Simulation eye for tonometer calibration and device thereof

Abstract

The invention relates to the technical field of simulated eyes, in particular to a simulated eye for tonometer calibration, which comprises a simulated eye assembly, a connecting column and a pressure detection tube, the simulated eye assembly comprises a cornea, a sclera, an iris, a vitreous body and aqueous humor which are consistent with a true eye structure, and the pressure detection tube is positioned on the rear side of the simulated eye assembly. The rear side of the pressure detection pipe is connected with a pressure gauge, the connecting column is located at the top of the simulation eye assembly, and a water inlet hole is formed in the top of the connecting column. By utilizing the gravity of the simulated eye, the simulated eye always faces the air outlet nozzle of the tonometer regardless of the change of the fixing device, so that the air outlet nozzle of the tonometer can quickly and accurately carry out air outlet pressure detection on the detection surface of the simulated eye, the angle of the simulated eye does not need to be adjusted for many times, and the detection efficiency is improved. The adjustment time is shortened, the detection result error caused by the angle deviation can be avoided, and the accuracy of the final calibration result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of simulated eyes, in particular to a simulated eye and a device thereof for calibrating an intraocular pressure meter. Background Art

[0002] Tonometer is a medical device used to measure the internal pressure of the eyeball. Intraocular pressure is a key factor in maintaining the shape and normal function of the eyeball. Too high or too low will affect the normal use of the eyeball. Too high will cause nerve damage and visual field loss, while too low will lead to decreased vision, accompanied by indirect or persistent eye pain, and in severe cases, complete loss of vision. Ophthalmology also uses tonometers when examining some special eye diseases. It is an indispensable device in intraocular pressure monitoring throughout the screening, diagnosis and treatment of glaucoma.

[0003] As an ophthalmic testing device, tonometer is divided into contact tonometer and non-contact tonometer. With the maturity of technology, non-contact tonometer is gradually replacing contact tonometer because it can avoid cross infection caused by direct contact with the cornea of ​​the subject and does not require surface anesthesia, which is safer. When in use, it uses a controllable pulse airflow to flatten the constant area of ​​about 3.6mm in the center of the cornea, and uses a microcomputer to sense the light reflected from the corneal surface and the time required to flatten this layer of area to measure the intraocular pressure value.

[0004] During the use of non-contact tonometer, data errors may occur due to equipment aging or sensor failure. If the air path is blocked or offset, the test will be directly affected. Therefore, the tonometer needs to be calibrated regularly to ensure the accuracy of the test results. For the calibration of the tonometer, a simulated eye is generally used for calibration. The existing simulated eye is generally fixed in the simulated eye shell. When calibrating, it needs to be fixed at the chin seat position of the tonometer. The chin seat is generally designed to be arc-shaped, and it is difficult to ensure complete fit when fixed. Therefore, the simulated eye and the tonometer air outlet are not in good contact. There may be a certain deviation angle in the direction facing the mouth (that is, when observing from the side, it can be seen that there is an angle between the measuring head and the simulated eye), and the tonometer outlet nozzle can only move horizontally and vertically. Therefore, based on the detection principle of the non-contact tonometer, the outlet nozzle will press the tilted simulated eye at too large an angle, thereby affecting the final detection result and causing a deviation in the calibration result. When the tonometer is used, the operator generally manually judges whether the detection surface is facing, so there is a certain deviation in the adjustment of the simulated eye angle. For this reason, a simulated eye and a device for calibrating the tonometer are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a simulated eye and a device thereof for calibrating a tonometer, which solves the problem that it is difficult to accurately adjust the simulated eye to face the air outlet of the tonometer when there is an oblique angle between the simulated eye and the air outlet of the tonometer, thereby inevitably causing deviation in the calibration result. By utilizing the gravity of the simulated eye itself, the simulated eye is always facing the air outlet of the tonometer regardless of how the fixing device changes, thereby ensuring that the air outlet of the tonometer can quickly and accurately perform air pressure detection on the detection surface of the simulated eye.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A simulated eye for calibrating an intraocular pressure meter comprises a simulated eye component, a connecting column and a pressure detection tube, wherein the simulated eye component comprises a cornea, a sclera, an iris, a vitreous body and aqueous humor having the same structure as a real eye, the pressure detection tube is located at the rear side of the simulated eye component, and a pressure gauge is connected to the rear side of the pressure detection tube, the connecting column is located at the top of the simulated eye component, a water inlet hole is provided at the top of the connecting column, the water inlet hole passes through the connecting column and the simulated eye component, and a closing plug is provided in the inner cavity of the water inlet hole, and the line of action of the gravity of the simulated eye component always passes through its center of gravity.

