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| Number | Title | Issue Date |
| 4744368 | Method and means for detecting pregnancy in domestic farm animal A device for detecting pregnancy in animals comprises a finger receptacle adapted to fit over a human finger. On the outer surface of the receptacle is a transducer housing having a transducer therein for transmitting ultrasonic sound waves and for receiv... | 05/17/1988 |
| 4722347 | Apparatus for measuring cardiac output Blood flow in the aorta and pulmonary artery of a mammal, most typically a human, is measured volumetrically by a non-invasive, ultrasound apparatus. A piezoelectric ultrasound transducer mounted on a probe and inserted into the trachea in great proximity... | 02/02/1988 |
| 4719923 | Non-invasive blood flow measurements utilizing autoregressive analysis with averaged reflection coefficients A system for non-invasively determining the amount of blood flow within an internal patient blood vessel by performing an autoregressive analysis of Doppler shifted acoustical signals resulting from the reflection of ultrasonic signals due to blood cell m... | 01/19/1988 |
| 4667679 | Apparatus and method for positioning and puncturing an artery and a vein A blood flow detector produces a signal in response to pulsatile blood flow to provide means for positioning a slot in a plate in alignment with a patient's artery. Pressing the plate against the patient's skin retains the artery in alignment with the slo... | 05/26/1987 |
| 4667678 | Arterial blood velocity to volume flow converter A arterial blood velocity-to-volume flow rate converter, including a pair of function generators a computer, and a multiplier, is incorporated within a system to objectively measure by non-invasive means the blood volume flow rate to the head of an occupa... | 05/26/1987 |
| 4665925 | Doppler catheter A steerable catheter having a Doppler crystal at the tip to measure the velocity of blood in vivo--and inferentially the blood flow. The catheter includes two passageways, one passageway being exposed to the blood stream with the other passageway containi... | 05/19/1987 |
| 4641260 | Digital signal processing apparatus for a blood flowmeter using ultrasound Doppler effect A digital signal processing apparatus is shown which is applicable for real time operation in the power spectrum of the detected outputs of ultrasonic Doppler blood flowmeter. The apparatus comprises a digital operating means, a memory means which is conn... | 02/03/1987 |
| 4584880 | Tissue signature tracking tranceiver An ultrasound tranceiver providing enhanced imaging by selective filtering of the received signal to provide a variable frequency, constant bandwidth filtering of the received echo signals. The resulting signals are then detected to produce a signal, whic... | 04/29/1986 |
| 4541433 | Cardiac output monitor A cardiac output monitor of the type including an ultrasound crystal for use as a doppler flowmeter. The monitor is designed for mounting directly to a blood vessel, and is provided with a novel fixation apparatus which allows for easy and secure attachme... | 09/17/1985 |
| 4538618 | Fluid flow detector particularly useful for microvascular monitoring A fluid flow detector for the non-invasive detection of fluid flow particularly useful for microvascular monitoring comprises a head adapted to be placed against the object through which the fluid flows, a Doppler fluid flow sensor carried by the head, an... | 09/03/1985 |
| 4515164 | Differential doppler for blood flow measurement A portable apparatus for determining the degree of occlusion in a blood vessel. The apparatus includes a transmitter for producing an ultrasonic signal, a first probe for directing the ultrasonic signal to a first location in a blood vessel and a second p... | 05/07/1985 |
| 4503861 | Fetal heartbeat doppler transducer A doppler transducer which is particularly well adapted for use in fetal heartbeat measurements is comprised of a piston type transducer with a pair of lenses, which together provide both a divergent acoustic pattern and a flat surface for good acoustic c... | 03/12/1985 |
| 4424814 | Perfusion ratio detector The detector provides an effective means of non-invasively monitoring the perfusion of blood by external cardiac massage during a cardiac arrest. A Doppler probe is adhesively placed on the patient's skin, preferably to sense the carotid pulse which has b... | 01/10/1984 |
| 4417584 | Real-time measuring method and apparatus displaying flow velocities in a segment of vessel The invention relates to a Doppler velocimeter comprising a transmitter composed of a plurality of independent transducers for generating beams of ultrasonic energy, an ultrasonic generator for generating a plurality of noise signals, each noise signal be... | 11/29/1983 |
| 4355643 | Vacuum cup doppler flow transducer and method for using same The present invention comprises a vacuum cup having a concave undersurface on which is mounted a doppler flow transducer. A vacuum tube is in communication with the undersurface of the cup and is capable of removing the air from beneath the suction cup so... | 10/26/1982 |
| 4239047 | Method and apparatus for aurally determining presence or absence of pathological stenosis A Doppler scan is made of a person's blood vessels, a recording is made of the resulting plural-frequency sounds, and then successive aural sensings of selected frequency-range portions of that Doppler scan recording are made.... | 12/16/1980 |
| 4154231 | System for non-invasive cardiac diagnosis A system for detecting, quantizing, and displaying simultaneously on a single recording a wide panorama of cardiac diagnostic information including data inputs from EKG, phono-doppler, sound, and pulse; displaying each input in a distinctive color or form... | 05/15/1979 |
| 4127842 | Apparatus for the measurement of flowing media according to the ultrasonic doppler method To compensate the Doppler flow measurement for the angle of the ultrasonic beam relative to the flowing medium, the ultrasonic applicator includes a mechanical electrical angular position sensor for generating a signal as the applicator is shifted from a ... | 11/28/1978 |
