EP2010261A2 - Procédé de commande d'un appareil de tni et appareil de tni associé - Google Patents

Procédé de commande d'un appareil de tni et appareil de tni associé

Info

Publication number
EP2010261A2
EP2010261A2 EP07722285A EP07722285A EP2010261A2 EP 2010261 A2 EP2010261 A2 EP 2010261A2 EP 07722285 A EP07722285 A EP 07722285A EP 07722285 A EP07722285 A EP 07722285A EP 2010261 A2 EP2010261 A2 EP 2010261A2
Authority
EP
European Patent Office
Prior art keywords
temperature
gas
humidifier
tni
gas flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07722285A
Other languages
German (de)
English (en)
Inventor
Kilz Silvio
Ingo Müller
Martin Baecke
Ulla Schöbel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TNI MEDICAL AG
Original Assignee
Seleon GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seleon GmbH filed Critical Seleon GmbH
Publication of EP2010261A2 publication Critical patent/EP2010261A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0066—Blowers or centrifugal pumps
    • A61M16/0069—Blowers or centrifugal pumps the speed thereof being controlled by respiratory parameters, e.g. by inhalation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A61M16/1085—Preparation of respiratory gases or vapours by influencing the temperature after being humidified or mixed with a beneficial agent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A61M16/109—Preparation of respiratory gases or vapours by influencing the temperature the humidifying liquid or the beneficial agent
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
    • A61M16/1095—Preparation of respiratory gases or vapours by influencing the temperature in the connecting tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0051—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes with alarm devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
    • A61M16/022—Control means therefor
    • A61M16/024—Control means therefor including calculation means, e.g. using a processor
    • A61M16/026—Control means therefor including calculation means, e.g. using a processor specially adapted for predicting, e.g. for determining an information representative of a flow limitation during a ventilation cycle by using a root square technique or a regression analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A61M16/0666—Nasal cannulas or tubing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical
    • A61M2016/0039—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the inspiratory circuit
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3368—Temperature
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3368—Temperature
    • A61M2205/3372—Temperature compensation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/35—Communication
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3653—General characteristics of the apparatus related to heating or cooling by Joule effect, i.e. electric resistance

