Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1988-05-31
1992-03-24
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604164, 604166, 604172, A61M 518
Patent
active
050983938
ABSTRACT:
A medical catheter introducer and hemostasis valve assembly consists of a sheath having an elongated tube defining a conduit, a housing disposed at the proximal end of the sheath and further defining a conduit and an orifice, and a flexible elongated dilator sized for insertion through the hub and sheath conduit. The dilator has a tapered distal tip end and defines an axial conduit and an annular ridge having distally- and proximally-directed inclined surfaces. The sheath, when assembled with the dilator, has its distal end immediately adjacent the proximally-directed inclined surface of the ridge. A hemostasis valve for sealing the conduit is disposed in alignment with the conduit, and defines an aperture for passage of dilator and ridge therethrough in sealing engagement, into the conduit, and seals when the dilator is removed. The valve has a housing defining an orifice of a first diameter, and a valve element of a second diameter, greater than the first diameter. The valve is disposed within the orifice and is subject to externally-applied, radially directed forces that cause the valve to assume a dome-shape formation, with a convex surface disposed against the pressure of fluids within the body. As the introducer assembly is introduced into a body over a guidewire extending via a puncture opening into a vessel, the dilator and sheath flex to follow the guidewire, and the tapered end of the dilator and the distally-directed inclined surface of the ridge act to dilate the flesh about the opening to facilitate passage of the sheath. The introducer and valve may be used alone, or respectively with valves or introducers of other design. A base for attachment of the introducer to the patient is also described.
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Amplatz Kurt
Kotula Frank
Gutowski A.
Yasko John D.
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