[0008] In the above scheme, water can be injected into the simulated eye through the water inlet hole and the pressure in the simulated eye component can be fed back through the pressure gauge. The simulated eye can be quickly injected or absorbed with water to adjust its pressure value according to the actual calibration needs. The pressure value can be adjusted at any time within 10-60mmHg. It can not only be used to calibrate the intraocular pressure in the normal range, but also can be used to calibrate the intraocular pressure in a simulated high intraocular pressure state.

[0009] A fixing device for a simulated eye for tonometer calibration, applicable to the simulated eye described in claim 1, comprising a fixed shell, a movable circular groove provided on the top of the fixed shell, and a ball located in the inner cavity of the movable circular groove, wherein the ball is connected to the connecting column, the water inlet hole passes through the ball, a fixing ring is sleeved on the outer wall of the connecting column, the center of the fixing ring always coincides with the center of the ball, and a lifting assembly and a limiting assembly are respectively provided on the top and bottom of the fixing ring;

[0010] The lifting component controls the fixed ring to rise until it contacts the bottom of the sphere, whereupon the fixed ring limits and fixes the sphere. When the fixed ring rises, the limiting component contracts to clamp and limit the simulation eye component.

[0011] In the above scheme, the simulated eye used in the calibration of the existing tonometer is generally fixed in the simulated eye shell, which is fixed as a whole with the chin seat of the tonometer. The chin seat of the tonometer is generally designed in an arc shape, and it is difficult to ensure complete fit when fixed. Therefore, there may be a certain deviation angle between the simulated eye and the tonometer air outlet nozzle in the facing direction, which makes it difficult for the air outlet nozzle to face the simulated eye component, thereby causing the compressed area of ​​the simulated eye component to become larger, thereby affecting the detection result of the tonometer. If it is adjusted manually, it is difficult to accurately control the change in angle. In view of the above problem, this scheme uses the simulated eye component as a gravity ball, and uses its own gravity after being filled with water to ensure that it is always in a vertical state, so that the tonometer air outlet nozzle can face the simulated eye. During calibration, there is no need to perform calibration adjustments multiple times, which is more convenient.

[0012] Preferably, the lifting assembly includes side connecting blocks symmetrically connected to the outer wall of the fixed ring, a screw rod penetrating the two side connecting blocks, a pulley fixedly connected to the top of the screw rod, and a transmission belt sleeved on the outer walls of the two pulleys. A rotating wheel is arranged on the top of the left pulley, and the top of the fixed ring is arc-shaped and covered with a rubber layer.

[0013] In the above scheme, the two pulleys connected by the transmission belt are driven to rotate synchronously by rotating the rotating wheel, thereby making the two screws rotate synchronously, thereby driving the fixed ring to be steadily lifted until it is against the bottom of the sphere to limit and fix it. The two symmetrically arranged screws can ensure the stability of the limiting force, thereby ensuring the stability of the limiting fixation.

[0014] Preferably, the limiting assembly includes an open fixing ring, an extrusion strip symmetrically arranged on the top of the open fixing ring, an extrusion ring sleeved on the outer walls of the two extrusion strips, a single-headed ball hinge rod evenly distributed on the inner ring of the open fixing ring, and a silicone strip connected to the single-headed ball hinge rod, the two extrusion strips are arranged obliquely on the back sides of the extrusion strips and the inner ring of the extrusion ring, a front-to-back symmetrical double-headed ball hinge rod is arranged on the top of the extrusion ring, the top ends of the two double-headed ball hinge rods are connected to the bottom of the open fixing ring, and the bottom of the inner ring of the open fixing ring is connected to the bottom of the simulated eye assembly.

