Automatic infusion valve
The present disclosure generally relates to fluid control valves for delivering and/or aspirating fluid during ophthalmic surgeries and procedures. In one embodiment, a valve assembly includes a first portion configured to fluidly couple with a gas supply line and a second portion configured to fluidly couple with a liquid supply line and an infusion line. The first portion and the second portion are partitioned or separated from each other by a filter having a hydrophobic membrane configured to prevent the flow of liquids therethrough while allowing the free flow of gas. Accordingly, an infusion liquid may be flown through the second portion while gases may be simultaneously aspirated through the first portion, without any liquids travelling into the gas supply line. The gas supply line may thus be utilized to vent or purge gases from the infusion line before or during performance of surgical procedures.
1. A valve assembly configured for bi-directional flow of gas and infusion liquid therethrough during ophthalmic procedures, comprising:
a first portion configured to allow a bidirectional flow of gas therethrough, comprising:
a first conduit having a first port configured to couple to a source of gas; and
a first cavity having a first end and a second end opposite the first end, the first end fluidly coupled to the first port via the first conduit, the second end having a cross-sectional area greater than a cross-sectional area of the first conduit;
a second portion configured to allow bi-directional flow of gas and infusion liquid therethrough, comprising:
a second conduit having a second port and a third port on an opposing side of the second conduit as the second port, wherein the second port, the second conduit, and the third port provide a first flow passageway through the second port, the second conduit, and the third port; and
a second cavity in fluid communication with the second port and the third port, the second cavity adjacent to the first cavity;
wherein the second port is configured to couple to a source of liquid and wherein the third port is configured to couple to an infusion line for an ophthalmic surgical site; and
a filter partitioning the first cavity from the second cavity, the filter comprising a hydrophobic membrane partially defining the second cavity along a planar face of the hydrophobic membrane;
wherein the first portion, the filter, and the second portion are configured to allow a flow of gas from the first port, through the first portion, through the filter, through the second portion, and out of the third port;
wherein the first portion, the filter, and the second portion are further configured to allow a flow of gas from the third port, through the second portion, through the filter, through the first portion, and out the first port; and
wherein the first portion, the filter, and the second portion are further configured to allow a flow of infusion liquid from the second port, through the second portion, and out the third port while further configured to provide vacuum from the first port to aspirate gas from the flow of infusion liquid in the second portion, such that the aspirated gas flows from the infusion liquid in the second portion, through the filter, through the first portion, and out the first port.
2. The valve assembly of claim 1 , wherein the hydrophobic membrane is configured to prevent a flow of liquid from the second cavity into the first cavity while allowing bi-directional flow of gas therebetween.
3. The valve assembly of claim 1 , wherein the hydrophobic membrane comprises at least one of polytetrafluoroethylene (PTFE), expanded PTFE (ePTFE), polycarbonate track etch (PCTE), polyester, nylon, cellulose, cellulose nitrate (CN), cellulose acetate (CA), polyethersulfone (PES), glass fiber, and acrylic copolymer.
4. The valve assembly of claim 3 , wherein the filter further comprises a backing coupled to the hydrophobic membrane, the backing comprising at least one of polyester, polyethylene, polypropylene, and nylon.
5. The valve assembly of claim 1 , wherein the hydrophobic membrane has a pore size in a range of 0.1 μm to 10.0 μm and a thickness in a range of 150 μm to 300 μm.
6. The valve assembly of claim 1 , wherein the first cavity further comprises one or more semi-annular or annular ridges disposed therein, the one or more ridges defining one or more channels.
7. The valve assembly of claim 6 , wherein the second cavity further comprises one or more semi-annular or annular ridges disposed therein, the one or more ridges defining one or more channels.
8. The valve assembly of claim 1 , wherein at least a portion of the second cavity has a cross-sectional area substantially the same or greater than the cross-sectional area of the second end of the first cavity.
9. The valve assembly of claim 1 , wherein a second flow passageway between the first conduit and the first cavity is perpendicular to the first flow passageway through the second port, the second conduit, and the third port.
10. The valve assembly of claim 1 , wherein the third port comprises a luer lock.
11. The valve assembly of claim 1 , wherein the first flow passageway between the second cavity and the second conduit has a smaller diameter than a second flow passageway between the first cavity and the first conduit.
12. The valve assembly of claim 1 , wherein a second flow passageway through the first port is parallel to the first flow passageway through the second port, the second conduit, and the third port.
13. The valve assembly of claim 1 , wherein the flow passageway through the second port, second conduit, and third port is straight.
14. The valve assembly of claim 13 , wherein the first flow passageway through the second port, the second conduit, and the third port is parallel to the planar face of the hydrophobic membrane.
15. The valve assembly of claim 13 , wherein the first flow passageway through the second portion provides unimpeded flow from the second port to the third port without an intervening filter.