Patent ID: 7681576
Filing Date: 2010-03-23
Classification: A61M,Y10T

Abstract:
1. A multiple cannula assembly for insertion into a patient, comprising: a) a flexible outer cannula having a head including a connector and at least one ridge and at least one stop portion, said outer cannula having a substantially rigid tip including a stepped portion configured to reduce an outward bulge of a cuff; b) a flexible inner cannula having a hub including at least one protrusion engageable with said at least one ridge of said outer cannula head; c) said inner cannula being longitudinally insertable into said outer cannula to an insertion position in which said inner cannula hub is positioned at least partially within said outer cannula head; and d) said inner cannula hub being rotatable relative to said outer cannula head in a locking direction from said insertion position to a locked position in which said at least one protrusion of said hub is engaged with said at least one ridge of said head, said at least one stop portion inhibiting rotation of said inner cannula hub in said locking direction beyond said locked position of said inner cannula hub.