Joint prosthesis and method of implantation

• US 6,716,249 B2
• Filed: 01/24/2002
• Issued: 04/06/2004
• Est. Priority Date: 01/16/2001
• Status: Expired due to Fees

• Current Assignee: Edward R. Hyde
• Original Assignee: Edward R. Hyde
• Inventors: Hyde, Edward R.
• Primary Examiner(s): Robert, Eduardo C.
• Application Number:
  US10/057,238
• Publication Number:
  US 20020111690A1
• Time in Patent Office: 803 Days
• Field of Search: 623/21.11, 623/21.15, 623/21.16, 623/21.19, 623/908
• US Class Current: 623/21.16
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1617 with mobile or detachable parts
• CPC Class Codes: A61B 17/1637 Hollow drills or saws producing a curved cut, e.g. cylindrical A61B10/025, A61B17/1695 take precedence
• CPC Class Codes: A61B 17/1662 for particular parts of the body
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/1684 for the shoulder
• CPC Class Codes: A61B 17/175 for preparing the femur for hip prosthesis insertion
• CPC Class Codes: A61B 17/1778 for the shoulder
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/38 for elbows or knees
• CPC Class Codes: A61F 2/3804 for elbows
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4014 Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2/4202 for ankles
• CPC Class Codes: A61F 2/4225 for feet, e.g. toes
• CPC Class Codes: A61F 2/4241 for hands, e.g. fingers
• CPC Class Codes: A61F 2/4261 : for wrists
• CPC Class Codes: A61F 2/4612 : of shoulders
• CPC Class Codes: A61F 2002/30079 : magnetic
• CPC Class Codes: A61F 2002/30121 : with lobes
• CPC Class Codes: A61F 2002/30224 : cylindrical
• 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 2002/30387 : Dovetail connection
• CPC Class Codes: A61F 2002/3055 : for adjusting length
• CPC Class Codes: A61F 2002/30599 : stackable
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/3065 : Details of the ball-shaped head
• CPC Class Codes: A61F 2002/30677 : Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30685 : Means for reducing or preventing the generation of wear particulates
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3082 : Grooves
• CPC Class Codes: A61F 2002/3085 : with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2002/30873 : Threadings machined on non-cylindrical external surfaces
• 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 2002/30934 : Special articulating surfaces
• CPC Class Codes: A61F 2002/3414 : Polar protrusion, e.g. for centering two concentric shells
• CPC Class Codes: A61F 2002/3448 : Multiple cups made of three or more concentric shells fitted or nested into one another
• CPC Class Codes: A61F 2002/3611 : Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2002/3625 : Necks
• CPC Class Codes: A61F 2002/365 : Connections of heads to necks
• CPC Class Codes: A61F 2002/4018 : Heads or epiphyseal parts of humerus
• CPC Class Codes: A61F 2002/4635 : using minimally invasive surgery
• CPC Class Codes: A61F 2002/4687 : Mechanical guides for implantation instruments
• CPC Class Codes: A61F 2210/009 : magnetic
• 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 2230/0006 : circular
• CPC Class Codes: A61F 2230/0069 : cylindrical
• CPC Class Codes: A61F 2230/0093 : Umbrella-shaped, e.g. mushroom-shaped
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

The present invention relates to a modular prosthetic joints in general and in particular to a finger or toe joint assembly and method for implanting this assembly using a transosseous core approach. An exemplary modular finger joint implant and method are provided wherein individual modules can be passed through a relatively small bone hole and implanted without cutting the collateral ligaments connecting two adjacent finger bones.

Claims

1. A modular, prosthetic finger or toe joint assembly adapted to be inserted through a bone hole, wherein said bone hole extends from a first bone through an articular surface of the first bone and through an articular surface of a second bone, said assembly comprising:

an articular head module, having a substantially convex articular surface and configured for attachment to the first bone through said bone hole;

an articular base module, having a substantially concave articular surface for mating with said convex articular surface, said base module being configured and dimensioned to be inserted through said bone hole and attached to the second bone

a first magnetic array placed in the convex articular surface; and

a second magnetic array placed in the concave articular surface,

wherein said first and second arrays are configured to provide a magnetic field ineraction to align the two articular surfaces.

2. The prosthetic assembly of claim 1 further comprising an intramedullary rod securable to the head module and configured and dimensioned for insertion into a first bone intramedullary canal.

3. The prosthetic assembly of claim 1 further comprising an intramedullary rod securable to the base module and configured and dimensioned for insertion into a second bone intramedullary canal.

4. The prosthetic assembly of claim 1, wherein said convex articular surface is defined substantially by a portion of the surface of a sphere.

5. The prosthetic finger joint assembly of claim 1, wherein said concave articular surface is defined substantially by a portion of the surface of an ellipsoid.

6. The prosthetic assembly of claim 1, wherein said first and said second magnetic arrays are configured such that at least one said array provides a composite magnetic field.

7. The prosthetic assembly of claim 6, wherein one said magnetic array comprises a plurality of magnets around the periphery of either said convex or concave articular surface.

8. The prosthetic assembly of claim 6, wherein one said magnetic array comprises a unitary annular magnet disposed on either the convex or concave articular surface.

9. A transosseous core method for implanting a finger joint prosthesis comprising:

forming a hole through the articular head of a first finger bone transverse to the length of the first bone and through the articular surface of a second finger bone to expose the intramedullary canal of the second bone and expose the intramedullary canal of the first bone;

removing a portion of the articular surface of the first bone;

inserting a first rod through the first bone hole and into the first bone intramedullary canal;

inserting a second rod through the first bone hole and into the second bone intramedullary canal;

attaching a base articular module onto the end of the second rod module; and

attaching an articular head module onto the end of the first rod module to engage the two articular surfaces.

10. The method of claim 9, wherein said base articular surface is concave and is substantially a portion of the surface of an ellipsoid.

11. The method of claim 9, further comprising:

placing a first magnetic array in the articular surface of the head module; and

placing a second magnetic array in the articular surface of the base module,

wherein said first and second arrays are configured to provide a magnetic field interaction to align the two articular surfaces.

12. The method of claim 11, wherein said first and second magnetic arrays are configured such that at least one magnetic array provides a composite magnetic field.

13. The method of claim 9, wherein the step of removing a portion of the articular surface of the first bone forms a substantially U-shaped configuration in the head of the first bone where an articular head module may be seated.

14. A transosseous core method for implanting a finger joint prosthesis comprising:

forming a hole in the articular head of a first finger bone transverse to the length of the bone and further through an articular surface of a second, cooperating finger bone;

removing a portion of the articular head of the first bone;

implanting a base articular module onto the end of the second bone, said base module having a concave articular surface; and

implanting an articular head module onto the end of the first bone, said head module having a convex articular surface,

wherein said base and head modules are configured and disposed to engage their articular surfaces.

15. The method of claim 14, further comprising first inserting at least one intramedullary rod of the bone hole into one of said bones and securing the associated module thereon.

16. The method of claim 14, further comprising:

placing a first magnetic array in the convex articular surface; and

placing a second magnetic array in the concave articular surface,

wherein said first and second arrays are configured to provide magnetic field interaction acting to maintain the articular surfaces in alignment with each other.

17. The method of claim 16, wherein said first and said second magnetic arrays are configured such that at least one array provides a composite magnetic field.

18. The method of claim 14, wherein the step of removing a portion of the articular surface of the first bone forms a U-shaped configuration in the head of the first bone where an articular head module may be seated.