Compensated head position measurement device and method

Abstract

The application discloses a compensatory head position measuring device and method, and relates to the technical field of compensatory head position measurement, comprising a head-mounted angle measuring unit, a signal receiving unit, a control processing unit and an execution unit; the head-mounted angle measuring unit comprises a laser emitting device, a first lens and a polarizer, is used for emitting linearly polarized light according to the head rotation of a patient; the signal receiving unit comprises a magneto-optical modulator, a polaroid, a second lens and a photodetector, is used for magnetooptically modulating the linearly polarized light emitted by the head-mounted angle measuring unit; the execution unit is used for rotating the signal receiving unit, and makes the head-mounted angle measuring unit and the signal receiving unit orthogonally aligned; the control processing unit is used for controlling the execution unit to operate, and obtaining the head rotation angle of the patient according to the frequency of the electric signal output by the signal receiving unit when the head-mounted angle measuring unit and the signal receiving unit are orthogonally aligned. The application can accurately and efficiently measure the compensatory head position of a patient, and has universal applicability and low requirement on the cooperation degree of the patient.

Description

Technical Field

[0001] This invention relates to the field of compensatory head position measurement technology, and more specifically to a compensatory head position measurement device and method. Background Technology

[0002] Head posture assessment is crucial for noncomitant strabismus caused by extraocular muscle paralysis or mechanical limitation, as well as surgery-related strabismus. Abnormal head posture associated with extraocular muscle diseases is called compensatory head posture, which is an abnormal head position that patients adjust to avoid diplopia or blurred vision. The main manifestations include left or right facial turning when the eyes rotate around the vertical axis, chin tuck or elevation when the eyes rotate around the horizontal axis, and head tilting to the left or right shoulder when the eyes rotate around the anteroposterior axis. It is most commonly seen in various types of paralytic strabismus, A / V strabismus, restrictive strabismus, or uncorrected oblique astigmatism. Some patients with congenital nystagmus use compensatory head posture to move the midline forward to achieve best visual acuity. Compensatory head posture can be corrected with prisms, astigmatism lenses, or surgical correction.

[0003] In clinical practice, detailed and accurate measurement of the three-dimensional angle of compensatory head position deflection can not only help to clarify the diagnosis, but also guide treatment. This includes the determination of prism power, guidance of surgical design, and evaluation of postoperative efficacy, all of which have very important clinical significance.

[0004] However, there are currently no satisfactory instruments and methods for measuring compensatory head position angles in clinical practice. Previously, arc-shaped perimeters were commonly used, but later, orthopedic goniometers were gradually accepted by ophthalmologists and became the standard clinical method. However, in actual clinical practice, measuring compensatory head position still presents problems. It cannot effectively measure young children who cannot cooperate, or mixed head positions involving simultaneous rotation along three axes. Furthermore, compensatory head position measurements are subjective due to instrument limitations, cannot be used for measuring complex three-dimensional compensatory head positions, and the measurement results have a certain degree of error, making accuracy unreliable.

[0005] Therefore, designing a device and method that can accurately and efficiently measure a patient's compensatory head position is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a compensatory head position measuring device and method to overcome the defects of the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A compensatory head position measurement device includes a head-mounted angle measuring unit, a signal receiving unit, a control processing unit, and an execution unit;

[0009] The head-mounted protractor unit is used to emit linearly polarized light based on the patient's head rotation. The linearly polarized light carries the azimuth information of the head-mounted protractor unit and the signal receiving unit, i.e., the patient's head rotation angle.

[0010] The signal receiving unit is used to perform magneto-optical modulation on the linearly polarized light emitted by the head-mounted protractor unit;

[0011] The execution unit is used to rotate the signal receiving unit so that the head-mounted protractor and the signal receiving unit are orthogonally aligned.

[0012] The control processing unit is used to control the operation of the execution unit and obtain the patient's head rotation angle based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and the signal receiving unit are orthogonally aligned.

[0013] Optionally, the head-mounted protractor unit includes a laser emitting device, a first lens, and a polarizer, wherein the first lens and the polarizer are sequentially arranged in the optical path of the emitted light from the laser emitting device.

[0014] Optionally, the signal receiving unit includes a magneto-optical modulator, an analyzer, a second lens, and a photodetector. The linearly polarized light emitted by the head-mounted angle measuring unit passes sequentially through the magneto-optical modulator, the analyzer, and the second lens before finally entering the photodetector.

