Medical device heaters and methods
First Claim
Patent Images
1. A dialysis machine comprising:
- a pump for pumping a medical liquid;
a heater for heating the medical liquid, the heater having a first heating element and a second heating element;
a cassette for controlling a flow of the medical liquid, the cassette being coupled to a coupling surface of the dialysis machine and comprising at least one pumping chamber, the cassette comprising a rigid base, a first flexible film on a first side of the rigid base, and a second flexible film on a second side of the rigid base, the first and second flexible films being adjacent to and in thermal contact with the first and second heating elements, respectively, of the dialysis machine such that the first and second flexible films together with underlying portions of the rigid base form a heating region of the cassette; and
a temperature sensor located at an inflow of the heating region or at an outflow of the heating region in order to measure a temperature of the medical liquid flowing into or out of the heating region of the cassette.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical device having a heater with at least one heating element which has mains voltage applied to it by a heating control unit. The heating control unit includes a monitoring arrangement and a switching arrangement. The monitoring arrangement can recognize the zero crossings of the mains voltage, and the switching arrangement can switch the at least one heating element on or off in the zero crossing. The heating control unit controls the power of the heating by switching on and off of one or more half cycles of the mains AC voltage.
-
Citations
13 Claims
-
1. A dialysis machine comprising:
-
a pump for pumping a medical liquid; a heater for heating the medical liquid, the heater having a first heating element and a second heating element; a cassette for controlling a flow of the medical liquid, the cassette being coupled to a coupling surface of the dialysis machine and comprising at least one pumping chamber, the cassette comprising a rigid base, a first flexible film on a first side of the rigid base, and a second flexible film on a second side of the rigid base, the first and second flexible films being adjacent to and in thermal contact with the first and second heating elements, respectively, of the dialysis machine such that the first and second flexible films together with underlying portions of the rigid base form a heating region of the cassette; and a temperature sensor located at an inflow of the heating region or at an outflow of the heating region in order to measure a temperature of the medical liquid flowing into or out of the heating region of the cassette. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification