Tissue scaffold anchor for cartilage repair

• US 6,743,232 B2
• Filed: 02/26/2001
• Issued: 06/01/2004
• Est. Priority Date: 02/26/2001
• Status: Expired due to Term

• Current Assignee: Ethicon Incorporated (Johnson & Johnson)
• Original Assignee: Ethicon Incorporated (Johnson & Johnson)
• Inventors: Contiliano, Joseph H., Overaker, David W.
• Primary Examiner(s): Bennett, Henry
• Assistant Examiner(s): Dagostino, Sabrina
• Application Number:
  US09/793,693
• Publication Number:
  US 20020120274A1
• Time in Patent Office: 1,191 Days
• Field of Search: A61/B 1.756, 606/72, 606/151, 606/53, 606/232, 623/16, 623/18
• US Class Current: 623/13.14
• CPC Class Codes: A61B 17/0642 for bones, e.g. for osteosynthesis or connecting tendon to bone
• CPC Class Codes: A61B 17/0643 with separate closing member, e.g. for interlocking with staple
• CPC Class Codes: A61B 2017/00004 (bio)absorbable, (bio)resorbable, resorptive for implantable prostheses A61F2210/0004
• CPC Class Codes: A61B 2017/0646 for insertion into cartillege, e.g. meniscus
• CPC Class Codes: A61B 2017/0647 having one single leg, e.g. tacks
• CPC Class Codes: A61F 2/30749 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30233 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30354 Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30751 for attaching cartilage scaffolds to underlying bone
• CPC Class Codes: A61F 2002/30766 : Scaffolds for cartilage ingrowth and regeneration
• CPC Class Codes: A61F 2002/30772 : Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30845 : with cutting edges
• 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 2002/30879 : Ribs
• CPC Class Codes: A61F 2002/30891 : Plurality of protrusions
• CPC Class Codes: A61F 2002/4677 : using a guide wire
• CPC Class Codes: A61F 2210/0004 : bioabsorbable
• 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 2230/0023 : triangular
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2250/0036 : differing in thickness
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00221 : containing calcia or calcium oxide
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite
• CPC Class Codes: A61F 2310/00329 : Glasses, e.g. bioglass
• CPC Class Codes: Y10S 606/908 : Bioabsorbable material
• CPC Class Codes: Y10S 606/909 : Bone

Abstract

A device for attaching a tissue replacement scaffold to a bone has a platform positionable in substantially parallel relationship to the bone for retaining the tissue scaffold proximate to the bone. A post extends from the platform and is insertable into a hole formed in the bone. One or more ribs extend from a side surface of the post along a portion of its length. The ribs have an increasing cross-sectional area to establish an increasing interference fit relative to the hole in the bone tissue. The ribs have a sharp edge that grips the sides of the hole in the bone such that the ribs restrict rotation or withdrawal of the device.

Claims

1. A device for attaching a tissue scaffold to bone tissue, comprising:

a platform positionable in substantially parallel relationship to the bone tissue for retaining the tissue scaffold proximate to the bone tissue;

a post extending from the platform, said post being insertable into a hole formed in the bone tissue; and

at least one rib extending from a surface of said post along a portion of the length of said post from a first point distal to said platform to a second point intermediate said first point and said platform, said at least one rib having a cross-sectional area that increases along the length of said rib in the direction from said first point to said second point, said at least one rib establishing an interference fit relative to the hole in the bone tissue to prevent rotation of said device relative to the bone tissue, said at least one rib being shorter in length than the depth of the hole in the bone tissue and having a diverging surface which expands in width in the direction from said first point to said second point and which diverges from the surface of said post in the direction from said first point to said second point, and said at least one rib terminating proximate said second point in a sharp edge which is positionable within said hole for gripping the bone tissue to resist withdrawal of said device from the hole.

2. The device of claim 1, wherein said at least one rib has a shape approximating a portion of an elongated cone.

3. The device of claim 2, wherein said at least one rib is a plurality of ribs disposed about the outer peripheral surface of said post.

4. The device of claim 3, wherein said post has a chamfered end to aid in the introduction of said post into the hole in the bone tissue.

5. The device of claim 4, wherein said device has a guide wire hole extending axially there through to permit said device to be slipped over a guide wire having one end thereof positioned in the hole for guiding said device into the hole.

6. The device of claim 1, wherein said post extends from said platform at about 90 degrees.

7. The device of claim 1, wherein said platform has a perforation therein to allow fluid and cell transmission through said perforation.

8. The device of claim 1, wherein said device is formed from a material selected from the group consisting of biocompatible polymers, absorbable polymers, glasses, ceramics, metal oxides, bone tissue and therapeutic agents, alone or in combination.

9. A device for attaching a tissue scaffold to bone tissue, comprising:

a platform positionable in substantially parallel relationship to the bone tissue for retaining the tissue scaffold proximate to the bone tissue;

a post extending from the platform and being monolithically formed therewith, said post insertable into a hole formed in the bone tissue;

at least one rib extending from a surface of said post along a portion of the length of said post from a first point distal to said platform to a second point intermediate said first point and said platform, said at least one rib having a cross-section area that increases along the length of said rib in the direction from said first point to said second point, said at least one rib establishing an interference fit relative to the hole in the bone tissue to prevent rotation of said device relative to the bone tissue.

10. A device for attaching a tissue scaffold to bone tissue, comprising:

a platform positionable in substantially parallel relationship to the bone tissue for retaining the tissue scaffold proximate to the bone tissue;

a post extending from the platform, said post being insertable into a hole formed in the bone tissue and being formed independently of said platform; and

at least one rib extending from a surface of said post along a portion of the length of said post from a first point distal to said platform to a second point intermediate said first point and said platform, said at least one rib having a cross-section area that increases along the length of said rib in the direction from said first point to said second point, said at least one rib establishing an interference fit relative to the hole in the bone tissue to prevent rotation of said device relative to the bone tissue.

11. The device of claim 10, wherein said platform has a coupling pin extending from a surface thereof, said post having a hollow therein for matingly receiving said coupling pin to couple said platform and said post.

12. The device of claim 11, further including a latch resiliently mounted on said coupling pin, said latch having a locking position and a withdrawn position, said latch permitting said coupling pin to be inserted into said hollow in said post in a coupling relationship with said post when in said withdrawn position and retaining said coupling pin coupled to said post in said locking position.

13. A device for attaching a tissue scaffold to bone tissue, comprising:

attaching means for attaching the scaffold to said device; and

retaining means coupled to said attaching means being for retaining said attaching means in proximity to the bone tissue, said retaining means being insertable into a hole formed in the bone tissue and including gripping means extending from the outer periphery thereof for gripping the bone tissue proximate the hole to restrain said device from rotating or pulling away from the bone tissue, said gripping means having an outer surface diverging from said retaining means and expanding in surface area in the direction proximal to said attaching means.

14. The device of claim 13, wherein said gripping means have a gradually increasing interference fit relative to the hole in the bone tissue.

15. The device of claim 14, wherein said gripping means are fully insertable within the hole in the bone tissue and have a sharp edge which gouges into the bone tissue proximate the hole.

16. The device of claim 15, wherein said attaching means has apertures therein for allowing the flow of fluids and cells there through.

17. The device of claim 16, further including coupling means for coupling said attaching means and said retaining means.

18. The device of claim 16, wherein said attaching means and said retaining means are formed from a composition with a porosity permitting ingrowth of cells.