Vertebral endplate chisel
First Claim
Patent Images
1. A vertebral endplate chisel comprising:
- a) a base having upper and lower portions, and proximal and distal portions, b) an upper shaving portion extending distally from the upper base portion, c) a lower shaving portion extending distally from the lower base portion, the upper and lower shaving portions being disposed substantially parallel to each other and each having a width, and d) a guide integrally connected to and extending distally from the base and having a width, the guide located between the shaving portions and having a width wherein the width of the guide is no more than 95% of the width of the upper shaving portion,wherein the guide is a non-cutting centering device adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space.
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Accused Products
Abstract
A vertebral endplate chisel having upper and lower shaving portions, and a non-cutting guide integrally connected to and extending between the shaving portions and adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space.
180 Citations
42 Claims
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1. A vertebral endplate chisel comprising:
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a) a base having upper and lower portions, and proximal and distal portions, b) an upper shaving portion extending distally from the upper base portion, c) a lower shaving portion extending distally from the lower base portion, the upper and lower shaving portions being disposed substantially parallel to each other and each having a width, and d) a guide integrally connected to and extending distally from the base and having a width, the guide located between the shaving portions and having a width wherein the width of the guide is no more than 95% of the width of the upper shaving portion, wherein the guide is a non-cutting centering device adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
wherein each of the intermediate, upper and lower portions has a width, and wherein the width of each of the upper and lower portions is greater than the width of the intermediate extending portion. -
14. The chisel of claim 13 wherein the I-beam-like shape is an I-beam shape.
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15. The chisel of claim 13 wherein the I-beam-like shape is a bulging I-beam shape.
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16. The chisel of claim 13 wherein the I-beam-like shape is a bow-tie shape.
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17. The chisel of claim 13 wherein the guide includes a neck portion extending distally from the intermediate portion and a head portion extending distally from the neck.
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18. The chisel of claim 17 wherein the neck is rectangularly shaped.
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19. The chisel of claim 17 wherein the neck widens at an angle β
- as it extends distally.
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20. The chisel of claim 19 wherein the upper shaving portion comprises an outer surface and an inner surface whose intersection forms a tip having an angle α
- suitable for shaving endplates, and wherein the angle β
is substantially equal to the angle α
.
- suitable for shaving endplates, and wherein the angle β
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21. The chisel of claim 17 wherein the head has a tapered distal portion which narrows distally.
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22. The chisel of claim 21 wherein the taper distal portion of the head portion forms an angle γ
- of between 30 and 60 degrees.
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23. The chisel of claim 17 wherein the head portion has an axial cross section having a bullet shape.
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24. The chisel of claim 17 wherein the head portion has a nipple-like distal portion.
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25. The chisel of claim 17 wherein the head portion has a radial cross-section having a circular shape.
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26. The chisel of claim 17 wherein the head portion has an axial cross section having a rectangular shape having a height and a width.
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27. The chisel of claim 26 wherein the head portion has a height and a width, and is dimensioned so that the height is at least 5 times the width.
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28. The chisel of claim 1 wherein the upper shaving portion comprises an outer surface and an inner surface whose intersection forms a tip having an angle α
- suitable for shaving endplates.
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29. The chisel of claim 28 wherein the angle α
- is between 20 and 40 degrees.
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30. The chisel of claim 28 wherein the lower shaving portion comprises an outer surface and an inner surface whose intersection forms a tip having the same angle α
- as that of the upper shaving portion.
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31. The chisel of claim 1 wherein the guide comprises a neck portion extending distally from the base and a head portion extending from the neck, wherein the head comprises upper and lower lands.
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32. The chisel of claim 31 wherein at least a portion of each land extends further distally than the shaving portions.
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33. The chisel of claim 1 wherein the guide is substantially centered between the shaving portions.
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34. The chisel of claim 1 wherein the guide and the upper shaving portion each have a width, and the width of the guide is no more than 50% of the shaving portion width.
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35. The chisel of claim 1 wherein the guide width is no more than 25% of the shaving portion width.
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36. The chisel of claim 1 wherein the guide comprises a neck portion extending from the base and a head portion extending from the neck, and the head is sufficiently thin and centered so that the entire guide width is located within the middle one-third of the width of the shaving portions.
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37. The chisel of claim 36 wherein the guide is located within the middle one-fifth of the width of the shaving portions.
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38. A vertebral endplate chisel comprising:
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a) a base having upper, lower and intermediate portions, and proximal and distal portions, b) no more than two shaving portions for contouring vertebral endplates, comprising;
i) an upper shaving portion extending distally from the upper portion, and ii) a lower shaving portion extending distally from the lower portion, the upper and lower shaving portions being disposed substantially parallel to each other to define a separation distance, and c) a guide extending from the intermediate portion of the base and forming a head portion, wherein the head portion of the guide extends further distally than the shaving portions, wherein the guide is a non-cutting centering device adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space. - View Dependent Claims (39, 40)
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41. A vertebral endplate chisel comprising:
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a) a base having upper and lower portions, and proximal and distal portions, b) an upper shaving portion extending distally from the upper portion, c) a lower shaving portion extending distally from the lower portion, the upper and lower shaving portions being disposed substantially parallel to each other, and d) a single guide disposed between the shaving portions and extending distal to the shaving portions, and having a height and a width, wherein the height of the single guide at least 5 times greater than its width, wherein the guide is a non-cutting centering device adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space.
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42. A vertebral endplate chisel comprising:
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a) a base having upper and lower portions extending distally therefrom, b) an upper shaving portion extending distally from the upper portion, c) a lower shaving portion extending distally from the lower portion, the upper and lower shaving portions being disposed substantially parallel to each other, and d) a single guide disposed between the shaving portions and extending distal to the shaving portions, and having a height and a width, wherein the width of the single guide no more than 50% of the width of the upper and lower shaving portion. wherein the guide is a non-cutting centering device adapted to center the chisel within the disc space so that equal amounts of bone are removed from each endplate by the shaving portions as the chisel moves through the disc space.
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Specification