CN113143239A - Sensor switching module - Google Patents
Sensor switching module Download PDFInfo
- Publication number
- CN113143239A CN113143239A CN202110546136.2A CN202110546136A CN113143239A CN 113143239 A CN113143239 A CN 113143239A CN 202110546136 A CN202110546136 A CN 202110546136A CN 113143239 A CN113143239 A CN 113143239A
- Authority
- CN
- China
- Prior art keywords
- sensor
- pressure sensor
- differential signal
- differential
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 claims abstract description 46
- 238000005259 measurement Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 25
- 230000000007 visual effect Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 239000003086 colorant Substances 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 claims description 2
- 238000007917 intracranial administration Methods 0.000 abstract description 28
- 238000012806 monitoring device Methods 0.000 abstract description 22
- 230000006870 function Effects 0.000 description 6
- 238000009530 blood pressure measurement Methods 0.000 description 5
- 230000036772 blood pressure Effects 0.000 description 3
- 210000004556 brain Anatomy 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000000338 in vitro Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/031—Intracranial pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Neurosurgery (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The invention relates to the technical field of intracranial pressure detection equipment, in particular to a sensor switching module which is used for connecting a physiological pressure sensor and monitoring equipment and comprises a micro-control unit, a sensor differential signal measuring circuit, a differential signal generating circuit and a switching circuit, wherein a micro-controller is connected with the switching circuit; the microcontroller is connected with the physiological pressure sensor, and when the monitoring device is switched to a zero calibration mode, the microcontroller is connected with the differential signal generating circuit and used for controlling the differential signal generating circuit to generate a differential voltage value according to data in the memory unit of the physiological pressure sensor and sending the differential voltage value to the monitoring device; when the sensor zero calibration mode is switched, the microcontroller is connected with the sensor differential signal measuring circuit and is used for measuring the differential voltage value of the physiological pressure sensor and writing the obtained differential voltage value into a memory unit of the physiological pressure sensor; when the physiological pressure sensor is switched to the measurement mode, the differential voltage fed back by the physiological pressure sensor is directly sent to the monitoring equipment.
Description
Technical Field
The invention relates to the technical field of intracranial pressure detection equipment, in particular to a sensor switching module.
Background
The current intracranial pressure measuring method is generally that an intracranial pressure sensor is implanted into a ventricle or in brain parenchyma to carry out real-time monitoring on pressure, a voltage value fed back by a probe of the intracranial pressure sensor is transmitted to a special intracranial pressure monitor device through a medical cable, and the special monitor device carries out filtering, amplification, analog-to-digital conversion and other processing on the fed-back voltage value and then displays the processed voltage value on a screen of the monitor device in an intuitive numerical value or waveform.
With the development of the field of neurosurgery, at present, neurosurgeons do not simply limit the aim of intracranial pressure detection to the magnitude of numerical value, and more commonly, neurosurgeons comprehensively analyze intracranial pressure measurement numerical value and other physiological parameters (such as blood pressure, heart rate and the like) to obtain physiological parameters such as brain perfusion pressure CPP, cerebrovascular reaction index (such as RAC, PRx, PAx) and the like which further reflect the blood and oxygen supply conditions of the brain.
However, all the intracranial pressure sensors are imported products, and must be used together with an imported special detection host, and the detection host only displays one parameter of the intracranial pressure value, and for the value, medical personnel need to vacate extra space in crowded ICU wards and operating rooms to place the special intracranial pressure detection host. Although the measurement sensitivity of the current multi-parameter monitor or central monitoring system with invasive pressure measurement function is 5 muV/V/mmHg, the feedback sensitivity is consistent with that of codman intracranial pressure sensors and domestic Talensor intracranial pressure sensors, because the intracranial pressure sensors only have one-time external zero calibration opportunity when in use, the intracranial pressure sensors cannot be taken out for zero calibration after being implanted into the intracranial of a patient, and thus the use of the intracranial pressure sensors is obviously different from that of invasive blood pressure sensors (the invasive blood pressure sensors are in vitro, and the monitor can perform zero calibration again on the re-accessed sensors through a three-way valve). However, the current multi-parameter monitor or central monitoring system with invasive pressure measurement function does not have zero point recording function, so that once the intracranial pressure sensor and the multi-parameter monitor or central monitoring system are disconnected, the difference between the display value when re-detecting and the actually measured intracranial pressure value is large.
