摘要:
This invention comprises an apparatus and a method of spreading an intervertebral space to help guide tools that will prepare the vertebrae for accepting an implant. The spreader is a thin blade with cam surfaces forming a paddle on the proximal end, which spreads the vertebra when rotated 90 degrees about its axis. A stem between the paddle and a handle is notched to clear the vertebral protrusions so the vertebra will be distracted on the vertebral end plates. Since the spreader is in the center of the end plates, the centerline of the spreader shaft will coincide with the vertebral end plate centerline. The surgeon can monitor the spreading, stop and remove the spreader to make adjustments or to change the size of spreader as required at the time of the surgery. Once the vertebrae are distracted a tube may be placed over the handle and aligned with the vertebral end plates.
摘要:
A device and a method for stabilizing cervical vertebrae in a human spine for the purpose of fixing one vertebra with respect to other vertebrae and with respect to other parts of the spinal column. This device comprises a plate and bone screws fabricated from non-metals. The bone screws maintain the plate in contact with the vertebrae. An interference fit screw head is pulled into a hole in the plate and into a machined hole in the vertebral bone, locking the screw to the plate and locking the screw to the bone. This locking reduces the screw bending within the plate and within the bone. The screw thread runout is threaded below the screw/bone interference fit area, protecting the runout stress raisers from bending and shear stresses. The interference fit is configured to create sufficient friction to eliminate the screw from backing out.
摘要:
A device and a method for stabilizing lumbar and thoracic vertebra or individual bones in human spine or bone column is provided for the purpose of fixing a vertebra or individual bone with respect to other vertebra or individual bones and with respect to other parts of the spinal or bone column. While providing spinal stabilization, the stabilizer allows axial load sharing or construct dynamized action. The device allows the vertebra or individual bones to be held in compression allowing subsidence along the plate axis or to be fixed with respect to the plate for rigid stabilization. The vertebra or individual bones will be prevented from distraction by a stop lock clamp. The device may be configured as a fully or partially rigid system.
摘要:
This invention describes a hand operated, end cutting, sheet metal shear that makes cuts perpendicular to the axis of the tool handle. The shearing surfaces consist of a moving shear blade with a fixed rake angle and shear angle, cutting along a blunt anvil. The shear blade is pivotally mounted to the tool body and actuated by a toggle linkage and a movable handle. A stroke adjustment screw is incorporated into the fixed handle. The blade passes along the fixed anvil in response to squeezing the handles. The blade is angled so that the shearing action takes place sequentially along the anvil edge. The end cutting sheet metal tool is used to produce cuts at an angle to cuts made with sheet metal cutting tools.