Pneumoencephalography chair
AssigneeNorth American Philips Corporation
InventorPieter Willem Kok
Life of this patent
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Abstract
Chair apparatus specially adapted for detachable mounting on a tiltable tomography table to restrain and support a patient and his head for tomographic exposures during pneumoencephalography. The chair apparatus positions the patient's head close to the tomography table and permits multiaxial rotation of the patient about his head so that a defined isocenter in the patient's brain does not move with respect to the table. Two axes of rotation intersect the geometric center of tomographic study.
Claims11
Apparatus for supporting a patient for tomography exposures during pneumoencephalography, comprising:
- annular bearing means having a first bearing portion detachably mountable on the surface of a tiltable tomography table, said annular bearing having a central aperture sufficiently larger than a patient's head so that said bearing does not interfere with tomography of a patient's head positioned on the axis of said bearing;
- chair means for receiving and supporting a patient substantially immobile within a space defined by an imaginary cone of predetermined size, the patient's head being toward the apex of said cone with the isocenter of the patient's head lying on the axis of said cone;
- shaft means supporting said chair means for rotating a patient about the axis of said cone;
- means for adjusting the position of said chair means along the axis of said cone for positioning the isocenter of the patient's head at a predetermined point along the axis of said cone;
- and
- means entirely supported by a second bearing portion for supporting said shaft means in a position such that a central ray extends through the isocenter which is the intersection of the axis of rotation of the annular bearing which is perpendicular to the table, the axis of the cone, and the horizontal tomographic rotation axis of a rod-like parallelogram extending through the isocenter.
Apparatus for supporting a patient for tomography exposures during pneumoecephalography comprising:
- annular bearing means having a first bearing portion detachably mountable on the surface of a tiltable tomography table in a position such that the axis of rotation of a second bearing portion thereof always coincides with the central ray during tomography, said annular bearing having a central aperture sufficiently larger than a patient's head so that said bearing does not interfere with tomography of a patient's head positioned on the axis of said bearing;
- chair means entirely supported by said second bearing portion for receiving and supporting a patient substantially immobile in a position such that a predetermined point within the patient's head lies on the axis of rotation of the second bearing portion, said axis being a first axis of rotation of said chair means;
- said chair means having a second axis of rotation which obliquely intersects said first axis of rotation at said predetermined point;
- said predetermined point thereby forming an isocenter in the patient's head which remains at the same point in the central ray during any rotation of said chair means and patient about said first and second axes of rotation.
Dependencies are inferred from the claim text.