[0015] Optionally, the execution unit is a motor connected to the signal receiving unit.

[0016] Optionally, a display unit is also included, which is connected to the control processing unit, for displaying the measurement results of the patient's head rotation angle.

[0017] A method for measuring compensatory head posture includes the following steps:

[0018] Linearly polarized light is emitted by the head-mounted triangulation unit worn by the patient;

[0019] The linearly polarized light is magneto-optically modulated;

[0020] Rotate the signal receiving unit so that the head-mounted protractor and the signal receiving unit are orthogonally aligned;

[0021] The patient's head rotation angle is obtained based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and signal receiving unit are orthogonally aligned.

[0022] Optionally, the head-mounted protractor and the signal receiving unit are orthogonally aligned based on the fact that the electrical signal output by the photodetector in the signal receiving unit is twice the frequency of the modulation signal output by the magneto-optical modulator.

[0023] As can be seen from the above technical solution, the present invention provides a compensatory head position measuring device and method, which has the following beneficial effects compared with the prior art:

[0024] (1) High precision: Existing compensating head position angles are all accurate to the unit place, while the present invention can achieve measurement with percentile precision.

[0025] (2) Real-time performance: Traditional compensatory head position requires measurement in three directions, while the present invention can realize real-time reading of the compensatory head position angle, and the reading time can be limited to within 0.1 milliseconds.

[0026] (3) Universality: Traditional compensatory head position measurement requires a high degree of cooperation from the person being measured to ensure measurement accuracy. This invention reduces the required degree of cooperation by using a head-mounted angle measuring unit, thus reducing the difficulty of measurement. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the device structure of the present invention;

[0029] Figure 2 This is a schematic diagram illustrating the principle of the method of the present invention;

[0030] Figure 3 This is a schematic diagram of the Fick coordinate axis in this invention;

[0031] Figure 4 This is a schematic diagram of the external structure of the head-mounted protractor unit in this invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention discloses a compensatory head position measuring device, see [link to relevant documentation]. Figure 1 It includes a head-mounted protractor unit, a signal receiving unit, a control processing unit, and an execution unit;

[0034] The head-mounted triangulation unit is used to rotate according to the patient's head position and emit linearly polarized light. See external structure for details. Figure 4 The linearly polarized light carries the azimuth information of the head-mounted protractor and the signal receiving unit, i.e., the patient's head rotation angle. The internal structure of the head-mounted protractor includes a laser emitting device, a first lens, and a polarizer, which are sequentially arranged in the optical path of the emitted light from the laser emitting device.

[0035] In a specific embodiment, the laser emitting device is a laser, the first lens is a convex lens, and the polarizer can be a polarizer, a Nicol prism, etc.

[0036] The signal receiving unit is used to magneto-optically modulate the linearly polarized light emitted by the head-mounted protractor. The signal receiving unit includes a magneto-optical modulator, an analyzer, a second lens, and a photodetector. The linearly polarized light emitted by the head-mounted protractor passes sequentially through the magneto-optical modulator, the analyzer, and the second lens, and finally enters the photodetector.

[0037] In a specific embodiment, the analyzer can also be a polarizer, which works in conjunction with the corresponding polarizer in the head-mounted angle measuring unit to check whether the light beam is polarized. The second lens is a convex lens.

[0038] The actuator is used to rotate the signal receiving unit so that the head-mounted protractor and the signal receiving unit are orthogonally aligned, i.e., the polarizer and analyzer are in the extinction position. The actuator can be a motor connected to the signal receiving unit.

[0039] The control processing unit controls the operation of the execution unit and calculates the patient's head rotation angle by performing an arctangent transformation based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and signal receiving unit are orthogonally aligned. This control processing unit can employ a central processing unit (CPU) or other device capable of processing data and issuing control commands.

[0040] In another embodiment, the device further includes a display unit connected to the control processing unit for displaying the measurement results of the patient's head rotation angle. The display unit may be an LED display screen to display the angle measurement parameters.

[0041] In another embodiment, the device further includes a power supply unit connected to the execution unit, the head-mounted protractor unit, the signal receiving unit, and the control processing unit, respectively, for supplying power to the operation of each instrument.

