Catheters, catheter-based systems, and methods thereof for treating hypervolemia

A system for treating hypervolemia, comprising:

• a) a catheter including:
• a distal end portion having a closed distal end configured to at least temporarily reside within a vessel of a patient;
• a luminal ingress joined to a luminal egress at the distal end portion, the luminal ingress designed to convey an influent having a first osmotic concentration to the distal end portion, wherein an abluminal surface of the luminal ingress is configured to be in direct contact with a fluid within the vessel of the patient;
• and
• a semipermeable membrane configured to pass blood-borne water from the vessel into at least the distal end portion, the blood-borne water absorbed by the influent to produce an effluent having a second osmotic concentration lower than the first osmotic concentration;
• and
• b) a fluid-collection system including:
• a reservoir configured to collect the effluent;
• and
• a pump configured to move one or more fluids of the system including the influent and the effluent.

A method for treating hypervolemia, comprising:

• inserting a closed-ended catheter in a vessel of a patient, the close-ended catheter comprising:
• a distal end portion;
• a luminal ingress joined to a luminal egress at the distal end portion;
• and
• a semipermeable membrane;
• directing an influent into the luminal ingress having a first osmotic concentration;
• absorbing blood-borne water from the vessel into at least the distal end portion through the semipermeable membrane to produce an effluent having a second osmotic concentration lower than the first osmotic concentration;
• and
• directing the effluent out of the closed-ended catheter by way of the luminal egress.