Device for minimally invasive release of a treatment substance

摘要

A needle assembly for delivering a treatment substance to a location in the body, the needle assembly comprising: a delivery needle (2010) defining a delivery lumen (2012) and a delivery needle wall (2019), a proximal end (2015) and a distal end (2014) wherein the delivery needle wall has one or more patterns (304) to increase the flexibility of the delivery needle; a plurality of inner needles (2040), each inner needle defining an inner needle lumen (2039) and having an inner needle wall (2041), a proximal end and a distal end (2045), the plurality of needles for transition between a retracted position and an extended position Position is configured; and a treatment substance source in fluid communication with the inner needle lumens of the plurality of inner needles; wherein each of the plurality of inner needles is configured to extend in a distal direction and to expand outwardly from the distal end of the delivery needle when in the extended position; and wherein the plurality of inner needles are housed in the retracted position in the delivery lumen.