Ultrasonic echograph for measuring high velocities of blood flows
December 10, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDoppler ultrasonic diagnostic apparatus Examining moving objects by ultrasound echograpy Pulse doppler flow speed meter Device for measuring the speed of blood flows by ultrasonic echography at an increased measuring speed Device for eliminating fixed echoes for an ultrasonic echograph Ultrasonic diagnostic apparatus Ultrasonic flowmeter Patent #: 5201313 InventorsApplicationNo. 988620 filed on 12/10/1992US Classes:600/454, Blood flow studies73/861.25, Reflection or scattering of acoustic waves600/455, Pulse Doppler600/456With volumetric measurementExaminersPrimary: Kamm, William E.Assistant: Manuel, George Attorney, Agent or FirmInternational ClassA61B 008/00Foreign Application Priority Data1991-12-11 FRAbstractAn echograph includes a transmission stage (20), a circuit (31) for suppressing fixed echos, and a correlation-interpolation circuit (33).The the transmission stage (20) transmits a pulsed signal having two neighboring, alternating recurrent periods T1 and T2, the fixed echo suppression circuit (31) being adapted to double the recurrent period and comprises two outputs having the index even and odd, the correlation-interpolation circuit (33) performing, for each velocity, two distinct correlations, one of which is associated with the period T1 whereas the other is associated with the period T2, after which these two correlations are compared so as to derive a non-ambiguous velocity value therefrom.Other References
Field of SearchReflection or scattering of acoustic waves | |
