Surgery – Truss – Pad
Patent
1996-09-17
1998-01-20
Kamm, William E.
Surgery
Truss
Pad
128902, A61B 50428
Patent
active
057092133
ABSTRACT:
Disclosed are a method of and apparatus for deriving augmented lead electrocardiograph (ECG) signals from electrical signals sensed at three skin surface, limb electrodes attached to a patient's limbs without the use of a high impedance resistor network. First, second and third pairs of the three limb electrodes are combined to provide first, second and third positive and negative limb lead signal pairs. The first, second and third positive and negative limb lead signal pairs are combined and amplified to provide first, second, and third limb lead signals (LI, LII and LIII). The first, second and third amplified lead limb signals LI, LII and LIII are combined into augmented lead signals aVR, aVL, aVF through a low impedance resistor network and operational amplifiers, in accordance with the formulas: aVR=-0.5 (LI+LII), aVL=0.5 (LI-LIII), and aVF=0.5 (LII+LIII).
REFERENCES:
patent: 5331966 (1994-07-01), Bennet et al.
patent: 5377687 (1995-01-01), Evans et al.
patent: 5379775 (1995-01-01), Kruse
patent: 5435316 (1995-07-01), Kruse
patent: 5448997 (1995-09-01), Kruse et al.
M. Simson, The Role of Signal Averaged Electrocardiography in Identifying at High Risk for Lethal Ventricular Tacharrhythmias, PACE, vol. 14, May 1991, Part ll, pp. 944-950.
Jurek Dave R.
Kruse John M.
Kamm William E.
Medtronic Inc.
Patton Harold R.
Woods Thomas F.
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