Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2001-11-09
2003-11-25
Casler, Brian L. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S525000, C604S524000
Reexamination Certificate
active
06652508
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to catheters. More specifically, the present invention relates to intravascular microcatheters.
BACKGROUND OF THE INVENTION
Intravascular catheters are used to diagnose and treat a wide variety of vascular diseases in various parts of the human vasculature. To access the cerebral vasculature, as well as other remote and tortuous vascular sites, it is desirable to have a catheter that has good navigational capabilities.
SUMMARY OF THE INVENTION
To address this need, the present invention provides, in one example, an intravascular microcatheter having a relatively stiff proximal shaft (e.g., super elastic hypotube) for pushability and torqueability. The microcatheter also includes a relatively flexible distal shaft portion (e.g., coil reinforced multi-layered gradient polymer tube) for trackability. To provide a smooth transition between the relatively stiff proximal shaft and the relatively flexible distal shaft, a transition region is provided by integrating portions of the proximal shaft and portions of the distal shaft in a manner that provides a secure connection and that minimizes profile increase. The result is a low profile microcatheter having superior response and control to navigate through tortuous vasculature to remote vascular sites.
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Griffin Stephen
Mirigian Greg
Ye Tina
Casler Brian L.
Crompton Seager & Tufte LLC
Rodriguez Cris L.
Sci-Med Life Systems, Inc.
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