CN210541550U

CN210541550U - Visual evoked potential detection device based on VR head display

Info

Publication number: CN210541550U
Application number: CN202020527160.2U
Authority: CN
Inventors: 周志明; 张�林
Original assignee: Chengdu Techman Software Co Ltd
Current assignee: Chengdu Techman Software Co Ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2020-05-19
Anticipated expiration: 2030-04-13

Abstract

The utility model discloses a visual evoked potential detection device based on VR head display, which comprises a wearable VR head display device, an acquisition device, a signal processing terminal and a synchronous interface, wherein the VR head display device is electrically connected with the acquisition device, and the acquisition device sends a square wave driving signal for switching the device picture to the VR head display device through the synchronous interface; the signal processing terminal is electrically connected with the acquisition equipment, issues a control instruction to the acquisition equipment, and simultaneously receives a visual evoked potential signal sent by the acquisition equipment and performs data processing and display. According to the scheme, the accuracy of visual evoked potential signal acquisition can be improved, the peak staggering of the superposition average is avoided, the evoked potential quality is improved, and the complexity of the use of the visual evoked potential detection device is reduced.

Description

Visual evoked potential detection device based on VR head display

Technical Field

The utility model relates to a biomedical engineering and computer interaction field especially relate to a visual evoked potential detection device based on VR head shows.

Background

Visual evoked potential (visual evoked potential) electrophysiological phenomena, which stimulates the retina with a flash of light or a pattern of a certain intensity in the visual field range and can record potential changes in the visual cortex or the occipital region outside the skull, is one of the important means for studying human sensory functions, nervous system diseases, behaviors, psychological activities, and the like. Visual Evoked Potentials (VEPs) can be used to understand the functional integrity of the entire visual pathway from the retina to the visual cortex, stimulate the vision of the left and right eyes separately by switching the display mode in a specific checkerboard manner, record evoked potentials (P100) in the visual cortex, analyze the level of the pathway lesions in the retina before and after the visual cross according to the P100 latency and amplitude, and make objective assessments of the extent of the lesions, the therapeutic effect and the prognosis.

Conventional visual evoked potential monitoring devices first require a dark room of less than 4 square meters. A computer is arranged in the device, the computer requires two displays, one of the two displays is used for being watched by a subject, and the head of the subject is kept at a distance of about 1 meter from the display so as to ensure a viewing angle of more than 8 degrees; the other display is operated, observed and data recorded by the operator. When the test is started, the computer which is watched by the testee and controlled by the testee computer switches the display stimulation pattern (such as a checkerboard) at a certain fixed frequency, and the signal collector is used for recording the potential change of the occipital region outside the skull, and generally continuously recording for 30 s. Since the recorded potential signal is only an electrical signal of ten-odd microvolts and is also mixed with other brain and electrocardio, the potential changes recorded in many times are generally superimposed with the image switching time as a boundary, and the resulting induced potential waveform with high signal-to-noise ratio is generally obtained by averaging several tens of times of the superimposed potential waveforms (hereinafter referred to as a superimposed average method).

The disadvantages of this set of devices are the following:

firstly, the whole set of the device is developed in a special darkroom, and meanwhile, the connection of the matched equipment is complicated. It is not beneficial to develop the experiment in remote mountainous area or in small space. I.e. with high environmental requirements.

In addition, the device has certain requirements on the test at the same time, such as the head-up, and the distance is fixed to be about 1 meter. Otherwise, the ideal test effect cannot be achieved.

Secondly, when waveform superposition is carried out, because the precision of a timer of a general computer is not high, for example, in a windows system, the precision is generally 1-10 ms, and the precision can cause the front and back jitter of the superposition time, so that the wave peak of each electroencephalogram evoked potential can not be superposed with the wave peak time, namely, the peak is staggered, and the latent period is inaccurate or the amplitude value of the evoked potential is not large enough.

Thirdly, the recording electrode of the occipital region outside the skull needs to be installed singly, so that the complexity of product use is improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's is not enough, provides one kind not restricted by the environment, and convenient to use, evoked potential signal acquisition accuracy is high, can avoid the average calculation process of stack VR wear-type vision evoked potential collection system that the peak shift appears.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a visual evoked potential detection device based on VR head shows, includes the first equipment that shows of wearable VR, collection equipment, signal processing terminal 12, VR head show equipment with collection equipment electric connection, signal processing terminal 12 with collection equipment electric connection receives the visual evoked potential signal that collection equipment sent and carries out data processing and demonstration.

