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This combined neurologic percussion hammer has primarily the great advantage of being so compact that it can be carried in a vest pocket, being about half the length of the ordinary type. When it is pulled out it is the size of the ordinary percussion hammer.
The design conforms to that of a Roman battle ax. The convex side is used for the ordinary elicitation of tendon reflexes incidental to a neurologic examination. Metal is used here as weight for the proper balance, and the crescent shaped insert of dark red rubber, as a soft cushion. The top white rubber tip can be used for eliciting tendon response (especially in children), muscle chest percussion, etc. The rubber is a little harder here and is kept in place by a setscrew.
The opposite end of the instrument, or the handle, is made of three narrow tubes, within each of which lies
Leiner JH. NEUROLOGIC PERCUSSION HAMMER. JAMA. 1922;78(6):429. doi:10.1001/jama.1922.26410590007013g
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