Frameless stereotactic arm apparatus and method of using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Mar 7, 2000
Grant Date -
N/A
app pub date -
Nov 28, 1997
filing date -
Nov 28, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An imaging apparatus (18) includes a frameless stereotactic arm apparatus (30) including a first base portion (42) mounted in a fixed relationship to the imaging device. A second free end (40) of the arm assembly is adapted to move into varied positions near a specimen disposed on the imaging apparatus. At least one pivot joint (44, 48, 52, 56, 60) is provided between the first base portion and the free end of the arm for permitting selective relevant movement between the arm members. Electro-mechanical and electro-magnetic brake devices are provided at respective joints to selectively lock the free end of the arm assembly to the base portion. The brakes are responsive to a brake command signal (210) generated by the imaging device. A low pass filter (240) conditions the brake command signal to substantially eliminate high frequency electromagnetic switching noise in the stereotactic arm. So that the arm is movable in emergency situations, the brakes are adapted to rebase in response to application of a force in excess of a predetermined breakaway threshold force.
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