Patent ID: 8579956

Claim:
An apparatus comprising: an expandable body suitable for insertion into a blood vessel and capable of expanding from a first diameter to a second diameter in response to an inflation pressure, the expandable body comprising: an outer wall having a working length, a plurality of needles extending from the outer wall, each of the needles having a lumen in fluid communication with an aperture formed in the outer wall, and a plurality of recesses extending through only a portion of the outer wall, the recesses dimensioned to hold a treatment agent; a delivery cannula coupled to the expandable body, the delivery cannula in fluid communication with each aperture such that a fluid introduced through the delivery cannula to expand the expandable body from the first diameter to the second diameter is delivered through the needles; and a stent having struts and openings between the struts, the stent overlying the outer wall such that the needles align with the openings and the recesses align with the struts, wherein the first diameter comprises a collapsed configuration and the second diameter comprises an expanded configuration, wherein the expanded configuration advances the needles through the openings to place the needles in contact with portions of a lesion exposed through the openings and releases the treatment agent into the blood vessel.