JPH0225371Y2 - - Google Patents

Description

[Detailed description of the device] a. Technical field The device transmits ultrasonic pulses from an ultrasonic transducer into the eyeball to be measured, receives the reflected waves from each tissue in the eyeball, and measures each of the eyeballs. The present invention relates to an ultrasonic probe for measuring axial length of the eye that measures the length between tissues.

b. Prior art and its problems Ultrasonic probes for measuring axial length transmit ultrasonic pulses from the surface of the eyeball to be measured into the eyeball, and detect discontinuities in acoustic impedance expressed as the product of the density of the medium and the speed of sound. This reflected ultrasound pulse reflected at the boundary surface is received, and the distance between the discontinuous interfaces is measured from the reflection intensity of the reflected ultrasound pulse and the reception time, and this information is used for diagnosis. .

The second example of the conventional ultrasonic probe for measuring axial length is shown below.
As shown in the figure. In FIG. 2, a conical case 2 is attached to a cylindrical case 1, an elastic membrane 3 made of rubber or the like is attached to the tip of the conical case 2, and a medium 4 such as water is sealed inside. . An ultrasonic transducer 5 is arranged in the cylindrical case 1 coaxially with the cylindrical case 1 and the conical case 2, and a wave transmission surface 5a of the ultrasonic transducer 5 is arranged in the direction of the conical case 2. Wiring of the ultrasonic vibrator 5 is accomplished by soldering a conductor 7 from a cord 6 to a terminal 5b. In addition to the terminal 5b, an optical fiber 8 is connected to the back of the ultrasonic transducer 5.
It is disposed so as to penetrate the center of the ultrasonic transducer 5 and protrude to the rear of the ultrasonic transducer 5 from the wave transmission surface 5a.

At the rear of the ultrasonic transducer 5, a light emitter 9 such as an LED is further attached to the cylindrical case 1 via a mounting piece 10, and the wiring for the light emitter 9 is done by soldering a lead wire 11 from the cord 6. It has been done well. The cord 6 is fixed to the cylindrical case 1 by a cord holder 12.

Here, the optical fiber 8 and the light emitter 9 are used to align the measuring direction of the eyeball to be measured. That is, the light emitted by the light emitter 9 enters the optical fiber 8, passes through the center of the ultrasonic transducer 5, is emitted from the wave transmitting surface 5a of the ultrasonic transducer 5, passes through the medium 4, and then passes through the elastic membrane 3. It passes through and enters the eyeball to be measured coaxially with the transmission direction of the ultrasonic pulse. Therefore, by viewing the incident light, the patient can align the visual axis of the eye to be measured with the transmission axis of the ultrasound pulse, and each discontinuous boundary surface of acoustic impedance within the eye to be measured can be adjusted. It becomes possible to measure along the visual axis.

In the conventional ultrasonic probe for measuring axial length as described above, when the optical fiber 8 is made of resin, the wiring at the time of assembly, that is, the terminal 5b attached to the rear of the ultrasonic transducer 5 is soldered. At times, the optical fiber 8 is easily damaged by the heat of the soldering iron, and furthermore, it is difficult to set the end face of the optical fiber 8 in the center of the light emitting body 9, and when the optical fiber 8 is made of glass, it is susceptible to shock. There was a problem that it sometimes broke easily.

c. Purpose The present invention was made in view of the above points, and by providing an optical fiber fixing member that covers the optical fiber protruding from the ultrasonic transducer, the end face of the optical fiber can be easily placed near the center of the light emitter. A device for measuring axial length that can be fixed, prevents damage to the optical fiber due to heat when the optical fiber is made of resin, and protects the optical fiber from external impact when the optical fiber is made of glass. The purpose is to provide an ultrasonic probe.

d. Configuration of Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of one embodiment of the present invention. Incidentally, in FIG. 1, the same members as those in the conventional example shown in FIG.

In this embodiment, a fixing member 13 is arranged on the rear surface of the ultrasonic transducer 5 to cover the protrusion of the optical fiber 8 from the ultrasonic transducer 5 up to the vicinity of the light emitter 9. This fixing member 13 is fixed to the cylindrical case 1, and the optical fiber insertion hole of the fixing member 13 is opened coaxially with the cylindrical case 1 and the conical case 2. Further, a hole for passing the terminal 5b is formed in the vicinity of the optical fiber insertion hole of the fixing member 13 so that the inner circumference of the hole does not touch the terminal 5b, and the terminal 5b is inserted through this hole. It protrudes to the outside of the fixing member 13.

e Effects of the Embodiment Next, the effects of the embodiment of the present invention having the above configuration will be explained.

By attaching the fixing member 13 from the back side of the ultrasonic transducer 5, the optical fiber 8 is attached to the fixing member 1.
3. Protected and located. Further, the terminal 5b of the ultrasonic transducer 5 protrudes through a hole provided in the fixing member 13 without coming into contact with the fixing member 13, and is connected to and wired with the conducting wire 7 by soldering or the like.

f Effect As described above, according to the present invention, when the optical fiber is made of resin with a simple structure, it is possible to prevent damage to the optical fiber due to heat when wiring an ultrasonic transducer, and to connect the end face of the optical fiber to a light emitter. When the optical fiber is made of glass, it protects the optical fiber from external impact, and the end face of the optical fiber can be easily positioned near the center of the light emitter. This makes assembly and disassembly work easier and reduces work time. Furthermore, by using the fixing member as abutment for the ultrasonic transducer, it is possible to easily assemble and disassemble the ultrasonic transducer, which has a great effect in practical use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1... Tube case, 2... Conical case, 3...
Elastic membrane, 4... medium, 5... ultrasonic vibrator, 8...
...Optical fiber, 9... Luminous body.

Claims (1)

[Scope of utility model registration request] A conical case whose tip opening is sealed with an elastic membrane such as rubber, a cylindrical case attached to the conical case, an ultrasonic transducer disposed coaxially with the cylindrical case and the conical case, and the vibrator. a medium such as water sealed between and the elastic membrane, a light emitter disposed behind the oscillator, and a wave penetrating through the center of the oscillator from the wave transmission surface coaxially with the optical axis of the light emitter. In the ultrasonic probe for measuring ocular axial length, the ultrasonic probe is equipped with an optical fiber arranged to protrude rearward, and a cylindrical optical fiber fixing member that covers the optical fiber is provided between the transducer and the light emitter. An ultrasonic probe for measuring axial length of the eye.