JPS5837370Y2 - Dental X-ray irradiation device - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a dental X-ray irradiation device.

In a dental X-ray irradiation device, an X-ray irradiation tube (commonly called a dental cone) is installed, and X-rays are irradiated to the affected area through this irradiation tube.

Incidentally, in the past, bullet-shaped X-ray irradiation tubes have generally been used, but since there is a high risk of generating scattered X-rays, open-type cylindrical tubes are currently used.

Now, using such an irradiation tube, it requires considerable experience and skill to position the irradiation tube in such a way that the effective irradiation field of the X-rays reliably matches the X-ray film placed inside the patient's mouth. shall be.

This is because the film is positioned inside the oral cavity, so it is difficult to see the entire film, so when a small irradiation field is used, a small amount of X
This is because a deviation in the direction of irradiation of the rays may also lead to a fatal failure in which portions of the film are not irradiated with the X-rays.

Moreover, if irradiation is performed inadvertently, a misalignment between the X-ray film and the irradiation field may occur, resulting in cases in which a necessary photograph of the affected area cannot be obtained and re-photographing must be performed.

Such a situation is not a good thing for Imada, who is trying to reduce the amount of radiation exposure.

This invention aims to provide a dental X-ray irradiation device that eliminates these conventional drawbacks.

In other words, this idea is a device that irradiates an irradiated object with X-rays through an irradiation tube and photographs the irradiated object, and a visible optical light emitter is positioned coaxially with the X-ray irradiation axis within the irradiation tube. , installed so that the position can be switched between a position evacuated outside the X-ray irradiation area, and also coaxial with the X-ray irradiation axis on the opposite side of the illuminant to the irradiated object side within the irradiation cylinder, This dental X-ray irradiation device is characterized in that a concave reflecting mirror having a through hole for an X-ray irradiation cone is fixedly installed in the center thereof.

This invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view showing the overall appearance of the dental X-ray irradiation device according to this invention.

In the illustrated example, it is a mobile device in which a main body H is placed on a trolley, and an X-ray generator XG is suspended from the tip of a omnipresent arm A.

An irradiation tube DC is attached to the X-ray irradiation port of the X-ray generating section XG to regulate the irradiation direction (irradiation field) of the X-rays.

Therefore, X-ray photography can be performed accurately by directing the irradiation tube DC toward the desired location of the tooth.

In order to accurately direct this irradiation tube to the desired location,
In this invention, a visible optical system, which will be described later, is installed in the irradiation tube DC, and this visible optical system creates a visible optical spot on the X-ray irradiation axis.

Therefore, the direction of the irradiation tube DC can be adjusted by moving the arm A and the X-ray generating section XG so as to align this spot with the imaging position.

After the alignment of the irradiation axis with the visible optical spot and the desired location is completed, the desired location is irradiated with X-rays and imaged.

Details of the irradiation tube DC, which is a feature of this invention, are shown in Figures 2 and 3.
This is made clear by the embodiments shown in the figures.

The main parts of this invention will be explained below with reference to these drawings.

In FIGS. 2 and 3, only the irradiation tube DC is shown in a state where it is removed from the X-ray generating section XG.

FIG. 2 shows a longitudinal sectional view of the irradiation tube according to this invention taken along the plane of the X-ray irradiation axis a.

First, the embodiment shown in FIG. 2 will be described. Reference numeral 1 denotes a cylinder constituting the main body of the irradiation tube, and its right end is attached to the X-ray generating section XD.

X indicates an X-ray source.

3 is a baffle plate attached to the opening 2 of the cylinder 1;
A through hole 2H for X-rays is bored.

The shield plate 3 is connected to the shield tube 1 via the support plate 11.
2 is attached.

X-rays from the X-ray source X are irradiated onto the irradiated object M using this irradiation tube, with a point F as the center.

By the way, according to this invention, a visible optical system is installed whose optical axis is this X-ray irradiation axis a, and the visible optical system is located opposite to the light emitting part, that is, the light bulb 6 and the irradiated object M side, as shown in the figure. A concave reflecting mirror 5 is fixed to the shielding tube 12 on the side thereof, and the concave reflecting mirror 5 has a through hole 5' sufficient for passing the X-ray cone regulated by the inner cone of the shielding tube 12. It has a central location.

