an apparatus for supporting and facilitating accurate positioning , both linearly and angularly of a medical device such as an ultrasound probe , a medical instrument or an imaging device . the apparatus is capable of both gross and precise multi - directional movements with the medical device attached , while remaining connected to stationary objects such as a portable floor stand and / or operating table . after gross manual placement and approximate positioning , the fine tune mechanism of the attached medical device is locked in positioned and secured to two fixed points . exact positioning is then achieved by the precision movements which are available in all three linear directions and rotational axes . by this arrangement which allows preattachment of the medical device or instrument to the apparatus prior to positioning in the patient , quicker , more accurate and more reproducible medical device positioning and placement are achieved . in one preferred embodiment , the apparatus provides for multi - directional adjustment including a plurality of translational adjustments and one rotational adjustment .