Retrograde resection apparatus and method

Patent metadata

Field	Value
Publication number	US-9358029-B2
Application number	US-147307-A
Country	US
Kind code	B2
Filing date	Dec 11, 2007
Priority date	Dec 11, 2006
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

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.

First claim

What is claimed is:

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.

2. The apparatus of claim 1 , further comprising a screw, including a proximal end and a distal end defining a bore therethrough, received on said shaft.

3. The apparatus of claim 2 , wherein said shaft is rotatable in said bore of said screw.

4. The apparatus of claim 2 , wherein said screw includes a nut on said proximal end of said screw.

5. The apparatus of claim 2 , wherein said screw includes a plurality of continuous threads in a central portion and a tap proximate said distal end of said screw.

6. The apparatus of claim 1 , further comprising:
a biasing device configured to bias said shaft against said cutting blade;
a first sleeve slidably positioned on said shaft; and
a spring slidably positioned on said shaft between said first sleeve and said biasing device.

7. The apparatus of claim 1 , further comprising a biasing device configured to bias said shaft against said cutting blade, wherein said shaft includes a stem and said biasing member includes a ring including an interior surface having a channel defined therein for receiving said stem.

8. The apparatus of claim 7 , wherein said channel includes a first portion extending along the axis of said shaft and a second portion extending in a direction at an angle from the axis of said shaft.

9. The apparatus of claim 7 , wherein said ring comprises a first sleeve extending from said ring, and said apparatus further comprises a spring supported by said first sleeve and a second sleeve positioned between said spring and said cutting blade and upon biasing said ring, said spring is compressed and a force is transmitted to said cutting blade.

10. The apparatus of claim 1 , further comprising a biasing device configured to bias said shaft against said cutting blade, wherein said shaft includes a recess defined therein and said biasing member includes a collar positioned on a portion of said shaft, wherein said collar includes a ridge for being received in said recess defined in said shaft.

11. The apparatus of claim 10 , wherein said collar includes a base and flexible legs extending from said base and said ridge is positioned on at least one of said legs and wherein said ridge in a first position is received in said recess defined in said shaft and upon flexing said flexible legs said ridge is configured to be removed from said recess.

12. The apparatus of claim 1 , further comprising a tether, wherein said tether is affixed to said cutting blade.

13. The apparatus of claim 1 , wherein the cutting blade defines an edge, said cutting blade has a first thickness and said cutting blade tapers to a second thickness proximate to said edge.

14. The apparatus of claim 1 , wherein said cutting feature includes a lip extending from said second surface of said and a slit defined through said cutting blade at an angle to the second surface of the cutting device.

15. A retrograde resection apparatus, comprising:
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 movemen

Assignees

• Sikora George
• Brightman Tim
• Ek Steven W
• Arthrosurface Inc

Inventors

• Sikora George
• Brightman Tim
• Ek Steven W

Classifications

• A61B17/32002

  with continuously rotating, oscillating or reciprocating cutting instruments · CPC title

• A61B17/1675 Primary

  for the knee · CPC title

• A61B17/1617

  with mobile or detachable parts · CPC title

• A61B17/320016 Primary

  Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes (A61B10/0233, A61B17/29, A61B17/3207 take precedence) · CPC title