DescriptionCardiac pacer with sold-state power source.jpg
English: A medical device that generates electrical impulses delivered by electrodes to cause the heart muscle chambers (the upper, or atria and/or the lower, or ventricles) to contract and therefore pump blood; by doing so this device replaces and/or regulates the function of the electrical conduction system of the heart. Pacer designed by Anthony J. Adducci and Arthur Schwalm.
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Pacemaker photo: own. Illustration: The website of the United States Patent and Trademark Office states that "the text and drawings of a patent are typically not subject to copyright restrictions," and similar views have been published by patent attorneys.
The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)
The original patent contains no such notice, so its contents are in the public domain.
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