Catheter assemblies, oxygen-sensing assemblies, and related methods

An oxygen-sensing assembly for attachment to a urinary catheter, the oxygen-sensing assembly comprising:

• a housing having a flow pathway extending between an inlet end and an outlet end thereof;
• an oxygen sensor in operable communication with the flow pathway of the housing, the oxygen sensor configured to detect oxygen tension of a fluid flowing through the flow pathway;
• a flowrate sensor disposed in the flow pathway and configured to detect a flowrate of the fluid flowing through the flow pathway;
• and
• a control system operably coupled to the oxygen sensor and the flowrate sensor, the control system comprising:
• at least one processor;
• and
• at least one non-transitory computer-readable storage medium storing instructions thereon that, when executed by the at least one processor, cause the control system to determine a risk of acute kidney injury based, at least in part, on a mass flowrate of oxygen determined by the oxygen tension of the fluid and the flowrate of the fluid.

A method, comprising:

• attaching an oxygen-sensing assembly to a urinary catheter;
• disposing the urinary catheter within a bladder of a subject;
• detecting oxygen tension within a fluid flowing through the urinary catheter and through a flow pathway of a housing of the oxygen-sensing assembly with an oxygen sensor;
• detecting a flowrate of the fluid flowing through the flow pathway with a flowrate sensor;
• based at least partially on one or more of the detected oxygen tension and the detected flowrate of the fluid, determining a mass flowrate of oxygen of the fluid flowing through the flow pathway;
• and
• based at least partially on the mass flowrate of oxygen of the fluid flowing through the flow pathway, determining a risk of acute kidney injury of the subject, determining medulla oxygenation of the subject, or both.