| 摘要 |
A self-drilling anchor (10) for use in a friable material or a semi-rigid material comprises a body (12) having an axis (6), an axial bore (8) adapted to receive a fastener, a proximal end, a drilling end, a proximal portion adjacent the proxi-mal end having high threading having a crest diam-eter for engaging the friable or semi-rigid material, and a drilling portion (16) adjacent the drilling end, an additional thread proximate the proximal end, the additional thread continuing between turns of the high threading, and a head at the proximal end having an outer diameter that is smaller than the crest diameter The anchor additional thread is con-figured to engage either the friable material or, addi-tionally, to firmly engage the semi-rigid material
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