A multi-modal signal acquisition eye mask for clinical consciousness detection

Abstract

The present invention belongs to the technical field of medical devices, and discloses a multi-modal signal acquisition eye mask for clinical consciousness detection, including: a fixing ring for wearing, and a light-shielding cover arranged on the fixing ring; a battery compartment and a flexible light-shielding pad are arranged inside the light-shielding cover; a pair of eyelid retractors are arranged on the side of the light-shielding cover close to the eyes; the flexible light-shielding pad is arranged around the pair of eyelid retractors; the eyelid retractor includes a cylindrical support tube, a telescopic driver for driving the support tube to expand and contract, an eyeball camera, and an illumination light strip. The end face of the support tube on the side close to the eyes is in the shape of a concave spherical surface, and the eyeball camera and the illumination light strip are arranged in the support tube. After the support tube extends and fits with the eyelid and then moves slightly along the axis direction of the cylinder, the patient's eyelid can be opened. The eye images captured by the eyeball camera can be processed by the information preprocessing unit to obtain the eye movement trajectory, eye movement time, average speed time and distance of saccade direction, pupil size and blink information of the subject.

Description

Technical Field

[0001] The invention belongs to the field of medical devices, and mainly relates to an eye mask for clinical consciousness detection. Background Art

[0002] The pupil reflex is a physiological reaction that changes the size of the pupil through the contraction of the iris muscle. The pupil's reaction to light causes the pupil to shrink, which is called the pupil reflex to light. The transmission pathways of the pupil reflex to light include: light, retina, optic nerve, optic chiasm, optic tract, midbrain anterior tegmental area, bilateral EW nuclei, oculomotor nerve, ciliary ganglion, postganglionic fibers and pupillary sphincter. The main function of the pupil is to adjust and maintain the right amount of light entering the eye to obtain the clearest image of the object falling on the retina; control the light to prevent excessive light from burning the retina; control the intensity of light entering the eye to protect the eye. When the light shines on the pupil of a patient with normal consciousness, the pupil will shrink reflexively. When the light moves, the eyeball will also move with the position of the light. When the light moves away, the pupil will return to normal size. If the patient's pupil reflex to light disappears or weakens, it generally indicates that the optic nerve is damaged. In addition, the changes in the pupil reflex to light and the temporal and spatial characteristics of eye movement are physiological and behavioral manifestations in the process of visual information extraction in the human brain, and have a direct or indirect relationship with human psychological activities. The pupillary sphincter and pupil dilator muscles that adjust the pupil diameter are controlled by the parasympathetic and sympathetic nerves; eye movements also rely on the coordinated activities between multiple levels of neural control centers such as the cerebral cortex, subcortex, brainstem nuclei, and thalamus. Therefore, changes in pupil light reflex and the temporal and spatial characteristics of eye movements are two important signs that reflect the state of consciousness. Therefore, through changes in pupil light reflex and the temporal and spatial characteristics of eye movements, it is possible to determine whether the patient's visual conduction pathway system and some low-level intermediate visual areas of the midbrain are damaged, so as to make a preliminary judgment on the patient's state of consciousness.

[0003] Since the eyes of clinical patients in a coma or minimally conscious state are generally closed, assistant doctors need to open the patient's eyelids for light stimulation to observe pupil changes. This examination process is not convenient and affects work efficiency. In addition, when the eyelids of patients in a coma or minimally conscious state are manually opened, eye movement information cannot be recorded by wearing an eye tracker, which in turn affects the collection of eye movement information by the clinical consciousness assessment system. Summary of the invention

[0004] The present invention aims at solving the technical problems mentioned in the background technology and provides a multimodal signal acquisition eye mask for clinical consciousness detection, which adopts the following technical solutions:

[0005] A multimodal signal acquisition eye mask for clinical consciousness detection, comprising: a fixing ring for wearing, and a light shielding cover arranged on the fixing ring; a battery compartment and a flexible light shielding pad are arranged inside the light shielding cover;

[0006] A pair of eyelid retractors are arranged on the side of the light shield close to the eye; a flexible light-shielding pad is arranged around the pair of eyelid retractors;

[0007] The eyelid retractor includes a pair of support cylinders symmetrically placed up and down in a semi-circular shape, a telescopic driver for driving the support cylinder to expand and contract, an eyeball camera, and an illumination light strip. The end faces of the pair of support cylinders symmetrically placed up and down on the side close to the eye are concave spherical surfaces, and the eyeball camera and the illumination light strip are arranged in the support cylinder.

