Catheter including one or more sensors

A method comprising:

• controlling a light source to emit light to expose a fluorescence material to the emitted light, wherein the fluorescence material within a fluid is configured to fluoresce when exposed to the light in the lumen defined by an elongated body comprising a proximal portion and a distal portion;
• detecting, with a light detector, the fluorescence of the fluorescence material;
• and
• determining, based on the detected fluorescence, oxygen in the fluid within the lumen.

A system comprising:

• an elongated body defining a lumen, the elongated body comprising a proximal portion and a distal portion;
• an anchoring member positioned on the proximal portion of the elongated body;
• a fluorescence material configured to be located within the lumen with a fluid in the lumen;
• a light source configured to emit light to expose the fluorescence material to the emitted light, wherein the fluorescence material within the fluid is configured to fluoresce when exposed to the light in the lumen;
• a light detector configured to detect the fluorescence of the fluorescence material;
• a sensor body configured to be releasably coupled to the elongated body, the sensor body supporting the light source and the light detector;
• a lens configured to be placed on the elongated body in between the fluorescence material and light source;
• a first ultrasonic sensor configured to transmit a first ultrasonic signal in a first direction through a fluid flowing distally within the lumen;
• and
• a second ultrasonic sensor configured to transmit a second ultrasonic signal in a second direction through the fluid flowing distally within the lumen, the second ultrasonic sensor being positioned on the elongated body proximal to the first ultrasonic sensor;
• wherein the system is configured to detect oxygen in the fluid within the lumen based on the detected fluorescence.