Wound drainage device
US4278089A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1978 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Nov 9, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M1/684
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for removing fluids from a wound includes a housing and a passive bellows inside the housing. The bellows can be collapsed and retained in a collapsed or activated state. Upon release from its activated state, the bellows is expanded so as to provide a substantially constant level of negative pressure whereupon fluids from a wound are automatically drawn into and collected within the bellows at a substantially constant rate of suction throughout the range of evacuation. Preferably the bellows is expanded by a constant force ribbon spring which provides a constant force of expansion. Additionally, the housing is preferably transparent with graduations etched thereon permitting the visible inspection and measurement of the fluids removed from the wound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.