Hemostatic valve with multi-layer valve structure

摘要

A hemostatic valve device for use in inserting an interventional device into a body lumen of patient is provided. The valve device includes a housing that defines a cavity between first and second end openings. A valve structure is disposed within the cavity, and defines a variable diameter channel for receiving the interventional device. The valve structure can include discrete layers of material, such as a sealing layer and a contractible layer such as a biaxial braided layer. The end of the valve structure is movable relative to the fixed end so that the longitudinal passageway of the valve structure varies in diameter and axial length to form a seal against an interventional device inserted within the passageway. An operable element is coupled to the movable end and is actuated by the end user to open and close the valve structure.

主权项

1. An introducer for use in inserting an interventional device into a body vessel of a patient, the introducer comprising:
a housing having a first end opening, a second end opening, and an interior surface defining a housing cavity between the first and second end openings; and a valve structure coupled within the housing cavity, the valve structure having an inner radial surface defining a tubular channel along a longitudinal axis with a sealing region at least partially between the first and second end openings, the valve structure movable between a first configuration and a second configuration, wherein in the first configuration the sealing region has a first diameter and the valve structure has a first axial length, and in the second configuration the sealing region has a second diameter less than the first diameter and the valve structure has a second axial length greater than the first axial length, wherein the valve structure further comprises a contractible structure and a sealing structure, the sealing structure disposed inside of the contractible structure, wherein the sealing structure is unattached to the contractible structure at least along the sealing region of the valve structure to permit independent expansion and contraction therebetween in response to movement of the valve structure between the first and second configurations.