WO2011058470A1 - Method and device for airway clearance - Google Patents

Method and device for airway clearance Download PDF

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Publication number
WO2011058470A1
WO2011058470A1 PCT/IB2010/054831 IB2010054831W WO2011058470A1 WO 2011058470 A1 WO2011058470 A1 WO 2011058470A1 IB 2010054831 W IB2010054831 W IB 2010054831W WO 2011058470 A1 WO2011058470 A1 WO 2011058470A1
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WO
WIPO (PCT)
Prior art keywords
airway
vibration
velocity
unit
parameters
Prior art date
Application number
PCT/IB2010/054831
Other languages
French (fr)
Inventor
Maarten Leonardus Christian Brand
Original Assignee
Koninklijke Philips Electronics N.V.
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.)
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Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2011058470A1 publication Critical patent/WO2011058470A1/en

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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
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M16/0006—Accessories therefor, e.g. sensors, vibrators, negative pressure with means for creating vibrations in patients' airways
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H23/00—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/01—Constructive details
    • A61H2201/0173—Means for preventing injuries
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/16—Physical interface with patient
    • A61H2201/1602—Physical interface with patient kind of interface, e.g. head rest, knee support or lumbar support
    • A61H2201/165—Wearable interfaces
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5007—Control means thereof computer controlled
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5071—Pressure sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2201/00—Characteristics of apparatus not provided for in the preceding codes
    • A61H2201/50—Control means thereof
    • A61H2201/5058—Sensors or detectors
    • A61H2201/5079—Velocity sensors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H2205/00—Devices for specific parts of the body
    • A61H2205/08—Trunk
    • 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
    • A61M2016/0036—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the breathing tube and used in both inspiratory and expiratory phase

