Fluid Delivery Catheter with Pressure-Actuating Needle Deployment and Retraction

摘要

A fluid delivery catheter that uses micro-needles for fluid delivery though a vessel wall. The catheter may provide fluid delivery therapy for various procedures, such as, for example, delivery of tumescent fluid or renal denervation. The catheter includes an elongate member with deployable and retractable needles disposed about a distal end of the elongate member. The needles may be disposed radially about the distal end and/or along a length of the distal end.

主权项

1. A method of delivering a fluid at a treatment site within a hollow anatomical structure (HAS), the method comprising:
positioning a treatment length of an elongate catheter at the treatment site, the treatment length including an outer sleeve defining a plurality of spaced apertures and a sleeve lumen; a flexible inner lining defining a plurality of independently pressure-deformable portions and a lining lumen disposed within the sleeve lumen, wherein each of the plurality of pressure deformable portions are generally aligned with one of the plurality of spaced apertures; and a plurality of micro-needles, each micro-needle being secured to one of the pressure-deformable portions and in fluid communication with the lining lumen, wherein the pressure-deformable portions and the micro-needles are recessed beneath an outer surface of the outer sleeve in an at-rest state; deforming the pressure-deformable portions to an extended position in which at least a portion of the micro-needles protrude above the outer surface of the outer sleeve to penetrate a wall of the HAS; and delivering the fluid under pressure into the lining lumen, through needle lumens of the micro-needles and into the HAS wall.