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US 12,611,494 B2Granted
Thermal disinfection system for a medical apparatus
AssigneeGambro Lundia AB
InventorsPatrik Persson, Jan Lunsjo
Life of this patent
Estimating the term…
Abstract
A thermal disinfection system and a method to perform a thermal disinfection procedure of fluid lines of a medical apparatus are disclosed herein. In an example, the thermal disinfection procedure comprises at least the steps of receiving a temperature signal from a temperature sensor, determining a measured temperature value of a fluid within a hydraulic circuit, receiving a pressure signal from a pressure sensor, determining a measured local atmospheric pressure value, and driving a heating unit to heat the fluid based on the measured temperature value and the measured local atmospheric pressure value.
Claims25
A thermal disinfection system including a blood treatment apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis supply line extending from a fluid inlet to a dialysis fluid supply outlet connectable to an inlet of a dialyzer;
- a dialysis effluent line extending from a dialysate fluid return inlet to a drain exit, the dialysate fluid return inlet being configured to connect to an outlet of the dialyzer;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- at least one temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the blood treatment apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the at least one temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value, and
- driving the heating unit to heat the fluid based on the measured temperature value and the measured local atmospheric pressure value,
- wherein the measured local atmospheric pressure value is related to a set temperature of the fluid by a predefined relationship that defines a boiling point temperature (“BPT”) as a function of the measured local atmospheric pressure value,
- wherein 0.9·BPT<Tfluid_set<0.99·BPT.
9 more elements
A thermal disinfection system including a water purification apparatus comprising a hydraulic circuit connectable to medical apparatus, the hydraulic circuit comprising:
- an inlet port for receiving water from a water source;
- a filtration unit comprising one or more water filters configured to remove impurities from the water at least during a treatment session performed by the medical apparatus;
- a heating unit configured to heat the water within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a water temperature;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system;
- wherein the water purification apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the water temperature from the temperature sensor and determining a measured temperature value of the water within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value, and
- driving the heating unit to heat the water based on the measured temperature value and the measured local atmospheric pressure value,
- wherein the measured local atmospheric pressure value is related to a set temperature by a predefined relationship that defines a boiling point temperature (“BPT”) as a function of the measured local atmospheric pressure value,
- wherein 0.9·BPT<Tfluid_set<0.99·BPT.
9 more elements
A thermal disinfection system including a peritoneal dialysis apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis fluid supply line extending from a dialysis fluid inlet to a dialysis fluid supply outlet configured to directly or indirectly transfer fresh peritoneal dialysis fluid to a patient's catheter;
- a dialysis effluent line extending from a spent peritoneal dialysis fluid inlet to a drain exit, the spent peritoneal dialysis fluid inlet being configured to directly or indirectly receive spent peritoneal dialysis fluid from the patient's catheter;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the peritoneal dialysis apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value, and
- driving the heating unit to heat the fluid based on the measured temperature value and the measured local atmospheric pressure value,
- wherein the measured local atmospheric pressure value is related to a set temperature by a predefined relationship that defines a boiling point temperature (“BPT”) as a function of the measured local atmospheric pressure value,
- wherein 0.9·BPT<Tfluid_set<0.99·BPT.
9 more elements
A thermal disinfection system including a blood treatment apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis supply line extending from a fluid inlet to a dialysis fluid supply outlet connectable to an inlet of a dialyzer;
- a dialysis effluent line extending from a dialysate fluid return inlet to a drain exit, the dialysate fluid return inlet being configured to connect to an outlet of the dialyzer;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the blood treatment apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value,
- determining a set temperature of the fluid based on the measured local atmospheric pressure value to avoid boiling the fluid within the hydraulic circuit, the set temperature including a temperature between 70° C. and 105° C., based on the set temperature, calculating an estimated time to complete the thermal disinfection procedure,
- comparing the estimated time to complete the thermal disinfection procedure to a reference time, and
- based on the comparison, continuing with the thermal disinfection procedure or providing a recommendation to start a different disinfection procedure.
