Patent GB-1186859-A (GB)
Title: Extension Device
Inventor: PILZ EDWIN
IPC: A61B6/00
Filed: 1967-03-08
Abstract: 1,186,859. Treatment of fractures; traction apparatus. STIERLEN-WERKE A.G. 8 March, 1967, No. 10999/67. Heading A5R. An extension device, for example an operating table or other means of support for use for example in the treatment of fractures, comprises at least two extension bars by means of which traction may be applied to the limbs and trunk of a patient supported on or by the device, at least one of the extension bars consisting of at least two sections joined together through an articulated joint which allows relative pivotal movement of the sections in a horizontal plane and which also can be locked, for example by means of cooperating radial serrations, to prevent such movement. The extension bars preferably are pivotally mounted, for example on a common axis, for movement in a horizontal plane and are lockable in position, for example also by means of co-operating radial serrations, to prevent such movement. Figures 1 and 2 illustrate an extension device which comprises a foot 1 carrying a column 2 which is telescopically adjustable in height and which carries a chassis 3. The chassis, which is pivotable in a vertical plane, carries a patient-supporting surface which comprises thorax plate 6 and pelvis plate 7 carried on respective vertically adjustable support columns 4 and 5. A screw-threaded rod 10 extends through the chassis and into a correspondingly screwthreaded portion of a tongue-shaped pelvis support 8 upon which is mounted, coaxially with the rod, a countertraction post 9 which projects above the level of the patient-supporting surface. Coaxially mounted on the rod for rotation thereabout are two extension bars, each bar having three sections. One end of the first section 11 or 21 of each bar is mounted on the rod by hub portion 16 or 26, the other end being connected by articulated joint 14 or 24 to one end of the intermediate section 12 or 22, the other end of which section is connected by articulated joint 15 or 25 to one end of the final section 13 or 23, the other end of which section carries a screw-tension device 17 or 27 which is adjustable in height and which can rotate about its vertical axis. In order to enable each extension bar and the articulated joints thereof to be locked in a desired position, co-operating radial serrations are provided on the opposed surfaces of the chassis, the pelvis support and the hub portion of the first section of each bar, and also on the opposed surfaces of the joints connecting the intermediate section of each bar to the first and final sections of each bar. In order to provide freedom of movement, in the horizontal place, of one bar relative to the other bar, it is preferred that the first section of a first bar is shorter, by a distance at least equal to the diameter of an articulated joint, than the first section of the second bar and the final section of the second bar is shorter, by the same amount, than the final section of the first bar. At least one bar may include an intermediate section which is removable therefrom. The extension device is of particular use when associated with X-ray apparatus, see Figures 4 and 5 (not shown).