| 摘要 |
A tubular guard 14 encircles the needle 6 and exhibits a conical connection surface which, in the protection position, cooperates with a conical connection surface of the joining piece bearing the needle 6. By pushing on the cap 16 covering the needle 6, the joining piece and the associated guard are secured to the handpiece 1. The collar 17 is then pressed onto the guard 14 and frees the guard from the joining piece. The guard 14 is then hooked onto the handpiece 1 by freeing the end of the needle 6.
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