First method for using cannula including a valve structure and associated instrument element
US4844087A · kind A · utility
Inventor
Key dates
| Filing date | Jul 6, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jul 6, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/34
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
According to the present invention, an outer hollow cannula including a valve structure is adapted to receive inner instrument elements for performing the procedures of thoracentesis and plueral biopsy. The cannula comprises: a hollow cylindrical body including a longitudinally directed circular lumen; proximal attachment means; and the valve structure being interposed along the length of the cannula lumen. The valve structure includes a cylindrical member being interposed perpendicularly along the path of the cannula lumen, being rotatable about an axis perpendicular to the longitudinal direction of the cannula lumen, and further includes a short lumen having the same diameter as the cannula lumen and being rotatable to be concentric with the cannula lumen or being rotatable to be perpendicular to the cannula lumen. For performing the thoracentesis procedure, the cannula also comprises a distal circular annular surface. The cannula is adapted to receive an inner hollow needle instrument element including proximal attachment means, a location surface marker, and a distal slanted elliptical annular surface. For performing the pleural biopsy procedure, the cannula also comprises a di…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.