Springback type tonometer and intraocular pressure measuring method

Abstract

The invention discloses a springback type tonometer and an intraocular pressure measuring method. Wherein the tonometer comprises a tonometer main body, and the tonometer main body comprises a probe, a driving coil and a measuring coil; a power regulation module; the controller is used for executing the following operations: adjusting the first excitation voltage through the power adjusting module; obtaining a first corresponding relation; determining an actually measured parameter value by using the first corresponding relation through the controller; under the condition that the difference value between the measured parameter value and the target parameter value is greater than a preset threshold value, calculating a correction voltage by using the difference value; correcting the first excitation voltage according to the correction voltage to obtain a target excitation voltage; when the difference value between the measured parameter value and the target parameter value is smaller than or equal to a preset threshold value, determining the first excitation voltage as a target excitation voltage; and measuring the intraocular pressure of the to-be-measured object according to the target excitation voltage to obtain an output intraocular pressure value. According to the embodiment of the invention, the accuracy of intraocular pressure measurement can be improved, and more comfortable use experience is brought to a user.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment, and in particular relates to a rebound tonometer and an intraocular pressure measurement method. Background Art

[0002] Due to the accelerated pace of modern life and the popularity of electronic products, eye health problems have become increasingly prominent, and various eye diseases have occurred frequently. Intraocular pressure, or IOP, is an important indicator for measuring eye health. In order to effectively monitor and prevent the development of eye diseases, especially for some diseases closely related to abnormal IOP, regular IOP measurement plays a vital role in the diagnosis and treatment of various eye diseases. In the related technology, IOP can be measured by a tonometer. In addition, the performance and accuracy of the tonometer have a direct impact on the diagnosis results and treatment effects.

[0003] The rebound tonometer provides a certain amount of initial kinetic energy to the probe through the driving coil, so that the probe hits the cornea, records the displacement and acceleration of the probe, and calculates the intraocular pressure value. Different users' corneas feel different impact force. If the impact force is too strong, it will inevitably cause damage to the cornea; if the impact force is too small, it is impossible to get an accurate measurement value. Therefore, the control of the impact force is a difficult point.

[0004] In addition, in order to avoid the error of a single measurement, when measuring intraocular pressure, the measurement value is usually not given directly for a single measurement, but multiple repeated measurements are used, and the multiple measurement results are calculated to determine the patient's intraocular pressure value. For example, a measurement cycle includes six repeated measurements, and the intraocular pressure reading is given after the six measurements are completed. However, among the multiple measurement data in the same measurement cycle, assuming that the error of one or several times is large, even if the final reading is the result of processing multiple measurement values, due to the influence of the large error measurement, there may still be a large deviation. At this time, the measurement result cannot correctly represent the patient's actual intraocular pressure condition.

[0005] Therefore, how to ensure the accuracy of intraocular pressure values ​​during intraocular pressure measurement while taking into account the user's experience of impact force has become a technical problem that needs to be urgently solved in the industry. Summary of the invention

[0006] The embodiments of the present application provide a rebound tonometer and an intraocular pressure measurement method, which can improve the accuracy of intraocular pressure measurement and bring a more comfortable user experience.

[0007] In a first aspect, an embodiment of the present application provides a rebound tonometer, comprising: a tonometer body, the tonometer body comprising a probe, a drive coil and a measuring coil, wherein the drive coil and the measuring coil partially surround the probe, the drive coil is used to drive the probe to emit and generate displacement along the extension direction of the probe, and the measuring coil is used to detect the motion state of the probe; a power regulation module, the power regulation module is electrically connected to the controller and the drive coil respectively; a controller, the controller is electrically connected to the measuring coil, and is used to perform the following operations: adjusting a first excitation voltage input to the drive coil through the power regulation module, so that the probe is emitted along the extension direction of the probe under the drive of the first excitation voltage; During the process of the needle rebounding in the opposite direction after hitting the cornea, a first corresponding relationship between the first measurement voltage and time in the measuring coil is obtained; the first corresponding relationship is used by the controller to determine the measured parameter value of the probe at the moment of hitting the cornea; when the difference between the measured parameter value and the target parameter value is greater than a preset threshold, the difference is used to calculate the correction voltage; the first excitation voltage is corrected according to the correction voltage to obtain the target excitation voltage; when the difference between the measured parameter value and the target parameter value is less than or equal to the preset threshold, the first excitation voltage is the target excitation voltage; according to the target excitation voltage, the intraocular pressure of the object to be measured is measured to obtain the output intraocular pressure value of the same measurement cycle.

[0008] In a possible implementation of the first aspect, the rebound tonometer also includes: a voltage conversion device, including a power input terminal, a first input terminal, a first output terminal and a feedback terminal; a first voltage regulating module, the first voltage regulating module is connected between the first output terminal and the feedback terminal; a filtering module, one end of the filtering module is connected to the first output terminal, and the other end of the filtering module is connected to the driving coil; wherein the first end of the power regulating module is connected to the controller, and the second end of the power regulating module is connected to the first voltage regulating module; a power supply, the power supply is respectively connected to the power input terminal and the controller of the voltage conversion device.

[0009] In a possible implementation of the first aspect, it further includes a first switch device and a second switch device, the first switch device is located between the filter module and the drive coil, and is connected to the controller; the second switch device is located between the filter module and the measuring coil, and is connected to the controller.

[0010] In a possible implementation of the first aspect, a first voltage-dividing resistor and a second voltage-dividing resistor are further included, wherein the first voltage-dividing resistor is connected between the first switching device and the driving coil, and the second voltage-dividing resistor is connected between the second switching device and the measuring coil.

[0011] In a possible implementation of the first aspect, the power regulation module includes: a second voltage regulating module, a first end of the second voltage regulating module is connected to the controller, and a second end of the second voltage regulating module is connected to the first voltage regulating module; or, a second excitation voltage input module, a first end of the second excitation voltage input module is connected to the controller, and a second end of the second excitation voltage input module is connected to the first voltage regulating module.

[0012] In a possible implementation of the first aspect, the second voltage regulating module includes at least one of the following: a variable resistor, a control end of the variable resistor is connected to a controller, a first end of the variable resistor is connected to the first voltage regulating module, and a second end is grounded; or multiple series resistors are connected to the first voltage regulating module, and each resistor is connected to the controller via a switching device to control whether the corresponding resistor is connected to the second voltage regulating module.

[0013] In a second aspect, an embodiment of the present application provides a method for measuring intraocular pressure, which is applied to the first aspect or any possible implementation of the first aspect, and the method includes: adjusting the first excitation voltage of the input drive coil through a power regulation module, so that the probe is launched along the extension direction of the probe under the drive of the first excitation voltage; in the process of the probe rebounding in the opposite direction after hitting the cornea, obtaining the first correspondence between the first measurement voltage and time in the measuring coil through a controller; determining the actual measured parameter value of the probe at the moment of hitting the cornea through the first correspondence; when the difference between the actual measured parameter value and the target parameter value is greater than a preset threshold, calculating a correction voltage using the difference; correcting the first excitation voltage according to the correction voltage to obtain the target excitation voltage; when the difference between the actual measured parameter value and the target parameter value recommended by the system is less than or equal to the preset threshold, the first excitation voltage is the target excitation voltage; according to the target excitation voltage, measuring the intraocular pressure of the object to be measured to obtain the final measurement result of the same measurement cycle.

[0014] In a possible implementation of the second aspect, the intraocular pressure of the object to be measured is measured according to the target excitation voltage to obtain a final measurement result of the same measurement cycle, including: adjusting the voltage of the input drive coil to the target excitation voltage through a power regulation module; when determining that the first excitation voltage is the target excitation voltage, calculating the intraocular pressure of the object to be measured using the measured parameter value to obtain a single intraocular pressure measurement result, and recording the measurement result as the first measurement result of the same measurement cycle; exciting the drive coil according to the target excitation voltage so that the probe is launched along the extension direction of the probe; in the process of the probe rebounding in the opposite direction after hitting the cornea, obtaining the target correspondence between the second measurement voltage in the measuring coil and the time through a controller; calculating the energy value of the probe at the moment of hitting the cornea according to the target correspondence; calculating the intraocular pressure of the object to be measured using the energy value at the moment of impact to obtain a single measurement result; judging whether N measurements in the same measurement cycle are completed, if so, calculating the final measurement result based on the N single measurement results in the same measurement cycle; if not, returning to exciting the drive coil according to the target excitation voltage until the N measurements in the same measurement cycle are completed.

[0015] In a possible implementation of the second aspect, before stimulating the drive coil according to the target excitation voltage so that the probe is launched along the extension direction of the probe, the method also includes: when determining that the first excitation voltage is the target excitation voltage, using the measured parameter value to calculate the intraocular pressure of the object to be measured, to obtain a single intraocular pressure measurement result, and recording the measurement result as the first single measurement result of the same measurement cycle.

