| 摘要 |
A receiver structure of stethoscope which can be switched back and forth between high- and low-frequency sound comprises a receiver body, a double-hoop frame, and a membrane, in which a groove is formed in an outer periphery of a sound-pickup cambered surface of the receiver body for buttoning up and assembling the double-hoop frame. The double-hoop frame further comprises an outer hoop and an inner hoop, which are supported by at least two links; and a gap is formed between the outer hoop and at least two links for clamping and fixing the rim of the membrane. When using a stethoscope of this kind, a large cavity would be formed and enclosed by the cambered surface, the outer hoop, and the membrane to enable a user to hear low-frequency sound via a pickup duct; or, a small cavity would be formed when the user depresses the receiver body harder to enable the user to hear high-frequency sound.
|
