An intraocular pressure measuring device
By combining a telescope-type structure with a spring-loaded pressure measurement module, and using a shape memory alloy wire motor to adjust the probe position, the problems of complex operation and large measurement error of traditional tonometers are solved, and simple and accurate intraocular pressure measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SCI-TECH UNIV
- Filing Date
- 2025-06-16
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional handheld tonometers are complicated to operate, and users have difficulty aligning the measurement point accurately, resulting in large measurement errors. They are especially unsuitable for the elderly or patients with limited hand mobility.
It adopts a telescope-style structure, combined with a spring-loaded pressure measurement module and a position adjustment module. It uses a shape memory alloy wire motor to adjust the position of the probe, and guides the user's line of sight through a CCD camera and an optical fixation module to ensure that the probe accurately hits the center of the cornea.
The operation process has been simplified, and the accuracy and convenience of measurement have been improved. It is especially suitable for the elderly and patients with limited hand movements, and the difficulty of operation for users has been reduced.
Smart Images
Figure CN224387451U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical and health care, specifically an intraocular pressure measurement device. Background Technology
[0002] Glaucoma is a serious eye disease that damages the optic nerve. Although there is currently no cure, early detection and effective management can slow its progression. Alarmingly, less than half of glaucoma patients know they have the disease. This is mainly because glaucoma often has no obvious symptoms in its early stages. Many people only realize they have glaucoma before experiencing significant vision loss, or even when they are on the verge of blindness.
[0003] Untreated glaucoma causes irreversible damage to the optic nerve, leading to a gradual narrowing of the visual field and potentially complete blindness. The vision impairment is gradual, usually beginning with peripheral vision, and patients often only notice the problem when central vision is affected. Because glaucoma symptoms are often subtle, many patients miss the opportunity for early diagnosis and treatment. Furthermore, glaucoma is hereditary, meaning that if one family member has glaucoma, other family members may also have a higher risk. This makes family history an important factor in glaucoma screening.
[0004] Lowering intraocular pressure (IOP) is currently the only effective treatment for glaucoma. Whether through medication, laser therapy, or surgery, the goal is to slow the damage to the optic nerve caused by elevated IOP. However, IOP is not a fixed value; it fluctuates with time, activity, diet, and other factors. The diurnal variation in IOP can be significant, meaning a single measurement cannot fully reflect a patient's IOP status.
[0005] Therefore, regular intraocular pressure monitoring is crucial for glaucoma patients. This not only helps doctors assess the effectiveness of treatment but also allows both patients and doctors to adjust treatment plans in a timely manner to achieve the best results. The advent of portable devices such as handheld tonometers allows patients to conveniently monitor their intraocular pressure at home, providing more frequent and comprehensive data for better disease management.
[0006] In daily life, self-monitoring of intraocular pressure is crucial for many patients with eye diseases, especially glaucoma. However, while traditional handheld tonometers offer advantages in portability and ease of operation, they face several challenges in practical use. First, these devices often require users to possess certain operating skills to ensure measurement accuracy. Second, due to the complex structure of the eye, it is difficult for users to accurately align the tonometer's measuring point during self-measurement, which not only increases the difficulty of operation but may also lead to measurement errors. Furthermore, the operation of handheld tonometers is often complex, requiring users to maintain a stable posture during measurement, which is undoubtedly a significant challenge for the elderly or patients with limited hand dexterity. Utility Model Content
[0007] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide an intraocular pressure measuring device and method to reduce the user's operating difficulty and improve the measurement accuracy.
[0008] The technical solution of this utility model is:
[0009] An intraocular pressure measuring device, characterized in that: it includes a telescope tube with an eye shield, a spring-loaded pressure measuring module disposed in the telescope tube, a position adjustment module connecting the telescope tube and the spring-loaded pressure measuring module, and a controller electrically connecting the position adjustment module and the spring-loaded pressure measuring module.
[0010] The rebound pressure measurement module includes a guide, a probe that can be axially slidably positioned on the guide, and a recovery coil and a transmission coil respectively disposed at the front and rear ends of the guide.
[0011] The inner support also includes an optical fixation module; the optical fixation module includes a CCD camera located behind the guide, a beam splitter located between the guide and the CCD camera, a convex lens located in the middle of the guide, and an indicator light located below the beam splitter; the guide, CCD camera, beam splitter, and convex lens are arranged coaxially.
