US20060095136A1 - Bone fusion device - Google Patents
Bone fusion device Download PDFInfo
- Publication number
- US20060095136A1 US20060095136A1 US11/264,958 US26495805A US2006095136A1 US 20060095136 A1 US20060095136 A1 US 20060095136A1 US 26495805 A US26495805 A US 26495805A US 2006095136 A1 US2006095136 A1 US 2006095136A1
- Authority
- US
- United States
- Prior art keywords
- fusion device
- bone fusion
- bone
- tab
- bones
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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- A61F2/446—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00389—The prosthesis being coated or covered with a particular material
- A61F2310/00976—Coating or prosthesis-covering structure made of proteins or of polypeptides, e.g. of bone morphogenic proteins BMP or of transforming growth factors TGF
Definitions
- This invention relates generally to bone fusion devices. More specifically, the present invention relates to devices for fusing vertebrae of the spine that can be inserted arthroscopically.
- the spinal column is made up of vertebrae stacked on top of one another. Between the vertebrae are discs which are gel-like cushions that act as shock-absorbers and keep the spine flexible. Damage, disease, or excessive pressure on the discs can cause degenerative disc disease or other disorders where the disc becomes thinner and allows the vertebrae to move closer together or become misaligned. As a result, nerves may become pinched, causing pain that radiates into other parts of the body, or instability of the vertebrae may ensue.
- the fusion cage is typically a hollow metal device usually made of titanium. Once inserted, the fusion cage maintains the proper separation between the vertebrae to prevent nerves from being pinched and provides structural stability to the spine. Also, the inside of the cage is filled with bone graft material which eventually fuses permanently with the adjacent vertebrae into a single unit.
- U.S. Pat. No. 4,961,740 to Ray, et al. entitled, “V-Thread Fusion Cage and Method of Fusing a Bone Joint,” discloses a fusion cage with a threaded outer surface, where the crown of the thread is sharp and cuts into the bone. Perforations are provided in valleys between adjacent turns of the thread.
- the cage can be screwed into a threaded bore provided in the bone structure at the surgical site and then packed with bone chips which promote fusion.
- U.S. Pat. No. 5,015,247 to Michelson entitled, “Threaded Spinal Implant,” discloses a fusion implant comprising a cylindrical member having a series of threads on the exterior of the cylindrical member for engaging the vertebrae to maintain the implant in place and a plurality of openings in the cylindrical surface.
- U.S. Pat. No. 6,342,074 to Simpson entitled, “Anterior Lumbar Underbody Fusion Implant and Method For Fusing Adjacent Vertebrae,” discloses a one-piece spinal fusion implant comprising a hollow body having an access passage for insertion of bone graft material into the intervertebral space after the implant has been affixed to adjacent vertebrae.
- the implant provides a pair of screw-receiving passages that are oppositely inclined relative to a central plane.
- the screw-receiving passages enable the head of an orthopaedic screw to be retained entirely within the access passage.
- U.S. Pat. No. 5,885,287 to Bagby entitled, “Self-tapping Interbody Bone Implant,” discloses a bone joining implant with a rigid, implantable base body having an outer surface with at least one bone bed engaging portion configured for engaging between a pair of bone bodies to be joined, wherein at least one spline is provided by the bone bed engaging portion, the spline being constructed and arranged to extend outwardly of the body and having an undercut portion.
- U.S. Pat. No. 6,582,467 to Teitelbaum et al. entitled,“Expandable Fusion Cage,” discloses an expandable fusion cage where the surfaces of the cage have multiple portions cut out of the metal to form sharp barbs. As the cage is expanded, the sharp barbs protrude into the subcortical bone of the vertebrae to secure the cage in place.
- the cage is filled with bone or bone matrix material.
- U.S. Pat. No. 5,800,550 to Sertich entitled, “Interbody Fusion Cage,” discloses a prosthetic device which includes an inert generally rectangularly shaped support body adapted to be seated on hard end plates of vertebrae.
- the support body has top and bottom faces.
- a first peg is movably mounted in a first aperture located in the support body, and the first aperture terminates at one of the top and bottom faces of the support body. Further, the first peg projects away from the one of the top and bottom faces and into an adjacent vertebra to secure the support body in place relative to the vertebra.
- U.S. Pat. No. 6,436,140 to Liu et al. entitled, “Expandable Interbody Fusion Cage and Method for Insertion,” discloses an expandable hollow interbody fusion device, wherein the body is divided into a number of branches connected to one another at a fixed end and separated at an expandable end.
- the expandable cage may be inserted in its substantially cylindrical form and may be expanded by movement of an expansion member to establish lordosis of the spine.
- An expansion member interacts with the interior surfaces of the device to maintain the cage in the expanded condition and provide a large internal chamber for receiving bone in-growth material.
- the present invention is a bone fusion device for insertion between bones that are to be fused together, such as, for example, the vertebrae of a spinal column.
- the bone fusion device comprises one or more extendable tabs.
- the bone fusion device is in its most compact state when the tabs are aligned with the body of the device such that the tabs lie within the exterior of the device.
- the bone fusion device is preferably inserted between the vertebrae by using an arthroscopic procedure.
- the bone fusion device of some embodiments is filled with bone graft material. In these embodiments, the bone graft material is typically relocated from the interior to the exterior of the bone fusion device by using a lead screw.
- each tab typically has an associated rotating means.
- the position of each tab relative to the bone fusion device is adjustable depending upon the configuration of the associated rotating means. In this way, the tabs are advantageously positioned in the confined space between the vertebrae to help brace the device until the bone has fused. Further, the tabs of the bone fusion device provide a larger surface area to which the bones attach and fuse during a healing period.
- the body of the bone fusion device is a round cylinder with end faces.
- the bone fusion device has conduits or holes that allow the bone graft material within the device to flow to the exterior of the device where the material contacts and grafts to the vertebrae.
- the extendable tabs are arranged in various configurations on the exterior of the bone fusion device, including the end faces.
- the tabs are attached to the body of the device on more than one side to optimally brace the device from multiple directions between the adjacent vertebrae.
- the bone fusion device has a rectangular shape with end faces and extendable tabs attached to multiple exterior surfaces.
- the bone fusion device of some embodiments includes protrusions, threading, and/or sharp features on the exterior surface and/or the extendable tabs. These features are configured to engage the adjacent vertebrae to provide a tighter interface between the device and the vertebrae.
- FIG. 1 illustrates a bone fusion device in accordance with some embodiments of the invention.
