VASCULAR IMPLANT
A medical implant ( 20 ) includes first and second ring members ( 22, 24 ), each including a resilient framework ( 26 ) having a generally cylindrical form. A tubular sleeve ( 28 ) is fixed to the first and second ring members so as to hold the ring members in mutual longitudinal alignment, thereby defining a lumen ( 32 ) passing through the ring members. A constricting element ( 30 ) is fit around the sleeve at a location intermediate the first and second ring members so as to reduce a diameter of the lumen at the location.
1 . A medical implant, comprising:
first and second ring members, each including a resilient framework having a generally cylindrical form; and
a tubular segment, fixed to the first and second ring members so as to hold the ring members in mutual longitudinal alignment, thereby defining a lumen passing through, the ring members.