Catheter including one or more sensors

A method comprising:

• transmitting, with a first ultrasonic sensor, a first ultrasonic signal in a first direction through a fluid flowing distally within a lumen defined by an elongated body comprising a proximal portion and a distal portion;
• transmitting, with a second ultrasonic sensor being positioned on the elongated body proximal to the first ultrasonic sensor, a second ultrasonic signal in a second direction through the fluid flowing distally within the lumen;
• receiving, with the first ultrasonic sensor, the second ultrasonic signal transmitted through the fluid flowing in the lumen;
• and
• receiving, with the second ultrasonic sensor, the first ultrasonic sound transmitted through the fluid flowing in the lumen.

A medical device system comprising:

• an elongated body defining a lumen, the elongated body comprising a proximal portion and a distal portion;
• a sensor coupled to the elongated body, the sensor comprising:
• a first ultrasonic sensor configured to transmit a first ultrasonic signal in a first direction through a fluid flowing distally within the lumen;
• 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;
• and
• processing circuitry configured to:
• determine a first transit time of the first ultrasonic signal, the first transit time is a time from transmission from the first ultrasonic sensor to reception by the second ultrasonic sensor;
• determine a second transit time of the second ultrasonic signal, the second transit time is a time from transmission from the second ultrasonic sensor to reception by the first ultrasonic sensor;
• and
• determine a flow velocity of the fluid through the lumen based on the determined first and second transit times of the first and the second ultrasonic signals.
• wherein the first ultrasonic sensor is configured to receive the second ultrasonic signal transmitted through the fluid flowing in the lumen;
• wherein the second ultrasonic sensor is configured to receive the first ultrasonic sound transmitted through the fluid flowing in the lumen.