- FIG. 2 illustrates a bone fusion device according to an alternative embodiment of the present invention.
- FIGS. 3 A-B illustrate a section of a vertebral column showing the bone fusion device inserted between two adjacent vertebrae in place of an intervertebral disc.
- FIGS. 4 A-B illustrate a detailed view of the worm screw drive and the extendable tabs of some embodiments.
- FIGS. 5 A-B illustrate the small form factor of some embodiments.
- FIGS. 7 A-B are perspective drawings illustrating the tabs and tab bays of some embodiments.
- FIG. 8 illustrates a process flow in accordance with some embodiments of the invention.
- FIG. 1 illustrates a bone fusion device 100 in accordance with some embodiments of the invention.
- the bone fusion device 100 has a round cylindrical shape and has two end faces, including the end face 140 .
- the bone fusion device 100 is preferably constructed from a high strength biocompatible material, such as titanium, which has the strength to withstand compressive and shear forces in the spine that are generated by a patient's body weight and daily movements.
- the base biocompatible material is often textured or coated with a porous material conducive to the growth of new bone cells on the bone fusion device 100 .
- the end face 140 has an opening 145 which allows the insertion of bone graft material into the bone fusion device 100 .
- the bone graft material includes bone chips from the same patient (autograft), bone chips from a donor (allograft or xenograft), and/or a synthetic bone matrix.
- the bone graft material typically promotes bone growth during a recovery period after the patient receives bone fusion surgery.
- the bone fusion device 100 has several conduits or holes 150 , which permit the bone graft material to contact the vertebral bone after the device 100 has been inserted between the vertebrae of the patient.
- the bone graft material and the surface texturing of the device 100 encourage the growth and fusion of bone from the neighboring vertebrae.
- the fusion and healing process will result in the bone fusion device 100 becoming embedded within the two adjacent vertebrae of the spine which eventually fuse together during the healing period.
- tabs 131 , 132 , 133 , 134 , 135 , and 136 are distributed along the round cylindrical body of the bone fusion device 100 .
- These tabs 131 - 136 are each attached to the bone fusion device 100 by a respective rotating means 111 , 112 , 113 , 114 , 115 , and 116 .
- the rotating means 111 - 116 is typically a turn screw type assembly.
- the unextended tabs 121 - 126 of the bone fusion device 100 provide a compact assembly that is suitable for insertion into the patient's body through an arthroscopic surgical procedure.
- An arthroscopic procedure is considered minimally invasive and has certain advantages over more invasive conventional surgical procedures.
- a smaller surgical incision is employed as compared to the size of the incision required for conventional invasive surgery.
- arthroscopic procedures minimize or eliminate the need for excessive retraction of a patient's tissues such as muscles and nerves, thereby minimizing trauma and injury to the muscles and nerves and further reducing the patient's recovery time.
- each tab's 131 - 136 position is individually adjustable so as to optimally brace the device 100 between the vertebrae. Due to the compressive forces commonly associated with spinal column vertebrae, some embodiments include a range of motion for each tab that is slightly greater than 90 degrees.
- the tabs of these embodiments are preferably rotated to an angle that is slightly more than about 90 degrees with respect to the surface of the bone fusion device.
- the tabs extended in this configuration were found to be capable of withstanding the greatest amount of compressive force.
- the tabs 131 - 136 when extended, abut tightly against the surfaces of the vertebrae that are immediately adjacent to the bone fusion device 100 .
- the tabs 131 - 136 have sharp protrusions along the length of the tab for engaging the adjacent vertebrae, while the tabs 131 - 136 of some embodiments have screw-type threads for screwing into and engaging the vertebrae.
- the tabs of some embodiments have surface texturing to encourage and enhance the growth of new bone on the tabs 131 - 136 . This surface texturing is often similar to the surface texturing used on the main body of the device 100 .
- the tabs 131 - 136 advantageously wedge the bone fusion device 100 in a fixed position between the vertebrae and provide a larger surface area with which the adjacent vertebrae fuses during the healing period.
- bone growth material such as protein, is typically applied to the tabs 131 - 136 to stimulate the regeneration of bone cells needed for bone fusion. The application of bone growth material is described further in relation to FIG. 4 .
- the tabs of the device 100 have sharp ridges or threads which bite into the adjacent vertebrae, further helping to brace the device between the vertebrae.
- the body and the tabs 131 - 136 of the bone fusion device 100 employs different numbers and/or configurations of tabs in different embodiments.
- the tabs 131 - 136 depicted in FIG. 1 are merely exemplary.
- the tabs 131 - 136 are located anywhere over the exterior surface of the bone fusion device 100 , in a variety of orientations.
- the tabs 131 - 136 are preferably arranged such that when they are extended, the tabs 131 - 136 act to stabilize the bone fusion device 100 against the vertebrae from several points and directions. Typically, the tighter the bone fusion device 100 is wedged between the adjacent vertebrae by the tabs 131 - 136 , the more stability the device 100 provides to the vertebrae and the spine of the patient.
- the tabs 131 - 136 of the embodiments described above are critical to insure that the device 100 is not dislodged, since movement of the device 100 could cause serious injury to the patient, and especially because the inserted device is situated near the patient's spinal cord.
- FIG. 2 shows an alternative embodiment of the bone fusion device 200 .
- the bone fusion device 200 of some embodiments has a rectangular shape. Similar to the round cylindrical shaped bone fusion device 100 shown in FIG. 1 , the rectangular bone fusion device 200 has two end faces, including the end face 245 visible in FIG. 2 , and multiple tabs 211 , 212 , 213 , 214 , 215 , 216 , 217 , and 218 that are attached by rotating means to the exterior surface.
- the rotating means are screw type assemblies in some embodiments.
- the tabs 211 - 218 are also selectively extended after insertion of the bone fusion device 200 between the vertebrae.
- the insertion of the bone fusion device 200 and the extension of the selected tabs 211 - 218 are typically performed by a surgeon during an arthroscopic surgical procedure.
- the procedure of some embodiments is further described in relation to FIG. 8 .
- the rotation of a respective rotating means associated with each tab 211 - 218 individually adjusts the position of the associated tab 211 - 218 such that the device 200 is firmly braced between the two adjacent vertebrae.
- the tabs 211 - 218 are distributed over the exterior surfaces of the bone fusion device 200 in a variety of configurations, which include the ends and the surfaces of the device 200 that are not readily visible in FIG. 2 .
- different numbers of tabs 211 - 218 are distributed over each surface of the bone fusion device 200 of different embodiments.
- the surfaces of the bone fusion device 200 and/or the tabs 211 - 218 are coated with a porous surface texturing which promotes bone growth.
- the end face 245 has an opening 240 , which provides access to a cavity within the interior of the bone fusion device 200 .
- bone graft materials such as the bone chips and/or the synthetic bone matrix that were mentioned above, are pre-loaded into the cavity within the bone fusion device 200 through the opening 240 .
- conduits or holes 250 in the bone fusion device 200 permit the bone graft material to flow from the interior cavity to the exterior surfaces of the device 200 that are in contact with the vertebral bone.
- the bone graft material is relocated from the interior cavity to the exterior of the bone fusion device 200 , after the device 200 has been positioned between the vertebrae.
- FIG. 3A illustrates a section of a vertebral column that has a bone fusion device 300 positioned between two vertebrae 330 and 335 .
- the bone fusion device 300 is positioned in a location where an intervertebral disc would normally reside.
- a flexible disc is typically sandwiched between the two vertebrae of a normal healthy spinal column.
- the normal, healthy disc 340 is sandwiched between the vertebrae 337 and 330 .
- the intervertebral disc that normally resides between the vertebrae 330 and 335 has been excised and surgical insertion of the bone fusion device 300 has replaced the disc as the supporting structure between the vertebrae 330 and 335 .
- FIG. 3A further illustrates that the damaged disc that is normally sandwiched between vertebrae 330 and 335 has been totally removed.
- complete removal of the disc is not necessary in order to use the bone fusion device 300 of some embodiments.
- a sufficient amount of the disc is typically removed that allows access to the rotating means 311 , 312 , 313 , and 314 , which control the extension of the tabs 321 , 322 , 323 , and 324 , of the bone fusion device 300 .
- additional numbers and configurations of the tabs are distributed over the exterior surfaces of the bone fusion device 300 , including the surfaces that are not visible in FIG. 3A .
- the tabs 321 - 324 are deposed in a position aligned along the body of the bone fusion device 300 , such that the tabs 321 - 324 lie substantially within the exterior surfaces of the device 300 .
- the tabs 321 - 324 are flush with the exterior surface.
- the form factor of the bone fusion device 300 is configured to be as compact as possible.
- the form factor of some embodiments has a diameter of approximately 0.28 inches and a length of approximately 1.0 inch.
- the form factor of these same embodiments has a diameter of approximately 0.48 inches when the tabs 321 - 324 are fully extended.
- the cross-section of the bone fusion device 300 has different shapes in various embodiments.
- a more circular bone fusion device such as the device 100 illustrated in FIG. 1 , or a device having another shape is employed in conjunction with a set of extendable tabs that are located in various configurations in additional embodiments of the invention.
- some embodiments have four rows of tabs, where each row is positioned on a side of the bone fusion device. In some of these embodiments, each row preferably has four tabs.
- FIG. 3B a first set of four tabs 311 - 314 lock the bone fusion device 300 against the vertebra 330
- a second set of tabs 315 - 318 lock the bone fusion device 300 against the vertebra 335 .
- FIG. 4A illustrates the bone fusion device 400 of some embodiments in further detail.
- the bone fusion device 400 includes an interior cavity 405 for the insertion of a lead screw 415 , and one or more tabs 431 each deposed in a tab bay 421 , 422 , 423 , 424 .
- the tab bays 421 - 424 allow the tabs 431 to lie flush and/or within the exterior surface 420 of the bone fusion device 400 when not extended. Also when not extended, the tab 431 and tab bay 421 provides a conduit 450 from the interior cavity 405 to the exterior surface 420 of the bone fusion device 400 , such that the bone graft and/or growth material within the interior cavity 405 has a directed path to the exterior surface 420 . Typically, the insertion of the lead screw 415 forces the material within the interior cavity 405 to relocate to the exterior surface 420 .
- the tab 431 includes a rotating means 411 and gear teeth 455 .
- the gear teeth 455 provide a series of passive grooves by which the lead screw 415 traverses the interior cavity 405 .
- the tab 431 remains fixed as the lead screw 415 is screwed into the interior cavity 405 .
- the threading of the lead screw 415 does not address or affect the gear teeth 455 during the insertion of the lead screw 415 .
- the rotating means 411 is turned to raise the tab 431 .
- the rotating means 411 for the tab 431 typically comprises a turn screw type mechanism such that when the rotating means 411 is turned, the gear teeth 455 drive or rotate against the stationary threads of the inserted lead screw 415 . Similarly, due to the angle of the stationary lead screw's spiral threads, the gear teeth 455 cause the tab 431 to elevate and extend above the exterior surface 420 of the bone fusion device 400 .
- the tabs 431 of some embodiments have a range of motion that exceeds 90 degrees with respect to the exterior surface 420 of the bone fusion device 400 . Accordingly, FIG. 4B illustrates the tab 431 extended slightly past 90 degrees, which is the optimum position to withstand the compressive force exerted on the vertebrae of some embodiments.
- FIG. 5A illustrates a closed view of the small form factor for a bone fusion device 500 in accordance with some embodiments.
- the bone fusion device 500 has a tab 531 that is not extended and lies within the exterior surface of the device 500 .
- FIG. 5B illustrates the form factor for the bone fusion device 500 with the tab 531 extended, as described above.
- FIG. 6A illustrates a cross section view of the bone fusion device 600 having a small form factor, while FIG. 6B illustrates the cross section view with the tab 631 extended.
- FIG. 7A is a perspective drawing illustrating the bone fusion device 700 with four tab bays on four opposite sides of the device 700 , according to some embodiments of the invention.
- a tab is deposed in each tab bay and secured by a rotating means.
- the tab 731 is deposed in the tab bay 721 and secured by the rotating means 711 .
- a lead screw 715 is preferably driven into the cavity.
- the lead screw 715 provides the thread by which the gear teeth 755 elevate the tabs 731 - 733 .
- FIG. 7B illustrates the bone fusion device 700 with the tabs 731 - 733 elevated.
- FIG. 8 is a process flow diagram that summarizes the insertion and use of the bone fusion device according to some embodiments.
- the process 800 begins at the step 805 where a small, minimally invasive surgical incision is performed.
- the small incision is typically only large enough to permit entry of an arthroscopic surgical tool.
- the process 800 transitions to the step 810 , where the bone fusion device is inserted through the small incision and delivered to a region between two vertebrae that are to be fused together. Insertion and delivery of the bone fusion device are preferably performed by using arthroscopic tool(s).
