Surgery – Truss – Pad
Patent
1992-02-12
1994-05-10
Jaworski, Francis
Surgery
Truss
Pad
128700, 128713, 128734, A61B 504
Patent
active
053099176
ABSTRACT:
Cardiac monitoring is disclosed in which thoracic impedance and EKG signals are gathered and processed for improved resolution and accuracy. EKG signals are adaptively processed by digitizing, filtering, differentiating and raising the resultant differential by a power greater than one to emphasize changes in the slope of the EKG signal. Blocks of the thus processed EKG data are analyzed to identify peak amplitude and to compare spacing between peak amplitude adaptively to more accurately identify R wave peaks. Stroke volume is determined from a thoracic impedance signal and its time derivative. Preferably, a time-frequency distribution is taken of the time derivative thoracic impedance signal after low- and high-pass filtering to identify B and X wave events in the signal which are used to determine ventricular ejection time and dz/dt.sub.min for a determination of heart stroke volume by conventional methods. Alternatively, stroke volume is determined by a new relationship between a product of a pair of impedances simultaneously sensed on opposing sides of a patient's heart at the peak of a heartbeat.
REFERENCES:
patent: Re30101 (1979-09-01), Kubicek et al.
patent: 3149627 (1964-09-01), Bagno
patent: 3340867 (1967-09-01), Kubicek et al.
patent: 3452743 (1969-07-01), Rieke
patent: 3570474 (1971-03-01), Jonson
patent: 3730171 (1973-05-01), Namon
patent: 3742936 (1973-07-01), Blanie et al.
patent: 3835839 (1974-09-01), Brown
patent: 3835840 (1974-09-01), Mount
patent: 3847142 (1974-11-01), Williams, Jr. et al.
patent: 3871359 (1975-03-01), Pacela
patent: 3874368 (1975-04-01), Asrican
patent: 3882851 (1975-05-01), Sigworth
patent: 3976052 (1976-08-01), Junginger et al.
patent: 3994284 (1976-11-01), Voelker
patent: 3996925 (1976-12-01), Djordjevich
patent: 4204545 (1980-05-01), Yamakoshi
patent: 4205688 (1980-06-01), Hauser et al.
patent: 4258720 (1981-03-01), Flowers
patent: 4305400 (1981-12-01), Logan
patent: 4422458 (1983-12-01), Kravath
patent: 4432374 (1984-02-01), Osanai
patent: 4437469 (1984-03-01), Djordjevich
patent: 4450527 (1984-05-01), Sramek
patent: 4548211 (1985-10-01), Marks
patent: 4562843 (1986-01-01), Djordjevich
patent: 4641260 (1987-02-01), Fukukita et al.
patent: 4649932 (1987-03-01), Smith
patent: 4676253 (1987-06-01), Newman et al.
patent: 4733670 (1988-03-01), Hays et al.
patent: 4757824 (1988-07-01), Chaumet
patent: 4805621 (1989-02-01), Heinze et al.
patent: 4807638 (1989-02-01), Sramek
patent: 4823797 (1989-04-01), Heinze et al.
patent: 4836214 (1989-06-01), Sramek
patent: 4870578 (1989-09-01), Vysin et al.
patent: 4905705 (1990-03-01), Kizakevich et al.
patent: 4979110 (1990-12-01), Albrecht et al.
patent: 5025784 (1991-06-01), Shao et al.
patent: 5046504 (1991-09-01), Albert et al.
patent: 5101828 (1992-04-01), Welkowitz et al.
patent: 5103828 (1992-04-01), Sramek
patent: 5109862 (1992-05-01), Kelen et al.
patent: 5178151 (1993-01-01), Sackner
patent: 5178154 (1993-01-01), Ackmann et al.
Photocopy of Article "Digital Enhancement of the Peripheral Admittance Plethysmogram", L. A. Marks, IEEE Transactions on Biomedical Engineering, vol. BME-34, No. 3, Mar. 1987 (7 pages).
Photocopy of Instruction Manual, "Minnesota Impedance Cardiograph-A Noninvasive System to Monitor Cardiovascular Parameters", 4 sheets, Surcom, Inc., 4180 Edmund Boulevard, Minneapolis, Minn. 55406.
Photocopy of article "Mapping the cardiogenic impedance signal on the thoracic surface", R. P. Patterson et al., Medical & Biological Engineering & Computing, May 1990, 5 pages (beginning with p. 212).
Kizakevich et al, "Continuous Noninvasive Cardiac Monitoring etc.", Proc. Symp. on Computers In App. Med. Care, 1977 pp. 325-336.
Kizakevich et al, "An Automated System for Systolic Time Interval Analysis", Proc. Dig. Eq. Comp. Users Soc., 1976, pp. 795-798.
Gollan et al, "Continuous Electrode Monitoring etc.", British Heart Journal, 1978, pp. 1390-1396.
Geddes, "The Measurement of Cardiac Output and Blood Flow", from Cardiovascular Devices and Their Applications, pp. 100-135.
Miyamoto et al, "Continuous Determination of Cardiac Output, etc.", Med. & Biol. Eng. & Computing, 1981, pp. 638-644.
Miyamoto et al, "Automatic Determination of Cardiac Output, etc." Proc. 5th Int'l Conf. on Electr. Bio-Impedance, 1981, pp. 45-48.
Miyamoto et al, "Automatic Determination of Cardiac Output, etc." Biotelemetry Patient Monitoring, 1981, pp. 189-203.
Sramek et al., "Stroke Volume Equation etc.", Proc. 6th Int'l Conf. on Electr. Bioimpedance, 1983, pp. 1-2.
Sramek, "Noninvasive Technique for Meas. of Cardiac Output, etc." Proc. 5th Int'l Conf. on Electr. Bioimpedance, 1981, pp. 39-42.
Kubicek et al, "Development and Evaluation of an Impedance Cardiac Output System", Aerospace Medicine, 1966, pp. 1208-1212.
Kubicek et al, "The Minnesota Impedance Cardiogaph-Theory and Applications", Biomed. Eng. 1974, pp. 410-416.
Sun Hun H.
Wang Xiang
Drexel University
Jastrzab J.
Jaworski Francis
LandOfFree
System and method of impedance cardiography and heartbeat determ does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method of impedance cardiography and heartbeat determ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method of impedance cardiography and heartbeat determ will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2408865