[0012] The position adjustment module includes an outer bracket fixed to the inner wall of the telescope tube, an inner bracket set in the outer bracket, and eight shape memory alloy wire motors that connect the outer bracket and the inner bracket in a diagonal cross manner.
[0013] The shape memory alloy wire motor is connected to the upper left and right sides of the front, the lower left and right sides of the front, the upper left and right sides of the rear, and the lower left and right sides of the rear of the outer bracket and the inner bracket respectively; the spring-loaded pressure measuring module is fixed in the inner bracket.
[0014] The position adjustment module includes an inner support that can be axially slidably positioned in the telescope tube and four shape memory alloy wire motors arranged parallel to the sliding direction of the inner support and connecting the telescope tube and the inner support.
[0015] The position adjustment module includes an inner support that can be axially slidably positioned in the telescope tube, a seal disposed between the telescope tube and the inner support, a position adjustment cavity formed by the seal, the inner wall of the telescope tube and the outer wall of the inner support, and an air pump communicating with the position adjustment cavity.
[0016] The beneficial effects of this utility model are:
[0017] 1. This utility model adopts a telescope-style structure, which can guide the user to look forward when measuring intraocular pressure. It is simple and convenient to operate, avoiding the problem that users are afraid to open their eyes when using traditional tonometers.
[0018] 2. This utility model uses a spring-loaded pressure measurement module for intraocular pressure measurement. The probe is launched forward under the action of magnetic force and strikes the center of the cornea of the eyeball. By measuring the motion parameters of the probe, the intraocular pressure data can be accurately obtained, which greatly improves the measurement accuracy.
[0019] 3. This utility model uses a position adjustment module to adjust the position of the spring-loaded pressure measurement module. The position adjustment module includes several memory alloy wire motors. The extension and retraction of the memory alloy wire motors can ensure that the probe accurately hits the center of the cornea of the eyeball. This not only reduces the difficulty of operation for users, but also improves the measurement accuracy, effectively solving the problem of users measuring intraocular pressure themselves. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this utility model.
[0021] Figure 2 This is a schematic diagram of the main structure of Embodiment 1 of this utility model.
[0022] Figure 3 This is one of the cross-sectional structural schematic diagrams of Embodiment 1 of this utility model.
[0023] Figure 4 This is the second cross-sectional structural schematic diagram of Embodiment 1 of this utility model.
[0024] Figure 5 This is a schematic diagram of the left side of Embodiment 1 of this utility model.
[0025] Figure 6 This is a three-dimensional structural diagram of the position adjustment module of Embodiment 1 of this utility model.
[0026] Figure 7This is a cross-sectional structural diagram of the inner support and the spring-loaded pressure measuring module of Embodiment 1 of this utility model.
[0027] Figure 8 This is a three-dimensional structural diagram of the spring-loaded pressure testing module of Embodiment 1 of this utility model.
[0028] Figure 9 This is one of the schematic diagrams of the intraocular pressure measurement method of this utility model.
[0029] Figure 10 This is the second schematic diagram of the intraocular pressure measurement method of this utility model.
[0030] Figure 11 This is the third schematic diagram of the intraocular pressure measurement method of this utility model.
[0031] Figure 12 This is the fourth schematic diagram of the intraocular pressure measurement method of this utility model.
[0032] Figure 13 This is the fifth schematic diagram of the intraocular pressure measurement method of this utility model.
[0033] Figure 14 This is a schematic diagram of the position adjustment module in Embodiment 2 of this utility model.
[0034] Figure 15 This is a schematic diagram of the position adjustment module in Embodiment 3 of this utility model.
[0035] Figure label:
[0036] Telescope body 1, eyecup 1-1, guide 3-1, probe 3-2, transmitting coil 3-3, retrieval coil 3-4, camera 3-5, beam splitter 3-6, convex lens 3-7, indicator light 3-8, shape memory alloy wire motor 4, first shape memory alloy wire motor 4-1, second shape memory alloy wire motor 4-2, third shape memory alloy wire motor 4-3, fourth shape memory alloy wire motor 4-4, fifth shape memory alloy wire motor 4-5, sixth shape memory alloy wire motor 4-6, seventh shape memory alloy wire motor 4-7, eighth shape memory alloy wire motor 4-8, outer support 4-9, inner support 4-10, connector 4-11, slide 4-12, sealing component 4-13, position adjustment cavity 4-14, eyeball 9. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.
