An inferior vena cava (IVC) implant (20) includes a tubular implant body (40), which is configured such that when implanted in an expanded deployment configuration in the IVC in the vicinity of the renal junctions, (a) has a generally tubular shape (42), (b) has an upstream and downstream ends (44, 46), and (c) is shaped so as to define: (i) two indentations (48) on opposite sides of the tubular implant body (40), which are shaped so as to allow blood flow in the two indentations (48) from upstream (50) of the tubular implant body (40) to downstream (52) of the tubular implant body (40), and (ii) one or more surfaces (54) that at least partially block blood flow through an interior of the tubular implant body (40) from upstream (50) of the tubular implant body to downstream (52) of the tubular implant body (40). Other embodiments are also described.
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