Conical Extraction Bolt
Also called Conical extraction screw, Extraction screw, Extraction bolt
- Type
- Specialty
Hardened extraction screw with a conical, left-handed (reverse) thread at the tip. It fits on a T-handle (or handle/cross-handle); AO's broken-screw set has two sizes.
Primary uses
What this instrument is on the table to do.
Hardware removal. For a screw with a stripped recess it is pressed into the recess and turned counterclockwise until the conical thread bites and the screw backs out. For a broken screw shaft, after a countersink and hollow reamer have freed the shaft, the right-size extraction bolt is turned counterclockwise onto it to pull it out. Also used when a shallow shaft cannot be gripped with pliers.
Sizes & variants
The lengths, angles and patterns it comes in.
AO set: two sizes on a T-handle. DePuy Synthes OPERACE extraction screws: 1.6, 2.0, 2.6 and 3.5 mm, matched to the screw recess size (Table 2), used on a handle or cross-handle; sterile, single-use, stainless steel with a silicon carbide coating.
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