Method and apparatus for machining a surgical implant

• US 20050244239A1
• Filed: 05/30/2003
• Published: 11/03/2005
• Est. Priority Date: 05/30/2002
• Status: Abandoned Application

• Current Assignee: Osteotech Incorporated (Medtronic Plc)
• Original Assignee: Osteotech Incorporated (Medtronic Plc)
• Inventors: Shimp, Lawrence A.
• Application Number:
  US10/516,159
• Publication Number:
  US 20050244239A1
• Time in Patent Office: Days
• US Class Current: 409/132
• CPC Class Codes: A61F 2/4644 Preparation of bone graft, bone plugs or bone dowels, e.g. grinding or milling bone material bone material A61F2/28; disintegrating or milling devices B02C
• 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 2002/2839 Bone plugs or bone graft dowels
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30158 trapezoidal
• CPC Class Codes: A61F 2002/30281 wedge-shaped
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2230/0019 rectangular
• CPC Class Codes: A61F 2230/0026 trapezoidal
• CPC Class Codes: A61F 2230/0086 Pyramidal, tetrahedral, or wedge-shaped
• CPC Class Codes: B23C 2210/088 Cutting edges with a wave form
• CPC Class Codes: B23C 2260/80 Serrations
• CPC Class Codes: B23C 3/28 Grooving workpieces tread-cutting by milling B23G1/32
• CPC Class Codes: Y10T 409/303808 including infeeding

Abstract

A method is provided for machining a customized surgical implant in the operating room provided. Apparatus and a kit for carrying out the method are also provided.

Claims

1. A method for machining a surgical implant which comprises:

a) providing a bone blank having an instrument face;

b) positioning the bone blank in a clamping device, the clamping device including a jig having a bone-supporting surface for supporting the bone blank, and the clamping device further including an abutment surface, wherein the bone blank is mounted on the bone-supporting surface of the jig and the instrument face of the bone blank is positioned in contact with the abutment surface of the clamping device;

c) relatively moving a first load bearing surface of the bone blank and a machine tool into machining contact with each other; and

d) matching at least a portion of the first load bearing surface of the bone blank.

2. The method of claim 1 wherein the bone blank is repositioned in the clamping device after machining step (d) to present a second load bearing surface of the bone blank, at least a portion of the second load bearing surface of the bone blank thereafter being machined.

3. The method of claim 1 wherein milling the load bearing surface of the bone blank produces serrations or protrusions thereon.

4. The method of claim 1 wherein the angle of the jig with respect to the machine tool is adjustable.

8. The method of claim 1 wherein the angle of the jig with respect to the machine tool is adjustable.

14. The kit of claim 1 wherein the jig is made of material that cannot be sterilized by heat or autoclaving.

21. The method of claim 2 wherein milling the load bearing surface of the bone blank produces serrations thereon.

5. A method for machining a surgical implant which comprises:

a) providing a bone blank having an instrument face with a first keying element configured and dimensioned to engage a second keying element;

b) positioning the bone blank in a clamping device, the clamping device including a jig having a bone-supporting surface for supporting the bone blank, and the clamping device further including an abutment surface having a second keying element configured and dimensioned to engage the first keying element of the bone blank, wherein the bone blank is mounted on the bone-supporting surface of the jig and the instrument face of the bone blank is positioned in contact with the abutment surface of the clamping device;

c) relatively moving a first load bearing surface of the bone blank and a machine tool into machining contact with each other; and

d) machining at least a portion of a first load bearing surface of the bone blank.

6. The method of claim 5 wherein the bone blank is repositioned in the clamping device after machining step (d) to present a second load bearing surface of the bone blank, at least a portion of the second load bearing surface thereafter being machined.

7. The method of claim 5 wherein machining of a load bearing surface of the bone blank produces serrations or protrusions thereon.

9. A machining apparatus for machining a surgical implant comprising a clamping device for receiving a jig and a bone blank possessing a first keying element, the clamping device having an abutment surface with a second keying element configured and dimensioned to engage the first keying element of the bone blank.

10. The machining apparatus of claim 9 wherein the machining apparatus includes a cutting tool.

11. The machining apparatus of claim 10 wherein the cutting tool is a rotatable milling bit.

12. The machining apparatus of claim 9 wherein the machining apparatus further includes means for relatively moving the bones blank and the cutting tool into machining contact with each other.

13. A surgical kit comprising:

a) at least one bone blank for implantation into a body, the bone blank having an instrument face with a first keying element; and

b) at least one jig, the jig having a bone blank support surface with a variable angulation surface or a predetermined angle of inclination, said jig being individually receivable into a clamping device.

15. The kit of claim 13 further including a machining apparatus.

16. The kit of claim 15 wherein the machining apparatus includes a clamping device for receiving the jig and bone blank, the clamping device having an abutment surface with a second keying element configured and dimensioned to engage the first keying element of the bone blank.

17. The kit of claim 16 wherein the machining apparatus includes a cutting tool.

18. The kit of claim 17 wherein the cutting tool is a rotatable milling bit.

19. The kit of claim 16 wherein the machining apparatus further includes means for relatively moving the bone blank and the cutting tool into machining contact with each other.

20. The kit of claim 13 wherein the bone blank comprises monolithic bone.