Intracranial pressure detection circuit and device

Abstract

The utility model relates to the technical field of pressure detection, and discloses an intracranial pressure detection circuit and equipment, the intracranial pressure detection circuit comprises a sensor chip and a compensating circuit connected with the sensor chip; the sensor chip comprises a first internal resistor and a second internal resistor, the compensating circuit comprises a compensating resistor, one end of the compensating resistor is connected with a first port of the sensor chip, and the other end of the compensating resistor is connected with a second port or a third port of the sensor chip, so that the compensating resistor is connected to two ends of the first internal resistor or the second internal resistor in parallel; and the compensation resistor is used for compensating the temperature drift of the sensor chip. Therefore, the temperature drift of the sensor chip can be compensated through the compensation resistor in the compensation circuit, so that the temperature drift of the sensor chip can be compensated quickly and conveniently, and deviation caused by the temperature drift when the intracranial pressure is detected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure detection, in particular to an intracranial pressure detection circuit and equipment. Background Art

[0002] An intracranial pressure sensor device is a device that senses changes in environmental pressure through a sensor chip set in the device, and converts the pressure signal into an electrical signal to obtain the corresponding intracranial pressure by collecting the electrical signal. Since the assembled device will cause the pressure value output by the sensor device to change due to temperature changes (temperature drift), the accuracy of the measurement result will be affected. On the one hand, the prior art measures the temperature drift of the sensor under each temperature condition, compensates for the temperature drift through software, or optimizes the assembly process to achieve a balance between the various materials, thereby reducing the pressure change caused by the temperature change. However, the above methods all take a long time, the temperature drift compensation efficiency is low, and the compensation difficulty is high. Utility Model Content

[0003] In view of this, the present application provides an intracranial pressure detection circuit and device to solve the problems of low temperature drift compensation efficiency and high compensation difficulty of intracranial pressure sensor equipment.

[0004] In a first aspect, the present application provides an intracranial pressure detection circuit, including a sensor chip and a compensation circuit connected to the sensor chip;

[0005] The sensor chip includes a first internal resistor and a second internal resistor;

[0006] The compensation circuit includes a compensation resistor, one end of which is connected to the first port of the sensor chip, and the other end is connected to the second port or the third port of the sensor chip, so that the compensation resistor is connected in parallel to both ends of the first internal resistor or the second internal resistor; the compensation resistor is used to compensate for the temperature drift of the sensor chip.

[0007] In this way, the temperature drift of the sensor chip can be compensated by the compensation resistor in the compensation circuit, so that the temperature drift of the sensor chip can be compensated quickly and conveniently, avoiding deviation due to temperature drift when detecting intracranial pressure.

[0008] In an optional implementation, the compensation circuit further includes a first zero adjustment resistor and a second zero adjustment resistor;

[0009] One end of the first zero adjustment resistor is connected to the second port, the other end is connected to one end of the second zero adjustment resistor, and the other end of the second zero adjustment resistor is connected to the third port;

[0010] The other end of the first zero adjustment resistor and one end of the second zero adjustment resistor are grounded together;

[0011] The compensation resistor, the first internal resistor, the second internal resistor, the first zero adjustment resistor and the second zero adjustment resistor form a bridge circuit.

[0012] In an optional implementation, the resistance value of the compensation resistor is the first compensation value or the second compensation value;

[0013] The first compensation value is a resistance value calculated when the compensation resistor is connected in parallel across the first internal resistor, and the second compensation value is a resistance value calculated when the compensation resistor is connected in parallel across the second internal resistor.

[0014] In an optional implementation, if the first compensation value is greater than zero, the compensation resistor is connected in parallel across the first internal resistor;

[0015] If the second compensation value is greater than zero, the compensation resistor is connected in parallel across the second internal resistor.

[0016] In an optional embodiment, the compensation circuit also includes a calibration resistor, whose two ends are respectively connected to the second port and the third port, and is used to calibrate the output of the intracranial pressure detection circuit so that the electrical signal output by the intracranial pressure detection circuit under the first pressure condition is a first preset value, and the electrical signal output by the intracranial pressure detection circuit under the second pressure condition is a second preset value.

