DIALYSIS SYSTEM AND APPARATUS WITH INLINE INDUCTIVE FLUID HEATING
An inductive inline dialysis fluid heater is disclosed. In an example, a dialysis fluid heater includes a cylindrical tube including an inner diameter that is between 4.00 millimeters (“mm”) and 12.7 mm. The dialysis fluid heater also includes a susceptor located within the cylindrical tube and an inductive coil extending around the cylindrical tube in a non-contacting arrangement. The dialysis fluid heater further includes power electronics in electrical communication with the inductive coil and configured to supply an electrical current to the inductive coil, causing the susceptor to heat.
1 : An inductive dialysis fluid heater comprising:
a cylindrical tube including an inner diameter from 4.00 millimeters (“mm”) to 12.7 mm;
a susceptor located within the cylindrical tube;
an inductive coil extending around the cylindrical tube in a non-contacting arrangement; and
power electronics in electrical communication with the inductive coil and configured to supply an electrical current to the inductive coil, causing the susceptor to heat.
2 : The heater of claim 1 , wherein the power electronics include a resonant circuit.
3 : The heater of claim 2 , wherein the power electronics include driver electronics for the resonant circuit.
4 : The heater of claim 1 , wherein the susceptor is at least substantially smooth to mitigate a pressure drop caused by the susceptor.
5 : The heater of claim 1 , wherein the susceptor is provided in the form of a mesh.
6 : The heater of claim 1 , wherein the cylindrical tube is a first cylindrical tube and the susceptor is a first susceptor, and which includes a second cylindrical tube and a second susceptor located within the second cylindrical tube, and
wherein inductive coil extends around the first and second cylindrical tubes.
7 : The heater of claim 6 , wherein the second cylindrical tube has a same inner diameter as the first cylindrical tube.
8 : The heater of claim 6 , wherein the first and second cylindrical tubes are connected by a U-shaped connector.
9 : The heater of claim 6 , wherein the first and second cylindrical tubes are first and second tube portions folded 180 degrees from a single tube.
10 : The heater of claim 6 , further comprising:
a downstream temperature sensor located so as to sense a temperature of fluid heated by the first and second susceptors; and
an upstream temperature sensor located so as to sense a temperature of the fluid prior to being heated,
wherein the downstream and upstream temperature sensors are configured to output to a control unit controlling the power electronics.
11 : The heater of claim 1 , further comprising:
a downstream temperature sensor located so as to sense a temperature of fluid heated by the susceptor;
an upstream temperature sensor located so as to sense a temperature of the fluid prior to being heated,
wherein the downstream and upstream temperature sensors are configured to output to a control unit controlling the power electronics.
12 : A dialysis system comprising:
a disposable set including
a tube, and
a susceptor located within the cylindrical tube;
a machine enclosure including an opening sized to accept the cylindrical tube;
an inductive coil located within the machine enclosure and extending around the cylindrical tube when the cylindrical tube is inserted into the opening; and
power electronics located within the machine enclosure, the power electronics in electrical communication with the inductive coil and configured to supply an electrical current to the inductive coil, causing the susceptor to heat.
13 : The system of claim 12 , wherein the cylindrical tube is a first cylindrical tube and the susceptor is a first susceptor, and which includes a second cylindrical tube and a second susceptor located within the second cylindrical tube, and
wherein inductive coil extends around the first and cylindrical tubes when inserted into the opening.
14 : The system of claim 13 , wherein the first and second cylindrical tubes are connected by a U-shaped connector.
15 : The system of claim 13 , wherein the first and second cylindrical tubes are first and second tube portions folded 180 degrees from a single tube.
16 : The system of claim 13 , further comprising:
(i) a downstream temperature sensor located within the machine enclosure so as to sense a temperature of fluid heated by the first and second susceptors when the disposable set is mounted to the machine enclosure; and
(ii) an upstream temperature sensor located within the machine enclosure so as to sense a temperature of the fluid prior to being heated when the disposable set is mounted to the machine enclosure.
17 : The system of claim 16 , further comprising a control unit electrically connected to the downstream and upstream temperature sensors, the control unit configured to control the power electronics.
18 : The system of claim 12 , further comprising:
(i) a downstream temperature sensor located within the machine enclosure so as to sense a temperature of fluid heated by the susceptor when the disposable set is mounted to the machine enclosure; and
(ii) an upstream temperature sensor located within the machine enclosure so as to sense a temperature of the fluid prior to being heated when the disposable set is mounted to the machine enclosure.
19 : The system of claim 12 , wherein the machine enclosure includes a pump actuator, and wherein the disposable set includes a pumping portion for operation with the pump actuator.
20 : The system of claim 19 , wherein the pumping portion includes a cylindrical tube which is the same as or is in fluid communication with the cylindrical tube housing the susceptor.