[0015] In the above scheme, the extrusion ring is moved upward by moving the fixing ring upward, thereby squeezing the two extrusion strips, so that the open fixing ring is retracted, thereby fixing the outer wall of the simulated eye assembly, ensuring its stability during use, and avoiding displacement due to blowing from the tonometer outlet nozzle, thereby affecting the calibration result.

[0016] Preferably, a left-right symmetrical and penetrating mounting hole is provided on the front side of the silicone strip, a detection rod is provided in the inner cavity of the mounting hole, the mounting hole is dumbbell-shaped, the detection rod is conical, the larger diameter end of the detection rod is located on the front side of the mounting hole, and the larger diameter end of the detection rod is larger than the minimum diameter of the mounting hole, and the fixed shell is provided with left-right symmetrical arc-shaped observation windows at the position corresponding to the silicone strip, and the width of the two arc-shaped observation windows is 1.5-2 times the width of the silicone strip.

[0017] In the above scheme, when the wind direction of the air blowing nozzle is offset, the detection rod at the corresponding position will be blown to move backward. When the detection rod moves backward and passes through the thinnest diameter of the mounting hole, it will be squeezed, thereby causing the silicone strip to exert a stronger squeezing force on the simulation eye assembly to prevent it from being offset due to the offset wind force, thereby affecting subsequent calibration tests. The arc-shaped observation window is used to observe whether the detection rod moves. If it does not move, the air blowing nozzle has not shifted. If it moves, the corresponding offset angle of the air outlet nozzle is obtained according to the position of the moved detection rod, and corresponding maintenance is performed accordingly. A sufficiently wide arc-shaped observation window is left to facilitate the resetting of the detection rod for subsequent use.

[0018] Preferably, a uniformly distributed return spring is arranged on the top of the extrusion ring, the top of the return spring is connected to the bottom of the fixed ring, and the return spring, the extrusion ring and the fixed ring are all movably connected.

[0019] In the above solution, the reset spring is used to reset the extrusion ring to prevent it from getting stuck, and the movable connection can avoid interference with the extrusion ring when it deviates.

[0020] Preferably, a fixed base is provided at the bottom of the fixed shell, and an arc-shaped seat is provided at the bottom of the fixed base, and the arc-shaped seat has the same curvature as the chin seat of the tonometer.

[0021] In the above scheme, the arc seat and the bottom curvature of the chin seat are set to be the same. When fixing, the contact area between the arc seat and the chin seat can be increased, thereby increasing the stability of the fixation. If the arc seat is set as a plane, there are only a few points of contact on the contact surface, and there is a hidden danger of insufficient stability during detection.

[0022] Preferably, a rotating shaft is provided on the left and right sides of the fixed base, and connecting rods are connected to the opposite sides of the two rotating shafts. The bottoms of the two connecting rods are connected to evenly distributed fixing claws, and the fixing claws are foldable hoses with anti-slip sponges covered on the surface.

[0023] In the above scheme, the rotatable and retractable connecting rod and the fixing claw can reduce the overall volume of the simulated eye when it is not in use, making it easier to store. The fixing claw is a foldable hose, which can be easily wrapped and fixed to the side rods of the chin seat of different shapes, thereby adapting to the calibration of tonometers of different brands.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention utilizes the gravity of the simulated eye itself so that no matter how the fixing device changes, it is always directly opposite to the air outlet of the tonometer, thereby ensuring that the air outlet of the tonometer can quickly and accurately perform air pressure detection on the detection surface of the simulated eye. There is no need to adjust the angle of the simulated eye multiple times, which not only reduces the adjustment time but also avoids the error of the detection result caused by angle deviation, thereby ensuring the accuracy of the final calibration result.

[0026] 2. The present invention ensures that the simulated eye can always maintain stability in a forward state by fixing the top and limiting the outer ring of the simulated eye, thereby preventing the simulated eye from shaking due to the airflow from the tonometer outlet nozzle due to insufficient stability, thereby affecting subsequent calibration test results and thus affecting the judgment of the calibration data of the tonometer.

[0027] 3. The present invention can detect and feedback the air flow of the tonometer outlet nozzle through multiple sets of detection rods while limiting the outer circle of the simulated eye. While the detection rods are performing detection and feedback, the silicone strip can be squeezed to increase the fixing strength of the simulated eye to avoid displacement due to the offset wind force, thereby affecting subsequent calibration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the structure of the simulated eye assembly and its device of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the lifting assembly of the present invention;

[0031] Figure 3 It is a schematic cross-sectional structural diagram of a lifting assembly of the present invention;

[0032] Figure 4 It is a schematic diagram of the fixed housing structure of the present invention;

[0033] Figure 5 It is a schematic diagram of the structure of the silica gel strip and the detection rod of the present invention;

[0034] Figure 6 It is a schematic diagram of the fixed base structure of the present invention;

[0035] Figure 7 This is a schematic diagram of the structure of the fixed base of the present invention in use state;

[0036] Figure 8 It is a schematic diagram of the structure of the pressure detection tube and the pressure gauge of the present invention;

[0037] Fig. 9 It is a schematic diagram of the structure of the simulated eye component of the present invention.

[0038] In the figure: 100, fixed base; 101, rotating shaft; 102, connecting rod; 103, fixed claw; 104, arc seat; 105, fixed shell; 106, arc observation window; 107, ball; 108, fixed ring; 109, side connecting block; 110, screw; 111, pulley; 112, transmission belt; 113, rotating wheel; 114, closing plug; 115, extrusion ring; 116, reset spring; 117, double-headed ball hinge rod; 118, open fixing ring; 119, single-headed ball hinge rod; 120, silicone strip; 121, water inlet hole; 122, mounting hole; 123, detection rod; 124, movable circular groove; 125, connecting column; 126, extrusion strip; 200, simulation eye assembly; 201, pressure detection tube; 202, pressure gauge. DETAILED DESCRIPTION

[0039] The following is a more clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention, and the described embodiments are only a part of all the embodiments of the present invention. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0040] See also Figures 1 to 9 The present invention provides a simulated eye and a device for tonometer calibration, and the technical solution is as follows:

[0041] Reference Figure 1 , 39. A simulated eye for calibrating an intraocular pressure meter, comprising a simulated eye assembly 200, a connecting column 125 and a pressure detection tube 201, wherein the simulated eye assembly 200 comprises a cornea, a sclera, an iris, a vitreous body and aqueous humor which are consistent with the structure of a real eye, (herein: the cornea is made of transparent silicone, and its diameter, curvature, thickness, elasticity and aspheric design are the same as those of a real eye; the sclera is made of white silicone, and its size, shape, diameter, transverse diameter, thickness and elasticity are the same as those of a real eye; the iris is made of black silicone to separate the front and back chambers, and the pupil size and thickness are the same as those of a real eye; the aqueous humor and vitreous body are made of Filled with physiological saline) Setting the simulated eye assembly 200 to be consistent with the structure of a real eye can make the test result closer to the actual result, so that a more accurate result can be obtained during calibration. The pressure detection tube 201 is connected to the rear side of the simulated eye assembly 200, and the rear side of the pressure detection tube 201 is connected to a pressure gauge 202. The pressure gauge 202 can detect and feedback the pressure inside the simulated eye assembly 200 through the pressure detection tube 201, so that the operator can quickly obtain the pressure value during use and control the pressure value as needed. The connecting column 125 is fixedly connected to the top of the simulated eye component 200. A water inlet hole 121 is opened on the top of the connecting column 125. The water inlet hole 121 penetrates the connecting column 125 and the simulated eye component 200, and a closing plug 114 is provided in the inner cavity of the water inlet hole 121. Water can be injected or absorbed into the simulated eye component 200 through the water inlet hole 121, thereby changing the pressure inside the simulated eye component 200. The pressure value can be adjusted at any time within 10-60 mmHg, which is not only used for calibrating the normal range of intraocular pressure, but also for calibrating the intraocular pressure in a simulated high intraocular pressure state. Injecting water at the top can also prevent water from overflowing due to the water pressure after the simulated eye component 200 is filled with water, thereby causing the pressure value inside the simulated eye component 200 to change, affecting the subsequent calibration value. The line of action of the gravity of the simulated eye component 200 always passes through its center of gravity; thereby ensuring that the simulated eye component 200 can always change its position with the action of gravity, avoiding the situation where the center of gravity and gravity are not on the same line of action, causing the movement of the simulated eye component 200 to be affected by the force of the center of gravity, making it difficult to ensure that its front is always perpendicular to gravity.

