EP0165980B1 - X-ray package for dental use - Google Patents

X-ray package for dental use Download PDF

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Publication number
EP0165980B1
EP0165980B1 EP19850900433 EP85900433A EP0165980B1 EP 0165980 B1 EP0165980 B1 EP 0165980B1 EP 19850900433 EP19850900433 EP 19850900433 EP 85900433 A EP85900433 A EP 85900433A EP 0165980 B1 EP0165980 B1 EP 0165980B1
Authority
EP
European Patent Office
Prior art keywords
container
package according
ray film
intensifying screen
mentioned
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19850900433
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165980A1 (en
Inventor
Riccardo Beraudo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0165980A1 publication Critical patent/EP0165980A1/en
Application granted granted Critical
Publication of EP0165980B1 publication Critical patent/EP0165980B1/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C3/00—Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives
    • G03C3/003—Individual packages for X-ray film, e.g. for dental applications

Definitions

  • the present invention generally refers to X-ray film packages for dental use of the type comprising a flexible, flat and light-impermeable container housing an X-ray film which can be exposed upon exposure of the container to a radioactive radiation source, normally an X-ray source.
  • the packages of this type generally comprise a sealed container of plastic material, paper or the like, which has dimensions allowing an easy introduction thereof into an oral cavity against the tooth portions to be X-ray examined.
  • the X-ray film which is normally coated with sensitive emulsions on both sides, must be processed with developing and fixing solutions so as to reveal and make stable the X-ray image. To perform such operations, generally it is necessary to tear the container and remove the film in a dark room.
  • the developing and fixing processing can be carried out in full light directly inside the package, when the container is provided with sacks or tanks which can be opened upon pressure and contain the necessary solutions. Examples of packages of this type are illustrated in US patents nos. 3,430,042 and 3,964,604.
  • the X-ray film is exposed to a direct radiation. As known, this involves long exposures of the patient and of the operator to the radiations, with all the dangers deriving therefrom.
  • intensifying screens are treated with fluorescent materials which can emit light upon activation due to the exposure to radiations, in particular to X-rays.
  • the light emitted by the fluorescent material exposes the light-sensitive emulsion in an extremely more effective way than direct exposure, thus appreciably cutting down the exposure times and/or the radiation quantity necessary to obtain a good image quality.
  • intensifying screens in X-ray film packages for dental use is known for instance from US patents nos. 2,049,447; 3,185,841; 3,419,719 and 3,433,950.
  • the intensifying screen is an integrating part of the package and is thrown away together with the container after exposure and processing (and removal for the examination) of the X-ray film.
  • the intensifying screen can be used only with the package, with which it is coupled, and therefore every single film requires its own intensifying screen. This makes the package expensive due to the high cost of the screen materials.
  • a film package for use with recoverable intensifying screens is described in French patent 1,451,258. This package includes a container openable at both ends for introduction of screens at one end and extraction of film at the other end for processing of the film itself outside of the container. This package requires undesired handling of the film before processing.
  • An aspect of the present invention is that of removing the above-mentioned drawbacks and is reached by providing an X-ray film package for dental use of the above-defined type with an intensifying screen which can be introduced and taken-out at full light through an opening in the container.
  • the container has the shape of a prolongated envelope having a first portion receiving the X-ray film and an intensifying screen, and a second portion communicating at one end thereof with the first portion and being opened at the opposite end for introducing and taking out said intensifying screen, the container being provided with protecting means to protect the X-ray film against light penetration through said opened end, said first portion of the container being liquid tight to contain the chemicals for the inside processing of the film after its exposure and removal of the screen.
  • the screen is conveniently provided with an appendage working as a handle.
  • an appendage working as a handle When the screen is inside the first portion of the container, this extends therefrom to the second portion and juts out of the above-mentioned opened end of the second portion (said appendage carrying symbols to identify the correct introduction of the screen into the container).
  • the first portion of the container advantageously has substantially the same dimensions of the X-ray film and the second portion of the container can be book-wise folded up against the first portion and can be connected therewith in a releasable way.
  • the package has been realized so as to facilitate the introduction and the correct positioning of the intensifying screen, thus removing any difficulty and risk of a wrong introduction by the user.
  • the preferred embodiment is where the X-ray film has a single side coated with sensitive emulsions, the intensifying screen has a single surface coated with fluorescent substances and the opposite surface coated with a radiation-impermeable substance, and auxiliary means are provided to assure the right positioning of the fluorescent surface of the screen against the emulsion-coated side of the X-ray film, after having introduced said screen into the container.
  • Such auxiliary means advantageously consist of an introduction strip, releasably placed inside the container and in contact with the emulsion-coated side of the X-ray film, carrying symbols which show the surface thereof on which the screen is to be placed (which, in its turn, carries symbols which, together with said symbols of the strip, show the right positioning thereof).
  • the introduction strip is advantageously provided with an appendage jutting out of the opened end of the container and with a frame- shape portion provided with elements which hold the X-ray film after development.
  • 10 shows an X-ray film package for dental use, as a whole, according to the present invention.
  • Package 10 essentially comprises a flat flexible container 12 wherein an X-ray film 14 has been placed according to modalities described hereinafter. r.