Definitions

  • the invention relates to devices for transnasal insufflation, which are referred to below as TNI devices.
  • the invention relates to methods for controlling TNI devices and the control of TNI devices.
  • the field of the invention are in particular TNI devices according to the preambles of claims 16, 19, 21, 23, 24, 26 and 28.
  • TNI devices are known, for example, from WO 02/062413 A2, where they are referred to as anti-snoring devices.
  • anti-snoring devices cause splinting of the upper airway by applying air via conventional or modified oxygen goggles to the nose of a user. As a result, the pressure in the airways is raised by a few mbar above the ambient pressure.
  • CPAP continous positive airway pressure
  • nasal or facial masks are used to apply the air under a pressure of around 5 mbar and a maximum of 30 mbar. Since the masks are pressed against the face with a certain pressure during the night, that is to say for a long time, skin irritation occurs and, as a consequence, problems with the acceptance of the patient.
  • evaporators in particular humidifier known.
  • the evaporator known from WO 2006/012877 A1 can be used with particular advantage.
  • radial fans are often used to convey air.
  • side channel blowers are more suitable due to the smaller hose diameter and the resulting higher pressures.
  • Low-noise and thus especially for high gas, especially air flows suitable air goggles are described in PCT / DE 2005/002335. These goggles also have a heating wire to prevent condensation in the hoses of the goggles.
  • SUBSTITUTE SHEET is. This gas temperature can be used in a surprisingly advantageous manner as an actual value in a control loop for controlling the humidifier.
  • the indirect adjustment of the gas temperature over a comfort value surprisingly offers the possibility, with a change of environmental parameters, in particular the ambient temperature, as well as other settings, such as the gas flow, to adjust the gas temperature so that it is perceived by the user in the new environment parameters or settings as pleasant without changing the comfort value.
  • the tube heating power it is advantageous to set the tube heating power so that it just compensates for the heat loss of the gas to be applied in the nasal cannula. For then the user receives as moist as possible gas, which he perceives as pleasant, without causing condensation in the nasal cannula.
  • an increase in the hose heating capacity of -2% of the maximum heating power at 10 l / min gas flow per 1 l / min gas flow difference results in the gas temperature at the outlets of the nasal cannulas being perceived as pleasant.
  • Switching off or at least reducing the hose heating power below a gas flow of 10 l per minute advantageously prevents fusion of the heating wire into the material (eg TPE or silicone) of the hoses of the nasal cannula or in the insulation of the heating wire when a hose is bent and the air flow to cool the heating wire at the kink is no longer sufficient.
  • the material eg TPE or silicone
  • FIG. 1 is a schematic diagram of a TNI device according to the invention
  • Fig. 2 shows the set gas temperature at a comfort level of 5K
  • Fig. 3 shows the set gas temperature at a comfort level of 10K
  • Fig. 4 shows the set gas temperature at a comfort level of 15K
  • Fig. 5 shows the hose heating power at a comfort value of 5K
  • Fig. 6 shows the hose heating power at a comfort value of 10K
  • Fig. 7 shows the hose heating power at a comfort value of 15K
  • TNI device 1 shows a block diagram of a TNI device 1 according to the invention.
  • a TNI device is understood in this document to mean a device which is suitable for transnasal insufflation.
  • the TNI device 1 consists of a compressor unit 2 and a humidifier unit 3, which are connected to one another by a supply voltage connection 10, a data connection 11 and an air path 12.
  • a serial interface is used as a data connection 11, a serial interface is used.
  • the humidifier unit 3 comprises a humidifier 19, a gas temperature sensor 23, a volumetric flow sensor 24, a nasal goggles 27, an ambient temperature sensor 25 and a humidifier electronics 13.
  • a humidifier 19 Currently, an accuracy of ⁇ 1K is considered sufficient for the gas temperature sensor 23.
  • the volume flow sensor AWM92100 24 from Honeywell uses the by-pass principle and therefore has no dead spaces to ensure reliable disinfection.
  • the humidifier 19 may be constructed as the humidifier described in WO 2006/012877 A1.
  • the humidifier 19 is shown only schematically in FIG. 1 and comprises a reservoir 20 for holding the liquid to be evaporated, in particular water, a cover 21 which closes pressure-tightly with the humidifier housing 41, a humidifier heater 18 which is mounted on the outside of the humidifier housing 41, a humidifier temperature sensor 22 which is mounted in close thermal contact with the humidifier heater 18 and, for safety reasons, a temperature switch 17 which is also mounted in close thermal contact with the humidifier heater 18.
  • the nasal cannula 27 may be constructed as described in PCT / DE 2005/002335. In particular, a heating wire 26 is guided through the tubes of the nasal cannula, can be compensated by the heat losses through the hoses to the environment.
  • the humidifier electronics use a Hitachi H8S / HD2328 microcontroller.
  • This microcontroller has an integrated analog-to-digital converter to which the analog signals of the volume flow sensor 24, the humidifier temperature sensor 22, the voltage of a
  • digital sensors can also be used.
  • the battery supplies power to a clock device and static memory devices (SRAM) when the TNI device is turned off.
  • SRAM static memory devices
  • a gas flow sensor 28 With the microcontroller three rotary encoders without end stop, namely a gas flow sensor 28, a start delay generator 29 and a convenience transmitter 30 are connected.
  • three pushbuttons 31, 32 and 33 are provided as controls and a non-illustrated, two-line, 20-letter wide LCD display.
  • the gas flow sensor 28 With the gas flow sensor 28, a gas flow between 10 l per minute and 20 l per minute can be set.
  • a comfort value is set, which will be explained in connection with FIGS. 2 to 7.
  • the start delay timer 29 can set the time from which the flow is ramped from zero to its setpoint.
