Expandable spacer and method of use thereof
First Claim
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1. A method for facilitating fusion of two adjacent joint surfaces in a patient comprising the steps of:
- accessing a site in the patient'"'"'s body having two adjacent joint surfaces to be fused;
providing an expandable implant having a first, collapsed height;
preparing a space between the two adjacent joint surfaces for insertion of the implant;
inserting the implant into the prepared space;
wherein the expandable implant comprises;
a first and a second threaded shaft;
a first gear and a second gear;
a base plate, the first and second gears are rotatably and non-translatable coupled to the base plate; and
the first and second gears operably coupled with the first and second threaded shafts, said first and second gear having interior surfaces including threads matably engaged with said first and second threaded shafts, whereby rotation of said first and second gears initiates displacement of said first and second threaded shafts, whereby said first and second threaded shafts are extendable in a direction away from said base plate;
wherein the first and second shafts are coupled to a top plate,wherein the first and second gears are positioned substantially perpendicular to the base plate and adjacent to one another,wherein the first and second gears engage with each other,expanding the expandable implant; and
closing the site in the patient'"'"'s body.
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Abstract
An expandable implant is disclosed having an adjustable height for insertion between two adjacent bony structures or joint surfaces, for example between two adjacent spinal vertebrae. The implant includes at least one gear associated with at least one threaded shaft. Rotation of the gear engages the threaded shaft to expand the implant. The implant can be inserted in a collapsed configuration and expanded in situ. The invention also provides methods for using the implant to facilitate arthrodesis or fusion of adjacent joint surfaces or spinal vertebrae.
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Citations
15 Claims
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1. A method for facilitating fusion of two adjacent joint surfaces in a patient comprising the steps of:
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accessing a site in the patient'"'"'s body having two adjacent joint surfaces to be fused; providing an expandable implant having a first, collapsed height; preparing a space between the two adjacent joint surfaces for insertion of the implant; inserting the implant into the prepared space; wherein the expandable implant comprises; a first and a second threaded shaft; a first gear and a second gear; a base plate, the first and second gears are rotatably and non-translatable coupled to the base plate; and the first and second gears operably coupled with the first and second threaded shafts, said first and second gear having interior surfaces including threads matably engaged with said first and second threaded shafts, whereby rotation of said first and second gears initiates displacement of said first and second threaded shafts, whereby said first and second threaded shafts are extendable in a direction away from said base plate; wherein the first and second shafts are coupled to a top plate, wherein the first and second gears are positioned substantially perpendicular to the base plate and adjacent to one another, wherein the first and second gears engage with each other, expanding the expandable implant; and closing the site in the patient'"'"'s body. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for facilitating fusion of two adjacent joint surfaces in a patient comprising the steps of:
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providing an expandable implant for insertion in a space between adjacent bony structures, comprising; a first and a second threaded shaft; a first gear and a second gear; a base plate, the first and second gears are rotatably and non-translatably coupled to the base plate; and the first and second gears operably coupled with the first and second threaded shafts, said first and second gears having interior surfaces including threads matably engaged with said first and second threaded shafts, whereby rotation of said first and second gears initiates displacement of said first and second threaded shafts, whereby said first and second threaded shafts are extendable in a direction away from said base plate; wherein the first and second gears are positioned substantially perpendicular to the base plate and adjacent to one another, wherein the first and second gears are engaged to each other, expanding the expandable implant. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for facilitating fusion of two adjacent joint surfaces in a patient comprising the steps of:
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providing an expandable implant for insertion in a space between adjacent bony structures, comprising; a first and a second threaded shaft, each having an upper surface and a lower surface, the upper surfaces coupled a top plate; a first gear and a second gear; a base plate, the first and second gears are rotatably and non-translatably coupled to the base plate; and the first and second gear operably coupled with the first and second threaded shafts, said first and second gears having interior surfaces including threads matably engaged with said first and second threaded shafts, whereby rotation of said first and second gears initiates displacement of said first and second threaded shafts, whereby said first and second threaded shafts are extendable in a direction away from said base plate; wherein the first and second gears engage with each other, wherein the top plate includes a first hole and a second hole extending into the first and second threaded shafts, wherein the first and second holes are configured to receive bone graft material, expanding the expandable implant.
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Specification