SPINAL FIXATION ASSEMBLY
First Claim
Patent Images
1. A locking mechanism comprising:
- a body having a bottom portion and a side portion, the side portion being configured to receive a rod;
a fixation device extending at least partially through a hole in the bottom portion of the body, the fixation device comprising an at least partially spherical head;
an at least partially spherical insert at least partially surrounding the head of the fixation device; and
a rod seat having an opening for engaging a top portion of the insert such that upon engagement, the rod seat applies forces to the insert that have both lateral and vertical components.
2 Assignments
0 Petitions
Accused Products
Abstract
A locking mechanism (100) and method of fixation, such as the fixation of a fixation device (104) like a bone screw and of a rod (106) to the spine. The locking mechanism (100) includes a body (102), an insert (108, 308), a rod seat (110, 310) and a set screw. The body (102) includes a bottom portion (114) configured to receive the fixation device (104) and the insert (108, 308) but prevents the insert (108, 308) and fixation device (104) from passing therethrough once the insert (108, 308) and fixation device (104) are engaged. The body (102) further includes a side portion (120) configured to receive the rod (106). Between the rod (106) and the insert (108, 308) is a rod seat (110, 310).
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Citations
53 Claims
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1. A locking mechanism comprising:
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a body having a bottom portion and a side portion, the side portion being configured to receive a rod; a fixation device extending at least partially through a hole in the bottom portion of the body, the fixation device comprising an at least partially spherical head; an at least partially spherical insert at least partially surrounding the head of the fixation device; and a rod seat having an opening for engaging a top portion of the insert such that upon engagement, the rod seat applies forces to the insert that have both lateral and vertical components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A locking mechanism comprising:
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a body having a bottom portion and a side portion, the side portion being configured to receive a rod; a fixation device extending at least partially through a hole in the bottom portion of the body, the fixation device comprising an at least partially spherical head; and an at least partially spherical insert at least partially surrounding the head of the fixation device such that when the insert and fixation device are forced toward the bottom of the body, the insert applies generally perpendicular force to at least one location on a surface of an upper hemisphere of the head of the fixation device (104) and further applies generally perpendicular force to at least one location on a surface of a lower hemisphere of the head of the fixation device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A locking mechanism comprising:
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a body having a bottom portion and a side portion, the side portion being configured to receive a rod selected from a group of rods of varying diameter; a fixation device extending at least partially through a hole in the bottom portion of the body; and a rod seat between the selected rod and the fixation device, the rod seat comprising a taper for engaging the selected rod and aligning the center of the selected rod with the central axis of the body, the taper having two sides and at least two curvatures on each side, each curvature having a surface for engaging the selected rod such that the diameter of the selected rod determines which of the surfaces of the at least two curvatures engages the selected rod. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A locking mechanism comprising:
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a body having a bottom portion and a side portion, the side portion being configured to receive a rod; a fixation device extending at least partially through a hole in the bottom portion of the body, the fixation device comprising a spherical head; an at least partially spherical insert at least partially surrounding the head of the fixation device, the insert having downward fingers extending from a portion of the insert corresponding to an upper hemisphere of the head of the fixation device to a portion of the insert corresponding to a lower hemisphere of the head of the fixation device and upward fingers extending from the portion of the insert corresponding to the lower hemisphere of the head of the fixation device to the portion of the insert corresponding to the upper hemisphere of the head of the fixation device; and a rod seat having a tapered portion for receiving the rod and an opening for engaging a top portion of the insert such that upon engagement, the rod seat applies forces to the insert that have both lateral and vertical components. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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52. A method for locking the relative positions of a fixation device and a rod comprising:
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placing an insert through a hole in a bottom portion of a body of a locking mechanism; placing a fixation device having a generally spherical head through the hole in the bottom portion of the body of the locking mechanism; engaging the head of the fixation device with the insert; engaging a top portion of the insert with a rod seat; placing the rod in a side portion of the body such that the rod and insert are on opposite sides of the rod seat; and urging the rod toward the rod seat such that the rod seat applies forces to the insert that have both lateral and vertical components.
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53. A method for locking the relative positions of a fixation device and a rod comprising:
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placing an insert through a hole in a bottom portion of a body of a locking mechanism; placing a fixation device having a generally spherical head through the hole in the bottom portion of the body of the locking mechanism; engaging the head of the fixation device with the insert such that the insert at least partially surrounds the head of the fixation device; placing the rod in a side portion of the body such that the rod and the insert bottom portion of the body are on opposite sides of the insert; and causing the insert to apply generally perpendicular force to at least one location on a surface of an upper hemisphere of the head of the fixation device and further to apply generally perpendicular force to at least one location on a surface of a lower hemisphere of the head of the fixation device.
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Specification