Patient-mounted retraction

Patent metadata

Field	Value
Publication number	US-9808281-B2
Application number	US-78405110-A
Country	US
Kind code	B2
Filing date	May 20, 2010
Priority date	May 20, 2009
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Patient-mounted retractors with varying configurations and/or features are provided, along with additional components for use therewith in provided patient-mounted retractor assemblies. Blade type and tube type patient-mounted retractors that may be re-positioned during the course of a procedure are provided in varying configurations and/or geometries suitable for varying procedures and/or patient anatomies. Applications of re-positionable patient-mounted retractor assemblies are particularly suitable for use in minimally invasive procedures, eliminating the need for table-mounted retraction assemblies and/or cannulas that restrict the operating environment.

First claim

What is claimed:

1. A retractor assembly comprising:
a retractor body including a proximal end defined along a first axis and a distal end opposite the proximal end, the proximal end defining an inner surface that faces the first axis, and an outer surface opposed to the inner surface, wherein at least a portion of the retractor body is open so as to define a channel, the channel being elongate along the first axis, and the retractor body further defines at least one flange extending outwardly therefrom between the proximal and distal ends;
an anchor receptacle disposed at the distal end of the retractor body, the anchor receptacle defined along a second axis that extends through the channel, the anchor receptacle having an anchor receptacle proximal end and an anchor receptacle distal end that is spaced from the anchor receptacle proximal end along the second axis, wherein the channel is open from the proximal end of the retractor body toward the anchor receptacle proximal end,
wherein the second axis is offset with respect to the first axis such that 1) an entirety of the proximal end of the retractor body is offset from the second axis in a direction that is perpendicular to the second axis, and 2) the outer surface of the proximal end of the retractor body faces the second axis; and
a locking assembly carried by the anchor receptacle, the locking assembly configured to attach to the retractor body and to a bone anchor that is configured to be driven into an underlying target location of a patient such that the bone anchor is connectable to the retractor body.

2. The retractor assembly of claim 1 , wherein when the retractor body is connected to the bone anchor, the locking assembly is configured to lock or unlock rotation of the retractor body relative to the bone anchor.

3. The retractor assembly as recited in claim 2 , wherein when the locking assembly is locked, the retractor body is configured to be positionally fixed relative to the bone anchor, and when the locking assembly is unlocked, the retractor body is not positionally fixed relative to the bone anchor.

4. The retractor assembly as recited in claim 3 , wherein the locking assembly comprises:
a collet having a proximal end, a distal end opposite the proximal end, and an interior volume defined within the distal end of the collet, the interior volume configured to capture and retain a head of the bone anchor; and
a locking cap having a threaded outer surface configured to engage complimentary threads formed within the anchor receptacle,
wherein application of a rotational force to the locking cap advances the locking cap within the anchor receptacle, thereby causing the collet to create an interference force between the head of the bone anchor and the anchor receptacle.

5. The retractor assembly as recited in claim 4 , wherein the collet has a plurality of slots formed in the distal end of the collet, the slots defining a plurality of deflectable fingers.

6. The retractor assembly as recited in claim 4 , wherein the proximal end of the collet has an upper surface with an engagement structure formed thereon, the engagement structure configured to engage a lower surface of the locking cap.

7. The retractor assembly as recited in claim 4 , further comprising a wedge disposed between the collet and the locking cap, the wedge configured to distribute force from the locking cap to the collet when the locking cap is advanced within the anchor receptacle.

8. The retractor assembly as recited in claim 1 , further comprising the bone anchor.

9. The retractor assembly as recited in claim 8 , wherein the bone anchor has a polyaxial head.

10. The retractor assembly as recited in claim 9 , wherein the retractor body is rotatably positionable about the polyaxial head of the bone anchor when the polyaxial head of the bone anchor is received in the anchor receptacle.

11. The retractor assembly as recited in claim 1 , wherein the retractor body defines an aperture formed therethrough, the aperture extending along an aperture axis that is aligned with the second axis, the aperture configured to receive a driving instrument.

12. The retractor assembly as recited in claim 1 , wherein the retractor body includes a first lateral edge and a second lateral edge, and the first and second lateral edges extend from the proximal end of the retractor body toward the distal end of the retractor body, wherein retractor body, the first lateral edge and the second lateral edge define the channel, and the retractor body is open from the proximal end of the retractor body to the anchor receptacle proximal end.

13. The retractor assembly as recited in claim 12 , wherein the anchor receptacle extends around an entirety of the second axis.

14. The retractor assembly as recited in claim 1 , the retractor body further defining an intermediate portion that extends between the proximal and distal ends along a third axis that is offset with respect to the first and second axes, wherein the channel surrounds the first, second, and third axes.

15. The retractor assembly as recited in claim 14 , wherein the intermediate portion is open.

16. The retractor assembly as recited in claim 15 , wherein the intermediate portion defines at least a portion of the channel.

17. The retractor assembly as recited in claim 16 , wherein the intermediate portion of the retractor body has an aperture formed therethrough, the aperture configured to receive a driving instrument.

18. The retractor assembly as recited in claim 14 , wherein a cross sectional dimension of the intermediate portion varies in magnitude between the proximal and distal ends.

19. The retractor assembly as recited in claim 18 , wherein the cross sectional dimension of the intermediate portion increases in magnitude between the proximal and distal ends.

20. The retractor assembly as recited in claim 18 , wherein the cross sectional dimension of the intermediate portion decreases in magnitude between the proximal and distal ends.

21. The retractor assembly as recited in claim 14 , wherein the intermediate portion is defined along the third axis, and the intermediate portion defines an offset region between the proximal and distal ends.

22. The retractor assembly as recited in claim 1 , wherein the retractor body defines a lateral edge that extends between the proximal and distal ends of the retractor body, and the at least one flange extends along the lateral edge of the retractor body adjacent the channel.

23. The retractor assembly as recited in claim 1 , wherein the at least one flange extends along a chord defined between two points on a circumference of the retractor body.

24. The retractor assembly as recited in claim 1 , wherein the at least one flange has a tab formed at a distal end of the flange.

25. The retractor assembly as recited in claim 24 , wherein the tab is configured to flexibly conform to bony geometry within a surgical site.

26. The retractor assembly as recited in claim 25 , wherein the tab comprises a flexible skirt.

27. The retractor assembly as recited in claim 1 , wherein the at least one flange is configured to form at least a portion of an access portal within a surgical site.

28. The retractor assembly as recited in claim 1 , wherein the retractor body defines an accessory attachment point configured to releasably engage an optional accessory.

2

Assignees

• Solitario Jr Ralph C
• Bankoski Brian
• Rossney Mark
• Figuereo Santiago
• Bohinski Robert
• Depuy Synthes Products Inc

Inventors

• Solitario Jr Ralph C
• Bankoski Brian
• Rossney Mark
• Figuereo Santiago
• Bohinski Robert

Classifications

• A61F2220/0025

  Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements · CPC title

• A61F2/442

  Intervertebral or spinal discs, e.g. resilient (non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455) · CPC title

• A61B2017/3419

  Sealing means between cannula and body · CPC title

• A61B2017/0256

  for the spine · CPC title

• A61B2017/00477

  Coupling (A61B2017/0046 takes precedence) · CPC title