- the bone fusion device is positioned in the region where bone fusion is to occur, also typically by using one or more arthroscopic tool(s).
- the process 800 transitions to the step 820 , where the lead screw is inserted and driven into the bone fusion device.
- the lead screw is typically driven into a cavity in the center of the bone fusion device.
- the cavity contains a bone growth material comprising collagen and/or a matrix for the promotion of bone growth. Accordingly, insertion of the lead screw into the cavity causes the bone growth material to be relocated from the interior cavity to the exterior surface of the bone growth device.
- the bone fusion device of some embodiments has a particular pattern of conduits or pores that extend from the interior cavity to the exterior surface for facilitating the relocation of bone growth material to particular locations at the exterior of the device. For instance, some embodiments have pores that facilitate the relocation of bone growth material to particular tabs.
- the tabs are selectively extended to lock the bone fusion device in place in the region between the two vertebrae.
- the tabs of some embodiments are extended by using the worm screw drive mechanism described above in relation to FIG. 4 .
- the small incision and minimally invasive (arthroscopic) surgical procedure advantageously promote health and rapid recovery by the patient.
- bone growth occurs around the bone fusion device and particularly at the locations of the extended tabs, such that the bone fusion device is further secured by the bone growth, which further promotes a superior, robust bone fusion result.
Abstract
A bone fusion device provides stability to bones during a bone fusion period. The bones include, for example, the vertebrae of a spinal column. The bone fusion device comprises one or more extendable tabs attached to the bone fusion device by associated rotating means. The bone fusion device is preferably inserted by using an arthroscopic surgical procedure. During arthroscopic insertion of the device, the tabs are pre-configured for compactness. In this compact configuration, the tabs are preferably deposed along and/or within an exterior surface of the bone fusion device. After the bone fusion device has been positioned between the bones, one or more tab(s) are extended. In some embodiments, the position of each tab relative to the bone fusion device is adjustable. Typically, the tabs advantageously position and brace the bone fusion device in the confined space between the bones until the bones have fused.
Description
- This patent application claims priority under 35 U.S.C. § 119(e) of the co-pending U.S. Provisional Patent Application, Ser. No. 60/624,836, filed Nov. 03, 2004, and entitled “BONE FUSION DEVICE,” which is hereby incorporated by reference in its entirety.
- This invention relates generally to bone fusion devices. More specifically, the present invention relates to devices for fusing vertebrae of the spine that can be inserted arthroscopically.
- The spinal column is made up of vertebrae stacked on top of one another. Between the vertebrae are discs which are gel-like cushions that act as shock-absorbers and keep the spine flexible. Injury, disease, or excessive pressure on the discs can cause degenerative disc disease or other disorders where the disc becomes thinner and allows the vertebrae to move closer together or become misaligned. As a result, nerves may become pinched, causing pain that radiates into other parts of the body, or instability of the vertebrae may ensue.
- One method for correcting disc-related disorders is to insert a fusion cage between the vertebrae to act as a structural replacement for the deteriorated disc. The fusion cage is typically a hollow metal device usually made of titanium. Once inserted, the fusion cage maintains the proper separation between the vertebrae to prevent nerves from being pinched and provides structural stability to the spine. Also, the inside of the cage is filled with bone graft material which eventually fuses permanently with the adjacent vertebrae into a single unit.
- The use of fusion cages for fusion and stabilization of vertebrae in the spine is known in the prior art. U.S. Pat. No. 4,961,740 to Ray, et al. entitled, “V-Thread Fusion Cage and Method of Fusing a Bone Joint,” discloses a fusion cage with a threaded outer surface, where the crown of the thread is sharp and cuts into the bone. Perforations are provided in valleys between adjacent turns of the thread. The cage can be screwed into a threaded bore provided in the bone structure at the surgical site and then packed with bone chips which promote fusion.
- U.S. Pat. No. 5,015,247 to Michelson entitled, “Threaded Spinal Implant,” discloses a fusion implant comprising a cylindrical member having a series of threads on the exterior of the cylindrical member for engaging the vertebrae to maintain the implant in place and a plurality of openings in the cylindrical surface.
- U.S. Pat. No. 6,342,074 to Simpson entitled, “Anterior Lumbar Underbody Fusion Implant and Method For Fusing Adjacent Vertebrae,” discloses a one-piece spinal fusion implant comprising a hollow body having an access passage for insertion of bone graft material into the intervertebral space after the implant has been affixed to adjacent vertebrae. The implant provides a pair of screw-receiving passages that are oppositely inclined relative to a central plane. In one embodiment, the screw-receiving passages enable the head of an orthopaedic screw to be retained entirely within the access passage.
- U.S. Pat. No. 5,885,287 to Bagby entitled, “Self-tapping Interbody Bone Implant,” discloses a bone joining implant with a rigid, implantable base body having an outer surface with at least one bone bed engaging portion configured for engaging between a pair of bone bodies to be joined, wherein at least one spline is provided by the bone bed engaging portion, the spline being constructed and arranged to extend outwardly of the body and having an undercut portion.
- U.S. Pat. No. 6,582,467 to Teitelbaum et al. entitled,“Expandable Fusion Cage,” discloses an expandable fusion cage where the surfaces of the cage have multiple portions cut out of the metal to form sharp barbs. As the cage is expanded, the sharp barbs protrude into the subcortical bone of the vertebrae to secure the cage in place. The cage is filled with bone or bone matrix material.
- U.S. Pat. No. 5,800,550 to Sertich entitled, “Interbody Fusion Cage,” discloses a prosthetic device which includes an inert generally rectangularly shaped support body adapted to be seated on hard end plates of vertebrae. The support body has top and bottom faces. A first peg is movably mounted in a first aperture located in the support body, and the first aperture terminates at one of the top and bottom faces of the support body. Further, the first peg projects away from the one of the top and bottom faces and into an adjacent vertebra to secure the support body in place relative to the vertebra.
- U.S. Pat. No. 6,436,140 to Liu et al. entitled, “Expandable Interbody Fusion Cage and Method for Insertion,” discloses an expandable hollow interbody fusion device, wherein the body is divided into a number of branches connected to one another at a fixed end and separated at an expandable end. The expandable cage may be inserted in its substantially cylindrical form and may be expanded by movement of an expansion member to establish lordosis of the spine. An expansion member interacts with the interior surfaces of the device to maintain the cage in the expanded condition and provide a large internal chamber for receiving bone in-growth material.
