An instrument for continuous recirculation of peritoneal dialysate to infuse and drain out the dialysate automatically through catheters implanted in a peritoneal cavity of a human body. The instrument includes a prefilter, a primary filter comprising a semipermeable membrane having a maximum permeable...http://www.google.com.au/patents/US6666842?utm_source=gb-gplus-sharePatent US6666842 - Device and method for perfusing peritoneal dialyzing fluid