[0008] In this application, the flexible light-shielding pad, the end face of the support cylinder on the side close to the eye, and the material of the part of the fixing ring in contact with the wearer's skin during use are preferably made of flexible materials such as silica gel, rubber, sponge, and TPU. The flexible light-shielding pad is made of flexible material, which can not only block light but also adapt to the different face shapes of different patients to achieve the purpose of comfortable wearing; the end face of the support cylinder on the side close to the eye contacts the eyelid, and being made of flexible material can adapt to different wearers and protect the eyelid. The fixing ring is preferably configured as a magic tape strap; the pair of support cylinders placed symmetrically up and down in a semi-circular shape are assembled and connected through a rotatable connecting shaft so that the pair of support cylinders placed symmetrically up and down in a semi-circular shape can perform an up-and-down opening and closing action.

[0009] The semi-circular support cylinder is driven by a telescopic driver to extend to the eyelid. The concave spherical end face formed by the pair of support cylinders up and down makes it easy to fit the shape of the eyeball. After the end face of the support cylinder fits the eyelid, a slight movement along the axis direction of the end face can open the patient's eyelid. By photographing the 3D information of the patient's eye movement and the eye images when different light stimuli are applied by the illumination light strip, the eye movement trajectory, eye movement time, average speed time and distance of the saccade direction, pupil size and blink information of the subject can be obtained.

[0010] A pressure sensor is arranged at the end of the semi-circular support cylinder on the side close to the eye; the pressure signal output by the pressure sensor is fed back to the telescopic driver and is used to control the switch of the telescopic driver. After the eye mask device is worn, under the drive of the telescopic driver, the support cylinder automatically extends to fit the human eye, and the pressure sensor stops extending immediately after detecting contact with the human body. For example, when the telescopic driver is started and the support cylinder extends towards the eyeball, when the pressure value reaches the set threshold of 0.01 - 0.05 N, the extension automatically stops to ensure the safety of the patient's eyes.

[0011] The semi-circular support cylinder is composed of an inner support cylinder and an outer support cylinder. The inner support cylinder and the outer support cylinder are coaxially arranged, and the length of the inner support cylinder is less than that of the outer support cylinder. The space between the inner support cylinder and the outer support cylinder is filled with a flexible filling layer.

[0012] Furthermore, the telescopic drive is composed of a spiral lifting device driven by a micro-stepping motor, and the micro-stepping motor drives and controls the spiral lifting device to drive the support tube to move up and down, thereby realizing the control of the lifting position of the support tube.

[0013] Furthermore, the semi-lunar support tube is composed of a support inner tube and a support outer tube, and the end faces of the support inner tube and the support outer tube are sealed by an elastic membrane; the support inner tube, the support outer tube and the elastic membrane together constitute an airbag structure, and after the airbag structure is inflated, the support inner tube is coaxial with the support outer tube, and the length of the support inner tube is smaller than the length of the support outer tube, and the elastic membrane is in the shape of a concave spherical surface; the telescopic drive is composed of a mechanical compression pump device, and the mechanical compression pump is used to inflate and pump air into the airbag structure to drive the telescopic movement of the support tube.

[0014] The inner support tube and the outer support tube are made of organic polymer flexible materials such as silicone and rubber with a certain strength. At the same time, the flexible filling layer is sandwiched between the outer support tube and the inner support tube. It is made of highly flexible sponge, silicone and other materials or an inflatable airbag that can provide a better physical experience when it fits with the human body. Since all parts of the support tube are made of flexible materials, the purpose of comfort and helping to open the eyelids is achieved. In addition, the flexible concave spherical structure formed by the end face of the middle flexible filling layer is easier to fit with the spherical eyeball, and when the support device is extended outward to open the human eyelid, it can effectively reduce the force applied to the eyeball and play a role in protecting the human eye.

