| 摘要 |
PCT No. PCT/EP93/00792 Sec. 371 Date Dec. 1, 1993 Sec. 102(e) Date Dec. 1, 1993 PCT Filed Mar. 31, 1993 PCT Pub. No. WO93/19790 PCT Pub. Date Oct. 14, 1993.A cannula comprising a tubular element with two longitudinal slots lying in a diametral plane and defining two blades joined at the ends thereof by a block of material. A plunger with a tapering tip is linked to a contol rod and a grip and extends through a passage and into a channel in the tubular element, which channel ends behind the free ends of the blades. When the plunger is driven towards the free end of the tubular element, its conical portion reached the end of the channel and pushes the blades apart laterally so that the block of material breaks and allows said blades to spread apart.
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