- These patents all disclose fusion cage devices that can be inserted between vertebrae of the spine in an invasive surgical procedure. Such an invasive surgical procedure requires a long recovery period.
- The present invention is a bone fusion device for insertion between bones that are to be fused together, such as, for example, the vertebrae of a spinal column. The bone fusion device comprises one or more extendable tabs. The bone fusion device is in its most compact state when the tabs are aligned with the body of the device such that the tabs lie within the exterior of the device. In this compact form, the bone fusion device is preferably inserted between the vertebrae by using an arthroscopic procedure. The bone fusion device of some embodiments is filled with bone graft material. In these embodiments, the bone graft material is typically relocated from the interior to the exterior of the bone fusion device by using a lead screw. After the device has been positioned between the vertebrae, and the lead screw is inserted to optionally deliver the bone graft material, selected tabs are extended. Each tab typically has an associated rotating means. The position of each tab relative to the bone fusion device is adjustable depending upon the configuration of the associated rotating means. In this way, the tabs are advantageously positioned in the confined space between the vertebrae to help brace the device until the bone has fused. Further, the tabs of the bone fusion device provide a larger surface area to which the bones attach and fuse during a healing period.
- According to an embodiment of the present invention, the body of the bone fusion device is a round cylinder with end faces. The bone fusion device has conduits or holes that allow the bone graft material within the device to flow to the exterior of the device where the material contacts and grafts to the vertebrae. The extendable tabs are arranged in various configurations on the exterior of the bone fusion device, including the end faces. Preferably, the tabs are attached to the body of the device on more than one side to optimally brace the device from multiple directions between the adjacent vertebrae. Alternatively, the bone fusion device has a rectangular shape with end faces and extendable tabs attached to multiple exterior surfaces.
- Optionally, the bone fusion device of some embodiments includes protrusions, threading, and/or sharp features on the exterior surface and/or the extendable tabs. These features are configured to engage the adjacent vertebrae to provide a tighter interface between the device and the vertebrae.
-
FIG. 1 illustrates a bone fusion device in accordance with some embodiments of the invention. -
FIG. 2 illustrates a bone fusion device according to an alternative embodiment of the present invention. - FIGS. 3A-B illustrate a section of a vertebral column showing the bone fusion device inserted between two adjacent vertebrae in place of an intervertebral disc.
- FIGS. 4A-B illustrate a detailed view of the worm screw drive and the extendable tabs of some embodiments.
- FIGS. 5A-B illustrate the small form factor of some embodiments.
- FIGS. 6A-B illustrate a cross section view of the small form factor of some embodiments.
- FIGS. 7A-B are perspective drawings illustrating the tabs and tab bays of some embodiments.
-
FIG. 8 illustrates a process flow in accordance with some embodiments of the invention. - In the following description, numerous details and alternatives are set forth for purpose of explanation. However, one of ordinary skill in the art will realize that the invention can be practiced without the use of these specific details. For instance, the figures and description below often refer to the vertebral bones of a spinal column. However, one of ordinary skill in the art will recognize that some embodiments of the invention are practiced for the fusion of other bones, including broken bones and/or joints. In other instances, well-known structures and devices are shown in block diagram form in order not to obscure the description of the invention with unnecessary detail.
-
FIG. 1 illustrates abone fusion device 100 in accordance with some embodiments of the invention. As shown in this figure, thebone fusion device 100 has a round cylindrical shape and has two end faces, including theend face 140. Thebone fusion device 100 is preferably constructed from a high strength biocompatible material, such as titanium, which has the strength to withstand compressive and shear forces in the spine that are generated by a patient's body weight and daily movements. The base biocompatible material is often textured or coated with a porous material conducive to the growth of new bone cells on thebone fusion device 100. - Also shown in
FIG. 1 , theend face 140 has anopening 145 which allows the insertion of bone graft material into thebone fusion device 100. The bone graft material includes bone chips from the same patient (autograft), bone chips from a donor (allograft or xenograft), and/or a synthetic bone matrix. The bone graft material typically promotes bone growth during a recovery period after the patient receives bone fusion surgery. As further illustrated inFIG. 1 , thebone fusion device 100 has several conduits or holes 150, which permit the bone graft material to contact the vertebral bone after thedevice 100 has been inserted between the vertebrae of the patient. The bone graft material and the surface texturing of thedevice 100 encourage the growth and fusion of bone from the neighboring vertebrae. The fusion and healing process will result in thebone fusion device 100 becoming embedded within the two adjacent vertebrae of the spine which eventually fuse together during the healing period. - As further illustrated in
FIG. 1 ,several tabs bone fusion device 100. These tabs 131-136 are each attached to thebone fusion device 100 by a respectiverotating means bone fusion device 100 is inserted into the patient's body, the tabs 131-136 lie along the body of thedevice 100, as shown by the dotted outlines 121-126 of the tabs. Thus, the unextended tabs 121-126 of thebone fusion device 100 provide a compact assembly that is suitable for insertion into the patient's body through an arthroscopic surgical procedure. An arthroscopic procedure is considered minimally invasive and has certain advantages over more invasive conventional surgical procedures. In an arthroscopic procedure, a smaller surgical incision is employed as compared to the size of the incision required for conventional invasive surgery. Moreover, arthroscopic procedures minimize or eliminate the need for excessive retraction of a patient's tissues such as muscles and nerves, thereby minimizing trauma and injury to the muscles and nerves and further reducing the patient's recovery time. - After insertion of the
device 100 into the space between the patient's vertebrae, the surgeon selectively extends particular tabs 131-136 by rotating each selected tab's respective rotating means 111-116. The more each rotating means 111-116 is rotated, the farther its respective tab 131-136 elevates and extends outward from its initial position 121-126 along the body of thedevice 100. Each tab's 131-136 position is individually adjustable so as to optimally brace thedevice 100 between the vertebrae. Due to the compressive forces commonly associated with spinal column vertebrae, some embodiments include a range of motion for each tab that is slightly greater than 90 degrees. It was particularly discovered during the reduction to practice of the present invention, that the tabs of these embodiments are preferably rotated to an angle that is slightly more than about 90 degrees with respect to the surface of the bone fusion device. The tabs extended in this configuration were found to be capable of withstanding the greatest amount of compressive force. - Preferably, the tabs 131-136, when extended, abut tightly against the surfaces of the vertebrae that are immediately adjacent to the
