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Surgical bur with Anti-chatter flute geometry

a technology of flute geometry and surgical burs, which is applied in the field of surgical burs, can solve the problems of increased spatial gap between any two flutes and in-place tissue, burs that are prone to vibration, and burs that are subject to forced vibration, and achieve the effect of reducing, if not eliminating, chatter

Inactive Publication Date: 2008-06-05
STRYKER EURO OPERATIONS HLDG LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new surgical bur that reduces chatter during use. The bur has cutting edges and multiple sets of flutes. The flutes have cutting edges that emerge from the bur head at different positions. In some versions, the distal ends of the flutes are chamfered, and the cutting edges start at positions proximal to the distal ends. The bur head is also formed so that the second set of flutes emerges from the bur head at locations proximal to the locations from which the first set emerges. Overall, this design improves the performance of the surgical bur.

Problems solved by technology

Nevertheless, a problem associated with some burs is chatter.
Over time, the repetitive exposure of the bur flutes to these variable forces causes the bur to undergo forced vibration.
However, if the bur head is pressed against the tissue to make a deep cut, the time in which the spatial gap between any two flutes is located against the in-place tissue increases.
Consequently, there may not be enough time for tissue entrained in this gap to be discharged.
These gaps between the flutes clog.
It is believed that that build up of chips between the flutes and their cutting edges clogs the bur head.
This clogging, in turn, it is believed causes a forced vibration and the resultant chatter.

Method used

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  • Surgical bur with Anti-chatter flute geometry
  • Surgical bur with Anti-chatter flute geometry
  • Surgical bur with Anti-chatter flute geometry

Examples

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Embodiment Construction

[0038]FIG. 1 illustrates a surgical bur 20 constructed in accordance with this invention. Bur 20 has a head 22 that forms the distal end of the bur. (“Distal” it shall be understood, means towards the surgical site to which the bur is applied. “Proximal” means away from the surgical site.) Bur head 22 has a distal end tip 23 that is the most forward portion of the bur 20. A shaft 24 extends proximally rearward from the bur head 22.

[0039]The proximal end of the shaft 24 is provided with coupling features 26. The coupling features 26 are geometric features that facilitate the removable engagement of the shaft 24 to a coupling assembly integral with the rotating shaft of a powered surgical tool with which bur 20 is used (tool not illustrated.) The illustrated coupling features 26 are a set of planar faces recessed relative to the outer diameter of the shaft 24. One such geometry is described and illustrated in U.S. Pat. No. 5,888,200, issued 30 Mar. 1999, Multi-Purpose Surgical Tool Sy...

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Abstract

A surgical bur (20) including a shaft with a bur head. A number of flutes are formed on the bur head. Each flute has a cutting edge (54). The flutes are formed so that some of the flutes having cutting edges emerge from the bur head at locations relatively close to the distal end tip of the head. Still other flutes are formed so as to have cutting edges that start, extend proximally rearward, from locations that are, spaced proximal from the distal end tip.

Description

RELATIONSHIP TO EARLIER FILED APPLICATION[0001]This application is a continuation of PCT App. No. PCT / IB2006 / 002118, filed 17 Jul. 2006 which claims priority from U.S. Pat. App. No. 60 / 700,384 filed 19 Jul. 2005. This application also claims priority from U.S. Pat. App. No. 60 / 866,735 filed 21 Nov. 2006.BACKGROUND OF THE INVENTION[0002]This invention is generally related to surgical burs. More particularly, this invention is related to a surgical bur with a bur head geometry that substantially reduces chatter when the bur is applied to a surgical site.BACKGROUND OF THE INVENTION[0003]A tool used to perform a surgical procedure is the bur. A bur generally consists of a head formed from rigid material, typically metal, shaped to have a number of flutes. The flutes are formed to define tissue cutting edges. A shaft extends rearwardly from the head. The free end of the shaft has a feature that facilitates locking the shaft to a powered handpiece. The actuation of the handpiece results i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B17/32
CPCA61B17/1615A61B17/32002A61B17/1673
Inventor O'SULLIVAN, DENIS F.O'DONOGHUE, DENIS
Owner STRYKER EURO OPERATIONS HLDG LLC
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