[0042] This invention also discloses a method for measuring compensatory head position, see [link to relevant documentation]. Figure 2 This includes the following steps:

[0043] Linearly polarized light is emitted by the head-mounted triangulation unit worn by the patient;

[0044] The linearly polarized light is magneto-optically modulated;

[0045] Rotate the signal receiving unit so that the head-mounted protractor unit and the signal receiving unit are orthogonally aligned, that is, the electrical signal output by the photodetector in the signal receiving unit is twice the frequency of the modulation signal output by the magneto-optical modulator. This judgment process can be performed by the control processing unit.

[0046] The patient's head rotation angle is obtained based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and signal receiving unit are orthogonally aligned.

[0047] The eyeball is approximately spherical, and its movements occur along three axes around the eye socket: vertical movement around the horizontal axis (x-axis), rotational movement around the anterior-posterior axis (AP-axis or y-axis), and horizontal movement around the vertical axis (z-axis). This coordinate system is called the Fick coordinate system. Figure 3 ).

[0048] The rotation of the compensatory head position usually occurs in the following situations:

[0049] ① When the eyeballs rotate around the vertical axis (z-axis), the face turns to the right or left. For example, a 30° turn to the right is represented by z(+30), a 30° turn to the left is represented by z(-30), and z(0) indicates that the face is in a neutral position with no left or right turn.

[0050] ② When the eyeballs rotate around the horizontal axis (x-axis), the mandible is raised or retracted. For example, a 30° mandible is raised by x(+30), a 30° mandible is retracted by x(-30), and x(0) indicates that the mandible is in a neutral position without any raising or retraction.

[0051] ③ When the eyeballs rotate around the front-back axis (y-axis), the head tilts to the right or left shoulder. For example, a 30° tilt to the right shoulder is represented by y(+30), a 30° tilt to the left shoulder is represented by y(-30), and y(0) indicates that the head is in a neutral position without tilting to the left or right shoulder.

[0052] For example, when a patient wears the device of the present invention and operates according to the above method steps, the reading result is as follows: z(+12.25)x(-6.12)y(+9.35), which indicates that the patient's compensatory head position is facing to the right with a deviation of 12.25°, a mandibular retraction of 6.12°, and a head tilt to the right shoulder of 9.35°.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A compensatory head position measuring device, characterized in that, It includes a head-mounted protractor unit, a signal receiving unit, a control processing unit, and an execution unit; The head-mounted protractor unit is used to emit linearly polarized light based on the patient's head rotation. The linearly polarized light carries the azimuth information of the head-mounted protractor unit and the signal receiving unit, i.e., the patient's head rotation angle. The signal receiving unit is used to perform magneto-optical modulation on the linearly polarized light emitted by the head-mounted protractor unit; The execution unit is used to rotate the signal receiving unit so that the head-mounted protractor and the signal receiving unit are orthogonally aligned. The control processing unit is used to control the operation of the execution unit and obtain the patient's head rotation angle based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and the signal receiving unit are orthogonally aligned.

2. The compensatory head position measuring device according to claim 1, characterized in that, The head-mounted protractor unit includes a laser emitting device, a first lens, and a polarizer, which are sequentially arranged in the optical path of the emitted light from the laser emitting device.

3. The compensatory head position measuring device according to claim 1, characterized in that, The signal receiving unit includes a magneto-optical modulator, an analyzer, a second lens, and a photodetector. The linearly polarized light emitted by the head-mounted angle measuring unit passes sequentially through the magneto-optical modulator, the analyzer, and the second lens before finally entering the photodetector.

4. The compensatory head position measuring device according to claim 1, characterized in that, The execution unit is a motor connected to the signal receiving unit.

5. The compensatory head position measuring device according to claim 1, characterized in that, It also includes a display unit, which is connected to the control processing unit, for displaying the measurement results of the patient's head rotation angle.

6. A method for measuring compensatory head position, characterized in that, Includes the following steps: Linearly polarized light is emitted by the head-mounted triangulation unit worn by the patient; The linearly polarized light is magneto-optically modulated; Rotate the signal receiving unit so that the head-mounted protractor and the signal receiving unit are orthogonally aligned; The patient's head rotation angle is obtained based on the frequency of the electrical signal output by the signal receiving unit when the head-mounted protractor and signal receiving unit are orthogonally aligned.

7. The compensatory head position measurement method according to claim 6, characterized in that, The orthogonal alignment of the head-mounted protractor and the signal receiving unit is based on the fact that the electrical signal output by the photodetector in the signal receiving unit is twice the frequency of the modulation signal output by the magneto-optical modulator.

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