JPH0553604U - Slit lamp microscope - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the front length and weight of a handheld slit lamp microscope, and to prevent the temperature of the device from rising. [Structure] The light source of the illumination unit 1 is provided outside, and both are connected by a fiber light guide 30. A guide arm 13 provided with an arc-shaped guide groove 14 is extended on a supporting portion 10 that supports the microscope portion 20 and the illuminating portion 1, and the illuminating portion 1 is run along the guide groove 14. The curvature of the arc of the guide groove is set so that the focus of the microscope coincides with the extension line of the virtual center.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a slit lamp microscope used for examining a human eye, and more particularly to improvement of a handheld slit lamp microscope.

[0002]

[Prior Art]

 The transparent body such as the cornea and lens of the eyeball is irradiated with strong slit light from the oblique direction from the illuminating part to cut the light, and the microscopic abnormality is raised by the scattering of the fine substance in the tissue. The device has long been known as a slit lamp microscope.

Initially, this type of device was generally of a stationary type, but in recent years, a handheld device is also commonly used, and it is widely used for medical practitioners, round visits, and home visits.

In this hand-held slit lamp microscope, a columnar grip for supporting the microscope section at the upper side and a supporting section composed of an arm projecting from the lower side of the grip to the front side are provided. A structure in which an illuminating unit is supported on a lever that swings around an axis on an arm has been publicly known (as a publicly known document, Nagai Shoten Co., Ltd., April 1, 1972, edited by Tadashi Shimoshima, "Medical "Optical machinery", published by Kanehara Publishing Co., Ltd. June 20, 1980, second edition "Ophthalmology MOOK NO.3-Ophthalmic General Examination Method", etc.). This invention makes them direct prior art.

[0005]

[Problems to be solved by the device]

 However, the above-mentioned conventional techniques have the following problems, and their improvement has been desired. Firstly, in the above-mentioned prior art device, the illuminating part is constructed so as to swing by a lever around an axis on the arm, and in this case, the focus position of the microscope, that is, the eyeball, is naturally on the extension line of the axis. Since there is a match, the device inevitably comes close to the face or chest of the person being inspected, which may interfere with the inspection work.

Secondly, since the above-mentioned prior art device has a built-in light source, the vicinity of the light source of the illumination section is likely to become hot, which may cause burns when accidentally contacted with the person to be inspected. There was a risk, and this risk was particularly high when the subject was an infant whose behavior was not consistent.

Thirdly, for the same reason as above, the weight is inevitably increased, and especially when an attempt is made to provide the light source with a sufficient heat radiation effect, the apparatus becomes large and the weight is increased, and a weak female inspector is required. There is a problem in that it is difficult to handle, not only when it is used by a person, but also when it is used by a subject who is in bed, for example, a male.

[0008]

[Means for Solving the Problems]

 This invention was created with the objective of solving the problems of the prior art as described above.The light source of the illumination unit is provided outside and both are connected by the fiber light guide, while the microscope unit is A columnar grip that supports the upper part and a guide arm that extends from the lower part of the grip toward the front form a support part, and this guide arm is provided with an arc-shaped guide groove through which the illumination part travels. , The guide groove is configured so that the curvature of the circular arc is set so that the focus of the microscope coincides with the extension line of the virtual center.

[0009]

[Action]

 Therefore, according to this invention, the illumination unit is configured to run along the arc-shaped guide groove, and the curvature of this arc is set so that the focus of the microscope coincides with the extension line of the virtual center. , By moving along the guide groove, the illuminating part always makes a circumferential movement toward the eyeball, and the same effect as when it is supported on a swinging lever can be obtained. Moreover, in this case, since the lever that swings around the shaft is not required, the front end of the device can be retracted to the vicinity of the guide groove, and the front length of the device can be significantly shortened, and the amount of The effect is to reduce weight.

On the other hand, since the light source of the illuminating unit is provided outside and both are connected by the fiber light guide, the illuminating unit does not become hot and the weight of the light source and the heat radiating portion is reduced. Produce an effect.

[0011]

【Example】

 Specific embodiments of the present invention will be described below with reference to the accompanying drawings. The slit lamp microscope of the present invention comprises a hand-held body operated by an inspector, a light source unit placed on a desk, and a fiber light guide connecting both.

FIG. 1 is a diagram showing an entire handheld body. This handheld main body is composed of an illuminating section 1 for irradiating the eyeball with slit light, a microscope section 20 for observing the eyeball, and a supporting section 10 for supporting these.

The support portion 10 is composed of a columnar grip 11 to be gripped by an inspector and a guide arm 13 that extends from below the grip 11 toward the front via an extension arm 12. A microscope unit 20 is supported above the.

The microscope unit 20 is a known binocular stereomicroscope, has a pair of objective lenses 21 and 21, and eyepieces 22 and 22, and a forehead support 25 is arranged in front. The forehead rest 25 is for positioning the eyeball at the working distance of the microscope section 20 by bringing the tip into contact with the subject's forehead, and a sheath projecting in front of the microscope section 20. It is slidably fitted in 23 and is fixed at an appropriate position by a clamp 23a. In addition, a spring is built in the sheath 23 for facilitating the positioning by constantly urging the forehead support 25 in the forehead direction (not particularly shown).

