Patent ID: 11911233
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A  B | IPC A

Claim 0:
1. An instrument for rotatably driving a screw or drill bit into bone in surgery, comprising
a. a drive shaft having a rotational power source at a proximal end for applying a rotational force to the drive shaft and a gear housing at a distal end of the drive shaft;
b. wherein the distal end of the drive shaft is connected to a first bevel gear supported in the gear housing, such that a larger diameter of the first bevel gear is in a proximal orientation, such that rotation of the drive shaft causes the first bevel gear to rotate;
c. wherein the first bevel gear meshes with a second bevel gear having an axis of rotation at a 25°-55° angle to direct a torque from the second bevel gear at the 25°-55° angle along a first internal shaft, wherein the first internal shaft terminates at a first spur gear;
d. wherein the first spur gear meshes with a second spur gear, wherein the second spur gear drives a second internal shaft that is coupled to a head that rotatably drives a surgical screw or drill at a 115°-145° angle from the drive shaft.