29 results about "Applanation tonometer" patented technology

Disclosed is a tonometer (100) for measuring intraocular pressure of an eye (150), the tonometer comprising: an air pulse generator (102); a corneal oscillation measurement sensor (104), and a controller (106) communicably coupled to air pulse generator and corneal oscillation measurement sensor, wherein the controller is configured to: control the air pulse generator to provide an excitation air pulse (108) towards a cornea (152) of the eye during a first time period (T1), wherein provided excitation air pulse has a first intensity (I) at an end time (T1e) of first time period, and this intensity is reduced from first intensity to a second intensity during a second time period (T2), wherein the second time period is after first time period, for producing corneal oscillations (320, 330); measure a signal related to corneal oscillations, using corneal oscillation measurement sensor; and determine intraocular pressure from measured signal.

The utility model relates to the technical field of tonometer, in particular to a multi-gear gas injection device for a non-contact tonometer, which mainly solves the technical problem that the existing non-contact tonometer has fewer gears for measuring results. The first support and the second support are fixed to the bottom plate, the cylinder body is fixed to the top end of the first support, the piston is connected into the cylinder body, the electric telescopic push rod is fixed to the top end of the second support and connected with the piston, and the rotating speed adjusting piece is connected with the electric telescopic push rod. According to the gas injection device, the rotation speed of the motor of the electric telescopic push rod is adjusted through the rotation speed adjusting piece to achieve gear adjustment of injection gas pressure, three or more gears can be designed more easily, and the requirements of different patients can be met.

The utility model belongs to the technical field of protective eyeshades, and particularly relates to a supporting eyeshade for an I-CARE tonometer, which comprises a protective eye frame, the outer side of the protective eye frame is in contact with the inner side of the I-CARE tonometer, and the protective eye frame is used for fixing the position of the I-CARE tonometer; the telescopic steering mechanism is arranged on the side, close to the eyes of the patient, of the protective eye frame and used for adjusting the distance and angle between the arc-shaped abutting head and the patient, and the arc-shaped abutting head is arranged on the side, close to the eyes of the patient, of the telescopic steering mechanism and used for making contact with the skin of the patient so as to fix the position of the protective eye frame. Different from a traditional method depending on a single fixing point, the I-CARE tonometer multi-point supporting and fixing device has the advantages that multi-point supporting and fixing of the I-CARE tonometer are achieved, the use stability of the device is remarkably enhanced, and the continuity and stability of measurement can be ensured even if a patient slightly moves.

A method for calibrating and identifying a tonometer probe includes the steps of: a) generating an initial magnetic impulse upon a probe of ferromagnetic material via a first electromagnetic coil using known impulse parameters, b) generating a magnetic impulse via an electromagnetic coil to reverse probe velocity, c) repeating steps a)-b) for N cycles, d) measuring a resultant-induced voltage upon a measuring electromagnetic coil from probe motion, e) comparing the resultant-induced voltage upon the measuring electromagnetic coil to a reference value, and f) rejecting the probe if the induced voltage measured by the measuring electromagnetic coil is different than the reference value after N cycles.

Disclosed is a method of measuring intraocular pressure value of eye (308), the method comprising steps of: sending first excitation air pulse having first parameter values towards eye; measuring first signal related to corneal oscillations caused by sent first excitation air pulse; determining signal quality indicator of first signal; adjusting first parameter values to second parameter values if, determined signal quality indicator is outside of predetermined range; sending second excitation air pulse having second parameter values towards eye; measuring second signal related to corneal oscillations caused by sent second excitation air pulse; and determining intraocular pressure value from measured second signal. Disclosed also is a tonometer (200, 300) for measuring intraocular pressure of an eye, wherein the tonometer comprises an air pulse generator (202, 400), a corneal oscillation measurement sensor (204), and a controller (206).

Provided is a piston unit (1) for a non-contact tonometer for measuring intraocular pressure of an eye to be examined, the non-contact tonometer having the piston unit (1), the piston unit (1) including: a cylinder (42) that discharges a fluid to a nozzle by an internal piston (44), the nozzle blowing the fluid against a cornea of the eye to be examined; a solenoid (45) having a rotating arm portion (45a); a link joint (48) connecting a first portion (45b) of the arm portion (45a) and the piston (44); and a stopper member (49) blocking a second portion (45c) of the rotating arm portion (45a).

Disclosed is a tonometer (100, 200, 300) for measuring intraocular pressure of an eye (108, 208, 302), the tonometer comprising an air pulse generator (102, 202) having an air exit element (104, 204); a displacement sensor (106, 310) for measuring deformations of the eye, wherein the displacement sensor has a principal axis (112, 212) of measurement, and wherein an exit interface (114, 214) of the air exit element is arranged along the principal axis of measurement; and a controller (110, 210) communicably coupled to the air pulse generator and the displacement sensor. The controller is configured to control the air pulse generator to generate an excitation air pulse (116, 236, 304) and control the air pulse generator to send the excitation air pulse towards the eye via the exit interface of air exit element, for producing deformations; measure a signal (308) related to the deformations, using displacement sensor; and determine intraocular pressure of the eye from the measured signal.