As is clear from the drawing, the visible optical systems 5 and 6 converge light on their optical axes, and if the object M to be irradiated is positioned at this condensing part, a visible optical spot is created on the X-ray irradiation axis. It turns out.

The position of this spot indicates the X-ray irradiation position.

Reference numeral 4 denotes a battery, which is housed in a cover 8 attached externally to the cylinder 1, and is connected to the light bulb 6 by a lead wire (not shown).

By the way, if the light bulb 6, its socket, support rod, and other mechanisms are present in the X-ray irradiation field, an interfering image will be recorded on film, which will interfere with the shooting. When the process is finished, it is necessary to evacuate from the position of the optical axis a to the outside of the X-ray irradiation area.

The nozzle 9 and the light bulb support rod 7 are provided for this purpose, and the support portion 7' of the support rod 7 is supported by the support base 10 so that the support rod 7 can swing around a fulcrum O.

As is clear from FIG. 3, the fulcrum O is located outside the cylinder 1, and therefore, when the bundle 9 is tilted to the left as shown in FIG. 3, the light bulb 6 is retracted to the position indicated by the one-dot chain line.

When the light bulb 6 is retracted to position b, it is removed from the X-ray irradiation field.

The light bulb 6 may be automatically retracted, and a push button for operating the same may be provided.

Furthermore, it is convenient to control the energization of the light bulb 6 in relation to its advance and retreat movements.

Since the dental X-ray irradiation device of this invention is configured as described above, when irradiating the object with X-rays through the irradiation tube, one visible optical spot is created on the X-ray irradiation axis. This allows the X-ray irradiation field to be accurately aligned to the desired X-ray imaging location.

In this case, since the annular concave reflector 5 is fixed on the outside of the X-ray cone constricted by the shield tube 12 of the X-ray irradiation tube, when the visible optical mechanism is retreated from the X-ray irradiation area during X-ray photography, Only the light emitting body, that is, the lamp, needs to be evacuated, there is no need to move the light emitting body and the concave reflector as a unit, and the operation mechanism is simple. Interfering images are taken on the photographic film and the X-ray photographing screen is determined to be defective. By eliminating the need for any absorbing member in the fixed portion of the X-ray cone, it is possible to prevent the quality of photographed images from deteriorating.

Furthermore, in this invention, the degree of convergence and spot shape of the light obtained by locating the annular concave reflector and the light emitter on the same axis and at a constant interval are determined by the distance from the object to which the light is projected. It is characterized by

In other words, at the maximum focusing distance, the light is projected as a clear spot with a ring around it, and as it gets closer than that distance, the diameter of the spot increases, but the ring around it is clear, and there is no need to worry about misidentifying the center. do not have.

However, when the distance is greater than the maximum convergence distance of the light, the diameter of the light becomes large on the object to be irradiated, and it becomes scattered light, making the circle unclear, and it becomes possible to match the distance, that is, the diameter of the irradiation field.

[Brief Description of the Drawings] Figure 1 is a perspective view showing the external appearance of the dental X-ray irradiation device of this invention, and Figures 2 and 3 are diagrams showing the structure of the irradiation tube, which is the main part of this invention. , FIG. 2 is a longitudinal sectional view of the irradiation barrel, and FIG. 3 is a view taken along III-III' of FIG. 2. H...X-ray irradiation device main unit, A...Flexible arm, XG...X-ray generation section, DC...
...Irradiation tube, 1...Cylinder, 3...Shiyahei plate, 4...Battery, 5...Concave reflector, 5'... ...X-ray cone through hole of concave reflector, 6...
...Light bulb, 7...Support rod, 8...
Cover, 9...Bundle, 11...Support plate, 12...Shiyahei tube, a...X
Line irradiation axis.

Claims (1)

[Scope of utility model registration request] In a device that irradiates an irradiated object with X-rays through an irradiation tube and photographs the irradiated object, a visible optical light emitter is placed in the irradiation tube at a position coaxial with the X-ray irradiation axis and It is installed so that it can be switched to a position where it is evacuated outside the irradiation area, and also within this irradiation tube, there is a light emitting body on the side opposite to the irradiated object side, coaxial with the X-ray irradiation axis, and in the center. A dental X-ray irradiation device, characterized in that a concave reflecting mirror having a through hole for an X-ray irradiation cone is fixedly installed.