Parameter plate for anesthesia depth monitor and anesthesia depth monitor

Abstract

The utility model discloses a parameter board for an anesthesia depth monitor and the anesthesia depth monitor. Only an electroencephalogram acquisition front-end circuit, an SPI (Serial Peripheral Interface) to serial port circuit and a serial communication output interface are arranged on the parameter board. The electroencephalogram acquisition front-end circuit is used for converting an analog electric signal acquired by an external electrode into a digital electric signal and then outputting the digital electric signal to the SPI-to-serial port circuit through the SPI interface, and the SPI-to-serial port circuit is used for interface adaptive conversion between the SPI interface and the serial communication output interface; the serial communication output interface is used for sending the digital electric signal to a main control board of the anesthesia depth monitor through a serial communication data line, so that the main control board converts the digital electric signal into original data. The single-chip microcomputer and the crystal oscillator which are used for acquiring the original data are removed from the parameter board, so that the interference of the circuit of the main control board on the analog-to-digital electric signal circuit is reduced to the greatest extent, and the stability and the reliability of the original data acquired by the anesthesia depth monitor are further improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical detection equipment, and in particular to a parameter board for an anesthesia depth monitor and an anesthesia depth monitor. Background Art

[0002] In clinical surgery, in order to eliminate surgical pain and ensure patient safety, patients need to be deeply anesthetized. However, there is still a risk of various complications after anesthesia. Therefore, it is necessary to monitor the depth of anesthesia of patients. The anesthesia depth monitor is used to monitor the depth of anesthesia during whole-body anesthesia surgery. By detecting auditory evoked potentials, the depth of anesthesia of surgical patients can be monitored in real time to prevent the occurrence of anesthesia complications. The anesthesia depth monitor includes a host housing, an external electrode, a parameter board and a main control board. The parameter board and the main control board are arranged in the host housing. The external electrode is electrically connected to the parameter board through an electrode line (about 1.5 meters) to transmit the collected analog electrical signal to the parameter board. The parameter board is connected to the main control board in the host housing through a data transmission line (about 2 meters) and a connection port set on the host housing. The parameter board is used to convert the analog electrical signal collected by the external electrode into digital form to obtain raw data, and then send the raw data to the main control board through the communication interface. The main control board is used to post-process the raw data. Since brain waves are microvolt-level electrical signals, the circuit design of the parameter board needs to consider how to minimize the interference and impact of internal and external interference signals on the analog electrical signals collected by the external electrodes. Summary of the invention

[0003] The main technical problem solved by the present application is how to reduce and lower the interference of the parameter board's own circuit on the analog electrical signals collected by the external electrodes.

[0004] According to the first aspect, an embodiment provides a parameter board for an anesthesia depth monitor, which is used to convert analog electrical signals collected by external electrodes of the anesthesia depth monitor into digital electrical signals and then send them to a main control board of the anesthesia depth monitor, wherein the parameter board is only provided with an EEG acquisition front-end circuit, an SPI to serial port circuit and a serial communication output interface;

[0005] The EEG acquisition front-end circuit is connected to the external electrode and the SPI-to-serial port circuit respectively, and is used to convert the analog electrical signal into a digital electrical signal and then output it to the SPI-to-serial port circuit through the SPI interface;

[0006] The SPI to serial port circuit is connected to the serial communication output interface and is used for interface adaptation conversion between the SPI interface and the serial communication output interface;

[0007] The serial communication output interface is used to communicate with the main control board through a serial communication data line to send the digital electrical signal to the main control board; the main control board is used to convert the received digital electrical signal into original data so that the main control board can post-process the original data.

[0008] In one embodiment, the EEG acquisition front-end circuit includes an SPI interface chip; the SPI to serial port circuit includes an SPI and TTL serial port conversion chip; and the serial communication output interface includes an RS232 communication chip.

[0009] According to the second aspect, an embodiment provides an anesthesia depth monitor including a main control board and the parameter board described in the first aspect; a serial communication receiving interface is provided on the main control board; the serial communication receiving interface is connected to the serial communication output interface via a serial communication data line for receiving digital electrical signals.

