FreshPatents.com Logo
stats FreshPatents Stats
1 views for this patent on FreshPatents.com
2012: 1 views
Updated: August 12 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

Follow us on Twitter
twitter icon@FreshPatents

Expandable corpectomy spinal fusion cage

last patentdownload pdfdownload imgimage previewnext patent


20120277878 patent thumbnailZoom

Expandable corpectomy spinal fusion cage


An intervertebral expandable spacer having a pair of co-axial annuluses locked together by an engagement member having i) a set screw and ii) a pressure plate having an outer face contacting the set screw and an inner face having teeth adapted to mate with the ratchet notches of the second member.
Related Terms: Spinal Fusion

Inventors: Robert Sommerich, Glen Arthur Presbrey, Martin Meer, Gerhard Franz Pohl
USPTO Applicaton #: #20120277878 - Class: 623 1716 (USPTO) - 11/01/12 - Class 623 
Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor > Implantable Prosthesis >Bone >Spine Bone >Including Spinal Disc Spacer Between Adjacent Spine Bones

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120277878, Expandable corpectomy spinal fusion cage.

last patentpdficondownload pdfimage previewnext patent

CONTINUING DATA

This application claims priority from co-pending patent application U.S. Ser. No. 11/960,623, filed Dec. 19, 2007, entitled “Expandable Corpectomy Spinal Fusion Cage” (Docket No. DEP6073USNP), the specification of which is incorporated by reference in its entirety.

BACKGROUND OF THE INVENTION

One conventional spinal implant used in corpectomy cases is an intervertebral spacer for insertion between two vertebrae, wherein the spacer has an adjustable axial height, an annular first member and a second member which is guided within the first member and displaceable in axial direction relative to the first member for adjustment of the overall height.

Conventional spacers of this type of are often expanded by a threaded connection between the outer surface of the inner member and the inner surface of the outer member. The opposite ends of the spacer are often provided with spikes for secure seating into the adjacent vertebra. However, the requirement of rotating the members around the longitudinal axis also rotates the spikes, thereby risking injury to the adjacent vertebrae. U.S. Pat. No. 6,200,348 (Biedermann) discloses a spacer that is expandable without the need for rotation. The locking mechanism of the U.S. Pat. No. 6,200,348 includes a i) a pair of set screws, each set screw having a hemispherical distal end that seats in an outer annulus, and ii) a row of mating hemispherical recesses extending into an inner annulus.

SUMMARY

OF THE INVENTION

The present inventors have appreciated that although the spacer design disclosed in U.S. Pat. No. 6,200,348 has advantageously eliminated the need to rotate the pair of sleeved cage components in order to expand its height, it nonetheless does not contain a graft window. A graft window is a large opening in the face of the cage—an opening much larger than the diamond shaped holes provided in U.S. Pat. No. 6,200,348-used to insert graft into the cage. Providing a graft window is helpful in that it provides the surgeon with an access port into the center space of the cage through which the surgeon may insert bone graft into the cage. When a graft window is not provided, bone graft must be inserted into the cage prior to insertion of the cage into the spine (i.e., when the cage is in its unexpanded configuration). Thus, when the cage is later inserted into the spine and then expanded, the newly expanded portion of the cage contains no graft. Providing a graft window is helpful in that it allows the surgeon to place the cage into the spine, expand the cage and then fill the expanded cage with bone graft. Accordingly, there is no unfilled space in the expanded inserted cage having a graft window.

Therefore, in accordance with the present invention, there is provided a spacer for insertion between two vertebrae, the spacer having a variable axial height and comprising a first member and a second member guided within the first member to be slidable relative thereto in an axial direction thereof for adjusting an overall height,

wherein the second member comprises an outer wall and ratchet notches provided at its outer wall facing the first member and extending in the axial direction, wherein the first member comprises a wall having an engagement member, which cooperates with the ratchet notches for adjusting the overall height of the spacer, and

wherein the first member has a graft window therein for inserting graft material therethrough.

However, when the present inventors set out to modify the cage of U.S. Pat. No. 6,200,348 with a graft window, they found that inclusion of the graft window would either require removal of the locking mechanism to another location (such as the distal portion of the inner annulus, as shown in FIG. 6 below) or require that the graft window be very small.

The present inventors thus set out to redesign the locking mechanism of U.S. Pat. No. 6,200,348 so that inclusion of a graft window would not require removal of the locking mechanism to another location, nor require that the graft window be very small.

The present inventors found that replacing the set screw/spherical recess locking mechanism of U.S. Pat. No. 6,200,348 with a new mechanism solved the above noted problem. The new mechanism is an engagement member which comprises i) a set screw and ii) a pressure plate having an outer face contacting the set screw and an inner face having teeth adapted to mate with the ratchet notches of the second member

Moreover, the present inventors found that the new locking mechanism imparted a superior strength to the cage so that only one set screw was needed to lock the cage in its expanded condition.

Also in accordance with the present invention, there is provided a spacer for insertion between two vertebrae, said spacer having a variable axial height and comprising a first member and a second member guided within the first member to be slidable relative thereto in an axial direction thereof for adjusting an overall height,

wherein the second member comprises an outer wall and ratchet notches provided at its outer wall facing the first member and extending in the axial direction, wherein the first member comprises a wall having an engagement member, which cooperates with the ratchet notches for adjusting the overall height of the spacer, and

wherein the engagement member comprises i) a set screw and ii) a pressure plate having an outer face contacting the set screw and an inner face having teeth adapted to mate with the ratchet notches of the second member.

DESCRIPTION OF THE FIGURES

FIGS. 1a and 1b disclose front and back views of a cage of the present invention.

FIG. 1c discloses a cage of the present invention having windows in both annuluses.

FIG. 2a discloses a cage of the present invention in which the teeth of the pressure plate mate with the notches on the inner annulus.

FIG. 2b discloses details of the engagement mechanism of the present invention.

FIG. 3a discloses a perspective view of the engagement member of the present invention.

FIG. 3b discloses a cross-section of the engagement mechanism of the present invention having a pressure plate.

FIGS. 4a-4c disclose cages of the present invention respectively adapted for lateral, direct anterior and postero-lateral insertion.

FIG. 5 discloses a cage having the graft window on its inner annulus.

FIG. 6 discloses a cage of the present invention wherein the engagement mechanism comprises a pressure plate located on the distal portion of the inner second annulus and the notches located on the inner portion of the outer first annulus.

FIG. 7 discloses an inserter-expander instrument for inserting and expanding the cage of the present invention.

FIG. 8 discloses an inserter/expander instrument provided with a pistol grip

FIGS. 9a-9c disclose the pistol grip portion of the instrument rotated to three positions.

FIGS. 10a-10c disclose an embodiment of the second distractor and various portions thereof.

FIG. 11 discloses a plurality of endplate trials used with a posterior approach cage.

FIG. 12 discloses a graft loading block.

FIG. 13 discloses a bone tamp.

FIG. 14 discloses a grabber anti-torque instrument.

FIG. 15 discloses a pair of positioning impactors.

DETAILED DESCRIPTION

OF THE INVENTION

For the purposes of the present invention “spacer” and “cage” are used interchangeably.

Now referring to FIG. 1 there is provided a spacer for insertion between two vertebrae, the spacer having a variable axial height and comprising a sleeve-shaped first member 1 and a second member 2 guided within the first member to be slidable relative thereto in an axial direction thereof for adjusting an overall height,

wherein the second member comprises an outer wall 3 and ratchet notches 5 provided at its outer wall facing the first member and extending in the axial direction, and

wherein the first member comprises a wall 7 having an engagement member 9, which cooperates with the ratchet notches for adjusting the overall height of the spacer,

wherein the first member has a window 10 therein for inserting graft material therethrough, and

wherein the engagement member 9 comprises i) a set screw 11 and ii) a pressure plate 13 having an outer face 15 contacting the set screw and an inner face 17 having teeth 19 adapted to mate with the ratchet notches of the second member.

The first member generally has a tubular shape comprising a first annulus 21. The outer end of the first member should be adapted to seat upon a lower vertebral endplate, and so a substantially flat endplate 25 is generally attached to the outer end 27 of the first annulus. This endplate generally has a hole in its center and extends outwardly substantially radially from the outer end of the annulus. The outer face 28 of the endplate should be adapted to grip the lower vertebral endplate and so is generally provided with roughened features 29. These roughened features may be a plurality of uniformly distributed, pointed teeth 31 that bite into the adjacent endplate. In other embodiments, the teeth may be non-uniformly distributed. For further insuring that the endplate will be stably seated into the vertebral endplate, the outer face of the endplate may also have a few long spikes 33 extending therefrom. In some embodiments, the endplate has an overall convex shape in order to suitably conform to the overall concave shape of the natural vertebral endplate in which it seats. In some embodiments (as in FIG. 1c), the endplate has a wedge cross-section in order to conform to the lordosis adopted by the natural spine in the region of the implant. Typically, the wedge is designed to provided a lordotic angle of between about 0 and about 24 degrees, more typically between about 6 and about 12 degrees. The wedge may also be designed to provided a kyphotic angle of between about 0 and about −12 degrees,



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Expandable corpectomy spinal fusion cage patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Expandable corpectomy spinal fusion cage or other areas of interest.
###


Previous Patent Application:
Cannula assembly with non-circular profile and method of use
Next Patent Application:
Expandable implant system and methods of use
Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
Thank you for viewing the Expandable corpectomy spinal fusion cage patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.58534 seconds


Other interesting Freshpatents.com categories:
Computers:  Graphics I/O Processors Dyn. Storage Static Storage Printers

###

Data source: patent applications published in the public domain by the United States Patent and Trademark Office (USPTO). Information published here is for research/educational purposes only. FreshPatents is not affiliated with the USPTO, assignee companies, inventors, law firms or other assignees. Patent applications, documents and images may contain trademarks of the respective companies/authors. FreshPatents is not responsible for the accuracy, validity or otherwise contents of these public document patent application filings. When possible a complete PDF is provided, however, in some cases the presented document/images is an abstract or sampling of the full patent application for display purposes. FreshPatents.com Terms/Support
-g2-0.1851
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120277878 A1
Publish Date
11/01/2012
Document #
13546560
File Date
07/11/2012
USPTO Class
623 1716
Other USPTO Classes
International Class
61F2/44
Drawings
20


Spinal Fusion


Follow us on Twitter
twitter icon@FreshPatents