Three-dimensional guide for wire for forming pedicle screw insertion hole and method of producing the same

Abstract

A three-dimensional guide for a wire for forming a pedicle screw insertion hole is produced based on a CT image of a spine, and includes a contact surface section that comes in surface contact with a morphological surface of a bone at an insertion site, and a guide block section that is provided upright from the contact surface section. The guide block section has a guide hole that restricts the insertion direction of the wire. The guide hole has an inner diameter slightly larger than the outer diameter of the wire. The guide hole has a length of 15 to 30 mm to restrict the insertion position and the insertion direction of the wire.

What is claimed is: 
     
         1 . A three-dimensional guide for a wire for forming a pedicle screw insertion hole that is produced based on a CT image of a spine, the three-dimensional guide comprising:
 a contact surface section that comes in surface contact with a morphological surface of a bone at an insertion site; and   a guide block section that is provided upright from the contact surface section,   the guide block section having a guide hole for the wire, and   the guide hole having an inner diameter slightly larger than an outer diameter of the wire, and having a length of 15 to 30 mm to restrict an insertion position and an insertion direction of the wire.   
     
     
         2 . The three-dimensional guide as defined in  claim 1 ,
 the contact surface section including a morphological surface section that is formed by a gradual irregular curved surface that corresponds to the morphological surface of the bone at the insertion site, and a process contact section that is formed by a steep slope and comes in contact with a process of a vertebral arch.   
     
     
         3 . A method of producing a three-dimensional guide for a wire for forming a pedicle screw insertion hole, the method comprising:
 extracting a pedicle screw insertion site based on a CT image of a spine;   producing a mold based on the extracted pedicle screw insertion site; and   molding the three-dimensional guide in the mold, the three-dimensional guide including a contact surface section that comes in surface contact with a morphological surface of a bone at the insertion site, and a guide block section that has a guide hole for restricting an insertion position and an insertion direction of the wire.   
     
     
         4 . The method as defined in  claim 3 ,
 the molding of the three-dimensional guide including molding the contact surface section in the mold so that the contact surface section includes a morphological surface section that is formed by a gradual irregular curved surface that corresponds to the morphological surface of the bone at the insertion site, and a process contact section that is formed by a steep slope and comes in contact with a process of a vertebral arch.