Fluid conveyance safety devices, methods, and systems
AssigneeNxStage Medical, Inc.
InventorsJeffrey H. Burbank, Jamea M. Brugger, Joseph E. Turk
Life of this patent
Estimating the term…
Abstract
The disclosed subject matter includes a structure and method for making a dual-lumen needle from single lumen needles to take advantage of the much higher economies of scale. Variations include two needles joined by a flow junction and one needle and a single cannula joined by a flow junction. In addition disclosed are methods of using a dual-lumen needle in a two needle access for blood treatment is disclosed in which at least venous flow is provided through a dual-lumen needle with arterial flow just sufficient to provide air infiltration detection in the event of withdrawal of the dual-lumen needle.
Claims21
A method of manufacturing a dual-lumen needle, comprising:
- providing a first single lumen needle with a first metal cannula and a first plastic hub that supports the first metal cannula;
- providing a junction part of plastic having three cylindrical openings, first and second of the openings being coaxial and a third opening having an axis that crosses the common axis of the first two openings;
- providing a second metal cannula whose internal diameter is larger than an inner diameter of the first metal cannula;
- the first opening having an internal diameter approximately the same as an outer diameter of the second cannula;
- the second opening being sized and shaped to receive the first plastic hub;
- inserting the second cannula in the first opening;
- inserting the first plastic hub in the second opening including the first metal cannula with the common axis of the first and second openings;
- the inserting operations being performed including aligning the first and second metal cannulas coaxially;
- the junction part being configured such that the two inserting operations forms a fluid flow channel joining the third opening for fluid communication with an annular space coaxial with and lying between the first and second metal cannulas that is isolated from the second port.
7-8. (canceled)
A method of manufacturing a dual-lumen needle, comprising:
- providing a first single lumen needle with a first cannula and a first plastic hub that supports the first cannula;
- providing a junction part of plastic having three cylindrical openings, first and second of the openings being coaxial and a third opening having an axis that crosses the common axis of the first two openings;
- providing a second cannula whose internal diameter is larger than an inner diameter of the first cannula;
- the first opening having an internal diameter approximately the same as an outer diameter of the second cannula;
- the second opening being sized and shaped to receive the first plastic hub;
- inserting the second cannula in the first opening;
- inserting the first plastic hub in the second opening including the first cannula with the common axis of the first and second openings;
- the inserting operations being performed including aligning the first and second cannulas coaxially;
- the junction part being configured such that the two inserting operations forms a fluid flow channel joining the third opening for fluid communication with an annular space coaxial with and lying between the first and second cannulas that is isolated from the second port.
15-33. (canceled)
A method of manufacturing a dual-lumen needle, comprising:
- providing a first single lumen needle with a first cannula and a first hub that supports the first cannula;
- providing a junction part of having three cylindrical openings, first and second of the openings being coaxial and a third opening having an axis that crosses the common axis of the first two openings;
- providing a second cannula whose internal diameter is larger than an inner diameter of the first cannula;
- the first opening having an internal diameter approximately the same as an outer diameter of the second cannula;
- the second opening being sized and shaped to receive the first hub;
- inserting the second cannula in the first opening;
- inserting the first hub in the second opening including the first cannula with the common axis of the first and second openings;
- the inserting operations being performed including aligning the first and second cannulas coaxially and forming a seal that defines a channel between the third opening and an annular space between the first and second cannulas;
- the junction part being configured such that the two inserting operations forms a fluid flow channel joining the third opening for fluid communication with an annular space coaxial with and lying between the first and second cannulas that is isolated from the second port.
40-53. (canceled)
Dependencies are inferred from the claim text.