Stethoscope with high frequency filter
US4633971A · kind A · utility
15Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 6, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Nov 6, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B7/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A low-pass filter is incorporated into the binaural tube of a stethoscope to selectively attenuate high frequency noise. The filter includes a small diameter inertance tube communicating with a large volume compliance chamber and is preferably located as far as possible from the chestpiece of the stethoscope to filter noise not only transmitted from the chestpiece, but also transmitted directly to the binaural tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.