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Prosthetic implant with biplanar angulation and compound angles

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Prosthetic implant with biplanar angulation and compound angles


A prosthetic implant, and more particularly, with a prosthetic implant having biplanar angulation and that can be inserted into a disk area generally straight using a posterolateral approach.

Browse recent X-spine Systems, Inc. patents - Miamisburg, OH, US
Inventor: David Louis Kirschman
USPTO Applicaton #: #20120290091 - Class: 623 1716 (USPTO) - 11/15/12 - 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

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The Patent Description & Claims data below is from USPTO Patent Application 20120290091, Prosthetic implant with biplanar angulation and compound angles.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No. 12/336,753, filed Dec. 17, 2008, which is incorporated herein by reference and made a part hereof.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a prosthetic implant, and more particularly, with a prosthetic implant having a biplanar angulation to permit insertion straight along a diagonal angle into a disk space.

2. Description of the Related Art

Spinal fusion is a commonly performed procedure. In a typical spinal fusion operation, a surgeon places a mechanical container, commonly known as a cage, between at least two adjacent vertebrae of the spine. This container contains or is later filled with bone graft which eventually incorporates into the adjacent vertebrae and creates a solid fusion. Interbody cages are placed in the disk space following removal of the disk. The cage can be surgically placed via several approaches, such as anteriorly through the abdomen, posteriorly through the spinal canal, posterolaterally through the neuroforamen of the vertebra, and transversely from a side of the spine. A goal of the surgical approach is to minimize trauma to adjacent structures and incision size.

A challenge to the placement of cages is the attainment of proper fitment between the adjacent vertebrae. It is important that a cage surface fits flushly against the endplates of the adjacent vertebrae. If a cage fits poorly, the cage could loosen, causing poor fixation and potential re-operation. The disk space, where the cage is placed, is not parallel. The space is angulated such that it is wider anteriorly than posteriorly. This angulation is termed lordosis.

Several cage designs have been proposed in the prior art. Brantigan (U.S. Pat. No. 4,834,757) describes a square shaped cage which is impacted in between vertebrae. Michelson (U.S. Pat. No. 5,015,247) describes a straight threaded cage which is screwed into the disk space. Brantigan (U.S. Pat. No. 5,425,772) and Michelson (U.S. Pat. No. 6,302,914) describe a cage with a built in single-plane lordotic angle to improve fitment between adjacent vertebrae. These cages are designed for posterior or anterior placement.

The placement of cages from posterior, lateral, and anterior approaches raise concerns about potential impingement upon important anatomical structures. Such structures are the spinal canal, the spinal nerves, and the abdominal vasculature, respectively. The posterolateral approach, also called the transforamenal approach, is gaining popularity as the preferred approach for the placement of intervertebral fusion cages. Typically, cages designed for this approach are “banana shaped,” as exemplified by Varga, et al (U.S. Pat. No. 6,579,318).

A significant difficulty with banana-type cages is that their placement requires cage rotation at the time of placement to seat the cage in place. The cage is inserted at a 45 degree lateral angle into the disk space (the maximum angle limited by anatomical structures) and is then rotated a further 45 degrees within the disk space for proper placement. This rotational step is difficult in that it occurs blindly inside the disk space. Incomplete rotation frequently occurs, resulting in poor cage fitment, with potential loosening and reoperation.

If a Brantigan (U.S. Pat. No. 4,834,757) cage were inserted in a diagonal or non-straight trajectory, it would not have flush contact with the adjacent vertebrae due to the lordotic angle of the disk space. Furthermore, a standard lordotic cage, such as Michelson (U.S. Pat. No. 6,302,914), would have its lordotic angle in the incorrect orientation for proper fitment if placed diagonally.

What is needed is a cage that can be placed via the posterolateral approach in a straight manner and that does not require a further rotation for placement. Desirably, such a cage will be placed at a straight angle relative to an anterior-posterior axis and, preferably, at a diagonal or angle, such as approximately 45 degrees and reside in a diagonal configuration within the disk space.

SUMMARY

OF THE INVENTION

Accordingly, one object of the invention is to provide a cage having a biplanar angulation.

