure measuring device. The calibration operation process is simple, and general production line workers can complete this process, which greatly reduces the probe calibration time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of a pressure chip according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the tooling of the intracranial pressure probe calibration system according to an embodiment of the utility model;

[0019] Figure 3 It is an overall circuit diagram of a probe detection board according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The intracranial pressure probe consists of a pressure chip, and the pressure chip is encapsulated at the head end of the finished product. The working principle of the pressure chip is as follows Figure 1 As shown, the varistor R3 is located inside the pressure chip and changes its resistance after sensing the pressure change. The varistor R4 is located inside the pressure chip and changes its resistance after sensing the pressure change. The main difficulty in intracranial pressure monitoring at present is how to improve the calibration efficiency and simplify the operation process. For this reason, the utility model provides an intracranial pressure probe calibration system.

[0025] like Figure 2 As shown, the intracranial pressure probe calibration system includes: a probe detection board, a current limiter, a three-way valve, a pressure pump, a pressure measuring device, and a measuring and display device. The intracranial pressure probe is electrically connected to the probe detection board, a calibration circuit diagram is arranged on the probe detection board, and the probe detection board is also connected to the measuring and display device; the head end of the intracranial pressure probe is placed in the current limiter, and the current limiter is connected to the first channel of the three-way valve; the second channel of the three-way valve is connected to the pressure pump, and the third channel of the three-way valve is connected to the pressure measuring device.

[0026] In some embodiments, the flow limiter may include a pipeline and a flow limiter connected to the pipeline, and the flow limiter is used to control whether the air pressure inside the pipeline is connected to the atmosphere. Specifically, the flow limiter is a valve or a switch that can achieve the above-mentioned connection.

[0027] In a specific embodiment, the probe detection board is a tooling board with integrated probe zeroing, calibration, and temperature drift compensation functions. The measuring and display device is an integrated device with integrated voltage measurement, resistance measurement, and display functions. By switching different gears, the work of measuring the positive and negative pressure difference of the intracranial pressure probe and the resistance of the intracranial pressure probe can be completed. The current limiter is used to control whether the air pressure inside the current limiter pipeline is in circulation with the atmosphere. The pressure measuring device is used to detect the pressure inside the current limiter pipeline. Among them, the pressure measuring device is a pressure gauge.

[0028] In the embodiment of the utility model, the intracranial pressure probe is electrically connected to the probe detection board, that is, the piezoresistors R3 and R4 located inside the pressure chip are connected to the calibration circuit diagram. The calibration circuit diagram after connecting the piezoresistors R3 and R4 is as follows: Figure 3 As shown, the pressure chip output terminal (-Out) corresponds to Figure 3 At 1, the pressure chip input terminal (+In) corresponds to Figure 3 At 2, the pressure chip output terminal (+Out) corresponds to Figure 3 3. Variable resistor R1 is used to adjust the circuit balance. Variable resistor R2 is used to adjust the sensitivity of the pressure chip. Fixed resistor R5 and varistor R3 form the minimum application circuit. Fixed resistor R6 and varistor R4 form the minimum application circuit. Rx and Ry are temperature drift compensation resistors, both of which are fixed resistors.

[0029] During the calibration process, zeroing is first performed. The zeroing operation is as follows: adjust the pressure pump so that the pressure inside the limiter pipeline is 0 and the pressure gauge displays a pressure of 0 mmHg. Adjust the measuring and display device to the voltage measurement position and measure the voltage difference between the positive and negative terminals of the pressure chip, that is, Figure 3 There is a voltage difference between pin 3 and pin 1. At this time, adjust the variable resistor R1 to make this voltage difference 0, and the voltage difference displayed by the measuring and display device is also 0mv.

[0030] After zeroing, perform calibration. The calibration operation is as follows: adjust the pressure pump so that the pressure gauge displays a pressure of 200mmHg. At this time, adjust the measuring and display device to the voltage measurement gear, and adjust the variable resistor R2 so that the pressure difference between pin 3 and pin 1 is 5mv. After zeroing, the pressure difference between the positive and negative ends of the pressure chip should be 25uV / mmHg, that is, for every 1mmHg of pressure on the pressure chip, a 25uV voltage difference is generated between its positive and negative ends.

[0031] Finally, the test is carried out. The test operation is as follows: select several points in the pressure range of 0-200mmHg as the pressure source of the pressure pump, adjust the measurement and display device to the voltage measurement gear, and observe whether the pressure difference between the positive and negative ends of the pressure chip meets the corresponding relationship of 25uV / mmHg. If this pressure difference meets the corresponding relationship of 25uV / mmHg, the pressure of this intracranial pressure probe is qualified. If this pressure difference does not meet the corresponding relationship of 25uV / mmHg, it is necessary to re-zero calibration and re-test after zero calibration.

[0032] The utility model provides an intracranial pressure probe calibration system, including: a probe detection board, a current limiter, a three-way valve, a pressure pump, a pressure measuring device, and a measuring and display device, wherein the intracranial pressure probe is electrically connected to the probe detection board, specifically, by wire welding or contact connection; and a calibration circuit diagram is arranged on the probe detection board, and the probe detection board is also connected to the measuring and display device; the head end of the intracranial pressure probe is placed in the current limiter, and the current limiter is connected to the first channel of the three-way valve; the second channel of the three-way valve is connected to the pressure pump, and the third channel of the three-way valve is connected to the pressure measuring device. By designing the above intracranial pressure probe calibration system, the calibration operation process is simple, and general production line workers can complete this process, greatly reducing the probe calibration time.