[0016] In a possible implementation of the second aspect, the measured parameter value includes a measured energy value corresponding to the energy parameter, and the target parameter value includes a target energy value corresponding to the energy parameter, and the target parameter value is related to the human-machine distance and corneal sensitivity; the first excitation voltage represents that the driving coil launches the probe at a first time under the excitation of the first excitation voltage, and the probe passes a preset distance and hits the cornea with a target energy value within a second time; through the first corresponding relationship, the measured parameter value of the probe at the moment of hitting the cornea is determined, including: through the first corresponding relationship, the first measurement voltage corresponding to the first time to the second time is integrated to determine the first displacement of the probe, the first displacement represents the distance moved by the probe from the first time to the second time; through the first corresponding relationship between the first measurement voltage and time, the second corresponding relationship between energy and displacement is determined; according to the second corresponding relationship, the energy value corresponding to the first distance is determined as the measured energy value of the probe when it hits the cornea.

[0017] In a possible implementation of the second aspect, the measured parameter value includes a measured speed value corresponding to the speed parameter, and the target parameter value includes a target speed value corresponding to the speed parameter; the first excitation voltage represents that the drive coil is emitted at a first time under the excitation of the first excitation voltage, and the probe passes a preset distance and hits the cornea at a target speed value within a second time; through the first corresponding relationship, the measured parameter value of the probe at the moment of hitting the cornea is determined, including: through the first corresponding relationship, the first measurement voltage corresponding to the time period between the first time and the second time is integrated to determine the first displacement of the probe, the first displacement represents the distance moved by the probe from the first time to the second time; through the first corresponding relationship between the first measurement voltage and time, the second corresponding relationship between energy and displacement is determined; through the second corresponding relationship between energy and displacement and the kinetic energy theorem, the third corresponding relationship between speed and displacement is determined; according to the third corresponding relationship, the speed value corresponding to the first distance is determined as the measured speed value of the probe when it hits the cornea.

[0018] In a possible implementation of the second aspect, the second correspondence between energy and displacement is determined by utilizing the first correspondence between the first measured voltage and time, including: determining the fourth correspondence between driving force and displacement by using the first correspondence between the first measured voltage and time and the force relationship of the probe; determining the second correspondence between energy and displacement by using the fourth correspondence between driving force and displacement.

[0019] In a possible implementation of the second aspect, when the difference between the measured parameter value and the target parameter value is greater than a preset threshold value, the difference is used to calculate the correction voltage, including: calculating the energy difference between the measured energy value and the target energy value; calculating the distance difference between the first displacement and the preset distance; calculating the correction driving force through the distance difference and the energy difference; and determining the correction voltage corresponding to the correction driving force using the magnetic energy formula.

[0020] In a possible implementation of the second aspect, when the difference between the measured parameter value and the target parameter value is greater than a preset threshold value, the difference is used to calculate the correction voltage, including: calculating the speed difference between the measured speed value and the target speed value; calculating the correction energy through the speed difference; calculating the distance difference between the first displacement and the preset distance; calculating the correction driving force through the distance difference and the correction energy; and determining the correction voltage corresponding to the correction driving force through the magnetic energy formula.

[0021] In a possible implementation of the second aspect, before adjusting the first excitation voltage of the input drive coil through the power regulation module so that the probe is launched along the extension direction of the probe under the drive of the first excitation voltage, the method includes: outputting a second excitation voltage to the measuring coil through the controller so that the probe is pulled back to the initial position along the extension direction of the probe.

[0022] The tonometer of the embodiment of the present application includes a tonometer body, a power regulating module and a controller. The controller can control the power regulating module to output a first excitation voltage to the driving coil in the tonometer body, so that the probe in the tonometer body hits the cornea of ​​the object to be measured under the drive of the first excitation voltage. After the probe hits the cornea of ​​the object to be measured, the probe will rebound. At this time, the controller can determine the measured parameter value of the probe when it hits the cornea through the first corresponding relationship between the first measurement voltage generated in the measuring coil in the tonometer body and the time. By calculating the difference between the measured parameter value actually generated when the probe hits the cornea of ​​the object to be measured and the target parameter value, it can be determined whether the magnitude of the first excitation voltage needs to be adjusted. When it is determined that the difference is greater than the preset threshold, it can be determined that when the probe is driven according to the first excitation voltage, it will cause discomfort to the user, or it will be detrimental to the accuracy of intraocular pressure measurement. Therefore, the voltage value that needs to be adjusted for the first excitation voltage can be determined by the difference, that is, the correction voltage is calculated. Further, the first excitation voltage can be corrected by the correction voltage to obtain the target excitation voltage. The above process can be regarded as a trial period within the factory-set safety range. Through the trial period, the optimal excitation voltage suitable for corneal sensitivity is found. After finding the optimal excitation voltage, the formal measurement period is started, which can ensure the consistency of the probe excitation voltage at the same human-machine distance, ensure the relative accuracy of each measurement, and ultimately ensure the accuracy of the intraocular pressure value given by the system after the same measurement period. Therefore, when measuring intraocular pressure according to the target excitation voltage, it can ensure accurate measurement of intraocular pressure and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of the structure of a rebound tonometer provided by an embodiment of the present application is shown;

[0025] Figure 2 A schematic diagram of the circuit architecture of a rebound tonometer provided in another embodiment of the present application is shown;

[0026] Figure 3 A schematic diagram of the circuit architecture of a rebound tonometer provided in yet another embodiment of the present application is shown;

[0027] Figure 4 A circuit diagram of a second voltage regulating module provided in one embodiment of the present application is shown;

[0028] Figure 5 A circuit diagram of a second voltage regulating module provided in another embodiment of the present application is shown;

[0029] Figure 6 A circuit diagram of a second excitation voltage input module provided by an embodiment of the present application is shown;

[0030] Figure 7 A circuit diagram of a second excitation voltage input module provided in another embodiment of the present application is shown;

[0031] Figure 8 A flow chart of an intraocular pressure testing method provided by an embodiment of the present application is shown;

[0032] Fig. 9 A schematic diagram showing a fourth corresponding relationship provided by an embodiment of the present application is shown;

[0033] Fig.10 A schematic diagram showing a second corresponding relationship provided by an embodiment of the present application is shown;

[0034] Fig.11 A schematic diagram of a third corresponding relationship provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0035] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, 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 and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] The inventors have found that for a single measurement, the probe is ejected after being charged by the drive coil, and energy is lost due to friction and other resistances on the forward path. The energy remaining in the probe at the moment of impact with the cornea determines the impact force on the cornea. Therefore, within the same measurement cycle, as long as the residual energy at the moment of impact with the cornea is consistent, the impact force can be guaranteed to be consistent, and the consistency of the intraocular pressure values ​​measured within the same measurement cycle can be guaranteed. The "same measurement cycle" mentioned here is the default that the user keeps the distance between the tonometer and the cornea unchanged after determining the distance.

[0038] To this end, the embodiments of the present application provide a rebound tonometer and an intraocular pressure measurement method. The rebound tonometer provided by the embodiments of the present application is first introduced in conjunction with the following embodiments. The "human-machine distance" hereinafter refers to the distance between the human cornea and the proximal end of the tonometer body (excluding the probe). The "final measurement result" hereinafter refers to the intraocular pressure value calculated and output to the user at the end of the same measurement cycle, and is therefore the same concept as the output intraocular pressure value of the same measurement cycle.

[0039] For ease of understanding, in the embodiments of the present application, the architecture of the rebound tonometer is first described, and then its functions are described.

[0040] Figure 1 FIG. 1 shows a schematic diagram of the architecture of a tonometer provided by an embodiment of the present application. Figure 1 As shown, the tonometer 100 in the embodiment of the present application includes a tonometer body 110, and the tonometer body 110 includes a probe 10, a driving coil 20 and a measuring coil 30, wherein the driving coil 20 and the measuring coil 30 partially surround the probe, the driving coil 20 is used to drive the probe 10 to emit and generate displacement along the extending direction of the probe, and the measuring coil 30 is used to detect the motion state of the probe 10;

[0041] The power regulation module 120 is electrically connected to the controller 130 and the driving coil 20 respectively;

[0042] The controller 130 is electrically connected to the measuring coil 30 .

[0043] Among them, the controller 130 can be used to perform the following steps: adjust the first excitation voltage input to the drive coil 20 through the power adjustment module 120, so that the probe 10 is launched along the extension direction of the probe under the drive of the drive coil 20 and hits the cornea of ​​the object to be measured; in the process of the probe 10 rebounding after hitting the cornea, obtain the first correspondence between the first measurement voltage and time in the measuring coil 30; determine the measured parameter value of the probe 10 at the moment of hitting the cornea by using the first correspondence through the controller 130; when the difference between the measured parameter value and the target parameter value is greater than the preset threshold, calculate the correction voltage by using the difference; correct the first excitation voltage according to the correction voltage to obtain the target excitation voltage; when the difference between the measured parameter value and the target parameter value is less than or equal to the preset threshold, determine the first excitation voltage as the target excitation voltage; adjust the voltage input to the drive coil 20 to the target excitation voltage through the power adjustment module 120, and complete multiple measurements of the intraocular pressure of the object to be measured in the same measurement cycle under this target excitation voltage to obtain the final measurement result.