[0017] In an optional implementation, the first port serves as an input end of the intracranial pressure detection circuit, and is used to access a power supply of the intracranial pressure detection circuit;

[0018] The second port and the third port serve as output ends of the intracranial pressure detection circuit, and are used to output the electrical signal of the circuit to determine the pressure information corresponding to the electrical signal of the intracranial pressure detection circuit.

[0019] In an optional implementation, the first internal resistor is connected between the first port and the second port; and the second internal resistor is connected between the first port and the third port.

[0020] In an optional implementation, two ends of the compensation resistor are connected to the first port and the second port respectively, so as to be connected in parallel to two ends of the first internal resistor;

[0021] Alternatively, two ends of the compensation resistor are connected to the first port and the third port respectively, so as to be connected in parallel to two ends of the second internal resistor.

[0022] In an optional implementation, the first internal resistor and the second internal resistor are varistors.

[0023] In a second aspect, the present application provides an intracranial pressure detection device, comprising the intracranial pressure detection circuit of the above-mentioned first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a structural schematic diagram of an intracranial pressure detection circuit provided in an embodiment of the present application;

[0026] Figure 2 It is a schematic diagram of an equivalent circuit of an intracranial pressure detection circuit provided in an embodiment of the present application.

[0027] The following is a further description of the reference numerals:

[0028] 100 - sensor chip; 111 - first internal resistance; 112 - second internal resistance; 121 - first port; 122 - second port; 123 - third port; 200 - compensation circuit; 210 - compensation resistor; 221 - first zero adjustment resistor; 222 - second zero adjustment resistor; 230 - calibration resistor; 240 - third resistor; 250 - fourth resistor. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application 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 a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0031] Temperature drift refers to a phenomenon in which the output of the sensor changes when the temperature of the external environment changes. Temperature drift will cause the output of the sensor to not correctly reflect the state of the object it detects. Therefore, it is usually necessary to compensate the sensor for temperature drift to solve the error caused by temperature drift. In the related art, for intracranial pressure sensor equipment, software compensation or assembly process optimization methods are usually used to compensate for temperature drift. Specifically, through the software compensation method, it is usually necessary to measure the pressure changes under different temperature conditions and record them in the storage chip, and then the software corrects the pressure value according to the measurement results. This method is not only time-consuming and inefficient, but also has a large discrete type and cannot achieve continuous compensation. However, through the method of optimizing the assembly process, since the size of the intracranial pressure sensor device and the pressure sensor therein are small, the manufacturing process is relatively complicated, the packaging is difficult, the stability is difficult to ensure, the yield is low, and the cost is high.

[0032] Based on this, the present application provides an intracranial pressure detection circuit, including a sensor chip 100 and a compensation circuit 200 connected to the sensor chip 100; the sensor chip 100 includes a first internal resistor 111 and a second internal resistor 112, and the compensation circuit 200 includes a compensation resistor 210, one end of which is connected to the first port 121 of the sensor chip 100, and the other end is connected to the second port 122 or the third port 123 of the sensor chip 100, so that the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111 or the second internal resistor 112; the compensation resistor 210 is used to compensate for the temperature drift of the sensor chip 100. In this way, the temperature drift of the sensor chip 100 can be compensated by the compensation resistor 210 in the compensation circuit 200, so as to quickly and conveniently compensate for the temperature drift of the sensor chip, and avoid deviation due to temperature drift when detecting intracranial pressure.

[0033] Figure 1 is a schematic diagram of the structure of an intracranial pressure detection circuit provided in an embodiment of the present application, such as Figure 1 As shown, the circuit includes a sensor chip 100 and a compensation circuit 200 connected to the sensor chip 100. The sensor chip 100 is used as a pressure sensor, which includes a first internal resistor 111 and a second internal resistor 112; the first internal resistor 111 and the second internal resistor 112 of the sensor chip 100 are piezoresistors, which are used to sense pressure changes, thereby converting pressure signals into electrical signals and outputting them, thereby realizing the detection of intracranial pressure. The compensation circuit 200 is connected to the sensor chip 100, and is used to perform relevant output adjustments on the sensor, and the output adjustments include but are not limited to temperature compensation, zero adjustment, and calibration, etc.

[0034] In the embodiment of the present application, the compensation circuit 200 includes a compensation resistor 210. One end of the compensation resistor 210 is connected to the first port 121 of the sensor chip 100, and the other end of the compensation resistor 210 is connected to the second port 122 or the third port 123 of the sensor chip 100, so that the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111 or the second internal resistor 112 of the sensor chip 100. The compensation resistor 210 is used to compensate for the temperature drift of the sensor chip 100.

[0035] In an optional embodiment, if Figure 1As shown, the compensation circuit 200 also includes a first zero adjustment resistor 221 and a second zero adjustment resistor 222. The first zero adjustment resistor 221 and the second zero adjustment resistor 222 are used to adjust the electrical signal output by the circuit so that the electrical signal output by the circuit under the preset environmental conditions is zero, thereby ensuring that the initial output of the intracranial pressure detection circuit is zero. The preset environmental conditions are that the external temperature is the preset temperature and the air pressure is the preset air pressure. Under normal circumstances, the preset temperature is 38°C, which is consistent with the temperature of the working environment of the intracranial pressure detection circuit, and the preset air pressure is the standard atmospheric pressure, which is consistent with the air pressure of the working environment of the intracranial pressure detection circuit.

[0036] Therefore, the temperature drift of the sensor chip 100 is compensated by the compensation resistor 210 in the compensation circuit 200, and the intracranial pressure detection circuit is zeroed by the first zeroing resistor 221 and the second zeroing resistor 222 in the compensation circuit 200 to avoid deviation when detecting the intracranial pressure. Thus, the temperature drift compensation and zeroing of the intracranial pressure detection circuit are realized by the compensation circuit 200, which can not only quickly and conveniently realize the temperature drift compensation of the sensor chip 100, but also ensure the detection accuracy of the intracranial pressure detection circuit.

[0037] In an optional embodiment, if Figure 1 As shown, one end of the first zeroing resistor 221 is connected to the second port 122, and the other end thereof is connected to one end of the second zeroing resistor 222, and the other end of the second zeroing resistor 222 is connected to the third port 123, and the other end of the first zeroing resistor 221 and one end of the second zeroing resistor 222 are grounded at the same time. Thus, the compensation resistor 210, the first internal resistance 111 and the second internal resistance 112 of the sensor chip 100, the first zeroing resistor 221 and the second zeroing resistor 222 form a bridge circuit, and the first port 121 of the sensor chip 100 and the ground are respectively used as the positive input terminal (+in) and the negative output terminal (-in) of the intracranial pressure detection circuit, and accordingly, the second port 122 and the third port 123 of the sensor chip 100 are respectively used as the positive output terminal (+out) and the negative output terminal (-out) of the intracranial pressure detection circuit. The slight resistance value change of the first internal resistance 111 and the second internal resistance 112 of the sensor chip 100 is amplified and converted into a change of a voltage signal through the bridge circuit, thereby realizing the signal output of the intracranial pressure detection circuit. At the same time, under preset environmental conditions, the resistance values ​​of the first zeroing resistor 221 and the second zeroing resistor 222 can be adjusted by the voltage signal output by the intracranial pressure detection circuit, so that the voltage signal output by the intracranial pressure detection circuit is 0, that is, the composed bridge circuit is balanced. In other words, the first zeroing resistor 221 and the second zeroing resistor 222 in the compensation circuit 200 can not only make the initial output of the intracranial pressure detection circuit zero and reduce the error, but also amplify the output of the intracranial pressure detection circuit, thereby facilitating the detection of pressure changes.

