Surgery – Truss – Pad
Patent
1980-11-26
1982-10-26
Kamm, William E.
Surgery
Truss
Pad
128419D, A61N 104
Patent
active
043556469
ABSTRACT:
A lead having multiple electrodes which is transvenously implanted for use in standby defibrillation of patients having a high risk of ventricular fibrillation. The lead employs four electrodes. The two distal electrodes have a spacing for optimal measurement of impedance changes due to mechanical contractions. This impedance measurement is used for mechanical sensing of normal cardiac activity. The electrode at the very distal tip terminates in a hemispherical shape. Two proximal electrodes are closely spaced and located at a distance from the two distal electrodes which ensures their placement within the superior vena cava whenever the distal electrodes are placed within the right ventricular apex. The body of the lead uses drawn brazed strand conductors wound triaxially for maximum flexibility, minimum cross-sectional area and the required high current carrying capability. At the proximal end of the lead, three connectors are used to electrically couple the lead to an implantable pulse generator. The two distal electrodes are electrically separated and each terminates in a separate proximal connector. The two proximal electrodes are electrically coupled to a single proximal connector. A stylet is employed to aid in implantation.
REFERENCES:
patent: 3333045 (1967-07-01), Fisher et al.
patent: 3416533 (1968-12-01), Fisher et al.
patent: 3572344 (1971-03-01), Bolduc
patent: 3857398 (1974-12-01), Rubin
patent: 3942536 (1976-03-01), Mirowski et al.
patent: 4033357 (1977-07-01), Helland et al.
"Optimal Spacing of Right Ventricular Bipolar Catheter Electrodes for Detecting Cardiac Pumping by an Automatic Implantable Defibrillator", by W. A. Tacker, Jr., et al., Medical Instrumentation, vol. 14, No. 1, Jan.-Feb. 1980.
Medtronic.RTM. Transvenous, Tined, Ventricular Leads Models 6971 and 6972 -Jul. 1979.
Doring John D.
Kallok Michael J.
Beck Robert C.
Breimayer Joseph F.
Kamm William E.
Medtronic Inc.
Rooney John L.
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