| 摘要 |
An internal fixation pin comprises first and second portions with threads of different diameters, but having the same pitch and thread depth. The first portion includes a self-tapping tip. The opposite end is headless. A non-threaded shaft portion is frangibly connected to the second portion and is a mechanism for rotating the pin for threaded insertion into bone. A plurality of circumferentially spaced-apart longitudinal grooves are provided on the second portion adjacent its intersection with the shaft portion. The pin may be solid or cannulated. After insertion of the first and second portions across a fracture, the shaft portion is removed. The grooves permit engagement by a tool for rotation of the pin for removal should removal be necessary.
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