Priming System and Method for Dialysis Systems

Abstract

The application is directed to an extracorporeal blood processing system capable of using dialysate to prime the system. A plastic molded compact manifold supports molded blood and dialysate fluidic pathways along with relevant sensors, valves and pumps. The compact manifold is also disposable in one embodiment and can be detachably installed in the dialysis machine. A two-way valve in the manifold is used to direct the dialysate flow through the blood circuit to prime the circuit for use in treatment.

We claim: 
     
         1 . A priming process for priming a manifold within a dialysis machine for use in a dialysis treatment, comprising the steps of:
 a. Inserting said manifold into the dialysis machine, wherein said manifold comprises a substrate defining a first circuit and a second circuit and a compressible valve structure in fluid communication with each of said first and second circuits, wherein said valve structure has a first state and a second state and wherein, when in said first state, fluid from the first circuit cannot enter into the second circuit and when in said second state, fluid from the first circuit can enter into the second circuit;   b. Placing said valve in said second state by removing pressure from said compressible valve structure;   c. Pumping fluid through said first and second circuits;   d. Placing said valve in said first state by applying pressure to said compressible valve structure; and   e. Removing fluid from said second circuit.   
     
     
         2 . The priming process of  claim 1  wherein the first circuit is a dialysate circuit and wherein the second circuit is a blood circuit. 
     
     
         3 . The priming process of  claim 2  wherein the fluid is dialysate and wherein, in said second state, the dialysate flows through the dialysate circuit and into the blood circuit. 
     
     
         4 . The priming process of  claim 3  wherein the dialysate is removed from the blood circuit upon completion of the priming process. 
     
     
         5 . The priming process of  claim 3  wherein the dialysate is pumped from a dialysate reservoir and not from a separate source of priming fluid. 
     
     
         6 . The priming process of  claim 1  wherein said valve is placed in said first state or second state by a controller, located within the dialysis machine, actuating a valve interface physically attached to said dialysis machine. 
     
     
         7 . The priming process of  claim 6  wherein said valve interface is configured to apply pressure to, or remove pressure from, said compressible valve structure upon actuation by said controller. 
     
     
         8 . A priming process for priming a manifold within a dialysis machine, having a housing defining a cavity, for use in a dialysis treatment, comprising the steps of:
 a. Receiving said manifold into the cavity, wherein said manifold comprises a substrate defining a dialysate circuit and a blood circuit and a compressible valve structure in fluid communication with each of said dialysate and blood circuits, wherein said valve structure has a treatment state and a priming state and wherein, when in said treatment state, fluid from the dialysate circuit cannot enter into the blood circuit and when in said priming state, fluid from the dialysate circuit can enter into the blood circuit;   b. Having said valve in said priming state by not applying pressure to said compressible valve structure;   c. Pumping dialysate through said dialysate and blood circuits;   d. Placing said valve in said treatment state by applying pressure to said compressible valve structure; and   e. Removing dialysate from said blood circuit.   
     
     
         9 . The priming process of  claim 8  wherein the dialysate is pumped from a dialysate reservoir and not from a separate source of priming fluid. 
     
     
         10 . The priming process of  claim 8  wherein said valve is placed in said treatment or priming state by a controller, located within the dialysis machine, that is configured to actuate a valve interface within said dialysis machine. 
     
     
         11 . The priming process of  claim 9  wherein said valve interface is configured to apply pressure to, or remove pressure from, said compressible valve structure upon actuation by said controller. 
     
     
         12 . A priming process for use in a dialysis treatment system, wherein said dialysis treatment system comprises a housing defining a cavity, said cavity capable of receiving a manifold, wherein the manifold comprises a plastic substrate comprising a first layer and a second layer, a first flow path defined by a first surface of the first layer and a first surface of the second layer, a second flow path defined by a first surface of the first layer and a first surface of the second layer, and a valve in fluid communication with both said first flow path and said second flow path wherein said valve has first state and a second state and wherein, when in said first state, the first flow path and second flow path are in fluid isolation and when in said second state, the first flow path and second flow path are in fluid communication, and a compressible valve structure in said manifold and positioned over said valve, said priming process comprising the steps of:
 a. Receiving said manifold into the cavity;   b. Having said valve in said second state by not applying pressure to said compressible valve structure;   c. Pumping fluid through said first and second flow paths;   d. Placing said valve in said first state by applying pressure to said compressible valve structure; and   e. Removing fluid from said second flow path.   
     
     
         13 . The priming process of  claim 12  wherein the first flow path is a dialysate flow path and wherein the second flow path is a blood flow path. 
     
     
         14 . The priming process of  claim 13  wherein the fluid is dialysate and wherein, in said second state, the dialysate flows through the dialysate flow path and into the blood flow path. 
     
     
         15 . The priming process of  claim 14  wherein the dialysate is removed from the blood flow path upon completion of the priming process. 
     
     
         16 . The priming process of  claim 14  wherein the dialysate is pumped from a dialysate reservoir and not from a separate source of priming fluid. 
     
     
         17 . The priming process of  claim 12  wherein said valve is placed in said first state or second state by actuating a valve interface within said dialysis machine. 
     
     
         18 . The priming process of  claim 17  wherein said valve interface is configured to apply pressure to, or remove pressure from, said compressible valve structure upon actuation by said controller. 
     
     
         19 . The priming process of  claim 18  wherein said compressible valve structure is a diaphragm. 
     
     
         20 . The priming process of  claim 1  wherein said compressible valve structure is a diaphragm.