NZ793954B2 - Methods and Apparatus for Ventilatory Treatment of Respiratory Disorders - Google Patents
Methods and Apparatus for Ventilatory Treatment of Respiratory DisordersInfo
- Publication number
- NZ793954B2 NZ793954B2 NZ793954A NZ79395417A NZ793954B2 NZ 793954 B2 NZ793954 B2 NZ 793954B2 NZ 793954 A NZ793954 A NZ 793954A NZ 79395417 A NZ79395417 A NZ 79395417A NZ 793954 B2 NZ793954 B2 NZ 793954B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- patient
- flow rate
- respiratory flow
- probe
- airway
- Prior art date
Links
- 208000023504 respiratory system disease Diseases 0.000 title claims abstract 4
- 238000000034 method Methods 0.000 title claims 3
- 230000003519 ventilatory effect Effects 0.000 title 1
- 230000000241 respiratory effect Effects 0.000 claims abstract 18
- 230000003434 inspiratory effect Effects 0.000 claims abstract 16
- 239000000523 sample Substances 0.000 claims abstract 15
- 208000008784 apnea Diseases 0.000 claims abstract 9
- 238000011156 evaluation Methods 0.000 claims abstract 8
- 230000001419 dependent effect Effects 0.000 claims abstract 4
- 238000009423 ventilation Methods 0.000 claims abstract 4
- 238000002560 therapeutic procedure Methods 0.000 claims abstract 3
- 238000002644 respiratory therapy Methods 0.000 claims 1
Abstract
Disclosed is an apparatus for treating a respiratory disorder in a patient. The apparatus comprises a pressure generator configured to deliver a flow of air at positive pressure to an airway of the patient through a patient interface, a sensor configured to generate a signal representative of respiratory flow rate of the patient, and a controller. The controller is configured to control the pressure generator to deliver ventilation therapy through the patient interface, control the pressure generator to deliver one or more probe breaths to the patient during an apnea of the patient, and determine patency of the airway from a waveform of the respiratory flow rate signal during the apnea, wherein determining the patency is dependent on one or both of an output of a shape evaluation of an inspiratory portion and an output of a shape evaluation of an expiratory portion, wherein the inspiratory portion and the expiratory portion are each determined from the respiratory flow rate waveform that is in response to at least one of the one or more probe breaths.
Claims (13)
1. Apparatus for treating a respiratory disorder in a patient, comprising: a pressure generator configured to deliver a flow of air at positive pressure to an airway of the patient through a patient interface; a sensor configured to generate a signal representative of respiratory flow rate of the patient; and a controller configured to: control the pressure generator to deliver ventilation therapy through the patient interface; control the pressure generator to deliver one or more probe breaths to the patient during an apnea of the patient; and determine patency of the airway from a waveform of the respiratory flow rate signal during the apnea, wherein determining the patency is dependent on one or both of an output of a shape evaluation of an inspiratory portion and an output of a shape evaluation of an expiratory portion, wherein the inspiratory portion and the expiratory portion are each determined from the respiratory flow rate waveform that is in response to at least one of the one or more probe breaths.
2. The apparatus of claim 1, wherein, to determine the patency of the airway, the controller is configured to: compute an inspiratory flatness ratio from an inspiratory portion of the respiratory flow rate waveform in response to the probe breath, determining the airway to be open if the inspiratory flatness ratio is below an inspiratory threshold.
3. The apparatus of claim 2, wherein the controller is further configured to compute the inspiratory threshold based on a relative size indicator of the probe breath.
4. The apparatus of claim 3, wherein the controller is further configured to compute the relative size indicator from an indicator of the size of the respiratory flow rate in response to the probe breath, an upper threshold, and a lower threshold. P1257NZ3 102
5. The apparatus of claim 4, wherein the controller is further configured to compute the indicator of the size of the respiratory flow rate in response to the probe breath as a mean of the absolute value of the respiratory flow rate in response to the probe breath, divided by a typical recent value of ventilation of the patient.
6. The apparatus of any one of claims 2 to 5, wherein the inspiratory flatness ratio is computed as a final value of a straight-line approximation to the inspiratory portion divided by an initial value of the straight-line approximation to the inspiratory portion.
7. The apparatus of any one of claims 1 to 6, wherein, to determine the patency, the controller is configured to: compute an expiratory flatness ratio from an expiratory portion of the respiratory flow rate waveform in response to the probe breath, determine the airway to be open if the expiratory flatness ratio is below an expiratory threshold.
