Surgery – Truss – Pad
Patent
1993-10-08
1995-10-03
Cohen, Lee S.
Surgery
Truss
Pad
A61B 505
Patent
active
054543770
ABSTRACT:
A method for measuring the complex impedance spectrum of a portion of the myocardium by placing two electrodes on a portion of the myocardium and applying a current pulse to the electrodes to generate a voltage response between the electrodes. Both the current pulse and voltage response are sampled and digitized and then a Fast fourier transform is taken of both the current pulse and the voltage response to obtain a complex current pulse spectrum and a complex voltage response spectrum. Next, the complex voltage response spectrum is divided by the complex current pulse spectrum to obtain the complex impedance spectrum.
REFERENCES:
patent: 4805621 (1989-02-01), Heinze et al.
patent: 4823797 (1989-04-01), Heinze et al.
patent: 4870967 (1989-10-01), Hanze et al.
patent: 4899750 (1990-02-01), Ekwall
patent: 5051352 (1991-09-01), Martindale et al.
patent: 5203344 (1993-04-01), Scheltinga et al.
Ozwonczyk et al., "A New Apparatus and Method for Measuring the Myocardial Electrical Impedance Spectrum," OSU Hospitals.
Garrido et al., "Bioelectrical Tissue Resistance During Various Methods of Myocardial Preservation", Ann Thorac Surg. vol. 36, No. 2, Aug. 1983, pp. 143-151.
Ellenby et al., "On-line Detection of Reversible Myocardial Ischemic Injury by Measurement of Myocardial Electrical Impedance", Ann Thorac Surg, vol. 44, No. 6, Dec. 1987, pp. 587-597.
Geddes et al., Principles of Applied Biomedical Instrumentation, John Wiley & Sons, New York, 1989, Chap. 11, "Detection of Physio-logical Events by Impedance", pp. 537-545.
Dzwonczyk et al., "A New Apparatus and Method for Measuring the Myocardial Electrical Impdance Specturm", 1992 Computers in Cardiology, 1992, p. 162.
Yun et al., "Alterations in Left Ventricular Diastolic Twist Mechanics During Acute Human Cardiac Allograft Rejection", Circulation, vol. 83, No. 3, Mar. 1991, pp. 962-973.
Howie et al., "The Use of Myocardial Tissue Impedance to Determine Esmolol's Effectiveness to Protect Against Ischaemia", Anesthesiology vol. 75, No. 3A, Sept. 1991, pp. 104-A443.
Romanelli, et al., "Impedance as an Early Marker for Myocardial Ischemia", Anesthesiology, vol. 73, No. 3A, Sept. 1990, A482.
Howie et al., "The Effect of Isoproterenol on Myocardial Ischemia Using Impedance as an Indicator", Anesth Analg, vol. 72, 1991, S115.
Jones et al., "The Measurement of the Conductance of Electrolytes I. An Experimental and Theoretical Study of Principles of Design of the Wheatstone Bridge for Use with Alternating Currents and an Improved Form of Direct Reading Alternating Current Bridge", J. Am. Chem. Soc. vol. 50, Apr. 1928, pp. 1049-1092.
Dzwonczyk Roger R.
Hartzler Alan W.
Liu Alan Y.
Cohen Lee S.
Foster Frank H.
Nassol, Jr. Robert L.
The Ohio State University
LandOfFree
Method for measuring the myocardial electrical impedance spectru does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for measuring the myocardial electrical impedance spectru, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for measuring the myocardial electrical impedance spectru will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1072370