[0044] Those skilled in the art can understand that the first excitation voltage is an attempted excitation voltage for a trial period of the user according to his or her own human-machine distance and corneal sensitivity, and the first excitation voltage is a voltage within the safety range that complies with the factory settings. The preset threshold is a value pre-stored in the system to ensure that the rebound tonometer is safe to use and complies with regulatory requirements. The so-called target parameter value can be a speed value and / or energy value interval of the probe hitting the cornea of ​​the object to be measured that is preset by the system and corresponds to different human-machine distances and corneal sensitivities. Among them, the size of the target parameter value can be pre-set by a technician based on an empirical value, or the size of the target parameter value can also be set by the user according to his or her own different needs. The measured parameter value refers to the speed value and / or energy value actually measured at the moment of impact. Furthermore, the first excitation voltage can be the probe excitation voltage used by the user for trial hitting within the factory safety range according to the relevant specifications of the tonometer. Ideally, it is the target excitation voltage value calculated according to the target parameter value when the probe hits the cornea.

[0045] Exemplarily, the probe 10 may include a magnetic part and a plastic part, wherein the plastic part covers the end of the magnetic part so that the two are fixedly connected. In addition, the magnetic sleeve also includes a probe catheter and a coil holder, wherein the probe 10 is installed in the probe catheter, which may be made of metal, and the coil holder is sleeved outside the probe catheter for installing the driving coil 20 and the measuring coil 30. The distance between the proximal end of the magnetic part of the probe 10 and the proximal end of the driving coil 20 is L1.

[0046] Exemplarily, the controller 130 changes the voltage output to the drive coil 20 by controlling the power adjustment module 120, thereby changing the excitation voltage applied by the drive coil 20 to the probe 10, so that the probe 10 in the drive coil 20 can move in the direction of the cornea of ​​the object to be measured with different initial energies or different initial speeds. Exemplarily, after the probe 10 hits the cornea of ​​the object to be measured, it will rebound along the extension direction of the probe 10. During the rebound process, the probe 10 moves in the measuring coil 30, and the voltage in the measuring coil 30 changes. The controller 130 can determine the intraocular pressure value of the object to be measured by detecting the change in the voltage in the measuring coil 30. In an example, it can be understood that after the probe hits the cornea of ​​the object to be measured, the parameter values ​​of the probe, such as velocity, acceleration, displacement and energy, will also change. Therefore, the changed parameter values ​​can be obtained in real time by the sensor to determine the intraocular pressure value of the object to be measured. For example, the velocity of the probe before and after hitting the cornea of ​​the object to be measured can be obtained by a velocity sensor or an acceleration sensor, and the intraocular pressure value of the object to be measured can be calculated using a related formula. In one example, the speed sensor may be a measuring coil 30 .

[0047] In some optional embodiments, the probe 10 can be launched from a preset initial position. The initial position of the probe 10 can be a position corresponding to a preset distance L1 between the first end 11 of the magnetic part of the probe 10 and the first end 21 of the driving coil 20. It can be understood that launching the probe at the same initial position is beneficial to improving the accuracy of intraocular pressure measurement. In order to achieve that the probe 10 is launched from the same initial position each time the measurement is performed, it is necessary to pull the measured coil 30 back to the initial position after each impact of the probe 10 on the cornea, that is, the distance between the proximal end / first end 11 of the magnetic part of the probe 10 and the proximal end / first end 21 of the driving coil 20 is the preset distance L1. The specific method of pulling the probe back will be discussed later.

[0048] In the embodiment of the present application, the controller 130 changes the voltage input to the drive coil 20 by controlling the power regulation module 120, so that the probe can impact the cornea of ​​the object to be tested with the target parameter value, thereby improving the accuracy of the intraocular pressure test.

[0049] Furthermore, Figure 2 FIG. 2 shows a schematic diagram of a circuit structure of a rebound tonometer provided by another embodiment of the present application. Figure 2As shown, the tonometer 100 in the embodiment of the present application also includes: a voltage conversion device 140, including a power input terminal, a first input terminal, a first output terminal and a feedback terminal, and the controller 130 is connected to the first input terminal of the voltage conversion device 140; a first voltage regulation module 150, and the first voltage regulation module 150 is connected between the first output terminal and the feedback terminal of the voltage conversion device 140; a filter module 160, one end of which is connected to the first output terminal of the voltage conversion device 140, and the other end is connected to the drive coil 20; wherein one end of the power regulation module 120 is connected to the controller 130, and the other end is connected to the first voltage regulation module 150; and a power supply 170, the power supply 170 is respectively connected to the power input terminal of the voltage conversion device 140 and the controller 130, to supply power to each component.

[0050] Exemplarily, the voltage conversion device 140 is used to achieve conversion between different voltage levels and realize the function of voltage stabilization and efficiency enhancement. In one example, the voltage conversion device 140 can be a DC-DC. It is understandable that the voltage conversion device can also be other devices with a feedback terminal and used to achieve voltage conversion. The present application does not limit the specific structure of the voltage conversion device. For ease of understanding, Figure 3 FIG. 1 shows a schematic diagram of a circuit structure of a rebound tonometer provided by another embodiment of the present application, wherein: Figure 3 The specific connection method of the voltage conversion device, the first voltage regulating module and other structures is shown.

[0051] The first voltage regulating module 150 is connected between the first output terminal and the feedback terminal of the voltage conversion device 140, so as to adjust the output voltage of the voltage conversion device 140. By feeding back a part of the voltage signal to the voltage conversion device 140, the voltage conversion device 140 can adjust its own working state in time to maintain the stability of the output voltage. The first voltage regulating module 150 may include a first resistor R1 and a second resistor R2. Among them, one end of the first resistor R1 is connected to the first output terminal of the voltage conversion device 140, and the other end is connected to the feedback terminal of the voltage conversion device 140. One end of the second resistor R2 is connected to the feedback terminal, and the other end is grounded. By feeding back the voltage between the first resistor R1 and the second resistor R2 to the voltage conversion device 140, the purpose of adjusting the output voltage of the voltage conversion device 140 is achieved.

[0052] Furthermore, in the presence of the power regulation module 120, since the power regulation module 120 is connected to the middle node of the first resistor R1 and the second resistor R2, the voltage of the middle node of the first resistor R1 and the second resistor R2 can be adjusted through the power regulation module 120, and the adjusted voltage can be fed back to the voltage conversion device 140, thereby achieving the purpose of adjusting the output voltage of the voltage conversion device 140 under the control of the controller 130.

[0053] Exemplarily, the filter module 160 is used to filter the voltage output by the voltage conversion device 140 to improve the stability of the voltage. In one example, the filter module 160 can be composed of a first capacitor C1, one end of the first capacitor C1 is connected to the first output end of the voltage conversion device 140, and the other end of the first capacitor C1 is grounded.

[0054] Therefore, under the action of the controller 130, the voltage conversion device 140, the first voltage regulating module 150, the filter module 160 and the power regulating module 120, the driving voltage VCC is output to the driving coil 20 or the measuring coil 30. Those skilled in the art will know that the driving voltage VCC is the voltage output by the adjusted circuit architecture.

[0055] Optionally, the circuit architecture of the tonometer 100 may further include a first switch device Q1 and a second switch device Q2. The first switch device Q1 is located between the filter module 160 and the drive coil 20, and the control end of the first switch device Q1 is connected to the controller 130. The controller 130 controls the first switch device Q1 to control whether the drive voltage VCC can flow into the drive coil 20. The second switch device Q2 is located between the filter module 160 and the measuring coil 30, and the control end of the second switch device Q2 is connected to the controller 130. The controller 130 controls the second switch device Q2 to control whether the voltage of the drive voltage VCC can flow into the measuring coil 30. In one example, the first switch device Q1 and the second switch device Q2 may be transistors, including an on state and an off state, and the state of the transistor is controlled by the controller 130. The first switch device Q1 is a P-channel metal-oxide semiconductor field-effect transistor (PMOS) as an example for explanation, the gate of the PMOS tube is connected to the controller 130, the drain is connected to the driving voltage VCC, and the source is connected to the driving coil 20. When the controller 130 outputs a low level to the gate of the PMOS tube, the PMOS tube is turned on, and the voltage of the driving voltage VCC can flow to the driving coil 20; when the controller 130 outputs a high level to the gate of the PMOS tube, the PMOS tube is turned off, and the voltage of the driving voltage VCC cannot flow into the driving coil 20, and the driving coil 20 does not work.

