Breathing assistance device with several secure respirator modes and associated method

• US 7,891,353 B2
• Filed: 08/28/2003
• Issued: 02/22/2011
• Est. Priority Date: 08/29/2002
• Status: Active Grant

• Current Assignee: Resmed Paris (ResMed Incorporated)
• Original Assignee: Resmed Paris (ResMed Incorporated)
• Inventors: Chalvignac, Philippe
• Primary Examiner(s): Douglas; Steven O
• Assistant Examiner(s): Dixon; Annette F
• Application Number:
  US10/544,318
• Publication Number:
  US 20070000491A1
• Time in Patent Office: 2,735 Days
• Field of Search: 128/200.24, 12820418-20512, 128/202.22, 128/205.23
• US Class Current: 128/204.21
• CPC Class Codes: A61M 16/0051 with alarm devices
• CPC Class Codes: A61M 16/0057 Pumps therefor
• 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 16/021 operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/20 Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 16/205 used for exhalation control
• CPC Class Codes: A61M 2016/0021 with a proportional output signal, e.g. from a thermistor
• CPC Class Codes: A61M 2016/0039 in the inspiratory circuit
• CPC Class Codes: A61M 2205/702 automatically during use

Abstract

A breathing assistance device, capable of operating according to several respiratory modes forming a list of possible modes. The device is equipped with a mechanism for selecting a desired mode from a group of modes that can be selected. The device also includes a mechanism for realising a configuration diagnostic of the device, a mechanism for associating an authorization level with each possible mode, according to the results of the diagnostic, with the lowest authorization level corresponding to unauthorised modes, a mechanism for authorizing only the selection of authorised modes, in such a way that selecting unauthorised modes is impossible.

Claims

1. Breathing assistance device to which optional elements can be connected, capable of operating according to several respiratory modes forming a list of possible respiratory modes, and equipped with means of selecting a desired respiratory mode from said list of possible respiratory modes, wherein the device comprises:

automatic configuration diagnostic means arranged for realising a configuration diagnostic of the device, in order to establish a list of the optional elements effectively connected to the device,

a processor configured for calculating an authorization level for each possible respiratory mode according to the results of the configuration diagnostic, the lowest authorization level being set to unauthorized modes,

the processor including a memory for storing the calculated authorization levels associated with each possible respiratory mode,

said processor being further configured to update a menu of respiratory modes presented to a user, to authorize only the selection of authorized respiratory modes, thereby preventing the selection of unauthorized respiratory modes by the user.

3. Device as claimed in claim 1 or claim 2, wherein the results of the configuration diagnostic include an indication on the presence of a correctly connected expiratory valve.

4. Device as claimed in claim 3, wherein the automatic configuration diagnostic means are configured to detect the presence of a correctly connected expiratory valve, by:

setting a pressure setting to be reached at the level of the expiratory valve,

controlling a pressure source of the device to reach this setting at the level of the expiratory valve,

measuring a characteristic of said source of pressure when the setting is reached,

deducing from said characteristic the presence of a correctly connected expiratory valve.

5. Device as claimed in claim 4, wherein that said characteristic of the pressure source is the energy absorbed by a turbine during its operation.

6. Device as claimed in claim 1 or claim 2, wherein that the results of the configuration diagnostic include an indication on the presence of a correctly connected proximal pressure tap.

7. Device as claimed in claim 1 or claim 2, wherein that the authorization levels for the respiratory modes comprise:

a high authorization level, corresponding to authorized modes which can be selected without any restriction by the user, and

an intermediate authorization level, corresponding to authorized modes which selection is authorized for the user and associated with a systematic alarm.

8. Device as claimed in claim 1 or claim 2, wherein the device further comprises:

means of detecting a change in the selected respiratory mode, and

means for locking the device in case a newly selected respiratory mode is detected, which authorization level is different from that of the previously selected mode.

9. Device as claimed in claim 8, wherein the means for locking the device are configured to lock the device in case a newly selected respiratory mode is detected, which authorization level is lower from that of the previously selected mode.

10. Device as claimed in claim 8, wherein the means for locking the device are configured to lock the device in case a newly selected respiratory mode is detected, which authorization level is the lowest authorization level.

11. Device as claimed in claim 8, wherein the device also includes means of unlocking the device that can be accessed by a user according to a particular operating mode.

12. Device as claimed in claim 1 or claim 2, wherein the possible respiratory modes include respiratory modes to be implemented in a “

ventilator”

configuration of the device, and respiratory modes to be implemented in a “

respirator”

configuration of the device.

13. Device as claimed in claim 12, wherein:

the possible respiratory modes include spontaneous mode, times spontaneous mode, continuous positive airway pressure mode, assisted and controlled pressure mode, aid for inspiration or spontaneous barometric mode, ventilation with pressure that is assisted and controlled or controlled barometric mode, aid for inspiration with volume ensured mode, ventilation assisted and controlled mode, and

according to the detection of the presence of a correctly connected expiratory valve during configuration diagnostic, spontaneous mode, times spontaneous mode, continuous positive airway pressure mode and assisted and controlled pressure mode are selectively authorised or unauthorized, while the other modes are selectively unauthorised or authorized, respectively.

14. Device as claimed in claim 13 taken in combination with claim 7, wherein the aid for inspiration with volume ensured mode is selectively associated with a systematic alarm in the case where, during configuration diagnostic no correct connection of a proximal pressure tap was detected.

15. Method for handling the operation of a device as claimed in claim 1 or claim 2, including the following steps:

realisation of a configuration diagnostic of the device,

association of an authorization level with each possible respiratory mode, according to the results of the configuration diagnostic, and setting of the lowest authorization level to unauthorized modes,

selective authorization of authorized modes, and prevention of the selection of unauthorized respiratory modes by the user.

16. Method as claimed in claim 15, wherein the authorization levels for respiratory modes include:

a high authorization level, corresponding to authorized modes which can be selected without any restriction by the user, and

an intermediate authorization level, corresponding to authorized modes which selection is authorized for the user and associated with a systematic alarm.

2. Breathing assistance device to which optional elements are connectable, capable of operating according to several respiratory modes forming a list of possible respiratory modes, and equipped with means for selecting a desired respiratory mode from said list of possible respiratory modes, wherein the device comprises:

a display configured to display a check-list of connections to a user for realising a configuration diagnostic of the device, in order to establish a list of optional elements effectively connected to the device,

a processor configured for calculating an authorization level for each possible respiratory mode according to the results of the configuration diagnostic, the lowest authorization level being set to unauthorized modes,

the processor including a memory for storing the calculated authorization levels associated with each possible respiratory mode,

said processor being further configured to update a menu of respiratory modes presented to a user, to authorize only the selection by the user of authorized respiratory modes, thereby preventing the selection of unauthorized respiratory modes by the user.