Cantilever type extraocular muscle strength measuring instrument based on ultrasonic positioning

Abstract

The invention discloses a cantilever type extraocular muscle strength measuring instrument based on ultrasonic positioning, and relates to the field of ophthalmology medical instruments. The instrument comprises tweezers, a limiting device, a cantilever type pressure-sensitive force value monitoring system, a fixator and an ultrasonic integrated generator, and the limiting device, the cantilever type pressure-sensitive force value monitoring system and the fixator are sequentially arranged on the tweezers from left to right. An ultrasonic receiver for receiving a signal of the ultrasonic integrated generator is arranged on each of three surfaces of the fixer; the limiting device comprises a limiting column and a limiting buckle provided with a plurality of limiting grooves, and the limiting buckle is fixed in the different limiting grooves in the limiting column according to different requirements. According to the cantilever type extraocular muscle strength measuring instrument based on ultrasonic positioning, fixed-point and accurate measurement of extraocular muscle strength is achieved, and meanwhile the portability of the measuring instrument is improved.

Description

Technical Field

[0001] The present invention relates to the field of ophthalmic medical devices, and particularly to a cantilever type extraocular muscle force measuring instrument based on ultrasonic positioning. Background Art

[0002] The measurement of extraocular muscle force is an important research and clinical application topic in the field of ophthalmology. The normal function of the extraocular muscles is crucial for maintaining the normal position and movement of the eyeballs. Abnormalities in the extraocular muscles may lead to symptoms such as strabismus, diplopia, and abnormal eye movements, which are relatively common clinically, such as thyroid-related ophthalmopathy, myasthenia gravis, paralytic strabismus, congenital strabismus, and extraocular muscle fibrosis. At present, although certain progress has been made in the field of extraocular muscle force detection, the existing detection methods still have some limitations and have not reached a perfect level. For example, (CN216603251U) an extraocular muscle force quantitative measurement forceps for strabismus, although it uses a piezoresistive sensor and a tensile force display module, in terms of the measurement accuracy of extraocular muscle force, the insufficient accuracy of the piezoresistive sensor may significantly affect the accuracy of muscle force measurement, and it cannot accurately obtain the extraocular muscle force at a specific position. Another example is (CN 217429990U) an extraocular muscle force quantitative measuring instrument, which uses a piezoresistive sensor, a telescopic sleeve, and a device of a spectacle frame to measure the extraocular muscle force. While the measurement is not precise enough, only the overall quantified data of the extraocular muscle force is obtained. Therefore, it is very important to develop a measuring instrument with functions such as accurately measuring the extraocular muscle force at a fixed point. Summary of the Invention

[0003] The purpose of the present invention is to provide a cantilever type extraocular muscle force measuring instrument based on ultrasonic positioning, which can measure the magnitude of extraocular muscle force at a fixed point more precisely and is more portable.

[0004] To achieve the above purpose, the present invention provides a cantilever type extraocular muscle force measuring instrument based on ultrasonic positioning, including forceps, a limiting device, a cantilever type piezoresistive force value monitoring system, a fixator, and an ultrasonic integrated generator. The limiting device, the cantilever type piezoresistive force value monitoring system, and the fixator are sequentially arranged on the forceps from left to right. Ultrasonic receivers for receiving signals from the ultrasonic integrated generator are arranged on three surfaces of the fixator.

[0005] Preferably, the limiting device includes a limiting post and a limiting buckle provided with a plurality of limiting grooves, and the limiting buckle is fixed in different limiting grooves on the limiting post according to different needs.

[0006] Preferably, the cantilever type pressure-sensitive force value monitoring system includes a piezoresistive array, a temperature compensation resistor, and a force value display screen. The piezoresistive array, the temperature compensation resistor, and the force value display screen are all arranged on one side of the tweezers. The piezoresistive array includes a force-sensitive resistor and a piezoresistor. The force-sensitive resistor and the piezoresistor are respectively arranged on both sides of the holder.

[0007] Preferably, the holder divides the tweezers into a fixed end and a free end. The force-sensitive resistor is arranged on the free end near the holder, so that when the force-sensitive resistor is subjected to a bending moment, a resistance change occurs, thereby sensing the change in force. The piezoresistor is arranged on the fixed end near the holder, so that the piezoresistor is not affected by stress.

[0008] Preferably, the three ultrasonic integrated generators for emitting ultrasonic signals are respectively fixed at different positions in space. The ultrasonic integrated generator includes a frequency generator, an ultrasonic signal generator, and an ultrasonic transducer.

