Implantable orthopedic prosthesis having tissue attachment surface and method of manufacture

• US 6,127,596 A
• Filed: 01/23/1998
• Issued: 10/03/2000
• Est. Priority Date: 01/23/1998
• Status: Expired due to Term

• Current Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Sulzer Orthopedics Inc. (Centerpulse Orthopedics Incorporated)
• Inventors: Burrows, James, Wheeler, John, Brown, Steve, Lester, Mark
• Primary Examiner(s): Hirsch, Paul J.
• Assistant Examiner(s): Priddy, Michael B.
• Application Number:
  US09/012,199
• Time in Patent Office: 984 Days
• Field of Search: 623/16, 623/22, 623/18, 606/61, 606/69, 606/70
• US Class Current: 623/16.11
• CPC Class Codes: A61B 17/06166 Sutures suture materials A61L17/00; manufacture of artificial threads D01D; treatment of threads D06M
• CPC Class Codes: A61B 17/809 with bone-penetrating elements, e.g. blades or prongs bone staples A61B17/0642; intramedullary nails with a plate at an end A61B17/7233
• CPC Class Codes: A61B 17/82 for bone cerclage apparatus for manipulating wires or straps A61B17/8861; wires, bands or straps other than cerclage A61B17/842
• CPC Class Codes: A61B 17/842 Flexible wires, bands or straps A61B17/72, A61B17/82, A61B17/86 take precedence
• CPC Class Codes: A61F 2/0811 Fixation devices for tendons or ligaments
• CPC Class Codes: A61F 2/30739 Devices connected to the proximal part of an endoprosthetic femoral shaft for reinforcing or replacing the trochanters, e.g. the greater trochanter proximal parts of endoprosthetic femoral shafts A61F2/367; non-prosthetic trochanteric devices A61B17/74
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/3607 including proximal or total replacement of the femur
• CPC Class Codes: A61F 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• 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 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30143 hexagonal
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• 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 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30433 : using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30604 : modular
• CPC Class Codes: A61F 2002/30784 : Plurality of holes
• CPC Class Codes: A61F 2002/30795 : Blind bores, e.g. of circular cross-section
• CPC Class Codes: A61F 2002/30797 : internally-threaded
• CPC Class Codes: A61F 2002/30808 : parallel
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30957 : using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/30978 : using electrical discharge machining [EDM]
• CPC Class Codes: A61F 2002/3625 : Necks
• CPC Class Codes: A61F 2002/365 : Connections of heads to necks
• CPC Class Codes: A61F 2002/3674 : Connections of proximal parts to distal parts
• CPC Class Codes: A61F 2002/368 : with lateral apertures, bores, holes or openings, e.g. for reducing the mass, for receiving fixation screws or for communicating with the inside of a hollow shaft
• CPC Class Codes: A61F 2002/4638 : Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor
• 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 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2250/0026 : differing in surface structures
• CPC Class Codes: B23H 1/04 : Electrodes specially adapted therefor or their manufacture B23H9/00 takes precedence
• CPC Class Codes: B23H 9/008 : Surface roughening or texturing

Abstract

An implantable orthopedic prosthesis has a macro/micro-textured bone and soft tissue attachment surface to which a spiked washer is clamped by a threaded bolt received through said washer and threaded into said prosthesis. Soft tissue is secured to the prosthesis by clamping between said washer and said soft tissue attachment surface. The tissue attachment surface is arranged as a regular grid of depressions separated by orthogonal ridges formed by electrodischarge machining of the prosthesis using a machining electrode having a mold-opposite surface texture with a micro-textured roughened surface finish. The spacing of the spikes is and integer multiple of the spacing of the depressions to assure registry of the spikes with the depressions.

Claims

1. An implantable orthopedic femoral prosthesis for replacing a proximal femur and connecting to soft tissue of a patient, comprising:

an implantable orthopedic prosthetic body having a distal shank portion, a medial neck portion, and a proximal trochanter portion having a macro-textured tissue attachment surface thereon;

a washer having spikes adapted to clamp the soft tissue against said macro-textured tissue-attachment surface; and

means for retaining said washer in engagement with said implantable prosthetic body such that said spikes engage said macro-textured tissue attachment surface under pressure;

said macro-textured tissue-attachment surface having a regular pattern of texture and said washer having said spikes arrayed in a similarly regular pattern such that registry of said spikes with said textured surface is assured.

2. The prosthesis of claim 1, in which said regular pattern of texture comprises a substantially regular grid.

3. The prosthesis of claim 2, in which said regular grid has depressions spaced at regular intervals.

4. The prosthesis of claim 3, in which said spikes are spaced at intervals that are integer multiples of the regular intervals at which said depressions are spaced.

5. The prosthesis of claim 1 in which the spikes have an elongated conical configuration.

6. The prosthesis of claim 1 in which the macro-textured tissue attachment surface has depressions with a maximum depth of about 0.030 inches.

7. A method for attaching soft tissue of a patient to an implantable orthopedic femoral prosthesis, comprising the steps of:

providing an implantable orthopedic femoral prosthesis having a body with a distal shank portion, a medial neck portion, and a proximal trochanter portion having a macro-textured tissue attachment surface with a pattern of texture;

providing a washer having a plurality of projections with a pattern of texture similar to the pattern of texture of the macro-textured tissue attachment surface;

implanting the orthopedic femoral prosthesis at the proximal end of the femur of the patient;

positioning the soft tissue of the patient between the projections and the macro-textured tissue attachment surface of the trochanter portion; and

tightening the washer against the trochanter portion to clamp the soft tissue between the projections and the macro-textured tissue attachment surface.

8. The method of claim 7 further comprising the step of maintaining the washer against the trochanter portion while the soft tissue grows into the macro-textured tissue attachment surface.