# US 2021/0275049 A1 · Vascular assessment device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0275049 A1 - Document ID: US20210275049A1 - Status: Published application - Kind: A1 - Application number: 16/998,407 - Filed: 2020-08-20 - Published: 2021-09-09 - Earliest claimed: 2020-03-05 - Assignees: CardiacM CO., Ltd. - Applicants: CardiacM CO., Ltd. - Inventors: Teh-Ho TAO - Web page: https://patentgrep.com/patent/US20210275049A1 ## CPC - A61B 5/05: Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves (measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24) - H01Q 1/273: {Adaptation for carrying or wearing by persons or animals} - A61B 5/363: Detecting tachycardia or bradycardia - A61B 5/6801: {specially adapted to be attached to or worn on the body surface} - A61B 5/6804: {Garments; Clothes} - A61B 5/721: {using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured} - A61B 5/7264: {Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems} - C08L 33/04: Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} - C08L 79/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors - D02G 3/045: {all components being made from artificial or synthetic material} - H01Q 1/085: {Flexible aerials; Whip aerials with a resilient base} - H01Q 1/38: formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142)} - H01Q 1/40: Radiating elements coated with or embedded in protective material - H01Q 1/526: {Electromagnetic shields} - H01Q 9/0407: {Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40)} - H01Q 9/0485: {Dielectric resonator antennas} - H01Q 9/06: Details - H01Q 9/40: Element having extended radiating surface - H04Q 9/00: Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom - A61B 5/026: Measuring blood flow {(A61B3/1233, A61B3/1241 take precedence)} - A61B 2562/164: the sensor is mounted in or on a conformable substrate or carrier - A61B 2562/166: the sensor is mounted on a specially adapted printed circuit board - A61B 2562/182: Electrical shielding, e.g. using a Faraday cage - H01Q 23/00: Antennas with active circuits or circuit elements integrated within them or attached to them - H04Q 2209/40: using a wireless architecture - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) ## Abstract A vascular assessment device includes an antenna unit and a fabric unit. The antenna unit includes a substrate, a transmitting antenna and a receiving antenna spaced apart disposed on the substrate, and a circuit module disposed on the substrate. The circuit module cooperates with the transmitting antenna to emit a carrier radio wave toward a fistula of a subject, and receives, via the receiving antenna, a return wave signal formed through reflection of the carrier radio wave. The fabric unit is sleeved on the antenna unit, and includes an isolating layer adapted to be disposed between the transmitting antenna and the skin above the fistula. The fabric unit has a dielectric constant not greater than 3. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The vascular assessment device of claim 1, wherein said isolating layer is a plain weave. ### Claim 3 (depends on 2) The vascular assessment device of claim 2, wherein said isolating layer is made of a tetoron cotton blended fabric. ### Claim 4 (depends on 3) The vascular assessment device of claim 3, wherein tetoron is present in an amount that ranges from 30 wt % to 40 wt %, and cotton is present in an amount that ranges from 60 wt % to 70 wt % based on the total weight of the tetoron cotton blended fabric. ### Claim 5 (depends on 2) The vascular assessment device of claim 2, wherein said isolating layer is made of a flax cotton blended fabric. ### Claim 6 (depends on 5) The vascular assessment device of claim 5, wherein flax is present in an amount of 55 wt %, and cotton is present in an amount of 45 wt % based on the total weight of the flax cotton blended fabric. ### Claim 7 (depends on 1) The vascular assessment device of claim 1, wherein said isolating layer has a thickness ranging from 0.2 mm to 0.4 mm. ### Claim 8 (depends on 1) The vascular assessment device of claim 1, wherein said substrate has a thickness that is not smaller than 0.3 mm. ### Claim 9 (depends on 1) The vascular assessment device of claim 1, wherein said substrate is made of a material selected from the group consisting of polyimide, and polyester. ### Claim 10 (depends on 1) The vascular assessment device of claim 1, wherein said fabric unit further includes a protecting layer that is configured to cooperate with said isolating layer to form an accommodating space for receiving said antenna unit. ### Claim 11 (depends on 1) The vascular assessment device of claim 1, wherein said transmitting antenna includes a transmitting component and a transmitting line that extends from said transmitting component to said circuit module, and said receiving antenna includes a receiving component and a receiving line that extends from said receiving component to said circuit module, said transmitting component and said receiving component being spaced apart from each other by a spacing. ### Claim 12 (depends on 11) The vascular assessment device of claim 11, wherein said transmitting line has an extending length ranging from 2 cm to 4 cm. ### Claim 13 (depends on 11) The vascular assessment device of claim 11, wherein said receiving line has an extending length ranging from 2 cm to 4 cm. ### Claim 14 (depends on 11) The vascular assessment device of claim 11, wherein said spacing is greater than 0.8 mm. ### Claim 15 (depends on 1) The vascular assessment device of claim 1, wherein said antenna unit further includes a metal shield layer disposed on said substrate that is opposite to said transmitting antenna and said receiving antenna.