[0015] The battery compartment is used to install a power source and provide electrical energy to the telescopic drive, eyeball camera, and lighting strip.

[0016] Furthermore, the lighting light strip includes: one of an LED backlight source, an OLED backlight source, and a liquid crystal backlight system; the light frequency, light intensity, and flickering mode of the lighting light strip are all configured to be adjustable. The lighting light strip provides a good lighting environment for the eye camera, and the light frequency, light intensity, and flickering mode of the lighting light strip can be adjusted. Through different lighting light strip illumination modes, more types of consciousness assessment tests can be performed to improve the accuracy of consciousness assessment.

[0017] The diameter of each small light-emitting unit in the lighting light band ranges from 100μm to 700μm. The small light-emitting diameter ensures the continuity of the light band lighting and can achieve more lighting modes. The light-emitting wavelength of the light-emitting unit ranges from 300nm to 650nm, and the total brightness of the lighting light band ranges from 600ld / m 2 -1000ld / m 2 This lighting strip can simulate sunlight stimulation, strong light and shallow consciousness level judgment, and comfortable low light environment for the eyes.

[0018] Furthermore, the illumination light band is arranged around the inner side wall of the support cylinder. The angle of each light-emitting area in the illumination light band is 20° - 100°, and the light-emitting area rotates clockwise or counterclockwise at a speed of 5° - 20° per second, with a flicker frequency of 0Hz - 5Hz. This light-emitting mode of the light band can cause the eyes to automatically follow, which is better for judging the conscious state of clinical patients. By observing the eye information of patients under different light-emitting modes, a more accurate judgment of the conscious state of clinical patients can be achieved.

[0019] The fixed ring is equipped with bilateral temporal lobe electrodes and bilateral occipital lobe electrodes; the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are used to receive EEG signals; the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes jointly output four-channel electroencephalogram signals.

[0020] The bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are configured as snap electrodes or replaceable dry and wet electrodes.

[0021] A better solution is that an information preprocessing unit is configured on the fixed ring; the eye images output by the eye camera and the four-channel electroencephalogram signals output by the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are both transmitted to the information preprocessing unit. The information preprocessing unit is used for preprocessing the eye images and electroencephalogram information.

[0022] Furthermore, the preprocessing process of the eye images in the information preprocessing unit is as follows: First, perform 2D image denoising algorithm processing on the images captured by the eye camera, perform image denoising on the eye movement pictures obtained by the eye camera, and then obtain the position information of the pupil center in the three-dimensional space of the eyeball and the recorded pupil distance size through the adaptive target tracking algorithm and the pupil center distance pattern matching algorithm; obtain the eye movement trajectory and eye movement time according to the position changes of the eyeball in the three-dimensional space at different times; take the derivative of the position changes of the eyeball in the relevant three-dimensional space with respect to time to obtain the movement direction and speed of saccades.

[0023] Furthermore, the preprocessing process of the electroencephalogram information in the information preprocessing unit includes four steps: signal amplification, smoothing filtering, band-pass filtering, and analog signal sampling; specifically: first, amplify the obtained microvolt-level electroencephalogram signals by 100 - 1000 times to the millivolt level, eliminate external noise interference through a smoothing filter with a time width of 0.01 - 0.05 milliseconds, select the target information in the electroencephalogram frequency band through a band-pass frequency selection filter with a cut-off frequency of 0.5 - 100Hz, and finally obtain the preprocessed four-channel electroencephalogram signals with a digital frequency of 200 - 1500Hz through analog signal sampling.

[0024] Further, after the eye image preprocessing and EEG information preprocessing, the information preprocessing unit further includes a signal merging and compression processing flow. The multi-modal information obtained through the eye image preprocessing and EEG information preprocessing is convenient for high-speed data transmission and data acquisition with higher frequency and higher precision after being merged and compressed. The specific signal merging and compression processing flow is as follows: First, merge the preprocessed four-channel EEG signals obtained from the EEG information preprocessing and the eye information such as the pupil distance, the eye movement trajectory and eye movement time, and the movement direction and speed of saccades obtained from the eye image processing process; then, through the LZSS compression algorithm, compress the data size to 50% - 70% of the original data, reducing the space occupied by signal storage, transmission, and analysis.

