Instillation cartridge for vacuum actuated fluid delivery
A fluid delivery system, method, and apparatus for providing instillation therapy with a negative-pressure source is described. The apparatus includes a housing having an ambient chamber and a negative-pressure chamber fluidly isolated from each other. The apparatus also includes a moveable barrier disposed in the housing between the ambient chamber and the negative-pressure chamber. The moveable barrier is operable to move between a charge position and a discharge position in response to negative pressure. A fluid source is disposed in the negative-pressure chamber and is collapsible in response to movement of the moveable barrier to the discharge position. The apparatus also includes a fluid outlet in fluid communication with the fluid source, a negative-pressure port in fluid communication with the negative-pressure chamber and configured to be coupled to a negative-pressure source, and a vent formed in the housing and fluidly coupled to the ambient chamber.
1. A fluid delivery apparatus for providing instillation therapy with a negative-pressure source, the apparatus comprising:
a housing having an ambient chamber and a negative-pressure chamber fluidly isolated from each other;
a moveable barrier disposed in the housing between the ambient chamber and the negative-pressure chamber, the moveable barrier operable to move between a charge position and a discharge position in response to negative pressure;
a fluid source disposed in the negative-pressure chamber, the fluid source being collapsible in response to movement of the moveable barrier to the discharge position;
a fluid outlet in fluid communication with the fluid source;
a negative-pressure port in fluid communication with the negative-pressure chamber and configured to be coupled to a negative-pressure source; and
a vent formed in the housing and fluidly coupled to the ambient chamber.
2. The apparatus of claim 1 , wherein the moveable barrier comprises a diaphragm.
3. The apparatus of claim 1 , wherein the moveable barrier comprises a piston.
4. The apparatus of claim 1 , further comprising a calibrated orifice disposed in the fluid outlet.
5. The apparatus of claim 1 , further comprising an occluder in fluid communication with the fluid outlet.
6. The apparatus of claim 1 , further comprising:
a calibrated orifice disposed in the fluid outlet; and
an occluder in fluid communication with the fluid outlet.
7. The apparatus of claim 1 , further comprising a pressure sensing port fluidly coupled to the negative-pressure chamber.
8. The apparatus of claim 1 , further comprising:
a calibrated orifice disposed in the fluid outlet;
an occluder in fluid communication with the fluid outlet; and
a pressure sensing port fluidly coupled to the negative-pressure chamber.
9. A system for providing instillation therapy, the system comprising:
a negative-pressure source;
a cartridge coupled to the negative-pressure source, the cartridge comprising:
a housing having an ambient chamber and a negative-pressure chamber fluidly isolated from each other;
a moveable barrier disposed in the housing between the ambient chamber and the negative-pressure chamber, the moveable barrier operable to move between a charge position and a discharge position in response to negative pressure;
a fluid source disposed in the negative-pressure chamber, the fluid source being collapsible in response to movement of the moveable barrier to the discharge position;
a fluid outlet in fluid communication with the fluid source;
a negative-pressure port in fluid communication with the negative-pressure chamber and configured to be coupled to the negative-pressure source; and
a vent formed in the housing and fluidly coupled to the ambient chamber.
10. The system of claim 9 , wherein the moveable barrier comprises a diaphragm.
11. The system of claim 9 , wherein the moveable barrier comprises a piston.
12. The system of claim 9 , further comprising a calibrated orifice disposed in the fluid outlet.
13. The system of claim 9 , further comprising an occluder in fluid communication with the fluid outlet.
14. The system of claim 9 , further comprising:
a calibrated orifice disposed in the fluid outlet; and
an occluder in fluid communication with the fluid outlet.
15. The system of claim 9 , further comprising a pressure sensing port fluidly coupled to the negative-pressure chamber.
16. The system of claim 9 , further comprising:
a calibrated orifice disposed in the fluid outlet;
an occluder in fluid communication with the fluid outlet; and
a pressure sensing port fluidly coupled to the negative-pressure chamber.
17. A method for providing instillation therapy with a negative-pressure source, the method comprising:
providing a negative-pressure source;
providing a cartridge comprising:
a housing having an ambient chamber and a negative-pressure chamber fluidly isolated from each other;
a barrier disposed in the housing between the ambient chamber and the negative-pressure chamber, the barrier operable to move between a charge position and a discharge position in response to negative pressure;
a fluid source disposed in the negative-pressure chamber, the fluid source being collapsible;
a fluid outlet in fluid communication with the fluid source;
a negative-pressure port in fluid communication with the negative-pressure chamber and configured to be coupled to the negative-pressure source; and
a vent formed in the housing and fluidly coupled to the ambient chamber;
fluidly coupling the negative-pressure source to the negative-pressure port; and
supplying negative-pressure to the negative-pressure chamber move the barrier against the fluid source.
18. The method of claim 17 , further comprising:
determining a volume of fluid flowing through the fluid outlet;
if the volume of fluid equals a therapeutic dosage, stopping the supply of negative pressure; and
venting the negative-pressure chamber to an ambient environment.
19. The method of claim 17 , wherein the cartridge further comprises a calibrated orifice disposed in the fluid outlet, the method further comprising:
determining a level of negative pressure in the negative pressure chamber;
calculating a flow rate through the fluid outlet based on the level of negative-pressure in the negative-pressure chamber and a diameter of the calibrated orifice; and
maintaining the level of negative pressure in the negative-pressure chamber to maintain the flow rate until a therapeutic volume of fluid is provided through the fluid outlet.
20. The method of claim 17 , wherein the barrier comprises a diaphragm.
21. The method of claim 17 , wherein the barrier comprises a piston.
22. The method of claim 17 , further comprising an occluder in fluid communication with the fluid outlet.
23. The method of claim 17 , further comprising:
a calibrated orifice disposed in the fluid outlet; and
an occluder in fluid communication with the fluid outlet.
24. The method of claim 17 , further comprising a pressure sensing port fluidly coupled to the negative-pressure chamber.
25. The method of claim 17 , further comprising:
a calibrated orifice disposed in the fluid outlet;
an occluder in fluid communication with the fluid outlet; and
a pressure sensing port fluidly coupled to the negative-pressure chamber.
26. An apparatus for providing negative-pressure therapy and instillation therapy, the apparatus comprising:
a negative-pressure source;
a cartridge having an ambient chamber, a negative-pressure chamber, and a fluid source disposed in the negative-pressure chamber; and
a controller configured to:
determine a level of negative pressure provided by the negative-pressure source,
calculate an amount of fluid instilled in response to the level of negative pressure,
maintain the level of negative pressure if the amount of fluid instilled is less than a therapeutic dose, and
stop supplying negative pressure with the negative-pressure source if the amount of fluid instilled is equal to or greater than a therapeutic dose.