Breathing Assistance Apparatus

• US 20080190427A1
• Filed: 05/26/2006
• Published: 08/14/2008
• Est. Priority Date: 05/26/2005
• Status: Active Grant

• Current Assignee: Fisher & Paykel Healthcare Limited
• Original Assignee: Fisher & Paykel Healthcare Limited
• Inventors: White, Craig Karl, O'Donnell, Kevin Peter, Makinson, Ian Douglas, Payton, Matthew Jon, Quill, Christopher Simon James, Glover, Virginia Louise, Drake, Emily Joy
• Granted Patent: US 8,893,715 B2
• Time in Patent Office: Days
• US Class Current: 128/203.27
• CPC Class Codes: A61M 16/0003 Accessories therefor, e.g. sensors, vibrators, negative pressure
• CPC Class Codes: A61M 16/0006 with means for creating vibrations in patients' airways
• CPC Class Codes: A61M 16/0066 Blowers or centrifugal pumps
• CPC Class Codes: A61M 16/0069 the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/009 Removing used or expired gases or anaesthetic vapours filtering, sterilising or disinfecting the exhaust air in drainage systems A61M1/784; bacterial filters in the expiratory path A61M16/1065
• CPC Class Codes: A61M 16/024 including calculation means, e.g. using a processor
• CPC Class Codes: A61M 16/0666 Nasal cannulas or tubing devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02
• CPC Class Codes: A61M 16/0683 Holding devices therefor
• CPC Class Codes: A61M 16/0875 Connecting tubes
• CPC Class Codes: A61M 16/1075 by influencing the temperature A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/109 the humidifying liquid or the beneficial agent
• CPC Class Codes: A61M 16/1095 in the connecting tubes
• CPC Class Codes: A61M 16/16 Devices to humidify the respiration air A61M16/1045 takes precedence
• CPC Class Codes: A61M 16/161 with means for measuring the humidity
• CPC Class Codes: A61M 2016/003 with a flowmeter
• CPC Class Codes: A61M 2205/3303 Using a biosensor
• CPC Class Codes: A61M 2205/3368 Temperature
• CPC Class Codes: A61M 2205/36 related to heating or cooling
• CPC Class Codes: A61M 2205/50 with microprocessors or computers
• CPC Class Codes: A61M 2230/40 Respiratory characteristics

Abstract

A breathing assistance apparatus and method of controlling a breathing assistance apparatus is disclosed. Particularly, the breathing assistance apparatus is controlled such that it has a drying cycle to enable drying of the tubing that supplies gases to a user and prevent the harbouring of pathogens within the tube. The drying cycle is preferably operated automatically by internal controllers in the apparatus. However, it may be manually activated by pressing a button on the apparatus. The drying cycle is preferably activated at the end of a user'"'"'s treatment session.

Claims

1. A breathing assistance apparatus adapted to deliver humidified gases at a desired level of humidity, flow and temperature for treatment of a patient comprising:

a) gases supply means providing a flow of gases,

b) a humidifier having a chamber adapted to receive a volume of water and a chamber heater to heat said water in said chamber, said chamber including an inlet and an outlet,

c) transportation pathway means to convey said humidified gases from said humidifier to said patient,

d) a controller having stored instructions to complete the following steps at the end of said treatment of said patient;

i) switch off power to said chamber heater,

ii) set said flow of gases from said gases supply means to a predetermined flow for a predetermined time,

iii) after said predetermined time switch off said gases supply means.

2. A breathing assistance apparatus according to claim 1 wherein said transportation pathway means has a pathway heater, and said apparatus further comprises:

a) an outlet temperature sensor measuring the temperature of said gases at said outlet to said chamber,

b) a distal temperature sensor measuring the temperature of said gases at the distal end of the transportation pathway means,

c) an ambient temperature sensor measuring ambient air temperature, and said controller includes stored instructions to;

i) control said pathway heater over said predetermined time such that the temperature of said gases at the distal end of said transportation pathway means, as sensed by said second sensor does not exceed a safe temperature level, and

ii) monitor said outlet gases temperature sensor and said ambient air temperature sensor, compare said outlet gases temperature and said ambient air temperature and when these are substantially equal end said predetermined time and switch of said gases supply means and said pathway heater.

