Jig for guide pin piercing
A guide pin piercing jig includes a cylinder unit and a frame having a positioning projection at a tip thereof, in which the cylinder unit has plural parallel guide pin insertion cylinders and tentative fixing unit and is attached to the frame slidably so as to be directed to the tip of the frame. It becomes possible to pierce living body bone with plural guide pins for hollow drills to a proper portion of a living body bone in a proper direction with parallel arrangement to form a bone tunnel that has a rectangular or elliptical opening and is suitable for tendon transplantation.
1. A guide pin piercing jig for piercing a living body bone with guide pins for boring hollow drills in such a manner as to determine positions and a direction of the guide pins, the guide pin piercing jig comprising:
a frame having a positioning projection at a tip thereof;
a bore aiming portion at a vicinity of the positioning projection; and
a cylinder unit,
wherein the cylinder unit is configured to integrate a plurality of parallel guide pin insertion cylinders with each other and has a tentative fixing unit at a tip of the cylinder unit and is attached to the frame slidably so as to be directed to the tip of the frame,
wherein the tip of the cylinder unit is inclined from a center line thereof by 30° to 80° so that one of the guide pin insertion cylinders that is located closer to the frame is longer than another of the guide pin insertion cylinders that is located farther away from the frame, and
wherein the bore aiming portion has a through hole through which axial center lines of the plurality of parallel guide pin insertion cylinders pass.
2. The guide pin piercing jig according to claim 1 , wherein an angle at which a center line of an inside surface of a tip arm of the frame and center lines of the guide pin insertion cylinders cross each other is in a range of 60° to 90°.
3. The guide pin piercing jig according to claim 1 , wherein a surface, to be brought into contact with a living body bone, of the boring aiming portion is inclined from a center line of an inside surface of a tip arm of the frame by 5° to 30°.
4. The guide pin piercing jig according to claim 1 , wherein the cylinder unit is detachable from the frame.
5. The guide pin piercing jig according to claim 1 , wherein a length of a tip arm of the frame is in a range of 10 to 50 mm.
6. The guide pin piercing jig according to claim 1 , wherein the frame has a bent portion, which is located at a position that is distant from the tip of the frame by 10 to 50 mm and bent at 30° to 80°, and a tip arm, which extends straightly from the bent portion to the tip of the frame.