Therefore, a sensor switching module which is small in size, convenient and fast to use and capable of directly switching intracranial pressure sensor signals to a multi-parameter monitor or a central monitoring system is urgently needed in clinic at present. After the multi-parameter monitor or the central monitoring system with the invasive pressure measurement function is connected with the switching module, because the zero value of the intracranial pressure sensor can be recorded on the intracranial pressure sensor, the multi-parameter monitor or the central monitoring system can obtain the zero value of the intracranial pressure sensor and re-zero the zero value under the condition that the intracranial pressure sensor is not taken out of a patient, and the correct intracranial pressure value is guaranteed to be displayed, so that the technical problem is solved.
Disclosure of Invention
The invention aims to provide a sensor switching module, which solves the problems that the existing intracranial pressure sensor only has the chance of zero calibration in vitro once, the existing monitoring equipment with the invasive pressure measurement function does not have the zero point recording function, and the difference between the detected value and the actual value is larger after the intracranial pressure sensor is disconnected from the monitoring equipment.
In order to solve the technical problems, the invention adopts the following technical scheme:
a sensor switching module is used for connecting a physiological pressure sensor and monitoring equipment and comprises a microcontroller, a sensor differential signal measuring circuit, a differential signal generating circuit and a switching circuit;
the microcontroller is connected with the switching circuit and is used for switching the switching module to a sensor zero calibration mode, a monitoring equipment zero calibration mode or a measurement mode;
the microcontroller is connected with the physiological pressure sensor and is used for reading data in a memory unit of the physiological pressure sensor;
when the switching module is switched to a zero calibration mode of the monitoring equipment, the microcontroller is connected with the differential signal generating circuit and is used for controlling the differential signal generating circuit to generate a differential voltage value according to data in the memory unit of the physiological pressure sensor and sending the differential voltage value to the monitoring equipment;
when the switching module is switched to a sensor zero calibration mode, the microcontroller is connected with the sensor differential signal measuring circuit and is used for measuring the differential voltage value of the physiological pressure sensor and writing the obtained differential voltage value into a memory unit of the physiological pressure sensor;
when the switching module is switched to a measuring mode, the differential voltage fed back by the physiological pressure sensor is directly sent to the monitoring equipment.
The sensor differential signal measuring circuit is connected with a differential signal amplifier and used for converting differential voltage fed back by the physiological pressure sensor into a single-ended signal which can be identified by an analog-digital conversion module of the microcontroller, the analog-digital conversion module in the microcontroller receives the single-ended voltage amplified by the differential signal amplifier, and then the actual differential voltage value of the physiological pressure sensor is calculated according to the gain of the differential signal amplifier.
A still further technical scheme is that a signal measuring end of the sensor differential signal measuring circuit is connected with an electrostatic protection device for electrostatic protection at an interface, and is connected with an RC filter for inhibiting a common-mode signal so as to extract a weak physiological differential signal, and then is connected with the differential signal amplifier, wherein the differential signal amplifier is a differential signal amplifier with a high common-mode inhibition ratio and is used for effectively amplifying the received weak differential signal.
A further technical scheme is that a fully differential operational amplifier is connected to the differential signal generating circuit, and a reference level of the fully differential operational amplifier is generated by a high-precision linear power supply to ensure that the instability of the output signal is caused by the instability of the reference level, wherein the reference level is used for improving the common-mode voltage of the output signal so that the monitoring device can correctly identify the connection of the physiological pressure sensor.
According to a further technical scheme, a self-checking module for detecting the output voltage of the digital-analog conversion module is further arranged in the switching module so as to be matched with the microcontroller for fine adjustment and self-checking of the generated differential voltage.
The technical scheme is that the device further comprises a key signal input and indicator light output circuit, and the key signal input and indicator light output circuit forms at least one key switch and at least one indicator light on the switching module.