  • the desired gas temperature function 35 which calculates the desired gas temperature at the outlet of the humidifier 19 from the gas flow measured at the volume flow sensor 24, the comfort value Co set at the comfort transmitter 30 and the ambient temperature T u measured by the ambient temperature sensor 25. This will be discussed in more detail below in connection with Figures 2 to 4.
  • the gas temperature regulator 36 is supplied with the target gas temperature Tb at the outlet of the humidifier 19 and the actual gas temperature measured by the gas temperature sensor 23.
  • the gas temperature controller 36 controls the humidifier heating power Pb supplied to the humidifier heater 18 so that the target gas temperature and the actual gas temperature match as well as possible.
  • a gas temperature sensor 23 a digital temperature sensor is provided inter alia because of the lower susceptibility to electromagnetic interference. If the microcontroller used has enough analog inputs or the inputs can be multiplexed, an analog gas temperature sensor can be used as a gas temperature sensor 23.
  • the heating power itself is controlled by pulse width modulation (PWM) in an external module. For EMC compatibility, the switching frequency has been reduced to a few heart.
  • PWM pulse width modulation
  • the guest temperature controller 36 optimally has a PID (proportional, integral, differential) characteristic. In other embodiments, however, an integral and / or proportional controller can also be used.
  • PID proportional, integral, differential
  • the hose heater control 39 which controls the hose heating power supplied to the heater wire 26 in the nasal cannula 27.
  • the hose heater control is likewise supplied to the gas flow measured at the volume flow sensor 24, the comfort value set at the comfort transmitter 30 and the ambient temperature measured by the ambient temperature sensor 25.
  • the control characteristic of the tube heater control 39 will be explained in more detail below in connection with FIGS. 5 to 7.
  • the hose heating power serves to compensate for a temperature loss of the gas to be applied when flowing up to the nasal cannula.
  • the control of the heating wire 26 is also carried out with a PWM of a few hearts, wherein the switching edges are also rounded. Since the heating wire 26 forms a loop in the nasal cannula 27, the emission of electromagnetic interference is particularly critical here.
  • the humidifier electronics 13 may further comprise a compressor controller 37, to which the flow signal of the volume flow sensor 24 and the gas flow adjusted at the gas flow sensor 28 are supplied.
  • the output signal of the compressor controller 37 is supplied via the data connection 11 of the compressor electronics 5, in particular a compressor function 38.
  • the compressor function 38 is shown by way of example in FIG.
  • the compressor function 38 linearizes the characteristic curve of the compressor 6 so that the humidifier electronics 13 can request a specific gas flow via the data connection 11.
  • the value PWMCU is proportional to the duty cycle with which the motor of the compressor 6 is controlled, with a value of 255 corresponds to a pulse width of 100% and thus the maximum engine and compressor power.
  • the temperature of the compressor via a digital compressor temperature sensor 9 and the current through the motor by a
  • the motor current sensor 7 detected.
  • the motor current sensor 7 consists of a low-impedance, with the
  • Amplifier adjusts the low voltage dropping across the resistor to an analog input of the microcontroller used in the compressor unit 2.
  • the AT90S2313 or a successor is envisaged.
  • the engine speed is determined by internal Hall sensors in the engine.
  • the switching power supply 4 supplies both the compressor unit 2 and the humidifier unit 3 via the supply voltage connection 10 with 24 V DC.
  • the 3-phase compressor engine Pope ECA27.25 is operated directly at 24 V via a suitable inverter, which also performs a pulse width modulation.
  • the supply voltage is once again reduced to 12 V and 5 V.
  • +3.3 V and -3.3 V are provided in the humidifier unit.
  • all poles of the power supply are disconnected from the mains by the switch on the back of the device (all poles power disconnection).
  • compliance data about the use of the TNI device may be stored by the user and read out via a USB (Universal Serial Bus) interface of the humidifier electronics 13.
  • USB Universal Serial Bus
  • the USB interface is galvanically isolated, so that even computers that can not be excluded to EN 60601-1 are enough.
  • the display shows Stand By. All devices of the TNI device 1 that consume significant amounts of energy are switched off.
  • the display shows the date and time as well as three icons for the gas flow, the comfort value or the start delay.
  • the stand-by push button 33 can be changed between stand-by mode and operating mode and vice versa. If one of the three encoders is operated, a bar appears in the upper line of the display, which indicates the set value by its width, and a description of the activated rotary encoder in the lower line. This mode will be left after a few seconds without any user interaction.
  • the TNI device is set to programming mode by pressing the first push-button 31.
  • the parameters are cyclically switched further.
  • the displayed parameter flashes and is changed by turning the gas flow sensor 28.
  • the first pushbutton 32 the parameters are stored and the programming mode is exited.
  • the setpoint gas temperature at the outlet of the humidifier 19 is determined with the aid of the setpoint gas temperature function 35 as a function of the set gas flow, the set comfort value and the measured ambient temperature T u .
  • the desired gas temperature function dependent on three parameters is shown in FIGS. 2 to 4.
  • Figures 5 to 7 shown in a similar manner, as the tube heating power P s is also set depending on the set gas flow, the set comfort level and the measured ambient temperature.
  • the flow V in l / min is plotted on the Y axis and the ambient temperature T u in the X axis in "C.
  • FIGS. 5 to 7 themselves are lines for equal target gas temperature Tb entered, wherein the temperature difference between two adjacent lines is 2.5 K and the numbers in the diagram indicate the target gas temperature in 0 C.
