44 results about "Applanation tonometer" patented technology

Apparatus include a particle array configured to propagate an incident solitary wave to an eye, a housing configured to support the particle array, and a sensor coupled to the particle array and configured to detect a return solitary wave propagating along the particle array from the eye. Methods include directing an incident solitary wave along a solitary wave particle array coupled to an eye and detecting a return solitary wave propagating along the solitary wave particle array from the eye. Methods also include estimating intraocular pressure for the eye by comparing solitary wave data to a relationship between a time of return solitary wave time of flight and an intraocular pressure.

Obtaining corneal measurements for non-contact tonometry. Systems, devices, and methods for determining intraocular pressure (IOP) of an eye are provided. The system may include a pump configured to generate an air puff and a nozzle configured to direct the air puff along a first axis toward the eye. The system may further include a light source distal to the nozzle and oriented to emit a light beam along a second axis transverse to the first axis toward a first linear optical sensor. A first portion of the light beam illuminates an outer surface of the eye, and a second portion of the light beam passes through a front surface of the eye. The system may further include a first linear optical sensor positioned distal to the nozzle and configured to receive the second portion of the light beam.

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.

To provide a non-contact tonometer which can reduce a capacity of capacitor, power capacity and size of a power source.SOLUTION: A tonometer includes: an electric actuator (solenoid 34g) that compresses the air inside a cylinder 34d by a piston 34f; a nozzle 21b communicating with an inside of the cylinder and blowing an air compressed by the piston onto a subject eye; a capacitor 46 for discharging the electric charge accumulated by charging and supply a first drive current (drive current I2) to the electric actuator; and a power source 42 which can execute a charging of the capacitor and a supply of second drive current (drive current I1) to the electric actuator. The electric actuator operates upon receiving a supply of the first drive current from the capacitor and a supply of the second drive current from the power source.SELECTED DRAWING: Figure 4

Systems, methods, and devices for disinfecting tonometer probes are described. One example provides a specialized container that allows easy catching of a used probe without having to touch the probe, allows for the storage of multiple used probes, allows for simple disinfection of the probes without having to handle the probes or remove them from the container, allows for rinsing of the probes and container without handling the probes, and then allows for the simple insertion of the disinfected probes directly from the container without having to touch the probes or reinsert them into their specialized tubes.

The invention relates to the technical field of tonometer, and discloses a non-contact tonometer capable of intelligently adjusting air injection force, which comprises a cavity, and the bottom of the cavity is communicated with an electromagnetic cylinder. Accurate positioning of the vertex of the cornea of the eye is achieved through the positioning camera. Once positioning is completed, the system activates the electromagnetic air cylinder to generate precisely controlled airflow. The airflow is guided to the surface of the eye, appropriate pressure is applied to cause the ocular surface to deform to a certain degree, meanwhile, the infrared measuring lamp emits infrared light rays to the ocular surface, and the light rays are captured by the signal receiver after being reflected by the ocular surface. The reflected light signal changes along with the deformation of the ocular surface due to the airflow effect. The signal receiver monitors and records the changes in real time, an electric signal curve representing dynamic changes of the ocular surface is generated and efficiently displayed through the display screen, and the system can calculate an accurate intraocular pressure value by analyzing the relation between the electric signal curve and different applied air pressures.

Apparatus and methods are described including at least one light source (22) configured to direct light toward an eye of a patient. Two or more cameras (28) detect light from the light source that is reflected from a surface (24) of the patient's eye (26). A computer processor (30) receives data from the two or more cameras (28), derives the curvature of the surface (24) of the patient's eye (26) from the received data, and derives intraocular pressure of the patient's eye (26) and / or a change in intraocular pressure of the patient's eye (26) from the derived curvature. Other applications are also described.

