Method for determining a tooth period length of a bone milling cutter

• US 20080077148A1
• Filed: 09/11/2007
• Published: 03/27/2008
• Est. Priority Date: 09/27/2006
• Status: Active Grant

• Current Assignee: Joimax GmbH
• Original Assignee: Joimax GmbH
• Inventors: Notheis, Mathias, Ries, Wolfgang
• Granted Patent: US 8,267,937 B2
• Time in Patent Office: Days
• US Class Current: 606/80
• 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 17/1671 for the spine
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 17/32053 Punch like cutting instruments, e.g. using a cylindrical or oval knife A61B17/326 takes precedence; trepans A61B17/1695; for use on the cornea A61F9/007
• CPC Class Codes: A61B 17/3472 for bones, e.g. intraosseus injections
• CPC Class Codes: A61B 2017/00261 Discectomy
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing
• CPC Class Codes: A61B 2090/08021 of the patient or his organs
• CPC Class Codes: Y10T 409/30 Milling

Abstract

A method for manufacturing bone milling cutters, wherein a milling cutter toothing (12) is created at a distal face of a tubular milling cutter shaft (10) of a bone milling cutter at a given outer diameter (D) of the milling cutter shaft (10). The following steps are carried out: determining the tube circumference (U) of the milling cutter shaft (10); ascertaining an average desired tooth height (Hgew) of the milling cutter toothing (12); ascertaining the desired tooth period length (LZ′) of the milling cutter toothing from the desired tooth height (Hgew) at given parameters of a tooth period pattern; dividing the tube circumference (U) by the desired tooth period length (LZ); rounding the results to an even number value (Qz); and dividing the tube circumference (U) by the value (Qz) in order to obtain the tooth period length (LZ).

Claims

1. A method for manufacturing a bone milling cutter, wherein a milling cutter toothing is created at a distal face of a tubular milling cutter shaft of a bone milling cutter and at a given outer diameter of a milling cutter shaft, the method comprising the following steps, executed in sequence:

a) determining a tube circumference of the milling cutter shaft;

b) ascertaining an average desired tooth height of the milling cutter toothing;

c) ascertaining a desired tooth period length of the milling cutter toothing from the desired tooth height at given parameters for a tooth period pattern;

d) dividing the tube circumference by the desired tooth period length and rounding the results to an even number value;

e) dividing the tube circumference by the even number value to obtain an actual tooth period length; and

f) mechanically removing or severing material at the distal end of the milling cutter shaft to configure previously determined milling cutter toothing.

2. The method of claim 1, wherein the tube circumference is determined by an outer diameter.

3. The method of claim 1, wherein the toothing is configured at a distal tube end by mechanically removing or severing material.

4. The method of claim 1, wherein the toothing is created by means of laser welding.

5. The method of claim 1, wherein the toothing is created by grinding.

6. The method of claim 1, wherein the toothing is created by milling.

7. The method of claim 1, wherein the toothing is created by etching.

8. The method of claim 1, wherein the parameters for the tooth period pattern comprise at least one wedge angle (a).

9. The method of claim 1, wherein the parameters for the tooth period pattern comprise at least one angle of incidence (c).

10. The method of claim 1, wherein the tooth period pattern contains at least one pair of teeth.

11. The method of claim 10, wherein a fraction of the tooth period length is formed to determine a length of at least one tooth of the tooth period pattern.

12. The method of claim 10, wherein a fraction of the tooth height is formed to determine a height of at least one tooth of the tooth period pattern.

13. The method of claim 10, wherein a height of at least one larger and one smaller tooth of the tooth period pattern is determined.

14. The method of claim 13, wherein a height of a larger tooth and a height of a smaller tooth are determined starting from a common tooth tip line.

15. The method of claim 10, wherein a length of at least one larger and one smaller tooth of the tooth period pattern is determined.

16. The method of claim 15, wherein, when ascertaining the desired tooth period length from the desired tooth height of the milling cutter toothing, a length of a larger tooth of the tooth period pattern is determined such that it is ⅔

of a tooth height and a length of a smaller tooth of the tooth period pattern is determined such that it is ⅓

of a tooth height, wherein the tooth period length corresponds to a sum of lengths of the teeth.

17. The method of claim 13, wherein a height of a larger tooth and a height of a smaller tooth are determined starting from a common tooth base line.

18. The method of claim 13, wherein, when ascertaining the desired tooth period length from the tooth height of the milling cutter toothing, a length of a larger tooth of the tooth period pattern is determined such that it is ⅗

of the desired tooth height and a length of a smaller tooth of the tooth period pattern is determined such that it is ⅖

of the tooth height, wherein the tooth period length corresponds to a sum of the lengths of the teeth.

19. A device for manufacturing a bone milling cutter, wherein a milling cutter toothing is created at a distal face of a tubular milling cutter shaft of a bone milling cutter and at a given outer diameter of a milling cutter shaft, the device comprising:

means for determining a tube circumference of the milling cutter shaft;

means for ascertaining an average desired tooth height of the milling cutter toothing;

means for ascertaining a desired tooth period length of the milling cutter toothing from the desired tooth height at given parameters for a tooth period pattern;

means for dividing the tube circumference by the desired tooth period length and rounding the results to an even number value; and

means for dividing the tube circumference by the even number value to obtain an actual tooth period length.

20. The device of claim 19, wherein the parameters for the tooth period pattern comprise at least one wedge angle and/or one angle of incidence.

21. A bone milling cutter having a tubular milling cutter shaft and a milling cutter toothing at a distal face of the tubular milling cutter shaft, wherein the milling cutter toothing is formed from a number of tooth period patterns periodically distributed over at least a part of a tube circumference of the milling cutter shaft.

22. The bone milling cutter of claim 21, whose toothing is determined by the following steps:

determining a tube circumference of the milling cutter shaft;

ascertaining an average desired tooth height of the milling cutter;

ascertaining a desired tooth period length of the milling cutter toothing from the desired tooth height at given parameters of a tooth period pattern;

dividing the tube circumference by the desired tooth period length and rounding results to an even number value; and

dividing the tube circumference by the even number value to obtain an actual tooth period length.