Wherein, the VR head display equipment comprises a vision induction response helmet 14, a vision stimulation device, a recording electrode and a VR head display lacing tape 3, and the vision stimulation device is arranged on the vision induction response helmet 14; the recording electrode is arranged at a physiological potential recording position on the visual evoked response helmet 14; the VR headband 3 is disposed at two ends of the helmet 14 for fixing the helmet 14 to the head of the subject.

Specifically, the visual stimulation device comprises a display screen 15, a display screen built-in frame 1 and a function control button 8, wherein the display screen 15 is divided into a left eye area and a right eye area which are arranged in the display screen built-in frame 1; the function control buttons 8 are used for controlling the display mode of the left eye area and the right eye area of the display screen 15 and are arranged outside the display screen built-in frame 1.

Specifically, the recording electrodes comprise a forehead recording electrode 2, an occipital recording electrode 4 and an ear clip recording electrode 6, and the forehead recording electrode 2 is arranged at the forehead position of the visual evoked response helmet 14; the occipital bone recording electrode 4 is arranged at the occipital bone position of the vision induction reaction helmet 14; the ear clip recording electrodes 6 are provided at ear positions on both sides of the visual evoked response helmet 14.

Specifically, the VR head display device further comprises a recording electrode bundle 5, and a forehead recording electrode wire, an occipital recording electrode wire, an ear clip recording electrode wire and an external power line are integrated in the recording electrode bundle.

The acquisition equipment comprises an acquirer 10 and an acquirer recording interface 9, wherein the acquirer 10 is connected with the recording electrode bundle 5 through the acquirer recording interface 9 and receives a visual evoked potential signal acquired and recorded by VR head display equipment.

Further, the acquisition device sends the acquired and recorded visual evoked potential signal to the signal processing terminal 12 through the communication cable 13, or receives an instruction issued by the signal processing terminal 12.

Further, the device also comprises a synchronous control input interface 7, a synchronous control output interface 11 and a synchronous cable, wherein the synchronous control input interface 7 is arranged on the visual evoked response helmet 14; the synchronous control output interface 11 is arranged on the collector 10; the synchronous control input interface 7 is connected with the synchronous control output interface 11 through the synchronous cable to form a signal synchronous circuit.

The utility model has the advantages that:

1. the use restriction on the testee is reduced without darkroom test conditions, and the complexity of the use of the device is reduced by wearing the device in place in one step;

2. the relative accuracy of the time between the moment of image switching and the moment of occurrence of the evoked potential is ensured, and the phenomenon of peak staggering is avoided;

3. the accuracy of the latency period and the amplitude of the evoked potential are greatly improved, and meanwhile, the quality of the evoked potential is improved.

Drawings

Fig. 1 is a schematic view of the structure of the device of the present invention.

Fig. 2 is an overall connection diagram of the present invention.

Fig. 3 shows the original square stimulation pattern of the present invention.

FIG. 4 shows the barrel-shaped transformed stimulation pattern of the present invention

In fig. 1: 1-display screen built-in frame, 2-forehead core recording electrode, 3-VR head display binding band, 4-occipital bone recording electrode, 5-recording electrode bundle, 6-ear clip recording electrode, 7-synchronous control input interface, 8-function control button, 9-collector recording interface, 10-collector, 11-synchronous control output interface, 12-signal processing terminal, 13-communication cable, 14-vision induction reaction helmet and 15-display screen.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

In this embodiment, as shown in fig. 1-2, a visual evoked potential detection apparatus based on a VR head display includes a VR head display device adopting a wearable design, a collection device, and a signal processing terminal 12, where the VR head display device is electrically connected to the collection device, and the signal processing terminal 12 is electrically connected to the collection device, and receives a collected visual evoked potential signal and performs data processing and display.

Wherein, the VR head display equipment comprises a vision induction reaction helmet 14, a vision stimulation device, a recording electrode and a VR head display lacing tape 3. The visual stimulation device is disposed on the visual evoked response helmet 14 for generating a visual stimulation image. The recording electrode is used for recording the visual evoked potential signal of the testee and comprises a forehead recording electrode 2, an occipital recording electrode 4 and an ear clip recording electrode 6, wherein the forehead recording electrode 2 is arranged at the forehead position of the visual evoked response helmet 14 and is used for collecting the physiological potential change of the forehead leaf of the testee; the occipital recording electrode 4 is arranged at the occipital position of the visual evoked response helmet 14 and is used for collecting physiological potential signals of the occipital position of the head of the subject; the ear clip recording electrodes 6 are arranged at the ear positions at the two sides of the visual evoked response helmet 14, and collect physiological potential signals of the ear positions at the two sides of the head of the subject. The VR headband 3 is disposed at both ends of the helmet 14 for fixing the helmet 14 to the head of the subject. The VR head display device is of an integrated design, and integrates the visual stimulation device and the recording electrode on the reaction helmet 14, thereby providing the darkroom condition required by the traditional detection device, and reducing the use restriction of the testee and the use complexity of the detection device.

