Granted Patent B2

US 12,622,711 · App. 18/579,359 · Granted May 12, 2026

Inventors: Michele Pressacco (Martignacco, IT); Andrea Fattori (Cividale del Friuli, IT); Antony Pranzetti (Sommacampagna, IT)

Assignee: Limacorporate S.p.A.

A61B17/1778A61F2/4612A61F2002/4628

Abstract

Claims (19)

1 . A positioning device for implantation of prosthesis in a long bone, the positioning device comprising:

at least one centering element including a channel configured to house an intramedullary nail;

a support element configured to hold a reference mask on a plane defined by a resected metaphysis of said long bone;

an adjustment element configured to connect said centering element and said support element, wherein said adjustment element further comprises a displacement device configured to provide a controlled offset to said support element, said displacement device including a first slide translating in a first direction parallel to said plane for displacing said reference mask in said first direction parallel to said plane, and said displacement device including a second slide translating in a second direction parallel to said plane for displacing said reference mask in the second direction parallel to said plane, the second direction being different to the first direction.

2 . The positioning device according to claim 1 , wherein said first slide includes a first adjustment system, and said second slide includes a second adjustment system.

3 . The positioning device according to claim 2 , wherein said first slide comprises a first threaded element controlled by the first adjustment system, and said second slide comprises a second threaded element controlled by the second adjustment system.

4 . The positioning device according to claim 2 , wherein said first adjustment system and said second adjustment system comprise predetermined position markings for providing said controlled offset by displacing said reference mask at predetermined increases, both with positive displacement and with negative displacement with respect to an axis of said centering element.

5 . The positioning device according claim 1 , wherein said adjustment element is laterally offset with respect to said centering element and to said support element to allow an unobstructed upper access to said reference mask.

6 . The positioning device according to claim 1 , further comprising a reference mask removably associated with said support element.

7 . The positioning device according to claim 6 , wherein said reference mask comprises a main seat configured to implant a metaphyseal reference on said resected metaphysis.

8 . The positioning device of claim 7 , wherein the metaphyseal reference comprises a Kirschner wire.

9 . The positioning device according to claim 7 , wherein said reference mask further comprises a plurality of auxiliary seats configured to house temporary fastening pins, for holding in position said reference mask once separated from said support element.

10 . The positioning device according to claim 6 , wherein said reference mask comprises a semi-circular portion matching an external dimension of an associated prosthesis component.

11 . The positioning device according to claim 10 , wherein said reference mask further comprises a plurality of references configured externally to said semi-circular reference and indicating a minimum distance of said reference mask with respect to a metaphyseal cortex of said long bone.

12 . The positioning device according to claim 6 , wherein the reference mask is provided in modular sizes corresponding to sizes of prosthesis modular components.

13 . The positioning device according to claim 1 , wherein said adjustment element mechanically connects said centering element and said support element providing a spatial angle with respect to an axis of said centering element so as to allow displacing said reference mask in a tangential manner over said plane, said plane being a resection plane of said metaphysis inclined at the spatial angle with respect to the axis of said centering element.

14 . The positioning device according to claim 13 , wherein said adjustment element provides a L-shaped structure, a first end of said adjustment element defining said spatial angle, a second end of said adjustment element being connected to said support element and being perpendicular to a plane of said reference mask.

15 . The positioning device according to claim 1 , wherein a spatial angle between said centering element and said support element corresponds to a spatial angle between a stem of an associated prosthesis component and an upper housing of the associated prosthesis component.

16 . The positioning device according to claim 1 , wherein the first direction and the second direction are perpendicular to each other.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (14)