Patent ID: 8226406

Claim:
A positioning assist device for drilling multiple dental implant holes, comprising: a main arm unit, wherein the main arm unit has an arm body with a first end and a second end disposed as opposed to each other, and the first end has a reference shaft pivoted on the first end, wherein the first end of the main arm unit has an axis hole disposed therein vertically for allowing the reference shaft passing therethrough; a first position mechanism corresponding to the reference shaft; at least a first position indentation encircling the reference shaft at a height of the reference shaft, wherein the arm body has a first through hole passing to the axis hole, and the first position mechanism includes: a first fixing screw bolt for fixing into the first through hole; a first spring disposed on a side of the first fixing screw bolt toward the axis hole; and a first position bead disposed on a side of the first spring toward the axis hole, wherein the first position bead is elastically engaged with the first position indentation of the reference shaft; and an extension arm unit pivoted on the second end of the main arm unit via a connecting shaft, wherein the extension arm unit has a first connecting head, a pair of connecting rods, and a second connecting head all pivoted sequentially, a external end portion of the second connecting head has a drill-guiding portion disposed thereon, and the drill-guiding portion has a drill-guiding hole.