[0038] Example 1
[0039] like Figure 1 As shown, an intraocular pressure measuring device includes a telescope body 1, a position adjustment module, a spring-loaded pressure measuring module, an optical fixation module, and a controller.
[0040] The telescope tube is cylindrical with textured surfaces on the outer wall to fit comfortably against the fingers, facilitating handheld operation. An eyecup 1-1 is located at the front of the telescope tube. Made of flexible material, the eyecup fits snugly and covers the skin around the user's eyes, limiting the area where the user's eyes are positioned during measurement and ensuring the spring-loaded pressure measurement module is aligned correctly with the eyeball, thus improving measurement accuracy.
[0041] The spring-loaded pressure measurement module is installed inside the telescope tube, and the telescope tube and the spring-loaded pressure measurement module are connected by a position adjustment module.
[0042] The rebound pressure measurement module uses a rebound method to test intraocular pressure: first, a probe is sent towards the eyeball; after impacting the eyeball, the probe rebounds; and then the motion parameters of the probe are measured to calculate the intraocular pressure. The position adjustment module is used to adjust the position of the rebound pressure measurement module to improve measurement accuracy. The controller (omitted in the figure) is electrically connected to the position adjustment module and the rebound pressure measurement module.
[0043] The position adjustment module includes eight shape memory alloy wire motors connecting the telescope body and the spring-loaded pressure measurement module. For example... Figure 6 As shown, the position adjustment module includes: a first shape memory alloy wire motor 4-1, a second shape memory alloy wire motor 4-2, a third shape memory alloy wire motor 4-3, a fourth shape memory alloy wire motor 4-4, a fifth shape memory alloy wire motor 4-5, a sixth shape memory alloy wire motor 4-6, a seventh shape memory alloy wire motor 4-7, an eighth shape memory alloy wire motor 4-8, an outer support 4-9, and an inner support 4-10.
[0044] The outer and inner supports are rectangular frame structures. The outer support is fixed to the inner wall of the telescope tube, and the inner support is located inside the outer support. The spring-loaded pressure measuring module is fixed inside the inner support. The outer and inner supports are connected by eight shape memory alloy wire motors. Both the outer and inner supports are equipped with connectors 4-11 for fixing the ends of the shape memory alloy wire motors.
[0045] These eight shape memory alloy wire motors are connected to the outer and inner supports in a diagonally intersecting manner.
[0046] The first and second memory alloy wire motors are arranged in a cross pattern and connect the outer bracket and the upper left and right sides of the front part of the inner bracket. Figure 3 The first shape memory alloy wire motor connects the upper left of the front part of the outer bracket to the upper right of the front part of the inner bracket, and the second shape memory alloy wire motor connects the upper right of the front part of the outer bracket to the upper left of the front part of the inner bracket. Figure 3 The left side is the front part of the outer and inner supports. Figure 3 The right side is the rear of the outer and inner supports. Figure 5 The right side is the outer support and the left side of the inner support. Figure 5 The left side is the outer support and the right side is the inner support.
[0047] The third and fourth memory alloy wire motors are arranged in a cross pattern and connect the outer bracket and the lower left and right sides of the front part of the inner bracket. Figure 3 The third shape memory alloy wire motor connects the lower left of the front part of the outer bracket to the lower right of the front part of the inner bracket, and the fourth shape memory alloy wire motor connects the lower right of the front part of the outer bracket to the lower left of the front part of the inner bracket.
[0048] The fifth and sixth shape memory alloy wire motors are arranged crosswise and connect the upper left and right sides of the rear of the outer and inner brackets. Figure 3 The fifth shape memory alloy wire motor connects the upper left of the rear of the outer bracket to the upper right of the rear of the inner bracket, and the sixth shape memory alloy wire motor connects the upper right of the rear of the outer bracket to the upper left of the rear of the inner bracket.
