Retrograde resection apparatus and method
First Claim
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1. A retrograde resection apparatus, comprising:
- a shaft having a distal end, a proximal end, and a longitudinal axis extending therebetween, said distal end including at least one protrusion extending radially outward from said shaft; and
a cutting blade having a disc shape and comprising a first surface, a second surface opposite to said first surface, and a central region including center of rotation, said cutting blade further comprising;
a retrograde cutting feature projecting outwardly from said second surface, said retrograde cutting feature configured to remove bone when said cutting blade is rotated about said center of rotation of said cutting blade;
an elongated radial slot having a depth extending through said first surface to said second surface, a radial length extending along said first surface and said second surface and through at least a portion of said central region towards a peripheral edge of said cutting blade, and a width extending between radial edges of said elongated slot, wherein said radial length is greater than said width; and
at least one axial recess extending partially inward from said first surface towards said second surface of said cutting blade, the at least one axial recess open into a portion of said elongated radial slot in said central region;
wherein said radial length of said elongated radial slot is greater than a cross-sectional width of said shaft and said at least one protrusion to allow said distal end of said shaft and said at least one protrusion to be advanced from said second surface of said cutting blade, through said elongated radial slot, to said first surface and into said central region of said cutting blade such that said at least one protrusion engages said at least one axial recess and said second surface and said retrograde cutting feature faces toward said proximal end of said shaft, wherein rotation and retrograde movement of said shaft causes said cutting blade to rotate about said center of rotation along said longitudinal axis of said shaft and remove bone when said at least one protrusion engages said at least one axial recess and wherein said cutting blade is tiltable with respect to said longitudinal axis of said shaft when said at least one protrusion engages said at least one axial recess as said shaft and said cutting blade rotate about said center of rotation along said longitudinal axis of said shaft.
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Abstract
A retrograde resection apparatus may include a cutting blade including a slot defined in the cutting blade, a recess defined in at least a portion of the slot, a screw, including a proximal end and a distal end defining a bore therethrough, a shaft having a distal end and a proximal end, wherein the shaft passes through the bore and the distal end is configured to be received in the recess, and a biasing device configured to bias the shaft against the cutting blade. In addition, the apparatus may include a tether, a first portion of which is affixed to the cutting blade and a second portion of which passes through the bore.
936 Citations
20 Claims
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1. A retrograde resection apparatus, comprising:
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a shaft having a distal end, a proximal end, and a longitudinal axis extending therebetween, said distal end including at least one protrusion extending radially outward from said shaft; and a cutting blade having a disc shape and comprising a first surface, a second surface opposite to said first surface, and a central region including center of rotation, said cutting blade further comprising; a retrograde cutting feature projecting outwardly from said second surface, said retrograde cutting feature configured to remove bone when said cutting blade is rotated about said center of rotation of said cutting blade; an elongated radial slot having a depth extending through said first surface to said second surface, a radial length extending along said first surface and said second surface and through at least a portion of said central region towards a peripheral edge of said cutting blade, and a width extending between radial edges of said elongated slot, wherein said radial length is greater than said width; and at least one axial recess extending partially inward from said first surface towards said second surface of said cutting blade, the at least one axial recess open into a portion of said elongated radial slot in said central region; wherein said radial length of said elongated radial slot is greater than a cross-sectional width of said shaft and said at least one protrusion to allow said distal end of said shaft and said at least one protrusion to be advanced from said second surface of said cutting blade, through said elongated radial slot, to said first surface and into said central region of said cutting blade such that said at least one protrusion engages said at least one axial recess and said second surface and said retrograde cutting feature faces toward said proximal end of said shaft, wherein rotation and retrograde movement of said shaft causes said cutting blade to rotate about said center of rotation along said longitudinal axis of said shaft and remove bone when said at least one protrusion engages said at least one axial recess and wherein said cutting blade is tiltable with respect to said longitudinal axis of said shaft when said at least one protrusion engages said at least one axial recess as said shaft and said cutting blade rotate about said center of rotation along said longitudinal axis of said shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18)
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15. A retrograde resection apparatus, comprising:
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a shaft having a distal end, a proximal end, and a longitudinal axis extending therebetween, wherein said distal end comprises a first protrusion and a second protrusion extending radially outward from said shaft; and a cutting blade comprising; a body having a disc shape and defining a first surface and a second surface opposite to said first surface, and a central region defining a center of rotation, said body further including a retrograde cutting feature projecting from said second surface; an elongated radial slot extending through said first surface to said second surface of said body, said elongated radial slot having a first radial edge and a second radial edge, a depth extending between said first and said second surfaces of said body, and a radial length greater than a width, wherein said radial length extends along said first surface and said second surface and through a portion of said central region towards a peripheral edge of said body of said cutting blade and wherein said width extends between said first and second radial edges of said elongated radial slot; and a first axial recess and a second axial recess defined in a first portion and a second portion said elongated radial slot in said central portion, respectively, and each of the axial recesses extending partially inward from said first surface towards said second surface in said central region of said body; wherein said radial length of said elongated radial slot is greater than a cross-sectional width of said shaft and said first and second protrusions to allow said distal end of said shaft and said first and second protrusions to be advanced from said second surface of said body, through said elongated radial slot to said first surface and into said central region of said body, such that said first and second protrusions engage said first and said second recesses, respectively, and said cutting blade is tiltable with respect to said longitudinal axis of said shaft and said second surface and said retrograde cutting feature faces toward said proximal end of said shaft when said first and second protrusions engage said first and said second axial recesses as said shaft and said cutting blade rotate about said center of rotation along said longitudinal axis of said shaft and move in a retrograde movement to remove bone. - View Dependent Claims (19)
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20. A retrograde resection apparatus, comprising:
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a shaft having a distal end, a proximal end, and a longitudinal axis extending therebetween, said distal end including at least one protrusion extending radially outward from said shaft; and a cutting blade comprising; a body having a disc shape defining a first surface and a second surface opposite to said first surface; a retrograde cutting feature projecting outwardly from said first or said second surface, said cutting feature configured to remove bone when said cutting blade is rotated about a center of rotation of said body of said cutting blade; an elongated radial slot extending into an axial opening in a central region of said body and passing through at least a portion of said central region of said body and through said first surface to said second surface of said body, said elongated radial slot having a depth extending between said first and said second surfaces, and a radial length greater than a width, wherein said radial length extends along said first surface and said second surface and towards a peripheral edge of said cutting blade from said axial opening and wherein said width extends between radial edges of said elongated radial slot; and at least one axial recess extending partially inward from said first surface towards said second surface of said body, the at least one axial recess located within the axial opening in said central region; wherein said radial length of said elongated radial slot is greater than a cross-sectional width of said shaft and said at least one protrusion to allow said distal end of said shaft and said at least one protrusion to be advanced from said second surface of said body, through said elongated radial slot, to said first surface of said body and into said axial opening in said central region, such that said at least one protrusion engages said at least one recess and said second surface and said retrograde cutting feature faces toward said proximal end of said shaft and said cutting blade is tiltable with respect to said longitudinal axis of said shaft when said at least one protrusion engages said at least one axial recess as said shaft and said cutting blade rotate about said center of rotation along said longitudinal axis of said shaft to remove bone in a retrograde movement of said shaft and said cutting blade.
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Specification