Specifically, the visual stimulation device in the VR head display equipment comprises a display screen 15, a display screen built-in frame 1 and a function control button 8, wherein the display screen 15 can be observed by left and right eyes respectively. The display screen is divided into a left eye area and a right eye area, visual stimulation images with set rules or frequencies can be respectively generated in the two visual field sectors to stimulate the vision of the left eye and the right eye and induce the potential change of the cerebral cortex, and the display screen 15 is arranged in the display screen built-in frame 1. The function control button 8 is used for controlling display modes of left and right eye areas of the display screen 15, the display modes comprise synchronous display, left eye independent display, right eye independent display and the like, and the function control button 8 is arranged outside the built-in frame 1 of the display screen. The visual stimulus pattern observed by the traditional human eyes is shown in fig. 3, and the original stimulus pattern needs to be arranged on a flat display which is approximately one meter away from the head of the subject during the test, so the test is very inconvenient. Therefore, the original square stimulation pattern shown in fig. 4 is formed after the barrel-shaped transformation of the original square stimulation pattern shown in fig. 3 and displayed on the display screen 15, and is restored to the original square stimulation pattern through the lens group arranged in the visual evoked response helmet 14, so that the original one-meter external observation mode of the flat panel display is replaced. The barrel-shaped transformed stimulation patterns include a stimulation pattern AA and a stimulation pattern BB, and when the synchronous display test is performed, the stimulation pattern AA and the stimulation pattern BB are alternately and alternately displayed on the display screen 15 according to a set frequency. In addition, when the left and right eye independent display test is performed, the stimulation pattern AA and the stimulation pattern BB can be alternately displayed on the left eye area and the right eye area of the display screen 15 independently. After the barrel-shaped transformation is carried out on the original square stimulation pattern, the distortion phenomenon of the display screen when the original square stimulation pattern is displayed can be avoided, and therefore the acquisition quality and accuracy of the visual evoked potential are improved.

The VR head display equipment further comprises a recording electrode bundle 5, wherein a forehead core recording electrode wire, an occipital bone recording electrode wire, an ear clip recording electrode wire and an external power line are integrated in the recording electrode bundle, so that the excessive cables are avoided, and the complexity of connecting the visual evoked potential acquisition equipment is reduced.

Wherein, the collection equipment comprises a collector 10 and a collector recording interface 9. The collector is connected with the recording electrode bundle 5 through a collecting and recording interface 9 and receives the visual evoked potential signals collected and recorded by the VR head display equipment. The acquisition device also sends the acquired and recorded visual evoked potential signals to the signal processing terminal 12 through the communication cable 13, or receives the instruction sent by the signal processing terminal 12.

The signal processing terminal 12 may send an instruction for acquiring a visual evoked potential signal to the collector 10, and after receiving the instruction, the collector 10 sends a square wave signal from a set synchronous interface to start the visual evoked potential detection. After receiving the visual evoked potential signals uploaded by the collector 10, the terminal processes the signals by a superposition average method and displays the signals on the terminal.

The visual evoked potential monitoring device further includes a synchronization control input interface 7, a synchronization control output interface 11, and a synchronization cable. The synchronous control input interface 7 is arranged on the visual evoked response helmet 14; the synchronous control output interface 11 is arranged on the collector 10; the synchronous control input interface 7 is connected with the synchronous control output interface 11 through a synchronous cable to form a signal synchronous circuit, and the cable transmits a square wave driving signal synchronous with the picture switching of the display screen. When the rising edge of the square wave appears on the synchronous cable, the display screen 15 can display the stimulation pattern AA, and when the falling edge of the square wave appears, the display screen 15 can display the stimulation pattern BB. The design of the synchronous interface ensures that the switching and the recording of the stimulation images are all sent by the collector 10 in a unified way, thereby ensuring the relative accuracy of the time between the moment of image switching and the moment of occurrence of the evoked potential and avoiding the occurrence of peak staggering phenomenon. Thereby greatly improving the accuracy of the latent period and the amplitude of the evoked potential.

