Surgery – Truss – Pad
Patent
1980-12-03
1982-10-19
Howell, Kyle L.
Surgery
Truss
Pad
128277, A61B 1000
Patent
active
043545025
ABSTRACT:
A system for detecting and quantifying air emboli in blood vessels which uses either an intravascular catheter 22 or an esophageal catheter 50. In a preferred embodiment, the intravascular catheter includes an elongated cylindrical tube of flexible material, the tube having a tip 22A and having formed therein an axial aspiration lumen 26 and a second axial lumen 28. An ultrasonic transducer 24, comprising an annular, cylindrical ring of piezoelectric material, is fitted over and secured to the tube adjacent its tip. A microcaxial cable passes through lumen 28 and is electrically interconnected with the ultrasonic transducer. In a preferred embodiment, the esophageal catheter includes a substantially cylindrical member 54 on which is fitted an ultrasonic transducer 52 comprising an annular, cylindrical ring of piezoelectric material. An elongated tube 58 is secured to the substantially cylindrical member, and a microcoaxial cable 62 passes through tube 58 and the substantially cylindrical member and is electrically connected to the ultrasonic transducer. In use, the intravascular catheter is positioned within a desired blood vessel after percutaneous insertion, and the esophageal catheter is positioned within the esophagus below the bifurcation of the trachea. A pulsed Doppler circuit (FIG. 9) energizes the transducer and provides a Doppler signal from return signals generated by the transducer as a result of returns of transmitted ultrasonic energy. A circuit (FIGS. 10 and 11) processes the Doppler signal to obtain various information useful in the diagnosis of air emboli.
REFERENCES:
patent: 3542014 (1970-11-01), Peronneao
patent: 3640271 (1972-02-01), Horton
patent: 3827115 (1974-08-01), Bom
patent: 3888238 (1975-06-01), Meindl et al.
patent: 3921622 (1975-11-01), Cole
patent: 3938502 (1976-02-01), Bom
patent: 3974681 (1976-08-01), Namery
patent: 4068521 (1978-01-01), Cosentino et al.
patent: 4112735 (1978-09-01), McKnight
patent: 4112773 (1978-09-01), Abts
patent: 4122713 (1978-10-01), Stasz et al.
Martin et al., "Ultrasonic Catheter Tip Instrument for Measurement of Vessel Cross-Sectional Area," Proceedings, 27th Annual Conference on Engineering in Medicine and Biology, vol. 16, p. 186, Oct. 1974.
Martin et al., "An Ultrasonic Catheter Tip Instrument for Measuring Volume Blood Flow," Proceedings, 1975 Ultrasonics Symposium, pp. 13-17, Sep. 1975.
Martin et al., "An Ultrasonic Catheter Tip Instrument for Measuring Volume Blood Flow," IEEE Transactions on Sonics and Ultrasonics, vol. SU-23, No. 3, p. 207, May 1976.
Daigle et al., "Nontraumatic Measurement of Aortic Blood Velocity Fields, Flow, and Wall Properties," Appearing in White, Ultrasound in Medicine, vol. 1, p. 352, 1978.
Martin et al., "Stroke Volume Measurement with an Ultrasonic Catheter Tip System," appearing in White, Ultrasound in Medicine, vol 3A, pp. 23-39, 1978.
Hisanaga et al., "A New Real-Time Sector Scanning System of Ultra-Wide Angle and Real-Time Recording of Entire Adult Cardiac Images: Transesophagus and Trans-Chest-Wall Methods," appearing in White, Ultrasound in Medicine, vol. 4, pp. 391-402, 1978.
Martin et al., "Signal Enhancement for Automatic Identification of Arterial Wall Echoes from an Intravessel Scanner," appearing in White, Ultrasound in Medicine, vol. 4, pp. 417-431, 1978.
Colley et al., "Intravascular Doppler Catheter for Detection of Air Emboli," Proc. of Amer. Soc. Anesthesiologists Symposium, Oct. 1978.
Martin et al., "Intravascular and Esophageal Ultrasonic Catheters for Detection of Air Emboli," Proc. of American Institute of Ultrasound Technical Specialists, 1978 Annual Meeting, Oct. 1978.
Martin et al., "Intravascular and Esophageal Ultrasonic Catheters for Detection of Air Emboli," Reflections, Sep. 1978.
MedaSonics Model D8 Versatone Advertising Brochure, and Enclosures, Sep. 1978.
Maroon et al., "Detection of Minute Venous Air Emboli with Ultrasound," Surgery, Gynecology & Obstetrics, pp. 1236-1238, Dec. 1968.
Edmonds-Seal et al., "Air Embolism Diagnosed with Ultrasound," Anaesthesia, vol. 24, No. 3, pp. 438-440, Jul. 1969.
Maroon et al., "An Ultrasonic Method for Detecting Air Embolism," J. Neurosurg., vol. 31, pp. 196-201, Aug. 1969.
Wells, "The Directivities of Some Ultrasonic Doppler Probes," Med. & Biol. Engng., vol. 8, No. 3, pp. 241-243, 254-255, 1970.
Nishi, "Ultrasonic Detection of Bubbles with Doppler Flow Transducers," 1971.
Michenfelder et al., "Evaluation of an Ultrasonic Device (Doppler) for the Diagnosis of Venous Air Embolism," Anesthesiology, vol. 36, No. 2, pp. 164-167, Feb. 1972.
Jacobson et al., "Ultrasonic Detection of Bloodstream Emboli," IEEE International Conference on Engineering in the Ocean Environment, pp. 141-147, Sep. 1973.
Fairbank, W. M. et al., "A New Non Invasive Technique for Cardiac Pressure Measurement: Resonant Scattering of Ultrasound from Bubbles,"
This invention was made during the course of a grant from the Department of Health, Education and Welfare of the United States Government.
Colley Peter S.
Martin Roy W.
Howell Kyle L.
Jaworski Francis J.
The Board of Regents of the University of Washington
LandOfFree
Intravascular catheter including untrasonic transducer for use i does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Intravascular catheter including untrasonic transducer for use i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intravascular catheter including untrasonic transducer for use i will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1334968