Patent ID: 8357118

Claim:
An apparatus for treating tissue at a target site, the apparatus comprising: a catheter having proximal and distal regions; a balloon member disposed on the distal region of the catheter, the balloon having uninflated and inflated states; a plurality of pockets on a surface of the balloon member, wherein each of the plurality of pockets comprises a recess having a taper for receiving at least a portion of a needle; and a plurality of needles, wherein each of the plurality of needles comprises a taper, and wherein at least one needle is associated with at least one of the plurality of pockets and in fluid communication with the associated pocket, where the plurality of needles are operable to engage tissue when the balloon is in the inflated state, and each of the plurality of needles comprises openings sized to disperse a therapeutic agent from an associated pocket into the tissue when the balloon is in the inflated state, and where a first needle of the plurality of needles comprises a first length and a second needle comprises a second length different from the first length.