Dual acoustical passage stethoscope

Details Dual acoustical passage stethoscope Dual acoustical passage stethoscope

1995-03-10

1996-03-12

Dang, Khanh

Acoustics

Anatomic or prosthetic relation

Ear and mouth

181131, H04R 2500

Patent

active

054988411

ABSTRACT:
A stethoscope head having a first pair of acoustical passages in sound communication with a low frequency sound receiving bell and a second pair of acoustical passages in sound communication with a high frequency sound receiving diaphragm. A cylindrical valve plug having a third pair of acoustical passages is disposed within a cylindrical bore into which the first and second pairs of acoustical passages open. A pair of sound tubes are connected to the third acoustical passages within the cylindrical valve plug. The pair of sound tubes act as a lever to facilitate rotation of the cylindrical valve plug to acoustically connect the third acoustical passages with either the first or second pair of acoustical passages.

REFERENCES:
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patent: 3570625 (1971-03-01), Allen
patent: 3601218 (1971-08-01), Reynold, Jr.
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patent: 4212368 (1980-07-01), Allen
patent: 4569413 (1986-02-01), Allen
patent: 4776426 (1988-10-01), Kazama
patent: 4823906 (1989-04-01), Gabriel
patent: 4928786 (1990-05-01), Allen
patent: 4991686 (1991-02-01), Allen

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