FreshPatents.com Logo
stats FreshPatents Stats
1 views for this patent on FreshPatents.com
2012: 1 views
Updated: April 14 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.

AdPromo(14K)

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.



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 0.58689 seconds


Other interesting Freshpatents.com categories:
Computers:  Graphics I/O Processors Dyn. Storage Static Storage Printers -g2-0.2127
     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