  • X-ray film 14 consists of a single-side coated film of the conventional type, i.e. having a sensitive emulsion coated on one side 16 thereof and the antihalo layer coated on the opposite side 18.
  • the dimensions of film 14 are the conventional ones for dental use, for instance 2 x 3, 3 x 4 or 4 x 5 cm.
  • the film can be for example of the type produced and put on the market by the Applicant under the name 3M CRT 7.
  • Container 12 has the general form of a rectangular prolongated envelope having a width substantially corresponding to that of film 14 and a length substantially twice the length of such film.
  • Envelope 12 is preferably realized by employing two coupled sheets, respectively a frontal one 12a and a dorsal one 12b made of a liquid-tight and light-tight plastic material, preferably polyethylene, or of resin-coated paper for foods.
  • the external surfaces of the two sheets 12a and 12b preferably are different in colors, for instance water-green and black, while the internal surfaces thereof are respectively black in color and radiation-impermeable in order to avoid light reflections for reasons which will be explained hereinafter.
  • Envelope 12 is ideally divided into two portions respectively shown under 20 and 22, the former (20) of which receives the X-ray film and the latter (22) communicates with one end thereof with the former and is opened in correspondence with its opposite end 24. Opening region 24 contains a lower-width tongue 26 jutting out therefrom and being obtained in frontal sheet 12a, while a pocket 28 is applied to dorsal sheet 12b in correspondence with the closed end of envelope 12.
  • the external surface of pocket 28 may advantageously contain writings in different languages (not shown) for a prompt identification of the dorsal surface of container 12.
  • the same external surface of pocket 28 advantageously carries on a side thereof a reference mark 30 consisting of a colored stamp the function of which will be explained hereinafter.
  • the function of said depression is that of screening and protecting X-ray film 14 from possible light penetration into container 12 through opening 24.
  • X-ray film 14 is placed within portion 20 of container 12 with the emulsion-coated side 16 thereof turned towards the inside of said container, i.e. towards the part opposite to relief 32.
  • the emulsion-coated side 16 is placed against the rectangular introduction strip 34, normally made of cardboard or the like, placed within the cavity of container 12 such that it can be removed.
  • Strip 34 is planned in 36 for writing the identification data of the X-ray image to be obtained on film 14 and is provided with an appendage 38 jutting outwards from the envelope in which an opening 40 is made, defined by holding parts 42, to receive film 14 after development.
  • appendage 38 carries a reference 44 similar to reference 30 to identify the orientation under which the X-ray exposure has been made.
  • an intensifying screen which consists of a flexible plastic material support 48, normally of polyester, having a rectangular shape corresponding to that of film 14 and a surface 50 made fluorescent by a rare earth phosphor layer coated thereon.
  • the other surface of support 48 is coated with a radiation-impermeable protection layer, conveniently consisting of a lead laminar sheet having a thickness of about 3-4 hundredths of millimeter.
  • Support 48 is provided with a narrow and long appendage 54, integral therewith, which can be used as a handle as explained with more details hereinafter.
  • appendage 54 can be folded towards the radiation-impermeable coating 52 along its line of junction with support 48.
  • the fluorescent surface 50 carries on one side thereof a reference 56, similarto references 30 and 44, which can be used in combination therewith to identify, after having exposed film 14, the position in which the X-ray exposure has been performed.
  • the intensifying screen is introduced into the package; in a second step prior to employment the introduction strip is pulled out and in a third and last step prior to exposure the second portion of the envelope is folded onto the first one.
  • Package 10 is formed by container 12 into which the X-ray film 14 and the introduction strip 34 are introduced according to the illustration in figures 3 and 5, while the intensifying screen 46 has notyet been introduced.
  • the intensifying screen is then introduced manually by introducing support 48 into the opening 24 between the dorsal sheet 12b and the introduction strip 34, with its fluorescent surface 50 turned towards such strip 34. Support 48 is then pushed by means of handle 54 to portion 20 of container 12 housing X-ray film 14.
  • handle 54 and strip 34 are both provided with respective marks 58, 60 which, together with references 30 and 48 or other marks or instructions not shown in the figures, guide the introduction of intensifying screen 46 in a correct way for X-ray exposure.
  • package 12 effectively takes the shape illustrated in figures 3 and 5, with support 48 adjacent to dorsal sheet 12b, the X-ray film adjacent frontal sheet 12a of container 12, introduction strip 34 placed between fluorescent surface 50 of support 48 and sensitive emulsion 16 of film 14, reference 56 placed in correspondence with reference 30 and handle 54 passing through portion 22 of container 12 and jutting out at its free end through opening 24.
  • the second step consists of pulling out the introduction strip 34 from container 12 by pulling appendage 38.
  • support 48 of screen 46 and X-ray film 14 result in direct contact one with the other, with fluorescent surface 50 against emulsion 16.
  • the last step more precisely consists of folding upthe package so as to obtain the shape illustrated in figures 1, 2 and 6. This is merely obtained by book-wise folding up portion 22 of container 12 and together handle 54 of screen 46 against portion 20 and introducing tongue 26 into pocket 28.
  • package 10 takes the dimensions corresponding to those of the conventional packages and can be easily introduced into the oral cavity of the patient in correspondence with the dental region to be X-ray examined, with the frontal surface of portion 20 (i.e. relief 32) turned towards the X-ray source.
  • the X-ray radiations emitted by the source strike the fluorescent surface 50 of screen 46 and are converted into light rays which are reflected onto the emulsion 16 of film 14, thus exposing it.
  • This allows a drastic reduction in radiation exposure time, that is the X-ray quantity, yet assures a high definition and therefore a high quality X-ray image to be obtained at the same time (according to the film type used).
  • package 10 is removed from the oral cavity of the patient and again re-adapted according to the shape illustrated in figures 3 and 5 by releasing tongue 26 from pocket 28, this to allow the intensifying screen 46 to be removed from container 12 and to be used again.
  • process film 14 can be performed according to conventional techniques, after having removed film 14 in a dark room from container 12.
  • package 10 allows film 14 to be processed in full light by directly introducing, through orifice (24), the developing and fixing solutions into container 12 with the aid of special automatic equipments.
  • Introduction strip 34 can be advantageously used, at the end of the processing operations, to keep and file the obtained X-ray image.
  • the exposed X-ray film can be placed into frame 40 and held by means of holding parts 42, this rendering the examination thereof easier.
  • the reference which can be found on film 14 in this case should be turned towards reference 44 applied to appendage 38 of strip 34 such as to assure the orientation of film 14 according to the position in which the X-ray exposure has been made.
  • Such emulsion 16 is in fact effectively protected against possible light penetrations through opening 24 due both to the fact that it is placed in the lower portion formed by relief 32 and is therefore well-protected by introduction strip 34 or support 48 of screen 46 and to the fact that the internal black-opaque walls of container 12 prevent light reflections.
  • Figures from 7 to 14 show different variants which refer to various possibilities of the present invention to obtain more effective protective effects to X-ray film 14 during handling package 10.
  • relief 32 has been replaced with a thickening 62 obtained on the internal surface of frontal sheet 12a in correspondence with portion 22 of container 12.
  • relief 32 has been replaced with a lower portion 64 of frontal sheet 12a turned towards the inside of container 12 in correspondence with portion 22 thereof.
  • Figure 9 shows both relief 32 in correspondence with portion 20 and a lower portion 66 similar to 64 of figure 8 but having a step-wise shape.
  • relief 32 has been replaced with two adjacent depressions 68, 70 in correspondence with portion 22 of container 12 respectively obtained in frontal sheet 12a and in dorsal sheet 12b and turned towards the inside of container 12, so as to obtain a labirynth configuration.
  • relief 32 further contains a series of inclined and flexible tongues 72 jutting into the cavity of container 12, in correspondance with portion 22 thereof, from the internal surface of frontal sheet 12a.
  • tongues 72 could alternatively jut out from the internal surface of dorsal sheet 12b or still alternatively from both sheets 12a and 12b.
  • relief 32 has been replaced with a deformable relief or tongue 74 in the cavity of container 12 in correspondence with portion 22 thereof.
  • relief 74 of figure 12 has been replaced with a series of alternated depressions 76, 78 jutting into the cavity of container 12 in correspondance with portion 22 thereof and respectively obtained on the dorsal surface 12b and on the frontal surface 12a.
  • depressions 76 and 78 have been replaced with deformable alternated reliefs or teeth 80, 82 jutting into the cavity of container 12 in correspondence with portion 22 thereof respectively from frontal sheet 12a and dorsal sheet 12b.
  • Figures 15 and 16 show another possibility of the present invention to obtain more effective protective effects to x-ray film 14 during handling package 10.
  • connection region between portions 20 and 22 of the envelope 12 on the frontal sheet 12a is provided with a cross-mark 12c defining a folding line, the function of which will appear evident hereinafter.
  • a mark forms a relief 12d jutting out from the frontal sheet 12a and delimiting the housing of film 14.
  • the function of such relief is that of protecting additionally the x-ray film 14from possible light penetration into the container 12 through opening 24. It is worthwhile noticing however that, on the grounds of the experiments described hereinafter, relief 12d is optional and may be abolished.
  • the protection of film 14 from possible light penetration into the container 12 through opening 24 is obtained according to the invention mainly by including into the package a protecting strip 100 introduced in a releasable way into container 12 through opening 24, between the intensifying screen 46 and sheet 12b of container 12.
  • Such strip 100 normally is made of paper or similar material and has a width like that of the x-ray film 14 and a length higher than that of container 12, such as to form an appendix 102 jutting outside the opening 24. Appendix 102 can be folded against the external surface of sheet 12b of such container 12.
  • the surface of the protecting strip 100 turning towards the x-ray film 14 has an opaque coloration such as to absorb room-light, preferably a black opaque coloration.
  • the intensifying screen 46 is introduced into the package comprising the x-ray film 14, the insertion strip 34 and the protecting strip 100; in a second step before use, the insertion strip 34 is pulled out and in the third and last step, before exposure, portion 22 is folded on portion 20 of the envelope 12 and tongue 26 is introduced into pocket 28. In this way, the package is ready to be introduced into the patient's mouth, in correspondence with the dental region to be radiographed, with the frontal side of portion 20 turned towards the x-ray emitting source.
  • the x-rays emitted by the source strike the fluorescent surface 50 of the screen 46 and are converted into light rays which are reflected onto emulsion 16 of film 14, thus exposing it.
  • package 10 is removed from the patient's mouth and the envelope 12 is re-extended, as shown in figure 1, to take out the intensifying screen 46 and allow a further use thereof.
  • the protecting strip 100 effectively protects the x-ray film 14 against possible light penetration. through the opening 24 of the envelope 12.
  • sheets 12a and 12b could merely have two transverse depression lines turned towards the inside of container 12 near the ideal separation line between portions 20 and 22.
  • package 10 according to the present invention has a series of important advantages, which can be summarized as follows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Dental Preparations (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
EP19850900433 1983-12-22 1984-12-18 X-ray package for dental use Expired EP0165980B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5120883 1983-12-22
IT5120883U IT8351208V0 (it) 1983-12-22 1983-12-22 Confezione di pellicola radiografica per uso dentario