The guide arm 13 is to serve as a guide for circumferentially moving the illuminating section 1, and an arc-shaped guide groove 14 for moving the illuminating section 1 is provided on the top plate thereof. It goes without saying that the guide groove 14 is set so that the curvature of the circular arc matches the focal point of the microscope on the extension line of the virtual center.

FIG. 2 is a diagram showing the internal structure of the guide arm 13 and the illumination unit 1. Reference numeral 2 in the drawing denotes a lens barrel of the illumination unit 1, and a leg 3 to be slidably fitted in the guide groove 14 of the guide arm 13 is provided at the lower end of the lens barrel. In the figure, reference numeral 4 is a stopper for slidably fixing the illuminating unit 1 to the guide arm 13, and by externally fitting the leg 3 inserted in the guide groove 14, the bottom surface of the lens barrel 2 and this. The top plate of the guide arm 13 is clamped by the upper surface of the stopper 4. In this case, it goes without saying that the illuminating unit 1 slides only in the groove direction of the guide groove 14 and does not rotate in the axial direction. Therefore, in this embodiment, the front and rear wall surfaces of the stopper 4 are formed on the inner wall of the guide arm 13. It has a shape that makes sliding contact with and is a rotation stop. Although not shown, it goes without saying that a bearing may be used in combination in order to make the sliding contact between the front and rear wall surfaces of the stopper 4 and the inner wall of the guide arm 13 smoother.

The leg 3 of the lighting unit 1 described above is also used as a socket for a fiber light guide at the same time. That is, the leg 3 has a hollow shape that communicates with the inside of the lens barrel 2, and the plug 31 of the fiber light guide 30 is inserted therein and fixed by screwing the mounting ring 31a. The light transmitted from the light source section described later by the fiber light guide 30 is guided into the lens barrel 2 through the socket, passes through the condenser lens 6, the slit 7 and the projection lens 8, and then is illuminated by the illumination prism 9. Illuminated in the direction. In the figure, reference numeral 5 is a turret type filter plate, and reference numeral 7a is an opening / closing ring for opening / closing the slit 7.

FIG. 4 is a diagram showing the light source unit 40. The light source unit 40 has a structure in which a power source unit (not particularly shown) and a lamp 42 are built in a housing independent of the above-mentioned handheld main body. A socket 41 is arranged on the front surface of the lamp 42 via a heat insulating filter 43. The plug 32 of the fiber light guide 30 is inserted into the socket 41 and fixed by screwing an attachment ring 32a. In this embodiment, the fiber light guide 30 is provided with a curl cord-shaped bending portion 30a so that the fiber light guide 30 can be expanded and contracted as a whole to improve the convenience of accommodation and the operability of the handheld body. ing. In addition, reference numerals 44 and 45 in the figure denote a pillar that is erected above the light source unit 40 and a hook that is provided to the pillar. The function of accommodating the light source unit 40 in a suspended state is produced.

In using the slit lamp microscope described above, the forehead rest 25 is brought into contact with the forehead of the person to be inspected, and the handheld main body is gripped as usual to illuminate the eyeball with slit light, and the illumination unit 1 is turned on. By moving it with your fingertips, you change the angle at which light is cut. Incidentally, reference numeral 2a in the figure is a rubber ring for facilitating photographing of the illumination unit 1 at that time.

[0020]

[Effect of the device]

 The slit lamp microscope of the present invention configured as described above has the following unique effects. Since the lever for swinging the illumination unit around the axis is not required, the front length of the device is greatly shortened, and the device is moved away from the face and chest of the subject, improving workability. Since the light source is separated to the outside and transmitted by the fiber light guide, the lighting part does not become hot, so it is safe even if it contacts the inspected person, and it can be used safely even for infants whose behavior is not constant. become. For the same reason, the weight is reduced by the amount of the light source and the heat radiating portion, and the weight is reduced by the front length of the shortened device due to the above-mentioned reason. Not only can it be used easily by an inspector, but it can also be easily used by an inspector sleeping on a bed, for example. By separating the light source to the outside and transmitting it with a fiber light guide, it is not necessary to consider overheating and heat radiation, so it is possible to increase the size of the light source and secure the required illuminance.

[Brief description of drawings]

FIG. 1 is a perspective view of a slit lamp microscope according to the present invention with a light source section removed.

FIG. 2 is a partially cutaway side view of the same.

FIG. 3 is a front view of the same.

FIG. 4 is a partially cutaway side view of a light source section of the slit lamp microscope of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Illumination part 10 Support part 11 Grip 13 Guide arm 14 Guide groove 20 Microscope part 30 Fiber light guide 40 Light source part

Claims (2)

[Scope of utility model registration request] 1. An illumination unit for irradiating an eyeball with slit light,
In a slit lamp microscope consisting of a microscope section for observing this eyeball and a support section for supporting these, the light source of the illumination section is provided outside and both are connected by a fiber light guide, while the microscope section is supported above. The grip has a columnar shape and a guide arm that extends from the bottom of the grip toward the front. The guide arm is provided with an arc-shaped guide groove through which the illumination section travels. A slit lamp microscope characterized in that the curvature of the arc of the groove is set so that the focus of the microscope coincides with the extension line of the virtual center. 2. The slit lamp microscope according to claim 1, wherein the fiber light guide is bent into a curl cord shape.