Augment reamer and related methods

Patent metadata

Field	Value
Publication number	US-11925362-B2
Application number	US-202117547384-A
Country	US
Kind code	B2
Filing date	Dec 10, 2021
Priority date	Dec 10, 2021
Publication date	Mar 12, 2024
Grant date	Mar 12, 2024

Abstract

Reamer instruments and related methods are disclosed for use in preparing bone, such as a glenoid bone surface, to receive an implant requiring one of two or more possible surface geometries. Described reamer instruments can have a modular or multi-component design. A minimal number of components can be particular to a particular required geometry, which can allow assembly and use of reamer instruments of the present disclosure to be flexible, intuitive, and efficient. In some embodiments, a disposable reamer head assembly can be driven by a disposable drive tip through a pin-on-pin connection. The remaining components of the reamer instrument can be sterilized and re-used. To prepare bone for a half-wedge implant, a half-wedge housing can be coupled to a reamer instrument handle and a depth stop can be coupled to the housing to achieve the required geometry. Alternatively, a full-wedge housing can be coupled to the instrument handle.

First claim

What is claimed is:

1. An instrument for reaming bone, comprising:
an elongate body having a proximal end, a distal end, and an inner throughbore extending therebetween;
a drive shaft having a proximal end configured to couple to a power source and a distal end including a plurality of engagement pins, the drive shaft configured to extend through the inner throughbore of the elongate body such that the plurality of engagement pins on the distal end of the drive shaft extend distal of the distal end of the elongate body; and
a reamer head configured to be removably coupled to the distal end of the elongate body, the reamer head having a body with a distal-facing cutting surface configured to cut bone and at least one engagement aperture extending through at least a portion of the body, the at least one engagement aperture including a plurality of engagement posts associated therewith,
wherein the plurality of engagement pins of the drive shaft are configured to couple with the plurality of engagement posts of the reamer head such that rotation of the drive shaft causes rotation of the reamer head, and
wherein a central longitudinal axis of the drive shaft extends at an oblique angle relative to a central longitudinal axis of the engagement aperture when the plurality of engagement pins of the drive shaft are coupled with the plurality of engagement posts of the reamer head.

2. The instrument of claim 1 , further comprising a locking collar configured to rotate relative to the elongate body to releasably secure the reamer head to the distal end of the elongate body.

3. The instrument of claim 2 ,
wherein the distal end of the elongate body has a plurality of ball bearings and the locking collar has at least one ramp on an inner surface thereof, and
wherein the ball bearings are configured to slide along the ramp when the locking collar rotates relative to the elongate body.

4. The instrument of claim 1 ,
wherein the plurality of engagement pins include a first engagement pin and a second engagement pin and the plurality of engagement posts includes a first engagement post and a second engagement post, and
wherein the first engagement pin abuts the first engagement post and the second engagement pin abuts the second engagement post such that rotational motion of the drive shaft causes rotational motion of the reamer head.

5. The instrument of claim 1 , wherein the distal end of the drive shaft is retained within the at least one engagement aperture of the reamer head proximal to the distal-facing cutting surface when the plurality of engagement pins of the drive shaft are coupled with the plurality of engagement posts of the reamer head.

6. The instrument of claim 1 , wherein the at least one engagement aperture of the reamer head extends from a proximal-facing surface of the body through the distal-facing cutting surface of the body.

7. The instrument of claim 1 , wherein the plurality of engagement posts extend along a longitudinal axis of the at least one engagement aperture.

8. The instrument of claim 1 , wherein the plurality of engagement pins extend substantially perpendicular to the central longitudinal axis of the drive shaft.

9. The instrument of claim 1 , wherein the plurality of engagement pins are circumferentially spaced apart around a distal tip of the drive shaft.

10. The instrument of claim 1 , wherein the drive shaft is cannulated from the proximal end to the distal end.

11. The instrument of claim 1 , wherein the elongate body further comprises:
a handle having an inner throughbore extending therethrough; and
a housing having an inner throughbore extending therethrough,
wherein the housing is configured to be removably coupled to the handle such that the inner throughbore of the handle aligns with the inner throughbore of the housing.

12. An instrument for reaming bone, comprising:
an elongate body having a proximal end, a distal end, and an inner throughbore extending therebetween;
a drive shaft having a proximal end configured to couple to a power source and a distal end including a plurality of engagement pins, the drive shaft configured to extend through the inner throughbore of the elongate body such that the plurality of engagement pins on the distal end of the drive shaft extend distal of the distal end of the elongate body; and
a reamer head configured to be removably coupled to the distal end of the elongate body, the reamer head having a body with a distal-facing cutting surface configured to cut bone and at least one engagement aperture extending through at least a portion of the body, the at least one engagement aperture including a plurality of engagement posts associated therewith,
wherein the plurality of engagement pins of the drive shaft are configured to couple with the plurality of engagement posts of the reamer head such that rotation of the drive shaft causes rotation of the reamer head, and
wherein the drive shaft includes an elongate shaft portion and a distal drive tip configured to selectively couple to a distal end of the elongate shaft portion.

13. The instrument of claim 12 , wherein a central longitudinal axis of the drive shaft extends at an oblique angle relative to a central longitudinal axis of the engagement aperture when the plurality of engagement pins of the drive shaft are coupled with the plurality of engagement posts of the reamer head.

14. The instrument of claim 12 , further comprising a locking collar configured to rotate relative to the elongate body to releasably secure the reamer head to the distal end of the elongate body.

15. The instrument of claim 14 ,
wherein the distal end of the elongate body has a plurality of ball bearings and the locking collar has at least one ramp on an inner surface thereof, and
wherein the ball bearings are configured to slide along the ramp when the locking collar rotates relative to the elongate body.

16. The instrument of claim 12 ,
wherein the plurality of engagement pins include a first engagement pin and a second engagement pin and the plurality of engagement posts includes a first engagement post and a second engagement post, and
wherein the first engagement pin abuts the first engagement post and the second engagement pin abuts the second engagement post such that rotational motion of the drive shaft causes rotational motion of the reamer head.

17. The instrument of claim 12 , wherein the distal end of the drive shaft is retained within the at least one engagement aperture of the reamer head proximal to the distal-facing cutting surface when the plurality of engagement pins of the drive shaft are coupled with the plurality of engagement posts of the reamer head.

18. The instrument of claim 12 , wherein the plurality of engagement posts extend along a longitudinal axis of the at least one engagement aperture.

19. The instrument of claim 12 , wherein the plurality of engagement pins extend substantially perpendicular to the central longitudinal axis of the drive shaft.

20. The instrument of claim 12 , wherein the plurality of engagement pins are circumferentially spaced apart around a distal tip of the drive shaft.

21. The instrument of claim 12 , wherein the drive shaft is cannulated from the proximal end to the distal end.

22. An instrument for reaming bone, comprising:
a reamer head including a distal-facing cutting surface configured to cut bone;
a depth-stop having a body with an inner surface and an outer surface and a pair of spaced apart arms;
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Assignees

• Depuy Ireland Ultd Co

Inventors

• Orphanos Stephen J
• Fernandes Gary
• Amaral Christian
• Amaral Francisco A
• Murphy Raymond F
• Ciocca Robert

Classifications

• A61B17/1684 Primary

  for the shoulder · CPC title

• A61B17/1659 Primary

  Surgical rasps, files, planes, or scrapers · CPC title

• A61B17/162

  Chucks or tool parts which are to be held in a chuck · CPC title

• A61B17/1633

  Sleeves, i.e. non-rotating parts surrounding the bit shaft, e.g. the sleeve forming a single unit with the bit shaft (A61B17/1644 takes precedence) · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title