bone fusion device 100. In some embodiments, the tabs 131-136 have sharp protrusions along the length of the tab for engaging the adjacent vertebrae, while the tabs 131-136 of some embodiments have screw-type threads for screwing into and engaging the vertebrae. Optionally, the tabs of some embodiments have surface texturing to encourage and enhance the growth of new bone on the tabs 131-136. This surface texturing is often similar to the surface texturing used on the main body of thedevice 100. Regardless of their texturing and/or particular physical characteristics, the tabs 131-136 advantageously wedge thebone fusion device 100 in a fixed position between the vertebrae and provide a larger surface area with which the adjacent vertebrae fuses during the healing period. Moreover, bone growth material, such as protein, is typically applied to the tabs 131-136 to stimulate the regeneration of bone cells needed for bone fusion. The application of bone growth material is described further in relation toFIG. 4 . - In an alternative embodiment of the invention, the tabs of the
device 100 have sharp ridges or threads which bite into the adjacent vertebrae, further helping to brace the device between the vertebrae. It will be readily apparent to one skilled in the art that there are a number of variations for the body and the tabs 131-136 of thebone fusion device 100. For instance, thebone fusion device 100 employs different numbers and/or configurations of tabs in different embodiments. Hence, the tabs 131-136 depicted inFIG. 1 are merely exemplary. Moreover, the tabs 131-136 are located anywhere over the exterior surface of thebone fusion device 100, in a variety of orientations. Specifically, the tabs 131-136 are preferably arranged such that when they are extended, the tabs 131-136 act to stabilize thebone fusion device 100 against the vertebrae from several points and directions. Typically, the tighter thebone fusion device 100 is wedged between the adjacent vertebrae by the tabs 131-136, the more stability thedevice 100 provides to the vertebrae and the spine of the patient. The tabs 131-136 of the embodiments described above are critical to insure that thedevice 100 is not dislodged, since movement of thedevice 100 could cause serious injury to the patient, and especially because the inserted device is situated near the patient's spinal cord. -
FIG. 2 shows an alternative embodiment of thebone fusion device 200. As shown in this figure, thebone fusion device 200 of some embodiments has a rectangular shape. Similar to the round cylindrical shapedbone fusion device 100 shown inFIG. 1 , the rectangularbone fusion device 200 has two end faces, including theend face 245 visible inFIG. 2 , andmultiple tabs bone fusion device 200 between the vertebrae. As before, the insertion of thebone fusion device 200 and the extension of the selected tabs 211-218, are typically performed by a surgeon during an arthroscopic surgical procedure. The procedure of some embodiments is further described in relation toFIG. 8 . The rotation of a respective rotating means associated with each tab 211-218, individually adjusts the position of the associated tab 211-218 such that thedevice 200 is firmly braced between the two adjacent vertebrae. One skilled in the art will recognize that the tabs 211-218 are distributed over the exterior surfaces of thebone fusion device 200 in a variety of configurations, which include the ends and the surfaces of thedevice 200 that are not readily visible inFIG. 2 . Moreover, as mentioned above, different numbers of tabs 211-218 are distributed over each surface of thebone fusion device 200 of different embodiments. In some embodiments, the surfaces of thebone fusion device 200 and/or the tabs 211-218, are coated with a porous surface texturing which promotes bone growth. - Preferably, the
end face 245 has anopening 240, which provides access to a cavity within the interior of thebone fusion device 200. In some embodiments, bone graft materials, such as the bone chips and/or the synthetic bone matrix that were mentioned above, are pre-loaded into the cavity within thebone fusion device 200 through theopening 240. Several conduits or holes 250 in thebone fusion device 200 permit the bone graft material to flow from the interior cavity to the exterior surfaces of thedevice 200 that are in contact with the vertebral bone. Typically, the bone graft material is relocated from the interior cavity to the exterior of thebone fusion device 200, after thedevice 200 has been positioned between the vertebrae. However, in some embodiments the bone graft material is delivered to the site of thebone fusion device 200 by arthroscopic means that originate external to thedevice 200. Regardless of the delivery means, the bone graft material and the surface texturing of thebone fusion device 200 encourage bone growth and fusion with the adjacent vertebrae that are in contact with thedevice 200. As bone fusion and healing progresses, thebone fusion device 200 preferably becomes embedded within the two fused vertebrae of the spine. -
FIG. 3A illustrates a section of a vertebral column that has abone fusion device 300 positioned between twovertebrae bone fusion device 300 is positioned in a location where an intervertebral disc would normally reside. A flexible disc is typically sandwiched between the two vertebrae of a normal healthy spinal column. For instance, the normal,healthy disc 340 is sandwiched between thevertebrae FIG. 3 , the intervertebral disc that normally resides between thevertebrae bone fusion device 300 has replaced the disc as the supporting structure between thevertebrae -
FIG. 3A further illustrates that the damaged disc that is normally sandwiched betweenvertebrae bone fusion device 300 of some embodiments. Typically, only as much of the disc needs to be excised as is required to permit the placement and positioning of thebone fusion device 300. Additionally, a sufficient amount of the disc is typically removed that allows access to therotating means tabs bone fusion device 300. As mentioned above, additional numbers and configurations of the tabs are distributed over the exterior surfaces of thebone fusion device 300, including the surfaces that are not visible inFIG. 3A . - Preferably, during the insertion and placement of the
bone fusion device 300, the tabs 321-324 are deposed in a position aligned along the body of thebone fusion device 300, such that the tabs 321-324 lie substantially within the exterior surfaces of thedevice 300. In some embodiments, the tabs 321-324 are flush with the exterior surface. In these embodiments, the form factor of thebone fusion device 300 is configured to be as compact as possible. For instance, the form factor of some embodiments has a diameter of approximately 0.28 inches and a length of approximately 1.0 inch. In contrast, the form factor of these same embodiments has a diameter of approximately 0.48 inches when the tabs 321-324 are fully extended. - By minimizing the space occupied, the
bone fusion device 300 is advantageously inserted arthroscopically into the patient's body. If instead, thedevice 300 were inserted in its fully extended form, a larger surgical incision would be required, and a greater displacement of the muscles and nerves would be needed. However, its compact form factor allows thebone fusion device 300 to be inserted by advantageously utilizing minimally invasive arthroscopic techniques. Then, the tabs 321-324 of thebone fusion device 300 are extended after arthroscopic insertion to optimally increase the form factor and brace thedevice 300 between thevertebrae - While the particular embodiment described above has a rectangular shape, it will be readily apparent to one skilled in the art that the cross-section of the
