Ureteroscope with integrated fluid channel

A method for removing a biological object from a location internal to a subject, the method comprising:

• pumping a first fluid flow through a supply lumen;
• redirecting the first fluid flow into an evacuation lumen to create a vacuum for entraining a second fluid flow from the location internal to the subject into the evacuation lumen and thereby aspirating the biological object through the evacuation lumen;
• recirculating at least a portion of the second fluid flow through one or more vent openings from the evacuation lumen into the location internal to the subject;
• and
• aspirating the first fluid flow and the second fluid flow through the evacuation lumen.

A system for removing a biological object from a location internal to a subject, the system comprising:

• an irrigation pump configured to introduce a first fluid flow into a supply lumen;
• an aspiration pump;
• an elongate tubular body comprising:
• an evacuation lumen extending between a distal opening at a distal end and a proximal opening at a proximal end, wherein the evacuation lumen is in fluid communication with the supply lumen adjacent to the distal opening and is in fluid communication with the aspiration pump at the proximal opening;
• the supply lumen in fluid communication with the irrigation pump, the supply lumen configured to introduce the first fluid flow as a liquid jet into the evacuation lumen to create a first vacuum level at the distal opening such that a second fluid flow is drawn from the location internal to the subject into the evacuation lumen through the distal opening and at least a portion of the biological object is further drawn from the location internal to the subject;
• and
• one or more vent openings disposed along the evacuation lumen at the distal end;
• one or more sensors;
• and
• a controller in communication with the irrigation pump, the aspiration pump, and the one or more sensors;
• wherein:
• the aspiration pump is configured to create a second vacuum level within the evacuation lumen;
• and
• the controller is configured to manage pressures within the location internal to the subject.