Abstract:
Improvements in fluid volume measurement systems are disclosed for a pneumatically actuated diaphragm pump in general, and a peritoneal dialysis cycler using a pump cassette in particular. Pump fluid volume measurements are based on pressure measurements in a pump control chamber and a reference chamber in a two-chamber model, with different sections of the apparatus being modeled using a combination of adiabatic, isothermal and polytropic processes. Real time or instantaneous fluid flow measurements in a pump chamber of a diaphragm pump are also disclosed, in this case using a one-chamber ideal gas model and using a high speed processor to obtain and process pump control chamber pressures during fluid flow into or out of the pump chamber. Improved heater control circuitry is also disclosed, to provide added or redundant safety measures, or to reduce current leakage from a heater element during pulse width modulation control of the heater. Improvements are also disclosed in the application of negative pressure during a drain phase in peritoneal dialysis therapy, and to control the amount of intraperitoneal fluid accumulation during a therapy. Improvements in efficiency are also disclosed in the movement of fluid into and out of a two-pump cassette and heater bag of a peritoneal dialysis cycler, and in the synchronization of the operation of two or more pumps in a peritoneal dialysis cycler or other fluid handling devices using a multi-pump arrangement.
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.
Abstract:
Un sistema de tratamiento médico, tal como sistema de diálisis peritoneal, puede incluir control y otras características para mejorar la comodidad del paciente y facilidad del uso; por ejemplo, un sistema de diálisis peritoneal puede incluir un sistema de control que puede ajustar el volumen de fluido infundido en la cavidad peritoneal para evitar que el volumen de fluido intraperitoneal exceda una cantidad predeterminada; el sistema de control puede ajustar agregando uno o más ciclos de terapia, permitiendo reducir los volúmenes de llenado durante cada ciclo; el sistema de control puede continuar permitiendo que el fluido drene de la cavidad peritoneal tan completamente como sea posible antes de iniciar el siguiente ciclo de terapia; el sistema de control también puede ajustar el tiempo de residencia de fluido dentro de la cavidad peritoneal durante ciclos de terapia para completar una terapia dentro de un período programado; el ciclador también puede estar configurado para tener un sistema de control del calentador que monitoree tanto la temperatura de una charola de calentamiento como la temperatura de una bolsa de fluido de diálisis para llevar la temperatura del fluido de diálisis rápidamente a una temperatura específica, con mínimo excedente de temperatura.
Abstract:
Abstract 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 electrical heater; and a universal power supply configured to convert line voltage to one or more DC voltages to power the pumping apparatus and heater 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 electrical heater.
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 predetermined 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.
Abstract:
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 pre-determined target dialysate temperature and the dialysate temperature as measured by the dialysate temperature sensor.
Abstract:
Abstract 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 electrical heater; and a universal power supply configured to convert line voltage to one or more DC voltages to power the pumping apparatus and heater 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 electrical heater.
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 predetermined 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.
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 predetermined 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. V: C`3 Cl) C=> un, I 0 00 co cli
Abstract:
Un sistema de tratamiento médico, tal como sistema de diálisis peritoneal, puede incluir control y otras características para mejorar la comodidad del paciente y facilidad del uso; por ejemplo, un sistema de diálisis peritoneal puede incluir un sistema de control que puede ajustar el volumen de fluido infundido en la cavidad peritoneal para evitar que el volumen de fluido intraperitoneal exceda una cantidad predeterminada; el sistema de control puede ajustar agregando uno o más ciclos de terapia, permitiendo reducir los volúmenes de llenado durante cada ciclo; el sistema de control puede continuar permitiendo que el fluido drene de la cavidad peritoneal tan completamente como sea posible antes de iniciar el siguiente ciclo de terapia; el sistema de control también puede ajustar el tiempo de residencia de fluido dentro de la cavidad peritoneal durante ciclos de terapia para completar una terapia dentro de un período programado; el ciclador también puede estar configurado para tener un sistema de control del calentador que monitoree tanto la temperatura de una charola de calentamiento como la temperatura de una bolsa de fluido de diálisis para llevar la temperatura del fluido de diálisis rápidamente a una temperatura específica, con mínimo excedente de temperatura.