Method for using retractable stylet and cannula combination to form an opening in bone

• US 20070260255A1
• Filed: 05/04/2006
• Published: 11/08/2007
• Est. Priority Date: 05/04/2006
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Inventors: Justis, Jeff, Simonton, T., Haddock, Sean
• Granted Patent: US 7,842,038 B2
• Time in Patent Office: Days
• US Class Current: 606/80
• CPC Class Codes: A61B 10/025 for taking bone, bone marrow or cartilage samples
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 17/3472 for bones, e.g. intraosseus injections
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable for prosthetic joint-implanting tools A61F2/4603
• CPC Class Codes: A61B 2017/349 Trocar with thread on outside

Abstract

In one preferred aspect, a method is provided for forming an opening in bone for the sequential dilation of tissue.

Claims

1. A method for forming an opening in bone comprising the steps of:

providing a surgical instrument comprising;

an outer sleeve having a distal end, a proximal end, a passage therethrough, and a mid-longitudinal axis;

a middle sleeve having a distal end, a proximal end, a passage therethrough, and a mid-longitudinal axis, the middle sleeve being sized and configured to be inserted into the passage of the outer sleeve;

a trocar having a distal end, a proximal end, and a mid-longitudinal axis, the trocar being sized and configured to be inserted into the passage of the middle sleeve;

placing the middle sleeve into the outer sleeve with at least a portion of the distal end of the middle sleeve extending beyond the distal end of the outer sleeve;

placing the trocar into the middle sleeve with at least a portion of the distal end of the trocar extending beyond the distal end of the middle sleeve and the outer sleeve;

inserting the surgical instrument with the distal end of the trocar into the bone;

advancing into the bone the surgical instrument with the trocar, the middle sleeve, and the outer sleeve in fixed relationship to form an opening into the bone;

removing the trocar from the middle sleeve with the middle sleeve and outer sleeve remaining in the bone;

further advancing into the bone the surgical instrument with the middle sleeve and outer sleeve in fixed relationship to enlarge the opening being formed into the bone;

removing the middle sleeve from the outer sleeve with the outer sleeve remaining in the bone; and

further advancing into the bone the surgical instrument to enlarge the opening being formed into the bone.

2. The method of claim 1, wherein the bone is a vertebra.

3. The method of claim 1, further comprising the step of rotating the release mechanism.

4. The method of claim 1, further comprising the step of withdrawing the instruments through the top of the handle.

5. The method of claim 1, further comprising the step of rotating the entire instrument at least in part during insertion.

6. The method of claim 1, further comprising the step of threadably engaging the distal end of the outer sleeve into the bone.

7. The method of claim 1, wherein the step of advancing further includes advancing the instrument through a pedicle of a vertebra.

8. The method of claim 1, wherein the step of advancing includes the sub-step of advancing the trocar to predetermined depth into the bone.

9. The method of claim 8, wherein the predetermined depth is the anterior third of a vertebral body.

10. The method of claim 8, further comprising the step of inserting the middle sleeve to approximately the same predetermined depth of the trocar.

11. The method of claim 8, further comprising the step of inserting the outer sleeve to approximately the same predetermined depth of the trocar.

12. The method of claim 1, further comprising the step of placing a second middle sleeve into the outer sleeve with at least a portion of the distal end of the second middle sleeve extending beyond the distal end of the outer sleeve.

13. The method of claim 1, further comprising the step of introducing another instrument through the outer sleeve and into the opening formed into bone.

14. The method of claim 1, further comprising the step of introducing a material through the outer sleeve and into the opening formed into the bone.

15. The method of claim 1, further comprising the step of providing a handle having a passage coaxial with the passage of the outer sleeve, the passage of the middle sleeve, and the mid-longitudinal axis of the trocar, the handle being adapted to be removably coupled to the outer sleeve.

16. The method of claim 15, wherein the step of removing the trocar includes the sub-step of using the handle to withdraw only the trocar from the bone.

17. The method of claim 15, wherein the step of removing the middle sleeve includes the sub-step of using the handle to withdraw only the middle sleeve from the bone.

18. The method of claim 15, wherein the handle includes a release mechanism and further comprising the step of placing the release mechanism in a first position for holding the trocar, the middle sleeve, and the outer sleeve in fixed relationship to the handle.

19. The method of claim 18, further comprising the step of placing the release mechanism in a second position for holding the middle sleeve and the outer sleeve in fixed relationship to the handle.

20. The method of claim 19, further comprising the step of placing the release mechanism in a third position for holding the outer sleeve in fixed relationship to the handle.