In this embodiment, a usage flow of the visual evoked potential monitoring apparatus based on VR head display is specifically as follows:

the display mode of the display screen 15 is adjusted to a suitable state, such as a single left eye mode, a black and white grid mode and the like, through the functional test button 8 according to the test requirement. The subject wears the visual evoked response helmet 14, tightens the helmet through the VR head band 3, and ensures good contact between the forehead core recording electrode 2 and the occipital bone recording electrode 4, which can be coated with medical conductive paste. The ear clip recording electrode 6 is coated with a medical conductive paste and clipped to the ear lobe of the subject. The recording of the visual evoked potential signals is started by click confirmation in the signal processing terminal 12, which issues instructions to the acquirer 10 through the communication cable 13. After receiving the instruction, the collector 10 starts to collect and record the potential signal from the collection and recording interface 9, and simultaneously outputs a continuous square wave signal from the synchronous control output interface 11, and transmits the continuous square wave signal to the synchronous control input interface 7 of the visual evoked response helmet through a synchronous cable. When the visual evoked response helmet 14 receives the rising edge of the square wave signal, the display screen 15 will display the stimulation image AA, and when the falling edge of the square wave signal is received, the display screen 15 will display the stimulation image BB. At the moment, the three recording electrodes of the helmet acquire visual evoked potential signals, and transmit the acquired and recorded signals to the acquisition and recording interface 9 through the recording electrode bundle 5, and the collector 10 receives the signals through the acquisition and recording interface 9 and uploads the signals to the signal processing terminal 12 for analysis. And maintaining the electric potential signal acquisition process for about 30 seconds. The waveform of the visual evoked potential signal recorded in the signal processing terminal 12 is divided at the rise or fall time of the square wave, and the final visual evoked potential is obtained by the superposition averaging method.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The visual evoked potential detection device based on VR head display is characterized by comprising a wearable VR head display device, a collection device and a signal processing terminal (12), wherein the VR head display device is electrically connected with the collection device, and the signal processing terminal (12) is electrically connected with the collection device, receives a visual evoked potential signal sent by the collection device, and performs data processing and display.

2. The apparatus of claim 1, wherein the VR headset comprises a visual evoked response helmet (14), a visual stimulation device, a recording electrode, a VR headset strap (3), the visual stimulation device is disposed on the visual evoked response helmet (14); the recording electrode is arranged at a physiological potential recording position on the visual evoked response helmet (14); the VR head-display lacing tapes (3) are arranged at two ends of the visual induction reaction helmet (14).

3. The VR head-display-based visual evoked potential detection device of claim 2, wherein the visual stimulation device comprises a display screen (15), a display screen built-in frame (1) and a function control button (8), the display screen (15) is divided into a left eye area and a right eye area, and the left eye area and the right eye area are arranged in the display screen built-in frame (1); the function control button (8) is used for controlling the display mode of the left eye area and the right eye area of the display screen (15) and is arranged outside the display screen built-in frame (1).

4. The VR headset-based visual evoked potential monitoring device of claim 2, wherein the recording electrodes include a forehead recording electrode (2), an occipital recording electrode (4), and an ear clip recording electrode (6), the forehead recording electrode (2) is disposed at a forehead position of the visual evoked response helmet (14); the occipital bone recording electrode (4) is arranged at the occipital bone position of the visual induction reaction helmet (14); the ear clip recording electrodes (6) are arranged at the ear positions at both sides of the visual evoked response helmet (14).

5. The apparatus of claim 2, wherein the VR head display device further comprises a recording electrode bundle (5), and a forehead recording electrode wire, an occipital recording electrode wire, an ear clip recording electrode wire, and an external power line are integrated in the recording electrode bundle (5).

6. The apparatus of claim 2, wherein the collecting device comprises a collector (10) and a collector recording interface (9), the collector (10) is connected to the recording electrode bundle (5) through the collector recording interface (9) and receives the visual evoked potential signal collected and recorded by the VR head display device.

7. The VR head-display-based visual evoked potential detection apparatus of claim 6, wherein the collection device further sends a recorded visual evoked potential signal to the signal processing terminal (12) through a communication cable (13), or receives a command issued by the signal processing terminal (12).

8. The VR head-display-based visual evoked potential monitoring device of claim 6, further comprising a synchronous control input interface (7), a synchronous control output interface (11), and a synchronous cable, wherein the synchronous control input interface (7) is disposed on the visual evoked response helmet (14); the synchronous control output interface (11) is arranged on the collector (10); the synchronous control input interface (7) is connected with the synchronous control output interface (11) through a synchronous cable to form a signal synchronous circuit.