Patent ID: 7491209

Claim:
A variable locking instrument guide comprising: a) a variable cannula having a proximal end and a distal end and having a partially spheroidal ball section having a spheroidal center at said distal end; b) a draw rod having a proximal end and a distal end, said proximal end further comprising an enlarged head and said distal end further comprising a threaded portion; c) a draw rod cannula for receiving said draw rod therethrough, wherein said draw rod cannula comprises a proximal end and a distal end; d) an engaging device base further comprising a top portion and a bottom portion connected at a fixed support defining a gap therebetween, said engaging device base further comprising a first through-hole through said top portion and said bottom section for receiving a drill cannula bushing, said drill cannula bushing receiving therewithin said partially spheroidal ball section of said variable cannula, and said engaging device base further comprising a second through-hole through said top portion for receiving said distal end of said draw rod cannula, and a second threaded through-hole through said bottom portion that is coaxial with said second through-hole in said top portion, for threadedly receiving said threaded portion of said draw rod; e) wherein in a first condition said variable cannula is rotatable about said spheroidal center; and f) in a second condition said draw rod engages said second threaded through-hole through said bottom portion releasably locking said variable cannula in a predetermined orientation about said spheroidal center.