A further technical scheme is that the number of the key switches is three, the number of the indicator lights is five, the three key switches are respectively a sensor zero calibration mode key, a monitoring device zero calibration mode key and a measurement mode key, the five indicator lights provide visual prompts with different colors and/or different flashing frequencies, and the provided visual prompts respectively are as follows: the normal working state of the module, whether the sensor is connected or not, whether the sensor has already calibrated zero, a zero calibration mode of the monitoring equipment and a measurement mode.
The technical scheme is that the device further comprises a sensor access detection circuit, wherein the sensor access detection circuit comprises a resistor connected in series with the sensor differential signal measurement circuit and is used for detecting whether the differential signal line has common-mode voltage and judging whether the sensor is accessed.
The technical scheme is that a key anti-shaking unit is arranged in the switching module and used for preventing the three key switches from being pressed by mistake and receiving wrong instructions.
Compared with the prior art, the invention has the beneficial effects that: the monitoring device comprises a sensor switching module, a microcontroller, a differential signal generating circuit, a monitoring device and a monitoring device, wherein the sensor switching module is connected with the monitoring device and is powered on, the microcontroller reads a memory unit of the physiological pressure sensor, if a zero value exists in the memory unit of the physiological pressure sensor, after receiving a zero calibration mode instruction entering the monitoring device, the microcontroller controls the differential signal generating circuit to generate a corresponding differential voltage value according to data in the memory unit in the physiological pressure sensor and sends the differential voltage value to the monitoring device, at the moment, zero calibration can be carried out on an invasive channel of the monitoring device, the switching module can be switched to a measurement mode after the zero calibration is finished, and real-time differential voltage of the physiological pressure sensor is directly sent to the monitoring device for display; if the microcontroller does not detect that a zero value exists in the memory unit of the physiological pressure sensor, the switching module visually prompts a user to switch to a sensor zero calibration mode to calibrate the physiological pressure sensor through the indicator lamp, the microcontroller controls the differential signal measuring circuit to measure a differential voltage value (namely zero data) fed back by the physiological pressure sensor after switching to the zero calibration mode, then the differential voltage value is written into the memory unit of the physiological pressure sensor, and finally the indicator lamp visually prompts that the physiological pressure sensor is successfully calibrated, and when the sensor is disconnected with the monitoring device, the conversion module can output the data recorded in the memory unit of the physiological pressure sensor to the monitoring device to calibrate the zero, so that the requirement that the monitoring device needs secondary zero calibration is met.
Drawings
Fig. 1 is a structural frame of the sensor adapter module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example (b):
fig. 1 shows a preferred embodiment of a sensor adapter module according to the present invention, the sensor adapter module in this embodiment is used for connecting a physiological pressure sensor and a monitoring device, the adapter module specifically includes a microcontroller, a sensor differential signal measuring circuit, a differential signal generating circuit, and a switching circuit, the microcontroller is connected with the switching circuit, and is used for switching the adapter module to a sensor zero calibration mode, a monitoring device zero calibration mode, or a measuring mode; the microcontroller is connected with the physiological pressure sensor and is used for reading data in a memory unit of the physiological pressure sensor; when the switching module is switched to a zero calibration mode of the monitoring equipment, the microcontroller is connected with the differential signal generating circuit and is used for controlling the differential signal generating circuit to generate a differential voltage value according to data in the memory unit of the physiological pressure sensor and sending the differential voltage value to the monitoring equipment; when the switching module is switched to a sensor zero calibration mode, the microcontroller is connected with the sensor differential signal measuring circuit and is used for measuring the differential voltage value of the physiological pressure sensor and writing the obtained differential voltage value into a memory unit of the physiological pressure sensor; when the switching module is switched to the measurement mode, the differential voltage fed back by the physiological pressure sensor is directly sent to the monitoring equipment.
