Catheter assembly
Devices and methods are provided to conduct fluid away from or deliver fluid to an area of a treatment site of a patient's body. In one aspect of the invention, a catheter includes a terminal end with a fluid exchange portion. The terminal end may further include a diffuser. The terminal end may further include a barrier.
1. A method of transporting fluid between a treatment site of a patient and a location outside of the patient, the method comprising:
providing a catheter having a first elongated fluid conduit having an outer diameter; a second elongated fluid conduit; and a terminal end locatable at the treatment site, the first elongated fluid conduit defining a fluid path to the terminal end and the second elongated conduit defining a fluid path from the terminal end, the terminal end comprising: a first fluid exchange portion defining a first outer surface and a first lumen in fluid communication with the first elongated fluid conduit, the first fluid exchange portion having at least one opening communicating between the first lumen and the first outer surface; and a second fluid exchange portion defining a second outer surface and a second lumen in fluid communication with the second elongated fluid conduit, the second fluid exchange portion having at least one opening communicating between the second lumen and the second outer surface; and a barrier having a first barrier surface and an opposing second barrier surface, the first lumen being in fluid communication with the first barrier surface and the second lumen being in fluid communication with the second barrier surface;
placing the terminal end from the location outside of the patient, through a tissue opening, to a location inside of the patient at the treatment site;
positioning the barrier to bias fluid flow at the treatment site to impede fluid flow in a non-preferential direction; and
operating the catheter to deliver fluid to the first barrier surface; and
extracting the terminal end through the tissue opening to transition the barrier from a deployed configuration to a collapsed configuration having a maximum cross-sectional dimension not exceeding the outer diameter of the catheter.
2. The method of claim 1 further comprising operating the catheter to remove fluid from the second barrier surface.
3. The method of claim 1 wherein the catheter further comprises a diffuser in fluid communication with the first barrier surface, the method further comprising: wicking fluid via the diffuser to treat a surface area of tissues at the treatment site.
4. The method of claim 3 wherein the first elongated fluid conduit and the second elongated fluid conduit are contained in a multi-lumen conduit, the multi-lumen conduit and the terminal end defining a junction between them, a multi-lumen conduit portion of the junction having a first junction outer transverse dimension and a terminal end portion of the junction having a second junction outer transverse dimension, the first junction outer transverse dimension being larger than the second junction outer transverse dimension, the multi-lumen conduit and the terminal end forming a step between them, the method further comprising:
collapsing the barrier and diffuser behind the step to facilitate passage of the terminal end through patient tissues at the treatment site.