Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1998-05-15
1999-10-19
Jaworski, Francis J.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600462, 128903, A61B 800
Patent
active
059679891
ABSTRACT:
A parameter indicative of the status of fluid flow is remotely monitored in a vessel, a natural graft, or a synthetic graft. One or more transducers are provided either in a wall of a synthetic graft or adjacent to a vessel or natural graft to monitor the parameter. A conformal array transducer or a tilted element is used to monitor fluid flow or velocity through the graft or vessel based on the effect of the fluid on ultrasonic waves produced by the transducers. The conformal array transducer comprises a plurality of elements that curve around the graft or vessel and are excited with an input signal provided by an implantable electronics circuit, producing ultrasonic waves that propagate into the fluid flowing within the graft or vessel. Transit time or Doppler measurements are made using an appropriate number of these transducer to determine either fluid flow or velocity. Various implantable electronic circuits are provided that enable a selected transducer to be driven and to receive an ultrasonic signal or a pressure signal indicative of the status of fluid flow monitored by the transducer. The implanted electronic circuit is connected to an implanted radio frequency (RF) coil. An external coil that is connected to a power supply and monitoring console is coupled to the implanted RF coil to convey power and receive data signals from the transducer that are indicative of the parameter being monitored.
REFERENCES:
patent: 4198987 (1980-04-01), Cain et al.
patent: 4227407 (1980-10-01), Drost
patent: 4550606 (1985-11-01), Drost
patent: 4926875 (1990-05-01), Rabinovitz et al.
patent: 5205292 (1993-04-01), Czar et al.
patent: 5289821 (1994-03-01), Swartz
patent: 5368039 (1994-11-01), Moses
patent: 5411551 (1995-05-01), Winston et al.
patent: 5453576 (1995-09-01), Krivitski
patent: 5588436 (1996-12-01), Narayanan et al.
patent: 5595182 (1997-01-01), Krivitski
patent: 5628782 (1997-05-01), Myers et al.
patent: 5669388 (1997-09-01), Vilkomerson
patent: 5680863 (1997-10-01), Hossack et al.
patent: 5833603 (1998-11-01), Kovacs et al.
Vilkomerson, David, et al., "Higher-Order Diffracting-Grating Transducers," SPIE, vol. 3037,0277-786X/97, pp. 206-212.
"Cardiac Output," Medical Electronics, Apr. 1996, 7 pp.
Crystal Biotech, Inc. Brochure, "2/4/T Transducer System," CBI Physiological Research Systems CBI-8000, 2 pp.
Crystal Biotech, Inc. (CBI) Brochure, "Blood Flow Transducers, DBF Soft Silastic.RTM., Assemblies and Transducers for Pulsed Doppler Blood Flow Velocimetry," Data Sciences International, 2 pp.
Crystal Biotech, Inc. (CBI) Brochure, "Blood Flow Transducers, HDP Hard Epoxy Transducers for Pulsed Doppler Flow Velocimetry," Data Sciences International, 2 pp.
Kikuchi, T., et al., "Ultrasonic Imaging System Using Interdigital Transducer," 1982 IEEE Ultrasonics Symposium, 0090-5607/82/0000-0618, pp. 618-622.
Matsunaka, T., et al., "Miniature Doppler Probe Using a Unidirectional Saw Transducer," Aloka Co., Ltd. 3-7-19 Imai Ohme, Tokyo 189, Japan, 4 pp.
Nomura, Tooru, et al., "Measurement and Mapping of Elastic Anisotropy of Solids Using a Leaky Saw Excited by an Interdigital Transducer," IEEE Transactions on Sonics and Ultrasonics, vol. SU-32, No. 2, Mar. 1985, pp. 235-240.
Moriizumi, Toyosaka, et al., Abstract, "Selection of Piezoelectric Materials Used for Interdigital Transducer in Water," The Transactions of the IECE of Japan, vol. E65, No. 5, May 1982, p. 288.
Nomura, T., et al., "Two Dimensional Mapping of Saw Propagation Constants by Using Fresnel-Phase-Plate Interdigital Transducer," 1983 IEEE Ultrasonics Symposium, pp. 621-626.
Sanghvi, N.T., et al., "Frequency Scanning, Front Viewing, Alternating Polarity Transducer Array for Ultrasound Imaging System," SPIE (International Society for Optical Engineering), Reprinted from "New Developments in Ultrasonic Transducers and Transducer Systems," Jul. 21-22 1992, San Diego, California, vol. 1733, 5 pp.
Transonic Systems Inc. Brochure, "Ultrasonic Transit-Time Volume Flowmeters," Oct. 1991, 2 pp.
Drost, Cornelis J., "Vessel Diameter-Independent Volume Flow Measurements Using Ultrasound," Proceedings of the San Diego Biomedical Symposium, vol. 17, 1978, 4 pp.
Mehdian, M., et al., "Blood Flow Measurement Using a Highly Filled Carbon Polymer Sandwich Sensor and an Elasto-Pseudo Compressible Vascular Flow," Part H, Journal of Engineering in Medicine, vol. 210, 1996, 8 pp.
Data Sciences International, Inc. Brochure, "Data Acquisition, Dataquest.TM. A.R.T..TM., Advanced Research Technology Data Acquistion Platform & System, For Continuous and/or Scheduled Collection, Viewing, and Analysis of Physiological Data," SMD30043 REL01 Apr. 97, 4 pp.
Data Sciences International, Inc. Brochure, "PhysioTel.COPYRGT., CA, ETA and CTA Implants, For Measuring a Biopotential, Temperature and Activity," Brochure SMD30039 REL01 Oct. 1995, 2 pp.
Toda, Kohji, et al., "Acoustic Focusing Device With an Interdigital Transducer," J. Acoust. Soc. Am., vol. 62, No. 4, Oct. 1977, pp. 1033-1036.
Transonics Systems Inc. Brochure, "Ultrasonic Transit Time Theory of Operation," 2 pp.
Cimochowski George E.
Keilman George W.
Anderson Ronald M.
Imam Ali M.
Jaworski Francis J.
VascuSense, Inc.
LandOfFree
Ultrasonic sensors for monitoring the condition of a vascular gr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ultrasonic sensors for monitoring the condition of a vascular gr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultrasonic sensors for monitoring the condition of a vascular gr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2049054