Methods and systems for leak estimation

• US 10,207,068 B2
• Filed: 05/12/2017
• Issued: 02/19/2019
• Est. Priority Date: 10/18/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Jafari, Mehdi M., Arul, Periagounder R., Aviano, Jeffrey K.
• Primary Examiner(s): Anderson, Gregory
• Assistant Examiner(s): Murphy, Victoria
• Application Number:
  US15/593,611
• Publication Number:
  US 20170246409A1
• Time in Patent Office: 648 Days
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0063 Compressors
• CPC Class Codes: A61M 16/026 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
• CPC Class Codes: A61M 16/0833 T- or Y-type connectors, e.g. Y-piece
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 16/0883 Circuit type
• CPC Class Codes: A61M 16/20 Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/0033 electrical
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2016/0042 in the expiratory circuit
• CPC Class Codes: A61M 2202/0208 Oxygen
• CPC Class Codes: A61M 2202/025 Helium
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2230/06 Heartbeat rate only
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/42 Rate

Abstract

The systems and methods include providing, displaying, and/or utilizing leak estimation during ventilation of a patient with a ventilator. The systems and methods include providing, displaying, and/or utilizing internal leak estimation, total leak estimation, and/or external leak estimation during ventilation of a patient with a ventilator.

Claims

1. A ventilator system comprising:

a pressure generating system that generates a flow of breathing gas;

a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient;

sensors operatively coupled to the ventilation tubing system, the sensors include a proximal sensor and at least one of an inspiratory sensor or an expiratory sensor, wherein the sensors generate output indicative of at least one of flow and pressure;

an internal leak module that estimates an internal leak flow by modeling internal leakage as a first internal leakage component through a first internal orifice of fixed size and a second internal leakage component through a second internal orifice of varying size using sensor output from at least the proximal sensor; and

a total leak module that estimates total leak flow by modeling total leakage as a first total leakage component in the ventilation tubing system through a first circuit orifice of fixed size and a second total leakage component through a second circuit orifice of varying size using at least the output from at least one of the inspiratory sensor or the expiratory sensor.

2. The ventilator system of claim 1, further comprising:

a display that displays the internal leak flow and the total leak flow.

3. The ventilator system of claim 1, further comprising:

a display that displays the internal leak flow, the total leak flow, and an external leak flow,

wherein the total leak module estimates the external leak flow based on the total leak flow and the internal leak flow.

4. The ventilator system of claim 1, further comprising:

a controller that adjusts at least one of the flow measurement or the pressure measurement based on the internal leak flow or adjusts a volume measurement based on the internal leak flow.

5. The ventilator system of claim 1, further comprising:

a controller that detects a condition, an event, or improper ventilation utilizing the internal leak flow.

6. The ventilator system of claim 1, further comprising:

a controller that adjusts at least one of the flow or the pressure from the sensors based on the internal leak flow and the total leak flow or adjusts a volume measurement based on the internal leak flow and the total leak flow.

7. The ventilator system of claim 1, further comprising:

a controller that detects a condition, an event, or improper ventilation utilizing the internal leak flow and the total leak flow.

8. A ventilator system comprising:

a pressure generating system that generates a flow of breathing gas;

a ventilation tubing system including a patient interface for connecting the pressure generating system to a patient;

sensors operatively coupled to the ventilation tubing system, the sensors include a proximal sensor and at least one of an inspiratory sensor or an expiratory sensor, wherein the sensors generate output indicative of at least one of flow and pressure; and

a controller that estimates an internal leak flow by modeling internal leakage as a first internal leakage component through a first internal orifice of fixed size and a second internal leakage component through a second internal orifice of varying size using sensor output from at least the proximal sensor and estimates total leak flow by modeling total leakage as a first total leakage component in the ventilation tubing system through a first circuit orifice of fixed size and a second total leakage component through a second circuit orifice of varying size using at least the output from at least one of the inspiratory sensor or the expiratory sensor.

9. The ventilator system of claim 8, wherein the controller detects a condition, an event, or improper ventilation utilizing the internal leak flow.

10. The ventilator system of claim 8, further comprising:

a display that displays at least one of internal leak flow or the total leak flow.

11. The ventilator system of claim 8, wherein the controller adjusts at least one of a flow measurement, a pressure measurement, or a volume measurement based on at least one of the internal leak flow, the total leak flow, or an external leak flow.