| 摘要 |
An anchoring and expanding unit comprising an anchoring device (20, 20′) and an expanding device (30, 30′), reciprocally removably constrained, the anchoring device (20, 20′) being of the expandable type, wherein the expanding device (30, 30′) includes a series of expanding means (33a, 33b) which can be extracted and blocked in at least two different operative positions, wherein the expanding means (33a, 33b) protrude radially from the expanding device (30, 30′).
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