Hinged joint system

Patent metadata

Field	Value
Publication number	US-2016287399-A1
Application number	US-201615185701-A
Country	US
Kind code	A1
Filing date	Jun 17, 2016
Priority date	Dec 21, 2001
Publication date	Oct 6, 2016
Grant date	—

Abstract

Methods, systems, and devices for replacement of a joint with a prosthetic system that replicates the natural kinematics of the joint is disclosed. A prosthetic system according to one embodiment includes a tibial component having a tibial plateau and a tibial stem portion, the tibial plateau having a top side and a bottom side, a tibial insert, with a bearing surface, adapted to be positioned on the top side of the tibial plateau, a femoral component having a base portion and a central housing, the femoral component having an axis of extension-flexion rotation, the base portion having a pair of condyles, an a mechanical linkage component linking the tibial component with the femoral component and with the tibial insert in between the tibial component and the femoral component, so that there is a center of contact between the condyles and the bearing surface.

First claim

What is claimed is:

1 . A prosthetic system for performing the function of a knee joint, comprising:
(a) a tibial component having a tibial plateau and a tibial stem portion, the tibial plateau having a top side and a bottom side; (b) a post having a proximal end and a distal end, the post adapted to project from the top side of the tibial plateau; (c) a tibial insert having an aperture, the tibial insert adapted to be positioned on the top side of the tibial plateau with the tibial insert aperture adapted to receive the post; (d) a femoral component having a base portion and a central housing having a femoral stem portion, the base portion having a pair of condyles and two posteriorly extending lobes; (e) an axle adapted to connect to the lobes and extend between the lobes; and (f) a link having an anterior end and a posterior end, the link adapted to be connected to the axle at the posterior link end and to receive the post at the anterior link end.

2 . The prosthetic system of claim 1 , further comprising an anterior aperture in the link and a cap adapted to mount on the post, the cap having a lip portion that extends beyond the diameter of the proximal end of the post, the anterior link aperture having a smaller diameter at its distal end, whereby the lip portion engages the smaller diameter of the anterior link aperture and prevents distraction of the prosthetic system.

3 . The prosthetic system of claim 2 , further comprising a cap retaining fastener for fastening the cap to the post.

4 . The prosthetic system of claim 1 , further comprising a posterior aperture in the link and two bushings adapted to fit in the posterior link aperture and receive the axle.

5 . The prosthetic system of claim 1 , further comprising two axle retaining fasteners adapted to retain the axle in place.

6 . The prosthetic system of claim 5 , wherein the axle retaining fasteners are clip-type fasteners.

7 . The prosthetic system of claim 1 , further comprising a Morse taper disposed on the distal end of the tibial stem portion.

8 . The prosthetic system of claim 7 , wherein the Morse taper is adapted to be inserted into an intramedullary canal of a patient's tibia.

9 . The prosthetic system of claim 7 , further comprising a long tibial stem adapted to connect to the distal end of the Morse taper.

10 . The prosthetic system of claim 1 , further comprising a tibial body segment adapted to connect to the tibial stem portion.

11 . The prosthetic system of claim 1 , further comprising a Morse taper disposed on the proximal end of the femoral stem portion.

12 . The prosthetic system of claim 11 , wherein the Morse taper is adapted to be inserted into an intramedullary canal of a patient's femur.

13 . The prosthetic system of claim 11 , further comprising a long femoral stem adapted to connect to the proximal end of the Morse taper.

14 . The prosthetic system of claim 1 , further comprising a femoral body segment adapted to connect to the femoral stem portion.

15 . The prosthetic system of claim 1 , wherein the tibial insert has a posterior notch and the top side of the tibial plateau has a posterior stop, whereby the tibial insert's rotation is limited by the posterior stop.

16 . The prosthetic system of claim 15 , further comprising a bioresorbable bumper adapted to fit in the notch and surround the stop to prevent rotation of the tibial insert.

17 . The prosthetic system of claim 1 , wherein a first distance between the center point of the axle and the distal portion of the condyles is different than a second distance between the center point of the axle and the posterior portion of the condyles.

18 . The prosthetic system of claim 2 , wherein the femoral component is pre-assembled and the appropriately sized tibial insert and corresponding cap are selected during the replacement of the knee joint.

19 . The prosthetic system of claim 1 , wherein the link links the tibial component with the femoral component and with the tibial insert in between the tibial component and the femoral component so that there is a center of contact between the condyles and a bearing surface of the tibial insert, the link adapted to move in the superior-inferior directions and restrained from movement in the anterior-posterior directions, wherein the center of contact between the condyles and bearing surface moves in the anterior-posterior direction as the femoral component moves through extension and flexion.

20 . The prosthetic system of claim 19 , wherein the link and tibial insert are adapted to rotate about an inferior-superior axis.

Assignees

• Smith & Nephew Inc

Inventors

• Crabtree Jr Paul Charles
• Marik Greg
• Salehi Abraham Biglari
• Weaver Kevin
• Langlais Frantz
• Huten Denis
• Harrison Dennis

Classifications

• A61F2002/30495

  using a locking ring · CPC title

• A61B17/1659

  Surgical rasps, files, planes, or scrapers · CPC title

• A61F2220/0033

  made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit · CPC title

• A61F2220/0041

  using additional screws, bolts, dowels or rivets, e.g. connecting screws · CPC title

• A61F2/3845 Primary

  allowing only for single rotation · CPC title