The sensor switching module is accessed to the monitoring equipment and powered on, and then starts to detect whether the sensor is accessed until the physiological pressure sensor is accessed, the microcontroller (namely, the MCU) reads the memory unit of the physiological pressure sensor, if zero data exists in the memory unit of the physiological pressure sensor (namely, the intracranial pressure sensor), the existing data is verified, after the verification is passed, the data is written into the cache region of the switching module as correct zero data, otherwise, the data can be visually prompted through the indicator lamp: the sensor should be zero-checked, and after the operation is zero-checked, the zero-point data is sent to the physiological pressure sensor, so that the physiological pressure sensor stores the zero-point data. After the conversion module enters the next stage, after receiving the instruction of entering the zero calibration mode of the monitoring equipment, the microcontroller controls the differential signal generating circuit to generate a corresponding differential voltage value according to data in the memory unit in the physiological pressure sensor and sends the differential voltage value to the monitoring equipment, and at the moment, zero calibration can be carried out on an invasive channel of the monitoring equipment. After receiving the instruction of entering the measurement mode, the conversion module can be switched into the measurement mode, and the real-time differential voltage of the physiological pressure sensor is directly sent to the monitoring equipment for display; the conversion module can be switched into a sensor zero calibration mode after receiving an instruction of entering the sensor zero calibration mode, the microcontroller controls the differential signal measurement circuit to measure a differential voltage value fed back by the physiological pressure sensor after the conversion module is switched into the zero calibration mode, then the microcontroller writes the differential voltage value into a memory unit of the physiological pressure sensor, and then the indication lamp visually prompts that the physiological pressure sensor is successfully zero calibrated.
The monitoring device is a multi-parameter monitor or a central monitoring system.
The switching circuit is composed of an analog switch CD4052 with low on-resistance, and a control signal end of the analog switch CD4052 is connected into an I0 port of the micro controller, so that the switching operation is controlled.
The sensor differential signal measuring circuit is internally connected with a differential signal amplifier and used for converting differential voltage fed back by the physiological pressure sensor into a single-ended signal which can be identified by an analog-digital conversion module of the microcontroller, the single-ended voltage output by the analog-digital conversion module differential signal amplifier in the microcontroller after amplification, and then the differential voltage value of the physiological pressure sensor is calculated according to the gain of the differential signal amplifier. The weak differential signal fed back by the physiological pressure sensor is filtered by an RC filter to retain an effective differential signal, then enters the input end of a differential signal amplifier with a high common-mode rejection ratio, is amplified by the amplifier to convert the input weak signal into a single-ended signal which can be identified by an analog-digital conversion module of the microcontroller, and is subjected to microcontroller control to calculate the actual differential voltage value of the physiological pressure sensor according to the gain of the differential amplifier.
An electrostatic protection device (namely an ESD protection device) is added at the measuring end of the sensor differential signal measuring circuit and used for interface electrostatic protection, and meanwhile, RC filters with two symmetrical sides are added in the sensor differential signal measuring circuit, so that common-mode signals coming from an input end interface can be well restrained, and then a differential signal amplifier with a high common-mode rejection ratio is connected to convert the common-mode signals into single-ended signals. The reference level of the differential signal amplifier is obtained by generating and dividing voltage by a high-precision linear power supply, the stability of the reference level is ensured, the differential signal amplifier converts the differential signal of the physiological pressure sensor into a signal which can be identified by an analog-digital conversion module (namely ADC) of the microcontroller, and then the signal is connected to the input end of the analog-digital conversion module of the microcontroller and is processed by a processing system in the microcontroller to obtain the parameter of the physiological pressure sensor.
And pressing a zero calibration key on the switching module, and enabling the switching module to enter a sensor zero calibration mode. The user needs to place the probe of the physiological pressure sensor on the water surface. When the switching module firstly switches the analog switches to the same input (simultaneously connected with the same level), the reference voltage V of the zero point of the output voltage of the differential signal amplifier at the moment is recordedrefThen the switching module switches the analog switch to the input end of the physiological pressure sensor and records the output voltage V of the amplifier at the momentzero. The microcontroller calculates the differential voltage data of the sensor at the moment as (V)zero - Vref) And/(amplifier gain), recording the obtained differential voltage data, and sending the data to a memory unit in the physiological pressure sensor for storage.
The differential signal generating circuit is connected with a fully differential operational amplifier, and the reference level of the fully differential operational amplifier is generated by a high-precision linear power supply and used for improving the common-mode voltage of the output signal so that the monitoring equipment can correctly identify the connection of the physiological pressure sensor. Two paths of digital-to-analog conversion modules (namely DAC) of the microcontroller output voltages which pass through a voltage divider (the voltage divider is generated by two low-temperature-drift precision resistors and converts a large millivolt signal into a small microvolt signal) to obtain an expected differential signal, and the generated signal common mode voltage is too small to be directly identified by a judging circuit for detecting whether a sensor is connected or not by monitoring equipment, so that the common mode voltage of the sensor is improved by connecting a fully differential operational amplifier and then is output. The input common-mode voltage of the fully-differential operational amplifier is generated by a high-precision linear power supply so as to obtain a stable output level, and the differential signal obtained by the monitoring equipment is stable.
And a self-checking module for detecting the output voltage of the digital-analog conversion module is also arranged in the switching module so as to cooperate with the microcontroller to finely adjust and self-check the generated differential voltage. The differential signal generated by the microcontroller is looped back to the input end of the microcontroller through the switching circuit so as to calculate the linearity of the output voltage, and the target differential voltage to be generated is calculated according to the linearity. When the switching module is powered on, the difference voltage V of the same value output by the two paths of digital-analog conversion modules of the recording microcontroller0Recording the differential voltage V when the two paths of outputs are unbalanced1。（V1-V0) And (4) the input difference is the output linearity, the recorded linearity is recorded, and after receiving an output zero point instruction, the differential voltage output required to be output by the digital-analog conversion module is converted according to the zero point data recorded in the memory unit of the physiological pressure sensor and then is output to the monitoring equipment for zero calibration.
The switching module further comprises a key signal input and indicator light output circuit, and the key signal input and indicator light output circuit forms at least one key switch and at least one indicator light on the switching module. Specifically, key signal input and pilot lamp output circuit can form three key switch and five pilot lamps on switching module, and three key switch is sensor zero calibration mode button, guardianship equipment zero calibration mode button and measurement mode button respectively, and five pilot lamps provide visual cue with different colors and/or different flicker frequency, and the visual cue that provides does respectively: the normal working state of the module, whether the sensor is connected or not, whether the sensor has already calibrated zero, a zero calibration mode of the monitoring equipment and a measurement mode.
Sensor zero calibration mode button: when the key is pressed, the zero voltage of the physiological pressure sensor is recorded in the memory unit of the physiological pressure sensor. Zero calibration mode key of monitoring equipment: when the key is pressed down, the switching module outputs the zero voltage recorded in the physiological pressure sensor after conversion, and the monitoring equipment performs zero calibration operation at the moment. Measurement mode button: when the key is pressed, the switching module directly connects the differential voltage of the physiological pressure sensor to the input end of the monitoring equipment through the analog switch, and the key is pressed when the monitoring equipment completes zero calibration in actual operation. Module normal work pilot lamp: when the self-checking of the switching module is passed, the switching module is turned on and off according to a certain frequency; sensor presence or absence indicator light: detecting whether the physiological pressure sensor is accessed, if the physiological pressure sensor is not accessed, turning on, otherwise, turning off; sensor zero-calibrated indicator: if the physiological pressure sensor needs to be calibrated to zero, the physiological pressure sensor quickly flickers (2 Hz frequency and 50 percent duty ratio), and if the physiological pressure sensor is calibrated to zero, the physiological pressure sensor is normally on; zero calibration mode indicator lamp of monitoring equipment: indicating that the current output of the switching module is the zero point of the physiological pressure sensor; measurement mode indicator light: indicating that the current switch-over module has switched to an output state in which the physiological pressure sensor is directly connected to the monitoring device.
The sensor access detection circuit comprises a resistor connected in series with the sensor differential signal measurement circuit and is used for detecting whether the differential signal line has common-mode voltage and judging whether the sensor is accessed. After the module is powered on, the switching module always detects the common mode level on the differential signal line, and if the common mode level reaches a set threshold value, the sensor is judged to be connected. The module will automatically read the data of the memory cells in the sensor. When the sensor is detected to be disconnected, the switching module automatically disconnects the signal input end of the monitoring equipment. And prompting the monitoring equipment that the sensor falls off.
