Cannula provided with a sealing element for use in a medical procedure
AssigneeC. R. Bard, Inc.
InventorsNorbert Heske, Thomas Heske
Life of this patent
Estimating the term…
Abstract
A cannula arrangement includes an outer tube and an inner tube. The outer tube has a proximal end and a distal end. The inner tube is disposed within the outer tube to define a space between an inner surface of the outer tube and an outer surface of the inner tube. A sealing element is mounted at the proximal end of the outer tube. The sealing element has a projecting portion that projects proximally from the proximal end of the outer tube. The projecting portion has a projecting end that has an interior edge to contact the outer surface of the inner tube.
Claims17
A cannula arrangement, comprising:
- an outer tube having a proximal end and a distal end;
- an inner tube disposed within the outer tube to define a space between an inner surface of the outer tube and an outer surface of the inner tube;
- and
- a sealing element mounted at the proximal end of the outer tube, the sealing element having a projecting portion that projects proximally from the proximal end of the outer tube, the projecting portion having a projecting end that has an interior edge to contact the outer surface of the inner tube.
A cannula, comprising:
- a tube having a proximal end and a distal end;
- and
- a sealing element mounted at the proximal end of the tube, the sealing element having a projecting portion that projects proximally from the proximal end of the tube, the projecting portion having a projecting end that is curved inwardly and has an interior sealing edge.
A method of venting a cannula, comprising:
- forming a seal with a sealing element projecting from a proximal end of an outer tube so that an edge of the sealing element is flexibly pressing against an outer surface of an inner tube slidably disposed within the outer tube to form the seal, the seal resisting a distal movement of a fluid into a space defined by an inner surface of the outer tube and the outer surface of the inner tube;
- and
- moving the edge at least in part away from the outer surface of the inner tube to break the seal and allow the passage of a proximally-moving fluid from the space.
A medical device, comprising:
- a coaxial cannula for use in tissue, the coaxial cannula having an interior wall;
- a biopsy needle unit configured for insertion into the coaxial cannula, the biopsy needle unit having an exterior surface, and when inserted into the coaxial cannula an intermediate space is formed between the interior wall of the coaxial cannula and the exterior surface of the biopsy needle unit;
- and
- an elastic sealing element defining a sealing lip, the sealing lip having an interior edge, the elastic sealing element being mounted to the coaxial cannula, wherein the interior edge of the sealing lip is located to seal against the exterior surface of the biopsy needle unit.
Dependencies are inferred from the claim text.