Retractable stylet and cannula combination

• US 20070260184A1
• 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 8,167,899 B2
• Time in Patent Office: Days
• US Class Current: 604/164.10
• CPC Class Codes: A61B 17/16 Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans arthroscopic bone cutters A61B17/320016; dental implant drills potentially for other surgical use A61C8/0089; bone grinders A61F2/4644, A22C17/06; A61B17/1662 takes precedence over all other subgroups except A61B17/17
• CPC Class Codes: A61B 17/1671 for the spine
• 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 17/7061 for stabilising vertebrae or discs by improving the condition of their tissues, e.g. using implanted medication or fluid exchange intraosseous injection devices A61B17/3472
• CPC Class Codes: A61B 17/8819 characterised by the introducer proximal part, e.g. cannula handle, or by parts which are inserted inside each other, e.g. stylet and cannula A61B17/8825 takes precedence
• CPC Class Codes: A61B 2017/00261 Discectomy
• CPC Class Codes: A61B 2017/0046 with a releasable handle; with handle and operating part separable
• CPC Class Codes: A61B 2017/00477 Coupling A61B2017/0046 takes precedence

Abstract

In one preferred aspect, a surgical instrument for insertion into human tissue is provided with a release mechanism that permits one or more components of the surgical instrument to be removably coupled to a handle.

Claims

1. A surgical instrument for insertion into human tissue, said 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, said middle sleeve being sized and configured to be inserted into said passage of said outer sleeve, at least a portion of said distal end of said middle sleeve being configured to pass through and extend beyond said distal end of said outer sleeve;

a trocar having a distal end, a proximal end, and a mid-longitudinal axis, said trocar being sized and configured to be inserted into said passage of said middle sleeve, at least a portion of said distal end of said trocar being configured to pass through said outer sleeve and extend beyond said distal end of said outer sleeve; and

a handle having a passage coaxial with said passage of said outer sleeve, said passage of said middle sleeve, and the mid-longitudinal axis of said trocar, said handle being adapted to be removably coupled to said outer sleeve, said handle including a release mechanism having a first position for holding said trocar, said middle sleeve, and said outer sleeve in fixed relationship to said handle, said release mechanism having a second position for holding said middle sleeve and said outer sleeve in fixed relationship to said handle, said release mechanism having a third position for holding said outer sleeve in fixed relationship to said handle.

2. The instrument of claim 1, wherein said proximal end of said trocar includes a stop for limiting the depth of insertion of said trocar into said passage of said handle.

3. The instrument of claim 2, wherein said stop is configured to cooperatively engage said release mechanism.

4. The instrument of claim 1, wherein said proximal end of said middle sleeve includes a stop for limiting the depth of insertion of said trocar into said passage of said handle.

5. The instrument of claim 4, wherein said stop is configured to cooperatively engage said release mechanism.

6. The instrument of claim 1, wherein in said release mechanism includes at least one release member configured to releasably engage at least one of said trocar, said middle sleeve, and said outer sleeve.

7. The instrument of claim 6, wherein handle has sides and said release member is accessible from at least one of said sides of said handle.

8. The instrument of claim 1, wherein said trocar includes a hollow passage therethrough.

9. The instrument of claim 1, wherein at least one of said trocar, said middle sleeve, and said outer sleeve is of sufficient strength and rigidity to penetrate bone tissue.

10. The instrument of claim 1, wherein the passage of said middle sleeve has an inner dimension of approximately 2.5 to 15 mm.

11. The instrument of claim 1, wherein the passage of said outer sleeve has an inner dimension of approximately 3 to 20 mm.

12. The instrument of claim 1, wherein said distal end of said outer sleeve includes a thread.

13. The instrument of claim 1, wherein said distal end of said trocar has a sharpened portion to facilitate insertion into tissue.

14. The instrument of claim 13, wherein said sharpened portion of distal end of said trocar is angled.

15. The instrument of claim 13, wherein said sharpened portion of distal end of said trocar is beveled.

16. The instrument of claim 1, wherein said outer sleeve includes at least one transverse opening in communication with said passage and between said proximal and distal ends.

17. The instrument of claim 1, wherein said outer sleeve is sized and dimensioned to pass through a pedicle of a vertebra of a human spine.

18. The instrument of claim 1, further comprising a second middle sleeve having a distal end, a proximal end, a passage therethrough, and a mid-longitudinal axis, said second middle sleeve being sized and configured to be inserted into said passage of said outer sleeve, at least a portion of said distal end of said middle sleeve being configured to pass through and extend beyond said distal end of said outer sleeve.

19. The instrument of claim 1, wherein said release mechanism includes at least three release members independently moveable relative to one another.

20. The instrument of claim 1, wherein said release mechanism is adapted to operate at least in part by rotation.

21. The instrument of claim 20, wherein said release mechanism is adapted to rotate around the mid-longitudinal axis of at least one of said outer sleeve, said middle sleeve, and said trocar.