3. A breathing assistance apparatus according to claim 1 wherein said transportation pathway means has a pathway heater, and said apparatus further comprises:

a) a distal temperature sensor measuring the temperature of said gases at the distal end of the transportation pathway means,

b) an ambient temperature sensor measuring ambient air temperature,

c) a chamber heater temperature sensor measuring said chamber heater temperature, and said controller includes stored instructions to;

iii) control said pathway heater over said predetermined time such that the temperature of said gases at the distal end of said transportation pathway means, as sensed by said second sensor does not exceed a safe temperature level, and

iv) monitor said chamber heater temperature sensor and ambient air temperature sensor, compare said chamber heater temperature and said ambient air temperature and when these are substantially equal end said predetermined time and switch off said gases supply means and said pathway heater.

4. A breathing assistance apparatus according to claim 1 wherein said transportation pathway means is an extruded plastic tube, and said pathway heater is at least two conductive wires embedded within, throughout or about the wall of said tube.

5. A breathing assistance apparatus according to claim 1 wherein said controller includes stored instructions to determine said end of said treatment when said patient activates an “

off button connected to said controller.

6. A breathing assistance apparatus according to claim 1 wherein said apparatus further comprises a patient interface sensor, and said controller includes stored instructions to determine said end of said treatment when said patient interface sensor detects that said patient has removed said patient interface for a predetermined period of time.

7. A breathing assistance apparatus according to claim 1 wherein said controller includes stored instructions to determine said end of treatment when a substantial increase of flow of gases is detected exiting said gas supply means for a predetermined period of time.

8. A breathing assistance apparatus according to claim 1 wherein said apparatus further comprises a patient interface sensor, and said controller includes stored instructions to determine said end of treatment when said patient interface sensor senses that said patient'"'"'s breathing through said patient interface has ceased for a predetermined period of time.

9. A method of controlling a breathing assistance apparatus where said apparatus is adapted to deliver humidified gases at a desired level of humidity, flow and temperature for treatment of a patient, said apparatus comprising a gases supply means providing a flow of gases, a humidifier having a chamber adapted to receive a volume of water and a chamber heater to heat said water in said chamber, transportation pathway means to convey said humidified gases from said humidifier to said patient, and a controller that stores a program which causes the controller at the end of said treatment of said patient to:

a) switch off power to said chamber heater,

b) set said flow of gases from said gases supply means to a predetermined flow for a predetermined time,

c) after said predetermined time switch off said gases supply means.

10. A method of controlling a breathing assistance apparatus according to claim 9 wherein said transportation pathway means has a pathway heater, and said apparatus further comprises an outlet temperature sensor measuring the temperature of said gases at said outlet to said chamber, a distal temperature sensor measuring the temperature of said gases at the distal end of the transportation pathway means, an ambient temperature sensor measuring ambient air temperature, and said program further causes said controller to:

a) control said pathway heater over said predetermined time such that the temperature of said gases at the distal end of said transportation pathway means, as sensed by said second sensor does not exceed a safe temperature level, and

b) monitor said outlet gases temperature sensor and said ambient air temperature sensor, compare said outlet gases temperature and said ambient air temperature and when these are substantially equal end said predetermined time and switch of said gases supply means and said pathway heater.

11. A method of controlling a breathing assistance apparatus according to claim 9 wherein said transportation pathway means has a pathway heater, and said apparatus further comprises a distal temperature sensor measuring the temperature of said gases at the distal end of the transportation pathway means, an ambient temperature sensor measuring ambient air temperature, a chamber heater temperature sensor measuring said chamber heater temperature, and said program further causes said controller to:

a) control said pathway heater over said predetermined time such that the temperature of said gases at the distal end of said transportation pathway means, as sensed by said second sensor does not exceed a safe temperature level, and

b) monitor said chamber heater temperature sensor and ambient air temperature sensor, compare said chamber heater temperature and said ambient air temperature and when these are substantially equal end said predetermined time and switch off said gases supply means and said pathway heater.

12. A method of controlling a breathing assistance apparatus according to claim 9 wherein said program further causes said controller to determine said end of said treatment when said patient activates an “

off button connected to said controller.

13. A method of controlling a breathing assistance apparatus according to claim 9 wherein said apparatus further comprises a patient interface sensor and said program further causes said controller to determine said end of said treatment when said patient interface sensor detects that said patient has removed said patient interface for a predetermined period of time.

14. A method of controlling a breathing assistance apparatus according to claim 9 wherein said program further causes said controller to determine said end of treatment when a substantial increase of flow of gases is detected exiting said gas supply means for a predetermined period of time.

15. A method of controlling a breathing assistance apparatus according to claim 9 wherein said apparatus further comprises a patient interface sensor and said program further causes said controller to determine said end of treatment when said patient interface sensor senses that said patient'"'"'s breathing through said patient interface has ceased for a predetermined period of time.

16-17. -17. (canceled)