The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 1990
Filed:
Mar. 15, 1988
Francis J Span, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A patient support system for irradiation therapy or treatment simulation comprises a main arm 1 on a sub-floor mounted pivot 10 about a first vertical axis 17, which supports a further arm 49 rotatable about a second vertical axis 16. At the other end of the arm 49 a vertical pillar 4, pivotable about a third vertical axis 15, supports a vertically displaceable carriage 3 on which a patient support table top 2 is directly mounted. A control system is described which enables x, y coordinate command values to control respective drives associated with the three vertical axes to position a patient quickly and accurately relative to the treatment isocentre. This takes the form of a cartesian error nulling arrangement in which the actual coordinates Xa(act), Ya(act) are computed (143) from angular measurements phi1, phi2 (116A, 104A) about axes 17 and 16, cartesian error signals EX, EY are formed by subtraction (146,147), and angular error signals Ephi1, Ephi2 are derived therefrom to actuate the respective motor drives (131, 132), phi3 being derived from phi1 and phi2 to maintain a steady direction for the table top 2. The system requires only a shallow well while providing a large range of vertical life. Furthermore, no sub-table x-y carriage is required increasing patient accessability.