Tower tool for minimally invasive surgery

Abstract

A rod reduction tool assembly includes an outer tube with outer tangs for engaging a bone anchor, an inner partially tubular pin support and a threaded cap mated to the outer tube and engaging the inner pin support.

1 - 8 . (canceled) 
     
     
         9 . In a combination of a bone attachment structure having a receiver and a medical implant holding tool having receiver attachment structure at a lower end thereof operably mateable with the receiver; the improvement wherein:
 a) the receiver has two arms, each arm having an undercut first surface projecting downwardly toward a bottom thereof and a curved surface located directly above the undercut surface; and   b) the tool has an outer portion, an inner portion slidably received within the outer portion and a cap, the outer portion having structure in engagement with the receiver undercut surface, the inner portion having a pair of opposed pins, each pin extending through an aperture of the outer portion, the cap threadably connected to the outer portion and in abutment with the inner portion, and wherein rotation of the cap with respect to the outer portion causes the cap to press against and move the inner portion in a downward direction toward the receiver and thereby move the pair of opposed pins into engagement with the receiver arm curved surfaces.   
     
     
         10 . The improvement of  claim 9 , wherein each receiver arm has an inner surface located directly above a dual start guide and advancement structure and wherein the tool engages the inner surface. 
     
     
         11 . The improvement of  claim 9 , wherein the tool is rotatable on and off of the receiver in both a clockwise and a counterclockwise manner. 
     
     
         12 . (canceled) 
     
     
         13 . In a combination of a bone attachment structure having a receiver and a medical implant holding tool having receiver attachment structure at a lower end thereof operably mateable with the receiver; the improvement wherein:
 a) the receiver has two arms, each arm having an outer circumferential groove with a first surface projecting downwardly toward a bottom thereof; and   b) the tool has an outer portion, an inner portion slidably received within the outer portion and a cap, the outer portion having structure in engagement with the receiver grooves, the inner portion having a pair of opposed pins, each pin extending through an aperture of the outer portion, the cap threadably connected to the outer portion and in abutment with the inner portion, and wherein rotation of the cap with respect to the outer portion causes the cap to press against and move the inner portion in a downward direction toward the receiver and thereby move the pair of opposed pins into engagement with the receiver arm curved surfaces.