Rim anchoring systems for flexible surgical implants for replacing cartilage

• US 9,066,802 B2
• Filed: 03/13/2014
• Issued: 06/30/2015
• Est. Priority Date: 01/19/2011
• Status: Active Grant

• Current Assignee: Formae, Inc.
• Original Assignee: Formae, Inc.
• Inventors: Mansmann, Kevin A.
• Primary Examiner(s): Willse, David H
• Assistant Examiner(s): BLANCO, JAVIER G
• Application Number:
  US14/208,327
• Publication Number:
  US 20140207234A1
• Time in Patent Office: 474 Days
• Field of Search: 623/14.12
• US Class Current: 1/1
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/3872 Meniscus for implantation between the natural bone surfaces
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2002/2821 Bone stimulation by electromagnetic fields or electric current for enhancing ossification
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30115 circular-O-shaped
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30299 umbrella-shaped or mushroom-shaped
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/30459 stapled
• CPC Class Codes: A61F 2002/30461 sutured, ligatured or stitched
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/30738 : Sleeves
• CPC Class Codes: A61F 2002/30757 : made of a sheet covering the natural articular surface, e.g. cap
• CPC Class Codes: A61F 2002/3085 : with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2002/30878 : with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2210/0019 : operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2220/0016 : with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0066 : stapled
• CPC Class Codes: A61F 2220/0075 : sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0093 : Umbrella-shaped, e.g. mushroom-shaped

Abstract

Flexible cartilage-replacing implants are disclosed that use either or both of (1) enlarged peripheral rim components, and/or (2) elongated flexible reinforcing members that are embedded around the peripheral edge of an implant device. These types of anchoring devices, especially when used in combination, can provide flexible implants that can be implanted arthroscopically into synovial joints, for complete replacement of damaged cartilage segments.

Claims

1. A surgical implant assembly, configured for affixing a hyaline cartilage replacement implant on a bone surface adjacent to a machined rounded groove with an edge formed in a bone of a knee joint, the implant assembly comprising:

a flexible hyaline cartilage replacement implant having a smooth lubricious articulating surface on an exposed side and an enlarged rounded rim protruding on a side opposite from the exposed side, wherein the enlarged rim is dimensioned and adapted to fit into the groove for affixing the flexible cartilage replacement implant in place on the surface; and

an anchoring subassembly, said anchoring subassembly comprising;

an anchoring washer component with an open center area, the washer component comprising anchoring screws or pins and configured for permanent attachment to the bone surface such that an edge of the washer component extends along an edge of the groove; and

a ring-shaped trench supplementing component affixed to the washer component, the trench supplementing component dimensioned for extending beyond edge of the groove;

wherein the trench supplementing component and the enlarged rim are dimensioned such that the enlarged rim is snapped resiliently over the trench supplementing component in order to be fit into the groove, whereby the enlarged rim becomes locked in the groove,

wherein the machined groove extends around a periphery of the bone surface, wherein the washer component is disposed within said periphery and the trench supplementing component extends outwardly from the washer component, and wherein the enlarged rim of the implant snaps resiliently over the trench supplementing component into the groove.

2. The surgical implant assembly of claim 1, wherein the enlarged rim is configured to shrink after insertion.

3. The surgical implant assembly of claim 1, wherein the trench supplementing component and the enlarged rim are cross sectionally shaped to lock the enlarged rim in the groove.

4. The surgical implant assembly of claim 1, wherein said anchoring screws or pins are configured for extending through the washer component and into the bone surface.

5. The surgical implant assembly of claim 1, further comprising a flexible elongated reinforcing member embedded in the enlarged rim.