Patent Number: 055330894
Section: claims

1. An instrument comprising a unit having a central aperture, and manually operable rack means supporting said unit for locating the aperture of the unit between a subject and a radiological source, said unit being positionable proximal to the subject and independent of said source for the purpose of exposing a desired area of the subject to radiological exposure while shielding its surrounding areas, and wherein radio-opaque shutters hinged to the unit are manipulative to obtain adjustments in the size, shape and perimeter of said aperture for radiological exposure of the desired area of the subject, wherein the unit has a multisided frame defining the aperture, and the radio-opaque shutters are hinged to sides of the frame, wherein the shutters are flexible, and wherein an x-ray photographic film is disposed below the subject, translucent perforations are provided along the bottom sides of the shutters, which sides are opposite to and facing the hinged sides, and x-rays passing through the perforations and registered upon the film provide a scale indication of the size of the aperture. 2. An instrument comprising a unit having a central aperture, and manually operable rack means supporting said unit for locating the aperture of the unit between a subject and a radiological source, said unit being positionable proximal to the subject and independent of said source for the purpose of exposing a desired area of the subject to radiological exposure while shielding its surrounding areas, and wherein radio-opaque shutters hinged to the unit are manipulative to obtain adjustments in the size, shape and perimeter of said aperture for radiological exposure of the desired area of the subject, wherein the unit has a multisided frame defining the aperture, and the radio-opaque shutters are hinged to sides of the frame, wherein the shutters are flexible and wherein the frame of the unit is formed of rod. 3. An instrument as in claim 2, wherein the rod is cylindrical and the frame is rectangular in form. 4. An instrument as in claim 2, wherein the rod is tubular. 5. An instrument comprising a unit having a central aperture, and a manually operable rack supporting swivelly at one end thereof said unit for locating the aperture of the unit between a subject and a radiological source, said unit being positionable by means of said rack proximal to the subject and independent of said source for the purpose of exposing a desired area of the subject to radiological exposure while shielding its surrounding areas, wherein radio-opaque shutters hinged to the unit are manipulative to obtain adjustments in the size, shape and perimeter of a bottom end of the aperture for radiological exposure of the desired area of the subject, wherein the unit has a frame of continuous tubing defining the perimeter of the aperture, the radio-opaque shutters are hinged to and depend from the tubing of the frame, and wherein detent means engages the hinged shutters with the tubing. 6. An instrument comprising a unit having a frame continuous in in its form defining the perimeter about an aperture, an extendible rack having one end mountable to a support and having an opposite end with a universal joint connection to the frame allowing variable movement of the frame relative to the rack, wherein panels of radio-opaque material are hinged to and depend in a vertical plane from the frame about the aperture, the rack is manually extendible to position the unit with its aperture disposed below a source of x-rays and above a selected area of a patient's body, the panels are pivotably adjustable about the frame relative to one another to vary the size of a bottom outlet end of the aperture above the patient's body and to limit x-rays issuing from the source to the particular area of the patient's body, each panel is pivotable to a selected position about the frame, and each hinge has a pressured engagement with the frame, whereby the associated panel is retained under pressure in its pivoted position. 7. An instrument as in claim 6, wherein the frame in its form is a continuous tube defining the perimeter of the aperture. 8. An instrument as in claim 6, wherein the frame in its form is a continuous rod defining the perimeter of the aperture. 9. An instrument as in claim 6, wherein each hinge has a spring pressured detent engagement with the frame whereby the associated panel is retained under spring pressure in its pivoted position. 10. An instrument as in claim 6, wherein each hinge has a spring pressured engagement with the frame whereby the associated panel is retained under spring pressure in its pivoted position. 11. An instrument as in claim 6, wherein each hinge has a friction pressured engagement with the frame whereby the associated panel is retained under friction pressured engagement in its pivoted position.