This invention relates to a spring-loaded tonometer. The spring-loaded tonometer includes a housing, an internal mounting base, and a probe mounted on one side of the mounting base. The probe includes a mounting shell fixedly connected to the inside of the mounting base. An outer cylinder is located inside the mounting shell, and an inner cylinder is located inside the outer cylinder. A guide is located inside the inner cylinder, and a tail-end limiting member is located inside the mounting shell. The guide includes a probe rod slidably connected inside the inner cylinder. Multiple guide magnetic strips are fixedly mounted on the outer side of the probe rod. A radial permanent magnet is fixedly connected inside the inner cylinder, and a magnetically levitated guide rail is fixedly mounted inside the radial permanent magnet. This invention achieves the beneficial effects of high probe mounting coaxiality, no radial offset in the movement trajectory, and long-term stable measurement accuracy. This structure solves the accuracy drift problem caused by wear of traditional guide rails, improving the repeatability of measurement results and the service life of the equipment.

The application belongs to the technical field of micro electro mechanical system, and particularly relates to a non-contact intraocular pressure visual calibration method, which is simplified by means of an AI model of human eyes and an intraocular pressure deformation variable detection device, combined with MEMS technology and visual analysis theory, and realizes accurate monitoring of corneal deformation by real-time and dynamic simulation of human eye pressure, data collection by optical or image sensors, provides a more accurate intraocular pressure evaluation method, and realizes effective verification of a non-contact tonometer. Compared with the prior art, the application has the beneficial effects that: the application can realize accurate monitoring of corneal deformation by means of optical or image sensors for data collection, can realize accurate monitoring of human corneal pressure by integrating corneal deformation variable calculation and analysis algorithms in MEMS sensors through integrated technology, and can realize dynamic monitoring.

An ultrasonic tonometer for measuring intraocular pressure of a subject eye by using an ultrasonic wave. The ultrasonic tonometer includes an irradiation unit configured to irradiate the subject eye with a focused ultrasonic wave, and a Z-alignment detection unit configured to detect an alignment state in a working distance direction with respect to the subject eye. An appropriate Z-alignment position is set to a position that is farther from the irradiation unit than is a geometric focal position of the irradiation unit. The appropriate Z-alignment position is detected by the Z-alignment detection unit.

Disclosed is tonometer (100) for measuring intraocular pressure of eye (102), tonometer comprising: air pulse generator (104); displacement sensor (106); controller (108) coupled to air pulse generator and displacement sensor, wherein controller is configured to: control air pulse generator to generate excitation air pulse (110) and send excitation air pulse towards eye in first time period lying in range of 1 millisecond -15 milliseconds; control displacement sensor to measure signal related to deformation of cornea produced by excitation air pulse during first time period to form corneal displacement profile; determine, from the corneal displacement profile, the intraocular pressure of the eye.

Disclosed is a tabletop tonometer apparatus that includes an encasement within which a motor controlled applanation tonometer is housed to indicate the intraocular pressure (IOP) of an eye undergoing testing. The tonometer encasement has a head positioning stand on which the head of an individual is positioned to enable the individual's eye to be tested for IOP. A 3-axis (X, Y, Z) tonometer position controller is housed within the tonometer encasement at which to be coupled to the applanation tonometer. The tonometer position controller has three reversible linear motors to generate driving forces for causing tonometer positioning slides interconnected with the applanation tonometer to move in any one or more of three orthogonally aligned directions so that the tonometer moves outwardly from the encasement towards and into contact with the eye of the individual.

The invention relates to the technical field of tonometer, in particular to a real-time dynamic tonometer which comprises a signal acquisition module, a signal processing module, an algorithm model module and a display module, the signal acquisition module is in wireless communication with the signal processing module through Bluetooth, and the display module is used for displaying real-time intraocular pressure signal data. The signal acquisition module comprises a plurality of flexible patches. According to the device, the three-axis acceleration sensor and the surface myoelectricity sensor are arranged through the flexible patch, eyelid tremor signals are detected through the three-axis acceleration sensor and the surface myoelectricity sensor, the tremor signals are processed through the signal processing module, the intraocular pressure value is calculated through the algorithm model module, measurement can be carried out without contact with the eye mask, and the measurement accuracy is improved. Meanwhile, the influence of the biomechanical characteristics of the cornea is avoided, the device is suitable for being used by a part of patients with cornea diseases, and a user can wear the device by himself / herself for measurement.

