Shape-fit glenoid reaming systems and methods

Patent metadata

Field	Value
Publication number	US-9877737-B2
Application number	US-201715446423-A
Country	US
Kind code	B2
Filing date	Mar 1, 2017
Priority date	Mar 18, 2014
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Disclosed herein are systems and methods for securing a glenoid baseplate to a resected glenoid cavity in a preoperatively planned position. Image information obtained from the glenoid cavity and surrounding scapula is analyzed to determine the location of optimal bone stock. A guide is designed based on the image information, the guide having a patient specific contact surface that contacts a surface of the bone in a preoperatively planned position. The guide is designed to have a cannulated portion including a specific length. A marking pin having at least one reference feature is drilled into the glenoid cavity. The length of the cannulated portion of the guide is based on a location of the at least one reference feature on an outer surface of the marking pin. A cannulated reamer guided by the marking pin is then used to resect the glenoid cavity until a stop surface of the cannulated reamer contacts an end of the marking pin.

First claim

The invention claimed is:

1. A system for resecting a preoperatively planned depth into bone comprising:
a guide having a patient specific contact surface that contacts a surface of the bone in a preoperatively planned position, the guide having a cannulated portion including a length;
a marking pin having first and second ends, the first end adapted to be drilled into the bone a linear marking distance, the preoperatively planned depth being defined by a depth the marking pin is drilled into the bone; and
a cannulated reamer having a shaft portion coupled to a reamer portion and defining a linear reamer distance,
wherein the length of the cannulated portion of the guide is based on a location of the at least one reference feature on the outer surface of the marking pin, and
wherein the linear reamer distance is substantially the same as the linear marking distance.

2. The system of claim 1 , wherein the marking pin has at least one reference feature on an outer surface thereof, the at least one reference feature of the marking pin lying adjacent to a receiving end of the cannulated portion when the marking pin is received within the cannulated portion of the guide and the marking pin is drilled into bone the preoperatively planned depth.

3. The system of claim 1 , wherein the shaft portion has an internal guide portion and the reamer portion includes a central aperture.

4. The system of claim 3 , wherein the marking pin is adapted to be inserted through the central aperture and into the internal guide portion.

5. The system of claim 4 , wherein the internal guide portion includes a stop surface.

6. The system of claim 5 , wherein the linear reamer distance is defined by a distance between an outer surface of the reamer portion adjacent the central aperture thereof and the stop surface of the guide portion of the shaft portion.

7. The system of claim 6 , wherein the linear marking distance is defined by the distance between the second end of the marking pin and a location of a desired reaming depth inside the bone.

8. The system of claim 7 , wherein a linear resection depth is defined by the distance between the surface of the bone prior to resection and the location of the desired reaming depth inside the bone.

9. The system of claim 1 , wherein the cannulated portion of the guide forms an internal wall having a receiving end and an exiting end, the internal wall adjacent the receiving end of the cannulated portion having a protrusion extending outwardly therefrom.

10. The system of claim 9 , wherein the at least one reference feature on the outer surface of the marking pin is an indentation such that when the marking pin is received in the receiving end of the cannulated portion of the guide and translates with respect to the cannulated portion until the protrusion engages the indentation to inhibit the translation of the marking pin with respect to the cannulated portion.

11. A system for resecting a preoperatively planned depth into bone comprising:
a guide having a patient specific contact surface that contacts a surface of the bone in a preoperatively planned position, the guide having a cannulated portion including a length;
a marking pin having first and second ends, the preoperatively planned depth being defined by a depth the marking pin is drilled into the bone; and
a cannulated reamer having a shaft portion coupled to a reamer portion and defining a linear reamer distance,
wherein the length of the cannulated portion of the guide is based on a location of the at least one reference feature on the outer surface of the marking pin, and
wherein the linear reamer distance is substantially the same as a linear marking distance defined by a linear distance between the second end of the marking pin and a preoperatively planned resection depth into the bone.

12. The system of claim 11 , wherein the marking pin has at least one reference feature on an outer surface thereof, the at least one reference feature of the marking pin lying adjacent to a receiving end of the cannulated portion when the marking pin is received within the cannulated portion of the guide and the marking pin is drilled into bone the preoperatively planned resection depth.

13. The system of claim 11 , wherein the shaft portion has an internal guide portion and the reamer portion includes a central aperture.

14. The system of claim 13 , wherein the marking pin is adapted to be inserted through the central aperture and into the internal guide portion.

15. The system of claim 14 , wherein the internal guide portion includes a stop surface.

16. The system of claim 15 , wherein the linear reamer distance is defined by a distance between an outer surface of the reamer portion adjacent the central aperture thereof and the stop surface of the guide portion of the shaft portion.

17. The system of claim 16 , wherein a linear resection depth is defined by the distance between the surface of the bone prior to resection and a location of the preoperatively planned resection depth inside the bone.

18. The system of claim 11 , wherein the cannulated portion of the guide forms an internal wall having a receiving end and an exiting end.

19. The system claim of 18 , wherein the internal wall is adjacent the receiving end of the cannulated portion having a protrusion extending outwardly therefrom.

20. The system of claim 19 , wherein the at least one reference feature on the outer surface of the marking pin is an indentation such that when the marking pin is received in the receiving end of the cannulated portion of the guide and translates with respect to the cannulated portion until the protrusion engages the indentation to inhibit the translation of the marking pin with respect to the cannulated portion.

Assignees

• Howmedica Osteonics Corp

Inventors

• Olson Nicholas

Classifications

• A61B17/1684

  for the shoulder · CPC title

• A61B17/1739

  specially adapted for particular parts of the body · CPC title

• A61F2/4081

  Glenoid components, e.g. cups · CPC title

• A61B17/1778 Primary

  for the shoulder · CPC title

• A61B2090/062

  penetration depth · CPC title