[0010] In one embodiment, the main control board is also provided with a serial port to SPI circuit, a single chip microcomputer and a main control chip;

[0011] The serial port to SPI circuit is electrically connected to the single chip microcomputer and the serial communication receiving interface respectively, and is used for interface adaptation and conversion between the serial communication receiving interface and the SPI interface;

[0012] The serial communication receiving interface is used to send the digital electrical signal to the single chip microcomputer through the serial port to SPI circuit;

[0013] The single chip microcomputer is connected to the main control chip and is used for converting the received digital electrical signal into raw data and then sending the raw data to the main control chip for the main control chip to post-process the raw data.

[0014] In one embodiment, a crystal oscillator is also provided on the main control board for providing a reference frequency to the single chip microcomputer.

[0015] In one embodiment, the serial communication receiving interface includes an RS232 communication chip; the serial port to SPI circuit includes an SPI and TTL serial port conversion chip; the single chip microcomputer is connected to the SPI and TTL serial port conversion chip via the SPI interface.

[0016] In one embodiment, the length of the serial communication data line connecting the serial communication receiving interface and the serial communication output interface is greater than 2 meters.

[0017] In one embodiment, the anesthesia depth monitor includes at least two parameter boards; each parameter board sends a digital electrical signal obtained by converting the analog electrical signal collected by the external electrodes connected to each of the parameter boards to the main control board through the serial communication output interface.

[0018] In one embodiment, the anesthesia depth monitor further includes a signal switching unit, which is disposed on the common end of the serial communication data line connecting each parameter board and the main control board, and is used to select one of the parameter boards to connect to the main control board.

[0019] In one embodiment, each of the parameter boards is independently shielded and packaged.

[0020] According to the anesthesia depth monitor of the above embodiment, the single-chip microcomputer and crystal oscillator used to obtain raw data are removed from the parameter board to minimize the interference of the main control board's own circuit on the analog-to-digital electrical signal circuit, thereby improving the stability and reliability of the raw data obtained by the anesthesia depth monitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure connection of an anesthesia depth monitor in the prior art;

[0022] Figure 2 A schematic diagram of the structural connection of an anesthesia depth monitor in an embodiment;

[0023] Figure 3 FIG. 4 is a schematic diagram of the structural connection of an anesthesia depth monitor in another embodiment. DETAILED DESCRIPTION

[0024] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0025] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0026] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0027] Please refer to Figure 1 , is a structural connection diagram of an anesthesia depth monitor in the prior art, and the anesthesia depth monitor includes an external electrode 2, a parameter board 1 and a main control board 3. The parameter board 1 is provided with an EEG acquisition front-end chip 11, a single-chip microcomputer 13, a crystal oscillator 14 and an RS232 communication transmission chip 12, and the main control board 3 is provided with a main control chip 16 and an RS232 communication receiving chip 15. Since the crystal oscillator 12 and the EEG acquisition front-end chip 11 are shielded and packaged together, the single-chip microcomputer and the crystal oscillator are a kind of digital chip, and the upper and lower edges of their signals change drastically, which will interfere with the analog signal of the EEG acquisition front-end chip, resulting in mixed interference signals in the brain waves. Most manufacturers use the method of optimizing the circuit board routing and adding shielding to reduce this interference, but because the brain wave is a microvolt-level electrical signal, under the superposition of some external strong electromagnetic interference, the signal instability problem is prone to occur. In the embodiment of the present application, the single-chip microcomputer and the crystal oscillator are removed from the parameter board to minimize the interference of the main control board's own circuit to the analog-to-digital electrical signal circuit.