The monitoring device is characterized by further comprising a micro-control peripheral circuit, the micro-control peripheral circuit comprises a power supply, a clock, an RC reset circuit and an SWD debugging and communication circuit, the power supply is a 5V power supply provided for the input end of the monitoring device, the 5V power supply is used for supplying power to the inner core of the microcontroller after being reduced to 3.3V by a high-precision linear power supply, the 3.3V power supply is used for supplying power to the analog power supply of the microcontroller after being filtered, the clock adopts an 8Mhz crystal resonator, and the communication circuit is communicated with the outside through USART and IIC interfaces provided inside the microcontroller.
The switching module is internally provided with a key anti-shake unit for preventing the switching module from receiving an error command due to mistaken pressing of three key switches, and the design is mainly used for preventing the switching module from receiving an unexpected error command due to misoperation or external interference and other factors. When the physiological pressure sensor is not zero-calibrated, the zero calibration mode key and the measurement mode key of the monitoring equipment are invalid. When the physiological pressure sensor is detected to be successfully zeroed, if the physiological pressure sensor needs to be zeroed again, the unlocking key (the monitoring device zero calibration mode key and the measurement mode key are pressed at the same time) can be zeroed again.
Writing and reading hardware parameters of the switching module and zero calibration data: the gain of the amplifier is written into the FLASH of the microcontroller through a USART interface on the microcontroller when the hardware is debugged. Because the generated microvolt level signal, the voltage parameter of the power supply is a factor influencing the conversion precision of the ADC and the DAC, and the power supply of each conversion module needs to be accurately measured in the debugging process and then written into the FLASH. The hardware parameters are read every time the computer is started up, so that the accuracy of the output voltage is ensured. The writing and reading of the zero calibration data are realized by simulating IIC communication through an IO port through software, the zero data of the physiological pressure sensor are written into an EEPROM (memory cell) on a signal board of the physiological pressure sensor, when the sensor access is detected, a program automatically reads the data in the EEPROM on the signal board of the physiological pressure sensor, and if the zero signal exists, whether the data are correct is checked. Under the correct condition, the signal indicator lamp of the switching module is normally on to indicate, and at the moment, the physiological pressure sensor has already calibrated zero, and can output zero; if the checksum is incorrect or no data is available, it is indicated by a signal indicator light, at which time the physiological pressure sensor needs to be zeroed.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (9)
1. A sensor switching module, characterized by: the switching module is used for connecting the physiological pressure sensor and the monitoring equipment and comprises a microcontroller, a sensor differential signal measuring circuit, a differential signal generating circuit and a switching circuit;
the microcontroller is connected with the switching circuit and is used for switching the switching module to a sensor zero calibration mode, a monitoring equipment zero calibration mode or a measurement mode;
the microcontroller is connected with the physiological pressure sensor and is used for reading data in a memory unit of the physiological pressure sensor;
when the switching module is switched to a zero calibration mode of the monitoring equipment, the microcontroller is connected with the differential signal generating circuit and is used for controlling the differential signal generating circuit to generate a differential voltage value according to data in the memory unit of the physiological pressure sensor and sending the differential voltage value to the monitoring equipment;
when the switching module is switched to a sensor zero calibration mode, the microcontroller is connected with the sensor differential signal measuring circuit and is used for measuring a differential voltage value fed back by the physiological pressure sensor and writing the obtained differential voltage value into a memory unit of the physiological pressure sensor;
when the switching module is switched to a measuring mode, the differential voltage fed back by the physiological pressure sensor is directly sent to the monitoring equipment.
2. The sensor patching module of claim 1, wherein: the sensor differential signal measuring circuit is internally connected with a differential signal amplifier and used for converting differential voltage fed back by the physiological pressure sensor into a single-ended signal which can be identified by an analog-digital conversion module of the microcontroller, the analog-digital conversion module in the microcontroller receives the single-ended voltage output by the differential signal amplifier after amplification, and then the actual differential voltage value of the physiological pressure sensor is calculated according to the gain of the differential signal amplifier.
