A system comprising: a delivery catheter loaded with multiple tacks, each tack configured to be individually deployed for holding plaque against a blood vessel wall, each of the tacks comprising: a frame consisting of a single column of cells, the column of cells comprising: a pair of concentric side rings (290a, 290b, 300a, 300b) spaced apart coaxially from each other, each of said pair of concentric side rings having a compressed state and an expanded state, wherein each side ring comprises a plurality of struts in an undulating pattern defined by long struts connected to form a first apex and short struts connected to form a second apex, and each side ring forms a respective end of the device; and a plurality of longitudinally extending bridge members (290d, 300d) connecting the pair of concentric side rings, wherein each bridge member of the plurality of longitudinally extending bridge members connects to one of the pair of concentric side rings at one end and to the other of the pair of concentric side rings at the opposite end; and one or more barbs on each of the bridge members; wherein each cell of the single column of cells comprises a portion of each of the pair of concentric side rings and two of the plurality of longitudinally extending bridge members. a delivery catheter loaded with multiple tacks, each tack configured to be individually deployed for holding plaque against a blood vessel wall, each of the tacks comprising: a frame consisting of a single column of cells, the column of cells comprising: a pair of concentric side rings (290a, 290b, 300a, 300b) spaced apart coaxially from each other, each of said pair of concentric side rings having a compressed state and an expanded state, wherein each side ring comprises a plurality of struts in an undulating pattern defined by long struts connected to form a first apex and short struts connected to form a second apex, and each side ring forms a respective end of the device; and a plurality of longitudinally extending bridge members (290d, 300d) connecting the pair of concentric side rings, wherein each bridge member of the plurality of longitudinally extending bridge members connects to one of the pair of concentric side rings at one end and to the other of the pair of concentric side rings at the opposite end; and one or more barbs on each of the bridge members; wherein each cell of the single column of cells comprises a portion of each of the pair of concentric side rings and two of the plurality of longitudinally extending bridge members. a frame consisting of a single column of cells, the column of cells comprising: a pair of concentric side rings (290a, 290b, 300a, 300b) spaced apart coaxially from each other, each of said pair of concentric side rings having a compressed state and an expanded state, wherein each side ring comprises a plurality of struts in an undulating pattern defined by long struts connected to form a first apex and short struts connected to form a second apex, and each side ring forms a respective end of the device; and a plurality of longitudinally extending bridge members (290d, 300d) connecting the pair of concentric side rings, wherein each bridge member of the plurality of longitudinally extending bridge members connects to one of the pair of concentric side rings at one end and to the other of the pair of concentric side rings at the opposite end; and one or more barbs on each of the bridge members; wherein each cell of the single column of cells comprises a portion of each of the pair of concentric side rings and two of the plurality of longitudinally extending bridge members. a pair of concentric side rings (290a, 290b, 300a, 300b) spaced apart coaxially from each other, each of said pair of concentric side rings having a compressed state and an expanded state, wherein each side ring comprises a plurality of struts in an undulating pattern defined by long struts connected to form a first apex and short struts connected to form a second apex, and each side ring forms a respective end of the device; and a plurality of longitudinally extending bridge members (290d, 300d) connecting the pair of concentric side rings, wherein each bridge member of the plurality of longitudinally extending bridge members connects to one of the pair of concentric side rings at one end and to the other of the pair of concentric side rings at the opposite end; and one or more barbs on each of the bridge members; wherein each cell of the single column of cells comprises a portion of each of the pair of concentric side rings and two of the plurality of longitudinally extending bridge members.