Definitions

  • the invention relates to a method and a device for airway treatment, in particular, to a method and a device for airway clearance.
  • mucus For a patient with Chronic Obstructive Pulmonary Disease (COPD), Asthma, or Cystic Fibrosis (CF), an excessive volume of visco-elastic material, which is called mucus, may be built up in an airway of a lung system. Mucus hyper-secretion combined with a decreased ability of the lung system results in an increased chance of lung infection, increased risk of death, and a decreased effect of inhaled medicine.
  • COPD Chronic Obstructive Pulmonary Disease
  • Asthma Asthma
  • CF Cystic Fibrosis
  • vibration therapy is an accepted treatment for mucus retention.
  • a home-use vibration device may be used to cause a resonance in an airway for enhancing mucus expectoration, and the vibration frequency is stored in the home-use vibration device.
  • the vibration frequency for causing a resonance in an airway is influenced by lung properties of a lung system. For a patient of COPD or CF, the properties of his/her lung system change over time, thus, the vibration frequency for causing a resonance in airways of the lung system must be changed correspondingly.
  • An object of this invention is to provide an improved airway clearance device.
  • the airway clearance device comprises a vibrating unit for making an airway vibrate so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and comprises a monitoring unit for monitoring the validity of the set of vibration parameters.
  • the monitoring unit comprises a detecting unit for detecting the velocity of the oscillating airflow in the airway, a determining unit for determining that the velocity is not in a pre-defined velocity range, and a generating unit for generating an indication signal to indicate that the set of vibration parameters is invalid.
  • the advantage is that the airway clearance device of the invention can automatically indicate the validity of the vibration parameters used for causing vibration of an airway.
  • the vibrating unit is further intended to cause a vibration pressure in the airway
  • the detecting unit is also intended to divide the velocity by the vibration pressure.
  • the invention also provides a monitoring unit for monitoring the validity of a set of vibration parameters.
  • the monitoring unit is used for monitoring the validity of a set of vibration parameters.
  • the set of vibration parameters is used for causing vibration of an airway so as to cause an oscillating airflow in the airway.
  • the monitoring unit comprises a detecting unit for detecting the velocity of the oscillating airflow in the airway, a determining unit for determining that the velocity is not in a pre-defined velocity range, and a generating unit for generating an indication signal to indicate that the set of vibration parameters is invalid.
  • the advantage is that the monitoring unit can accurately monitor the validity of the set of vibration frequencies.
  • the set of vibrating parameters is also used to cause a vibration pressure in the airway, and the detecting unit is also used to divide the velocity by the vibration pressure.
  • the advantage is that the monitoring unit of the invention can more accurately indicate the validity of the vibration parameters used for causing automatic vibration of an airway.
  • the invention also provides a method corresponding to the airway clearance device and a method corresponding to the monitoring unit.
  • the invention further provides a computer program used in the method corresponding to the monitoring unit.
  • Fig. 1 schematically shows an airway clearance device in accordance with an embodiment of the invention
  • FIG. 2 schematically shows a monitoring unit for monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention
  • FIG. 3 is a flowchart illustrating a method of airway clearance in accordance with an embodiment of the invention
  • Fig. 4 is a flowchart illustrating a method of monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention.
  • Fig. 1 schematically shows an airway clearance device in accordance with an embodiment of the invention.
  • the device 1 comprises a vibrating unit 10 for causing vibration of an airway of a lung system so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and comprises a monitoring unit 20 for monitoring the validity of the set of vibration parameters.
  • the lung system is from a human body or an animal body.
  • the set of vibration parameters may comprise a vibration frequency and a vibration amplitude.
  • the vibrating unit 10 starts to set the airway into vibration according to a start request (shown as SR. in Fig. 1) from a user.
  • the user may push a button, press a keyboard, or write on a touch screen to input the start request.
  • the vibrating unit 10 can be a flutter device for causing vibration of the airway through the mouth.
  • the vibrating unit 10 can be a High Frequency Chest Wall Oscillations (HFCWO) vest for causing vibration of the airway through the chest.
  • HFCWO High Frequency Chest Wall Oscillations
  • Fig. 2 schematically shows a monitoring unit for monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention.
  • the monitoring unit 20 is used for monitoring the validity of the set of vibration parameters.
  • the set of vibration parameters is used by the vibrating unit 10 to cause vibration of the airway for causing the oscillating airflow in the airway.
  • the monitoring unit 20 comprises a detecting unit 21 for detecting a velocity of the oscillating airflow (shown as AF in Fig. 2) in the airway, a determining unit 22 for determining that the velocity is not in a pre-defined velocity range, and a generating unit 23 for generating an indication signal (shown as IS in Fig. 1 and Fig. 2) to indicate that the set of vibration parameters is invalid.
  • a detecting unit 21 for detecting a velocity of the oscillating airflow (shown as AF in Fig. 2) in the airway
  • a determining unit 22 for determining that the velocity is not in a pre-defined velocity range
  • a generating unit 23 for generating an indication signal (shown as IS in Fig. 1 and Fig. 2) to indicate that the set of vibration parameters is invalid.
  • the vibrating unit 10 is intended to cause a vibration pressure in the airway, based on the set of vibration parameters, and the detecting unit 21 may be also intended to detect the vibration pressure.
  • the velocity of the oscillating airflow can be a
  • the detecting unit may be further used to divide the velocity of the oscillating airflow by the vibration pressure.
  • the pre-defined velocity range may be established based on an unprocessed/raw velocity or a velocity divided by the vibration pressure.
  • the device 1 further comprises a database (not shown in Fig. 1 and Fig. 2) for storing the set of vibration parameters and the pre-defined velocity range.
  • the database may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the database may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
  • the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
  • the set of vibration parameters and the pre-defined velocity range of the database are intended to be updated through an inputting unit (not shown in Fig. 1 and Fig. 2).
  • the inputting unit can be a Universal Serial Bus connector, a touch screen, a keyboard etc.
  • the indication signal can be a light, a voice, one or more words for indicating to a user that the set of vibration parameters and the pre-defined velocity range should be updated from a testing machine
  • the testing machine may be placed in a hospital, and controlled by a doctor to test lung properties of the lung system and generate the updated vibration parameters and the updated pre-defined velocity range.
  • the inputting unit may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the inputting unit may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
  • the device 1 may comprise a receiving unit and a transmitting unit (not shown in Fig.l and Fig. 2).
  • the indication signal may be a wireless signal
  • the transmitting unit is intended to transmit the indication signal and the velocity to a server
  • the receiving unit is intended to receive an updated set of vibration parameters and an updated predefined velocity range from the server.
  • the server may be the testing machine (as mentioned in the previous example) for testing lung properties of the lung system based on the velocity, and for generating the updated vibration parameters and the updated pre-defined velocity range.
  • the receiving unit and the transmitting unit may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the receiving unit and the transmitting unit may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
  • Fig. 3 is a flowchart illustrating a method of airway clearance in accordance with an embodiment of the invention. The method comprises the steps of:
  • Fig. 4 is a flowchart illustrating a method of monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention.
  • the set of vibration parameters is used for causing vibration of the airway so as to cause the oscillating airflow in the airway.
  • the method of monitoring comprises the steps of:
  • the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
  • the vibrating step 30 is intended to cause a vibration pressure in the airway, based on the set of vibration parameters, and the detecting step 41 may be also intended to detect the vibration pressure.
  • the velocity of the oscillating airflow can be a
  • detecting step 41 may be further used to divide the velocity of the oscillating airflow by the vibration pressure.
  • the computer program is used in the method of monitoring the validity of a set of vibration parameters.
  • the set of vibration parameters is used for causing vibration of an airway so as to cause an oscillating airflow in the airway.
  • the method comprises the steps of:

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Abstract

The invention provides an airway clearance device. The airway clearance device comprises a vibrating unit (10) for making an airway vibrate so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and comprises a monitoring unit (20) for monitoring the validity of the set of vibration parameters. The monitoring unit (20) comprises: - a detecting unit (21) for detecting the velocity of the oscillating airflow in the airway, - a determining unit (22) for determining that the velocity is not in a pre-defined velocity range, and - a generating unit (23) for generating an indication signal to indicate that the set of vibration parameters is invalid.

Description

METHOD AND DEVICE FOR AIRWAY CLEARANCE
FIELD OF THE INVENTION
The invention relates to a method and a device for airway treatment, in particular, to a method and a device for airway clearance.
BACKGROUND OF THE INVENTION
For a patient with Chronic Obstructive Pulmonary Disease (COPD), Asthma, or Cystic Fibrosis (CF), an excessive volume of visco-elastic material, which is called mucus, may be built up in an airway of a lung system. Mucus hyper-secretion combined with a decreased ability of the lung system results in an increased chance of lung infection, increased risk of death, and a decreased effect of inhaled medicine.
Removing excessive mucus from an airway of a lung system is therefore highly beneficial to the health status of a patient. Currently, vibration therapy is an accepted treatment for mucus retention. For example, based on a vibration frequency, a home-use vibration device may be used to cause a resonance in an airway for enhancing mucus expectoration, and the vibration frequency is stored in the home-use vibration device. The vibration frequency for causing a resonance in an airway is influenced by lung properties of a lung system. For a patient of COPD or CF, the properties of his/her lung system change over time, thus, the vibration frequency for causing a resonance in airways of the lung system must be changed correspondingly.
However, only specific expensive equipment available in big hospitals can be used to test changes of lung properties of a lung system, and then provide a corresponding vibration frequency for causing a resonance in an airway of the lung system, based on the changed lung properties. The home-use device cannot change the stored vibration frequency automatically, and furthermore, a user does not know when lung properties change and when the stored vibration frequency of a home-use device needs to be changed correspondingly.
Thus, it is still difficult to enhance mucus expectoration effectively, based on the current home-use device.
SUMMARY OF THE INVENTION
An object of this invention is to provide an improved airway clearance device.
The airway clearance device comprises a vibrating unit for making an airway vibrate so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and comprises a monitoring unit for monitoring the validity of the set of vibration parameters. The monitoring unit comprises a detecting unit for detecting the velocity of the oscillating airflow in the airway, a determining unit for determining that the velocity is not in a pre-defined velocity range, and a generating unit for generating an indication signal to indicate that the set of vibration parameters is invalid.
The advantage is that the airway clearance device of the invention can automatically indicate the validity of the vibration parameters used for causing vibration of an airway.
In an embodiment of the invention, the vibrating unit is further intended to cause a vibration pressure in the airway, and the detecting unit is also intended to divide the velocity by the vibration pressure. A further advantage is that the airway clearance device of the invention can more accurately indicate the validity of the vibration parameters used for causing automatic vibration of an airway.
According to another object, the invention also provides a monitoring unit for monitoring the validity of a set of vibration parameters.
The monitoring unit is used for monitoring the validity of a set of vibration parameters. The set of vibration parameters is used for causing vibration of an airway so as to cause an oscillating airflow in the airway. The monitoring unit comprises a detecting unit for detecting the velocity of the oscillating airflow in the airway, a determining unit for determining that the velocity is not in a pre-defined velocity range, and a generating unit for generating an indication signal to indicate that the set of vibration parameters is invalid.
The advantage is that the monitoring unit can accurately monitor the validity of the set of vibration frequencies.
In an embodiment of the invention, the set of vibrating parameters is also used to cause a vibration pressure in the airway, and the detecting unit is also used to divide the velocity by the vibration pressure.
The advantage is that the monitoring unit of the invention can more accurately indicate the validity of the vibration parameters used for causing automatic vibration of an airway.
The invention also provides a method corresponding to the airway clearance device and a method corresponding to the monitoring unit. The invention further provides a computer program used in the method corresponding to the monitoring unit.
Detailed explanations and other aspects of the invention will be given below.
DESCRIPTION OF THE DRAWINGS
The above and other objects and features of the present invention will become more apparent from the following detailed description considered in connection with the accompanying drawings, in which:
Fig. 1 schematically shows an airway clearance device in accordance with an embodiment of the invention;
Fig. 2 schematically shows a monitoring unit for monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention; Fig. 3 is a flowchart illustrating a method of airway clearance in accordance with an embodiment of the invention;
Fig. 4 is a flowchart illustrating a method of monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention.
The same reference numerals are used to denote similar parts throughout the Figures.
DETAILED DESCRIPTION Fig. 1 schematically shows an airway clearance device in accordance with an embodiment of the invention.
The device 1 comprises a vibrating unit 10 for causing vibration of an airway of a lung system so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and comprises a monitoring unit 20 for monitoring the validity of the set of vibration parameters.
