Retrograde resection apparatus and method

• US 20080183174A1
• Filed: 12/11/2007
• Published: 07/31/2008
• Est. Priority Date: 12/11/2006
• Status: Active Grant

• Current Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Original Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Inventors: Sikora, George, Brightman, Tim, Ek, Steven W.
• Granted Patent: US 9,358,029 B2
• Time in Patent Office: Days
• US Class Current: 606/83
• CPC Class Codes: A61B 17/1617 with mobile or detachable parts
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/320016 Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes A61B10/0233, A61B17/29, A61B17/3207 take precedence
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments

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.

Claims

1. A retrograde resection apparatus, comprising:

a cutting blade having a body defining a first surface and a second surface, including at least one cutting feature provided on said second surface;

a slot defined through at least a portion of said body;

a recess defined in at least a portion of said slot;

a shaft having a distal end and a proximal end, wherein a portion of said distal end is received in said recess; and

a biasing device slidably disposed on said shaft and configured to bias said shaft against said cutting blade.

2. The apparatus of claim 1, further comprising:

a hemispherical protrusion extending from said distal end of said shaft, wherein said protrusion is configured to be at least partially received in said recess.

3. The apparatus of claim 1, wherein at least a portion of said distal end of said shaft is configured to be received in said slot.

4. 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.

5. The apparatus of claim 4, wherein said shaft is rotatable in said bore.

7. The apparatus of claim 4, wherein said screw includes a plurality of continuous threads in a central portion and a tap proximate said distal end.

8. The apparatus of claim 1, further comprising:

a first sleeve slidably positioned on said shaft;

a spring slidably positioned on said shaft between said first sleeve and said biasing member.

9. The apparatus of claim 1, 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.

10. The apparatus of claim 9, 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.

11. The apparatus of claim 9, 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.

12. The apparatus of claim 1, 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.

13. The apparatus of claim 12, 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.

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

15. The apparatus of claim 1, wherein said cutting blade is non-rotatable with respect to said shaft when said distal end is received in said recess.

16. The apparatus of claim 1, wherein said cutting blade is tiltable at an angle defined by the axis of said shaft and a surface of said cutting blade.

17. The apparatus of claim 1, wherein said cutting blade body is less than 1 mm in thickness.

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

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

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

20. A retrograde resection apparatus, comprising:

a cutting blade having a body defining a first surface and a second surface, including a cutting feature extending from said second surface;

a slot defined in said cutting blade;

a recess defined in at least a portion of said 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 said shaft passes through said bore and said distal end is configured to be received in said recess;

a biasing member slidably disposed on said shaft and configured to bias said shaft against said cutting blade; and

a tether, a first portion of which is affixed to said cutting blade and a second portion of which passes through said bore.