[0038] In an optional embodiment, if Figure 1 As shown, the compensation circuit 200 also includes a calibration resistor 230, which is used to calibrate the output of the intracranial pressure detection circuit so that the electrical signal output by the intracranial pressure detection circuit under the first pressure condition is a first preset value, and the electrical signal output by the intracranial pressure detection circuit under the second pressure condition is a second preset value, wherein the first pressure condition, the second pressure condition, the first preset value and the second preset value can be adjusted according to the product requirements of the sensor chip 100 or the intracranial pressure detection circuit. Optionally, the first pressure condition is the pressure condition corresponding to 0 mmHg, the second pressure condition is the pressure condition corresponding to 200 mmHg, the first preset value is 0V, and the second preset value is 5mV.

[0039] In an optional implementation, the two ends of the calibration resistor 230 are respectively connected to the second port 122 and the third port 123 of the sensor chip 100, that is, the calibration resistor 230 is connected in parallel with or to the internal resistance of the sensor chip 100. Thus, the calibration resistor 230 is equivalent to being connected between the two output ports of the bridge circuit composed of the compensation resistor 210, the first internal resistance 111 of the sensor chip 100, the second internal resistance 112, the first zero adjustment resistor 221 and the second zero adjustment resistor 222. The resistance value change of the calibration resistor 230 will not affect the amplification and conversion of the resistance value change of the sensor chip 100 by the bridge, so adjusting the resistance value of the calibration resistor 230 will not affect the circuit that has been compensated and zeroed, but will only produce a calibration effect.

[0040] In an optional implementation, the resistance value of the compensation resistor 210 is a first compensation value or a second compensation value. The first compensation value is a resistance value calculated when the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111; the second compensation value is a resistance value calculated when the compensation resistor 210 is connected in parallel to both ends of the second internal resistor 112.

[0041] In an optional implementation, in order to ensure that the compensation resistor 210 can have a good compensation effect on the sensor chip 100 under different temperature environments, it is necessary to measure the internal resistance value of the sensor chip 100 under different temperature environments, and then use this to determine the resistance value of the compensation resistor 210. Therefore, the following calculation method can be used to calculate the first compensation value and the second compensation value:

[0042] First, the sensor chip 100 or the circuit or device connected to the sensor chip 100 is placed in an environment of 10° C. and standard atmospheric pressure for 2 minutes, and the resistance value of the first internal resistor 111 of the sensor chip 100 is detected to be R 11 , the resistance value of the second internal resistor 112 is R 21 ;

[0043] Then, the sensor chip 100 or the circuit or device connected with the sensor chip 100 is placed in an environment of 40° C. and standard atmospheric pressure for 2 minutes, and the resistance value of the first internal resistor 111 of the sensor chip 100 is detected to be R 12 , the resistance value of the second internal resistor 112 is R 22 ;

[0044] Finally, the first compensation value and the second compensation value are calculated respectively according to the resistance values ​​of the first internal resistor 111 and the second internal resistor 112 of the sensor chip 100 measured under the above two environments:

[0045] The first compensation value is calculated based on a circuit structure in which the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111. According to the bridge balance principle, it can be known that:

[0046]

[0047] Among them, R x is the first compensation value, R1 is the resistance value of the first internal resistor 111 , R2 is the resistance value of the second internal resistor 112 , R3 is the resistance value of the first zero adjustment resistor 221 , and R4 is the resistance value of the second zero adjustment resistor 222 .

[0048] When the compensation resistor 210 is effective, the bridge should remain balanced in both the 10°C environment and the 40°C environment. Therefore, the resistance values ​​of the first internal resistor 111 and the second internal resistor 112 in the 10°C environment and the 40°C environment are substituted into the first compensation value calculated as shown in the following formula (1):

[0049]

[0050] The second compensation value is calculated based on the circuit structure in which the compensation resistor 210 is connected in parallel to both ends of the second internal resistor 112. According to the bridge balance principle, it can be known that:

[0051]

[0052] Among them, R y is the second compensation value, R1 is the resistance value of the first internal resistor 111 , R2 is the resistance value of the second internal resistor 112 , R3 is the resistance value of the first zero adjustment resistor 221 , and R4 is the resistance value of the second zero adjustment resistor 222 .

