| abstract |
Described embodiments include apparatus ( 20 ) that includes an assembly of tubes ( 34 ), each one of the tubes being shaped to define a tube lumen ( 62 ). The apparatus further includes a plurality of tissue anchors ( 60 ), each one of the tissue anchors being disposed within a respective one of the tube lumens, an expandable annular structure ( 36 ), including a plurality of teeth ( 40 ), coupled to the assembly of tubes, and a plurality of control wires ( 38 ) coupled to the annular structure, configured to position the tubes for deployment of the tissue anchors from the tube lumens, by manipulating the annular structure. Other embodiments are also described. |