Devices, systems, and methods for delivering fluid to tissue

摘要

A needleless fluid injection device including a flexible shaft with a proximal end, a distal end, an injection lumen extending from the proximal end to the distal end of the shaft, and at least one injection orifice extending through a wall of the injection lumen at the distal end of the shaft. The injection lumen can include a depth-limiting system (462) at its distal end for controlling the depth of insertion of the injection lumen relative to a target tissue of a patient. The injection lumen can alternatively or additionally include at least one guidance feature. The injection lumen can alternatively or additionally include at least one flow-modifying protrusion extending from the inner tubular wall of the injection lumen and toward a longitudinal axis of the injection lumen.

主权项

1. A needleless fluid injection device comprising a flexible shaft comprising:
a proximal end, a distal end, a central longitudinal axis extending from the proximal end to the distal end., an injection catheter extending from the proximal end past the distal end of the shaft, wherein the injection catheter comprises a longitudinal axis that is radially offset from the central longitudinal axis, at least one injection orifice extending through a wall of the injection catheter adjacent to the distal end of the shaft, and at least one protrusion extending from a distal end of the injection catheter, wherein the at least one protrusion is visually detectable as a guidance feature, and wherein the injection catheter comprises an elongated lumen that is open and free of obstructions along its length.