3. The sensor patching module of claim 2, wherein: the signal measuring end of the sensor differential signal measuring circuit is connected with an electrostatic protection device for electrostatic protection at an interface, and is connected with an RC filter for inhibiting a common mode signal, and then is connected with the differential signal amplifier, wherein the differential signal amplifier is a differential signal amplifier with a high common mode inhibition ratio.
4. The sensor patching module of claim 1, wherein: the differential signal generating circuit is connected with a fully differential operational amplifier, and the reference level of the fully differential operational amplifier is generated by a high-precision linear power supply and used for improving the common-mode voltage of the output signal so that the monitoring equipment can correctly identify the connection of the physiological pressure sensor.
5. The sensor patching module of claim 1, wherein: and a self-checking module for detecting the output voltage of the digital-analog conversion module is also arranged in the switching module so as to cooperate with the microcontroller to finely adjust and self-check the generated differential voltage.
6. The sensor patching module of claim 1, wherein: the switching module is characterized by further comprising a key signal input and indicator light output circuit, wherein the key signal input and indicator light output circuit forms at least one key switch and at least one indicator light on the switching module.
7. The sensor patching module of claim 6, wherein: the key switch sets up to three, the pilot lamp sets up to five, and three key switch is zero calibration mode button, guardianship equipment zero calibration mode button and measurement mode button for the sensor respectively, and five pilot lamps provide visual cue with different colours and/or different scintillation frequency, and the visual cue that provides respectively is: the normal working state of the module, whether the sensor is connected or not, whether the sensor has already calibrated zero, a zero calibration mode of the monitoring equipment and a measurement mode.
8. The sensor patching module of claim 4, wherein: the sensor access detection circuit comprises a resistor connected in series with the sensor differential signal measurement circuit and is used for detecting whether the differential signal line has common-mode voltage and judging whether the sensor is accessed.
9. The sensor patching module of claim 7, wherein: the switching module is internally provided with a key anti-shaking unit for preventing the wrong instructions from being received by mistakenly pressing the three key switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546136.2A CN113143239A (en) | 2021-05-19 | 2021-05-19 | Sensor switching module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546136.2A CN113143239A (en) | 2021-05-19 | 2021-05-19 | Sensor switching module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113143239A true CN113143239A (en) | 2021-07-23 |
Family
ID=76876535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110546136.2A Pending CN113143239A (en) | 2021-05-19 | 2021-05-19 | Sensor switching module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113143239A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4951236A (en) * | 1986-05-05 | 1990-08-21 | Texas Instruments Incorporated | Low cost high precision sensor |
| US20020173724A1 (en) * | 2001-05-18 | 2002-11-21 | Dorando Dale Gene | Signal conditioning device for interfacing intravascular sensors having varying operational characteristics to a physiology monitor |
| US20090001981A1 (en) * | 2007-06-30 | 2009-01-01 | Thirumalai Rengachari | Magnetic field sensor circuit with common-mode voltage nulling |
| CN103158881A (en) * | 2013-02-05 | 2013-06-19 | 南京斯玛特监测科技有限公司 | Onboard miniaturization structure health monitoring system and monitoring method thereof |
| US20130257465A1 (en) * | 2012-03-29 | 2013-10-03 | Codman Neuro Sciences Sarl | Reading Device in Wired Communication With a Probe Having an Embedded Memory Device |
| CN103598888A (en) * | 2013-10-16 | 2014-02-26 | 东北大学 | Wearable human body motion state data monitoring system and method |
| CN104398251A (en) * | 2014-12-05 | 2015-03-11 | 苏州景昱医疗器械有限公司 | Intracranial pressure monitoring system probe and calibrating method thereof |