[0056] Optionally, the circuit architecture of the tonometer 100 further includes a first voltage-dividing resistor R0 and a second voltage-regulating module resistor R0'. The first voltage-dividing resistor R0 is connected between the output end of the first switch device Q1 and the driving coil 20; the second voltage-regulating module resistor R0' is connected between the output end of the second switch device Q2 and the measuring coil 30. The circuit is protected by the voltage-dividing resistors R0 and R0'.

[0057] The controller 130 controls the first switch device Q1 and the second switch device Q2 to control the power supply and power cut of the driving coil 20 and the measuring coil 30. Figure 3 The circuit architecture uses the same set of driving circuits to provide the required voltages to the driving coil 20 and the measuring coil 30, respectively. For example, when the probe needs to be pulled back, the measuring coil 30 is powered; when the probe needs to be launched, the driving coil 20 is powered. It can be understood by those skilled in the art that the various implementations of the power regulation module 120 described below can be used for Figure 3 Circuit architecture.

[0058] In the present application, the power regulation module 120 performs power regulation in two ways: one is to change the voltage flowing into the control coil through resistance, and the other is to directly change the voltage flowing into the drive coil 20 by adding a voltage input device.

[0059] For ease of understanding, the present application provides the following embodiments to illustrate the process of power regulation by the power regulation module 120 in two ways, wherein in the embodiments provided in the present application, the voltage conversion device is taken as an example of DCDC. It can be understood that, limited by the connection mode and performance of DCDC, when the voltage at the feedback end of DCDC is changed, the actual output voltage of DCDC will be changed. In addition, there is the following relationship between the actual output voltage and the voltage at the feedback end:

[0060]

[0061] Wherein, Vout is the actual output voltage of DCDC; Vref is the voltage at the feedback end of DCDC, where the value of Vref is determined by the DCDC architecture itself; R1 and R2 are the impedances corresponding to the first resistor and the second resistor in the first voltage regulation module (wherein the connection relationship between the first resistor and the second resistor can be referred to Figure 3 ).

[0062] In some optional embodiments, such as Figure 4 or Figure 5 As shown, the power regulating module 120 is a second voltage regulating module 121, a first end of the second voltage regulating module 121 is connected to the controller 130, a second end is connected to the first voltage regulating module 150, and a third end is grounded GND. The second voltage regulating module is used to change the resistance value of the resistor connected in the circuit, so that the voltage input to the driving coil 20 changes. Specifically, the second voltage regulating module 121 is connected to the second resistor R2, and by changing the total resistance of R2 and the second voltage regulating module 121, the voltage fed back to the voltage conversion device 140 by adjusting the node between the first resistor R1 and the second resistor R2.

[0063] Specifically, in one example, Figure 4As shown, when the power regulating module 120 is a second voltage regulating module 121, the second voltage regulating module 121 can be composed of a plurality of resistors connected in series. The plurality of resistors connected in series may include R3, R4, ..., Rn, and the resistance value of each resistor may be the same or different. Each resistor may be configured with a corresponding switch K0 to control whether the resistor is connected to the circuit. The on or off of each switch K0 may be controlled by the controller 130. Alternatively, the switch K0 may be controlled by the user of the rebound tonometer ( Figure 4 For example, the switch K0 may be a control button, and the user of the rebound tonometer changes the size of the resistor connected in the circuit by pressing different control buttons, thereby adjusting the input voltage of the driving coil.

[0064] In another example of changing voltage through resistance, Figure 5 As shown, the power adjustment module 120 is a variable resistor 1211, and the resistance of the variable resistor 1211 connected to the circuit is adjusted by the controller 130. One end of the variable resistor 1211 is connected to the controller 130, and the other end is connected to the first voltage adjustment module 150. The power supply 170 supplies power to the variable resistor 1211, and the third end of the variable resistor 1211 is grounded. In one example, the variable resistor 1211 can be a digital potentiometer.

[0065] It can be understood that in the above-mentioned embodiment of changing the resistance, by changing the voltage division of the DCDC feedback voltage by the resistance, it is equivalent to changing the overall impedance of R2 in formula (1) (that is, the overall resistance of the second resistor R2 and the second voltage regulation module 121), thereby adjusting the actual output voltage Vout of the DCDC.

[0066] In some optional embodiments, the voltage input to the driving coil 20 is changed by the voltage input device. Figure 6 or Figure 7 shown. Figure 6 is a schematic diagram of the circuit structure of another embodiment, such as Figure 6 As shown, the power regulating module 120 is a second excitation voltage input module 122, one end of the second excitation voltage input module 122 is connected to the controller 130, and the other end is connected to the first voltage regulating module 150. The voltage of the access circuit is changed by the second excitation voltage input module 122, so that the voltage input to the driving coil 20 changes.

[0067] Specifically, Figure 6As shown, the power regulating module 120 can be used as a second excitation voltage input module 122, which outputs a voltage signal to the first voltage regulating module 150. Wherein, the voltage signal can be a PWM signal. In addition, the power regulating module 120 also includes a low-pass filter 124 after the output PWM signal, filtering the output PWM signal. Wherein, the low-pass filter 124 is composed of a fourth resistor R4 and a second capacitor C2, the first end of the fourth resistor R4 receives the PWM signal output by the MCU, and the second end of the fourth resistor R4 is connected to the first voltage regulating module 150. One end of the second capacitor C2 is connected to the second end of the fourth resistor R4, and the other end of the second capacitor C2 is grounded. It can be understood that, in order to protect the circuit, the power regulating module 120 also includes a third resistor R3, and the third resistor R3 is connected in series between the low-pass filter 124 and the first voltage regulating module 150 to avoid circuit short circuit.

[0068] In another example, Figure 7 FIG. 1 shows a circuit diagram of a second excitation voltage input module 122 provided in another embodiment of the present application. Figure 7 As shown, the second excitation voltage input module 122 may include a digital to analog converter (DAC) for converting a digital signal into an analog voltage or current output. The first end of the second excitation voltage input module 122 may be connected to the controller 130, the second end is connected to the first voltage regulating module 150, the third end is grounded, and the power supply 170 supplies power to it. Similarly, the second excitation voltage input module 122 also includes a third resistor R3 connected in series between the DAC and the first voltage regulating module 150 to prevent the circuit from being short-circuited.

[0069] In another example, the voltage conversion device 140 is a programmable voltage regulator, such as a linear regulator and / or a switching regulator. In this example, the programmable switching regulator adjusts the output voltage through a digital interface to meet different voltage requirements.

[0070] In another example, Figure 3 For example, the controller 130 can change the voltage input to the driving coil 20 by adjusting the switching frequency of the first switching device Q1. It is understandable that the controller 130 can adjust the switching frequency of the first switching device by changing the duty ratio of the high and low levels in the driving signal input to the first switching device Q1, thereby changing the voltage input to the driving coil 20.

[0071] It can be understood that in the above-mentioned embodiment of changing the voltage, by inputting a voltage to the DCDC feedback terminal, or directly changing the voltage input to the DCDC, it is equivalent to changing the voltage value of the DCDC feedback terminal Vref in formula (1), thereby adjusting the actual output voltage Vout of the DCDC.

[0072] It is understandable that the above embodiment is only an exemplary description of the voltage conversion device as DCDC. For other voltage feedback devices, there may be other corresponding relationships between the feedback terminal and the actual output voltage. Therefore, the power regulation module, connection relationship and regulation method involved in the above embodiment are only for exemplary description, and the voltage in the circuit can also be adjusted by other devices or electronic devices. In the embodiments of the present application, this is not limited.

[0073] In the embodiment of the present application, the voltage input to the driving coil 20 can be changed by the power regulation module 120 .

[0074] The following is an introduction to the intraocular pressure testing method using the rebound tonometer provided in the embodiments of the present application.

[0075] Figure 8 FIG. 1 is a flow chart showing an intraocular pressure testing method provided by an embodiment of the present application. Figure 8 As shown, the intraocular pressure testing method in the embodiment of the present application comprises the following steps:

[0076] S810 , adjusting the first excitation voltage input to the driving coil 20 through the power adjustment module 120 , so that the probe 10 is driven by the first excitation voltage to emit along the extending direction of the probe.

[0077] The first excitation voltage is an attempted excitation voltage within a factory-set safety range during a trial period, and is ideally a target excitation voltage calculated by a technician based on a target parameter value.

[0078] The driving coil 20 charges the probe under the drive of the first excitation voltage, so that the probe can impact the cornea of ​​the object to be tested.

[0079] Exemplarily, the power regulating module 120 can change the first excitation voltage output by the voltage conversion device 140, and the driving coil 20 can generate a certain driving force under the excitation of the first excitation voltage, so that the probe in the driving coil is emitted along the extension direction of the probe.

