Manual negative pressure pump device
US6979184B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Dec 10, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61H2205/087
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A manual negative pressure pump device comprises a suction cylinder, a handle, a pull, a piston, and an expandable spring which forms a vacuum absorbing device. A front end of the suction cylinder is a thread post with outer thread. The thread post has a central through hole and a plurality of small air holes around the through hole. The thread post is screwed with a nut of a joint. A valve and a drain-proof ring are installed between the joint and the thread post. The valve is a rubber washer and two ends of the washer have respective pins. The two pins are inserted into a central through hole of the joint and the central through hole of the thread post. The central through holes of the joint and the thread post are retained with a predetermined distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.