Seal for variable compression interfaces
The disclosure is directed to an example of a device configured to be in fluid communication with an article. The device includes an element configured to contact the article to form a variable compression interface between the element and the article. The device also includes a seal disposed on the element and at the variable compression interface. The seal is configured to reduce an amount of unwanted fluid leakage at the variable compression interface. An example seal includes a filter media configured to trap unwanted particles attempting to pass through the variable compression interface. In one example, the variable compression interface can be included within a heat and moisture exchange (HME) unit.
1. A device configured to be in fluid communication with an article, the device comprising:
a housing having a first port, a second port, and an intermediate section; the intermediate section having a first flow path between the first port and the second port, and a second flow path between the first port and the second port, the first flow path separated from the second flow path by a heat and moisture retaining media,
the housing including a valve mechanism in the intermediate section, the valve mechanism comprising
an element forming an aperture having a radially extending ridge, and
an obstruction member, the obstruction member comprising an arm pivotably coupled to a base, the base having a first surface and an opposing second surface, the second surface of the base coupled to the heat and moisture retaining media, the arm having a first surface and an opposing second surface, the arm configured to contact the ridge at a first point of travel; and
a seal disposed on the first surface of the arm and the first surface of the base, the seal compressed between the ridge and the first surface of the arm at the first point of travel to form a variable compression interface so as to restrict fluid leakage across the variable compression interface between the arm and the ridge,
wherein the seal comprises a sheet or web of compressible filter media formed of non-woven material configured to (i) conform its shape under biasing forces at the variable compression interface; and (ii) trap particles, attempting to pass across the variable compression interface, in the non-woven material;
wherein the arm at the first point of travel directs the fluid through the first flow path, and a second point of travel directs the fluid through the second flow path.
2. The device of claim 1 wherein the filter media comprises polypropylene acrylic fibers.
3. The device of claim 2 wherein the filter media comprises an electrostatic charge.
4. The device of claim 1 wherein the article is a heat and moisture exchange unit element.
5. The device of claim 4 wherein the seal is disposed on the obstruction member and the element.
6. The device of claim 5 wherein the seal is affixed to the obstruction member with a medical-grade adhesive.
7. The device of claim 1 wherein the fluid is air.
8. A heat and moisture exchange unit comprising:
a housing having a first port, a second port, and an intermediate section; the intermediate section having a first flow path between the first port and the second port, and a second flow path between the first port and the second port, the first flow path separated from the second flow path by a heat and moisture retaining media, the housing including
a valve mechanism in the intermediate section, the valve mechanism comprising
an element forming an aperture having a radially extending ridge, and
an obstruction member, the obstruction member comprising an arm pivotably coupled to a base, the base having a first surface and an opposing second surface, the second surface of the base coupled to the heat and moisture retaining media, the arm having a first surface and an opposing second surface, the arm configured to contact the ridge at a first point of travel; and
a seal disposed on the first surface of the arm and the first surface of the base, the seal compressed between the ridge and the first surface of the arm at the first point of travel to form a variable compression interface so as to restrict fluid leakage across the variable compression interface between the arm and the ridge,
wherein the seal comprises a sheet or web of compressible filter media formed of non-woven material configured to (i) conform its shape under biasing forces at the variable compression interface; and (ii) trap particles, attempting to pass across the variable compression interface, in the non-woven material;
wherein the arm at the first point of travel directs the fluid through the first flow path, and a second point of travel directs the fluid through the second flow path.
9. The heat and moisture exchange unit of claim 8 wherein the heat and moisture retaining media includes a resilient foam treated with a hygroscopic salt.
10. The heat and moisture exchange unit of claim 9 wherein the heat and moisture retaining media includes a polyurethane foam treated with calcium chloride.
11. The heat and moisture exchange unit of claim 8 wherein the filter media includes non-woven fibers.
12. The heat and moisture exchange unit of claim 11 wherein the non-woven fibers include an electrostatic charge.
13. The heat and moisture exchange unit of claim 11 wherein the non-woven fibers include a polypropylene acrylic having an electrostatic charge.
14. The heat and moisture exchange unit of claim 11 where the fibers are bonded together into a sheet or web.
15. The heat and moisture exchange unit of claim 8 wherein the obstruction member is a gate valve.
16. The heat and moisture exchange unit of claim 8 wherein the obstruction member is biased against the element with a torsional spring.
17. A breathing circuit for use with a patient, the breathing circuit comprising:
a positive pressure fluid source;
a termination device configured to interface with the patient; and
a component fluidly coupling the positive pressure fluid source to the termination device, the component comprising:
a housing having a first port, a second port, and an intermediate section; the intermediate section having a first flow path between the first port and the second port, and a second flow path between the first port and the second port, the first flow path separated from the second flow path by a heat and moisture retaining media, the housing including
a valve mechanism in the intermediate section, the valve mechanism comprising
an element forming an aperture having a radially extending ridge, and
an obstruction member, the obstruction member comprising an arm pivotably coupled to a base, the base having a first surface and an opposing second surface, the second surface of the base coupled to the heat and moisture retaining media, the arm having a first surface and an opposing second surface, the arm configured to contact the ridge at a first point of travel; and
a seal disposed on the first surface of the arm and the first surface of the base, the seal compressed between the ridge and the first surface of the arm at the first point of travel to form a variable compression interface so as to restrict fluid leakage across the variable compression interface between the arm and the ridge,
wherein the seal comprises a sheet or web of compressible filter media formed of non-woven material configured to (i) conform its shape under biasing forces at the variable compression interface; and (ii) trap particles, attempting to pass across the variable compression interface, in the non-woven material;
wherein the arm at the first point of travel directs the fluid through the first flow path, and a second point of travel directs the fluid through the second flow path.
18. The breathing circuit of claim 17 wherein the positive pressure fluid source includes a ventilator.
19. The breathing circuit of claim 17 wherein the termination device includes a mask.