8. The apparatus of any one of claims 1 to 7, wherein, to determine the patency, the controller is further configured to: computing an indicator of the size of the respiratory flow rate in response to the probe breath from the respiratory flow rate signal, and determining the patency based on the computed indicator.
9. The apparatus of claim 8, wherein, to determine the patency, the controller is configured to determine the airway to be closed if the computed indicator is below a lower threshold.
10. The apparatus of claim 9, wherein the lower threshold is based on a pressure support of ventilation therapy being delivered to the patient.
11. The apparatus of any one of claims 8 to 10, wherein, to determine the patency, the controller is configured to determine the airway to be open if the computed indicator is above an upper threshold.
12. A respiratory therapy system comprising: P1257NZ3 103 means for delivering a flow of air at positive pressure to an airway of a patient through a patient interface and for delivering one or more probe breaths to the patient during an apnea of the patient; means for generating a signal representative of respiratory flow rate of the patient; and means for determining patency of the airway from a waveform of the respiratory flow rate signal during the apnea, wherein the determining is dependent on one or both of an output of a shape evaluation of an inspiratory portion and an output of a shape evaluation of an expiratory portion, wherein the inspiratory portion and the expiratory portion are each determined from the respiratory flow rate waveform that is in response to at least one of the probe breaths.
13. A computer readable medium with processor control instructions which, when executed by a processor of apparatus for treating a respiratory disorder, cause the apparatus to perform a method of determining patency of the airway during an apnea of a patient, the method comprising: controlling a pressure generator to deliver one or more probe breaths to the patient during the apnea; and determining patency of the airway from a signal representative of respiratory flow rate of the patient during the apnea, wherein the determining is dependent on one or both of an output of a shape evaluation of an inspiratory portion and an output of a shape evaluation of an expiratory portion, wherein the inspiratory portion and the expiratory portion are each determined from a waveform of the respiratory flow rate signal that is in response to at least one of the one or more probe breaths. FIG. 1 100
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2016904724A AU2016904724A0 (en) | 2016-11-18 | Methods and apparatus for ventilatory treatment of respiratory disorders | |
| NZ753223A NZ753223B2 (en) | 2017-11-17 | Methods and apparatus for ventilatory treatment of respiratory disorders |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ793954A NZ793954A (en) | 2023-12-22 |
| NZ793954B2 true NZ793954B2 (en) | 2024-03-26 |
Family
ID=
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11235114B2 (en) | Methods and systems for leak estimation | |
| US10729864B2 (en) | Automatic rise time adjustment | |
| EP4321198A3 (en) | Methods and apparatus for ventilatory treatment of respiratory disorders | |
| US10065007B2 (en) | Breathing apparatus and method for support ventilation | |
| US8776792B2 (en) | Methods and systems for volume-targeted minimum pressure-control ventilation | |
| US9968751B2 (en) | Method and apparatus for resolving upper airway obstruction, resistance or instability | |
| CA3046571C (en) | Methods and systems for drive pressure spontaneous ventilation | |
| US20130047989A1 (en) | Methods and systems for adjusting tidal volume during ventilation | |
| US20140373845A1 (en) | Methods and systems for adaptive adjustment of ventilator settings | |
| JP2012005882A5 (en) | ||
| US20140261424A1 (en) | Methods and systems for phase shifted pressure ventilation | |
| WO2013016608A1 (en) | Methods and systems for model-based transformed proportional assist ventilation | |
| JP2013517827A5 (en) | ||
| SE0802624L (en) | Procedure for the automatic control of a beating system as well as associated beating device | |
| JP2019501700A5 (en) | ||
| JP5608675B2 (en) | Determination of elastance and resistance | |
| JP2019537485A5 (en) | ||
| EP3129090B1 (en) | A method for controlling mechanical lung ventilation | |
| EP4233951A3 (en) | Apparatus for treatment of respiratory disorders | |
| CN106267493B (en) | Medical breathing machine and its method of continuous measuring and calculating resistance of respiratory tract and compliance | |
| CN113226421A (en) | Pressure support system and method of providing pressure support therapy to a patient | |
| CN110892486B (en) | Ventilator gas delivery inhalation via virtual pressure trigger mechanism | |
| NZ793954B2 (en) | Methods and Apparatus for Ventilatory Treatment of Respiratory Disorders | |
| JP2017506103A5 (en) | ||
| NZ753223B2 (en) | Methods and apparatus for ventilatory treatment of respiratory disorders |