[0025] Further, a data transmission unit and a data receiving terminal are configured on the fixing ring; the data transmission unit is used to transmit the signals output from the information preprocessing unit to the data receiving terminal, and there is a two-way communication connection between the data transmission unit and the data receiving terminal. The data receiving terminal can send a test instruction to the data transmission unit, and the data transmission unit can also upload the eye image preprocessing and EEG information preprocessing information to the data receiving terminal.

[0026] The data transmission method of the data transmission unit is wireless transmission or wired transmission. Further, the wireless transmission methods include one of Bluetooth transmission, infrared transmission, WLAN transmission, and LTE transmission.

[0027] A power supply with a voltage of 4 - 8V is set in the battery compartment, and it can be charged by connecting to an external charging cable or powered by 2 - 4 No. 5 batteries.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] When the data transmission unit receives an external test instruction, the eyelid opener is moved up and down by the telescopic driver, which can automatically open the patient's eyelids, realizing the automatic extraction of the patient's eye information in a clinical unconscious state, saving labor for hospital doctors.

[0030] By adjusting the light brightness and intensity, the size of the light-emitting area in the light band, and the light-emitting mode, the lighting light band can perform various light stimulations on the patient, and then observe the patient's eye feedback condition. Combining various stimulation conditions with the patient's eye feedback can enhance the accuracy of analyzing the conscious state of clinical patients.

[0031] The bilateral temporal lobe electrodes and bilateral occipital lobe electrodes can extract the human EEG signals, and there is also a high correlation between the human EEG signals and the human conscious state. By testing the brain activities of two brain regions through 4 electrodes, the accuracy of analyzing the conscious state of clinical patients can be enhanced.

[0032] The information preprocessing unit can compress the extracted human-related signal information, reduce the traffic required in signal transmission and the electrical energy consumed by the transmission, and improve the available monitoring time of the eye mask.

[0033] The device is powered by a battery compartment, without the need for an external power supply and is not restricted by the surrounding environment. The data transmission unit selects a wireless transmission method for data reception and transmission, enabling remote monitoring of clinical patients. Description of the Drawings

[0034] Figure 1 Schematic diagram of the appearance of the multi-modal signal acquisition eye mask in Embodiment 1;

[0035] Figure 2 Schematic diagram of the appearance of the multi-modal signal acquisition eye mask in Embodiment 2;

[0036] Figure 3 Side view schematic diagram of the multi-modal signal acquisition eye mask in Embodiment 2;

[0037] Figure 4 Internal view schematic diagram of the multi-modal signal acquisition eye mask in Embodiment 2;

[0038] Figure 5 Top view schematic diagram of the semi-circular upper and lower symmetric support cylinder device in Embodiment 2;

[0039] Figure 6 Assembly connection schematic diagram between the support cylinders;

[0040] Figure 7 Schematic diagram of the semi-circular upper and lower symmetric support cylinder assembled with an air cushion in Embodiment 3;

[0041] Figure 8 Schematic diagram of the semi-circular upper and lower symmetric support cylinder assembled with an air ring in Embodiment 3;

[0042] Figure 9 Schematic diagram of the eyelid retractor in Embodiment 4;

[0043] Wherein: 1. Fixed ring; 2. Bilateral temporal lobe electrodes; 3. Bilateral occipital lobe electrodes; 4. Data transmission unit; 5. Flexible filling layer; 6. Inner support cylinder; 7. Outer support cylinder; 8. Eyeball camera; 9. Battery compartment; 10. Telescopic driver; 11. Information preprocessing unit; 12. Illumination light strip; 13. Light-shielding cover; 14. Flexible light-shielding pad; 16. Eyelid retractor; 17. Semi-circular support cylinder; 18 is a rotatable connecting shaft; 19 is an air cushion; 20 is an air ring; 21 is an elastic flap. Detailed Embodiments