9 more elements
A thermal disinfection system including a blood treatment apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis supply line extending from a fluid inlet to a dialysis fluid supply outlet connectable to an inlet of a dialyzer;
- a dialysis effluent line extending from a dialysate fluid return inlet to a drain exit, the dialysate fluid return inlet being configured to connect to an outlet of the dialyzer;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the blood treatment apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value Patm,
- determining a set temperature of the fluid based on the measured local atmospheric pressure value Patm to avoid boiling the fluid within the hydraulic circuit, the set temperature including a temperature between 70° C. and 105° C.,
- driving the heating unit to heat the fluid to the set temperature,
- receiving a set disinfection dose representative of a required disinfection grade,
- receiving a threshold temperature value,
- calculating, during the thermal disinfection procedure, an achieved disinfection dose based on an elapsed time and a reference fluid temperature measured by the temperature sensor, the reference fluid temperature being substantially a lowest fluid temperature within the hydraulic circuit during the thermal disinfection procedure, wherein calculation of the achieved disinfection dose starts when a reference temperature of the heated fluid equals or exceeds the threshold temperature value, and
- comparing the achieved disinfection dose to the set disinfection dose and, based on the comparison, discontinuing the disinfection procedure when the achieved disinfection dose equals or exceeds the set disinfection dose.
12 more elements
A thermal disinfection system including a blood treatment apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis supply line extending from a fluid inlet to a dialysis fluid supply outlet connectable to an inlet of a dialyzer;
- a dialysis effluent line extending from a dialysate fluid return inlet to a drain exit, the dialysate fluid return inlet being configured to connect to an outlet of the dialyzer;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the blood treatment apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value, and
- driving the heating unit to heat the fluid based on the measured temperature value and the measured local atmospheric pressure value,
- wherein the control unit is further configured to either:
- update the measured local atmospheric pressure value after receiving subsequent pressure signals from the pressure sensor during the thermal disinfection procedure continuously, periodically, or randomly according to a predetermined sample rate that is between 0.01 Hz and 1000 Hz, the control unit being further configured to update a set temperature during the thermal disinfection procedure based on the updated measured local atmospheric pressure value;
- or
- measure the local atmospheric pressure using the pressure sensor at an initial stage of the thermal disinfection procedure or just before starting the thermal disinfection procedure, and set the set temperature at the initial stage of the thermal disinfection procedure according to the measured local atmospheric pressure, the set temperature being kept constant during the thermal disinfection procedure.
11 more elements
A thermal disinfection system including a blood treatment apparatus comprising a hydraulic circuit for fluid transit, the hydraulic circuit including:
- a dialysis supply line extending from a fluid inlet to a dialysis fluid supply outlet connectable to an inlet of a dialyzer;
- a dialysis effluent line extending from a dialysate fluid return inlet to a drain exit, the dialysate fluid return inlet being configured to connect to an outlet of the dialyzer;
- a heating unit configured to heat a fluid within the hydraulic circuit;
- a temperature sensor configured to provide a signal representative of a fluid temperature within the hydraulic circuit;
- and
- a pressure sensor configured to provide a signal representative of a local atmospheric pressure at a physical location of the thermal disinfection system,
- wherein the blood treatment apparatus includes a control unit configured to perform a thermal disinfection procedure of the hydraulic circuit by:
- receiving the signal representative of the fluid temperature from the temperature sensor and determining a measured temperature value of the fluid within the hydraulic circuit,
- receiving the signal representative of the local atmospheric pressure from the pressure sensor and determining a measured local atmospheric pressure value, and
- driving the heating unit to heat the fluid based on the measured temperature value and the measured local atmospheric pressure value,
- wherein the control unit is further configured to:
- receive a set disinfection dose representative of a required disinfection grade, wherein the set disinfection dose is a thermal disinfection dose value expressed in seconds;
- calculate, during the thermal disinfection procedure, an achieved disinfection dose;
- and
- compare the achieved disinfection dose to the set disinfection dose and, based on the comparison, discontinue the thermal disinfection procedure when the achieved disinfection dose equals or exceeds the set disinfection dose,
- wherein the set disinfection dose includes a value between 500 and 1000 seconds.
13 more elements
Dependencies are inferred from the claim text.