Publications (2)

Publication Number Publication Date
EP0165980A1 EP0165980A1 (en) 1986-01-02
EP0165980B1 true EP0165980B1 (en) 1988-01-20

Family

ID=11274628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900433 Expired EP0165980B1 (en) 1983-12-22 1984-12-18 X-ray package for dental use

Country Status (6)

Country Link
EP (1) EP0165980B1 (ja)
JP (1) JPH0682192B2 (ja)
AU (1) AU575615B2 (ja)
BR (1) BR8407238A (ja)
IT (1) IT8351208V0 (ja)
WO (1) WO1985002918A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4613984A (en) * 1984-11-07 1986-09-23 E. I. Du Pont De Nemours And Company Quick film release x-ray cassette mechanism
US4912740A (en) * 1988-08-19 1990-03-27 Eastman Kodak Company Intraoral dental radiographic film packet improvement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2590892A (en) * 1950-08-03 1952-04-01 Frederic W Reuter X-ray film exposure holder
FR1451258A (fr) * 1965-02-23 1966-01-07 Agfa Ag Emballage de film pour la réalisation de prises de vues à l'aide de rayons x ou de rayons gamma
DE3037483A1 (de) * 1980-10-03 1982-05-06 Siemens AG, 1000 Berlin und 8000 München Roentgenfilmpachung

Also Published As

Publication number Publication date
AU3748385A (en) 1985-07-12
BR8407238A (pt) 1985-11-26
WO1985002918A1 (en) 1985-07-04
JPH0682192B2 (ja) 1994-10-19
IT8351208V0 (it) 1983-12-22
JPS61500814A (ja) 1986-04-24
AU575615B2 (en) 1988-08-04
EP0165980A1 (en) 1986-01-02

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