System for radial bone displacement

A system for use in spinal surgery, said system comprising:na cannula having a proximal end, a distal end opposite said proximal end, a mid-longitudinal axis passing through said proximal and distal ends, a length from said proximal end to said distal end, a sidewall connecting said proximal and distal ends, and a hollow interior, said sidewall completely surrounding the mid-longitudinal axis of said cannula along a majority of the length of said cannula; anda surgical instrument comprising:nan elongated handle having opposed ends with a length therebetween, a height, and a rounded gripping portion along the length of said handle, the length of said handle being the maximum dimension of said handle, said handle having a midpoint halfway between said opposed ends;a shaft having a proximal end, a distal end, and a longitudinal central axis between said proximal and distal ends, said proximal end of said shaft being connected to said handle, the longitudinal central axis of said shaft extending through the height of said handle and being offset from the midpoint of said handle; andan arm extending radially from said shaft proximate said distal end of said shaft, said arm terminating in a surface adapted to directly contact and displace cancellous bone in response to moving said shaft, said arm having a longitudinal axis extending through said shaft and through said surface, said surface being adapted to make a path through the cancellous bone in a plane perpendicular to the longitudinal central axis of said shaft, said shaft having a length sufficient to permit said arm to extend beyond said distal end of said cannula when said shaft is inserted into said cannula.

A system for use in spinal surgery, said system comprising:na tubular member having a proximal end, a distal end opposite said proximal end, a mid-longitudinal axis passing through said proximal and distal ends, a length from said proximal end to said distal end, a sidewall connecting said proximal and distal ends, and a hollow interior, said sidewall completely surrounding the mid-longitudinal axis of said tubular member along a majority of the length of said tubular member; anda surgical instrument comprising:nan elongated handle having opposed ends and a rounded gripping portion therebetween;a shaft having a proximal end, a distal end, and a longitudinal central axis between said proximal and distal ends;an arm extending radially from said shaft proximate said distal end of said shaft, said arm terminating in a surface adapted to directly contact and displace cancellous bone in response to moving said shaft, said arm having a longitudinal axis extending through said shaft and through said surface, said surface being adapted to make a path through the cancellous bone in a plane perpendicular to the longitudinal central axis of said shaft, said shaft having a length sufficient to permit said arm to extend beyond said distal end of said tubular member when said shaft is inserted into said tubular member; andna cylindrical portion between the proximal end of said shaft and at least a portion of said handle, said cylindrical portion being connected to said proximal end of said shaft, said cylindrical portion having a maximum height parallel to the longitudinal central axis of said shaft and a diameter transverse to the longitudinal central axis of said shaft, the diameter of said cylindrical portion being greater than the maximum height of said cylindrical portion, the longitudinal central axis of said shaft passing through said cylindrical portion and a portion of said handle.

A system for use in spinal surgery, said system comprising:na cannula having a proximal end, a distal end configured for engagement with at least one vertebral body of a human spine, a length therebetween, a mid-longitudinal axis passing through said proximal and distal ends, and a sidewall defining at least in part a passage connecting said proximal and distal ends, said sidewall completely surrounding the mid-longitudinal axis of said cannula along a majority of the length of said cannula; andna surgical instrument comprising:na shaft having a proximal end, a distal end, a longitudinal central axis, and a length between said proximal and distal ends, said instrument being adapted to be deployed into position to displace cancellous bone by movement of said shaft within and along said passage of said cannula;an arm extending radially from said shaft proximate said distal end of said shaft, said arm terminating in a surface adapted to directly contact and displace cancellous bone in response to moving said shaft within said passage of said cannula, said surface having a maximum height from said shaft in a plane perpendicular to the longitudinal central axis of said shaft, said arm having a longitudinal axis extending through said shaft and through said maximum height of said surface, said surface being adapted to make a path through the cancellous bone in a plane perpendicular to the longitudinal central axis of said shaft, the length of said shaft being sufficient to permit said arm to extend beyond said distal end of said cannula; anda depth stop on said shaft adapted to limit over penetration of said shaft through said cannula.

