IMPLANT

• US 20140114425A1
• Filed: 02/14/2012
• Published: 04/24/2014
• Est. Priority Date: 03/29/2011
• Status: Active Grant

• Current Assignee: Depuy Ireland Unlimited Company (Johnson & Johnson)
• Original Assignee: Depuy (Johnson & Johnson)
• Inventors: Ekelund, Anders, Gauthier, Sylvain
• Granted Patent: US 9,622,870 B2
• Time in Patent Office: Days
• US Class Current: 623/19.14
• CPC Class Codes: A61B 17/06166 Sutures suture materials A61L17/00; manufacture of artificial threads D01D; treatment of threads D06M
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/842 Flexible wires, bands or straps A61B17/72, A61B17/82, A61B17/86 take precedence
• CPC Class Codes: A61F 2/30728 Collars; Bone edge protectors A61F2/30734 takes precedence; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/4014 Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/30245 Partial spheres
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30461 sutured, ligatured or stitched
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30729 Separate collars

Abstract

An implant (20), prosthesis and method of use are described. The implant comprises an articulation component (24) having a bearing surface (60) and a reverse surface (62) arranged to couple to a proximal neck portion (26) of an arthroplasty implant (22) coupled to a bone. A collar (28) is arranged to couple to the reverse surface of the articulation component. The collar defines a neck hole (70) arranged to pass around the coupling between the articulation component and the proximal neck portion of the arthroplasty implant. The collar and the articulation component comprise complementary coupling features to secure the collar to the articulation component. The collar further comprises a plurality of attachment portions (74) to couple the collar to bone fragments or soft tissues. The prosthesis comprises the implant and an arthroplasty implant having a distal portion arranged to be coupled to an end of a long bone and a proximal neck portion.

Claims

1. An implant for coupling to a neck of an arthroplasty implant for use in a joint, comprising:

an articulation component comprising a bearing surface and a reverse surface; and

a collar coupled to the reverse surface of the articulation component, the collar having a neck hole sized to pass around the neck of the arthroplasty implant, the collar and the articulation component comprising complementary coupling features to secure the collar to the articulation component;

wherein the collar further comprises a plurality of attachment portions to couple the collar to bone fragments or soft tissues of the joint.

2. The implant of claim 1, wherein the reverse surface of the articulation component comprises a recess and the collar is sized to be received in the recess.

3. The implant of claim 2, wherein the reverse surface of the articulation component comprises a socket protruding from the base of the recess and arranged to receive the end of the neck of the arthroplasty implant, the recess extending annularly between the socket and a rim defining the boundary between the bearing surface and the reverse surface of the articulation component, wherein the neck hole of the collar is sized to pass over the socket.

4. The implant of claim 2, wherein the complementary coupling features comprise the recess and the collar has corresponding screw threads.

5. The implant of claim 2, wherein the complementary coupling features comprise one of the recess and the collar comprising a male part and the other of the recess and the collar comprising a female part, at least one of the male part and the female part being arranged to resiliently deform as the collar is inserted into the recess such that the male part engages the female part to secure the collar to the recess.

6. The implant of claim 5, wherein the collar and the recess respectively comprise first and second anti-rotation features that interlock when the collar is inserted into the recess such that the collar cannot rotate within the recess.

7. The implant of claim 1, wherein the collar is disc shaped and the attachment portions are provided proximal to the periphery of the collar.

8. The implant of claim 1, wherein at least one of the plurality of attachment portions comprises a suture hole arranged to receive and secure a first end of a suture.

9. The implant of claim 1, wherein at least one of the plurality of attachment portions comprises an attached suture extending from the collar.

10. A prosthesis for use in a joint, comprising:

an arthroplasty implant having a distal portion, for coupling to an end of a long bone, and a proximal neck portion;

an articulation component comprising a bearing surface and reverse surface; and

a collar coupled to the reverse surface of the articulation component, the collar having a neck hole sized to pass around the neck portion of the arthroplasty implant, the collar and the articulation component complementary coupling features to secure the collar to the articulation component;

wherein the collar further comprises a plurality of attachment portions to couple the collar to bone fragments or soft tissues of the joint.

11. The prosthesis of claim 10, wherein the distal portion of the arthroplasty implant defines a longitudinal axis, and the neck portion extends along a neck axis that is inclined to the longitudinal axis of the distal portion, and wherein, when the collar is coupled to the articulation component and the articulation component is coupled to the proximal neck portion, the collar lies in a plane that is perpendicular to the neck axis.

12. The prosthesis of claim 10, wherein the arthroplasty implant comprises an arthroplasty plate comprising a fixation plate arranged to be secured to a surface of a bone and a connector assembly extending from the fixation plate to form the proximal neck portion.

13. The prosthesis of claim 12, wherein the connector assembly comprises a barrel extending from the fixation plate, the barrel having a bore that opens through the fixation plate and a connector rod arranged to slide within the bore, and wherein the connector assembly comprises an adjustment mechanism arranged to cause the connector rod to slide into or out of the barrel and a locking mechanism arranged to lock the position of the connector rod within the barrel to rigidly space the articulation component apart from the fixation plate.

14. The prosthesis of claim 12, wherein the fixation plate comprises a head portion couplable to the connector assembly and an elongate body portion arranged to extend distally along the lateral surface of the bone, the elongate body portion having a plurality of fastener holes arranged to receive bone fasteners for securing the fixation plate to the bone.

15. The prosthesis of claim 14, the fixation plate head portion has at least one suture hole arranged to receive a suture extending from the collar for securing bone fragments and soft tissues to the fixation plate and the collar.

16. The prosthesis of claim 10, wherein the proximal neck portion comprises a tapered portion and the reverse surface of the articulation component comprises a corresponding tapered socket arranged such that when the end of the proximal neck portion is inserted into the tapered socket a taper lock forms securing the articulation component to the arthroplasty implant.

17. A surgical method comprising the steps of:

removing at least part of an articulating surface at an end of a bone;

coupling a distal portion of an arthroplasty implant to the end of the bone, the arthroplasty implant comprising a proximal neck portion extending from the distal portion;

securing bone fragments to a collar with sutures extending between the bone fragments or attached soft tissue and at least one of a plurality of attachment portions formed in the collar;

coupling complementary features of the collar and a reverse surface of an articulation component together to secure the collar to the reverse surface, the articulation component further comprising a bearing surface; and

coupling the articulation component to the proximal neck portion of the arthroplasty plate such that a neck hole of the collar passes around the coupling between the proximal neck portion of the arthroplasty implant and the articulation component.

18. The surgical method of claim 17, wherein the step of coupling the distal portion of an arthroplasty implant to the end of the bone comprises securing a fixation plate forming the distal part of the arthroplasty implant to a lateral surface of the fractured end of the bone, the fixation plate being coupled to a connector assembly defining the proximal neck portion and comprising a barrel with a bore and a connector rod, the connector rod being arranged to slide within the bore of the barrel;

sliding the connector rod into or out of the barrel to adjust the length of the connector rod extending from the barrel; and

locking the position of the connector rod within the barrel to rigidly space the articulation component apart from the fixation plate.

19. The surgical method of claim 18, wherein the fixation plate further comprises a head portion proximal to the barrel, the head portion defining at least one suture hole, wherein the method further comprises the step of threading sutures between the attachment portions of the collar and the at least one suture hole in the head portion of the fixation plate, the sutures passing through bone fragments or attached soft tissue to secure the bone fragments to the collar and the fixation plate.