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Expandable porous mesh bag device and methods of use for reduction, filling, fixation and supporting of boneRelated Patent Categories: Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor, Implantable Prosthesis, Bone, Spine Bone, Having A Fluid Filled ChamberExpandable porous mesh bag device and methods of use for reduction, filling, fixation and supporting of bone description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060149379, Expandable porous mesh bag device and methods of use for reduction, filling, fixation and supporting of bone. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional application of U.S. patent Ser. No. 10/440,036, filed May 16, 2003, which claims priority to U.S. patent application Ser. No. 09/909,667, filed Jul. 20, 2001, which claims priority to U.S. Provisional Application No. 60/219,853 filed Jul. 21, 2000, the entirety of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] This invention relates to methods and devices for correcting bone abnormalities and involves the use of a surgical mesh bag which is inserted into a prepared cavity in bone. The bag is inflated using bone replacement material to expand and fill the cavity. [0003] U.S. Pat. Nos. 5,549,679 and 5,571,189 to Kuslich, describe a device and method for stabilizing the spinal segment with an expandable, porous fabric implant for insertion into the interior of a reamed out disc which is packed with material to facilitate bony fusion. In the present invention, a similar bag is used to correct bone abnormalities including, but not limited to, bone tumors and cysts, tibial plateau fractures, avascular necrosis of the femoral head and compression fractures of the spine. [0004] U.S. Pat. Nos. 5,108,404 and 4,969,888 to Scholten et al., describe a system for fixing osteoporotic bone using an inflatable balloon which compacts the bone to form a cavity into which bone cement is injected after the balloon is withdrawn. The invention requires the use of fluoroscopy to monitor the injection and to help guard against cement leakage through fissures in bone. Unfortunately, such leakage is known to occur in spite of these precautions. Since such leakage may cause serious injury, including paralysis, an improved device and method is needed. [0005] U.S. Pat. No. 5,972,015 to Scribner et al., describes a system of deploying a catheter tube into the interior of a vertebra and expanding a specially configured nonporous balloon therewithin to compact cancellous bone to form a cavity. The Scribner patent approach utilizes a non-porous balloon which is inflated within the bone to cause compression. The cavity thus formed, may then be filled with bone cement. Unfortunately, the bag used by Scribner may be ruptured during expansion to compact cancellous bone due to sharp projections found within the cavity to be expanded. Filling the cavity eventually formed could allow leakage of bone cement out of the bone against vessels or nerves which may cause undesirable complications. [0006] The present invention involves an improvement of all of the previous techniques and avoids complications that could occur with the system of U.S. Pat. No. 5,972,015. [0007] All U.S. patents, applications and all other published documents mentioned anywhere in this application are incorporated herein by reference in their entirety. [0008] The art described in this section is not intended to constitute an admission that any patent, publication or other information referred to herein is "prior art" with respect to this invention, unless specifically designated as such. In addition, this section should not be construed to mean that a search has been made or that no other pertinent information as defined in 37 C.F.R. .sctn. 1.56(a) exists. SUMMARY OF THE INVENTION [0009] The invention provides a method of correcting numerous bone abnormalities including bone tumors and cysts, avascular necrosis of the femoral head, tibial plateau fractures and compression fractures of the spine. The abnormality may be corrected by first accessing and boring into the damaged tissue or bone and reaming out the damaged and/or diseased area using any of the presently accepted procedures, or the damaged area may be prepared by expanding a bag within the damaged bone to compact cancellous bone. After removal and/or compaction of the damaged tissue the bone must be stabilized. [0010] In cases in which the bone is to be compacted, the methods and devices of this invention employ a catheter tube attached to an inflatable porous fabric bag as described in U.S. Pat. Nos. 5,549,679 and 5,571,189 to Kuslich, the disclosures of which are incorporated herein by reference. Those bags may be inflated with less fear of puncture and leakage of the inflation medium than thin walled rubber balloons. They may also be used over a Scribner balloon to protect the balloon from breakage and eventually seepage. [0011] The devices of U.S. Pat. Nos. 5,549,679 and 5,571,189 to Kuslich, additionally provide the surgeon with the advantage of safely skipping the first balloon inflation steps of Scribner and Scholten, by expanding the bag through introduction of fill material, such as a bone repair medium thereby correcting the bony defect and deformity and stabilizing it in one step of the procedure. [0012] As indicated above, the damaged bone may be removed by any conventional reamer. Examples of reamers are described in U.S. Pat. No. 5,015,255; U.S. patent application Ser. No. 09/782,176, to Kuslich et al., entitled "Expandable Reamer" and filed Feb. 13, 2001; and U.S. patent application Ser. No. 09/827,202 to Peterson et al., entitled "Circumferential Resecting Reamer Tool," filed Apr. 5, 2001. Other examples of reamers are known and may be used. After the damaged bone or tissue has been removed, bone repair medium may then be inserted into the cavity thus formed, via a catheter and expandable fabric bag as described in U.S. Pat. Nos. 5,549,679 and 5,571,189. [0013] Alternatively, either a smaller than desired cavity may be formed into the bone to be enlarged by compaction or the cavity may be formed only by compaction through introduction of fill material into the bag. In either case, the bag may be positioned over the inflation balloon which is then inflated within the bone site to provide the degree of compaction required. The bag may then be filled with fill material, such as bone repair medium while the balloon remains in place within the bag. Alternatively, the balloon may be removed from the bag prior to filing the bag. BRIEF DESCRIPTION OF THE DRAWINGS [0014] A detailed description of the invention is hereafter described with specific reference being made to the drawings in which: [0015] FIG. 1 is a side elevational view of a vertebra that is fractured and in need of repair; [0016] FIG. 2 is a side view of the vertebra of FIG. 1 being reamed out with a reaming tool from the anterior approach; [0017] FIG. 3 is a top view of the vertebra of FIG. 1 showing the reamer forming a pair of cavities within the vertebra from the anterior approach; [0018] FIG. 4 is a side elevational view of the vertebra of FIG. 2 showing placement of an expandable fabric bag of the invention; [0019] FIG. 5 is a top elevational view of the vertebra of FIG. 3 showing a second of two expandable fabric bags of the invention being positioned; [0020] FIG. 6 is a side view of a vertebra being reamed from a posterior approach; Continue reading about Expandable porous mesh bag device and methods of use for reduction, filling, fixation and supporting of bone... 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