Vascular assessment device

A vascular assessment device adapted for determining blood flow in a fistula of a subject, comprising:

• an antenna unit including
• a substrate,
• an antenna module which includes a transmitting antenna and a receiving antenna that are spaced apart disposed on said substrate, and
• a circuit module which is disposed on said substrate, and which is configured to cooperate with said transmitting antenna to emit a carrier radio wave toward the fistula, and to receive, via said receiving antenna, a return wave signal which is formed through reflection of the carrier radio wave by the fistula;
• and
• a fabric unit which is sleeved on said antenna unit, and which includes an isolating layer that is adapted to be disposed between said antenna module and the skin above the fistula of the subject, and that has a dielectric constant that is not greater than 3.