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| Number | Title | Issue Date |
| 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 |
| 4563899 | Ultrasonic imaging apparatus using transducer control In an ultrasonic imaging apparatus, the pulser applies drive pulses to the transducer element. Depending upon the transducer characteristics and the scanning mode of the ultrasonic beams, the pulser is required to apply proper drive voltage to a given tra... | 01/14/1986 |
| 4559952 | Method of ultrasonically measuring blood flow velocity Method and apparatus for ultrasonic blood flow velocity measurement based upon the doppler principle (doppler measurement), combined with simultaneous echo amplitude imaging by employing ultrasonic pulses (echo imaging). The method is used for investigati... | 12/24/1985 |
| 4556067 | Bandwidth indicator for Doppler blood flowmeters The analog broadband output signal of a medical Doppler device is sampled at a constant rate to convert the signal to digital form. The sample values are stored consecutively in a random access memory component. Such values are recalled from such componen... | 12/03/1985 |
| 4209022 | Echography apparatus for medical diagnosis, using a multiple-element probe An ultra-sonic echography apparatus comprises a probe with multiple elements switched at the rate of transmission pulses and moved along a contour of the test body. Its position is registered by a pantograph cooperating with three sine-cosine potentiomete... | 06/24/1980 |
| 4198987 | Measuring system including elements implantable beneath the skin A system is disclosed having a portion permanently implantable beneath the skin to perform in vivo measurements, such as Doppler ultrasonic blood flow velocity measurements. Measurement information is transmitted out through the skin by means of ultrasoni... | 04/22/1980 |
| 4152928 | System for detecting fat particles in blood A system utilizing a bank of frequency staggered band-pass filters spanning the range in which fat emboli are known to occur is provided for the early detection of fat emboli in blood.... | 05/08/1979 |
| 4109642 | Apparatus for ultrasonic arteriography Continuous wave ultrasonic sound waves from a transmitter and receiver are highly focused to a width of approximately 1 millimeter or less and are transmitted and received through intersecting paths within the tissue of a patient. A doppler flow detector ... | 08/29/1978 |
| 4062237 | Crossed beam ultrasonic flowmeter A crossed beam ultrasonic flowmeter particularly suited for measuring two dimensional arterial blood flow has two pairs of ultrasonic beam transmitting transducers the beams of which are focused to intersect at a predetermined region through which dynamic... | 12/13/1977 |
| 3987673 | Ultrasonic transducer devices A flowmeter for measuring blood flow in a vascular channel by Doppler Techniques has an assembly of electro-ultrasonic transducers which direct ultrasonic radiation to a zone spaced from the assembly and receive radiation reflected therefrom. The transduc... | 10/26/1976 |
| 3948248 | Method of measuring ocular pulse A method of obtaining a reading of the ocular pulse in its unbiased, natural state by transmitting continuous wave ultrasonic energy to the eye from a source spaced from the eye, receiving said energy reflected back from said eye, and detecting a modulati... | 04/06/1976 |
| 3939707 | Measurement of liquid flow A method of pulse-echo ultrasonic examination of an object, particularly in medical diagnostic examination, to measure flow of liquid in a vessel within the object comprises determining the dimensions and orientation of the vessel and the shift in frequen... | 02/24/1976 |
