Fluid circuit priming methods, devices, and systems
AssigneeNxStage Medical, Inc.
InventorsJames M. Brugger, William J. Schnell
Life of this patent
Estimating the term…
Abstract
According to embodiments, priming systems, methods, and devices are disclosed which allow medical treatment devices which pump fluid to be primed with minimal operator intervention and a high level of convenience. A blood circuit with a filter fitted with one or more air vents on a non-blood compartment is attached to a treatment system and priming fluid pumped slowly through the blood circuit in a loop. The source of fluid may be elevated, or the pumping may generate pressure, such that priming fluid is forced through the membrane of the filter and out the air vent(s). In embodiments, the vents are hydrophobic which prevent fluid from being ejected, so the priming system can run without intervention.
Claims15
A kit for priming a blood treatment circuit that is configured for use in hemodialysis, comprising:
- a dialyzer that includes at least a first blood port, a second blood port, a first non-blood port, and a second non-blood port, the dialyzer further including a microtubular filter fiber bundle with lumens of the microtubular filter fiber bundle terminated by an inlet header and an outlet header, the inlet header fluidly connected to the first blood port and the outlet header fluidly connected to the second blood port, and a casing surrounding the microtubular filter fiber bundle and defining a non-blood compartment that is fluidly connected to the first non-blood port and the second non-blood port;
- a blood circuit coupled to the dialyzer, with at least a first fluidly connected to the first blood port and a second fluid line fluidly connected to the second blood port;
- at least one cap fluidly connected to the first non-blood port of the dialyzer and having a hole in a central region of the at least one cap;
- a hydrophobic membrane attached to the at least one cap and covering the hole such that water or aqueous fluid is prevented from flowing through the hole while air or other gas is permitted to flow through the hole;
- a connector on at least one of the first fluid line and the second fluid line to allow a fluid connection to a fluid source;
- and
- a container of a priming fluid for said priming, the container being connectable to the first fluid line and the second fluid line, wherein
- priming fluid from the container of the priming fluid generates a positive transmembrane pressure across walls of microtubular filter fibers of the microtubular filter fiber bundle to push air out of the walls into the non-blood compartment, when the container of the priming fluid is fluidly connected to the first fluid line and the second fluid line.
Dependencies are inferred from the claim text.