[0042] Reference Figure 2 , 34. A fixing device for calibrating a simulated eye for a tonometer, which is suitable for installing the above-mentioned simulated eye, comprising a fixed shell 105, a movable circular groove 124 opened on the top of the fixed shell 105, and a ball 107 located in the inner cavity of the movable circular groove 124. The ball 107 is connected to a connecting column 125, and a water inlet 121 passes through the ball 107. The outer wall of the connecting column 125 is sleeved with a fixed ring 108, and the center of the fixed ring 108 always coincides with the center of the ball 107, thereby ensuring that when the fixed ring 108 fixes the ball 107, the ball 107 will not change its position due to the fixing force, so that the state of the simulated eye component 200 remains unchanged, and a lifting component and a limiting component are respectively provided on the top and bottom of the fixed ring 108;

[0043] The lifting component controls the fixed ring 108 to rise until it contacts the bottom of the sphere 107, and the fixed ring 108 limits and fixes the sphere 107. While the fixed ring 108 rises, the limiting component contracts to clamp and limit the simulated eye component 200. By fixing the top and the outer ring of the simulated eye component 200, the simulated eye component 200 can be made more stable, avoiding slight deviation under the influence of the tonometer's air nozzle, which would cause a final deviation in the calibration result.

[0044] As an embodiment of the present invention, refer to Figure 2 , 3 The lifting assembly includes a side connection block 109 symmetrically connected to the outer wall of the fixed ring 108, a screw 110 penetrating the two side connection blocks 109, the screw 110 and the side connection block 109 are in a threaded connection relationship, a pulley 111 fixedly connected to the top of the screw 110, and a transmission belt 112 sleeved on the outer walls of the two pulleys 111. A rotating wheel 113 is arranged on the top of the left pulley 111. The top of the fixed ring 108 is an arc-shaped setting and the top is covered with a rubber layer; by rotating the rotating wheel 113, the left pulley 111 connected thereto can be driven to rotate, and due to the action of the transmission belt 112, the two pulleys 111 rotate synchronously, so that the screw 110 connected to the two pulleys 111 rotates synchronously therewith, and while the screw 110 rotates, the side connecting block 109 threadedly connected thereto will be driven to rise, so that the fixing ring 108 rises accordingly, until the fixing ring 108 abuts against the bottom of the ball 107 to limit and fix the ball 107. The synchronous rise of both sides ensures the stability of the rising of the fixing ring 108 and also ensures the stability of the fixation of the ball 107. The rubber layer is used to increase the friction between the contact surface of the fixing ring 108 and the ball 107, thereby increasing the stability of the fixation.

[0045] As an embodiment of the present invention, refer to Figure 2 , 3The limiting assembly includes an open fixing ring 118, an extrusion strip 126 fixedly connected to the top of the open fixing ring 118 and symmetrically arranged, an extrusion ring 115 sleeved on the outer wall of the two extrusion strips 126, the extrusion ring 115 is a flexible material that can undergo a certain deformation, a single-headed ball hinge rod 119 evenly distributed on the inner ring of the open fixing ring 118, and a silicone strip 120 connected to the single-headed ball hinge rod 119, the two extrusion strips 126 are arranged on the opposite sides and the inner ring of the extrusion ring 115 are obliquely arranged, and a front-to-back symmetrical double-headed ball hinge rod 117 is arranged on the top of the extrusion ring 115, the tops of the two double-headed ball hinge rods 117 are connected to the bottom of the open fixing ring 118, and the bottom of the inner ring of the open fixing ring 118 is connected to the simulated eye assembly 200 The bottom is connected; when the fixed ring 108 rises, due to the action of the double-headed ball hinge rod 117, the extrusion ring 115 will be pulled up, and as it rises, it will squeeze the two extrusion strips 126 arranged obliquely on the opposite sides, thereby tightening the open fixed ring 118 (there is a fixed fulcrum between its bottom and the simulated eye assembly 200), and the tightened open fixed ring 118 will drive the single-headed ball hinge rod 119 and the silicone strip 120 to move accordingly until they are fitted to the outer wall of the simulated eye assembly 200. The single-headed ball hinge setting of the silicone strip 120 can ensure that it can be slightly offset according to the outer wall of the simulated eye assembly 200 during use, thereby adapting to simulated eye assemblies 200 of different diameters under different pressures.