The lung system is from a human body or an animal body. The set of vibration parameters may comprise a vibration frequency and a vibration amplitude. The vibrating unit 10 starts to set the airway into vibration according to a start request (shown as SR. in Fig. 1) from a user. The user may push a button, press a keyboard, or write on a touch screen to input the start request.
The vibrating unit 10 can be a flutter device for causing vibration of the airway through the mouth. Alternatively, the vibrating unit 10 can be a High Frequency Chest Wall Oscillations (HFCWO) vest for causing vibration of the airway through the chest.
Fig. 2 schematically shows a monitoring unit for monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention.
The monitoring unit 20 is used for monitoring the validity of the set of vibration parameters. The set of vibration parameters is used by the vibrating unit 10 to cause vibration of the airway for causing the oscillating airflow in the airway.
The monitoring unit 20 comprises a detecting unit 21 for detecting a velocity of the oscillating airflow (shown as AF in Fig. 2) in the airway, a determining unit 22 for determining that the velocity is not in a pre-defined velocity range, and a generating unit 23 for generating an indication signal (shown as IS in Fig. 1 and Fig. 2) to indicate that the set of vibration parameters is invalid.
The vibrating unit 10 is intended to cause a vibration pressure in the airway, based on the set of vibration parameters, and the detecting unit 21 may be also intended to detect the vibration pressure. The velocity of the oscillating airflow can be a
non-processed/raw velocity of the oscillating airflow or a velocity of the oscillating airflow divided by the vibration pressure (the ratio between the velocity and the vibration pressure). Therefore, the detecting unit may be further used to divide the velocity of the oscillating airflow by the vibration pressure. The pre-defined velocity range may be established based on an unprocessed/raw velocity or a velocity divided by the vibration pressure.
The device 1 further comprises a database (not shown in Fig. 1 and Fig. 2) for storing the set of vibration parameters and the pre-defined velocity range. The database may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the database may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
The indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
In an example, the set of vibration parameters and the pre-defined velocity range of the database are intended to be updated through an inputting unit (not shown in Fig. 1 and Fig. 2). The inputting unit can be a Universal Serial Bus connector, a touch screen, a keyboard etc. The indication signal can be a light, a voice, one or more words for indicating to a user that the set of vibration parameters and the pre-defined velocity range should be updated from a testing machine
(e.g. an impulse oscillation system), and the updated set of vibration parameters and the updated pre-defined velocity inputted to the database through the inputting unit. The testing machine may be placed in a hospital, and controlled by a doctor to test lung properties of the lung system and generate the updated vibration parameters and the updated pre-defined velocity range. The inputting unit may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the inputting unit may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
In another example, the device 1 may comprise a receiving unit and a transmitting unit (not shown in Fig.l and Fig. 2). The indication signal may be a wireless signal, and the transmitting unit is intended to transmit the indication signal and the velocity to a server, and the receiving unit is intended to receive an updated set of vibration parameters and an updated predefined velocity range from the server. The server may be the testing machine (as mentioned in the previous example) for testing lung properties of the lung system based on the velocity, and for generating the updated vibration parameters and the updated pre-defined velocity range. The receiving unit and the transmitting unit may be integrated in the vibrating unit 10 or the monitoring unit 20. Alternatively, the receiving unit and the transmitting unit may be integrated neither in the vibrating unit 10 nor in the monitoring unit 20.
Fig. 3 is a flowchart illustrating a method of airway clearance in accordance with an embodiment of the invention. The method comprises the steps of:
- causing vibration 30 of an airway so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and
- monitoring 40 the validity of the set of vibration parameters.
Fig. 4 is a flowchart illustrating a method of monitoring the validity of a set of vibration parameters in accordance with an embodiment of the invention. The set of vibration parameters is used for causing vibration of the airway so as to cause the oscillating airflow in the airway. The method of monitoring comprises the steps of:
- detecting 41 the velocity of the oscillating airflow in the airway,
- determining 42 that the velocity is not in a pre-defined velocity range, and
- generating 43 an indication signal to indicate that the set of vibration parameters is invalid. The indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
The vibrating step 30 is intended to cause a vibration pressure in the airway, based on the set of vibration parameters, and the detecting step 41 may be also intended to detect the vibration pressure. The velocity of the oscillating airflow can be a
non-processed/raw velocity of the oscillating airflow or a velocity of the oscillating airflow divided by the vibration pressure (the ratio between the velocity and the vibration pressure). Therefore, detecting step 41 may be further used to divide the velocity of the oscillating airflow by the vibration pressure.
The computer program is used in the method of monitoring the validity of a set of vibration parameters. The set of vibration parameters is used for causing vibration of an airway so as to cause an oscillating airflow in the airway. The method comprises the steps of:
- detecting 41 a velocity of the oscillating airflow in the airway,
- determining 42 that the velocity is not in a pre-defined velocity range, and
- generating 43 an indication signal to indicate that the set of vibration parameters is invalid.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim or in the description. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by a unit of hardware comprising several distinct elements and by a unit of a programmed computer. In the system claims enumerating several units, several of these units can be embodied by one and the same item of hardware or software. The usage of the words first, second and third, et cetera, does not indicate any ordering. These words are to be interpreted as names.