bone fusion device 300 has different shapes in various embodiments. For instance, a more circular bone fusion device such as thedevice 100 illustrated inFIG. 1 , or a device having another shape is employed in conjunction with a set of extendable tabs that are located in various configurations in additional embodiments of the invention. For instance, some embodiments have four rows of tabs, where each row is positioned on a side of the bone fusion device. In some of these embodiments, each row preferably has four tabs. Such an embodiment is further described in relation toFIG. 7 and is illustrated in its inserted form inFIG. 3B . As shown inFIG. 3B , a first set of four tabs 311-314 lock thebone fusion device 300 against thevertebra 330, while a second set of tabs 315-318 lock thebone fusion device 300 against thevertebra 335. -
FIG. 4A illustrates thebone fusion device 400 of some embodiments in further detail. As shown in this figure, thebone fusion device 400 includes aninterior cavity 405 for the insertion of alead screw 415, and one ormore tabs 431 each deposed in atab bay - The tab bays 421-424 allow the
tabs 431 to lie flush and/or within theexterior surface 420 of thebone fusion device 400 when not extended. Also when not extended, thetab 431 andtab bay 421 provides aconduit 450 from theinterior cavity 405 to theexterior surface 420 of thebone fusion device 400, such that the bone graft and/or growth material within theinterior cavity 405 has a directed path to theexterior surface 420. Typically, the insertion of thelead screw 415 forces the material within theinterior cavity 405 to relocate to theexterior surface 420. - The
tab 431 includes arotating means 411 andgear teeth 455. When thetab 431 is not extended, thegear teeth 455 provide a series of passive grooves by which thelead screw 415 traverses theinterior cavity 405. Typically, thetab 431 remains fixed as thelead screw 415 is screwed into theinterior cavity 405. In these embodiments, the threading of thelead screw 415 does not address or affect thegear teeth 455 during the insertion of thelead screw 415. - However, the
gear teeth 455 do employ the threading of thelead screw 415 when thelead screw 415 has been fully inserted into thecavity 405, in some embodiments. For instance, in a particular implementation of the invention, thelead screw 415 is driven into thecavity 405, until it reaches anendcap 406. Theendcap 406 allows thelead screw 415 to continue rotating in place, but does not allow thelead screw 415 to continue its forward progress through thecavity 405. When thelead screw 415 of these embodiments rotates without making forward progress, the rotating lead screw's threading contacts and engages thegear teeth 455 of eachtab 431. Accordingly, the motion and angle of the spiraling threads, when applied against thegear teeth 455, causes thetabs 431 to elevate and extend. The combination of thegear teeth 455 on thetabs 431 and the insertedlead screw 415, is referred to, in some embodiments, as a worm screw drive mechanism. - In an alternative embodiment of the worm screw drive mechanism, the rotating means 411 is turned to raise the
tab 431. In these embodiments, the rotating means 411 for thetab 431 typically comprises a turn screw type mechanism such that when therotating means 411 is turned, thegear teeth 455 drive or rotate against the stationary threads of the insertedlead screw 415. Similarly, due to the angle of the stationary lead screw's spiral threads, thegear teeth 455 cause thetab 431 to elevate and extend above theexterior surface 420 of thebone fusion device 400. - As mentioned above, the
tabs 431 of some embodiments have a range of motion that exceeds 90 degrees with respect to theexterior surface 420 of thebone fusion device 400. Accordingly,FIG. 4B illustrates thetab 431 extended slightly past 90 degrees, which is the optimum position to withstand the compressive force exerted on the vertebrae of some embodiments. -
FIG. 5A illustrates a closed view of the small form factor for abone fusion device 500 in accordance with some embodiments. As shown in this figure, thebone fusion device 500 has atab 531 that is not extended and lies within the exterior surface of thedevice 500. In contrast,FIG. 5B illustrates the form factor for thebone fusion device 500 with thetab 531 extended, as described above. Similarly,FIG. 6A illustrates a cross section view of thebone fusion device 600 having a small form factor, whileFIG. 6B illustrates the cross section view with thetab 631 extended. -
FIG. 7A is a perspective drawing illustrating thebone fusion device 700 with four tab bays on four opposite sides of thedevice 700, according to some embodiments of the invention. As described above, a tab is deposed in each tab bay and secured by a rotating means. For instance, thetab 731 is deposed in thetab bay 721 and secured by the rotatingmeans 711. Also shown inFIG. 7A , alead screw 715 is preferably driven into the cavity. As described above, thelead screw 715 provides the thread by which thegear teeth 755 elevate the tabs 731-733. Accordingly,FIG. 7B illustrates thebone fusion device 700 with the tabs 731-733 elevated. -
FIG. 8 is a process flow diagram that summarizes the insertion and use of the bone fusion device according to some embodiments. As shown in this figure, theprocess 800 begins at thestep 805 where a small, minimally invasive surgical incision is performed. The small incision is typically only large enough to permit entry of an arthroscopic surgical tool. Then, theprocess 800 transitions to thestep 810, where the bone fusion device is inserted through the small incision and delivered to a region between two vertebrae that are to be fused together. Insertion and delivery of the bone fusion device are preferably performed by using arthroscopic tool(s). - At the
step 815, the bone fusion device is positioned in the region where bone fusion is to occur, also typically by using one or more arthroscopic tool(s). Once the bone fusion device is positioned in the region between the two vertebrae, theprocess 800 transitions to thestep 820, where the lead screw is inserted and driven into the bone fusion device. The lead screw is typically driven into a cavity in the center of the bone fusion device. Preferably, the cavity contains a bone growth material comprising collagen and/or a matrix for the promotion of bone growth. Accordingly, insertion of the lead screw into the cavity causes the bone growth material to be relocated from the interior cavity to the exterior surface of the bone growth device. The bone fusion device of some embodiments has a particular pattern of conduits or pores that extend from the interior cavity to the exterior surface for facilitating the relocation of bone growth material to particular locations at the exterior of the device. For instance, some embodiments have pores that facilitate the relocation of bone growth material to particular tabs. - At the
step 825 of theFIG. 8 , the tabs are selectively extended to lock the bone fusion device in place in the region between the two vertebrae. The tabs of some embodiments are extended by using the worm screw drive mechanism described above in relation toFIG. 4 . Once the selected tabs are extended and the bone fusion device is secured in place at thestep 825, the surgical tools are removed from the patient, and the small incision is sutured. Then, theprocess 800 concludes. - As mentioned above, the small incision and minimally invasive (arthroscopic) surgical procedure advantageously promote health and rapid recovery by the patient. Preferably, bone growth occurs around the bone fusion device and particularly at the locations of the extended tabs, such that the bone fusion device is further secured by the bone growth, which further promotes a superior, robust bone fusion result.
