Patent ID: 7909835

Claim:
An auxiliary instrument for fixing a rod, the auxiliary instrument placing a detent pin employed to fix the rod to a screw on a head portion of the screw, the auxiliary instrument comprising: an inner cylinder member having a plurality of claw portions at a first end portion thereof and an opening employed to introduce the detent pin into an interior thereof at a second end portion thereof, the inner cylinder member further having a first bracket disposed at the second end portion thereof such that the first bracket projects from the inner cylinder member in a direction generally perpendicular to a longitudinal axial direction of the inner cylinder member; an outer cylinder member arranged to surround the inner cylinder member and having a claw pressing portion at a first end portion thereof, the outer cylinder member further having a second bracket at a second end portion thereof such that the second bracket projects from the outer cylinder member in generally a same direction as the first bracket; a first lever rotatably connected to the first bracket of the inner cylinder member such that the first lever is extended from the first bracket; and a second lever rotatably connected to the first lever and the second bracket of the outer cylinder member such that the second lever is extended from the second bracket, wherein the claw portions are pressed inward by the claw pressing portion to hold the head portion of the screw when the first lever and the second lever are operated.