Shoulder implant for glenoid replacement and methods of use thereof

• US 20060195194A1
• Filed: 02/25/2005
• Published: 08/31/2006
• Est. Priority Date: 02/25/2005
• Status: Active Grant

• Current Assignee: Shoulder Innovations LLC
• Original Assignee: Shoulder Innovations LLC
• Inventors: Gunther, Stephen B.
• Granted Patent: US 8,007,538 B2
• Time in Patent Office: Days
• US Class Current: 623/19.13
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30118 concentric circles
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30574 with an integral complete or partial collar or flange
• CPC Class Codes: A61F 2002/30606 Sets comprising both cemented and non-cemented endoprostheses
• CPC Class Codes: A61F 2002/30609 Sets comprising both coated and non-coated endoprostheses
• CPC Class Codes: A61F 2002/3069 : Revision endoprostheses
• CPC Class Codes: A61F 2002/30822 : Circumferential grooves
• CPC Class Codes: A61F 2002/30827 : Plurality of grooves
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30884 : Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/4033 : with an integral complete or partial peripheral collar at its base
• CPC Class Codes: A61F 2002/4051 : Connections of heads directly to shafts
• CPC Class Codes: A61F 2002/4062 : Proximal or metaphyseal parts of shafts
• CPC Class Codes: A61F 2002/4631 : the prosthesis being specially adapted for being cemented
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

The invention features a glenoid (shoulder socket) implant prosthesis, a humeral implant prosthesis, devices for implanting glenoid and humeral implant prostheses, and methods of their use for the treatment an injured or damaged shoulder.

Claims

1. An inset glenoid implant comprising a body portion having (i) a smooth concave lateral articulating surface adapted to be engaged by a humeral component, and (ii) a convex or flat medial surface adapted for positioning within a cavity reamed in the glenoid and adapted for securing within said glenoid cavity, wherein, when implanted, the glenoid implant is circumferentially surrounded by cortical bone of the glenoid.

2. The inset glenoid implant of claim 1, wherein said implant further comprises a short peg on the medial side extending centrally outward along an axis from the convex or flat medial surface of the glenoid implant.

3. The inset glenoid implant of claim 2, wherein said short peg is 8 mm or less in length.

4. The inset glenoid implant of claim 1, wherein said implant is shaped and sized to fit within the glenoid cavity of a patient.

5. The inset glenoid implant of claim 4, wherein said implant has a circular or oval shape.

6. The inset glenoid implant of claim 1, wherein said implant is implanted within the glenoid bone stock.

7. The inset glenoid implant of claim 1, wherein said implant is manufactured using polyethylene, metal, ceramic, or a combination thereof.

8. A humeral implant for replacing a portion of a humerus, the implant comprising a stem that is less than 70 mm in length and less than 40 mm in width anterior to posterior, wherein said stem comprises a distal end portion and a proximal end portion, the distal end portion being sized to be received in the shaft of a humerus and the proximal end portion having a fin positioned to fix said implant in said humerus and a support surface extending radially from said stem and being adapted for engagement by an artificial humeral head, and wherein the support surface comprises a central opening extending down through the stem and being sized to receive a morse taper of said artificial humeral head.

9. The implant of claim 8, wherein said implant further comprises a collar positioned between the upper planar surface and the artificial humeral head.

10. The implant of claim 9, wherein said collar comprises a central opening sized to permit receipt of a morse taper from the artificial humeral head.

11. The implant of claim 8, wherein said stem defines a longitudinal axis and the planar surface extends from 45°

to 60°

to the axis of the stem.

18. The method of claim 9, wherein said glenoid implant is implanted inset to said glenoid, wherein said glenoid implant is circumferentially surrounded by cortical bone of said glenoid.

12. A humeral head cutting jig sized and shaped to be placed along the anatomic neck of a humeral head, wherein said jig fully or partially encircles the humeral head and comprises one or more apertures for securing the jig to the humeral head and a handle means.

13. The jig of claims 12, wherein the apertures for securing the jig to the humeral head are sized and shaped to receive K-wire, pins, or screws.

14. A method for repairing a damaged shoulder joint of a patient, said method comprising:

(a) producing an incision of between 8 to 9 centimeters to expose the humerus and glenoid, wherein the pectoralis tendon and the majority of the inferior capsule remain intact during said exposure;

(b) preparing the glenoid by reaming; and

(c) implanting a glenoid implant at the site of said reamed glenoid, such that the glenoid implant articulates with the humerus.

15. The method of claim 14, wherein the glenoid labrum is intact at the completion of step (a).

16. The method of claim 14, wherein said method further comprises implanting a humeral implant to replace a humeral head of said patient'"'"'s humerus, wherein said humeral implant comprises a stem that is less than 70 mm in length and less than 40 mm in width anterior to posterior, wherein said stem comprises a distal end portion and a proximal end portion, the distal end portion being sized to be received in the shaft of a humerus and the proximal portion having a fin positioned to fix said implant in said humerus and a support surface extending radially from said stem and being adapted for engagement by humeral head means, and wherein the support surface comprises a central opening extending down through the stem and being sized to receive a morse taper of said humeral head means;

and

a humeral head means engaged to said humeral implant.

17. The method of claim 14, wherein said damage is caused by arthritis or injury.

19. The method of claim 14, wherein said glenoid implant further comprises a short peg on the medial surface of said glenoid implant.

20. The method of claim 14, wherein said short peg is less than or equal to 8 millimeters (mm) in length.

21. The method of claim 14, wherein said incision is 9 cm or less in length.

22. The method of claim 14, wherein said glenoid implant is secured to said glenoid using cement or by press-fit.

23. The method of claim 22, wherein said glenoid implant is further secured using one or more surgical screws.

24. The method of claim 16, wherein said humeral implant is secured using bone cement or by press-fit.

25. A surgical drill for preparing a scapula for implantation of a glenoid implant, said drill comprising a power means coupled to an extension rod which is connected to a 90°

angle drilling attachment, wherein said 90°

drilling attachment is adapted to receive a short drill bit; and

wherein said surgical drill is prepared for use in the surgical field by sterilization.

26. The surgical drill of claim 25, wherein said extension rod is less than 18 cm long.

27. The surgical drill of claim 26, wherein said extension rod is at least 10 cm long.

28. The surgical drill of claim 25, wherein said drill bit is less than 75 mm long.

29. The surgical drill of claim 28, wherein said drill bit is at least 10 mm long.

30. The surgical drill of claim 25, wherein the diameter of said drill bit is less than 10.0 mm.

31. The surgical drill of claim 30, wherein the diameter of said drill bit is at least 1.5 mm long.

32. The surgical drill of claim 25, wherein said drill weights less than 200 grams.