Radiation imagery chemistry: process – composition – or product th – Combined
Patent
1994-09-02
1995-11-14
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Combined
430966, 430967, 206455, 378168, 378169, 378182, A61B 614, G03B 4202, G03B 4204, G03C 300
Patent
active
054665612
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an image plate for intra-oral dental X-ray photography, the plate being placed in a shield in which the plate is kept during photography and out of which the plate can be taken for the reading out of the image after photography.
FIELD OF THE INVENTION
Film which is in a foil package during photography has conventionally been used in intra-oral dental X-ray photography. Xray film is photosensitive, for which reason the opening of the package after photography and the transfer of the film to development have taken place in a darkroom.
BACKGROUND OF THE INVENTION
There is also known a cassette for intra-oral dental X-ray photography, which contains an image plate sensitive to X-rays. The functioning of the selenium-containing image plate is based on the adherence of pigment to the plate surface. The disadvantage of the system is that holding the thick and rigid cassette in the mouth is cumbersome.
The object of the present invention is to provide an image plate particularly suited for intra-oral dental photography, avoiding the above-mentioned disadvantages of prior-art systems. The invention, in which the image plate is placed in a shield in a manner known per se, is characterized in that the shield has been made pervious to X-rays but impervious to visible light, and that the shield comprises a closed shielding bag of plastic membrane.
BRIEF SUMMARY OF THE INVENTION
The image plate according to the invention, with its bag-like plastic shield, can be made substantially thinner than the prior-known cassette which contains an image plate, and consequently its use is more comfortable for the patient. As compared with intra-oral film, the advantage of the invention is that the image plate is less sensitive to external light than is film. The bag-like shield impervious to light thus constitutes a sufficient shield for the image plate between photography and the reading out of the plate, and the darkroom required by films is not needed for the handling of the plate.
DETAILED DESCRIPTION OF THE INVENTION
According to one preferred embodiment of the invention, the shield is made up of an inner bag impervious to light and a closed outer bag of plastic membrane, enveloping the inner bag. The outer bag may be of a transparent plastic material, and its sealing and opening should be maximally easy. The purpose of the outer bag is to prevent the patient's saliva from ending up in the read-out apparatus along with the inner bag and to protect the patient from any pathogens which may have ended up on the surface of the image plate. The inner bag impervious to light may be of black plastic membrane, or alternatively of black cardboard, and it may be left open at one end.
The said inner bag impervious to light is preferably at one end open and at the other end equipped with a pulling lug by which the bag can be pulled from around the image plate. The image plate end at the open end of the bag may further be equipped with a metal part which can be held by a magnet belonging to the pulling device used in the reading out of the image. The image plate can in this case be introduced with its bag into the read-out apparatus without the plate being exposed to outside light at any stage before the apparatus. The pulling off of the bag will not take place until the pulling device has gripped the end of the plate which is protected from light in the read-out apparatus.
It is also possible that the shield comprises only one bag, which is made of a plastic membrane impervious to light and is closed during photography. After photography the bag is opened at one end, whereafter the image plate can be taken out, for example by means of a magnet adhering to the metal part at the end of the plate in accordance with what has been stated above.
When each end of the image plate is equipped with a metal part, there is the further advantage that the plate can be placed in either direction in the bag open at one end. When the pulling out of the plate from the read-out apparatus and its reinsertion into t
REFERENCES:
patent: 3551673 (1970-12-01), Siegel
patent: 3741386 (1973-06-01), Schmidt
patent: 3958693 (1976-05-01), Greene
patent: 4913288 (1990-04-01), Tanaka
patent: 5077779 (1991-12-01), Steinhausen
Bowers Jr. Charles L.
Huff Mark F.
Orion-yhtyma Oy
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