Cannula including a valve structure and associated instrument el

Details Cannula including a valve structure and associated instrument el Cannula including a valve structure and associated instrument el

1988-07-06

1989-05-23

Coven, Edward M.

Surgery

Truss

Pad

128754, 604169, A61B 1000

Patent

active

048320447

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 distal tapered circular sharp edge. The cannula is adapted to receive an inner solid stylet instrument element and an inner hollow cutting needle instrument element. The stylet includes proximal attachment means, a location surface marker, and a distal symmetrical tapered pointed edge. The cutting needle includes: proximal attachment means, a proximal location surface marker, a distal location surface marker, distal sharp edge cutting means, and a distal circular annular surface.

REFERENCES:
patent: 1086873 (1914-02-01), Tyrrell
patent: 1740174 (1929-12-01), Hevern
patent: 2482622 (1949-09-01), Kahn
patent: 3434691 (1969-03-01), Hamilton
patent: 3777737 (1973-12-01), Bucalo
patent: 3783900 (1974-01-01), Walbillig
patent: 3957052 (1976-05-01), Topham
patent: 4051852 (1977-10-01), Villari
patent: 4187849 (1980-02-01), Stim

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