Influence of tool geometry on drilling performance of cortical and trabecular bone

G.J.M. Tuijthof*, C. Frühwirt, C. Kment

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

41 Citations (Scopus)

Abstract

Minimally invasive surgery poses high demands on tool design. The goal was to measure the influence of drill bit geometry on maximum thrust forces required for drilling, and compare this relative to the known influence of feed rate and bone composition.Blind holes were drilled perpendicular to the iliac crest up to 10. mm depth in cadaveric pelvic bones of 20 pigs (adolescent) and 11 goats (full grown) with eight substantially different drill bits of ∅ 3-3.2. mm. Subsequently, boreholes were drilled perpendicular to the ilium with the same drill bits at three different feed rates (0.58. mm/s, 0.83. mm/s, 1.08. mm/s). The mean maximum thrust force ranges from 10 to 110. N for cortical bone, and from 3 to 65. N for trabecular bone. The results show that both drill bit geometry and feed rate have a significant influence on the maximum thrust forces, with a dominant influence of drill bit geometry in terms of shape of the flutes, sharpness of cutting edges and value of point angle. The differences in thrust forces between cortical and trabecular bone are substantial for all measured conditions. The measured values can be used for drill design.

Original languageEnglish
Pages (from-to)1165-1172
Number of pages8
JournalMedical Engineering and Physics
Volume35
Issue number8
Early online date6 Jan 2013
DOIs
Publication statusPublished - Aug 2013
Externally publishedYes

Keywords

  • Animal
  • Bone
  • Drill
  • Force
  • Iliac crest
  • Tool geometry

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