Trocar-cannula device

Details Trocar-cannula device Trocar-cannula device

1996-11-20

1998-10-20

Buiz, Michael Powell

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604170, 604264, 606185, A61M 5178

Patent

active

058240020

ABSTRACT:
A trocar device, comprising a trocar cutting element, a surrounding insulating sheath, and a cannula surrounding the sheath, also includes an arrangement providing a substantially smooth transition between the sheath and cannula at the distal end of the cannula during the insertion of the trocar device into a patient so as to reduce drag on the device at the transition. In one embodiment, the sheath includes a shaped portion of enlarged diameter, and the cannula includes, at the distal end thereof, inwardly directed slits forming corresponding resilient leaf members which engage the shaped portion to provide the smooth transition. The shaped portion includes oppositely tapered surfaces meeting at a common apex. In another embodiment, an expandable section, when expanded, provides the smooth transition.

REFERENCES:
patent: 5263937 (1993-11-01), Shipp
patent: 5279575 (1994-01-01), Sugarbaker
patent: 5300070 (1994-04-01), Gentelia et al.
patent: 5350393 (1994-09-01), Yoon
patent: 5372588 (1994-12-01), Farley et al.
patent: 5575804 (1996-11-01), Yoon
patent: 5580344 (1996-12-01), Hasson

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