X-RAY DEVICE WITH A STAND

• US 3,784,837 A
• Filed: 05/08/1972
• Issued: 01/08/1974
• Est. Priority Date: 05/08/1972
• Status: Expired due to Term

• Current Assignee: Lars Olof Holmstrom
• Original Assignee: Lars Olof Holmstrom
• Inventors: Holmstrom, Lars Olof
• Primary Examiner(s): Lawrence, James W.
• Assistant Examiner(s): Anderson, B. C.
• Application Number:
  US05/251,376
• Time in Patent Office: 610 Days
• Field of Search: 250/91,92,61.5,525
• US Class Current: 378/189
• CPC Class Codes: A61B 6/4441 the rigid structure being a C-arm or U-arm
• CPC Class Codes: A61B 6/4452 the source unit and the detector unit being able to move relative to each other
• CPC Class Codes: A61B 6/4464 the source unit or the detector unit being mounted to ceiling

Abstract

An X-ray device has a stand and an X-ray tube mounted upon a bracket which is supported rotatably about a support axis extending perpendicularly to its longitudinal axis. The invention is particularly characterized in that a carrying arm is rotatably mounted upon the free end of the bracket and that the X-ray tube is mounted upon the free end of this arm for rotation about further axes extending parallel to the support axis of the bracket. Driving means are provided which keep constant in space and independently from the swinging location of the bracket the position of the carrying arm relatively to the X-ray tube, whereby the central ray of the X-ray tube is always maintained parallel to the longitudinal axis of the bracket.

Claims

1. An X-ray device, comprising a bracket, a stand, an axle carried by said stand and rotatably supporting said bracket, a carrying arm, an axle extending parallel to the first-mentioned axle and supporting one end of said arm upon one end of said bracket, a third axle carried by the other end of said arm and extending parallel to the first- and second-mentioned axles, an X-ray tube carried by said third axle, driving means connected with said axles for maintaining constant the location of said arm and always directing the central ray of the X-ray tube parallel to the longitudinal direction of said bracket, an axle rotatably supporting said stand and extending perpendicularly to the firstmentioned axle, the axis of the last-mentioned axle extending through the common intersection point of the central rays of the X-ray tube in all positions of said bracket, said third axle having an axis extending through the focal point of said X-ray tube, wherein said means comprise two chain wheels and an endless chain enclosing said chain wheels, said chain wheels being mounted upon the second and third-mentioned axles on opposite ends of said arm, one of said chain wheels being coupled with said bracket, the other one of said chain wheels beIng coupled with said X-ray tube, whereby the longitudinal axis of said bracket is maintained parallel to the central ray of X-ray tube, the first-mentioned axle extending horizontally, said means maintaining said arm in a vertical position.

2. An X-ray device according to claim 1, wherein said bracket is a two-arm lever, the device further comprising a second carrying arm, a fourth axle extending parallel to the first-mentioned axle and supporting one end of the second arm upon the opposite end of said bracket, the two axles being equally spaced, a fifth axle carried by the other end of the second arm and extending parallel to said axles, an X-ray image amplifier carried by said fifth axle, said means being connected with said fourth and fifth axles and maintaining said second arm independently of the location of said braceet parallel to the first-mentioned arm and always directing the optical axis of said X-ray image amplifier to the central ray of the X-ray tube, wherein said means comprise two chain wheels and an endless chain enclosing said chain wheels, one of said chain wheels being coupled with said stand, the other one of said chain wheels being coupled with said arm, whereby the location of said arm relatively to the first-mentioned and second-mentioned axles is maintained constant, said chain wheels being mounted upon the fourth-and fifth-mentioned axles on opposite ends of said second arm, one of said chain wheels being coupled with said X-ray image amplifier, whereby said bracket is maintained parallel to the optical axis of said X-ray image amplifier.