[0009] Preferably, the force value display screen is used to display the measured force value data in real time.

[0010] Advantages of the present invention:

[0011] (1) In the present invention, three ultrasonic integrated generators are placed at different fixed positions in space, and three ultrasonic receivers are installed on the holder. By measuring the time difference between the transmitted and received ultrasonic signals, the displacements in three directions in the space coordinate system can be measured. At the same time, a cantilever type force value monitoring system is used, and the principle of the cantilever is used to make the measured force value result more accurate, and the passive stretching stiffness of the extraocular muscle and the resistance moment stiffness coefficient of the eyeball rotation can be obtained therefrom.

[0012] (2) In the piezoresistive array of the present invention, the pair of resistors located on the cantilever is a force-sensitive resistor. When the cantilever beam deflects, the resistance changes. The other two resistors are outside the cantilever, and they are not affected by stress and are used for common mode signal compensation in the Wheatstone bridge. Two temperature compensation resistors are also adopted, which can ensure the measurement accuracy of the force value monitoring system under different temperature conditions, thereby improving the reliability and repeatability of the detection results.

[0013] (3) The limiting device provided by the present invention can not only ensure the stability of the extraocular muscle clamping, but also exclude the interference of the clamping force on the extraocular muscle muscle strength, and obtain a more accurate extraocular muscle muscle strength value.

[0014] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0015] Figure 1Schematic diagram of the structure of an embodiment of a cantilever-type extraocular muscle force measuring instrument based on ultrasonic positioning according to the present invention;

[0016] Figure 2 Schematic diagram of the structure of the ultrasonic integrated generator in the present invention;

[0017] Figure 3 Front view of an embodiment of a cantilever-type extraocular muscle force measuring instrument based on ultrasonic positioning according to the present invention.

[0018] Wherein, 1, forceps; 2, limiting device; 201, limiting column; 202, limiting buckle; 3, cantilever-type piezoresistive force value monitoring system; 301, force value display screen; 302, force-sensitive resistor; 303, piezoresistor; 304, temperature compensation resistor; 4, fixator; 5, fixed end; 6, ultrasonic receiver; 7, free end; 8, ultrasonic integrated generator; 801, frequency generator; 802, ultrasonic signal generator; 803, ultrasonic transducer. Detailed implementation manners

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0020] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] The following will describe in detail some embodiments of the present invention with reference to the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0022] Embodiment

[0023] As Figures 1 - 3As shown in the figure, a cantilever extraocular muscle strength measuring instrument based on ultrasonic positioning includes forceps 1, a limiting device 2, a cantilever type piezoresistive force value monitoring system 3, a fixator 4, and an ultrasonic integrated generator 8. The limiting device 2, the cantilever type piezoresistive force value monitoring system 3, and the fixator 4 are sequentially arranged on the forceps 1 from left to right. Ultrasonic receivers 6 for receiving signals from the ultrasonic integrated generator 8 are arranged on three surfaces of the fixator 4 to achieve ultrasonic spatial positioning as positioning points.

[0024] The limiting device 2 includes a limiting post 201 and a limiting buckle 202 provided with a plurality of limiting grooves. The limiting buckle 202 is fixed in different limiting grooves on the limiting post 201 according to different needs.

[0025] The cantilever type piezoresistive force value monitoring system 3 includes a piezoresistor 303 array, a temperature compensation resistor 304, and a force value display screen 301. The piezoresistor 303 array, the temperature compensation resistor 304, and the force value display screen 301 are all arranged on one side of the forceps 1. The piezoresistor 303 array includes a force sensitive resistor 302 and piezoresistors 303. The force sensitive resistor 302 and the piezoresistors 303 are respectively arranged on both sides of the fixator 4. The two piezoresistors 303 are used for common mode signal compensation and are respectively located on the tensile and compressive sides of the cantilever.

[0026] The fixator 4 divides the forceps 1 into a fixed end 5 and a free end 7. The force sensitive resistor 302 is arranged on the free end 7 near the fixator 4 so that when the force sensitive resistor 302 is subjected to a bending moment, a resistance change occurs, thereby sensing the change in force. The piezoresistor 303 is arranged on the fixed end 5 near the fixator 4 so that the piezoresistor 303 is not affected by stress.

[0027] Three ultrasonic integrated generators 8 for emitting ultrasonic signals are respectively fixed at different positions in space. The ultrasonic integrated generator 8 includes a frequency generator 801, an ultrasonic signal generator 802, and an ultrasonic transducer 803; the force value display screen 301 is used to display the measured force value data in real time.

[0028] Working principle: Before use, the frequency generator 801, the ultrasonic signal generator 802, and the ultrasonic transducer 803 are respectively placed at three different fixed positions in space; during use, the user holds the measuring instrument, uses the end of the forceps 1 to clamp a single extraocular muscle, fixes the limiting buckle 202 in a suitable limiting groove on the limiting post 201. At this time, the cantilever has a certain bending, and the force sensitive resistor 302 bears a certain strain. The sensor system will zero the force value at this time. At this time, the force value output by the force value display screen 301 is 0, that is, the interference of the clamping force on the measurement of the extraocular muscle strength is excluded. Before the forceps 1 moves, the ultrasonic integrated generator 8 sends an ultrasonic pulse, and the ultrasonic receiver 6 on the fixator 4 receives the signal, and calculates the initial distance between the forceps 1 and the ultrasonic integrated generator 8 according to the time difference between transmission and reception.

[0029] Subsequently, on the premise of ensuring that the patient's eyeball does not move as much as possible, the user moves the forceps 1, and the moving direction is basically perpendicular to the forceps 1 itself. When moving a certain distance, the force value on the force value display screen 301 is the extraocular muscle strength. Using the ultrasonic spatial positioning function again, the final distance of the ultrasonic receiver 6 at this time can be obtained, and thus the displacement of the positioning point of the forceps 1 can be obtained. Since the length of the forceps 1 is known, the moving displacement of a single extraocular muscle under the clamping of the forceps 1 can also be known. Thereby, the fixed-point and precise measurement of the extraocular muscle strength can be realized, and parameters such as the passive stretching stiffness of the extraocular muscle and the resistance moment stiffness coefficient of eyeball rotation can be further obtained.

[0030] Therefore, the present invention adopts a cantilever-type extraocular muscle strength measuring instrument based on ultrasonic positioning with the above structure to achieve fixed-point and precise measurement of the extraocular muscle strength, and at the same time improve the portability of the measuring instrument.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A cantilever extraocular muscle strength measuring instrument based on ultrasound positioning, characterized in that: The invention comprises tweezers, a limiting device, a cantilever pressure-sensitive force monitoring system, a fixture and an ultrasonic integrated generator. The limiting device, the cantilever pressure-sensitive force monitoring system and the fixture are arranged on the tweezers from left to right in sequence. An ultrasonic receiver for receiving the ultrasonic integrated generator signal is arranged on three surfaces of the fixture.

2. The cantilever extraocular muscle strength measuring instrument based on ultrasound positioning according to claim 1, characterized in that: The limiting device comprises a limiting column and a limiting buckle provided with a plurality of limiting grooves, and the limiting buckle is fixed in different limiting grooves on the limiting column according to different needs.

3. The cantilever extraocular muscle strength measuring instrument based on ultrasound positioning according to claim 2, characterized in that: The cantilever pressure-sensitive force monitoring system includes a pressure-sensitive resistor array, a temperature compensation resistor and a force value display screen. The pressure-sensitive resistor array, the temperature compensation resistor and the force value display screen are all arranged on one side of the tweezers. The pressure-sensitive resistor array includes a force-sensitive resistor and a pressure-sensitive resistor. The force-sensitive resistor and the pressure-sensitive resistor are respectively arranged on both sides of the fixture.

4. The cantilever extraocular muscle strength measuring instrument based on ultrasound positioning according to claim 3, characterized in that: The fixture divides the tweezers into a fixed end and a free end. The force-sensitive resistor is arranged on the free end near the fixture, so that the force-sensitive resistor generates a resistance change when subjected to a bending moment, thereby sensing a change in force. The varistor is arranged on the fixed end near the fixture, so that the varistor is not affected by stress.

5. The cantilever extraocular muscle strength measuring instrument based on ultrasound positioning according to claim 4, characterized in that: The three ultrasonic integrated generators for transmitting ultrasonic signals are respectively fixed at different positions in space, and the ultrasonic integrated generators include a frequency generator, an ultrasonic signal generator and an ultrasonic transducer.

6. The cantilever extraocular muscle strength measuring instrument based on ultrasound positioning according to claim 5, characterized in that: The force value display screen is used to display the measured force value data in real time.

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