MINIMALLY INVASIVE SCREW EXTENSION ASSEMBLY
First Claim
1. A screw extension assembly for use in minimally invasive spinal surgery, the assembly comprising:
- an inner slotted shaft, the inner slotted shaft being an elongated hollow tubular shaft having a proximal end, a distal end and a slotted distal end portion having a pair of slots open through the distal end defining a pair of deflectable leg extensions, each leg extension having a projection configured to engage a groove on an outer surface of a slotted rod receiving implant thereby coupling the inner shaft to the slotted rod receiving implant adjacent slots at the distal end of the leg extensions having a plurality longitudinal edges keyed to abut proximal walls of the slotted rod receiving implant to prevent rotation;
an outer shaft configured to receive and pass over the inner shaft;
the outer shaft having a pair of slots open through a distal end with longitudinal rails adjacent edges of each slot of the outer shaft to slide along each edge of the slots of the leg extensions of the inner shaft along at least a portion of the slots; and
wherein the outer shaft, when moved inwardly toward the distal end of the inner shaft into an engaged position, locks the deflectable legs in a coupled position to the grooves of the slotted rod receiving implant.
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0 Petitions
Accused Products
Abstract
A screw extension assembly for use in minimally invasive spinal surgery, the assembly has an inner slotted shaft and an outer shaft, a rod reducer and a removable nut. The combination when assembled is configured to move a spinal fixation rod into a slotted rod receiving spinal implant where it is seated and affixed thereto. The screw extension assembly further has a locking knob rotationally coupled to a proximal end of the outer shaft, wherein the inner shaft has one or more cam grooves and the locking knob has a pin extending into and guided by said cam groove causing the outer shaft to translate longitudinally upon rotation of the locking knob relative to the inner shaft toward an engaged position locking the deflectable legs in the coupled position to the slotted rod receiving implant.
15 Citations
30 Claims
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1. A screw extension assembly for use in minimally invasive spinal surgery, the assembly comprising:
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an inner slotted shaft, the inner slotted shaft being an elongated hollow tubular shaft having a proximal end, a distal end and a slotted distal end portion having a pair of slots open through the distal end defining a pair of deflectable leg extensions, each leg extension having a projection configured to engage a groove on an outer surface of a slotted rod receiving implant thereby coupling the inner shaft to the slotted rod receiving implant adjacent slots at the distal end of the leg extensions having a plurality longitudinal edges keyed to abut proximal walls of the slotted rod receiving implant to prevent rotation; an outer shaft configured to receive and pass over the inner shaft;
the outer shaft having a pair of slots open through a distal end with longitudinal rails adjacent edges of each slot of the outer shaft to slide along each edge of the slots of the leg extensions of the inner shaft along at least a portion of the slots; andwherein the outer shaft, when moved inwardly toward the distal end of the inner shaft into an engaged position, locks the deflectable legs in a coupled position to the grooves of the slotted rod receiving implant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A kit for use in minimally invasive spinal surgery, the kit comprising:
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a slotted rod receiving implant, the rod receiving implant having a proximal slotted rod holding element and a threaded bone fastener extending distal from the rod holding element; an inner slotted shaft, the inner slotted shaft being an elongated hollow tubular shaft having a proximal end, a distal end and a slotted distal end portion having a pair of slots open through the distal end defining a pair of deflectable leg extensions, each leg extension having a projection configured to engage a groove on an outer surface of the slotted rod receiving implant thereby coupling the inner shaft to the slotted rod receiving implant adjacent slots at the distal end of the leg extensions having a plurality longitudinal edges keyed to abut proximal walls of the slotted rod receiving implant to prevent rotation; an outer shaft configured to receive and pass over the inner shaft;
the outer shaft having a pair of slots open through a distal end with longitudinal rails adjacent edges of each slot of the outer shaft to slide along each edge of the slots of the leg extensions of the inner shaft along at least a portion of the slots; andwherein the outer shaft when moved inwardly relative to translate toward the distal end of the inner shaft into an engaged position locks the deflectable legs in a coupled position to the grooves of the slotted rod receiving implant. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification