MEDICAL TREATMENT SYSTEM AND METHODS USING A PLURALITY OF FLUID LINES

• US 20160082173A1
• Filed: 07/13/2015
• Published: 03/24/2016
• Est. Priority Date: 01/23/2008
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Coll, Andrew S., Kerwin, John M., Scarpaci, Jacob W.
• Granted Patent: US 10,195,330 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61M 1/1522 the interface being evacuated interfaces to enhance contact
• CPC Class Codes: A61M 1/1524 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/153 the cassette being adapted for heating or cooling the treating fluid, e.g. the dialysate or the treating gas
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1561 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/159 specially adapted for peritoneal dialysis
• CPC Class Codes: A61M 1/1629 with integral heat exchanger
• CPC Class Codes: A61M 1/166 Heating for sterilisation A61M1/1686
• CPC Class Codes: A61M 1/1664 with temperature control
• CPC Class Codes: A61M 1/28 Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation
• CPC Class Codes: A61M 1/282 Operational modes
• CPC Class Codes: A61M 1/288 Priming priming in extracorporeal blood circuits A61M1/3643
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/127 with provisions for heating or cooling
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/3389 Continuous level detection A61M2205/3393 takes precedence
• CPC Class Codes: A61M 2205/36 : related to heating or cooling
• CPC Class Codes: A61M 2205/3673 : thermo-electric, e.g. Peltier effect, thermocouples, semi-conductors
• CPC Class Codes: A61M 2205/50 : with microprocessors or computers
• CPC Class Codes: A61M 2205/502 : User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 2205/6072 : Bar codes
• CPC Class Codes: A61M 2205/8206 : battery-operated

Abstract

A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include a control system that can adjust the volume of fluid infused into the peritoneal cavity to prevent the intraperitoneal fluid volume from exceeding a pre-determined amount. The control system can adjust by adding one or more therapy cycles, allowing for fill volumes during each cycle to be reduced. The control system may continue to allow the fluid to drain from the peritoneal cavity as completely as possible before starting the next therapy cycle. The control system may also adjust the dwell time of fluid within the peritoneal cavity during therapy cycles in order to complete a therapy within a scheduled time period. The cycler may also be configured to have a heater control system that monitors both the temperature of a heating tray and the temperature of a bag of dialysis fluid in order to bring the temperature of the dialysis fluid rapidly to a specified temperature, with minimal temperature overshoot.

Claims

1-37. -37. (canceled)

38. A heating system for a peritoneal dialysis apparatus comprising:

a pumping apparatus configured to pump dialysate into or out of a heater bag;

an electric heater configurable to operate at an AC line voltage in a range of about 100 to 120 volts or an AC line voltage in a range of about 200 to 240 volts;

a heater controller configured to control a temperature of the dialysate using the electric heater;

and a universal power supply configured to convert line voltage to one or more DC voltages to power the pumping apparatus and controller, and to configure the electric heater to operate at a voltage in a range of about 100 to 120 volts or in a range of about 200 to 240 volts, based on a measured current flow through the electric heater.

39. The heating system of claim 38, wherein the electric heater comprises two heating elements, an end of each heating element connected to a common point;

wherein the universal power supply comprises one or more electrical switches connecting the heating elements to line voltage in a configuration that is switchable between a parallel or series configuration;

and wherein the universal power supply comprises a circuit to measure electrical current through the electric heater, and a power supply controller arranged to control the electrical switches to configure the heating elements based on the measured current.

40. The heating system of claim 39, wherein the power supply controller is arranged to measure electrical current through the electric heater in a series configuration upon powering up of the peritoneal dialysis apparatus, and to control the one or more electrical switches to change the configuration of the heating elements if the measured current is less than a pre-determined value.

50. The heating system of claim 38, further comprising a user interface controller configured to control data communication between a user interface or an external device and the peritoneal dialysis apparatus, wherein the heater controller is configured to provide a first enabling signal and the user interface controller is configured to provide a second enabling signal, each enabling signal being necessary to provide power to the electric heater.

51. The heating system of claim 50, wherein the first and second enabling signals are both needed to close a relay providing power to the electric heater.

52. The heating system of claim 50, wherein the first enabling signal is de-activated if the heater controller detects an error condition, and wherein the second enabling signal is de-activated if the user interface controller detects an error condition.

53. The heating system of claim 52, wherein the first enabling signal or the second enabling signal is re-activated only if both the heater controller and user interface controller successfully complete one or more self-test programs.

54. The heating system of claim 38, further comprising a user interface controller configured to control data communication between a user interface or an external device and the peritoneal dialysis apparatus, wherein the heater controller is configured to provide a first disabling signal and the user interface controller is configured to provide a second disabling signal, each disabling signal being configured to cut off power to the electric heater.

55. The heating system of claim 54, wherein either the first disabling signal or the second disabling signal is configured to open one or more relays providing power to the electric heater.

56. The heating system of claim 54, wherein the first disabling signal is activated if the heater controller detects an error condition, and wherein the second disabling signal is activated if the user interface controller detects an error condition.

57. The heating system of claim 56, wherein the first disabling signal or the second disabling signal is de-activated only if both the heater controller and user interface controller successfully complete one or more self-test programs.

41. A method of configuring heating elements of an electric heater for a peritoneal dialysis apparatus, the electric heater comprising two heating elements, an end of each heating element connected to a common point, the method comprising:

configuring the heating elements initially in a series configuration;

connecting the electric heater to line voltage;

measuring electrical current flow through the electric heater;

determining from the measured current flow whether the line voltage is in a range of about 100-120 volts, or in a range of about 200-240 volts;

providing a user of the peritoneal dialysis apparatus with information about the determined line voltage;

and receiving a verification signal from the user before finally configuring the heating elements in either a series configuration or a parallel configuration.

42. A heating system for a peritoneal dialysis apparatus comprising:

a heater bag containing dialysate solution and positioned on a heater pan;

a pumping apparatus configured to pump dialysate into and out of the heater bag;

an electrical heating element to heat the heater pan;

one or more heater pan temperature sensors to detect a temperature of the heater pan;

a dialysate temperature sensor mounted in the heater pan, thermally isolated from the heater pan, and configured to contact an outer surface of the heater bag;

and a controller programmed to perform an inner control loop process that modulates electrical power provided to the heating element to achieve a target heater pan temperature as measured by the one or more heater pan temperature sensors, and programmed to perform an outer control loop process that determines the target heater pan temperature based on a difference between a predetermined target dialysate temperature and the dialysate temperature as measured by the dialysate temperature sensor.

43. A liquid heating system comprising:

a heater bag containing a liquid and positioned on a heater pan;

a pumping apparatus configured to pump liquid into and out of the heater bag;

an electrical heating element to heat the heater pan;

one or more heating pan temperature sensors to detect a temperature of the heater pan;

a liquid temperature sensor mounted in the heater pan, thermally isolated from the heater pan, and configured to contact an outer surface of the heater bag;

and a controller programmed to perform an inner control loop process that modulates electrical power provided to the heater element to achieve a target heater pan temperature as measured by the one or more heater pan temperature sensors, and programmed to perform an outer control loop process that determines the target heater pan temperature based on a difference between a predetermined target liquid temperature and an equilibrium temperature,

wherein the equilibrium temperature is a weighted average of the liquid temperature and the heater pan temperature, the liquid temperature being weighted by a thermal capacitance, mass, or volume of liquid present in the heater bag, and the heater pan temperature being weighted by a thermal capacitance, mass, or volume of the heater pan.

44. A liquid heating system comprising:

a heater bag containing a liquid and positioned on a heater pan;

a pumping apparatus configured to pump liquid into and out of the heater bag;

an electrical heating element to heat the heater pan;

one or more heating pan temperature sensors to detect the temperature of the heater pan;

a liquid temperature sensor mounted in the heater pan, thermally isolated from the heater pan, and configured to contact an outer surface of the heater bag;

and a controller programmed to perform an inner control loop process that modulates electrical power provided to the heater element to achieve a target heater pan temperature as measured by the one or more heater pan temperature sensors, and programmed to perform an outer control loop process that determines the target heater pan temperature based on a difference between a predetermined target liquid temperature and an equilibrium temperature,

wherein the equilibrium temperature is a weighted average of the liquid temperature and the target heater pan temperature, the liquid temperature being weighted by a thermal capacitance, mass, or volume of liquid present in the heater bag, and the target heater pan temperature being weighted by the thermal capacitance, mass, or volume of the heater pan.

45. The liquid heating system of claim 44, wherein the inner control loop process includes an integrator element that generates a integral value with anti-windup logic to limit an integral value of a difference between the target heater pan temperature and the measured heater pan temperature.

46. The liquid heating system of claim 44, wherein the inner control loop process includes a maximum heater power command, the outer control loop process includes a maximum target heater pan temperature, and the outer control loop process includes an integrator element that is applied if:

a rate of change of the liquid temperature is less than a pre-determined value;

the liquid temperature is within a pre-determined range of the target liquid temperature;

the amount of liquid in the heater bag is greater than a pre-determined value;

or neither an output value of the inner control loop process, nor an output value of the outer control loop process are at pre-determined maximum values.

47. The liquid heating system of claim 44, wherein the controller is configured to set the electrical power to zero if the pan temperature exceeds a pre-determined value.

48-49. -49. (canceled)