Claims

CLAIMS:
An airway clearance device comprising:
- a vibrating unit (10) for causing vibration of an airway so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and
- a monitoring unit (20) for monitoring the validity of the set of vibration parameters, comprising:
- a detecting unit (21) for detecting the velocity of the oscillating airflow in the airway,
- a determining unit (22) for determining that the velocity is not in a
pre-defined velocity range, and
- a generating unit (23) for generating an indication signal to indicate that the set of vibration parameters is invalid.
The device as claimed in claim 1, wherein the vibrating unit (10) is further intended to cause a vibration pressure in the airway, and the detecting unit (21) is also intended to divide the velocity by the vibration pressure.
The device as claimed in claim 1 , further comprising a database for storing the set of vibration parameters and the pre-defined velocity range therein.
The device as claimed in claim 1, wherein the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
5. The device as claimed in claim 1 , wherein the set of vibration parameters comprises a vibration frequency and a vibration amplitude.
6. A monitoring unit (20) for monitoring the validity of a set of vibration parameters which are used for causing vibration of an airway so as to cause an oscillating airflow in the airway, comprising: - a detecting unit (21) for detecting the velocity of the oscillating airflow in the airway,
- a determining unit (22) for determining that the velocity is not in a
pre-defined velocity range, and
- a generating unit (23) for generating an indication signal to indicate that the set of vibration parameters is invalid.
7. The monitoring unit as claimed in claim 6, wherein the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
8. The monitoring unit as claimed in claim 6, wherein the set of vibrating parameters is also used to cause a vibration pressure in the airway, and the detecting unit (21) is also intended to divide the velocity by the vibration pressure. 9. A method of airway clearance comprising the steps of:
- causing vibration (30) of an airway so as to cause an oscillating airflow in the airway, based on a set of vibration parameters, and
- monitoring (40) the validity of the set of vibration parameters, wherein the monitoring step (40) comprises the steps of
- detecting (41) the velocity of the oscillating airflow in the airway,
- determining (42) that the velocity is not in a pre-defined velocity range, and
- generating (43) an indication signal to indicate that the set of vibration parameters is invalid.
10. The method as claimed in claim 9, wherein the vibrating step (30) is intended to cause a vibration pressure in the airway, and the detecting step (41) is also intended to divide the velocity by the vibration pressure.
11. The method as claimed in claim 9, wherein the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
12. A method of monitoring the validity of a set of vibration parameters which is used for causing vibration of an airway so as to cause an oscillating airflow in the airway, comprising the steps of:
- detecting (41) the velocity of the oscillating airflow in the airway,
- determining (42) that the velocity is not in a pre-defined velocity range, and
- generating (43) an indication signal to indicate that the set of vibration parameters is invalid.
13. The method as claimed in claim 12, wherein the indication signal also indicates to update the set of vibration parameters and the pre-defined velocity range.
14. The method as claimed in claim 12, wherein the set of vibrating parameters is also used to cause a vibration pressure in the airway, and the detecting step (41) is also intended to divide the velocity by the vibration pressure.
15. The computer program used in a method of monitoring the validity of a set of vibration parameters which are used for causing vibration of an airway so as to cause an oscillating airflow in the airway, the method comprising the steps of:
- detecting (41) the velocity of the oscillating airflow in the airway,
- determining (42) that the velocity is not in a pre-defined velocity range, and
- generating (43) an indication signal to indicate that the set of vibration parameters is invalid.
PCT/IB2010/054831 2009-11-13 2010-10-26 Method and device for airway clearance WO2011058470A1 (en)

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