US 7,396,357 B2Granted

Ancillary tool and method for positioning a prosthetic acetabulum of a hip prosthesis

AssigneeTornier SAS

InventorsAlain Tornier, Jean-Pierre Berger, Patrick Reynaud, Arnaud Godeneche, Christophe Hulet, Jean-Claude Panisset, Philippe Deroche, Jean Puget, André Ferreira

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Abstract

An ancillary tool and method for manipulating and implanting a prosthetic acetabulum including a tool provided, adjacent a distal part, with a head for interacting with an endpiece that is used for gripping the acetabulum and, in its proximal part, with a surface for application of a force along the handle. The endpiece is preferably removably connected to the distal end of the handle. The endpiece includes an elastically deformable ring having an outer face for expanding radially outwardly to initially grip the acetabulum and an opposite face for interaction with the head of the handle, such that upon a force being applied to drive the head into a cavity of the endpiece, the ring is radially expanded to expand the acetabulum in place after which the ring elastically returns to its original shape as the head is removed from the cavity.

Claims17

Dependent claims

A method for positioning a prosthetic acetabulum with inner and outer surfaces in an anatomical or prosthetic cavity of a patient's hip, comprising the steps of:

providing a tool having a handle for manipulating the acetabulum, the handle, including a rod and a head, the head adapted to cooperatively engage inner faces of an elastically deformable ring including a plurality of petals in an endpiece that is used to grip the inner surface of the acetabulum and which endpiece is removably secured to the distal end of the handle, the petals of the elastically deformable ring including outer surfaces adapted to wedge against the inner surface of the acetabulum and opposite inner surfaces adapted to interact said endpiece with said handle, wherein said endpiece includes a supple part and a rigid part secured to the supple part, wherein the rigid part includes structure for removably securing the rod to the endpiece and wherein said handle further includes elements for applying a first force to urge said head into cooperative engagement with said inner surfaces of said petals of the elastically deformable ring to thereby radially expand said petals of the elastically deformable ring with respect to a longitudinal axis of said endpiece wherein said elements include a threaded portion on the rod, a grip screwed on the threaded section and a movable sleeve fitted between the grip and the head;
placing said endpiece in engagement with said head of said handle and said head within said acetabulum and providing said first force between said head and said endpiece so as to provoke radial elastic deformation of the petals of said elastically deformable ring to thereby grip said acetabulum by said endpiece;
positioning said acetabulum in said cavity of said patient's hip;
applying a second force along said handle to cause said acetabulum to seat within said cavity of said patient's hip;
disengaging said head from said endpiece and releasing said first force to allow the petals of said elastically deformable ring to recover to a non-expanded configuration;
and
withdrawing said endpiece from the positioned acetabulum.

4 more elements

A method of positioning a prosthetic acetabulum with inner and outer surfaces in an anatomical or prosthetic cavity of a patient's hip, comprising the steps of:

(a) contacting the prosthetic acetabulum with a tool having a head movably mounted on a rod adapted to engage an endpiece removably secured to the rod, wherein the endpiece includes a plurality of petals in an elastically deformable ring, wherein the petals have inner surfaces adapted to contact the head and outer surfaces adapted to contact an inner surface of the prosthetic acetabulum wherein said endpiece includes a supple part and a rigid part secured to the supple part, wherein the rigid part includes structure for removably securing the rod to the endpiece;
(b) forcing the head into engagement with the inner surfaces of the petals in deformable ring to radially wedge the outer surfaces of the petals of the deformable ring against the inner surface of the prosthetic acetabulum to secure the prosthetic acetabulum to the tool wherein the step of forcing the head into engagement with the inner surfaces of the petals of the deformable ring includes rotating a grip screwed on a threaded section of the rod in a first direction to urge a movable sleeve fitted between the grip and the head toward a distal position on the rod;
(c) positioning the outer surface of the prosthetic acetabulum in a cavity in a patient's hip;
(d) applying a force to the tool to seat the prosthetic acetabulum in the cavity;
(e) releasing the head from engagement with the petals of the deformable ring to allow the deformable ring to unsecure the prosthetic acetabulum from the tool;
and
(f) withdrawing the tool from the positioned prosthetic acetabulum.

4 more elements

A method of positioning a prosthetic acetabulum with inner and outer surfaces in an anatomical or prosthetic cavity of a patient's hip, comprising the steps of:

(a) providing a tool having a handle that includes a rod having a threaded medial portion and a threaded distal portion, a movable sleeve adapted to move in distal and proximal directions on the rod, a grip adapted to rotate on the threaded medial portion of the rod to move the sleeve, a movable head adapted to move in distal and proximal direction on the rod and to engage an endpiece, and an endpiece having an elastically deformable ring including a plurality of petals mounted on a rigid part that contains a threaded portion to secure the endpiece to the rod, wherein the petals have outer surfaces adapted to engage the inner surface of a prosthetic acetabulum when the head is forced on inner surfaces of the petals wherein said endpiece includes a supple part and a rigid part secured to the supple part, wherein the rigid part includes structure for removably securing the rod to the endpiece;
(b) placing the endpiece of the tool into the prosthetic acetabulum;
(c) forcing the head into the inner surfaces of the petals by rotating the grip in a first direction to radially expand the petals to an expanded configuration and secure the endpiece in the prosthetic acetabulum by gripping the inner surface of the prosthetic acetabulum with the outer surfaces of the petals;
(d) positioning the prosthetic acetabulum in a cavity of a patient's hip;
(e) applying an impaction force to the tool to seat the prosthetic acetabulum in the cavity;
(f) disengaging the head from the inner surface of the petals by rotating the grip in a second direction to allow the petals to recover to a non-expanded configuration;
and
(g) withdrawing the tool from the prosthetic acetabulum.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/758,280Filed 16 Jan 2004
Priority: FR 03 0052417 Jan 2003
Published: US 2004/0215200 A128 Oct 2004
Granted: 8 Jul 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

A61F 2/4609
For insertion or extraction of endoprosthetic joints or of accessories thereof: of acetabular cups
A61F 2/34
For the hip: acetabular cups
A61F 2/4603
Special tools for implanting artificial joints: for insertion or extraction of endoprosthetic joints or of accessories thereof
A61F 2002/30484
Locked by an additional locking mechanism: mechanically expandable devices located on the first prosthetic part for locking into or onto the…