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COMPACT ROTATION MECHANISM FOR PATIENT POSITIONING TABLE IN MEDICAL IMAGING

IP.com Disclosure Number: IPCOM000117360D
Publication Date: 2005-Mar-31
Document File: 6 page(s) / 85K

Publishing Venue

The IP.com Prior Art Database

Abstract

In an embodiment, a compact rotation mechanism for patient positioning table in medical imaging includes a cross (x) roller bearing, which is compact and capable of taking heavy axial and radial load, is mounted on a base. A bull gear, which is a stationary component, is mounted on to the outer race of the x roller bearing. Top plate and rotating ring that are the rotating elements of the system are mounted on to the inner race of the x-roller bearing. A pinion meshes positively with the bull gear. This pinion is mounted on the output of the geared BLDC motor, which in turn is mounted on the top plate. This BLDC geared motor encompasses an inbuilt incremental encoder for velocity monitoring. On the other end of the motor, a safety brake is mounted. Coupled to this brake is an absolute encoder for position monitoring. The position of pinion is designed such as to achieve the required rotational stroke about the center of the table.

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COMPACT ROTATION MECHANISM FOR PATIENT POSITIONING TABLE IN MEDICAL IMAGING

FIELD OF THE INVENTION

[0001]               This invention relates generally, to rotation mechanisms and more particularly to, a compact rotation mechanism for patient positioning table in medical imaging.

BACKGROUND OF THE INVENTION

[0002]                In a patient positioning table, especially for vascular imaging, the rotational drive needs to be configured compact in dimension and with a footprint, which is as minimal as possible so that it occupies minimal space and does not obstruct the doctor while conducting medical procedures.  The rotational axis has to be rigid enough to carry the moment and the loads due to patient and the accessories on the patient table.  The rotational axis motion should not have any shock or jerk during motion, which is critical towards patient comfort.  Any uncontrolled motion during the Rotational axis motorized motion should not injure the patients /operators or cause damage to the systems around the patient table (Gantry etc.).  Ease of usage for the user (doctor) and positioning depending upon the medical procedure.  There should be easy accessibility of the patient during loading and unloading and should not obstruct any of the other systems.

BRIEF DESCRIPTION OF THE DRAWINGS

[0003]                 FIG. 1 and FIG. 2 show a compact rotation mechanism according to one embodiment of this invention. 

DETAILED DESCRIPTION OF THE INVENTION

[0004]    Various embodiments of this invention provide a compact rotation mechanism for patient positioning table in medical imaging.  An example of medical imaging application includes vascular imaging. 

[0005]                 FIG. 1 and FIG. 2 show a compact rotation mechanism according to one embodiment of this invention.  The components, which constitute a motorized rotational axis System, are as described below.  

[0006]                In an embodiment, a cross (x) roller bearing, which is compact and capable of taking heavy axial and radial load, is mounted on a base.  A bull gear, which is a stationary component, is mounted on to the outer race of the x roller bearing.  Top plate and rotating ring that are the rotating elements of the system, are mounted on to the inner race of the x-roller bearing.  A pinion meshes positively with the bull gear.  This pinion is mounted on the output of the geared BLDC motor, which in turn is mounted on the top plate. This BLDC geared motor encompasses an inbuilt incremental encoder for velocity monitoring. On the other end of the motor, a safety brake is mounted.  Coupled to this brake is an absolute encoder for position monitoring.  The position of pinion is designed such as to achieve the required rotational stroke about the center of the table.

[0007]                In a further embodiment, a power-off failsafe electromagnetic brake mounted on the geared motor is positioned such a way it is directly on the load side and clamps positively on to the bull gear thru the motor shaft ensuring the position accuracy of...