Patent ID: 7877890

Claim:
A device assembly for detecting spatial position, said device assembly comprising: a mounting device having an extending arm; a tracker device for detecting a spatial position on a distal end of said extending arm; a sleeve member on a proximal end of said extending arm operably receiving a distal end of a shaft of a surgical instrument; said shaft having a coupling for engaging a working end of said surgical instrument; said sleeve member defining a bounded through opening extending along a longitudinal axis therethrough from a first side to a second side and penetrated by said shaft of surgical instrument along said longitudinal axis during an assembly of said device assembly, said longitudinal axis perpendicular to said extending arm; said sleeve including a plurality of wall openings extending away from said bounded through opening in said sleeve, thereby permitting an external access to said bounded through opening and an interior space therein and said distal end of said shaft following said assembly; said bounded through opening of said sleeve member having a first diameter; said distal end of said shaft having a stop member having a second diameter greater than said first diameter and a threaded portion having a third diameter less than said first diameter, thereby permitting said assembly between said sleeve member and said shaft; a first angular ball bearing bounding said distal end of said shaft and spacing said first side of said sleeve member and said stop member of said shaft; a second angular ball bearing at said distal end of said shaft proximate said extended threaded portion and said second side of said sleeve member; a nut member having an outer nut-diameter greater than said first diameter of said bounded through opening of said sleeve and threadably engaging said threaded portion of said distal end of said shaft during said assembly; and said second angular ball bearing between said nut member and said second side of said sleeve member, whereby during said assembly an operation of said nut member provides an urging force on said mounting device against said stop member enabling both a rotation and an immobilization of said mounting member relative to both an axial and a radial direction.