Noninvasive pulse transducer for simultaneously measuring pulse pressure and velocity
Patent 5503156 Issued on April 2, 1996. Estimated Expiration Date: 
March 11, 2014. 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.
March 11, 2014. 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 ReferencesMiniature biofeedback instrument Patent #: 4450843 InventorAssigneeApplicationNo. 212172 filed on 03/11/1994US Classes:600/485, Measuring pressure in heart or blood vessel600/503Entire testing assembly supported on wristExaminersPrimary: Sykes, Angela D.Assistant: Huang, Stephen Attorney, Agent or FirmForeign Patent References
International ClassesA61B 005/02A61B 008/06 AbstractA pulse transducer is disclosed having a pressure sensor for detecting pulse pressure and a velocity sensor for simultaneously detecting pulse velocity in blood vessels. The present invention allows reproduction of pulse pressure and velocity waveforms. The present invention combines a conventional applanation tonometer with a mounted velocity sensor, such as a Doppler crystal. The velocity sensor is placed proximate to the pressure sensor to allow simultaneous detection of pulse velocity, in real time, at substantially the same location as the pulse pressure measurement. The sensing direction of the velocity sensor may be at an angle with respect to the sensing direction of the pressure sensor. The present invention may be applied vertically to a vessel for proper applanation, while ultrasound, traveling across the vessel, may be used to detect a major component of the velocity. The present invention further contemplates a method of simultaneously measuring pulse velocity and pressure with a pulse transducer.Other References
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