[0028] Embodiment 1:

[0029] Please refer to Figure 2 , is a schematic diagram of the structural connection of an anesthesia depth monitor in an embodiment. The parameter board 1 of the anesthesia depth monitor is used to convert the analog electrical signal collected by the external electrode 2 into a digital electrical signal and then send it to the main control board 3. The parameter board 1 is only provided with an EEG acquisition front-end circuit 21, an SPI to serial port circuit 22 and a serial communication output interface 23. The EEG acquisition front-end circuit 21 is connected to the external electrode 1 and the SPI to serial port circuit 22 respectively, and is used to convert the analog electrical signal into a digital electrical signal and then output it to the SPI to serial port circuit 22 through the SPI interface. The SPI to serial port circuit 22 is connected to the serial communication output interface 23, and is used for interface adaptation conversion between the SPI interface and the serial communication output interface 23. The serial communication output interface 23 is used to communicate with the main control board 3 through a serial communication data line to send the digital electrical signal to the main control board 3. The main control board 3 is used to convert the received digital electrical signal into raw data, so that the main control chip 16 of the main control board 3 can post-process the raw data. In one embodiment, the EEG acquisition front-end circuit 21 includes an SPI interface chip, the SPI to serial port circuit 22 includes an SPI to TTL serial port conversion chip, and the serial communication output interface 23 includes an RS232 communication chip.

[0030] In one embodiment of the present application, an anesthesia depth monitor is also disclosed, including a main control board 3 and the parameter board 1 as described above. A serial communication receiving interface 24 is provided on the main control board 3, and the serial communication receiving interface 24 is connected to the serial communication output interface 23 through a serial communication data line, and is used to receive digital electrical signals. In one embodiment, a serial port to SPI circuit 25, a single-chip microcomputer 13 and a main control chip 16 are also provided on the main control board 3. The serial port to SPI circuit 25 is connected to the single-chip microcomputer 13 and the serial communication receiving interface 24 respectively, and is used for interface adaptation conversion between the serial communication receiving interface 24 and the SPI interface. The serial communication receiving interface 24 is used to send digital electrical signals to the single-chip microcomputer 13 through the serial port to SPI circuit 25. In one embodiment, the single-chip microcomputer 13 is connected to the main control chip 16, and is used to convert the received digital electrical signals into raw data and then send them to the main control chip 16, so as to be used for the main control chip 16 to post-process the raw data. In one embodiment, a crystal oscillator 14 is also provided on the main control board 3, which is used to provide a reference frequency to the single-chip microcomputer 13.

[0031] In one embodiment, the serial communication receiving interface 24 includes an RS232 communication chip, the serial port to SPI circuit 25 includes an SPI to TTL serial port conversion chip, and the single chip microcomputer 13 is connected to the SPI to TTL serial port conversion chip via the SPI interface. In one embodiment, the length of the serial communication data line connecting the serial communication receiving interface 24 and the serial communication output interface 23 is greater than 2 meters.

[0032] Please refer to Figure 3 , is a schematic diagram of the structural connection of an anesthesia depth monitor in another embodiment, the anesthesia depth monitor includes at least two parameter boards 1, each parameter board 1 sends a digital electrical signal obtained by converting an analog electrical signal collected by a respective external electrode connected to the main control board 3 through a serial communication output interface. In one embodiment, the anesthesia depth monitor also includes a signal switching unit 4, which is arranged on the common end of the serial communication data line connecting each parameter board 1 and the main control board 3, and is used to select a parameter board 1 to connect to the main control board 3. Among them, each parameter board 1 is independently shielded and packaged.

[0033] In one embodiment of the present application, the single-chip microcomputer and crystal oscillator in the parameter board are moved to the host of the anesthesia depth monitor. The original direct connection between the single-chip microcomputer and the EEG acquisition front-end chip (SPI interface) is designed to be indirectly controlled through the SPI and TTL serial port conversion chip. The EEG acquisition front-end chip (SPI interface) converts the data stream of the RS232 serial port suitable for remote transmission through the SPI port. The serial port data stream is transmitted to the SPI and TTL serial port conversion chip of the host through wires, and finally connected to the single-chip computer through SPI. This design does not require changing the program code of the original single-chip computer. Since the single-chip microcomputer and crystal oscillator have been removed from the parameter board, they no longer interfere with the analog signal circuits and components of the EEG, thereby enhancing the stability of the signal.