[0080] Exemplarily, the size of the target parameter value can be pre-set by the technician based on the experience value, or set by the user according to different needs. In one example, the technician presets the expected speed value or its corresponding energy value at the moment of impact on the cornea as the target parameter value based on experience at the factory, and the intraocular pressure calculated and measured at this speed is relatively objective within the allowable range. It means that under the target driving voltage, the probe is driven to emit, and at the recommended distance between the tonometer and the cornea, the speed value / energy value at the moment of impact is the target parameter value. In another example, if the user is more sensitive to the touch when the probe hits the eyeball, the size of the target parameter value can be set to a lower threshold, thereby reducing the user's discomfort when the probe hits the eyeball. Among them, it can be understood that the set lower threshold can be a smaller value in a parameter range that meets the measurement requirements of intraocular pressure. It should be noted that the target parameter value is adjusted between the maximum and minimum values ​​preset by the system under the premise of meeting the functional realization and safety requirements of the tonometer.

[0081] S820 . When the probe 10 rebounds in the opposite direction after striking the cornea, the controller 130 obtains a first corresponding relationship between a first measurement voltage in the measurement coil 30 and time.

[0082] Exemplarily, the probe 10 rebounds after hitting the cornea of ​​the object to be measured, and the probe is displaced in the measuring coil 30, thereby generating a first measuring voltage. The controller 130 is connected to the measuring coil 30, and can obtain a first corresponding relationship between the first measuring voltage generated in the measuring coil 30 and time, that is, obtain a function of the first measuring voltage and time.

[0083] S830 , using the first corresponding relationship, the controller 130 determines the actual measured parameter value of the probe 10 at the moment of impacting the cornea.

[0084] Exemplarily, the controller 130 can calculate the measured parameter value when the probe 10 hits the cornea of ​​the object to be measured according to the first corresponding relationship. The measured parameter value is used to characterize the parameter value actually generated when the probe hits the cornea of ​​the object to be measured. The parameter value is, for example, an instantaneous velocity value, an acceleration value, an energy value, etc., and the parameter value is related to the energy at the moment of impact.

[0085] Exemplarily, the first corresponding relationship may be a corresponding relationship between the first measured voltage and time. Also, the first corresponding relationship may be acquired by the controller 130 .

[0086] S840: When the difference between the measured parameter value and the target parameter value is greater than a preset threshold, calculate a correction voltage using the difference.

[0087] Exemplarily, the controller 130 may calculate the difference between the measured parameter value and the target parameter value, and when the difference is greater than a preset threshold, calculate the correction voltage using the difference.

[0088] In one example, the difference between the first measured value and the target parameter value may represent the difference between the parameter value actually carried by the probe when it hits the cornea and the parameter value required by the technician or the user.

[0089] S850: Correct the first excitation voltage according to the correction voltage to obtain a target excitation voltage.

[0090] Exemplarily, the controller 130 may correct the first excitation voltage using the calculated correction voltage to obtain a target excitation voltage.

[0091] S860: When the difference between the measured parameter value and the target parameter value is less than or equal to a preset threshold, determine the first excitation voltage as the target excitation voltage.

[0092] Exemplarily, when the controller 130 determines that the difference between the measured parameter value and the target parameter value is less than or equal to a preset threshold, the first excitation voltage may be used as the target excitation voltage.

[0093] S870. Measure the intraocular pressure of the object to be measured according to the target excitation voltage to obtain a final measurement result of the same measurement cycle.

[0094] Exemplarily, the controller can adjust the voltage by controlling the power regulating module 120, output the target excitation voltage to the drive coil 20 through the power regulating module 120, and implement the test of the intraocular pressure of the object to be tested based on the target excitation voltage. It should be noted that in step S860, the distance between the user's cornea and the tonometer is determined, and the target excitation voltage is determined. On this basis, the user starts a measurement cycle, that is, multiple repeated measurements are performed. In this measurement cycle, the intraocular pressure values ​​measured each time are basically the same, and the output intraocular pressure value of the measurement cycle given by calculation can truly reflect the intraocular pressure condition.

[0095] In the embodiment of the present application, the controller 130 can control the power regulating module 120 to output the first excitation voltage to the driving coil 20 in the tonometer body, so that the probe in the tonometer body hits the cornea of ​​the object to be measured under the drive of the first excitation voltage. After the probe hits the cornea of ​​the object to be measured, the probe will rebound. At this time, the controller 130 can determine the measured parameter value of the probe 10 when it hits the cornea through the first corresponding relationship between the first measurement voltage generated in the measuring coil 30 in the tonometer body and time. By calculating the difference between the measured parameter value actually generated by the probe 10 when it hits the cornea of ​​the object to be measured and the target parameter value, it can be determined whether the magnitude of the first excitation voltage needs to be adjusted.

[0096] When it is determined that the difference is greater than the preset threshold, it can be determined that when the probe 10 is driven according to the first excitation voltage, it will cause discomfort to the user, or it will be detrimental to the accuracy of the intraocular pressure measurement. Therefore, the voltage value that needs to be adjusted for the first excitation voltage can be determined by the difference, that is, the correction voltage is calculated. Further, the first excitation voltage can be corrected by the correction voltage to obtain the target excitation voltage. When the intraocular pressure is measured according to the target excitation voltage, it is ensured that the probe can hit the cornea of ​​the object to be measured with the target parameter value, thereby ensuring the consistency of the intraocular pressure measurement results and improving the accuracy of the intraocular pressure measurement. Further, it can be understood that measuring the object to be measured according to the target parameter value can be used to have a better user experience when performing intraocular pressure measurement, reducing the user's discomfort during the intraocular pressure measurement process.

[0097] If the difference is less than or equal to the preset threshold, the first excitation voltage is considered to be the target excitation voltage, and the measurement is regarded as the first measurement in a measurement cycle.

[0098] In some optional embodiments, step S860 may include the following steps:

[0099] S861. Regulate the voltage of the input drive coil to the target excitation voltage through the power regulation module.

[0100] For example, the controller 130 may adjust the voltage input to the driving coil 20 to the target excitation voltage through the power regulation module.

[0101] In special cases, when the first excitation voltage is determined to be the target excitation voltage, the intraocular pressure of the object to be measured is calculated using the measured parameter value to obtain a single intraocular pressure measurement result, and the measurement result is recorded as the first measurement result of the same measurement cycle.

[0102] It is understandable that in order to improve the user experience of the rebound tonometer, when the probe hits the user's cornea under the first excitation voltage, the measured parameter value can meet the target parameter value. At this time, the measurement process can be regarded as the first measurement in the same measurement cycle. The intraocular pressure of the object to be measured is calculated by the measured parameter value to obtain a single intraocular pressure measurement result.

[0103] S862, exciting the driving coil according to the target excitation voltage to cause the probe to be emitted along the extending direction of the probe.

[0104] Exemplarily, under the target excitation voltage, the probe may be launched along the extending direction of the probe and impact the cornea of ​​the subject to be tested.

[0105] S863. When the probe rebounds in the opposite direction after striking the cornea, a target corresponding relationship between a second measurement voltage in the measurement coil and time is obtained through a controller.

[0106] The second measurement voltage may be a voltage generated when the probe moves in the measurement coil 30 after hitting the cornea with the target parameter value. For example, after the probe hits the cornea of ​​the object to be measured with the target parameter value, rebound occurs, at which time, the probe generates a second measurement voltage in the measurement coil.

[0107] Furthermore, the controller 130 may obtain a correspondence between the second measured voltage and time as a target correspondence.

[0108] S864. Calculate the energy value of the probe at the moment of impacting the cornea according to the target correspondence.

[0109] Exemplarily, the controller 130 may obtain the target correspondence between the second measurement voltage and time in the measuring coil 30, and calculate the energy value of the probe at the moment of impacting the cornea according to the obtained target correspondence. In one example, the energy value of the probe at the moment of impacting the cornea may be calculated by a relevant formula, such as a magnetic energy formula.

[0110] S865. Calculate the intraocular pressure of the object to be measured using the energy value at the moment of impact to obtain a single measurement result.

[0111] It should be noted that in actual operation, the measurement result is only recorded and stored, and is not used as the final intraocular pressure measurement result.

[0112] Exemplarily, the controller 130 can determine the intraocular pressure value of the object to be measured by the calculated energy value. And the determined intraocular pressure value is used as a single measurement result. In one example, the intraocular pressure of the object to be measured can be determined according to the energy difference before and after the probe hits the cornea of ​​the object to be measured by calculating the energy difference.

[0113] S866. Determine whether N measurements within the same measurement cycle are completed; if so, execute S867; if not, return to S862.

[0114] S868. Calculate and obtain a target measurement result based on the N single measurement results in the same measurement cycle.

[0115] Exemplarily, the controller 130 may determine whether the current measurement result is the Nth measurement result. If the controller 130 determines that the current measurement result is the Nth measurement result, the target measurement result may be calculated using the obtained N measurement results. The target measurement result may be the actual measurement result obtained by the user. In one example, the average of N single measurement results may be calculated, and the average may be used as the actual measurement result. In another example, the weighted average of N single measurement results may be calculated, and the weighted average may be used as the actual measurement result.