[0046] As an embodiment of the present invention, refer to Figure 5 The front side of the silicone strip 120 is provided with a left-right symmetrical and penetrating mounting hole 122, and the inner cavity of the mounting hole 122 is provided with a detection rod 123. The mounting hole 122 is a dumbbell-shaped setting, and the detection rod 123 is a conical setting. The larger diameter end of the detection rod 123 is located in the front side of the mounting hole 122, and the larger diameter end of the detection rod 123 is larger than the minimum diameter of the mounting hole 122. When the wind direction of the blowing nozzle deviates, the detection rod 123 at the corresponding position will be blown to move backward. When the detection rod 123 moves backward and passes through the thinnest diameter of the mounting hole 122, it will be squeezed, thereby making the silicone strip 120 exert a stronger squeezing force on the simulated eye component 200 to avoid In order to prevent it from being offset due to the offset wind force, thereby affecting the subsequent calibration test, the fixed shell 105 is provided with left-right symmetrical arc observation windows 106 at the position corresponding to the silicone strip 120, and the width of the two arc observation windows 106 is 1.5-2 times the width of the silicone strip 120; the arc observation window 106 is used to observe whether the detection rod 123 moves. If it does not move, the blowing nozzle does not shift. If it moves, the offset angle corresponding to the air outlet nozzle is obtained according to the position of the moved detection rod 123, and corresponding maintenance is performed accordingly. The arc observation window 106 with sufficient width is used to facilitate the resetting of the detection rod 123 for subsequent use.

[0047] As an embodiment of the present invention, refer to Figure 2 ,3 A uniformly distributed return spring 116 is arranged on the top of the extrusion ring 115, and the top of the return spring 116 is connected to the bottom of the fixed ring 108. The return spring 116, the extrusion ring 115 and the fixed ring 108 are all movably connected. After the simulated eye assembly 200 is used, it needs to be restored. The return spring 116 can synchronously with the double-headed ball hinge rod 117 to apply downward pressure to the extrusion ring 115 to reset it and avoid it from getting stuck and affecting subsequent use.

[0048] As an embodiment of the present invention, refer to Figure 6 , 7 8. A fixed base 100 is provided at the bottom of the fixed shell 105, and an arc seat 104 is provided at the bottom of the fixed base 100. The arc seat 104 has the same arc as the chin seat of the tonometer. This setting increases the contact area between the arc seat 104 and the chin seat, thereby increasing the stability of the fixation. The arc seat 104 here is a solid setting, and a non-slip silicone pad is provided at the bottom, thereby increasing the stability of the fixation; rotating shafts 101 are provided on the left and right sides of the fixed base 100, and connecting rods 102 are connected to the opposite sides of the two rotating shafts 101. The bottoms of the two connecting rods 102 are connected with evenly distributed fixing claws 103, and the fixing claws 103 are foldable hoses, and the surface is covered with non-slip sponges; the foldable connecting rods 102 and the fixing claws 103 reduce the overall volume of the device when it is not in use, which is more convenient for storage, and the fixing claws 103 are foldable hoses, which can be convenient for winding and fixing the side rods of the chin seat of different shapes, so as to adapt to the calibration of tonometers of different brands.

[0049] Working principle: This solution simulates the actual installation and use of the simulated eye and finds that based on the existing alignment method of the tonometer nozzle, it can only be translated horizontally or vertically. After the simulated eye is fixed, based on the arc-shaped setting of the chin seat of the tonometer, the simulated eye will be offset. The offset simulated eye causes the contact area between the airflow blown out of the nozzle and the simulated eye to change (the measurement head is tilted at a certain angle relative to the cornea. This angle deviation will lead to inaccurate intraocular pressure measurement values. If the airflow blown out by the measuring head is tilted and presses the cornea If the angle is too large, the measured intraocular pressure value will be higher than the actual value; if the angle is too small, the measured value may be lower than the actual value. In some high-precision intraocular pressure calibration experiments, it is found that a tilt angle of only 10 degrees may cause an intraocular pressure measurement error of about 3-5 mmHg). To address this problem, the simulated eye device is designed. When in use, the air outlet of the tonometer can always be directly opposite to the simulated eye, thereby ensuring the accuracy of the calibration data. The simulated eye is designed to be suspended in the air so that it can quickly feedback the airflow emitted by the air outlet to complete the calibration. The specific method is as follows:

[0050] Simulated eye pressure control: water can be injected into the simulated eye assembly 200 through the water inlet hole 121, and the pressure inside the simulated eye assembly 200 after water injection is indicated by the pressure gauge 202. When the pressure reaches the required value, the water injection is stopped and the eye is sealed by the sealing plug 114. At this time, a calibrated simulated eye with a known pressure is obtained;

[0051] Fixation of simulated eye: When water is injected into the simulated eye assembly 200, due to the effect of gravity, no matter what angle deviation exists in the external fixing device of the simulated eye assembly 200, the simulated eye assembly 200 always maintains a state where gravity is vertically downward, that is, its detection surface is always parallel to the plane where the tonometer outlet nozzle is located. At this time, rotating the rotating wheel 113 can drive the left pulley 111 connected to it to rotate, and due to the effect of the transmission belt 112, the two pulleys 111 rotate synchronously, so that the screw 110 connected to the two pulleys 111 rotates synchronously, and while the screw 110 rotates, the side connecting block threadedly connected to it 109 will be driven to rise, so that the fixed ring 108 will rise accordingly, until the fixed ring 108 contacts the bottom of the ball 107 to limit and fix the ball 107. When the fixed ring 108 moves upward, the extrusion ring 115 can be pulled up by the double-headed ball hinge rod 117. As it rises, it will squeeze the two extrusion strips 126 arranged obliquely on the opposite sides, thereby tightening the open fixed ring 118. The tightened open fixed ring 118 will drive the single-headed ball hinge rod 119 and the silicone strip 120 to move accordingly, until they are attached to the outer wall of the simulated eye component 200, thereby realizing double fixation of the simulated eye component 200.

[0052] Calibration feedback: The air outlet of the tonometer ejects air flow. If the air flow is normal, the detection rod 123 will not be offset, and the area of ​​the simulated eye component 200 facing the air outlet will be deformed. The tonometer uses a microcomputer to sense the light reflected from the surface of the simulated eye detection area and the time required to flatten this layer of area to measure the intraocular pressure value (repeated tests are performed multiple times, and the average value is taken as calibration data); if the air flow is offset, the offset air flow will blow the detection rod 123 at the corresponding offset position to move it backward. When the detection rod 123 moves backward and passes through the thinnest diameter of the mounting hole 122, it will be squeezed, thereby causing the silicone strip 120 to apply a stronger squeezing force to the simulated eye component 200 to prevent it from being offset due to the offset wind force. After a set of tests is completed, the movement of the detection rod 123 is observed through the arc-shaped observation window 106 to feedback the air flow situation: if it has not moved, the air outlet has not shifted; if it has moved, the offset angle corresponding to the air outlet is obtained according to the position of the moved detection rod 123, thereby performing rapid maintenance of the corresponding position.

[0053] The main advantages and working principles of the embodiments of the present invention have been explained above. Then, as a person skilled in the art, it should be understood that the above embodiments are not intended to be limiting conditions of the present invention. Various changes, modifications, substitutions and variations may be made without departing from the principles, spirit and scope of the invention. These changes, modifications, substitutions and variations should all fall within the scope of protection of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A simulated eye for calibrating an intraocular pressure meter, comprising a simulated eye assembly (200), characterized in that: The invention also comprises a connecting column (125) and a pressure detection tube (201); the simulated eye component (200) comprises a cornea, a sclera, an iris, a vitreous body and aqueous humor which are consistent with the structure of a real eye; the pressure detection tube (201) is located at the rear side of the simulated eye component (200); and the rear side of the pressure detection tube (201) is connected to a pressure gauge (202); the connecting column (125) is located at the top of the simulated eye component (200); a water inlet hole (121) is provided at the top of the connecting column (125); the water inlet hole (121) passes through the connecting column (125) and the simulated eye component (200); and a sealing plug (114) is provided in the inner cavity of the water inlet hole (121); and the line of action of gravity of the simulated eye component (200) always passes through its center of gravity.

