Devices and methods for delivering fluid to a nasal cavity
A delivery tube and cap are configured to be connected to a container that houses fluid to be delivered to a nasal cavity. The delivery tube includes an inner cannula that is positioned within an outer cannula. Each of the cannulas includes an outlet. The delivery tube and cap are configured to provide relative axial movement between the cannulas. The cannulas are positionable between a first axial position that aligns the outlets to deliver the fluid out of the device in a lateral direction and a second axial position that misaligns the outlets to impede the fluid from being delivered out of the device in the lateral direction.
1. A device to deliver fluid from a container, the device comprising:
a hollow inner cannula comprising:
an inlet at a proximal end of the inner cannula; and
a first outlet positioned towards a distal end of the inner cannula and in fluid-flow relationship with the inlet;
a hollow outer cannula that extends over and houses the inner cannula, the outer cannula comprising a second outlet that is:
exposed to an exterior of the device; and
towards a distal end of the outer cannula;
a cap in contact with the inner cannula and the outer cannula and configured to mate with the container, the cap comprising:
a first section; and
a second section configured to rotate relative to the first section such that relative axial movement of the inner and outer cannulas along a longitudinal axis of the inner and outer cannulas between a first axial position and a second axial position is provided;
wherein, in the first axial position, the first and second outlets are aligned thereby permitting the fluid to be ejected laterally out of the device from the second outlet via the first outlet relative to the second axial position;
wherein, in the second axial position, the first and second outlets are misaligned and the fluid is impeded from being ejected laterally out of the device from the second outlet via the first outlet relative to the first axial position.
2. The device of claim 1 , wherein:
the hollow inner cannula further comprises a third outlet in fluid-flow relationship with the inlet and positioned towards the distal end of the inner cannula on a different lateral section of the inner cannula from the first outlet;
the hollow outer cannula further comprises a fourth outlet that is exposed to an exterior of the device and is positioned towards the distal end of the outer cannula on a different lateral section of the outer cannula from the second outlet; and
wherein, in the first axial position, the third and fourth outlets are misaligned and the fluid is impeded from being ejected laterally out of the device from the fourth outlet via the third outlet relative to the second axial position;
wherein, in the second axial position, the third and fourth outlets are aligned thereby permitting the fluid to be ejected laterally out of the device from the fourth outlet via the third outlet relative to the first axial position.
3. The device of claim 2 , wherein:
the first outlet and the third outlet are spaced apart around a perimeter of the inner cannula by an angle of 90° or less; and
the second outlet and the fourth outlet are spaced apart around a perimeter of the outer cannula by an angle of 90° or less.
4. The device of claim 1 , wherein at least one of the cannulas comprises a stop that controls an extent of the relative axial movement.
5. The device of claim 1 , wherein the cap further comprises first and second ramps that engage with the outer cannula such that the rotation of the second section relative to the first section provides the relative axial movement of the inner and outer cannulas.
6. The device of claim 5 , wherein to engage with the outer cannula such that the rotation of the second section relative to the first section provides the relative axial movement of the inner and outer cannulas, the first and second ramps engage with fins that extend radially outward from the outer cannula.
7. The device of claim 1 , wherein to rotate relative to the first section, the second section is further configured to rotate:
in a clockwise direction to move the outer cannula axially relative to the inner cannula in a first direction; and
in a counter-clockwise direction to move the outer cannula axially relative to the inner cannula in a second direction opposite to the first direction.
8. The device of claim 1 , wherein the inner cannula is fixedly attached to the first section of the cap to prevent movement of the inner cannula during the relative axial movement of the inner and outer cannulas.
9. The device of claim 1 , wherein either or each of the first outlet and the second outlet comprises a plurality of openings.
10. The device of claim 9 , wherein:
each of the first outlet and the second outlet comprises the plurality of openings; and
the plurality of openings of the first outlet is common in number to the plurality of openings of the second outlet.
11. The device of claim 1 , further comprising an opening in the distal end of each of the inner and outer cannulas.
12. The device of claim 1 , wherein the outer cannula is curved.
13. The device of claim 1 , wherein the cap is further configured to keep one of the cannulas stationary during the relative axial movement.
14. The device of claim 13 , wherein the one of the cannulas kept stationary during the relative axial movement is threaded onto a threaded portion of the cap.
15. The device of claim 1 , wherein the first section comprises an first opening that is coaxially aligned with a second opening comprised in the second section.
16. A method of delivering fluid from a container, the method comprising:
rotating a first section of a cap in a first rotational direction relative to a second section of the cap, with a delivery tube comprising an inner cannula and an outer cannula that are each in contact with the cap, to cause movement of the outer cannula relative to the inner cannula in a first axial direction such that a first outlet on the inner cannula and a second outlet on the outer cannula are moved from misalignment into alignment, the first and second outlets being positioned towards distal ends of the inner and outer cannulas, wherein rotating in the first rotational direction comprises rotating until a stop comprised in at least one of the cannulas controls an extent of the movement;
inserting the delivery tube into a nasal cavity;
moving the fluid from the container into a proximal end of the inner cannula at the first and second sections of the cap and along the inner cannula; and
expelling the fluid through the aligned first and second outlets and onto a surface of the nasal cavity.
17. The method of claim 16 , further comprising:
removing the delivery tube from the nasal cavity;
rotating the first section of the cap in a second rotational direction relative to the second section of the cap, the second rotational direction being opposite to the first rotational direction, to cause movement of the outer cannula relative to the inner cannula in a second axial direction such that a third outlet on the inner cannula and a fourth outlet on the outer cannula are moved from misalignment into alignment, the third and fourth outlets being positioned towards distal ends of the inner and outer cannulas;
inserting the delivery tube into a different nasal cavity; and
expelling the fluid through the aligned third and fourth outlets and onto a surface of the different nasal cavity.
18. The method of claim 17 , wherein rotating in the second rotational direction further causes movement of the first and second outlets from alignment into misalignment.