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 invention provides an automatic probe replacing device for a springback type tonometer and a filling method, and belongs to the technical field of ophthalmology medical instruments. The device comprises a probe blister packaging plate on which a plurality of probes are stored; the automatic probe feeding device is used for tearing the probe blister packaging plate and exposing the probes, so that the probes are orderly, quantitatively and automatically conveyed; the magnetic attraction device is used for attracting the exposed probe; the probe warped end restraining structure is arranged below the magnetic attraction device and used for enabling the tail end of the attracted probe to be warped up; and the automatic probe aligning and filling device is used for collecting or emitting the probes. The probes are packaged on the probe blister packaging plate, the automatic probe feeding device automatically unpacks the packages, and the automatic probe aligning and filling device automatically adsorbs and emits the probes, so that the probes are automatically replaced. The large workload and the cross infection risk caused by manual operation can be eliminated. The operation time can be saved, and the working efficiency is improved. And the user can operate the springback intraocular pressure timing more conveniently.

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).

Systems, methods, and devices for disinfecting tonometer probes are described. One example provides a specialized container that allows easy catching of a used probe without having to touch the probe, allows for the storage of multiple used probes, allows for simple disinfection of the probes without having to handle the probes or remove them from the container, allows for rinsing of the probes and container without handling the probes, and then allows for the simple insertion of the disinfected probes directly from the container without having to touch the probes or reinsert them into their specialized tubes.

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 invention discloses a contact type intraocular pressure measurement method, device and equipment based on data learning and a storage medium, and belongs to the technical field of intraocular pressure measurement. The method comprises the following steps: preparing intraocular pressure measurement based on personal data of a user to obtain prepared intraocular pressure measurement equipment; the intraocular pressure measuring probe abuts against the eyelids of the user for measurement, and intraocular pressure data of the user are obtained; and performing intraocular pressure calculation based on the user intraocular pressure data and the prepared intraocular pressure measurement equipment to obtain a user intraocular pressure value. The intraocular pressure measurement is prepared according to the personal data of the user, then intraocular pressure measurement is started, finally, intraocular pressure calculation is performed based on the obtained intraocular pressure data of the user, the intraocular pressure value of the user is obtained, a patient does not need to open eyes for measurement in the whole intraocular pressure measurement process, the contact infection risk is avoided, and the intraocular pressure measurement cost is reduced.

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.

The invention belongs to the technical field of ophthalmology clinical medical treatment, and particularly discloses a crack light path generation system based on a blowing type non-contact tonometer, the crack light path generation system comprises a main crack light path system and a make-up crack light path system, a main crack light path and a make-up crack light path are synthesized into a conjugate light path through a flat spectroscope, and the conjugate light path is generated through a front crack light path incidence mode. Light intensity uniformity in the length direction of a crack light spot is achieved, the problems that an oblique double-crack light path is large in design and structure difficulty, and the light intensity of an imaging light spot and the width of a crack are not uniform are solved, meanwhile, on the basis of front incidence imaging, the view field range of 18 mm can be achieved, and the imaging precision is improved. And imaging and further biomechanical analysis of the whole region of the angular sclera are facilitated.

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.

The present invention discloses a method for determining whether a tonometer indenter reaches flattening based on the force applied to the indenter, comprising: 1) extracting displacement data and force data of the indenter in the direction of insertion during the indentation of the tonometer; 2) derivatizing the force data with respect to the displacement data to obtain a rate of change of the indenter force with respect to the indenter insertion depth, i.e., the displacement; 3) drawing a curve of the rate of change of the indenter force with respect to the indentation depth, wherein the rate of change of the indenter force with respect to the indentation depth is the Y axis and the indentation depth is the X axis; 4) finding the maximum value in the middle of the curve of the rate of change of the indenter force with respect to the indentation depth during the indentation process, i.e., the moment when the indenter reaches flattening. The present invention determines whether the indenter reaches flattening based on the force applied to the indenter by the tonometer, can determine whether the indenter reaches flattening according to the force applied to the indenter, alleviates the difficulty of directly observing the contact image between the indenter and the cornea, and simultaneously improves the accuracy of determination, and has broad prospects in the use of various types of tonometers.

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.