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0045] Example 1

[0046] A multi-modal signal acquisition eye mask for clinical consciousness detection, as Figure 1 shown, includes: a fixing ring 1 for wearing, and a light-shielding cover 13 arranged on the fixing ring; a battery compartment and a flexible light-shielding pad 14 are arranged inside the light-shielding cover;

[0047] A pair of eyelid retractors 16 are arranged on the side of the light-shielding cover close to the eyes; the flexible light-shielding pad is arranged around the pair of eyelid retractors;

[0048] The eyelid retractor includes a semi-circular support cylinder 17 that is symmetric up and down, a telescopic driver for driving the support cylinder to expand and contract, an eyeball camera 8, and an illumination light strip. The end face of the support cylinder on the side close to the eyes is in the shape of a concave spherical surface, and the eyeball camera and the illumination light strip are arranged in the support cylinder; the semi-circular support cylinder is composed of a support inner cylinder and a support outer cylinder made of elastic material, and the end faces of the support inner cylinder and the support outer cylinder are sealed by an elastic membrane; the support inner cylinder, the support outer cylinder, and the elastic membrane together form an airbag structure. After the airbag structure is inflated and expanded, the support inner cylinder and the support outer cylinder are coaxial, the length of the support inner cylinder is less than the length of the support outer cylinder, and the shape of the elastic membrane is a concave spherical surface; the semi-circular support cylinders placed symmetrically up and down are assembled and connected through a rotatable connecting shaft;

[0049] The telescopic driver is composed of a mechanical compression pump device. The telescopic movement of the support cylinder is driven by inflating and deflating the airbag structure through the mechanical compression pump; pressure sensors are arranged at the ends of the pair of support cylinders on the side close to the eyes; the pressure signals output by the pressure sensors are fed back to the telescopic driver and used to control the switch of the telescopic driver.

[0050] The process of opening the eyelids by the semi-circular eyelid retractor is as follows. When a clinical patient wears the eye mask and the eye mask receives a detection instruction, a pair of flexible semi-circular support cylinders are driven by the telescopic driver to gradually extend towards the eyelids until they extend to the eyelids, and the airbag between the end faces of the support inner cylinder and the support outer cylinder is inflated by the mechanical compression pump. After the end face of the support cylinder on the side close to the eyes contacts the eyelids, the elastic membrane continues to inflate and expand, causing the semi-circular support cylinders arranged symmetrically up and down to open upwards and downwards. Driven by the elastic membrane, the eyelids move along the curvature of the eyeball towards the orbit direction, thereby realizing eyelid opening. When the pressure sensor on the semi-circular support cylinder reaches the set threshold, the patient is already in an open-eye state, and the inflation is stopped, realizing automatic eyelid opening for unconscious patients.

[0051] Example 2

[0052] A multi-modal signal acquisition eye mask for clinical consciousness detection based on Example 1, as Figures 2 to 5 shown, includes: a fixing ring 1 for wearing, and a light-shielding cover 13 arranged on the fixing ring; a battery compartment 9 and a flexible light-shielding pad 14 are arranged inside the light-shielding cover;

[0053] A pair of eyelid retractors is arranged on the side of the light shield close to the eye; a flexible light-shielding pad 14 is arranged around the pair of eyelid retractors;

[0054] The eyelid retractor includes a semi-circular upper and lower symmetric support cylinder, a telescopic driver 10 for driving the support cylinder to expand and contract, an eyeball camera 8, and an illumination light band 12. The end face formed by the upper and lower symmetric support cylinders on the side close to the eye is a concave spherical surface, and the eyeball camera 8 and the illumination light band are arranged in the support cylinder;

[0055] The semi-circular support cylinder is composed of a support inner cylinder 6 and a support outer cylinder 7. The support inner cylinder and the support outer cylinder are coaxially arranged, and the length of the support inner cylinder is slightly less than the length of the support outer cylinder. The space between the support inner cylinder and the support outer cylinder is filled with a flexible filling layer 5;

[0056] A pressure sensor is arranged at the end of the semi-circular support cylinder on the side close to the eye; the pressure signal output by the pressure sensor is fed back to the telescopic driver and used to control the switch of the telescopic driver;

