Fluid line connector devices methods and systems

1. A method of supplying a fluid for a renal replacement therapy, comprising:

providing a fluid circuit that is fluidly connected by a first tube to a fluid channel element that has a first end and an opposite second end, the first end connected to the first tube and the second end connected to a second tube that extends to a first connector closed with a cap;

removing the cap from the first connector;

connecting the first connector to a luer-type connector on a first source of the fluid to create a fluid connection from the first source through the fluid channel element to the fluid circuit;

supplying the fluid from the first source of the fluid to begin a therapeutic treatment, the supplying including flowing the fluid through the fluid channel element in a flow direction from the second end to the first end;

halting the supplying of the fluid from the first source prior to completing the therapeutic treatment;

fracturing the fluid channel element between the first end and the second end to form a second connector attached to the first end of the fluid channel element and to physically separate the second end from the first end;

connecting the second connector to a luer-type connector on a second source of the fluid;

flowing the fluid from the second source through the second connector in said flow direction; and

continuing the therapeutic treatment with the fluid from the second source, wherein

the first connector and the second connector are physically configured to mate with a same luer-type connector.

2. The method of claim 1 , further comprising, after halting said supplying of the fluid, clamping a tube that connects the first source of the fluid to the fluid channel element.

3. The method of claim 1 , further comprising, after halting said supplying of the fluid, clamping a tube that connects the first source of the fluid to the fluid channel element using a non-reopenable clamp.

4. The method of claim 1 , further comprising, after halting said supplying of the fluid, clamping a tube that connects the first source of the fluid to the fluid channel element using a non-reopenable clamp and leaving the second end of the fluid channel element connected by the first connector to the first source of the fluid to keep the first source sealed from an external environment.

5. The method of claim 1 , wherein the fracturing is effective to define and render accessible a mouth of an opening of the second connector.

6. The method of claim 5 , wherein the second connector is female luer type connector.

7. The method of claim 1 , wherein the fluid channel element is a generally cylindrical plastic part.

8. The method of claim 7 , wherein the fracturing includes fracturing at a circular score line on the generally cylindrical plastic part.