Extensible near-infrared equipment

Abstract

The utility model discloses extensible near-infrared equipment, which is electrically connected with an upper computer, the extensible near-infrared equipment comprises an FPGA (field programmable gate array) module, a control module and a laser acquisition module which are electrically connected in sequence, the FPGA module is used for analyzing an instruction of the upper computer and transmitting the analyzed instruction to the control module, and the laser acquisition module is used for acquiring the instruction of the upper computer and transmitting the analyzed instruction to the control module. The control module is used for controlling, selecting and switching the corresponding laser acquisition module to perform electroencephalogram data acquisition according to the analyzed instruction, the control module comprises a plurality of execution units, each execution unit comprises a shift register and a plurality of analog switches electrically connected with the shift register, the laser acquisition module comprises a plurality of acquisition units, and the analog switches are electrically connected with the shift register. The plurality of analog switches are electrically connected with the plurality of acquisition units correspondingly, according to an analyzed instruction, the shift register activates the corresponding analog switch to switch the corresponding acquisition unit to perform electroencephalogram data acquisition, a simple circuit module is adopted to realize light source switching and use, and the FPGA module is used with an upper computer to realize electroencephalogram data acquisition. And channels can be conveniently and flexibly configured.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an expandable near-infrared device. Background Art

[0002] Functional near-infrared spectroscopy (fNIRS) utilizes the absorption and scattering relationships between near-infrared light at multiple wavelengths and chromophores in brain tissue to measure changes in the concentrations of oxyhemoglobin, deoxyhemoglobin, and total hemoglobin in brain tissue under specific conditions. This information reflects neuronal activity, cellular energy metabolism, and hemodynamic indicators, assessing changes in cerebral cortical function. fNIRS has advantages such as wide applicability, insensitivity to motion artifacts, good electromagnetic compatibility, and high temporal and spatial resolution, making it highly promising for assessing brain function and disease.

[0003] Due to the need for simultaneous imaging of different brain regions and locations, near-infrared brain imaging equipment must have multi-channel detection capabilities, which requires the equipment to have multiple light sources. There are generally two approaches to the technical route of multiple light sources for near-infrared brain imaging equipment. One is to use multiple light sources in real time, modulating each light source with a different modulation frequency and demodulating it at the receiving end to distinguish between different light sources. The other is to use time-sharing, where only one light source is generated at a time, and multiple light source channels are achieved by time-sharing multiplexing each light source.

[0004] The currently commonly used light source time-division multiplexing method has the disadvantages of complex circuit implementation and control, large consistency errors in software control, and inconvenience in channel expansion. Utility Model Content

[0005] The purpose of the utility model is to propose an expandable near-infrared device in response to the technical problems existing in the background technology.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by this utility model are as follows:

[0007] An extensible near-infrared device is electrically connected to a host computer. The extensible near-infrared device includes an FPGA module, a control module, and a laser acquisition module that are electrically connected in sequence. The FPGA module is used to parse the instructions of the host computer and transfer the parsed instructions to the control module. The control module is used to control the laser acquisition module to collect electroencephalogram data according to the parsed instructions. The control module includes multiple execution units, and each execution unit includes a shift register and multiple analog switches respectively electrically connected to the shift register. The laser acquisition module includes multiple acquisition units, and the multiple analog switches are respectively electrically connected to the multiple acquisition units. Among them, according to the parsed instructions, the shift register activates the corresponding analog switch to switch the corresponding acquisition unit to collect electroencephalogram data.

[0008] Preferably, the shift register adopts a 74HC595PW shift register.

[0009] Preferably, the analog switch includes a 74HC4051PW analog switch.

[0010] Preferably, the analog switch further includes a 74HC4052PW analog switch.

[0011] Preferably, there are multiple acquisition units. The laser acquisition module includes a first laser board and multiple switch circuits electrically connected to the first laser board. The switch circuit includes a triode, a MOS tube, a first resistor, a second resistor, and a third resistor. The drain of the MOS tube is electrically connected to the first laser board. Both ends of the first resistor are respectively electrically connected to the gate and source of the MOS tube. The collector of the triode is electrically connected to the gate of the MOS tube. Both ends of the second resistor are respectively electrically connected to the base of the triode and the analog switch. Both ends of the third resistor are respectively electrically connected to the emitter of the triode and the analog switch. The emitter of the triode is grounded.

[0012] Preferably, the triode adopts an MMBT3904 triode.

[0013] Preferably, the MOS tube adopts an AO3401 MOS tube.

[0014] Preferably, the acquisition unit further includes a second laser board and multiple laser diodes, and the multiple laser diodes are respectively electrically connected to the second laser board.

[0015] The utility model has the following beneficial technical effects compared with the prior art: being electrically connected to the upper computer, the expandable near-infrared device includes an FPGA module, a control module, and a laser acquisition module that are electrically connected in sequence. The FPGA module is used to parse the instructions of the upper computer and transfer the parsed instructions to the control module. The control module is used to control and select the corresponding laser acquisition module to collect electroencephalogram data according to the parsed instructions. The control module includes multiple execution units, and each execution unit includes a shift register and multiple analog switches that are electrically connected to the shift register respectively. The laser acquisition module includes multiple acquisition units, and the multiple analog switches are respectively electrically connected to the multiple acquisition units. Among them, according to the parsed instructions, the shift register activates the corresponding analog switch to switch the corresponding acquisition unit to collect electroencephalogram data. A simple circuit module is used to realize the switching and use of light sources, and through the use of the FPGA module and the upper computer, the channels can be conveniently and flexibly configured. Description of the Drawings

[0016] Figure 1 Structural schematic of an embodiment of the utility model Figure 1 ;

[0017] Figure 2 Structural schematic of an embodiment of the utility model Figure 2 ;

[0018] Figure 3 Structural schematic of an embodiment of the utility model [[ID= nineteen]] Figure 3 ;

[0019] Figure 4 Structural schematic of the execution unit in an embodiment of the utility model;

[0020] Figure 5 Structural schematic of the laser acquisition module in an embodiment of the utility model Figure 1 ;

[0021] Figure 6 Structural schematic of the laser acquisition module in an embodiment of the utility model Figure 2 .

[0022] Reference numerals in the drawings: 100 FPGA module, 200 control module, 201 execution unit, 2011 shift register, 2012 analog switch, 300 laser acquisition module, 301 first laser board, 302 triode, 303 MOS tube, 304 first resistor, 305 second resistor, 306 third resistor, 307 second laser board, 308 laser diode. Detailed Embodiment

[0023] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or a specific connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] The following will describe in detail the specific embodiments of the present utility model with reference to the drawings.

[0027] As Figures 1 - 6 shown, the present utility model provides an expandable near-infrared device, which is electrically connected to the upper computer. The expandable near-infrared device includes an FPGA module 100, a control module 200, and a laser acquisition module 300 that are electrically connected in sequence. The FPGA module 100 is used to parse the instructions of the upper computer and transfer the parsed instructions to the control module 200. The control module 200 is used to control the laser acquisition module 300 to collect electroencephalogram data according to the parsed instructions. The control module 200 includes a plurality of execution units 201. The execution unit 201 includes a shift register 2011 and a plurality of analog switches 2012 that are respectively electrically connected to the shift register 2011. The laser acquisition module 300 includes a plurality of acquisition units. The plurality of analog switches 2012 are respectively electrically connected to the plurality of acquisition units. Among them, according to the parsed instructions, the shift register 2011 activates the corresponding analog switch 2012 to switch the corresponding acquisition unit to collect electroencephalogram data.

[0028] Refer to the attached Figure 4, in this embodiment, the shift register 2011 uses a 74HC595PW shift register, and the analog switch 2012 includes a 74HC4051PW analog switch and a 74HC4052PW analog switch.

[0029] Specifically, the 74HC595PW shift register, 74HC4051PW analog switch, and 74HC4052PW analog switch are used for switch control. The 74HC595PW shift register has 8-bit serial or parallel output functions, and the 74HC4051PW analog switch has 3-bit inputs and 8-bit outputs. Through the 74HC595PW shift register and the 74HC4051PW analog switch, a 4-16 bit decoder function can be achieved to control multiple laser switches. The acquisition unit includes multiple frequency light sources, and the 74HC4052PW analog switch is used to control the switching of multiple frequency light sources. This is based on the execution instructions of the host computer and the FPGA module 100, thereby realizing the switching and use of light sources. Of course, the 74HC4052PW analog switch is a 2-4 bit independent 2-way analog switch, and its input is connected to the common input terminal of the 74HC4051PW analog switch to jointly control the output switches of two light sources.

[0030] Furthermore, the acquisition unit includes a first laser board 301 and multiple switch circuits electrically connected to the first laser board 301. The switch circuit includes a triode 302, a MOS tube 303, a first resistor 304, a second resistor 305, and a third resistor 306. The drain of the MOS tube 303 is electrically connected to the first laser board 301. Both ends of the first resistor 304 are electrically connected to the gate and source of the MOS tube 303 respectively. The collector of the triode 302 is electrically connected to the gate of the MOS tube 303. Both ends of the second resistor 305 are electrically connected to the base of the triode 302 and the analog switch 2012 respectively. Both ends of the third resistor 306 are electrically connected to the emitter of the triode 302 and the analog switch 2012 respectively. The emitter of the triode 302 is grounded.

[0031] The triode 302 uses an MMBT3904 triode, and the MOS tube 303 uses an AO3401 MOS tube.

[0032] The acquisition unit further includes a second laser board 307 and multiple laser diodes 308, and the multiple laser diodes 308 are respectively electrically connected to the second laser board 307.

[0033] Specifically, the output signal of the 74HC4051PW analog switch is used to control the switch circuit composed of the MMBT3904 triode and the AO3401 MOS transistor. When the 74HC4051PW analog switch outputs a high-level signal to the first laser board 301, the MMBT3904 triode conducts, the gate of the AO3401 MOS transistor is grounded and conducts, and the voltage is input into the second laser board 307 and the laser diode 308, thereby generating a constant-current laser source.

[0034] The above are one or more implementation manners provided in combination with specific contents, and it is not determined that the specific implementation of the present invention is only limited to these descriptions. Any approximation or similarity to the method, structure, etc. of the present invention, or any technical deduction or replacement made under the premise of the inventive concept of the present invention, should be regarded as the protection scope of the present invention.

Claims

1. An extensible near-infrared device, electrically connected to the upper computer, characterized in that The scalable near-infrared device includes an FPGA module (100), a control module (200), and a laser acquisition module (300) that are electrically connected in sequence. The FPGA module (100) is configured to parse the instructions of the host computer and transfer the parsed instructions to the control module (200). The control module (200) is configured to control the laser acquisition module (300) to collect electroencephalogram data according to the parsed instructions. The control module (200) includes a plurality of execution units (201). The execution unit (201) includes a shift register (2011) and a plurality of analog switches (2012) respectively electrically connected to the shift register (2011). The laser acquisition module (300) includes a plurality of acquisition units. The plurality of analog switches (2012) are respectively electrically connected to the plurality of acquisition units. Wherein, according to the parsed instructions, the shift register (2011) activates the corresponding analog switch (2012) to switch the corresponding acquisition unit to collect electroencephalogram data.

2. The expandable near-infrared device according to claim 1, wherein The shift register (2011) uses a 74HC595PW shift register.

3. An expandable near-infrared device according to claim 1, characterized in that, The analog switch (2012) includes a 74HC4051PW analog switch.

4. An extensible near-infrared device according to claim 3, wherein, The analog switch (2012) further includes a 74HC4052PW analog switch.

5. An expandable near-infrared device according to claim 1, characterized in that, The acquisition unit includes a first laser board (301) and a plurality of switch circuits electrically connected to the first laser board (301). The switch circuit includes a triode (302), a MOS transistor (303), a first resistor (304), a second resistor (305), and a third resistor (306). The drain of the MOS transistor (303) is electrically connected to the first laser board (301). Both ends of the first resistor (304) are respectively electrically connected to the gate and the source of the MOS transistor (303). The collector of the triode (302) is electrically connected to the gate of the MOS transistor (303). Both ends of the second resistor (305) are respectively electrically connected to the base of the triode (302) and the analog switch (2012). Both ends of the third resistor (306) are respectively electrically connected to the emitter of the triode (302) and the analog switch (2012). The emitter of the triode (302) is grounded.

6. An expandable near-infrared device according to claim 5, wherein, The triode (302) uses an MMBT3904 triode.

7. An extensible near-infrared device according to claim 5, characterized in that, The MOS transistor (303) uses an AO3401 MOS transistor.

8. An expandable near-infrared device according to claim 5, characterized in that, The acquisition unit further includes a second laser board (307) and a plurality of laser diodes (308). The plurality of laser diodes (308) are respectively electrically connected to the second laser board (307).

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