[0053] When the compensation resistor 210 is effective, the bridge should remain balanced in both the 10°C environment and the 40°C environment. Therefore, the resistance values ​​of the first internal resistor 111 and the second internal resistor 112 in the 10°C environment and the 40°C environment are substituted into the corresponding values, and the second compensation value is calculated as shown in the following formula (2):

[0054]

[0055] As shown in the above formulas (1) and (2), the values ​​of the first compensation value and the second compensation value are only related to the resistance values ​​of the first internal resistor 111 and the second internal resistor 112, but are not related to the resistance values ​​of the first zero adjustment resistor 221 and the second zero adjustment resistor 222. Therefore, in the compensation resistor 210 circuit, although the compensation resistor 210, the first zero adjustment resistor 221, the second zero adjustment resistor 222 and the calibration resistor 230 are in the same circuit structure, they do not actually affect each other. In other words, the temperature drift compensation, output zero adjustment and output calibration of the sensor chip 100 are all unrelated operations. Therefore, the intracranial pressure detection circuit provided in the embodiment of the present application can simultaneously realize the temperature drift compensation, output zero adjustment and output calibration of the sensor chip 100 through a simple circuit structure, and the above three operations do not affect each other, which is also easy to implement during adjustment and simple to operate.

[0056] In an optional implementation, as shown in the above formula (1) and formula (2), one of the first compensation value and the second compensation value must be greater than or equal to zero, and the other value is less than or equal to zero. In this case, the resistor corresponding to the value greater than zero is used as the access circuit corresponding to the compensation resistor 210. Specifically, if the first compensation value is greater than zero, the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111; if the second compensation value is greater than zero, the compensation resistor 210 is connected in parallel to both ends of the second internal resistor 112.

[0057] In an optional embodiment, Figure 2 is an equivalent circuit diagram of an intracranial pressure detection circuit provided in an embodiment of the present application. Those skilled in the art should know that: Figure 2 The compensation resistor 210 connected in parallel at both ends of the first internal resistor 111 or the second internal resistor 112 is not shown. Figure 2 As shown, the third resistor 240 and the fourth resistor 250 are the resistance values ​​of the compensation circuit 200 after being equivalent, and the first internal resistor 111, the second internal resistor 112, the third resistor 240 and the fourth resistor 250 of the sensor chip 100 form a bridge circuit. Figure 2 As shown, the first port 121 of the sensor chip 100 serves as the input terminal of the circuit, which is used to connect to the power supply of the circuit, that is, the positive input terminal (+in); the second port 122 and the third port 123 of the sensor chip 100 serve as the output terminals of the circuit, which are used to output the electrical signal of the circuit to determine the pressure information corresponding to the electrical signal of the circuit, and one of the second port 122 and the third port 123 serves as the positive output terminal (+out), and the other serves as the negative output terminal (-out).

[0058] In an optional embodiment, if Figure 2As shown, the first internal resistor 111 is connected between the first port 121 and the second port 122, and the second internal resistor 112 is connected between the first port 121 and the third port 123; that is, the first internal resistor 111 and the second internal resistor 112 of the sensor chip 100 are respectively connected between the positive input terminal and one of the output terminals.

[0059] In an optional embodiment, if Figure 2 As shown, the two ends of the compensation resistor 210 are respectively connected to the first port 121 and the second port 122 to be connected in parallel to the two ends of the first internal resistor 111; or, the two ends of the compensation resistor 210 are respectively connected to the first port 121 and the third port 123 to be connected in parallel to the two ends of the second internal resistor 112.

[0060] On the other hand, the present application also discloses an intracranial pressure detection device, which includes any intracranial pressure detection circuit as described above.

[0061] The intracranial pressure detection circuit and device disclosed in the present application include a sensor chip 100 and a compensation circuit 200 connected to the sensor chip 100; the sensor chip 100 includes a first internal resistor 111 and a second internal resistor 112, and the compensation circuit 200 includes a compensation resistor 210, one end of which is connected to the first port 121 of the sensor chip 100, and the other end is connected to the second port 122 or the third port 123 of the sensor chip 100, so that the compensation resistor 210 is connected in parallel to both ends of the first internal resistor 111 or the second internal resistor 112; the compensation resistor 210 is used to compensate for the temperature drift of the sensor chip 100. In this way, the temperature drift of the sensor chip 100 can be compensated by the compensation resistor 210 in the compensation circuit 200, so as to quickly and conveniently compensate for the temperature drift of the sensor chip, and avoid deviation due to temperature drift when detecting intracranial pressure.

