Apparatus and methods for sequestering fluids exhausted during fluid transfer
A liquid transfer connector comprises an enclosure holding a transfer needle and an exhaust needle. A container of donor liquid may be attached to an inlet end of the transfer needle and a container holding a recipient liquid may be attached to an outlet end of the transfer needle and an inlet end of an exhaust needle. The exhaust needle has an outlet end within the connector which releases displaced fluid into an absorbent mass which sequesters the fluid to prevent leakage.
1. A liquid transfer connector for providing a liquid transfer path between a donor container having a needle-penetrable septum and a recipient container having a needle-penetrable septum, said connector comprising:
an enclosure having an interior chamber with a vent;
a transfer needle having an inlet end extending from one side of the interior chamber and an outlet end extending from another side of the interior chamber, wherein both the inlet end and the outlet end are capable of penetrating a septum on a liquid container;
an exhaust needle having an inlet end adjacent to the outlet end of the transfer needle and an outlet end in the interior chamber; and
a liquid-absorptive mass within the interior chamber, said liquid-absorptive mass adapted for rapid absorption of liquid entering the interior chamber through the exhaust needle.
2. A connector as in claim 1 , wherein the liquid-absorptive mass is at least partially formed from a liquid-absorptive foam.
3. A connector as in claim 2 , wherein the liquid-absorptive foam has an absorptive rate less than 10 seconds as measured by IS09073-6-2000.
4. A connector as in claim 3 , wherein the liquid-absorptive foam comprises a polyvinyl acetal resin.
5. A connector as in claim 1 , wherein the liquid-absorptive mass comprises a block of absorptive material having an interior void which surrounds the outlet end of the exhaust needle.
6. A connector as in claim 5 , wherein the outlet end of the exhaust needle is spaced apart from walls of the interior void so that the exhausted recipient liquid can pool in the void without submerging the inlet end.
7. A connector as in claim 1 , wherein the liquid-absorptive mass comprises absorbent beads having a size or shape which prevents passage through the vents.
8. A connector as in claim 7 , wherein the absorbent beads are loose and fill the interior chamber.
9. A connector as in claim 1 , wherein the enclosure comprises a cylindrical sleeve having a partition which separates an attachment receptacle that encloses the outlet end of the transfer needle and the inlet end of the exhaust needle from the interior chamber.
10. A connector as in claim 1 , wherein the transfer needle passes axially through the liquid-absorptive mass.
11. A method for transferring a donor liquid into a recipient liquid present in a closed container, said method comprising:
establishing a transfer flow path from a source of the donor liquid into the closed container filled with the recipient liquid;
establishing an exhaust flow path from the closed container to an absorbent mass; and
causing a volume of the donor liquid to flow into the closed container through the transfer flow path which in turn causes a like volume of the recipient liquid to flow through the exhaust flow path into the absorbent mass, wherein the entire volume of the exhausted recipient liquid is absorbed by the absorbent mass.
12. A method as in claim 11 , wherein the absorbent mass is at least partially formed from a liquid-absorptive foam.
13. A method as in claim 12 , wherein the liquid-absorptive foam has an absorptive rate less than 10 seconds as measured by IS09073-6-2000.
14. A method as in claim 13 , wherein the liquid-absorptive foam comprises a polyvinyl acetal resin.
15. A method as in claim 11 , wherein the absorbent mass comprises absorbent beads having a size or shape which prevents passage through the vents.
16. A method as in claim 15 , wherein the absorbent beads are loose and fill the interior chamber.
17. A method as in claim 11 , wherein the absorbent mass comprises a block of absorptive material having an interior void which surrounds an outlet end of the exhaust needle.
18. A method as in claim 11 , wherein the absorbent mass has an absorptive capacity equal to at least twice the volume of the donor liquid.
19. A method as in claim 17 , wherein the interior void has a volume equal to at least the volume of the donor liquid.
20. A method as in claim 17 , wherein the outlet end of the exhaust needle is spaced apart from walls of the interior void so that the exhausted recipient liquid can pool in the interior void without submerging the outlet end.
21. A method as in claim 11 , wherein the absorbent mass comprises a material that does not biologically or chemically react with the recipient liquid.
22. A connector as in claim 1 , wherein the liquid-absorptive mass comprises a material that does not biologically or chemically react with the recipient liquid.