Chainsaw

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The origin of chain saws in surgery is debated. A "flexible saw", consisting of a fine serrated link chain held between two wooden handles, was pioneered in the late 18th century (c. 1783–1785) by two Scottish doctors, John Aitken and James Jeffray, for symphysiotomy and excision of diseased bone, respectively. It was illustrated in the second edition of Aitken's Principles of Midwifery, or Puerperal Medicine (1785) in the context of a pelviotomy. Jeffray claimed to have conceived the idea of the chain saw independently about that time, but he was not able to have it produced until 1790. In 1806, Jeffray published "Cases of the Excision of Carious Joints by H. Park and P. F. Moreau, with Observations by James Jeffray, M. D. " In this communication, he translated Moreau's paper of 1803. Park and Moreau described successful excision of diseased joints, particularly the knee and elbow. Jeffray explained that the chain saw would allow a smaller wound and protect the adjacent neurovascular bundle. Symphysiotomy had too many complications for most obstetricians, but Jeffray's ideas became accepted, especially after the development of anesthetics. Mechanized versions of the chain saw were developed but in the later 19th century, it was superseded in surgery by the Gigli twisted-wire saw. For much of the 19th century, however, the chain saw was a useful surgical instrument.

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Poulan Pro 18" 42CC 2 Cycle Gas Chainsaw | PP4218A-BRC ...
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CPSC, Stihl Inc. Announce Recall of Chain Saws | CPSC.gov
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Poulan Pro 18" Bar 42CC 2 Cycle Gas Powered Chainsaw ...
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China Chainsaw (HL-CG6200) - China Chain Saw, Power Chain Saw
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Remington 51-cc 2-cycle 18-in Gas Chainsaw with Case at ...
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