Horizontally supported planar surfaces – Power driven – Along circuitous path
Patent
1988-03-15
1990-05-15
Chen, Jose V.
Horizontally supported planar surfaces
Power driven
Along circuitous path
378209, 248122, A47B 8500
Patent
active
049247816
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.
REFERENCES:
patent: 2906143 (1959-09-01), Musser
patent: 3306134 (1967-02-01), Winiarski
patent: 3627250 (1971-12-01), Pegrum
patent: 4131802 (1978-12-01), Braden et al.
patent: 4481657 (1984-11-01), Larsson
patent: 4609940 (1986-09-01), Born et al.
Briody Thomas A.
Chen José V.
Haken Jack E.
Squire William
U.S. Philips Corporation
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