  • FIGS. 5 to 7 lines for the same hose heating power P s in are entered, the numbers indicating the hose heating power in W and a dot being used as the decimal separator.
  • the distance between two neighboring lines corresponds to a hose heat difference of 1, 25 W.
  • FIGS. 2 to 7 represent the result of extensive experiments. The aim of these experiments was to set the humidity and temperature of the applied gas so that it is perceived by the user as pleasant as possible.
  • the humidifier temperature must be approximately equal to the temperature of the applied gas to reach 80% relative humidity, and the temperature of the applied gas in the nasal cannula tubes must not drop much below the humidifier temperature to avoid condensation.
  • the humidifier temperature must be a few K above the temperature of the applied gas, so that the applied gas has 80% relative humidity on exiting the nasal goggles , The heating wire 26 is thus controlled so that it almost compensates for heat losses to the environment of the nasal cannula 27.
  • the comfort value Co has been introduced. It indicates the temperature difference between the ambient temperature and the temperature of the applied gas. As stated above, a temperature difference of 10 K is usually perceived as pleasant.
  • This comfort value Co was chosen for FIGS. 3 and 6. In FIGS. 2 and 5, a comfort value of 5 K has been set. In FIGS. 4 and 7, a comfort value of 15 K has been set.
  • the comfort value is not calibrated in K. Rather, a medium-length bar in the display corresponds to a temperature difference of 10 K. A longer or shorter bar represents qualitatively a larger or smaller temperature difference.
  • both the target gas temperature and the hose heating power is lowered below 10 l / min. This can be done as in FIGS. 5 7 to approximately 7, so that at a flow of 5 l / min or below, the hose heating power is lowered to zero.
  • the drop in humidifier heat output is steeper because the humidifier heat output is turned off when the set gas temperature drops below the ambient temperature. This is the case in Figures 2 to 4 below about 8 l / min.
  • the setpoint gas temperature is additionally raised with increasing gas flow, which at the same temperature of the applied gas leads to a greater cooling of the gas in the tubes of the nasal cannulae and thus to a lower hose heating capacity must lead.
  • Figures 2 to 7 describe the behavior of the TNI device, in particular the behavior of the target gas temperature function and the hose heating in the operating mode. After being turned on by the user, a boot program is run through before the device enters the operating mode. After being turned off by the user, the TNI device is first set to a power-off mode before it is finally shut down. This will be explained below with reference to FIG. 9.
  • the launcher runs between times t
  • the user should after switching on the TNI device by pressing the stand-by button 33 at time t
  • the start delay time is used to preheat the liquid reservoir in the tub.
  • no temperature sensor is provided which measures the temperature of the liquid in the humidifier directly.
  • the power P b1 can be calculated from the following formula (1):
  • Tb 8 the setpoint gas temperature at the outlet of the humidifier 19, T u the ambient temperature, -2 - t- j the start delay time and W the heat conductivity between humidifier heating
  • W b denotes the thermal conductivity between the humidifier heater 18 and the liquid reservoir.
  • the thermal conductivity may be subject to large fluctuations and poorly reproducible. Nevertheless, this method is especially good if or when the liquid temperature is about right and thus the heating power P b can be lowered.
  • the liquid temperature T F can be used as an actual value in a control loop.
  • the delivered gas at the outlet of the humidifier has approximately the liquid temperature T F.
  • the gas flow V ⁇ has the main purpose to avoid condensation in the flow sensor 24 and is between 1 and 5 l / min.
  • Preheating the supply of liquid can cause overshoots to be provoked to high temperatures and used to kill pathogens.
  • the three methods of preheating the liquid supply discussed above may also be combined.
  • the hose heating power P s1 remains off during the start delay time, ie between ti and t 2 . A condensation in the tubes of the nasal cannula is accepted. In another embodiment, the hose heating power P s1 can be set to a maximum of 5 W.
  • the TNI device changes to a ramp mode, in which the gas flow V and the tube heating power P s are linearly determined, for example, as shown in FIGS. 2 to 7
  • the desired gas temperature function 35 and the gas temperature controller 36 determine the humidifier heating power during the ramp mode. As a result, the humidifier heating power initially drops to 0 and rises rapidly from a flow of about 8 - 9 l / min. More desirable would be a linear course, which is shown in dashed lines in Fig. 9, but absolutely necessary this is not necessary, since the time without humidifier by the ramp duration described below is very limited in time.
  • the TNI device changes to the operating mode.
  • the ramp duration t 3 -t 2 can be set in the range from 10s to 600s as a parameter in the TNI device.
  • the Ausschaitmodus between the times U and t 5 is mainly used to blow the nasal cannula dry and so to prevent condensation after switching off the humidifier 18.
  • the switch-off mode is started by pressing the stand-by button 33 at time U. If the stand-by button 33 is pressed during the start program, it also switches to the switch-off mode. As shown in Figure 9, during the off mode, the humidifier heater is immediately shut down, whereas the gas flow and hose heat output are kept constant during the off mode.
  • the TNI can be turned off completely to complete the shutdown mode when the temperature measured by the gas temperature sensor falls below a threshold that can be calculated, for example, as the arithmetic mean of the setpoint gas temperature when the user shuts down the TNI and the ambient temperature. Additionally or alternatively, a maximum time for the shutdown mode can be programmed as a parameter of the TNI device.
  • a threshold can be calculated, for example, as the arithmetic mean of the setpoint gas temperature when the user shuts down the TNI and the ambient temperature.
  • a maximum time for the shutdown mode can be programmed as a parameter of the TNI device.