[0049] The seventh and eighth shape memory alloy wire motors are arranged crosswise and connect the lower left and right sides of the rear of the outer and inner brackets. Figure 3 (Lower right), the seventh memory alloy wire motor connects the lower left of the rear of the outer bracket to the lower right of the rear of the inner bracket, and the eighth memory alloy wire motor connects the lower right of the rear of the outer bracket to the lower left of the rear of the inner bracket.
[0050] When the shape memory alloy wire motor is energized, it contracts. Energizing a portion of the shape memory alloy wire motor drives the spring-loaded pressure testing module to move in a designated direction, ensuring the probe accurately strikes the center of the eyeball during pressure testing. The direction of movement is... Figure 3 Horizontal direction and Figure 5 The horizontal and vertical directions.
[0051] When the spring-loaded pressure sensor module needs to move forward ( Figure 3 (On the left side), the first, second, third, and fourth shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current); when the spring-loaded pressure sensing module needs to move backward ( Figure 3 (on the right side), the fifth, sixth, seventh, and eighth shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current).
[0052] When the spring-loaded pressure sensor module needs to be moved to the left ( Figure 5On the right side), the first, third, fifth, and seventh shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current); when the spring-loaded pressure sensing module needs to move to the right ( Figure 5 (on the left side), the second, fourth, sixth, and eighth shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current).
[0053] When the spring-loaded pressure sensor module needs to move upward ( Figure 3 Above), the first, second, fifth, and sixth shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current); when the spring-loaded pressure sensor module needs to move downwards ( Figure 3 Below, the third, fourth, seventh, and eighth shape memory wire motors simultaneously increase their current (while the remaining shape memory wire motors decrease their current).
[0054] When the rebound pressure measurement module is powered on, it can generate a magnetic field to control the probe to launch and retrieve. Then, it can calculate the pressure characteristics inside the eyeball to provide data support for the subsequent determination of intraocular pressure values.
[0055] The rebound pressure measurement module includes a guide 3-1, a probe 3-2, a transmitting coil 3-3, and a retrieval coil 3-4. The probe is axially slidably positioned at the center of the guide. The front end of the probe is a small circular plastic ball. The retrieval coil and the transmitting coil are respectively coils densely wound around the front and rear of the guide. When the transmitting coil is energized, it generates a magnetic field that propels the probe forward. After the probe hits the eyeball, it rebounds, and the retrieval coil generates a magnetic field that retrieves the probe back into place. When the probe is launched forward, the retrieval coil generates an induced magnetic field, thus detecting the probe's extension length. When the probe rebounds backward, the retrieval coil generates an induced magnetic field, thus detecting the probe's rebound velocity, thereby calculating the intraocular pressure. This structure is the same as that of existing tonometers.
[0056] The optical fixation module also includes a CCD camera 3-5, a beam splitter 3-6, a convex lens 3-7, and an indicator light 3-8. For example... Figure 7 As shown, the CCD camera, beam splitter, convex lens, and indicator light are all housed within the inner support. The CCD camera is positioned behind the guide member. Figure 7 (On the right side), the beam splitter is positioned between the guide and the CCD camera, the convex lens is positioned in the middle of the guide, and the indicator light is positioned below the beam splitter. Figure 7Below the guide, CCD camera, beam splitter, and convex lens are arranged coaxially. The guide passes axially through the center of the convex lens. The beam splitter is arranged at a 45-degree angle to the central axis of the guide, and the virtual image of the indicator light in the beam splitter is located on the central axis of the guide. The virtual image of the indicator light in the beam splitter is a distant view of the hot air balloon, which the user can observe through the convex lens, thus guiding the user's line of sight and avoiding eye movement during measurement.
[0057] The controller is electrically connected to a shape memory alloy wire motor, a transmitting coil, a retrieval coil, a CCD camera, and indicator lights. The rear of the telescope tube also features a display screen (omitted in the figure) for displaying intraocular pressure data.
[0058] The shape memory alloy wire motor is made of SMA material.
[0059] The controller controls the temperature of the shape memory alloy wire motor by adjusting the duty cycle of the PWM pulse, thereby allowing the shape memory alloy wire motor to extend and shorten.
