Multi-axis internal spinal fixation
AssigneePerumala Corporation
InventorMadhavan Pisharodi
Life of this patent
Estimating the term…
Abstract
According to an embodiment, a spinal implant having vertical and horizontal plates with through-holes for receiving a pre-configured square bolt is disclosed. The embodiments of the invention include very long square bolts that can accommodate the height of at least of two vertically stacked plates. When used to reduce spondylolisthesis, a portion of the square bolt can be broken after the desired alignment of the listhetic vertebrae is observed. The square bolts also allow extension of vertical plates above or below an existing fusion by placement of an extension vertical plate on to the previous one without removing it. This makes extension of instrumentation extremely easy.
Claims19
A spondylolisthesis reduction kit containing:
- a plurality of horizontal plates;
- a plurality of vertical plates, and
- a first set of bolts, wherein the first set of bolts is configured to couple one or more stacked pairs of vertical plates to a first horizontal plate, wherein each of the bolts in the first set of bolts includes:
- a square-shaped head,
- a non-threaded portion proximal to the square-shaped head,
- a first threaded portion proximal to the non-threaded portion,
- a second threaded portion, and
- a waist portion, wherein the waist portion is configured to separate the first and second threaded portions.
A spinal implant kit, containing:
- a plurality of horizontal plates;
- a plurality of vertical plates;
- and
- a set of bolts, wherein each of the bolts includes:
- a square-shaped head,
- a non-threaded portion proximal the square-shaped head, and
- a threaded portion proximal the non-threaded portion,
- wherein each horizontal and vertical plate includes a through-hole for receiving one or more bolts.
A method for extending an original spinal fusion, wherein the original spinal fusion comprises two or more horizontal plates and a first set of vertical plates coupled to the two or more horizontal plates, the extension comprising:
- affixing a second set of vertical plates to the first set of vertical plates and a last horizontal plate in the original spinal fusion;
- and
- coupling the second set of vertical plates to one or more additional horizontal plates.
A method of facilitating spondylolisthesis reduction comprising:
- providing a spinal implant kit containing a plurality of horizontal and vertical plates and two sets of bolts, wherein each of the plates includes a through-hole for receiving a bolt;
- stacking a first vertical plate over a second vertical plate and a third vertical plate over a fourth vertical plate;
- securing, with a first set of bolts, the stacked vertical plates to at least a first horizontal plate, wherein the first horizontal plate is along a perpendicular axis to the stacked vertical plates;
- using a second set of bolts, securing the stacked vertical plates to a second horizontal plate, wherein the second horizontal plate is positioned along a lower plane than the first horizontal plate, wherein the lower plane corresponds to a listhetic vertebrae, and
- wherein the second set of bolts is substantially longer than the first set of bolts.
Dependencies are inferred from the claim text.