Abstract: The invention relates generally to methods and systems for the treatment of pelvic tissues using a high pressure injection device to deliver a therapeutic composition that includes a large molecule therapeutic agent, such as a nucleic acid or a polypeptide, to a target tissue in the pelvic area. Methods of the invention can improve delivery of the therapeutic agent into the tissue, which can be beneficial for the treatment of a pelvic tissue disorder, such as bladder and prostate tumors.

Abstract: A non-metal, polymeric tubular device for delivering a therapeutic fluid to a treatment site within a patient. The non-metal, polymeric tubular device can be fabricated using suitable high strength polymers and in some versions can be reinforced through the inclusion of reinforcement materials or braiding. The non-metal, polymeric tubular device can be fabricated so as to have a burst strength exceeding at least about 2,000 psi. The non-metal, polymeric tubular device can be fabricated so as to have distention properties, wherein an orifice or jet port located at a distal end of the polymeric tubular device retains its shape and/or size without suffering swelling that can have a detrimental impact on a fluid jet used to deliver the therapeutic fluid at the treatment site.

Abstract: A needleless injection system is provided to deliver therapeutic fluids to an internal treatment site in a patient, where the system is pressurized and is capable of compensating for differences in injection media viscosity and mechanical system characteristics. In one aspect, a needleless therapeutic fluid injection system is provided that includes modular, interchangeable components. In particular, the system includes a console that generally includes the electronic and/or hydraulic control components for the system, an injection chamber, and a shaft or catheter tube.

Abstract: 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.

Abstract: Needleless injection device components, systems, and methods that involve features including an elongate shaft that has a working shaft comprising a working shaft proximal end, a working shaft distal end, and a working lumen extending between the working shaft proximal end and the working shaft distal end, an injection shaft including an injection shaft proximal end, an injection shaft distal end, and a needless injection orifice disposed through the sidewall at the injection shaft distal end, the injection shaft moveably disposed within the working lumen, and a tissue tensioner secured to the injection shaft at the injection shaft distal end and moveable relative to the working lumen, the tissue tensioner having an expandable surface capable of exhibiting an expanded state and a non-expanded state, the tissue tensioner in the expanded state being capable of tensioning luminal tissue for injection by the needless injection orifice.