[0062] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An intracranial pressure detection circuit, characterized in that: It comprises a sensor chip (100) and a compensation circuit (200) connected to the sensor chip (100); The sensor chip (100) comprises a first internal resistor (111) and a second internal resistor (112); The compensation circuit (200) comprises a compensation resistor (210), one end of which is connected to the first port (121) of the sensor chip (100), and the other end of which is connected to the second port (122) or the third port (123) of the sensor chip (100), so that the compensation resistor (210) is connected in parallel to both ends of the first internal resistor (111) or the second internal resistor (112), and the compensation resistor (210) is used to compensate for the temperature drift of the sensor chip (100).

2. The intracranial pressure detection circuit according to claim 1, characterized in that: The compensation circuit (200) further comprises a first zero adjustment resistor (221) and a second zero adjustment resistor (222); One end of the first zero adjustment resistor (221) is connected to the second port (122), and the other end is connected to one end of the second zero adjustment resistor (222), and the other end of the second zero adjustment resistor (222) is connected to the third port (123); The other end of the first zero adjustment resistor (221) and one end of the second zero adjustment resistor (222) are grounded together; The compensation resistor (210), the first internal resistor (111), the second internal resistor (112), the first zero adjustment resistor (221) and the second zero adjustment resistor (222) form a bridge circuit.

3. The intracranial pressure detection circuit according to claim 1, characterized in that: The resistance value of the compensation resistor (210) is a first compensation value or a second compensation value; The first compensation value is a resistance value calculated when the compensation resistor (210) is connected in parallel across the first internal resistor (111), and the second compensation value is a resistance value calculated when the compensation resistor (210) is connected in parallel across the second internal resistor (112).

4. The intracranial pressure detection circuit according to claim 3, characterized in that: If the first compensation value is greater than zero, the compensation resistor (210) is connected in parallel to both ends of the first internal resistor (111); If the second compensation value is greater than zero, the compensation resistor (210) is connected in parallel across the second internal resistor (112).

5. The intracranial pressure detection circuit according to any one of claims 1 to 4, characterized in that: The compensation circuit (200) further includes a calibration resistor (230), the two ends of which are respectively connected to the second port (122) and the third port (123), and is used to calibrate the output of the intracranial pressure detection circuit so that the electrical signal output by the intracranial pressure detection circuit under the first pressure condition is a first preset value, and the electrical signal output by the intracranial pressure detection circuit under the second pressure condition is a second preset value.

6. The intracranial pressure detection circuit according to any one of claims 1 to 4, characterized in that: The first port (121) serves as an input end of the intracranial pressure detection circuit and is used to access a power supply of the intracranial pressure detection circuit; The second port (122) and the third port (123) serve as output ends of the intracranial pressure detection circuit, and are used to output the electrical signal of the intracranial pressure detection circuit to determine the pressure information corresponding to the electrical signal of the intracranial pressure detection circuit.

7. The intracranial pressure detection circuit according to any one of claims 1 to 4, characterized in that: The first internal resistor (111) is connected between the first port (121) and the second port (122); the second internal resistor (112) is connected between the first port (121) and the third port (123).

8. The intracranial pressure detection circuit according to claim 7, characterized in that: Two ends of the compensation resistor (210) are respectively connected to the first port (121) and the second port (122) so as to be connected in parallel to two ends of the first internal resistor (111); Alternatively, two ends of the compensation resistor (210) are connected to the first port (121) and the third port (123) respectively, so as to be connected in parallel to two ends of the second internal resistor (112).

9. The intracranial pressure detection circuit according to claim 1, characterized in that: The first internal resistor (111) and the second internal resistor (112) are varistors.

10. An intracranial pressure detection device, characterized in that: Comprising the intracranial pressure detection circuit as claimed in any one of claims 1 to 9.

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