Device for fixation of bone fractures

A device for fixation of a bone fracture using ultrasonic energy, comprising

• a bone screw having a shank with a first threaded end and having along a longitudinal center line thereof an axial through bore having a first bore portion with a first diameter and a second bore portion with a second diameter, wherein the first diameter is larger than the second diameter and the second bore portion is adjacent the first threaded end, and a step is formed in the bore between the first and the second bore portions;
• a metal insert, and
• a polymer pin having a first end for insertion into the first bore portion of the bone screw, wherein the metal insert comprises a substantially disk-shaped first end dimensioned for resting on the step in the bore when the metal insert is inserted into the bone screw first bore portion and has a second end including a pin-shaped portion, and wherein the polymer pin first end has a counter bore configured to receive the second end pin-shaped portion on the metal insert with which it is connectable, for the transmission of ultrasonic energy from the metal insert to the first end of the polymeric pin.

A device for fixation of a bone fracture using ultrasonic energy, comprising

• a bone screw having a shank with a first threaded end and having along its longitudinal center line an axial through bore having a first bore portion with a first diameter and a second bore portion with a second diameter, wherein the first diameter is larger than the second diameter and the second bore portion is adjacent the first threaded end, and a step in the bore between the first and the second bore portions,
• a metal insert and
• a polymer pin for insertion into the bore of the bone screw, wherein the metal insert has a substantially disk-shaped first end and dimensioned so that it can rest on the step in the bore when the metal insert is inserted into the bore of the bone screw, the metal insert having a second end, and wherein a first end of the polymer pin has a recess having a bottom surface, the recess corresponding in diameter to the second end of the metal insert for receiving the same, the metal insert capable of transferring ultrasonic energy to the first end of the polymer pin.

A device for fixation of a bone fracture using ultrasonic energy, comprising

• a bone screw having a shank with a first threaded end and having along its longitudinal center line an axial through bore having a first bore portion with a first diameter and a second bore portion with a second diameter, wherein the first diameter is larger than the second diameter and the second bore portion is adjacent the first threaded end portion, and a step in the bore between the first and the second bore portions;
• a metal insert;
• and a polymer pin for insertion into the bore of the bone screw, wherein the metal insert has a substantially disk-shaped first end dimensioned so that the first end rests on the step in the bore when the metal insert is inserted into the bore in the bone screw, and the metal insert has an axially extending coupling element at a second end, and wherein a first end of the polymer pin is configured so that it can engage the axially extending coupling element at the second end of the metal insert along its axial extent for the transmission of ultrasonic energy from the metal insert to the first end of the polymer pin.