- The present invention has been described in terms of specific embodiments incorporating details to facilitate the understanding of principles of construction and operation of the invention. Such reference herein to specific embodiments and details thereof is not intended to limit the scope of the claims appended hereto. It will be apparent to those skilled in the art that modification may be made in the embodiments chosen for illustration without departing from the spirit and scope of the invention.
Claims (38)
1. A bone fusion device for insertion between bones comprising:
first and second ends;
an interior cavity deposed between the first and second ends;
an exterior surface;
a conduit providing a pathway from the interior cavity to the exterior surface; and
one or more tabs for bracing the bone fusion device in a space between the bones, wherein the one or more tabs comprise an adjustable element.
2. The bone fusion device of claim 1 , wherein the adjustable element is collapsible to a compact position deposed within the exterior surface such that the bone fusion device has a minimized form factor.
3. The bone fusion device of claim 1 , wherein the adjustable element is configured for a plurality of positions.
4. The bond fusion device of claim 1 , wherein the adjustable element has a range of motion that is greater than 90 degrees with respect to the exterior surface of the bone fusion device.
5. The bone fusion device of claim 1 , wherein the adjustable element is configured for a position slightly more than 90 degrees with respect to the exterior surface.
6. The bone fusion device of claim 1 , wherein the adjustable element comprises an independent extendable tab, wherein the independent extendable tab is separately configured.
7. The bone fusion device of claim 1 , further comprising a bone graft material pre-deposited into the interior cavity before insertion of the bone fusion device between the bones.
8. The bone fusion device of claim 1 , further comprising a lead screw driven into the interior cavity, wherein driving the lead screw into the interior cavity relocates a bone growth material from the interior cavity to the exterior surface.
9. The bone fusion device of claim 1 , further comprising a worm screw drive mechanism such that driving a lead screw into the interior cavity modifies the configuration for a tab among the one or more tabs.
10. The bone fusion device of claim 1 , further comprising a bone graft material that is applied after placement of the bone fusion device between the bones.
11. The bone fusion device of claim 1 , further comprising one or more protrusions configured for engaging the bones.
12. The bone fusion device of claim 1 , further comprising a cylinder.
13. The bone fusion device of claim 1 , further comprising a rectangular shape.
14. The bone fusion device of claim 1 , wherein a material of the bone fusion device is biocompatible.
15. The bone fusion device of claim 1 , wherein the bone fusion device is configured for insertion by using an arthroscopic procedure.
16. The bone fusion device of claim 1 , wherein the bones comprise vertebral bones.
17. A bone fusion device for insertion between adjacent bones, comprising:
a. a hollow body having one or more holes along a length of the body; and
b. one or more extendable tabs each attached to the hollow body by a screw,
wherein the one or more extendable tabs are aligned along a surface of the hollow body in a compact position during insertion into a patient.
18. The bone fusion device of claim 16 , wherein the one or more tabs are individually adjustable to a desired position after insertion for bracing the bone fusion device between the adjacent bones.
19. The bone fusion device of claim 18 , wherein the tabs are adjusted by a rotation of the screw.
20. The bone fusion device as claimed in claim 15 , wherein an extendable tab is deposed to lie within the exterior surface of the bone fusion device such that the bone fusion device has a small form factor.
21. The bone fusion device as claimed in claim 15 , wherein an extendable tab is attached to the hollow body on an end face.
22. The bone fusion device as claimed in claim 15 , wherein the bones comprise vertebrae, wherein a material of the bone fusion device is biocompatible.
23. The bone fusion device as claimed in claim 15 , wherein bone graft material is present within the hollow body before insertion between the bones.
24. The bone fusion device as claimed in claim 15 , wherein bone graft material is applied after insertion and placement between the bones.
25. The bone fusion device as claimed in claim 15 , wherein an extendable tab has a sharp protrusion configured to engage the adjacent bones.
26. The bone fusion device as claimed in claim 15 , wherein an extendable tab has threading configured to engage the adjacent bones.
27. The bone fusion device as claimed in claim 15 , wherein an extendable tab has a textured surface.
28. The bone fusion device as claimed in claim 15 , wherein an extendable tab is coated with a porous material.
29. A method of implanting a bone fusion device between bones, the method comprising:
inserting the bone fusion device between the bones, wherein the bone fusion device comprises an internal cavity, an exterior surface, and an extendable tab, wherein the extendable tab comprises an associated rotating element;
pre-configuring the extendable tab to lie within the exterior surface by using the rotating element such that the bone fusion device has a minimized form factor;
driving a lead screw into the cavity; and
extending the tab to a desired position by using the rotating element.
30. The method of claim 28 , further comprising selecting the tab.
31. The method of claim 28 , wherein extending the tab comprises turning the rotating element associated with the tab to elevate the tab.
32. The method of claim 28 , wherein the bone fusion device comprises a worm screw drive mechanism such that driving the lead screw into the cavity past a predetermine point elevates the tab by using the rotating element.
33. The method of claim 28 , wherein the desired position comprises an angle of slightly greater than approximately 90 degrees with respect to an exterior surface of the bone fusion device.
34. The method of claim 28 , further comprising before implantation, depositing a bone graft material into the cavity.
35. The method of claim 28 , further comprising applying bone growth material to the tab after extension, wherein the bone growth material stimulates regeneration of bone cells in the bones.
36. The method of claim 28 , wherein driving the lead screw relocates a bone graft material from the interior to the exterior of the bone fusion device.
37. The method of claim 28 , wherein the bones comprise vertebrae.
38. The method of claim 28 , wherein inserting the bone fusion device comprises an arthroscopic procedure.
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US14/885,777 US9974665B2 (en) | 2004-11-03 | 2015-10-16 | Bone fusion device |
US15/954,414 US10682240B2 (en) | 2004-11-03 | 2018-04-16 | Bone fusion device |
US16/798,098 US11583414B2 (en) | 2004-11-03 | 2020-02-21 | Bone fusion device |
US18/111,561 US20230201005A1 (en) | 2004-11-03 | 2023-02-18 | Bone fusion device |
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WO2006050500A3 (en) | 2006-09-28 |
US20060253201A1 (en) | 2006-11-09 |
US8187332B2 (en) | 2012-05-29 |
US7727280B2 (en) | 2010-06-01 |
US20060142859A1 (en) | 2006-06-29 |
WO2006050500A2 (en) | 2006-05-11 |
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