X-ray sheet film cassette for application to angular body parts

Abstract

An X-ray sheet film cassette is assembled of a bottom wall, side walls and a cover hinged to an upper part of one side wall. The lower part of the one side wall adjoining the bottom wall is reduced in thickness to form an abutment for the sheet film. The inner surface of the cover is provided with a resilient pressing pad which during the closing of the cover urges the sheet film against the abutment and in the closed condition of the cassette presses the film against the bottom. In this manner, when taking X-ray pictures of a part of patient's body which forms an angle relative to another body part, the unexposed section of the first mentioned body part which is adjacent the other body part, is minimized and well defined in position relative to the other body part.

I claim: 
     
       1. An X-ray sheet film cassette for taking pictures of a part of patient's body which forms an angle with another body part, comprising a receptacle in the form of a flat quadrangular prism for receiving an X-ray sheet film, the receptacle having a bottom wall, side walls and a cover: said bottom wall supporting said sheet film on its inner surface while its outer surface being engageable with the part of the patient's body; one of said side walls being reduced in thickness relative to the remaining walls and having a flat outer surface engageable with the other part of patient's body; a hinge mount .Iadd.having a first portion .Iaddend.secured to upper part of said one side wall .[.and.]. .Iadd., a second portion secured .Iaddend.to an edge of said cover .Iadd.and a third portion disposed between said first and second portions, permitting hinged movement therebetween .Iaddend.to turn the cover between an open and a closed position, said .[.hinge.]. .Iadd.first portion of said hinge mount .Iaddend.projecting above the inner surface of a lower part of said one side wall; a resilient pressure means arranged on the inner surface of said cover and having a leading edge portion engaging, during the turning movement of said cover.Iadd., .Iaddend.said sheet film and.Iadd., if said sheet film is not in contact with said one side wall, .Iaddend.displacing the same into abutment against said lower part of said one side wall and, in the closed position of said cover, said pressure means holding said sheet film on said bottom wall .Iadd.and keeping said sheet film in a correct position in contact with said one side wall; said pressure means being extended in length toward said one side wall to project under said first portion of said hinge mount in the closed condition of the cassette. .Iaddend. 
     
     
       2. An X-ray sheet film cassette as defined in claim 1 wherein the thickness of the lower part of said one side wall is at most 1 mm. 
     
     
       3. An X-ray sheet film cassette as defined in claim 1 wherein said hinge is flush with said flat outer surface of said one side wall. 
     
     
       4. An X-ray sheet film cassette as defined in claim 1 wherein said resilient pressure means includes projections formed on the inner surface of the cover, a plate of a plastic material secured to said projections, a rubber foam plate secured to the thin plate, .[.a reinforcing foil.]. .Iadd.and intensifying screen .Iaddend.secured to the foam rubber plate; and at least the .[.reinforcing foil.]. .Iadd.intensifying screen .Iaddend.length to project in the closed condition of the cassette, under said hinge mount. 
     
     
       5. An X-ray sheet film cassette as defined in claim 4 wherein the hinge mount is in the form of a folded strip of synthetic material, the end portions of the strip on opposite sides of the fold being provided with curved grooves, and the corresponding end portions of the cover and of said one side wall having complementary projections snugly fitting into said curved grooves. 
     
     
       6. An X-ray sheet film cassette as defined in claim 4 wherein the hinge mount is in the form of a folded band of synthetic material engaging corresponding recesses in the outer surface of said one side wall an said cover, the band being secured in the recesses by gluing. 
     
     
       7. An X-ray sheet film cassette as defined in claim 4 wherein the hinge mount is assembled of linkage hinge members secured to the inner surfaces of said one side wall and of said cover, and further including a screening strip arranged along the hinge member on said one side wall, and screening strip in the closed condition of the cassette engaging the extended part of said pressure means. 
     
     
       8. An X-ray sheet film cassette as defined in claim 7 wherein said hinge members are rounded and the adjoining edges of said one side wall of said cover matching the rounding of said hinge member and tangentially transiting to the rounding.