Granted Patent B2

US 8,353,910 · App. 12/294,567 · Granted Jan 15, 2013

Abstract

Claims (57)

1. An intramedullary osteosynthetic device comprising:

an intramedullary nail;

a hip helical implant;

a sliding sleeve;

a lateral set screw; and

at least one distal locking screw;

wherein the hip helical implant has an external flat corresponding to an internal flat in the sliding sleeve; and

wherein the hip helical implant comprises:

a frontal helical portion having a truncated conical shape;

at least two helical twisted blades attached to the frontal helical portion; and

a rear smooth shaft, the shaft having the external flat,

wherein each blade has a hole for receiving a peg from a step for fixating the hip helical implant to the step helix, and

the hip helical implant is cannulated to receive a Kirschner wire.

2. An intramedullary osteosynthetic device according to claim 1 , wherein:

the intramedullary nail is cannulated, the cannulation is at least partially threaded to receive a coaxial set screw,

the intramedullary nail includes at least one oblique slotted bore in communication with the cannulation, the at least one oblique slotted bore receiving the sliding sleeve, and

the intramedullary nail includes a threaded notch compatible with the lateral set screw.

3. An intramedullary osteosynthetic device according to claim 2 , wherein the sliding sleeve comprises a tube having the internal flat and has external threads at a rear of the sliding sleeve engaging the lateral set screw.

4. An intramedullary osteosynthetic device according to claim 2 , wherein the coaxial set screw fixes the sliding sleeve to the intramedullary nail by tightening the sliding sleeve inside the oblique slotted bore.

5. An intramedullary osteosynthetic device according to claim 1 , wherein:

the step helix consists of at least two helical twisted step blades attached to a slotted base, and

wherein the slotted base has a frontal peg fitting into a notch located on the shaft of the hip helical implant.

6. An insertion tool for inserting a hip helical implant having a shaft, comprising:

a cannulated shaft having a rotating handle;

an axial insert; and

a rear cap,

wherein the cannulated shaft at a front end has a slot engaging a slot on a base of a step helix,

wherein the rotating handle is assembled over the cannulated shaft, and

a rear portion of the cannulated shaft has a nose that can be hammered to remove the insertion tool after the hip helical implant has been inserted;

wherein the step helix has at least two helical twisted step blades attached to a slotted base, and wherein the slotted base has a frontal peg fitting into a notch located on the shaft of the hip helical implant.

7. An insertion tool for inserting the a hip helical implant according to claim 6 , wherein the axial insert having a lesser diameter than the cannulated shaft so as to slidably pass through the cannulation of the shaft and having an externally threaded front end engages an internal thread of a shaft of the hip helical implant firmly attaching the insertion tool to the hip helical implant.

8. An insertion tool for inserting the a hip helical implant according to claim 6 , wherein the insertion tool, step helix and hip helical implant are assembled prior to insertion.

9. An assembly according to claim 8 , wherein assembly of the insertion tool, step helix and hip helical implant comprises:

firmly attaching the step helix to a rear portion of the hip helical implant, such that pegs on the step helix are inserted into holes located on blades of the hip helical implant;

the cannulated shaft of the insertion tool engages the base of the step helix by a slotted mechanism;

the axial insert passes through a cannulation of the base of the step helix and into an internally threaded hole of the shaft of the hip helical implant, wherein the axial insert is threaded into the hip helical implant; and

the rear cap of the insertion tool is attached to a threaded rear end of the axial insert.

10. A method of inserting a hip helical implant into a femoral head, comprises the steps of:

introducing an intramedullary nail into a femoral medullary canal;

attaching a hip helical implant via a step helix and axial insert to an insertion tool, the hip helical implant having an external flat corresponding to an internal flat in a sliding sleeve, a lateral set screw affixing the sliding sleeve to the intramedullary nail being parallel but not coaxial to the sliding sleeve;

inserting the hip helical implant through an oblique bore of the intramedullary nail, wherein blades of the hip helical implant pass through slots in the intramedullary nail, wherein blades of the step helix pass through the slots of the intramedullary nail in a same direction as the hip helical implant until hip helical implant reaches a final position inside the femoral head; and

after insertion of the hip helical implant the step helix and insertion tool are removed.

11. A method of inserting a hip helical implant into a femoral head according to claim 10 , wherein removal of the step helix and insertion tool includes the steps of:

removing a rear cap of the insertion tool;

hammering a nose on a shaft of the insertion tool causing the step helix and insertion tool to disengage from the axial insert and hip helical implant; and

unscrewing the axial insert from the hip helical implant, leaving only the hip helical implant in the femoral head with a shaft of the hip helical implant passing through the oblique bore of the intramedullary nail.

12. A method of inserting a hip helical implant into a femoral head according to claim 10 , wherein the hip helical implant comprises:

a frontal helical portion having a truncated conical shape;

at least two helical twisted blades attached to the frontal helical portion; and

a rear smooth shaft, the shaft having the external flat surface,

wherein each blade has a hole for receiving a peg from a step helix fixating the hip helical implant to the step helix, and

the hip helical implant is cannulated to receive a Kirschner wire.

13. A method of inserting a hip helical implant into a femoral head according to claim 10 , wherein:

the intramedullary nail is cannulated, the cannulation is at least partially threaded to receive a coaxial set screw,

the oblique slotted bore is in communication with the cannulation, the oblique slotted bore receiving the sliding sleeve, and

the intramedullary nail includes a threaded notch compatible with the lateral set screw.

14. A method of inserting a hip helical implant into a femoral head according to claim 10 , wherein the sliding sleeve comprises a tube having the internal flat corresponding to the external flat of the hip helical implant and has external threads at the rear of the sleeve engaging the lateral set screw.

Assignments (6)