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US 5,688,246 AGranted
Microcannula
AssigneeBioTime, Inc.
InventorsHarold D. Waitz, Hal Sternberg, Paul E. Segall, Bruce Cohen
Life of this patent
Estimating the term…
Abstract
A microcannula suitable for cannulation of very small blood vessels in a small animal, neonate or adult having a sharp pointed trochar tightly but removable placed in the lumen of the microcannula. The trochar is held in place by contact friction from an area of reduced inside diameter distal to the tip end, formed by welding the end distal of the microcannula to a tube having a slightly larger diameter. A process for making a microcannula.
Claims12
A microcannula, comprising:
- a first hollow tube having a beveled tip;
- wherein said tube has a segment distal to the tip having an expanded outside diameter;
- a second hollow tube joined to said first hollow tube at a point distal to the tip of said first tube;
- an area of reduced inside diameter at said point of joinder;
- and
- a solid conically pointed trochar tightly but removably fitted in the lumen of said first tube, said trochar sufficiently long to protrude beyond the leading edge of said beveled tip, wherein said trochar is removably immobilized by friction contact provided at said area of reduced inside diameter.
3 more elements
Dependencies are inferred from the claim text.