[0116] It can be understood that the N measurement results used to calculate the intraocular pressure value of the object to be measured are N measurement results generated under the drive of the target excitation voltage. In one example, if the difference between the measured parameter value and the target parameter value is greater than the preset threshold, the target excitation voltage can be calculated first, and after the target excitation voltage is calculated, the N measurement results driven by the target excitation voltage are obtained. In another example, if the difference between the measured parameter value and the target parameter value is less than or equal to the preset threshold, the first excitation voltage can be used as the target drive voltage, and this measurement result can be used as the first of the N measurement results. Further, under the drive of the first excitation voltage, N-1 measurement results are obtained to determine the output intraocular pressure value of this measurement cycle.

[0117] Wherein, one measurement cycle includes N measurements, and N may be a positive integer. Moreover, N may be determined by a technician based on an empirical value. For example, N may be 6, that is, the actual result of the intraocular pressure measurement may be determined based on 6 measurement results.

[0118] In the embodiment of the present application, the intraocular pressure of the object to be measured can be measured N times according to the target excitation voltage, and the actual intraocular pressure measurement result can be determined based on the N measurement results. In this way, the final intraocular pressure measurement result has better accuracy.

[0119] For example, the parameter value can be used to measure the physical characteristics of the probe at the moment of impacting the cornea of ​​the object to be measured. The measured parameter value can be the physical characteristics of the probe at the moment of impacting the cornea when the probe is driven according to the first excitation voltage; the target parameter value can be the ideal value of the physical characteristics of the probe at the moment of impacting the cornea, which is preset by the technician.

[0120] Exemplarily, the parameter may be an energy parameter or a speed parameter. Therefore, when the parameter value is a different physical quantity, the determination method thereof is also different. The following examples are combined to introduce the determination process of the first energy value and the first speed value when the parameter is an energy parameter and the parameter is a speed parameter, respectively.

[0121] In some optional embodiments, when the measured parameter is an energy parameter, step S830 in the embodiment of the present application may include the following steps:

[0122] S831. Integrate the first measurement voltage corresponding to the first time to the second time according to the first corresponding relationship to determine the first displacement of the probe.

[0123] The first measurement voltage is the voltage generated in the measuring coil 30 after the probe 10 hits the cornea under the drive of the first excitation voltage. The driving coil charges the probe under the excitation of the first excitation voltage, so that the probe 10 is fired at the first time, and the probe 10 passes the preset distance and hits the cornea with the target parameter value at the second time. It can be understood that the preset distance can be the distance value between the probe and the cornea of ​​the object to be measured, which is predetermined during the manufacturing process of the tonometer.

[0124] The first displacement represents the distance the probe moves from the first time to the second time. The first time is the time corresponding to the moment when the probe is launched, and the second time is the time corresponding to when the probe hits the cornea. It can be understood that the first displacement is the displacement of the probe from the initial launch position to the corresponding displacement of the probe hitting the cornea.

[0125] Exemplarily, after obtaining the first measured voltage, the first displacement can be obtained by integrating the first measured voltage from the first time to the second time. In one example, the first corresponding relationship between the first measured voltage and time can be expressed by the following formula:

[0126]

[0127] Ф=k1*x (3)

[0128]

[0129] Wherein, formula (2) is Faraday's law of electromagnetic induction, formula (3) is the correspondence between magnetic flux and probe displacement, where k1 depends on the specific configuration of the magnetic field and the geometry of the measuring coil. Substituting formula (3) into formula (2) yields formula (1), and obtains the first correspondence between the first measured voltage and time. Wherein, E can be the electromotive force in the circuit, that is, the first measured voltage in the measuring coil; Ф can be the magnetic flux passing through the measuring coil; It can be the rate of change of magnetic flux with time. Further, it can be seen from the expression of formula (4) that the displacement χ of the probe can be calculated by integrating the time t, that is, integrating the lower limit of the first time and the upper limit of the second time.

[0130] S832. Determine a second corresponding relationship between energy W and displacement χ through a first corresponding relationship between the first measured voltage and time.

[0131] Exemplarily, the controller 130 may obtain the second corresponding relationship between energy and displacement through the first corresponding relationship and perform corresponding calculations on the first corresponding relationship.

[0132] In some optional embodiments, the fourth corresponding relationship between the driving force and the displacement can be determined by the first corresponding relationship between the first measured voltage and time and the force relationship of the probe. Further, the second corresponding relationship between the energy and the displacement can be determined by the fourth corresponding relationship between the driving force and the displacement.

[0133] For example, the force analysis of the probe can be performed to determine the magnitude of the resultant force of the probe at different positions of the driving coil, and obtain the corresponding relationship between the resultant force and the displacement of the probe. Further, the corresponding relationship between the driving force and the displacement of the probe is determined. It can be understood that the driving force on the probe is provided by the driving coil. In one example, Fig. 9 A schematic diagram showing a fourth corresponding relationship between the driving force and displacement of the probe provided by an embodiment of the present application is shown. Fig. 9 As shown in the fourth corresponding relationship, the horizontal axis represents the probe displacement x, and the vertical axis represents the driving force F. The origin is the initial position of the probe; the probe performs uniform acceleration motion in the interval from the origin to L1, and the probe performs variable deceleration motion in the interval from L1 to L1+L2; the probe performs uniform deceleration motion in the interval from L1+L2 to L1+L2+L3. It should be noted that please combine Figure 1 and Fig. 9 The probe moves with uniform acceleration within the L1 displacement, where L1 is equivalent to the distance between the first end 11 of the magnetic part of the probe and the first end 21 of the driving coil, that is, after the probe is launched from the initial position, it moves with uniform acceleration within the L1 displacement. After exceeding the proximal end of the driving coil 20, it is subjected to the reverse force of the driving coil 20 on the probe.

[0134] Exemplarily, the second corresponding relationship between energy and displacement can be determined by integrating the fourth corresponding relationship between the driving force and the displacement. In one example, the controller 130 can obtain a functional expression of the driving force and the displacement, that is, Fx, based on the first excitation voltage and the force expression of the probe, which is reflected as Fig. 9 The first displacement determined by the first correspondence is substituted into the Fx curve, and the probe energy value W at the moment of impact is obtained. When integrating, the acceleration and driving force are positive and negative, so the probe energy value W is the area above the x-axis minus the area below the x-axis. The corresponding relationship between the probe energy value W and the displacement x is as follows: Fig.10 As shown, Fig.10 A schematic diagram of a second corresponding relationship provided by an embodiment of the present application is shown, wherein Wexpection is the corresponding target energy value when the target parameter is an energy parameter, that is, the expected energy value at the moment of impact.

[0135] S833. According to the second corresponding relationship, determine that the energy value corresponding to the first distance is the actually measured energy value of the probe when it hits the cornea.

[0136] Exemplarily, the controller may be configured to be able to generate a second corresponding relationship between energy and displacement (e.g., Fig.10 ), determine that the energy value corresponding to the first distance is the energy value actually measured when the probe hits the cornea. Fig.10 As shown, the energy value corresponding to the displacement L1+L2+L3 is the measured energy value. Here, the probe hits the cornea, that is, the probe moves to the distance d0 between the initial position of the proximal end of the probe and the cornea.

[0137] In the embodiment of the present application, the controller can determine the first displacement of the probe movement by acquiring the first corresponding relationship between voltage and time, and determine the second corresponding relationship between energy and displacement according to the first corresponding relationship (such as Fig.10 ), thereby determining the measured energy value corresponding to the first displacement in the second corresponding relationship. Therefore, in the embodiment of the present application, the controller only needs to obtain the voltage value and time in the measuring coil to determine the energy value when the probe hits the cornea, and can obtain the energy value with less equipment, thereby reducing the cost of the tonometer.

[0138] In some optional embodiments, when the measured parameter is a speed parameter, step S830 may include the following steps:

[0139] S834. Integrate the first measurement voltage corresponding to the time period between the first time and the second time according to the first corresponding relationship to determine the first displacement of the probe.

[0140] The first displacement represents the distance the probe moves from the first time to the second time.

[0141] S835. Determine a second corresponding relationship between energy and displacement through a first corresponding relationship between the first measured voltage and time.

[0142] S836, through the second corresponding relationship between energy and displacement (such as Fig.10 As shown) and the kinetic energy theorem, the third corresponding relationship between velocity and displacement is determined (as shown Fig.11 shown).

[0143] S837. According to the third corresponding relationship, determine that the speed value corresponding to the first distance is the actual measured speed value of the probe when it hits the cornea.

[0144] Among them, steps S834-S837 are consistent with steps S831-S833, and will not be elaborated here.

[0145] Exemplarily, the controller may use a second correspondence between energy and displacement (such as Fig.10 As shown in Figure 2, the third correspondence between velocity and displacement is determined by the kinetic energy theorem. The correspondence between the probe velocity and displacement is shown in Figure 2. Fig.11 As shown, Fig.11 A schematic diagram of a third corresponding relationship provided by an embodiment of the present application is shown, wherein Vexpection is the corresponding target speed value when the target parameter is a speed parameter, that is, the impact speed expected to be carried by the probe at the moment of impacting the cornea.

[0146] Exemplarily, the controller may determine, based on the third correspondence between speed and displacement, that the speed value corresponding to the first distance is the actual speed value of the probe when it hits the cornea. Fig.10 As shown, the speed value corresponding to the displacement L1+L2+L3 is the first speed parameter.

[0147] In the embodiment of the present application, the controller can determine the first displacement of the probe movement by acquiring the first corresponding relationship between voltage and time, and determine the second corresponding relationship between energy and displacement according to the first corresponding relationship ( Fig.10 ), further, the third corresponding relationship is determined using the second corresponding relationship ( Fig.11 ), thereby determining the measured velocity value corresponding to the first displacement in the third corresponding relationship. Therefore, in the embodiment of the present application, the controller only needs to obtain the voltage value and time in the measuring coil to determine the velocity of the probe when it hits the cornea, and can obtain the velocity value with less equipment, thereby reducing the cost of the tonometer.

[0148] Furthermore, when the measured parameters are different, the process of determining the correction voltage is also different. Therefore, the following examples are combined to introduce the process of determining the correction voltage when the measured parameters are energy parameters and speed parameters.

[0149] In some optional embodiments, when the measured parameter is an energy parameter, step S840 may include the following steps:

[0150] S841. Calculate the energy difference between the measured energy value and the target energy value.

[0151] For example, the energy difference between the measured energy value and the target energy value may represent the energy difference between the energy of the probe when it actually hits the cornea and the energy set by the technician.

[0152] S842: Calculate the distance difference between the first displacement and the preset distance.

[0153] Exemplarily, the distance difference between the first displacement and the preset distance may represent the distance difference between the actual displacement of the probe and the probe displacement preset by the technician.

[0154] S843. Calculate the corrected driving force based on the distance difference and the energy difference.

[0155] For example, it can be understood that the distance difference is actually the distance difference generated by the probe during the uniform deceleration movement, so the driving force of the probe during the uniform deceleration movement is determined according to the formula of force and displacement. Fig. 9 The distance difference is actually the distance difference generated by the probe during the uniform deceleration movement. Figure 1 It can be understood that the probe 10 is in the initial position, and the distance between the proximal end of the metal part of the probe (including the part wrapped by the plastic part) and the proximal end of the driving coil is L1. After the probe is ejected, since L1 and even the entire first displacement are smaller than the overall size of the probe, it can be considered that the friction force on the probe during the entire movement process is a constant. According to the force analysis formula (5) of the probe:

[0156] F 合力 =F 驱动 -f 阻力 (5)

[0157] In the process of moving forward a distance of L1 from the initial position, the driving force of the driving coil 20 applied to the probe 10 is approximately constant in calculation. Therefore, the resultant force applied does not change, and the probe undergoes a uniformly accelerated charging process until the metal of the metal part of the probe is flush with the proximal end of the driving coil, and the displacement of the probe is L1. For example, L1 can be 2mm. During the uniform acceleration process, the initial energy given to the probe is only related to the acceleration and driving force brought by the driving voltage or driving power of the driving coil. Among them, Fig. 9 Fmax is the preset maximum value allowed; Fmin is the preset minimum value allowed; Fdefault is the driving force corresponding to the first driving voltage, which can be set according to the experience value or adjusted by the user according to the user's body feeling, and can also be understood as the driving force corresponding to the first driving voltage pre-applied by the probe. It can be understood that the length of L1 is only related to the structure of the tonometer itself.

[0158] When the probe displacement exceeds L1, that is, when the probe moves between L1 and L1+L2, the metal part of the probe exceeds the proximal end of the drive coil, so the acceleration drops rapidly and the probe begins to decelerate. This stage has nothing to do with the impact, but only with the structure of the tonometer itself (such as the length of the drive coil, friction, and finish), which is approximately considered to be unchanged.

[0159] When the probe displacement exceeds L1+L2, the probe begins to move in a uniformly decelerated motion under the action of constant resistance until it hits the cornea of ​​the object to be measured. Therefore, it can be understood that since L1 and L2 are both constant values, the distance difference is actually the distance difference generated by the probe in the uniformly decelerated motion process, that is, L3.

[0160] S844. Determine the correction voltage corresponding to the correction driving force using the magnetic energy formula.

[0161] Exemplarily, the expression of the magnetic energy formula can be expressed by the following formula (6):

[0162]

[0163] Where F represents the driving force on the probe, R m represents magnetic resistance; χ represents the displacement of the probe; N represents the number of coil turns; g represents the air gap; μ0 represents the air permeability, where μ0 can be 1; d m represents the probe diameter; l s represents the probe length; V represents the voltage; k represents a constant coefficient.

[0164] Exemplarily, the correction voltage can be calculated by the above formula (6).

[0165] In the embodiment of the present application, the calculation of the correction voltage can be achieved by determining the energy difference between the measured energy value and the target energy value.

[0166] Further, in some optional embodiments, when the measured parameter is a speed parameter, S840 in the embodiment of the present application may include the following steps:

[0167] S845: Calculate the speed difference between the actual speed value and the target speed value.

[0168] S846. Calculate the corrected energy based on the speed difference.

[0169] S847: Calculate the distance difference between the first displacement and the preset distance.

[0170] S848. Calculate the corrected driving force using the distance difference and the corrected energy.

[0171] S849. Determine the correction voltage corresponding to the correction driving force through the magnetic energy formula.

[0172] Exemplarily, the speed difference between the first speed parameter and the target speed parameter can be calculated, and then the correction energy can be calculated according to the kinetic energy theorem. After determining the correction energy, the correction driving force can be calculated according to the correction energy and the first displacement, and further, the correction voltage corresponding to the correction driving force can be determined using the magnetic energy formula. The calculation process of the correction driving force and the calculation process of the correction voltage will not be repeated here.

[0173] In the embodiment of the present application, the calculation of the correction voltage can be achieved by determining the speed difference between the first speed parameter and the target speed parameter.

[0174] In order to improve the accuracy of intraocular pressure measurement, the probe can be launched at the same initial position. Therefore, before launching the probe according to the first excitation voltage, the measuring coil 30 is controlled by the controller 130 to pull the probe 10 back to the initial position. As another implementation of the present application, the present application also provides another implementation of intraocular pressure measurement, which is specifically referred to in the following embodiments.

[0175] In some optional embodiments, before the power regulation module outputs the first excitation voltage to the drive coil to cause the probe to be launched along the extending direction of the probe, the intraocular pressure testing method in the embodiment of the present application further includes the following steps:

[0176] S870, outputting a second excitation voltage to the measuring coil through the controller, so that the probe is pulled back to the initial position along the extending direction of the probe.

[0177] Exemplarily, the controller may output a second excitation voltage to the measuring coil so that the probe is pulled back to the initial position along the extending direction of the probe. The second excitation voltage may be a relatively large excitation voltage, and a fixed structure may exist in the tonometer, and the probe may be fixed in the initial position after being pulled to the initial position.

[0178] For example, Figure 3 For example, the controller 130 can control the measuring coil 30 by controlling the second switch device Q2. In one example, the second switch device Q2 is a PMOS, and the gate of the second switch device Q2 is connected to the controller 130, the drain is connected to the driving voltage VCC, and the source is connected to the driving coil 20. When the controller 130 outputs a low level to the gate of the second switch device Q2, the PMOS tube is turned on, and the voltage of the driving voltage VCC can flow to the measuring coil 30, and the measuring coil 30 can realize its pull-back function; when the controller 130 outputs a high level to the gate of the second switch device Q2, the PMOS tube is turned off, and the voltage of the driving voltage VCC cannot flow into the measuring coil 30, and the measuring coil 30 does not work.

[0179] In an embodiment of the present application, the probe is pulled back to the initial position before being launched according to the first excitation voltage, thereby ensuring that the probe can accelerate over the same distance, thereby ensuring that the probe can obtain the same initial parameter values, including speed parameters and energy parameters, thereby improving the accuracy of intraocular pressure measurement.

