Calfee, Halter & Griswold LLP
Rigid clampable cannula
 A clampable conduit comprising a generally rigid layer having a first end and a generally flexible tube generally coaxial with the rigid layer. The flexible tube extends axially in a first direction beyond the first end. The conduit also has a generally rigid sleeve moveable between a cover position, wherein the sleeve covers a first part of the flexible tube, and an uncovered position, wherein the sleeve does not cover the first part of a flexible tube to enable clamping of the conduit. 
The Cleveland Clinic Foundation
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Ji-Feng
Chen