Minimal Invasive Hip Arthroplasty Device

• US 20110264233A1
• Filed: 04/22/2010
• Published: 10/27/2011
• Est. Priority Date: 04/22/2010
• Status: Active Grant

• Current Assignee: Benjamin S. Song, Omnes Medical, Inc.
• Original Assignee: Angela Y. Song, Benjamin S. Song, Jennifer J. Song, Michael A. Song
• Inventors: SONG, Benjamin Soo-il
• Granted Patent: US 8,840,675 B2
• Time in Patent Office: Days
• US Class Current: 623/22.42
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61F 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/3603 implanted without ablation of the whole natural femoral head endoprosthetic cartilage A61F2/30756
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/3085 with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2002/365 Connections of heads to necks
• CPC Class Codes: A61F 2002/3652 Connections of necks to shafts
• CPC Class Codes: A61F 2002/368 with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
• CPC Class Codes: A61F 2002/3686 bent
• CPC Class Codes: A61F 2002/4631 the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2002/4635 using minimally invasive surgery

Abstract

a minimal invasive hip arthroplasty device is provided. The system comprises a long nail portion, a lag screw portion, distal locking screws, and a resurfacing head. The long nail portion is inserted into a shaft body of a femur from a top portion of the femur and disposed in the femur. The lag screw portion engages and anchors at the long nail portion through a lag screw hole, and the lag screw portion is inserted into a neck of the femur. The distal locking screws queue through the shaft body of the femur perpendicularly and fix the long nail portion to the femur further. The resurfacing head comprises a cup portion configured to cover a head of the femur and a fixing pin portion configured to be inserted into the head and the neck of the femur and engaging the lag screw portion through a resurfacing head hole.

Claims

1. A minimal invasive hip arthroplasty device comprising:

a long nail portion configured to be inserted into a shaft body of a femur from a top portion of the femur and disposed in the femur;

a lag screw portion engaging and anchoring at the long nail portion through a lag screw hole with an angle from about 110 degrees to about 140 degrees, wherein the lag screw portion inserted into a neck of the femur;

one or more distal locking screws configured to queue through the shaft body of the femur perpendicularly and fix the long nail portion to the femur further; and

a resurfacing head comprising a cup portion configured to cover a head of the femur and a fixing pin portion configured to be inserted into the head and the neck of the femur and engaging the lag screw portion through a resurfacing head hole to support the cup portion.

2. The minimal invasive hip arthroplasty device according to claim 1, wherein the lag screw hole is provided obliquely through the long nail portion.

3. The minimal invasive hip arthroplasty device according to claim 2, wherein the long nail portion is cylindrical and hollow, and wherein the long nail portion further comprises a set screw configured to engage threads provided inside the long nail portion.

4. The minimal invasive hip arthroplasty device according to claim 3, wherein the lag screw portion comprises:

a support portion configured to queue into the lag screw hole;

a screw portion extending from the support portion;

the resurfacing head hole provided through the screw portion; and

a locking groove provided lengthwise along an outer surface of the support portion.

5. The minimal invasive hip arthroplasty device according to claim 4, wherein the set screw is configured to proceed along the threads provided inside the long nail portion and lock into the locking groove of the lag screw portion so as to prevent from rotating and allowing the lag screw portion to slide along the lag screw hole.

6. The minimal invasive hip arthroplasty device according to claim 4, wherein the resurfacing head hole comprises inner male threads configured to engage female threads provided on the fixing pin portion.

7. The minimal invasive hip arthroplasty device according to claim 1, wherein the long nail portion further comprises one of more distal locking screw holes provided in a low portion of the long nail portion substantially perpendicularly to a direction of length of the long nail portion.

8. The minimal invasive hip arthroplasty device according to claim 7, wherein one of the one or more distal locking screw holes has an oblong cross-section along the direction of length of the long nail portion so as to allow the distal locking screw to be adjusted upward or downward.

9. The minimal invasive hip arthroplasty device according to claim 1, wherein each of the one or more distal locking screws comprises a head portion and a male thread portion.

10. The minimal invasive hip arthroplasty device according to claim 9, wherein each of the one or more distal locking screw holes comprises inner female threads for engaging the male thread portion of the distal locking screw.

11. The minimal invasive hip arthroplasty device according to claim 1, wherein the long nail portion further comprises an end cap configured to cap the top end option of the long nail portion.

12. The minimal invasive hip arthroplasty device according to claim 11, wherein the end cap comprises a male thread portion configured to engage the inner female threads of the long nail portion.

13. The minimal invasive hip arthroplasty device according to claim 1, wherein the fixing pin portion of the resurfacing head is fixed to the resurfacing head hole provided through the lag screw portion by means of adhesive or glue.

14. The minimal invasive hip arthroplasty device according to claim 1, wherein the fixing pin portion of the resurfacing head is fixed to the resurfacing head hole provided through the lag screw portion by means of cement.

15. The minimal invasive hip arthroplasty device according to claim 1, wherein the long nail portion is bent slightly by a predetermined angle in a middle portion.

16. The minimal invasive hip arthroplasty device according to claim 15, wherein the predetermined angle is determined by a general shape of the femur.

17. The minimal invasive hip arthroplasty device according to claim 1, wherein the resurfacing head is configured to engage an acetabular cup embedded in a portion of pelvis.

18. The minimal invasive hip arthroplasty device according to claim 1, wherein the acetabular cup is fixed to the pelvis by means of cement or Porocoat®

porous coating.