Another object of the invention is to provide a cage that has a biplanar angulation and that may be inserted straight into a disk space, at an angle or diagonally relative to the anterior-posterior axis of the spine.

Still another object of the invention is to provide a cage having a biplanar angulation and that minimizes or eliminates the need for rotation after the cage is inserted into the disk space.

Yet another object of the invention is to provide a cage having lateral slots or channels for insertion of a tool or instrument to facilitate placement of the cage.

In one aspect, this invention comprises a fusion cage comprising a cage body having a plurality of surfaces, the plurality of surfaces cooperating to define a multi-planar angulation adapted to achieve substantially flush fitment in a disk space between adjacent vertebrae when the fusion cage is inserted in the disk space.

In another aspect, this invention comprises a method for fusing bones, the method comprising the steps of providing a cage adapted to be inserted into a disk area substantially diagonally or in an angled direction with respect to an anterior-posterior axis, the cage having a first surface lying in a first plane and a second surface lying in a second plane, and inserting the cage in the substantially diagonal or angled direction such that the first and second surfaces engage a surface of a first vertebrae and a second vertebrae substantially flush.

These and other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

FIG. 1 is a perspective view of a cage in accordance with one embodiment of the invention showing the cage placed in a disk space;

FIG. 2 is a view, taken along the line 2-2 in FIG. 1, showing the cage inserted straight and at a diagonal or an angle with respect to an anterior-posterior axis;

FIG. 3 is a perspective view showing various details of the cage shown in FIGS. 1 and 2;

FIG. 4 is another perspective view of the cage of FIG. 1;

FIG. 5 is a perspective view of the cage with various projection lines showing the dimensional relationships between the various line segments to illustrate the biplanar angulation or compound angles formed by the various surfaces of the cage;

FIG. 5A is view showing imaginary planes corresponding to the superior and inferior surfaces of the cage, showing their relative relationship and multi-planar or bi-planer angulation;

FIG. 5B is a view, taken in the direction of arrow A in FIG. 5A, showing the relationship of the planes and biplanar angulation of the surfaces;

FIG. 6 is a front view of the cage;

FIG. 7 is a rear view of the cage;

FIG. 8 is a side view of the cage shown in FIG. 1, showing the various relationships and dimensions and relative dimensions of the various corners of the cage;

FIGS. 9 and 10 are illustrative embodiments showing different multi-planar or biplanar angulations;

FIG. 11 is a cross-sectional view taken along the line 11-11 in FIG. 5;

FIG. 12 is a diagonal view taken along the line 12-12 in FIG. 5;

FIG. 13 is a sectional view taken along the line 13-13 in FIG. 5;

FIG. 14 is a fragmentary exploded perspective view of a portion of a cage and an insertion tool;

FIG. 15 is a perspective view of yet another embodiment of the cage of FIG. 1;

FIG. 16 is a front view of the cage;

FIG. 17 is a rear view of the cage;

FIG. 18 is a perspective view of the cage similar to FIG. 5;

FIGS. 19A and 19B are views similar to FIGS. 5A and 5B, respectively;

FIG. 20A illustrates a cage placed in a space between two disks;

FIG. 20B is a view taken along line 20B-20B of FIG. 20A;

FIG. 20C is a view taken along line 20C-20C of FIG. 20A;

FIG. 20D is a view taken along line 20D-20D of FIG. 20A;

FIG. 21A is a view similar to FIG. 20A showing use of another cage;

FIG. 21B is a view taken along line 21B-21B of FIG. 21A;

FIG. 21C is a view taken along line 21C-21C of FIG. 21A;

FIG. 21D is a view taken along line 21D-21D of FIG. 21A;

FIG. 22A is a view similar to FIGS. 20A and 21A;

FIG. 22B is a view taken along line 22B-22B of FIG. 21A;

FIG. 22C is a view taken along line 22C-22C of FIG. 21A;



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Previous Patent Application:
Minimally invasive expanding spacer and method
Next Patent Application:
Spinal implants
Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor
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stats Patent Info
Application #
US 20120290091 A1
Publish Date
11/15/2012
Document #
13493032
File Date
06/11/2012
USPTO Class
623 1716
Other USPTO Classes
International Class
61F2/44
Drawings
14



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