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Air Humidification (AREA)
  • Surgical Instruments (AREA)
  • Endoscopes (AREA)

Abstract

Procédé de commande d'un appareil d'insufflation nasale (TNI) (1). Un procédé permet la mesure de la température réelle du gaz à la sortie de l'humificateur (19). Selon un autre mode de réalisation, une température idéale du gaz (34) à la sortie d'un humidificateur (19) de l'appareil de TNI (1) peut être déterminée en fonction d'une température environnante (25) de l'appareil de TNI (1) ou en fonction d'un débit de gaz (28) dans l'appareil de TNI (1). Selon un autre mode de réalisation encore, une température idéale (34) du gaz à la sortie d'un humidificateur (19) de l'appareil de TNI (1) peut être déterminée en fonction d'une valeur de confort (30) prédéfinie par un utilisateur ou la puissance de chauffe d'un fil de chauffe (26) dans une lunette nasale (27) d'un appareil de TNI (1) peut être réglée de manière telle qu'un gaz sortant de la lunette nasale (27) possède environ la même température que celle qu'il avait à la sortie de l'humidificateur (19) de l'appareil de TNI (1). La présente invention concerne en outre des appareils de TNI correspondants.
EP07722285A 2006-04-24 2007-04-24 Procédé de commande d'un appareil de tni et appareil de tni associé Withdrawn EP2010261A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006019402A DE102006019402A1 (de) 2006-04-24 2006-04-24 Verfahren zur Steuerung eines TNI-Geräts sowie TNI-Gerät
PCT/DE2007/000727 WO2007121736A2 (fr) 2006-04-24 2007-04-24 Procédé de commande d'un appareil de tni et appareil de tni associé

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EP2010261A2 true EP2010261A2 (fr) 2009-01-07

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EP07722285A Withdrawn EP2010261A2 (fr) 2006-04-24 2007-04-24 Procédé de commande d'un appareil de tni et appareil de tni associé

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US (1) US20100132707A1 (fr)
EP (1) EP2010261A2 (fr)
DE (2) DE102006019402A1 (fr)
WO (1) WO2007121736A2 (fr)

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DE112007001535A5 (de) 2009-04-09
US20100132707A1 (en) 2010-06-03
DE102006019402A1 (de) 2007-10-25
WO2007121736A2 (fr) 2007-11-01
WO2007121736A3 (fr) 2008-02-21

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