| http://www.w3.org/ns/prov#value | - In order to avoid damage to the wall of the vena cava by the spring release operation of the centering legs, a small slide member having, e.g. a spherical or similar smoothly rounded surface may be provided at the free end of each centering leg 19, whereby the centering legs 19 may be safely retracted into the external guide sheath once the implantation process is completed.
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