Cannula device for high flow therapy
A nasal cannula is described herein for respiratory therapy which includes a first gas supply tub with a distal end terminating in a first connector, and a nasal cannula body which includes a first end rotatably coupled to the first connector, a second end opposite the first end, a longitudinal axis extending from the first end to the second end, and a first nasal prong in fluid communication with the first gas supply tube. The first nasal prong is rotatable relative to the first gas supply tube about the longitudinal axis of the nasal cannula body.
1. A nasal cannula for respiratory therapy, the cannula comprising:
a first gas supply tube having a distal end that terminates in a first connector;
a second gas supply tube having a distal end that terminates in a second connector;
a nasal cannula body comprising:
a first end coupled to the first connector,
a second end, opposite the first end,
a longitudinal axis extending from the first end to the second end,
a first nasal prong in fluid communication with the first gas supply tube;
a second nasal prong;
a first section and a second section, the first section and the second section disposed adjacently along the longitudinal axis of the nasal cannula body, the first nasal prong disposed on the first section and the second nasal prong disposed on the second section, the first section and the second section coupled by a journal bearing such that the first section is rotatable about the longitudinal axis of the nasal cannula body relative to the second section;
a first elastomeric loop having a first over ear connector detachably coupled to the first gas supply tube, the first over ear connector coupled non-fluidically to the first gas supply tube, wherein the first elastomeric loop is sized to hang over a first ear; and
a second elastomeric loop having a second over ear connector detachably coupled to the second gas supply tube, the second over ear connector coupled non-fluidically to the second gas supply tube, wherein the second elastomeric loop is sized to hang over a second ear.
2. The nasal cannula of claim 1 , wherein the first end of the nasal cannula body is rotatably coupled to the first connector, and
wherein the first nasal prong is rotatable relative to the first gas supply tube, the rotation being about the longitudinal axis of the nasal cannula body.
3. The nasal cannula of claim 2 , wherein the rotatable coupling between the first end of the nasal cannula body and the first connector is a journal bearing.
4. The nasal cannula of claim 3 , wherein the journal bearing has sufficient static frictional torque to maintain a rotational position of the first nasal prong relative to the first gas supply tube.
5. The nasal cannula of claim 4 , wherein the journal bearing has frictional torque of about 0.01 Nm to 1 Nm.
6. The nasal cannula of claim 3 , wherein the journal bearing has an internal surface contoured such that the journal bearing has intermittent rotational stops.
7. The nasal cannula of claim 2 , further comprising a lock configured to lock a rotational position of the first nasal prong relative to the first gas supply tube.
8. The nasal cannula of claim 1 , wherein the second nasal prong is rotatable relative to the first gas supply tube, the rotation being about the longitudinal axis of the nasal cannula body.
9. The nasal cannula of claim 1 , wherein the first nasal prong is rotatable relative to the second nasal prong about the longitudinal axis of the nasal cannula body.
10. The nasal cannula of claim 1 , wherein the second end of the nasal cannula body is rotatably coupled to the second connector, and wherein the second nasal prong is in fluid communication with the second gas supply tube.
11. The nasal cannula of claim 1 , wherein the first nasal prong is not in fluid communication with the second nasal prong.
12. The nasal cannula of claim 1 , wherein the first nasal prong and the second nasal prong are joined by a solid bridge connector.
13. The nasal cannula of claim 1 , wherein an axial distance between the first nasal prong and the second nasal prong along the longitudinal axis of the nasal cannula body is adjustable.
14. The nasal cannula of claim 13 , wherein the first nasal prong is axially slidable along the longitudinal axis of the nasal cannula body relative to the second nasal prong.
15. The nasal cannula of claim 14 , wherein the nasal cannula body includes a surface contoured to provide a discrete number of stable axial positions of the first nasal prong.
16. The nasal cannula of claim 1 , wherein the nasal cannula body is detachable from the first gas supply tube.
17. The nasal cannula of claim 1 , further comprising a gas source, wherein the gas source is configured to provide breathing gas at a flow rate of over 8 liters per minute (LPM).
18. The nasal cannula of claim 1 , wherein the first connector includes a first section sized to receive the first gas supply tube and a second section sized for insertion into the first end of the nasal cannula body, the first section coupled to the second section at a bearing, wherein the second section is configured to swivel relative to the first section.
19. The nasal cannula of claim 1 , wherein the first elastomeric loop is configured to be coupled to the first gas supply tube at a first coupler configured to be positioned at a bottom point of the first elastomeric loop; and
wherein the second elastomeric loop is configured to be coupled to the second gas supply tube at a second coupler configured to be positioned at a bottom point of the second elastomeric loop.
20. The nasal cannula of claim 19 , wherein the first coupler is configured as a column having openings at either end sized to fit an outer diameter of the first gas supply tube; and
wherein the second coupler is configured as a column having openings at either end sized to fit an outer diameter of the second gas supply tube.
21. The nasal cannula of claim 1 , wherein the first elastomeric loop and the second elastomeric loop each comprise a loop encasement covering the elastomeric loop and configured to be disposed between the elastomeric loop and the patient's ear.
22. The nasal cannula of claim 21 , wherein the loop encasement comprises a fluid-filled cushion or a foam.