[0060] The shape memory alloy wire motor is heated when the PWM output is high and cooled when it is low, until a thermal equilibrium is reached, achieving stable temperature control. The electrical heating equation of the shape memory alloy wire motor can be expressed as:
[0061]
[0062] Where: m SMA For the mass of the shape memory alloy wire motor; c p τ is the specific heat of the shape memory alloy wire motor; T(t) is the temperature of the shape memory alloy wire motor; t is time; U is the voltage across the shape memory alloy wire motor. When U = 0, the formula describes the cooling process of the resistance wire; when U > 0, the formula describes the heating process of the resistance wire; R is the resistance value of the SMA wire; τ is the duty cycle of the PWM pulse; h is the convective heat transfer coefficient; A is the surface area of the SMA for convective heat transfer; T0 is the ambient temperature.
[0063] All of the above components are existing technologies and can be purchased externally.
[0064] A method for measuring intraocular pressure includes the following steps:
[0065] Step 1: The user gently places the device in front of their eyes, ensuring that the eye mask fits snugly against the area around the eyes and stabilizes the device position, preparing for subsequent automated measurements.
[0066] Step 2: The indicator light illuminates (the user sees the image of the hot air balloon in the distance). The user should look forward according to the light source of the indicator light, ensuring that the eyeball is relatively still and the direction of the line of sight is fixed, and ensuring that the eyeball is aligned with the center of the rebound pressure measurement module. This is a key prerequisite for the system to perform accurate automatic alignment during subsequent pressure measurement.
[0067] Step 3: The CCD camera captures an image of the eyeball through a beam splitter and lens to obtain the center position of the cornea. The controller determines the deviation between the central axis of the guide and the center of the eyeball based on the image. The position adjustment module adjusts the position of the spring-loaded pressure measurement module so that the central axis of the guide is close to the center of the eyeball. The spring-loaded pressure measurement module is activated, driving the probe to be launched at high speed and gently towards the cornea to locate the center of the cornea.
[0068] (1) Establish a pressure measurement coordinate system at the current position of the rebound pressure measurement module. Figure 5 As shown), the center of the spring-loaded pressure testing module is the origin O, the horizontal direction is the X-axis, and the vertical direction is the Y-axis;
[0069] The position adjustment module drives the spring-loaded pressure testing module to move along the X-axis of the pressure testing coordinate system. Multiple measurement points are set on the X-axis. The spring-loaded pressure testing module impacts and measures the extension length of the probe at each measurement point in sequence. When the extension length of the probe at a certain measurement point is less than the extension length of the probes at the two measurement points on both sides, the measurement point is used as the X-axis measurement coordinate of the pressure testing coordinate system. The position adjustment module drives the spring-loaded pressure testing module to move to the X-axis measurement coordinate.
[0070] The measurement points are distributed on the positive and negative half-axis of the X-axis with a spacing of 1 mm;
[0071] The spring-loaded pressure measurement module first moves to one side to take a measurement. If the probe extension length of the later measurement point is greater than that of the previous measurement point, it indicates that the measurement point is far from the center of the eyeball, and the spring-loaded pressure measurement module needs to be driven to move to the other side to take a measurement. If the probe extension length of the later measurement point is less than that of the previous measurement point, it indicates that the measurement point is close to the center of the eyeball.
[0072] The specific process is as follows:
[0073] like Figure 9 As shown, the rebound pressure measurement module is in the initial position, with the X-axis coordinate marked as X1 and the Y-axis coordinate marked as Y1. The rebound pressure measurement module makes its first impact, with the first impact point of the eyeball being C1 and the extension length of the probe being L1.
[0074] like Figure 10As shown, the spring-loaded pressure sensor module moves 1mm towards the positive half-axis of the X-axis, and the X-axis coordinate is marked as X2. The spring-loaded pressure sensor module performs a second impact, and the second impact point of the eyeball is C2. The extension length of the probe is L2, and L2 is less than L1.
[0075] like Figure 11 As shown, the spring-loaded pressure testing module moves 1mm further to the positive half of the X-axis, and the X-axis coordinate is marked as X3. The spring-loaded pressure testing module performs a third impact, and the third impact point of the eyeball is C3. The extension length of the probe is L3, and L3 is greater than L2.
