Peritoneal dialysis machine with dual voltage heater circuit and method of operation
First Claim
1. A portable peritoneal dialysis machine, comprisinga source of PD solution,a patient line for passing PD solution to and from the patient'"'"'s abdominal cavity,a controller for delivering a predetermined quantity of PD solution to the patient'"'"'s abdomen via the patient line,a heater for heating the PD solution before delivering it to the patient, the heater including at least two heating elements electrically connected in series via a center tap,a voltage detection circuit connected to an incoming power line for sensing whether the line voltage is 220 VAC or 110 VAC and producing an output indicative of line voltage,a switch circuit responsive to the voltage detection circuit output for applying 220 VAC across the heating elements in series or 110 VAC via the center tap through the elements in parallel, whereby approximately the same wattage is automatically produced by the heater under either 220 VAC or 110 VAC so that the PD solution is heated at approximately the same rate under either voltage.
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Accused Products
Abstract
A portable peritoneal dialysis system having a dual voltage heating system that automatically reconfigures the heating circuit depending upon detection of either 110 VAC or 220 VAC to deliver the same wattage for heating PD solution before delivery to the patient, thus facilitating use of the same machine in the United States and Europe.
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Citations
12 Claims
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1. A portable peritoneal dialysis machine, comprising
a source of PD solution, a patient line for passing PD solution to and from the patient'"'"'s abdominal cavity, a controller for delivering a predetermined quantity of PD solution to the patient'"'"'s abdomen via the patient line, a heater for heating the PD solution before delivering it to the patient, the heater including at least two heating elements electrically connected in series via a center tap, a voltage detection circuit connected to an incoming power line for sensing whether the line voltage is 220 VAC or 110 VAC and producing an output indicative of line voltage, a switch circuit responsive to the voltage detection circuit output for applying 220 VAC across the heating elements in series or 110 VAC via the center tap through the elements in parallel, whereby approximately the same wattage is automatically produced by the heater under either 220 VAC or 110 VAC so that the PD solution is heated at approximately the same rate under either voltage.
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11. A method of performing peritoneal dialysis, comprising
providing a source of PD solution, providing a plurality of interconnected heating elements arranged to heat the PD solution prior to infusion, automatically detecting the line voltage, automatically reconfiguring the connection between a plurality of interconnected heating elements with the line voltage and neutral in response to the detected line voltage to supply the same wattage for heating the PD solution under at least two substantially different line voltages, heating the PD solution with the reconfigured heating elements, and infusing the patient with the PD solution.
Specification