Abstract: Blood flow monitors and methods of monitoring characteristics of tissue are described. An example method of monitoring characteristics of tissue includes: placing a tissue flap at a point of treatment, the tissue flap is a section of tissue that includes a blood vessel; attaching a first sensor to the tissue flap to monitor blood flow through the blood vessel; attaching the first sensor to a blood flow monitor that has a first visual display field and a second visual display field; attaching a second sensor to the tissue flap to monitor a characteristic of the tissue flap; attaching the second sensor to the blood flow monitor; activating the blood flow monitor to observe the blood flow through the first blood vessel and the characteristic of the tissue flap; and monitoring the blood flow through the first blood vessel over a period of time and the characteristic of the tissue flap.

Abstract: An example method of calibrating a blood flow monitoring device includes positioning a remote device and a blood flow monitor within physical proximity of one another, placing the remote device in a calibration mode such that a microphone of the remote device is active and can receive Doppler sounds emitted by a speaker of the blood flow monitor; emitting Doppler sounds through the speaker of the blood flow monitor; receiving the Doppler sounds as received Doppler sounds using the microphone of the remote device; emitting the received Doppler sounds through a speaker of the remote device as remote device sounds; receiving the remote device sounds using the microphone of the remote device; identifying any differences between the received Doppler sounds and the received remote device sounds; and calibrating the remote device based on the identified differences between the received Doppler sounds and the received remote device sounds.