A system for use in spinal surgery, said system comprising:na tubular member having a proximal end, a distal end opposite said proximal end, a mid-longitudinal axis passing through said proximal and distal ends, a length from said proximal end to said distal end, a sidewall connecting said proximal and distal ends, and a hollow interior, said sidewall completely surrounding the mid-longitudinal axis of said tubular member along a majority of the length of said tubular member; anda surgical instrument comprising:nan elongated handle having first and second opposed ends, a length therebetween, the length being the maximum dimension of said handle, and a rounded gripping portion along the length; andan elongated member having a proximal end, a distal end, and a central longitudinal axis, said elongated member having a plane passing therethrough and extending along the central longitudinal axis, said proximal end of said elongated member being connected to said handle, the central longitudinal axis of said elongated member extending through said distal end and said handle between said first and second opposed ends, said elongated member having a bone-contacting surface having a perimeter with a first linear edge portion and a second linear edge portion opposite said first linear edge portion, at least one of said linear edge portions being adapted to contact and displace bone in response to rotating said elongated member about its central longitudinal axis, said first and second linear edge portions of said bone contacting surface being on the same side of the plane extending along the central longitudinal axis of said elongated member;each of said first and second opposed ends of said handle having a point most-distant from the central longitudinal axis of said elongated member, the length of said handle being in a longitudinal plane with the central longitudinal axis of said elongated member, said most-distant points of said first and second opposed ends of said handle being in respective first and second planes that are parallel to one another and perpendicular to the longitudinal plane, said bone-contacting surface of said elongated member being between the first and second planes of said first and second opposed ends of said handle.

An apparatus for use in spinal surgery for displacing bone, said apparatus comprising:na tubular member having a proximal end, a distal end opposite said proximal end, a mid-longitudinal axis passing through said proximal and distal ends, a length from said proximal end to said distal end, a sidewall connecting said proximal and distal ends, and a hollow interior, said sidewall completely surrounding the mid-longitudinal axis of said tubular member along a majority of the length of said tubular member; anda bone displacement device including a handle having opposed ends and a rounded gripping portion therebetween, an elongated member connected to said handle, said elongated member having a central longitudinal axis, and a bone displacement portion having a first bone-contacting edge and a second bone-contacting edge opposite said first bone-contacting edge, said first and second bone-contacting edges being at an angle relative to one another and at an angle to the central longitudinal axis of said elongated member, said bone displacement device having a length along said elongated portion that is greater than the length of said tubular member sufficient to permit said arm to extend beyond said distal end of said tubular member, said bone displacement portion having a height from the central longitudinal axis of said elongated member that permits at least a portion of said bone displacement portion to extend radially beyond the perimeter of said sidewall of said tubular member in a plane transverse to the mid-longitudinal axis of said tubular member.

A system for use in spinal surgery, said system comprising:na cannula having a proximal end, a distal end opposite said proximal end, a mid-longitudinal axis passing through said proximal and distal ends, a length from said proximal end to said distal end, a sidewall connecting said proximal and distal ends, and a hollow interior, said sidewall completely surrounding the mid-longitudinal axis of said cannula along a majority of the length of said cannula; anda surgical instrument comprising:nan elongated handle having opposed ends with a length therebetween, and a rounded gripping portion, the length of said handle being the maximum dimension of said handle, said handle having a midpoint half way between said opposed ends;a shaft having a proximal end, a distal end, and a longitudinal central axis between said proximal and distal ends, said proximal end of said shaft being connected to said handle, the longitudinal central axis of said shaft extending through said gripping portion of said handle, the longitudinal central axis of said shaft being offset from the midpoint of said handle and at an angle to the length of the handle, the length of said shaft being sufficient to permit said arm to extend beyond said distal end of said cannula; andan arm extending radially from said shaft proximate said distal end of said shaft, said arm terminating in a surface adapted to directly contact and displace cancellous bone in response to moving said shaft, said arm having a longitudinal axis extending through said shaft and through said surface, said surface being adapted to make a path through the cancellous bone in a plane perpendicular to the longitudinal central axis of said shaft.