[0180] Aspects of the present disclosure are described above with reference to the flowchart and / or block diagram of the tonometer and intraocular pressure measurement method according to the embodiment of the present disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box in the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It can also be understood that each box in the block diagram and / or flowchart and the combination of boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0181] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. A rebound tonometer, characterized in that: include: A tonometer body, the tonometer body comprising a probe, a driving coil and a measuring coil, wherein the driving coil and the measuring coil partially surround the probe, the driving coil is used to drive the probe to emit and generate displacement along the extending direction of the probe, and the measuring coil is used to detect the motion state of the probe; A power regulation module, the power regulation module is electrically connected to the controller and the drive coil respectively; The controller is electrically connected to the measuring coil and is used to perform the following operations: The power regulating module regulates the first excitation voltage input to the driving coil, so that the probe is driven by the first excitation voltage to emit along the extending direction of the probe; In the process of the probe rebounding in the reverse direction after striking the cornea, obtaining a first corresponding relationship between a first measurement voltage in the measurement coil and time; Determining, by the controller, the actual measured parameter value of the probe at the moment of impacting the cornea using the first corresponding relationship; When the difference between the measured parameter value and the target parameter value is greater than a preset threshold, calculating a correction voltage using the difference; Correcting the first excitation voltage according to the correction voltage to obtain a target excitation voltage; When the difference between the measured parameter value and the target parameter value is less than or equal to a preset threshold, determining the first excitation voltage as a target excitation voltage; The intraocular pressure of the object to be measured is measured according to the target excitation voltage to obtain a final measurement result of the same measurement cycle.

2. The rebound tonometer according to claim 1, characterized in that: Also includes: A voltage conversion device, comprising a power input terminal, a first input terminal, a first output terminal and a feedback terminal; A first voltage regulating module, wherein the first voltage regulating module is connected between the first output terminal and the feedback terminal; A filter module, one end of which is connected to the first output end, and the other end of which is connected to the driving coil; Wherein, the first end of the power regulating module is connected to the controller, and the second end of the power regulating module is connected to the first voltage regulating module; A power supply is connected to the power input terminal of the voltage conversion device and the controller respectively.

3. The rebound tonometer according to claim 2, characterized in that: It also includes a first switch device and a second switch device, wherein the first switch device is located between the filter module and the drive coil and is connected to the controller; the second switch device is located between the filter module and the measurement coil and is connected to the controller.

4. The rebound tonometer according to claim 3, characterized in that: It also includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first voltage-dividing resistor is connected between the first switch device and the driving coil, and the second voltage-dividing resistor is connected between the second switch device and the measuring coil.

5. The rebound tonometer according to any one of claims 1 to 4, characterized in that: The power regulation module comprises: A second voltage regulating module, wherein a first end of the second voltage regulating module is connected to the controller, and a second end of the second voltage regulating module is connected to the first voltage regulating module; or A second excitation voltage input module, wherein a first end of the second excitation voltage input module is connected to the controller, and a second end of the second excitation voltage input module is connected to the first voltage regulating module.

6. The rebound tonometer according to claim 5, characterized in that: The second voltage regulating module includes at least one of the following: A variable resistor, wherein a control end of the variable resistor is connected to the controller, a first end of the variable resistor is connected to the first voltage regulating module, and a second end is grounded; or, A plurality of series resistors are connected to the first voltage regulating module, and each resistor is connected to a controller via a switch device to control whether the corresponding resistor is connected to the second voltage regulating module.

7. A method for measuring intraocular pressure, characterized in that: The rebound tonometer according to any one of claims 1 to 6 is applied, and the method comprises: The power regulating module regulates the first excitation voltage input to the driving coil, so that the probe is driven by the first excitation voltage to emit along the extending direction of the probe; In the process of the probe rebounding in the reverse direction after hitting the cornea, a first corresponding relationship between a first measurement voltage in the measurement coil and time is acquired through a controller; Determining the measured parameter value of the probe at the moment of impacting the cornea through the first corresponding relationship; When the difference between the measured parameter value and the target parameter value is greater than a preset threshold, calculating a correction voltage using the difference; Correcting the first excitation voltage according to the correction voltage to obtain a target excitation voltage; When the difference between the measured parameter value and the target parameter value is less than or equal to a preset threshold, determining the first excitation voltage as a target excitation voltage; The intraocular pressure of the object to be measured is measured according to the target excitation voltage to obtain a final measurement result of the same measurement cycle.

8. The method according to claim 7, characterized in that The step of measuring the intraocular pressure of the subject to be measured according to the target excitation voltage to obtain a final measurement result of the same measurement cycle includes: The power regulating module adjusts the voltage input to the driving coil to the target excitation voltage; Exciting the driving coil according to the target excitation voltage so that the probe is emitted along the extending direction of the probe; In the process of the probe rebounding in the reverse direction after hitting the cornea, a target corresponding relationship between a second measurement voltage in the measurement coil and time is obtained through a controller; Calculating the energy value of the probe at the moment of impacting the cornea according to the target correspondence relationship; Using the energy value at the moment of impact, the intraocular pressure of the object to be measured is calculated to obtain a single measurement result; Determine whether N measurements in the same measurement cycle are completed. If so, calculate the final measurement result based on the N single measurement results in the same measurement cycle; if not, return to stimulating the drive coil according to the target excitation voltage until the N measurements in the same measurement cycle are completed; N is an integer.

9. The method according to claim 8, characterized in that Before exciting the driving coil according to the target excitation voltage so that the probe is launched along the extending direction of the probe, the method further includes: When it is determined that the first excitation voltage is the target excitation voltage, the intraocular pressure of the object to be measured is calculated using the measured parameter value to obtain a single intraocular pressure measurement result, and the measurement result is recorded as the first single measurement result in the same measurement cycle.

10. The method according to claim 7, characterized in that The measured parameter value includes a measured energy value corresponding to the energy parameter, and the target parameter value includes a target energy value corresponding to the energy parameter; The first excitation voltage indicates that the driving coil launches the probe at a first time under the excitation of the first excitation voltage, and the probe passes a preset distance and strikes the cornea at a target energy value at a second time; Determining the measured parameter value of the probe at the moment of impacting the cornea through the first corresponding relationship includes: Integrating the first measurement voltage corresponding to the first time to the second time through the first corresponding relationship to determine the first displacement of the probe, where the first displacement represents the distance moved by the probe from the first time to the second time; Determining a second corresponding relationship between energy and displacement through a first corresponding relationship between the first measured voltage and time; According to the second corresponding relationship, it is determined that the energy value corresponding to the first distance is the actually measured energy value of the probe when it hits the cornea.

11. The method according to claim 7, characterized in that The measured parameter value includes a measured speed value corresponding to the speed parameter, and the target parameter value includes a target speed value corresponding to the speed parameter, and the target parameter value is related to the human-machine distance and corneal sensitivity; The first excitation voltage indicates that the drive coil is emitted at a first time under the excitation of the first excitation voltage, and the probe passes a preset distance and hits the cornea at a target speed value within a second time; Determining the measured parameter value of the probe at the moment of impacting the cornea through the first corresponding relationship includes: Integrate the first measurement voltage corresponding to the time period between the first time and the second time according to the first corresponding relationship to determine the first displacement of the probe, where the first displacement represents the distance moved by the probe from the first time to the second time; Determining a second corresponding relationship between energy and displacement through a first corresponding relationship between the first measured voltage and time; Determine the third corresponding relationship between velocity and displacement through the second corresponding relationship between energy and displacement and the kinetic energy theorem; According to the third corresponding relationship, it is determined that the speed value corresponding to the first distance is the actual measured speed value of the probe when it hits the cornea.

12. The method according to claim 10 or 11, characterized in that: The determining a second corresponding relationship between energy and displacement by using a first corresponding relationship between the first measured voltage and time includes: Determining a fourth corresponding relationship between driving force and displacement through a first corresponding relationship between the first measured voltage and time and a force relationship of the probe; The second corresponding relationship between energy and displacement is determined through the fourth corresponding relationship between the driving force and the displacement.

13. The method according to claim 7 or 10, characterized in that: When the difference between the measured parameter value and the target parameter value is greater than a preset threshold, calculating the correction voltage using the difference includes: Calculating the energy difference between the measured energy value and the target energy value; Calculating a distance difference between the first displacement and a preset distance; Calculating a corrected driving force through the distance difference and the energy difference; The correction voltage corresponding to the correction driving force is determined by using the magnetic energy formula.

14. The method according to any one of claims 7 or 11, characterized in that: When the difference between the measured parameter value and the target parameter value is greater than a preset threshold, calculating the correction voltage using the difference includes: Calculating a speed difference between the measured speed value and the target speed value; Calculating the corrected energy through the speed difference; Calculating a distance difference between the first displacement and a preset distance; Calculating a corrected driving force using the distance difference and the corrected energy; The correction voltage corresponding to the correction driving force is determined by the magnetic energy formula.

15. The method according to any one of claims 7 to 14, characterized in that: Before adjusting the first excitation voltage input to the driving coil by the power adjustment module so that the probe is driven by the first excitation voltage to be emitted along the extending direction of the probe, the method includes: A second excitation voltage is output to the measuring coil through the controller, so that the probe is pulled back to an initial position along the extending direction of the probe.

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