Spinal Screw Insertion Devices and Methods
First Claim
1. An instrument for driving a bone anchor assembly into bone, comprising:
- a shaft assembly comprising a first handle and an elongate shaft with a distal tip configured to couple to a bone anchor assembly; and
a stylet adjuster assembly comprising a second handle and a carrier assembly having a plurality of predefined fixed positioning features for allowing a stylet to be releasably coupled to the carrier assembly in at least one predefined fixed position to position a distal tip of the stylet at a desired position relative to the distal tip of the elongate shaft, the carrier assembly being configured to axially translate proximally and distally relative to the shaft assembly in response to rotation of the second handle relative to the elongate shaft, and the carrier assembly being configured to rotate with the shaft assembly in response to rotation of the first handle relative to the second handle.
4 Assignments
0 Petitions
Accused Products
Abstract
Surgical instruments and methods for delivering bone anchor assemblies into bone are disclosed herein. Use of these anchors or instruments can eliminate one or more of the steps in a conventional bone anchor installation procedure, improving surgical efficiency and safety. In general, a surgical instrument can include a handle assembly having an elongate shaft extending distally therefrom. The handle assembly can be configured to axially translate a carrier assembly that secures a stylet extending therethrough. Translation of the stylet can be made relative to a distal end of the elongate shaft. The surgical instruments can include various carrier assemblies for positioning the distal end of the stylet relative to the distal end of the elongate shaft based on a length of bone anchor to be installed by the surgical instrument.
-
Citations
20 Claims
-
1. An instrument for driving a bone anchor assembly into bone, comprising:
-
a shaft assembly comprising a first handle and an elongate shaft with a distal tip configured to couple to a bone anchor assembly; and a stylet adjuster assembly comprising a second handle and a carrier assembly having a plurality of predefined fixed positioning features for allowing a stylet to be releasably coupled to the carrier assembly in at least one predefined fixed position to position a distal tip of the stylet at a desired position relative to the distal tip of the elongate shaft, the carrier assembly being configured to axially translate proximally and distally relative to the shaft assembly in response to rotation of the second handle relative to the elongate shaft, and the carrier assembly being configured to rotate with the shaft assembly in response to rotation of the first handle relative to the second handle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. An instrument for driving a bone fastener into bone, comprising:
-
a handle assembly having first and second handles; an elongate shaft having a distal tip for driving a bone fastener into bone, the elongate shaft being coupled to the first handle such that rotation of the first handle causes corresponding rotation of the elongate shaft to thereby drive a bone fastener into bone; and a carrier assembly coupled between the first and second handles, the carrier assembly having a plurality of mating features for engaging a stylet in a plurality of predefined fixed positions, and wherein rotation of the second handle is effective to advance and retract the stylet to adjust a position of a tip of the stylet relative to a bone fastener coupled to the distal tip of the elongate shaft, and wherein rotation of the first handle for driving a bone fastener coupled to the distal tip of the elongate shaft into bone causes the carrier assembly to move proximally to retract the stylet. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A method for implanting a bone fastener, comprising
coupling a stylet to a carrier assembly of an inserter device at one of a plurality of predefined fixed positions such that a distal tip of the stylet extends a predetermined distance beyond the bone fastener coupled to an elongate shaft of the inserter device, wherein the carrier assembly has a plurality of positioning features that define the plurality of predefined fixed positions; -
positioning the distal tip of the stylet on bone; rotating a first handle of the inserter device relative to a second handle of the inserter device to cause the carrier assembly to translate distally, thereby advancing the distal tip of the stylet into bone; and rotating a second handle of the inserter device to thereby rotate the bone fastener such that the bone fastener is advanced into bone along the stylet, the carrier assembly translating proximally to retract the stylet as the bone fastener is advanced into bone. - View Dependent Claims (18, 19, 20)
-
Specification