Endonasal sinus surgery was in progress when the high speed tapered diamond, 4mm 70 degree, burr's tip (ref# (b)(4)/lot#0209598413) was noted to be missing.No patient/staff harm.Additional burrs obtained for procedure to continue.Two more endonasal drill attachments from the same manufacturer/company broke during the case: first, ref#(b)(4)/ lot#0209504794 - high speed round diamond burr, 5mm 15 degree, burr's 䓠neck broke and the tip popped out while in use.Second, ref#(b)(4)/ lot#0209237919 - high speed tapered diamond burr 4mm 70 degree, burr broke.
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