Differential stethoscope
US4438772A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | Apr 8, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B7/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A portable differential stethoscope includes small microphone elements which are attached to the stethoscope heads to pick up acoustic signals from the body. The sounds picked up by the stethoscope heads include body noise signals as well as heartbeat signals. Each stethoscope head and microphone element provides an output which is amplified in an individual amplifier. The two amplified signals are inputted to separate terminals of a differential amplifier through a gain and balance control element. The differential amplifier outputs a difference signal which is amplified and inputted to an electrical headset or an electrical earphone element which is acoustically coupled to the conventional acoustic tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.