[0076] Therefore, using X2 as the X-axis measurement coordinate, the position adjustment module drives the spring-loaded pressure measurement module to move to the X-axis measurement coordinate X2;
[0077] (2) Taking the X-axis measurement coordinate of the pressure measurement coordinate system as the reference, the position adjustment module drives the spring-loaded pressure measurement module to move along the direction parallel to the Y-axis of the pressure measurement coordinate system. Multiple measurement points are set on the Y-axis. The spring-loaded pressure measurement module strikes and measures the extension length of the probe at each measurement point in sequence. When the extension length of the probe at a certain measurement point is less than the extension length of the probe at the two measurement points on both sides, the measurement point is used as the Y-axis measurement coordinate of the pressure measurement coordinate system. The position adjustment module drives the spring-loaded pressure measurement module to move to the Y-axis measurement coordinate.
[0078] The measurement points are distributed in a direction parallel to the Y-axis with a spacing of 1 mm;
[0079] The spring-loaded pressure measurement module first moves to one side to take a measurement. If the probe extension length of the later measurement point is greater than that of the previous measurement point, it indicates that the measurement point is far from the center of the eyeball, and the spring-loaded pressure measurement module needs to be driven to move to the other side to take a measurement. If the probe extension length of the later measurement point is less than that of the previous measurement point, it indicates that the measurement point is close to the center of the eyeball.
[0080] The specific process is as follows:
[0081] The spring-loaded pressure testing module is located at (X2, Y1); such as Figure 12 As shown, the spring-loaded pressure sensor module moves 1mm towards the positive half of the Y-axis, and the Y-axis coordinate is marked as Y2. The spring-loaded pressure sensor module performs the fourth impact, and the fourth impact point of the eyeball is C4. The extension length of the probe is L4, and L4 is less than L2.
[0082] The spring-loaded pressure testing module moves 1mm further toward the positive half of the Y-axis, and the Y-axis coordinate is marked as Y3. The spring-loaded pressure testing module performs the fifth impact, and the fifth impact point of the eyeball is C5. The extension length of the probe is L5, and L5 is greater than L4.
[0083] Therefore, using Y2 as the Y-axis measurement coordinate, the position adjustment module drives the spring-loaded pressure measurement module to move to the Y-axis measurement coordinate Y2; at this time, it can be ensured that the probe axis is within 2mm of the center of the cornea;
[0084] Step 4: Using the X-axis and Y-axis measurement coordinates as the pressure measurement points (X2, Y2), the CCD camera captures an image of the eyeball to obtain the axial distance between the eyeball and the probe. The position adjustment module adjusts the axial distance between the rebound pressure measurement module and the eyeball (precisely controlling the safe working distance between the probe and the cornea) to meet the testing requirements (probe distance from the eyeball 6-8mm). The rebound pressure measurement module is activated, driving the probe to be ejected at high speed and gently towards the cornea. Based on the motion parameters of the probe (motion parameters during impact with the cornea and during the rebound process, including the initial velocity of the probe when it hits the eyeball, the acceleration during the impact process, and the time of impact with the eyeball), the intraocular pressure is calculated in real time. A trained random forest algorithm model is used for the calculation, which is an existing method.
[0085] Step 5: End the measurement and remove the device from the user's view.
[0086] Example 2
[0087] The difference from Example 1 is as follows:
[0088] like Figure 14 As shown, the position adjustment module includes an inner support 4-10 that is axially slidably positioned in the telescope tube and four shape memory alloy wire motors arranged parallel to the sliding direction of the inner support and connecting the telescope tube and the inner support.
[0089] The inner wall of the telescope tube is provided with a sliding groove 4-12 to guide the sliding of the inner support. Four shape memory alloy wire motors are evenly arranged around the central axis of the telescope tube, that is, one shape memory alloy wire motor is arranged every 90 degrees along the circumference.
[0090] Each memory alloy wire motor is fixed to the telescope body and inner support at both ends by connectors 4-11. The outer diameter of the memory alloy wire motor is 0.6mm-0.8mm, the wire diameter is 0.2mm-0.3mm, and the length is 18mm-22mm.
[0091] Simultaneously adjusting the current of these four shape memory alloy wire motors allows them to extend and retract simultaneously, thereby moving the spring-loaded pressure measurement module back and forth, and thus adjusting the axial distance between the spring-loaded pressure measurement module and the eyeball.
