Peritoneal dialysis system having phase change material (“PCM”) heat exchange

A peritoneal dialysis (“PD”) system comprising:

• a PD fluid pump;
• a PD fluid heater positioned and arranged to heat fresh PD fluid pumped by the PD fluid pump;
• and
• a phase change material (“PCM”) device positioned and arranged to receive the fresh PD fluid that is heated by the PD fluid heater, the PCM device including:
• a PCM having a melting temperature selected so that the PCM solidifies when the fresh PD fluid is underheated and contacts the PCM, transferring heat to the underheated fresh PD fluid, and
• a conductive wall configured to separate the PCM from heated priming fluid or used PD fluid,
• wherein the PD system is configured to melt the PCM prior to the underheated fresh PD fluid contacting the PCM, the melting caused by flowing the heated priming fluid past the PCM or flowing the used PD fluid past the PCM.

A peritoneal dialysis (“PD”) system comprising:

• a PD fluid pump;
• a PD fluid heater positioned and arranged to heat fresh PD fluid pumped by the PD fluid pump;
• a phase change material (“PCM”) device positioned and arranged to receive the fresh PD fluid that is heated by the PD fluid heater, the PCM device including a PCM having a melting temperature selected so that the PCM solidifies when the fresh PD fluid is underheated and contacts the PCM, transferring heat to the underheated fresh PD fluid;
• a dual lumen patient line;
• a fresh PD fluid line for fluid communication with a fresh PD fluid lumen of the dual lumen patient line;
• a used PD fluid line for fluid communication with a used PD fluid lumen of the dual lumen patient line;
• and
• at least one valve positioned and arranged to selectively allow
• (a) the fresh PD fluid to flow through the PCM device, the fresh PD fluid line, and the fresh PD fluid lumen, and
• (b) the used PD fluid to flow through the used PD fluid lumen, the used PD fluid line, and the PCM device.

A peritoneal dialysis (“PD”) system comprising:

• a PD fluid pump;
• a PD fluid heater positioned and arranged to heat fresh PD fluid pumped by the PD fluid pump;
• a phase change material (“PCM”) device positioned and arranged to receive the fresh PD fluid that is heated by the PD fluid heater, the PCM device including a PCM having a melting temperature selected so that the PCM solidifies when the fresh PD fluid is underheated and contacts the PCM, transferring heat to the underheated fresh PD fluid;
• a single lumen patient line;
• and
• a fresh and used PD fluid line for fluid communication with the single lumen patient line, the fresh and used PD fluid line positioned and arranged to accept the fresh PD fluid from the PCM device and deliver used PD fluid to the PCM device.

A peritoneal dialysis (“PD”) system comprising:

• a PD fluid pump;
• a PD fluid heater positioned and arranged to heat fresh PD fluid pumped by the PD fluid pump;
• a first phase change material (“PCM”) device positioned and arranged to receive the fresh PD fluid that is heated by the PD fluid heater, the first PCM device including a first PCM having a melting temperature selected so that the first PCM solidifies when the fresh PD fluid is underheated and contacts the first PCM, transferring heat to the underheated fresh PD fluid;
• and
• a second PCM device including a second PCM having a second melting temperature selected so that the second PCM melts when the fresh PD fluid is overheated and contacts the second PCM, removing heat from the overheated fresh PD fluid.