Surgery – Truss – Pad
Patent
1990-04-10
1992-03-24
Cohen, Lee S.
Surgery
Truss
Pad
128419P, A61N 105
Patent
active
050978438
ABSTRACT:
A porous electrode for pacemakers is comprised of a plurality of platinum globules sintered together to form a porous mass of semi-hemispherical shape at the end of a platinum electrode stem. The globules, which are themselves made by sintering together spherically-shaped particles of approximately one micron diameter, provide the globules with an irregular outer surface of high total surface area. The globules have diameters within a critical range of 40-200 microns. The large total surface area of the globules improves the sensing function of an electrode configuration of given size and surface area, while the globule diameters of 40-200 microns have been found to beneficially accommodate tissue ingrowth within the electrode. In a preferred method of making the electrode, the platinum globules, which are formed by sintering together platinum particles of much smaller size, are mixed with organic solvent and organic binder to form a paste. After application of the paste to the base of an electrode stem and pressing of the paste using a mold so as to form the paste into the desired semi-hemispherical shape, the electrode is heated to evaporate the organic solvent, and the electrode is then placed in a sintering furnace to sinter together the platinum globules and form the completed electrode.
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Ripart et al., "Electrode-Heart Interface: Definition of the Ideal Electrode," PACE, vol. 8 (Mar.-Apr. 1983, Part II), pp. 410-421.
Bobyn et al., "Effect of Pore Size on the Peel Strength of Attachment of Fibrous Tissue to Porous-Surfaced Implants," Journal of Biomedical Materials Research, vol. 16 (1982), pp. 571-584.
Kreyenhagen Paul E.
Soukup Thomas M.
Cohen Lee S.
Romano Malcolm J.
Siemens-Pacesetter, Inc.
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