[0034] In the anesthesia depth monitor disclosed in one embodiment of the present application, only an EEG acquisition front-end circuit, an SPI-to-serial port circuit and a serial communication output interface are provided on the parameter board. The EEG acquisition front-end circuit is used to convert the analog electrical signal collected by the external electrode into a digital electrical signal and then output it to the SPI-to-serial port circuit through the SPI interface. The SPI-to-serial port circuit is used for interface adaptation conversion between the SPI interface and the serial communication output interface. The serial communication output interface is used to send the digital electrical signal to the main control board of the anesthesia depth monitor through the serial communication data line, so that the main control board can convert the digital electrical signal into raw data. Since the single-chip microcomputer and crystal oscillator used to obtain the raw data are removed from the parameter board, the interference of the main control board's own circuit to the analog-to-digital electrical signal circuit is minimized, thereby improving the stability and reliability of the raw data obtained by the anesthesia depth monitor.

[0035] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. A parameter board for an anesthesia depth monitor, used to convert analog electrical signals collected by external electrodes of the anesthesia depth monitor into digital electrical signals and then send them to the main control board of the anesthesia depth monitor, characterized in that: The parameter board is only provided with an EEG acquisition front-end circuit, an SPI to serial port circuit and a serial communication output interface; The EEG acquisition front-end circuit is connected to the external electrode and the SPI-to-serial port circuit respectively, and is used to convert the analog electrical signal into a digital electrical signal and then output it to the SPI-to-serial port circuit through the SPI interface; The SPI to serial port circuit is connected to the serial communication output interface and is used for interface adaptation conversion between the SPI interface and the serial communication output interface; The serial communication output interface is used to communicate with the main control board through a serial communication data line to send the digital electrical signal to the main control board; The main control board is used to convert the received digital electrical signal into raw data, so that the main control chip of the main control board can post-process the raw data.

2. The parameter board according to claim 1, characterized in that: The EEG acquisition front-end circuit includes an SPI interface chip; the SPI to serial port circuit includes an SPI and TTL serial port conversion chip; and the serial communication output interface includes an RS232 communication chip.

3. An anesthesia depth monitor, characterized in that: It comprises a main control board and a parameter board as described in any one of claims 1 to 2; a serial communication receiving interface is provided on the main control board; the serial communication receiving interface is connected to the serial communication output interface via a serial communication data line for receiving digital electrical signals.

4. The anesthesia depth monitor according to claim 3, characterized in that: The main control board is also provided with a serial port to SPI circuit, a single chip microcomputer and a main control chip; The serial port to SPI circuit is electrically connected to the single chip microcomputer and the serial communication receiving interface respectively, and is used for interface adaptation and conversion between the serial communication receiving interface and the SPI interface; The serial communication receiving interface is used to send the digital electrical signal to the single chip microcomputer through the serial port to SPI circuit; The single chip microcomputer is connected to the main control chip and is used for converting the received digital electrical signal into raw data and then sending the raw data to the main control chip for the main control chip to post-process the raw data.

5. The anesthesia depth monitor according to claim 4, characterized in that: The main control board is also provided with a crystal oscillator for providing a reference frequency to the single chip microcomputer.

6. The anesthesia depth monitor according to claim 4, characterized in that: The serial communication receiving interface includes an RS232 communication chip; the serial port to SPI circuit includes an SPI and TTL serial port conversion chip; the single chip microcomputer is connected to the SPI and TTL serial port conversion chip via the SPI interface.

7. The anesthesia depth monitor according to claim 4, characterized in that: The length of the serial communication data line connecting the serial communication receiving interface and the serial communication output interface is greater than 2 meters.

8. The anesthesia depth monitor according to claim 4, characterized in that: It comprises at least two parameter boards; each parameter board sends a digital electrical signal obtained by converting an analog electrical signal collected by an external electrode connected to the main control board through the serial communication output interface.

9. The anesthesia depth monitor according to claim 8, characterized in that: It also includes a signal switching unit, which is arranged on the common end of the serial communication data line connecting each parameter board and the main control board, and is used to select one of the parameter boards to connect to the main control board.

10. The anesthesia depth monitor according to claim 9, characterized in that: Each of the parameter boards is independently shielded and packaged.

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