FLUTED OSTEOTOME AND SURGICAL METHOD FOR USE

• US 20130004918A1
• Filed: 09/10/2012
• Published: 01/03/2013
• Est. Priority Date: 03/23/2011
• Status: Active Grant

• Current Assignee: Salah Huwais
• Original Assignee: Salah Huwais
• Inventors: Huwais, Salah
• Granted Patent: US 9,028,253 B2
• Time in Patent Office: Days
• US Class Current: 433/173
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1615 Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material
• CPC Class Codes: A61B 17/885 Tools for expanding or compacting bones or discs or cavities therein A61B17/8805, A61B17/7097 take precedence
• CPC Class Codes: A61C 8/0089 Implanting tools or instruments

Abstract

A surgical method and tool for expanding an initial osteotomy (42) to receive a bone implant (44). An osteotome (22) having a tapered working end (28) is inserted into the initial osteotomy (42). The initial osteotomy (42) is enlarged by simultaneously rotating and pushing the working end (28) of the tapered osteotome (22) into the osteotomy (42). When rotated in one direction the burnishing edges (40) concentrate the pushing and rotational force in outward normal and tangential component forces against the interior surface of the osteotomy (42) to incrementally expand the osteotomy (42) with little to no removal of bone material (46). When rotated in the opposite direction the burnishing edges cut the interior surface of the osteotomy. Progressively larger tapered osteotomes (22) are used until an osteotomy (42) of predetermined size is achieved.

Claims

1. A surgical method for expanding an initial osteotomy to receive a bone implant, said method comprising the steps of:

providing an osteotome having a tapered working end;

inserting the tapered working end of the osteotome into an initial osteotomy, the initial osteotomy having an interior surface surrounded by bone;

enlarging the initial osteotomy by forcibly advancing the osteotome into the initial osteotomy;

repeating said inserting and enlarging steps with progressively larger tapered osteotomes, as needed, until an osteotomy of predetermined size is achieved; and

installing a bone implant into the expanded osteotomy;

wherein the improvement comprises,

the working end of the tapered osteotome having one or more longitudinally extending burnishing edges;

said enlarging step including simultaneously rotating and pushing the working end of the tapered osteotome into the osteotomy so that the one or more burnishing edges concentrate the pushing and rotational force through the burnishing edge in outward normal and tangential component forces against the interior surface of the osteotomy to incrementally expand the osteotomy with little to no removal of bone material.

2. The surgical method of claim 1, wherein the working end of the osteotome includes at least one flute extending from a root shaft, the burnishing edge is carried on the flute, and wherein said enlarging step includes maintaining a separation space between the root shaft and the bone interior surface of the osteotomy.

3. The surgical method of claim 2, wherein the at least one flute extends radially outwardly to a crest defining the major diameter of the osteotome, the burnishing edge disposed along the crest.

4. The surgical method of claim 2, wherein the burnishing edge is non-rotatably fixed relative to the root shaft.

5. The surgical method of claim 2, wherein the burnishing edge is defined by a large negative rake angle.

6. The surgical method of claim 1, wherein said enlarging step includes rotating the working end of the osteotome at speeds between about 200-1200 RPM.

7. The surgical method of claim 1, wherein said enlarging step includes applying a torque to the working end of the osteotome between about 15-50 Ncm.

8. The surgical method of claim 1, wherein said enlarging step includes bouncing the burnishing edge into and out of contact with the interior surface of the osteotomy while continuously rotating the osteotome.

9. The surgical method of claim 1, wherein the osteotome has a predetermined number of burnishing edges, and wherein said repeating step includes providing a progressively larger tapered osteotome having a greater number of burnishing edges that the predetermined number of a preceding osteotome.

10. The surgical method of claim 1, wherein said step of installing a fixture portion includes directly engaging an exterior anchoring thread form of the fixture portion into the expanded osteotomy formed by a burnishing edge.

11. The surgical method of claim 1, wherein the burnishing edge has a spiral twist along the length of the osteotome.

12. The surgical method of claim 1, wherein the burnishing edge has a generally straight configuration along the length of the osteotome.

13. The surgical method of claim 1, further including the step of preparing an initial osteotomy site by exposing bone, drilling a pilot hole into the bone, the pilot hole comprising the initial osteotomy.

20. The surgical method of claim 1, wherein the burnishing edge has a spiral twist along the length of the osteotome.

14. A surgical method for expanding an initial osteotomy to receive a bone implant, said method comprising the steps of:

providing an osteotome having an upper end and a tapered working end, the working end of the tapered osteotome haying one or more longitudinally extending burnishing edges;

locking the upper end of the osteotome in a drill motor;

rotating the osteotome in a first rotary direction by the drill motor;

inserting the tapered working end of the osteotome into an initial osteotomy, the initial osteotomy having an interior surface surrounded by bone;

enlarging the initial osteotomy by pushing the working end of the tapered osteotome into the initial osteotomy and simultaneously rotating the osteotome in the first rotary direction so that the one or more burnishing edges cut against the interior surface of the osteotomy to expand the osteotomy by removal of bone material,

repeating said locking and said inserting and said enlarging steps with a second larger tapered osteotome but rotating the second larger osteotome in a second rotary direction by the drill motor, the second rotary direction being reverse of the first rotary direction to concentrate the pushing and rotational force through the burnishing edge in outward normal and tangential component forces against the interior surface of the osteotomy to incrementally expand the osteotomy with little to no removal of bone material.

15. The surgical method of claim 14, wherein the working end of the osteotome includes at least one flute extending from a root shaft, the burnishing edge is carried on the flute, and wherein said enlarging step includes maintaining a separation space between the root shaft and the bone interior surface of the osteotomy.

16. The surgical method of claim 15, wherein the at least one flute extends radially outwardly to a crest defining the major diameter of the osteotome, the burnishing edge disposed along the crest.

17. The surgical method of claim 15, wherein the burnishing edge is non-rotatably fixed relative to the root shaft.

18. The surgical method of claim 15, wherein the burnishing edge is defined by a large negative rake angle.

19. The surgical method of claim 14, wherein said enlarging step includes bouncing the burnishing edge into and out of contact with the interior surface of the osteotomy while continuously rotating the osteotome.