[0057] A bilateral temporal lobe electrode 2 and a bilateral occipital lobe electrode 3 are assembled in the fixing ring; the bilateral temporal lobe electrode and the bilateral occipital lobe electrode are used to receive EEG signals; the bilateral temporal lobe electrode and the bilateral occipital lobe electrode jointly output four-channel electroencephalogram signals;

[0058] An information preprocessing unit 11 is arranged on the fixing ring; the eye image output by the eyeball camera and the four-channel electroencephalogram signals output by the bilateral temporal lobe electrode and the bilateral occipital lobe electrode are both transmitted to the information preprocessing unit;

[0059] A data transmission unit 4 and a data receiving terminal are arranged on the fixing ring; the data transmission unit is used to transmit the signals output by the information preprocessing unit to the data receiving terminal, and the data transmission unit and the data receiving terminal are in a two-way communication connection; the battery compartment 9 is used to install a power supply and supply electrical energy to the telescopic driver, the eyeball camera, the illumination light band, the information preprocessing unit, and the data transmission unit.

[0060] A multi-modal signal acquisition eye mask for clinical consciousness detection provided by the present invention, wherein an information preprocessing unit processes and transmits the obtained eye data and electroencephalogram (EEG) data; a flexible light-shielding pad is built in the light-shielding cover to support the part in contact with the human eye socket. The bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are snap electrodes or replaceable dry and wet electrodes. After being worn, they can directly receive EEG signals and are coupled with the contralateral unit through the information preprocessing unit to perform four-channel EEG information preprocessing. The EEG information preprocessing includes four steps: EEG signal amplification, smoothing filtering, band-pass filtering, and analog signal sampling, to obtain the processed four-channel EEG signals. The support cylinder can open the eyelids of patients who cannot open their eyes independently, capture the 3D eye movement information of the patients through an eye camera, and process the obtained eye images of the patients through the information preprocessing unit connected to the eye camera. The illumination and stimulation light band between the eye camera and the automatically retractable support inner cylinder serves as a light-emitting unit for providing light stimulation to the eyes and provides a good illumination environment for the eye camera. The information preprocessing unit is powered by a power supply, is connected to the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes to obtain four-channel EEG signals, and is also connected to the eye camera to obtain human eye movement signals; among them, the eye image preprocessing process includes 2D image noise reduction of the eye camera, pupil center normalization matching and registration, pupil size and blink information extraction, eye movement trajectory, eye movement time, average speed time and distance extraction of saccade direction; among them, the EEG information preprocessing process includes four steps: EEG signal amplification, EEG signal smoothing filtering and noise reduction, EEG signal band-pass filtering to remove irrelevant signals, and EEG analog signal sampling, to obtain four-channel EEG preprocessing signal information. The data transmission unit is powered by a power supply, uploads the obtained compressed signals to a data receiving terminal, and the data receiving terminal evaluates the patient's consciousness state according to the received multi-modal signals, so as to realize real-time monitoring of the patient's head state.

[0061] Embodiment 3

[0062] A multi-modal signal acquisition eye mask for clinical consciousness detection, wherein the schematic assembly connection diagram between the semi-circular support cylinders symmetrically placed up and down is as Figure 6 shown, the semi-circular support cylinders arranged up and down are connected by a rotatable connecting shaft 18, and air-filled bags are arranged on the semi-circular support cylinders arranged up and down; the telescopic driver consists of a spiral lifting device driven by a micro stepping motor and a mechanical compression pump. The micro stepping motor drives and controls the spiral lifting device to drive the telescopic movement of the support cylinder; the mechanical compression pump inflates the air-filled and deflated air bag to realize the opening and closing of the semi-circular support cylinders arranged up and down. In a preferred solution, the semi-circular support cylinders symmetrically placed up and down form a conical support structure after assembly, and the cone angle is 20°-40°.

[0063] Preferably, as Figure 7As shown in the figure, the air-filled bag is configured as an air-filled pad 19, and the air-filled pad 19 is assembled at the connection gap of the semi-circular upper and lower symmetric support cylinders. The telescopic driver drives a pair of semi-circular support cylinders to extend to the eyelid. When the pressure sensor on the semi-circular support cylinder reaches the set threshold, the extension stops. At this time, the eye is in a squinting state with the eyelid half-open and half-closed. Next, the air-filled pad is inflated, and the inflation of the air-filled pad causes the head of the semi-circular support cylinder to gradually move the eyelid along the curvature of the eyeball towards the eye socket, simulating the process of manually opening the eyelid and realizing automatic eyelid opening for patients in an unconscious state.