| CN104652396A (en) * | 2015-01-20 | 2015-05-27 | 重庆大学 | Three-component roadbed karst cave detection sensor and detection system |
| CN106361320A (en) * | 2016-09-26 | 2017-02-01 | 江苏爱思普医疗科技有限公司 | Minimally-invasive intracranial pressure and intracranial temperature monitoring system and probe zeroing method |
| CN207590674U (en) * | 2017-05-23 | 2018-07-10 | 四川经纬灵仪科技有限公司 | Monitoring intracranial pressure device |
-
2021
- 2021-05-19 CN CN202110546136.2A patent/CN113143239A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4951236A (en) * | 1986-05-05 | 1990-08-21 | Texas Instruments Incorporated | Low cost high precision sensor |
| US20020173724A1 (en) * | 2001-05-18 | 2002-11-21 | Dorando Dale Gene | Signal conditioning device for interfacing intravascular sensors having varying operational characteristics to a physiology monitor |
| US20090001981A1 (en) * | 2007-06-30 | 2009-01-01 | Thirumalai Rengachari | Magnetic field sensor circuit with common-mode voltage nulling |
| US20130257465A1 (en) * | 2012-03-29 | 2013-10-03 | Codman Neuro Sciences Sarl | Reading Device in Wired Communication With a Probe Having an Embedded Memory Device |
| CN103158881A (en) * | 2013-02-05 | 2013-06-19 | 南京斯玛特监测科技有限公司 | Onboard miniaturization structure health monitoring system and monitoring method thereof |
| CN103598888A (en) * | 2013-10-16 | 2014-02-26 | 东北大学 | Wearable human body motion state data monitoring system and method |
| CN104398251A (en) * | 2014-12-05 | 2015-03-11 | 苏州景昱医疗器械有限公司 | Intracranial pressure monitoring system probe and calibrating method thereof |
| CN104652396A (en) * | 2015-01-20 | 2015-05-27 | 重庆大学 | Three-component roadbed karst cave detection sensor and detection system |
| CN106361320A (en) * | 2016-09-26 | 2017-02-01 | 江苏爱思普医疗科技有限公司 | Minimally-invasive intracranial pressure and intracranial temperature monitoring system and probe zeroing method |
| CN207590674U (en) * | 2017-05-23 | 2018-07-10 | 四川经纬灵仪科技有限公司 | Monitoring intracranial pressure device |
Non-Patent Citations (1)
| Title |
|---|
| 李希文等: "《传感器与信号调理技术》", 31 December 2008, 西安电子科技大学出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2882734C (en) | Transducer interface system and method | |
| US6585660B2 (en) | Signal conditioning device for interfacing intravascular sensors having varying operational characteristics to a physiology monitor | |
| US6663570B2 (en) | Connector for interfacing intravascular sensors to a physiology monitor | |
| CN107257915B (en) | Measuring bridge assembly and method with improved fault detection | |
| AU2009200189B2 (en) | Detection of current leakage through opto-switches | |
| ES2856009T3 (en) | Blood pressure analysis system and method | |
| US20130310677A1 (en) | Measurement devices for bio-signals | |
| CN111800191A (en) | Optical module debugging device, debugging method and electronic equipment | |
| CN112557722A (en) | Universal oscillograph | |
| KR200427534Y1 (en) | Automatic CEDM Timing Module Sensor Diagnosis System | |
| CN113143239A (en) | Sensor switching module | |
| WO2016094094A1 (en) | System and method of integrating a fractional flow reserve device with a conventional hemodynamic monitoring system | |
| CN105249946A (en) | Invasive blood pressure acquisition circuit for inhibiting temperature drift | |
| CN106855576A (en) | A kind of portable glucose meter | |
| CN110794341A (en) | Invasive sphygmomanometer lead falling detection circuit | |
| WO2015023264A1 (en) | Pressure transducer simulator with rectifier to implement an auto-zeroing command | |
| CN211318711U (en) | Invasive sphygmomanometer lead falling detection circuit | |
| CN117452249B (en) | Test equipment for detecting abnormal resistance | |
| CN220730313U (en) | Voltage test system and voltage test device | |
| CN112438714B (en) | Piezoresistive pressure sensing circuit | |
| CN113252988A (en) | Handheld parameter tester and parameter testing method | |
| CN112213552A (en) | Automatic detection system for medical leakage current instrument | |
| CN115776300A (en) | Detection circuit and detection method of analog-to-digital converter and data sampling system | |
| CN116211274A (en) | Complete ECG contact impedance determination | |
| EP1380255A1 (en) | Electromammograph |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210723 |
|
| RJ01 | Rejection of invention patent application after publication |