Baxter Travenol Laboratories, Inc.

Extracorporeal Medical Systems, Inc.

Edward R Lindsay, Jr

James D Aid

Norman F Cameron

Stephen Mason Meginniss, Iii

Robert C Kusmierczyk

A pressure regulating system for a hemodialysis machine utilizes a deaeration pump and a regulator in a deaeration loop for minimizing pressure and flow transients in a heated water supply. The deaeration loop has the pump, a deaeration pressure regulator, a deaerator, and a back pressure regulator. The pump produces a negative pressure in heated water entering the deaeration pressure regulator to circulate the water in the deaeration loop and to enhance removal of air from the water. The back pressure regulator controls the loop water pressure to a value greater than the incoming water pressure and supplies water to the dialyzer system of the machine isolated from supply water pressure and flow variations.

Water pressure regulator for hemodialysis apparatus

An automated disinfection system for a hemodialysis machine having a proportioning pump includes a manifold block having a check valve for connection to a container of disinfection solution. The manifold block has an outlet connected to the suction line of the pump and an inlet connected to a warm water source via a solenoid valve. A timing and control circuit controls the solenoid valve to produce a water rinse cycle when the solenoid valve is open and a disinfection cycle when the solenoid valve is closed. The check valve closes when positive pressure is present in the manifold block during a rinse cycle and opens to admit solution to the pump when negative pressure is present in the manifold block during a disinfection cycle.

Automated disinfection system

A transmembrane pressure regulator especially useful in artificial kidney systems. The regulator will maintain a pre-selected dialysate pressure at a substantially constant value despite changes in dialysate flow. The regulator of the invention will adjust dialysate pressure in response to changes in a patient's venous blood pressure so as to maintain a transmembrane pressure substantially constant at a preselected value.

Pressure regulator

A system continuously prepares dialysate by mixing water under pressure with concentrate to form dialysate under pressure. This dialysate is supplied on demand to a single patient station or to a plurality of patient stations. The pressure at which this dialysate is supplied to multiple patient stations is controlled so changes in the flow to one station will not change the pressure at which dialysate is supplied to other stations. A pressure regulator senses the pressure of the dialysate supplied to the patient stations and controls a regulator valve connected between the source of water under pressure and a proportioning pump which mixes this water with concentrate. The regulator includes a constant force spring assembly which provides a constant bias against the pressure in a sensing chamber over a range of linear movement of the pressure sensing element.

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Clearwater, FL, United States of America

Edward R Lindsay, Jr