[0033] In some embodiments, Figure 1 As shown, the intracranial pressure probe calibration system also includes: a water bath, the water bath is integrated with a digital thermometer and a heating rod, and the digital thermometer is connected to the heating rod.

[0034] In a specific embodiment, the heating rod is used to heat the water bath, and the digital thermometer is used to monitor the internal temperature of the water bath in real time, and when the preset temperature is reached, the power supply of the heating rod is turned off. The preset temperature is set according to the project requirements.

[0035] In the embodiment of the utility model, before calibrating the intracranial pressure probe, it is necessary to obtain the temperature drift compensation resistors Rx and Ry. First, weld the probe to the probe detection board, and then connect the probe detection board to the measurement and display device. For the connection method, see Figure 3 Then, the intracranial pressure probe was placed in a 25-degree Celsius water bath and a 45-degree Celsius water bath respectively, and the measuring and display device was adjusted to the resistance measurement gear. After stabilization for two minutes, the resistance values ​​of the varistors R3 and R4 currently displayed by the measuring and display device were recorded respectively, and the recorded resistance values ​​were R3(25), R4(25), R3(45), and R4(45).

[0036] Substitute the resistance into the temperature drift compensation resistor calculation formula. The principle of this formula is that there is a temperature drift compensation resistor Rx or Ry that makes the following formula valid:

[0037] R3x(45) / R4(45)=R3x(25) / R4(25)

[0038] Among them, Rx is the temperature drift compensation resistor connected in parallel between the pressure chips 2 and 3, Ry is the temperature drift compensation resistor connected in parallel between the pressure chips 2 and 1, R3x(45) is the resistance value of the varistor R3 in parallel with the temperature drift compensation resistor Rx at 45 degrees Celsius, and R3x(25) is the resistance value of the varistor R3 in parallel with the temperature drift compensation resistor Rx at 25 degrees Celsius.

[0039] Substituting the detailed resistance value measured above into R3x(45) / R4(45)=R3x(25) / R4(25) yields:

[0040] Rx=(R3(45)*R3(25)*R4(45)-R3(45)*R3(25)*R4(10)) / (R3(45)*R4(25)-R3(25*R4(45))).

[0041] Similarly, we can get:

[0042] Ry=(R4(45)*R3(25)*R4(25)-R3(45)*R4(25)*R4(45)) / (R3(25)*R4(45)-R3(45)

[0043] *R4(25)).

[0044] Obtain Rx and Ry, and connect the corresponding resistors with positive calculation results into the circuit to form the calibration circuit diagram on the probe detection board.

[0045] Furthermore, after the intracranial pressure probe pressure test is qualified, the temperature drift compensation resistor is measured to verify whether the temperature drift compensation resistor is qualified. Place the intracranial pressure probe in a 25-degree Celsius water bath, adjust the measurement and display device to the voltage measurement gear, and after stabilization for two minutes, measure the pressure difference between the positive and negative ends of the pressure chip, and record the voltage difference value displayed on the display at this time. Then place the probe in a 45-degree Celsius water bath and repeat the previous step.

[0046] If the temperature drift compensation resistor of the intracranial pressure probe is qualified, the voltage difference between the positive and negative terminals of the pressure chip at 25 degrees Celsius and the voltage difference between the positive and negative terminals of the pressure chip at 45 degrees Celsius shall not exceed 50uV.

[0047] It is understandable that the data in the above detection process is not limited to 25uV / mmHg, 50uV, etc.; different detection parameters can be made according to the different forms and types of intracranial pressure probes.

[0048] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An intracranial pressure probe calibration system, used for calibrating an intracranial pressure probe, wherein the intracranial pressure probe is encapsulated with a pressure chip, characterized in that: The intracranial pressure probe calibration system comprises: a probe detection board, a flow limiter, a three-way valve, a pressure pump, a pressure measuring device, and a measuring and display device; The intracranial pressure probe is electrically connected to the probe detection board, a calibration circuit diagram is arranged on the probe detection board, and the probe detection board is also connected to the measurement and display device; The head end of the intracranial pressure probe is placed in the flow limiter, and the flow limiter is connected to the first channel of the three-way valve; The second channel of the three-way valve is connected to the pressure pump, and the third channel of the three-way valve is connected to the pressure measuring device.

2. The intracranial pressure probe calibration system according to claim 1, characterized in that: The probe detection board is a tooling board card integrating probe zero adjustment, calibration and temperature drift compensation functions.

3. The intracranial pressure probe calibration system according to claim 1, characterized in that: The measuring and display device is an integrated device that integrates voltage measurement, resistance measurement, and display functions. The measuring and display device is used to measure the positive and negative pressure difference of the intracranial pressure probe and the resistance of the intracranial pressure probe.

4. The intracranial pressure probe calibration system according to claim 1, characterized in that: The flow limiter comprises a pipeline and a flow limiter connected to the pipeline, and the flow limiter is used to control whether the air pressure inside the pipeline is connected to the atmosphere.

5. The intracranial pressure probe calibration system according to claim 4, characterized in that: The pressure measuring device is used to detect the internal pressure of the pipeline.

6. The intracranial pressure probe calibration system according to claim 1, characterized in that: The pressure measuring device is a pressure gauge.

7. The intracranial pressure probe calibration system according to claim 1, characterized in that: The intracranial pressure probe calibration system also includes: a water bath, wherein the water bath is integrated with a digital thermometer and a heating rod, and the digital thermometer is connected to the heating rod.

8. The intracranial pressure probe calibration system according to claim 7, characterized in that: The heating rod is used to heat the water bath, and the digital thermometer is used to monitor the internal temperature of the water bath in real time and to turn off the power supply of the heating rod when an alarm is sounded when a preset temperature is reached.

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