[0092] A method for measuring intraocular pressure includes the following steps:
[0093] Step 1: The user gently places the device in front of their eyes, ensuring that the eye mask fits snugly against the area around the eyes and stabilizes the device position, preparing for subsequent automated measurements.
[0094] Step 2: The indicator light illuminates (the user sees the image of the hot air balloon in the distance). The user should look forward according to the light source of the indicator light, ensuring that the eyeball is relatively still and the direction of the line of sight is fixed, and ensuring that the eyeball is aligned with the center of the rebound pressure measurement module. This is a key prerequisite for the system to perform accurate automatic alignment during subsequent pressure measurement.
[0095] Step 3: The CCD camera captures an image of the eyeball and obtains the axial distance between the eyeball and the probe. The position adjustment module adjusts the axial distance between the rebound pressure measurement module and the eyeball. The rebound pressure measurement module is activated, driving the probe to be ejected at high speed and gently towards the cornea. The intraocular pressure is calculated in real time based on the motion parameters of the probe.
[0096] Step 4: End the measurement and remove the device from the user's view.
[0097] Example 3
[0098] The difference from Example 2 is that:
[0099] like Figure 15 As shown, the position adjustment module includes an inner bracket 4-10 that is axially slidably positioned in the telescope tube, a sealing element 4-13 disposed between the telescope tube and the inner bracket, a position adjustment cavity 4-14 formed by the sealing element, the inner wall of the telescope tube and the outer wall of the inner bracket, and an air pump (omitted in the figure) connected to the position adjustment cavity.
[0100] The inner support is a cylindrical body with an open front end to ensure that the position adjustment cavity is a sealed cavity. The sealing element seals the gap between the inner wall of the telescope cylinder and the outer wall of the inner support.
[0101] When the air pump inflates, the air pressure in the position adjustment chamber increases, the inner support moves to the left, and the rebound pressure measurement module moves closer to the eyeball. When the air pump deflates, the air pressure in the position adjustment chamber decreases, the inner support moves to the right, and the rebound pressure measurement module moves away from the eyeball.
[0102] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.
Claims
1. An intraocular pressure measuring device, characterized by: The application relates to a telescopic tube (1) with an eyeshade, a rebound pressure measuring module arranged in the telescopic tube, a position adjusting module connecting the telescopic tube and the rebound pressure measuring module, and a controller electrically connecting the position adjusting module and the rebound pressure measuring module.
2. An intraocular pressure measuring device according to claim 1, wherein: The rebound pressure measuring module comprises a guide (3-1), a probe rod (3-2) axially slidably positioned on the guide, a recovery coil (3-4) and a transmitting coil (3-3) arranged at the front and rear ends of the guide respectively.
3. An intraocular pressure measuring device according to claim 2, wherein: An optical fixation module is further arranged in the inner support; the optical fixation module comprises a CCD camera (3-5) arranged behind the guide, a beam splitter (3-6) arranged between the guide and the CCD camera, a convex lens (3-7) arranged in the middle of the guide, and an indicator lamp (3-8) arranged below the beam splitter; the guide, the CCD camera, the beam splitter and the convex lens are coaxially arranged.
4. An intraocular pressure measuring device according to claim 3, wherein: The position adjusting module comprises an outer support (4-9) fixed to the inner wall of the telescopic tube, an inner support (4-10) arranged in the outer support, and eight memory alloy wire motors connecting the outer support and the inner support in a diagonal intersecting mode.
5. An intraocular pressure measuring device according to claim 4, wherein: The memory alloy wire motors are connected to the upper left and right sides, the lower left and right sides, the upper right and left sides and the lower right and left sides of the front and rear parts of the outer support and the inner support respectively; the rebound pressure measuring module is fixed in the inner support.
6. An intraocular pressure measuring device according to claim 3, wherein: The position adjusting module comprises an inner support (4-10) axially slidably positioned in the telescopic tube, and four memory alloy wire motors parallel to the sliding direction of the inner support and connecting the telescopic tube and the inner support.
7. An intraocular pressure measuring device according to claim 3, wherein: The position adjusting module comprises an inner support (4-10) axially slidably positioned in the telescopic tube, a sealing element arranged between the telescopic tube and the inner support, a position adjusting cavity enclosed by the sealing element, the inner wall of the telescopic tube and the outer wall of the inner support, and an air pump communicating with the position adjusting cavity.