A non-contact tonometer (100, 200, 302, 502) is disclosed. The invention relates to a non-contact tonometer comprising an excitation and measurement unit (102, 202, 300, 504) comprising an electromagnetic exciter (104, 204, 306, 400, 506) comprising: at least one electrical coil (106, 206, 304, 404, 508) powered with a variable current (i) and arranged to generate a variable magnetic field (416, 500); at least one magnetic armature (108, 208, 210, 212, 510) arranged to direct a variable magnetic field toward the eye (110, 214, 303, 418, 512) to at least partially pass through the cornea (112, 216, 301, 402) of the eye. The invention discloses a method for measuring an intraocular pressure value.

The application relates to the technical field of tonometers and tonometer measurement methods, and relates to a tonometer which comprises a shell, a contact piece, a driving unit, a sensor, a driving control unit, a display unit, a power unit and a supporting unit for contacting the user's glabella and malar bone. The tonometer is provided with a sensor for sensing the pressure value of the contact piece, the rotation of a stepping motor is controlled according to the pressure value of the contact piece, the contact piece is slowly contacted with the eyelid, and the intraocular pressure of the user is detected. When the contact piece contacts the eyelid of the user, the sensor senses the contact, a program controls the contact piece to apply force to the eyeball according to the sensing data, the elastic reaction information of the eyeball is sensed, pressure data is collected, and the intraocular pressure value is obtained through data processing.

A headrest for ophthalmic instruments facilitates precise positioning of the instrument relative to the test subject's eye without requiring the removal of the headrest's contact elements from contact with the test subject's face. The ophthalmic instrument may be, for example, a spring-loaded tonometer or a non-contact tonometer. The headrest includes a hollow spherical contact element formed from an elastically deformable material, such as thermoplastic elastomer (TPE) or silicone rubber. When the contact element is not deformed, its outer surface can have a spherical or near-spherical shape.

The present application relates to the technical field of tonometer, in particular to a real-time dynamic tonometer, comprising a signal acquisition module, a signal processing module, an algorithm model module and a display module, the signal acquisition module and the signal processing module are in wireless communication through Bluetooth, the display module is used for displaying real-time intraocular pressure signal data, and the signal acquisition module comprises a plurality of flexible patches.In the present application, the flexible patch is provided with a three-axis acceleration sensor and a surface electromyography sensor, the three-axis acceleration sensor and the surface electromyography sensor are used for detecting eyelid tremor signals, the signal processing module is used for processing the tremor signals, the algorithm model module is used for calculating the intraocular pressure value, the measurement can be realized without contacting the eye membrane, the discomfort during measurement can be reduced, the tonometer is not affected by the corneal biomechanical characteristics, is suitable for patients with corneal diseases, and the user can perform measurement by himself.

An object of the present application is to provide an ultrasonic tonometer capable of appropriately irradiating ultrasonic waves to an eye to be examined. An ultrasonic tonometer measures intraocular pressure of an eye to be examined using ultrasonic waves, and includes an ultrasonic wave irradiator that irradiates ultrasonic waves to the eye to be examined, and a control unit that applies a signal subjected to amplitude modulation to the ultrasonic wave irradiator. In addition, an ultrasonic tonometer measures intraocular pressure of an eye to be examined using ultrasonic waves, and includes an ultrasonic wave irradiator that has a Langevin vibrator provided with an opening portion and irradiates ultrasonic waves to the eye to be examined, a deformation detection unit that detects a deformation state of the cornea, and a control unit that calculates hysteresis of the cornea based on the deformation state of the cornea acquired by the deformation detection unit.

The invention relates to the technical field of precision machinery and micro-electro-mechanical integration, in particular to an automatic intraocular pressure measuring system and a using method thereof.The automatic intraocular pressure measuring system comprises a control unit, an X-axis moving sliding table, a Y-axis moving sliding table, a Z-axis moving sliding table, a probe and camera fixing module, an X-axis moving sliding table, a Y-axis moving sliding table and a Z-axis moving sliding table; the three parts form a three-degree-of-freedom precise alignment platform of a Cartesian coordinate system; the probe and camera fixing module is fixed at the tail end of the X-axis moving sliding table; the control unit is used for processing the image data acquired by the camera and controlling the cooperative displacement of the three movable sliding tables; the system drives the three movable sliding tables to achieve three-dimensional automatic positioning of the probe to the eyeball through target position information fed back by the camera in real time, subjective errors and jitter deviation caused by manual operation are effectively eliminated, it is ensured that the probe of the tonometer is accurately aligned with the measured eye position, and the accuracy and repeatability of intraocular pressure measurement data are remarkably improved.