[0064] In another preferred embodiment, as Figure 8 shown, the air-filled bag is configured as an air-filled ring 20, and the air-filled ring 20 is assembled on the inner side wall of the semi-circular upper and lower symmetric support cylinders. The telescopic driver drives a pair of semi-circular support cylinders to extend to the eyelid. When the pressure sensor on the semi-circular support cylinder reaches the set threshold, the extension stops. At this time, the eye is in a squinting state with the eyelid half-open and half-closed. Next, the air-filled ring is inflated, and the inflation of the air-filled ring causes the head of the semi-circular support cylinder to gradually move the eyelid along the curvature of the eyeball towards the eye socket, realizing automatic eyelid opening for patients in an unconscious state.

[0065] Embodiment 4

[0066] A multi-modal signal acquisition eye mask for clinical consciousness detection includes: a fixing ring for wearing, a light-shielding cover arranged on the fixing ring; a battery compartment and a flexible light-shielding pad are arranged inside the light-shielding cover; a pair of eyelid openers are arranged on the side of the light-shielding cover close to the eye; the flexible light-shielding pad surrounds the pair of eyelid openers;

[0067] The eyelid opener is as Figure 9 shown, and includes a pair of elastic paddles 21, a telescopic driver for driving the eyelid opener to expand and contract, an eyeball camera, and an illumination light strip. The openings of the pair of elastic paddles are in a herringbone shape. When in use, the telescopic driver drives the eyelid opener to extend towards the eyeball. After the pair of elastic paddles with a herringbone-shaped opening respectively contact the upper eyelid and the lower eyelid, the telescopic driver drives the eyelid opener to continue to extend slightly, and the elastic paddles are pressed and separated in the up and down directions to drive the eyelid to open.

[0068] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A multi-modal signal acquisition eye mask for clinical consciousness detection, Comprising: A fixing ring for wearing, a light-shielding cover arranged on the fixing ring; a battery compartment and a flexible light-shielding pad are arranged inside the light-shielding cover; characterized in that: A pair of eyelid retractors are arranged on the side of the light-shielding cover close to the eyes; the flexible light-shielding pad is arranged around the pair of eyelid retractors; The eyelid retractor comprises a pair of support cylinders symmetrically placed up and down in a semi-circular shape, a telescopic driver for driving the support cylinders to expand and contract, an eyeball camera, and an illumination light band. The end face shape of the support cylinder on the side close to the eyes is a concave spherical surface, and the eyeball camera and the illumination light band are arranged in the support cylinder; Pressure sensors are arranged at the ends of the pair of support cylinders on the side close to the eyes; the pressure signals output by the pressure sensors are fed back to the telescopic driver and used to control the switch of the telescopic driver; The semi-circular support cylinders are each composed of a support inner cylinder and a support outer cylinder; the support inner cylinder and the support outer cylinder are coaxially arranged, and the length of the support inner cylinder is less than the length of the support outer cylinder, and the space between the support inner cylinder and the support outer cylinder is filled with a flexible filling layer; The telescopic driver is composed of a spiral lifting device driven by a micro stepping motor, and the micro stepping motor drives and controls the spiral lifting device to drive the support cylinder to expand and contract.

2. A multi-modal signal acquisition eye mask for clinical consciousness detection, Comprising: A fixing ring for wearing, a light-shielding cover arranged on the fixing ring; a battery compartment and a flexible light-shielding pad are arranged inside the light-shielding cover; characterized in that: A pair of eyelid retractors are arranged on the side of the light-shielding cover close to the eyes; the flexible light-shielding pad is arranged around the pair of eyelid retractors; The eyelid retractor comprises a pair of support cylinders symmetrically placed up and down in a semi-circular shape, a telescopic driver for driving the support cylinders to expand and contract, an eyeball camera, and an illumination light band. The end face shape of the support cylinder on the side close to the eyes is a concave spherical surface, and the eyeball camera and the illumination light band are arranged in the support cylinder; Pressure sensors are arranged at the ends of the pair of support cylinders on the side close to the eyes; the pressure signals output by the pressure sensors are fed back to the telescopic driver and used to control the switch of the telescopic driver; The semi-circular support cylinders are composed of a support inner cylinder and a support outer cylinder, and the end faces of the support inner cylinder and the support outer cylinder are sealed by an elastic membrane; the support inner cylinder, the support outer cylinder, and the elastic membrane together form an airbag structure. After the airbag structure is inflated and expanded, the support inner cylinder and the support outer cylinder are coaxial, the length of the support inner cylinder is less than the length of the support outer cylinder, and the shape of the elastic membrane is a concave spherical surface; The telescopic driver is composed of a mechanical compression pump, and the telescopic movement of the support cylinder is driven by inflating and deflating the airbag structure through the mechanical compression pump.

3. The multi-modal signal acquisition eye mask for clinical consciousness detection according to claim 1 or 2, Characterized in that: The lighting light strip includes one of an LED backlight source, an OLED backlight source, and a liquid crystal backlight system; the light frequency, light intensity, and blinking mode of the lighting light strip are all configured to be adjustable; the diameter range of each light-emitting unit in the lighting light strip is 100μm - 700μm, the light-emitting wavelength range of the light-emitting unit is 300nm - 650nm, and the total brightness range of the lighting light strip is 600ld / m 2 - 1000ld / m 2 .

4. The multi-modal signal acquisition eye mask for clinical consciousness detection according to claim 1 or 2, Characterized in that: The illumination light band is arranged around the inner side wall of the support cylinder, the angle of each luminous area in the illumination light band is 20° - 100°, the luminous area rotates clockwise or counterclockwise at a speed of 5° - 20° per second, and the flashing frequency is 0Hz - 5Hz.

5. The multi-modal signal acquisition eye mask for clinical consciousness detection according to any one of claims 1 to 4, Characterized in that: The bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are assembled inside the fixed ring; the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are used to receive EEG signals; the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes jointly output four-channel electroencephalogram signals.

6. The multi-modal signal acquisition eye mask for clinical consciousness detection according to claim 5, characterized in that: an information preprocessing unit is configured on the fixed ring; the eye images output by the eye cameras and the four-channel electroencephalogram signals output by the bilateral temporal lobe electrodes and bilateral occipital lobe electrodes are both transmitted to the information preprocessing unit; the information preprocessing unit is used for preprocessing of eye images and preprocessing of electroencephalogram information; The eye image preprocessing process in the information preprocessing unit is as follows: first, the image captured by the camera is processed by a 2D image denoising algorithm, and then through an adaptive target tracking algorithm and a pupil center distance pattern matching algorithm, the position information of the pupil center in the three-dimensional space of the eyeball and the pupil distance size are obtained; the eye movement trajectory and eye movement time are obtained according to the position change of the eyeball in the three-dimensional space at different times; Derive the relationship between the position and time change of the eyeball in three-dimensional space to obtain the movement direction and speed of eye saccades; The electroencephalogram information preprocessing process in the information preprocessing unit includes 4 steps: signal amplification, smoothing filtering, band-pass filtering, and analog signal sampling; that is: first, the microvolt-level electroencephalogram signal obtained is amplified 100-1000 times to the millivolt level, and then the external noise interference is eliminated through a smoothing filter with a time width of 0.01-0.05 milliseconds, and the target information in the electroencephalogram frequency band is selected through a band-pass frequency selection filter with a cut-off frequency of 0.5-100 Hz. Finally, the four-channel electroencephalogram signal after preprocessing with a digital frequency of 200-1500 Hz is obtained through analog signal sampling.

7. The multi-modal signal acquisition eye mask for clinical consciousness detection according to claim 6, characterized in that: It further includes a data transmission unit and a data receiving terminal; The data transmission unit is used to transmit the signals output by the information preprocessing unit to the data receiving terminal, and a two-way communication connection is established between the data transmission unit and the data receiving terminal.

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