Ancillary tool for positioning a glenoid implant

• US 20040230197A1
• Filed: 03/08/2004
• Published: 11/18/2004
• Est. Priority Date: 03/10/2003
• Status: Active Grant

• Current Assignee: Tornier Incorporated
• Original Assignee: Tornier Incorporated
• Inventors: Tornier, Alain, Ekelund, Anders
• Granted Patent: US 7,887,544 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/1778 for the shoulder

Abstract

This ancillary tool (1) comprises a plate (4) which defines a convex surface (12) intended to bear against the glenoid cavity of a patient'"'"'s scapula (2) and which forms a directional guide for a drilling, fashioning or like member. To allow the surgeon to apply this member in a chosen direction (C—C), the tool (1) comprises means (6) for adjusting the position of the guide with respect to the plate (6).

Claims

1. Ancillary tool for positioning a glenoid implant, of the type comprising a plate (4;

52) which defines a bearing surface (12;

56) intended to abut against the glenoid cavity of a patient'"'"'s scapula (2) and which forms a directional guide for a drilling, fashioning or like member, characterized in that it comprises means (6;

70) for adjusting the direction of the guide with respect to the plate (4;

52)

2. Tool according to claim 1, characterized in that the means (6;

70) for adjusting the direction of the guide are adapted to be received and immobilized in a through opening (22;

60) formed in the plate (4;

52) and opening out on the bearing surface (12;

56) of the plate.

3. Tool according to claim 1 or 2, characterized in that the means (6;

70) for adjusting the direction of the guide comprise a barrel (30) provided with a plurality of rectilinear through holes (36), one of said holes forming the directional guide for the drilling, fashioning or like member.

4. Tool according to claim 3, characterized in that the barrel (30) comprises a tubular body (32) closed at one of its ends by a bottom (34), the through holes (36) being formed in the bottom and opening out inside the tubular body, which tubular body (32) presents in transverse section an outer profile adapted to cooperate with a through opening (22) of the plate (4) so as to immobilize the barrel (30) in this opening.

5. Tool according to claim 3 or 4, characterized in that the axes of the holes (36) are

substantially concurrent at a point (P) located substantially in the geometrical extension of the convex face (12) of the plate (4).

6. Tool according to any one of claims 3 to 5, characterized in that a first series (38) of holes (36) in the barrel (30) is aligned along a first plane (X-X, Z-Z) and a second series (40) of other holes in the barrel is aligned along a second plane (Y-Y, Z-Z) substantially at right angles to the first plane.

7. Tool according to claim 6, characterized in that, in each of the first and second series of holes, the axes of the holes (36) located on the same side of the central axis (Z-Z) of the barrel (30) are offset angularly with respect to one another by a substantially constant value.

8. Tool according to one of claims 6 or 7, characterized in that other series (42, 44, 46, 48) of holes (36) are provided in the quadrants defined by the first (38) and second (40) series of holes.

9. Tool according to claim 1 or 2, characterized in that the means (6;

70) for adjusting the direction of the guide comprise, on the one hand, an element (72) mobile with respect to the plate (52) and, on the other hand, an element (76) for immobilizing the element (72) mobile with respect to the plate, the mobile element being provided with a rectilinear through bore (74) adapted to form the directional guide for the drilling, fashioning or like member.

10. Tool according to claim 9, characterized in that the direction (Z-Z) of the bore (74) of the mobile element (72) is continuously adjustable.

11. Tool according to claim 9 or 10, characterized in that the mobile element (72) presents a

surface (72a) adapted to cooperate with an associated surface (64) of the plate (52).

12. Tool according to claim 11, characterized in that said surface (72a) of the mobile element (72) adapted to cooperate with the associated surface (64) of the plate (52) is substantially spherical.

13. Tool according to any one of claims 8 to 11, characterized in that it further comprises a tool (86) for controlling the immobilizing element (76).

14. Tool according to any one of claims 8 to 12, characterized in that it further comprises means (88) for displacing and positioning the mobile element (72) with respect to the plate (52), adapted to lead the bore (74) of the mobile element substantially in a chosen direction (C—

C).

15. Tool of claim 14, characterized in that the means (88) for displacing and positioning the mobile element (72) comprise a rigid retaining support (90) for the plate (52) and a rod (92) for driving the mobile element, adapted to be displaced with respect to the rigid support, said support being provided with two protractors (106, 112) adapted to plot the angular position of the rod (92) in two planes substantially perpendicular to each other.

16. Method for positioniong a glenoid implant, in which:

at least one scanner image or the like of a patient'"'"'s scapula (2) is available,

a preferential direction (C—

C) of application on the scapula (2) of a drilling, fashioning or like member is determined,

an ancillary guiding tool (1;

50) which comprises a plate (4;

52) forming a directional guide

for said drilling member and means (6;

70) for adjusting the direction of the guide with respect to the plate, are used,

a surface (12;

56) of the plate (4;

52) is applied on the glenoid cavity of the scapula (2),

the drilling member is introduced in the guide of which the direction is adjusted to the preferential direction (C—

C), and

the drilling member is actuated so as to act on the scapula (2) in the preferential direction (C—

C).

17. Method according to claim 16, in which the adjusting means (6) of the ancillary guiding tool (1) comprise a barrel (30) provided with a plurality of rectilinear through holes (36), and in which, after the plate (4) has been applied on the glenoid cavity of the scapula (2), the drilling member is introduced in the hole which, among the through holes (36) of the barrel (30), extends in a direction close to or the direction the closest to the preferential direction (C—

C).

18. Method according to claim 16, in which the adjusting means (70) of the ancillary guiding tool (50) comprise an element (72) mobile with respect to the plate (52) and an element (76) for immobilizing the element mobile with respect to the plate, said mobile element (72) being provided with a rectilinear through bore (74), and in which, before the plate (52) has been applied on the glenoid cavity of the scapula (2), the mobile element (72) is positioned with respect to the plate (52) so as to lead the bore (74) of the mobile element substantially in the preferential direction (C—

C), then the element mobile with respect to the plate is immobilized via the immobilizing element (76).