An ultrasonic tonometer includes an ultrasonic actuator having an ultrasonic element and configured to irradiate the subject eye with ultrasound generated by the ultrasonic element. The ultrasonic actuator includes: a sonotrode propagating ultrasound generated by the ultrasonic element into air; a flexural vibration portion disposed on a distal side of the sonotrode in an axial direction of the ultrasonic actuator; and a reflecting portion covering, with a gap with the flexural vibration portion, at least a part of the flexural vibration portion in a circumferential direction.

Intraocular pressure (IOP) tonometers, systems including IOP tonometers, methods of fabricating IOP tonometers, and methods for using systems to monitor IOP in a subject. The IOP tonometers include a contact lens configured to be located and retained on a user's eye, and a corneal sensor having a circular trace located proximate an outer peripheral edge of the contact lens so as to leave an unobstructed area at a center region of the contact lens. The corneal sensor produces a detectable shift in resonance frequency in response to a change in IOP of the user's eye, which is wirelessly delectable by a receiving antenna. The IOP tonometer is fabricated by depositing one or more layers of the circular trace onto a temporary substrate and then transferring the circular trace onto the outer surface of the contact lens.

Disclosed is a tonometer (100, 200) for measuring an intraocular pressure value of an eye (104, 204). The tonometer comprising a a sensor setup an air pulse generator (110); a controller (112) communicatively coupled to the first sensor, the second sensor and the air pulse generator. The controller is configured to: measure a distance between the eye and the tonometer with the sensor setup; determine a first set of operational parameters of the air pulse generator based on the distance; control the air pulse generator to send a first excitation air pulse (114, 202) towards the eye; measure a first signal (206) related to corneal oscillations caused by the sent first excitation air pulse, with the sensor setup; and determine the intraocular pressure value from the measured first signal. Disclosed is a method for measuring the intraocular pressure value of the eye using the tonometer.

To provide a non-contact type tonometer capable of sucking a fluid at satisfactory timing, and a tonometer control program.SOLUTION: A non-contact type tonometer which measures the intraocular pressure of a subject eye without contact comprises: fluid discharge means which discharges a fluid to the cornea of the subject eye; drive means which drives the fluid discharge means; and control means which controls the drive means. The control means changes timing of starting a fluid sucking operation after the fluid discharge.SELECTED DRAWING: Figure 5

The invention relates to the technical field of medical instruments, in particular to a sensor support and an intraocular pressure measurement drainage device.The sensor support comprises a support body, a sensor mounting structure and a drainage device mounting structure, and the sensor mounting structure and the drainage device mounting structure are arranged on the support body; the support body is of a plate-shaped structure. The intratonometer and an MIGS instrument are integrated, the core is to break through a'treatment-monitoring 'closed loop of glaucoma, and the clinical pain point that postoperative intraocular pressure fluctuation cannot be perceived in real time and the reexamination compliance of a patient is low is solved; compared with an independent MIGS instrument in the market, the integrated equipment continuously monitors intraocular pressure and wirelessly transmits data through the implantable sensor, so that a doctor can accurately evaluate an MIGS postoperative effect, find an intraocular pressure peak value or instrument failure in an early stage, formulate a personalized treatment scheme, avoid optic nerve injury, reduce the burden of a patient frequently going to a hospital for reexamination, and improve the patient experience. The crossing from a single operation to long-term chronic disease digital management is realized, and the curative effect and the life quality of a patient are remarkably improved.

Disclosed is a tonometer (100) for measuring an intraocular pressure of an eye (102), the tonometer comprising: an air pulse generator; a corneal oscillation measurement sensor (106); a controller (108) coupled to the air pulse generator (104) and the corneal oscillation measurement sensor, wherein the controller is configured to: control the air pulse generator to generate an excitation air pulse (116) and send the excitation air pulse towards the eye at a velocity lying in a range of 15- 130 metres per second; control the corneal oscillation measurement sensor (106) to measure a signal related to corneal oscillations caused by incidence of the excitation air pulse on the eye; and determine the intraocular pressure from the measured signal.

Disclosed is a dual measurement tonometer (100, 200) for measuring intraocular pressure (IOP) values of a first eye (122A, 204) and a second eye (122B) of a user (120) within a pre-defined time period. The dual measurement tonometer comprises a first air pulse generator (APG) (102A) and a second APG (102B) aligned with the first and second eye, respectively, the first and second APGs positioned on opposite sides of a frame (104); at least one corneal oscillation measurement sensor (106, 208) (COMS) operatively coupled to the first and second APGs; a controller (108) communicatively coupled to the COMS and the first and second APGs. The controller is configured to: determine first set of operational parameters of each of the first and second APGs; control the first and second APGs to send, within a pre-defined time period, a first excitation air pulse (126, 202) towards the eyes; measure, within the pre-defined time period, a first signal (206) related to corneal oscillations of the eyes, caused by the first excitation air pulse, using the COMS; determine the IOP values from the measured first signals.