2. A fixing device for a simulated eye for tonometer calibration, suitable for the simulated eye described in claim 1, characterized in that: The invention comprises a fixed shell (105), a movable circular groove (124) provided on the top of the fixed shell (105), and a sphere (107) located in the inner cavity of the movable circular groove (124); the sphere (107) and the connecting column (125) are connected; the water inlet hole (121) passes through the sphere (107); a fixed ring (108) is sleeved on the outer wall of the connecting column (125); the center of the fixed ring (108) always coincides with the center of the sphere (107); and a lifting component and a limiting component are respectively provided on the top and bottom of the fixed ring (108); The lifting component controls the fixed ring (108) to rise until it contacts the bottom of the ball (107), whereupon the fixed ring (108) limits and fixes the ball (107); while the fixed ring (108) rises, the limiting component contracts to clamp and limit the simulated eye component (200).

3. The fixing device for a simulated eye for tonometer calibration according to claim 2, characterized in that: The lifting assembly comprises a side connection block (109) symmetrically connected to the outer wall of a fixed ring (108), a screw rod (110) penetrating the two side connection blocks (109), a pulley (111) fixedly connected to the top of the screw rod (110), and a transmission belt (112) sleeved on the outer walls of the two pulleys (111); a rotating wheel (113) is arranged on the top of the left pulley (111); and the top of the fixed ring (108) is arranged in an arc shape and is covered with a rubber layer.

4. The fixing device for a simulated eye for tonometer calibration according to claim 2, characterized in that: The limiting assembly comprises an open fixing ring (118), an extrusion strip (126) connected to the top of the open fixing ring (118) and arranged symmetrically on the left and right, an extrusion ring (115) sleeved on the outer walls of the two extrusion strips (126), a single-headed ball hinge rod (119) evenly distributed on the inner ring of the open fixing ring (118), and a silicone strip (120) connected to the single-headed ball hinge rod (119), the two extrusion strips (126) are arranged on opposite sides and the inner ring of the extrusion ring (115) are arranged obliquely, a double-headed ball hinge rod (117) symmetrically arranged on the top of the extrusion ring (115), the top ends of the two double-headed ball hinge rods (117) are connected to the bottom of the open fixing ring (118), and the bottom of the inner ring of the open fixing ring (118) is connected to the bottom of the simulated eye assembly (200).

5. The fixing device for a simulated eye for tonometer calibration according to claim 4, characterized in that: The front side of the silicone strip (120) is provided with a left-right symmetrical and penetrating mounting hole (122), the inner cavity of the mounting hole (122) is provided with a detection rod (123), the mounting hole (122) is dumbbell-shaped, the detection rod (123) is conical, the end with a larger diameter of the detection rod (123) is located in the front side of the mounting hole (122), and the diameter of the end with a larger diameter of the detection rod (123) is larger than the minimum diameter of the mounting hole (122), and the fixed housing (105) is provided with left-right symmetrical arc-shaped observation windows (106) at positions corresponding to the silicone strip (120), and the width of the two arc-shaped observation windows (106) is 1.5-2 times the width of the silicone strip (120).

6. The fixing device for a simulated eye for tonometer calibration according to claim 4, characterized in that: The top of the extrusion ring (115) is provided with uniformly distributed return springs (116), the top of the return spring (116) is connected to the bottom of the fixed ring (108), and the return spring (116), the extrusion ring (115) and the fixed ring (108) are all movably connected.

7. The fixing device for a simulated eye for tonometer calibration according to claim 2, characterized in that: A fixed base (100) is arranged at the bottom of the fixed housing (105), and an arc-shaped seat (104) is arranged at the bottom of the fixed base (100). The arc-shaped seat (104) has the same arc as the chin seat of the tonometer.

8. The fixing device for a simulated eye for tonometer calibration according to claim 7, characterized in that: The fixed base (100) is provided with a rotating shaft (101) on both the left and right sides, the two rotating shafts (101) are connected with connecting rods (102) on opposite sides, the bottoms of the two connecting rods (102) are connected with evenly distributed fixing claws (103), and the fixing claws (103) are foldable hoses with anti-skid sponges on the surface.

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