Aspiration needle apparatus incorporating its own vacuum and method and adapter for use therewith
US5746724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Apr 12, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B10/0283
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An aspiration needle apparatus for collecting cell samples from tissue comprising a vacuum container having an enclosed evacuated space evacuated to a subambient pressure and sealed by a penetrable diaphragm. An adapter is provided having a recess which is adapted to receive the vacuum container. A needle assembly is carried by the adapter and has a distal extremity serving as an aspiration needle to collect the cell sample. The proximal extremity of the needle assembly is disposed in said recess and is capable of penetrating the diaphragm of the vacuum container to couple the evacuated space to the flow passage of the needle assembly to supply a subambient pressure to the distal extremity of the needle assembly. An on-off mechanism is carried by the adapter and includes a member engaged by the vacuum container and mounted in the recess for axial movement in the recess. A coil spring is disposed within the recess and engages the member and yieldably urges the member and the vacuum container in a direction out of the recess. A detent assembly is secured to the member for sequentially retaining the member in a first forwardmost position and a second rearwardmost position. In the firs…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.