WO1997020592B1 - Ventilator control system and method - Google Patents

Ventilator control system and method

Info

Publication number
WO1997020592B1
WO1997020592B1 PCT/US1996/019382 US9619382W WO9720592B1 WO 1997020592 B1 WO1997020592 B1 WO 1997020592B1 US 9619382 W US9619382 W US 9619382W WO 9720592 B1 WO9720592 B1 WO 9720592B1
Authority
WO
WIPO (PCT)
Prior art keywords
breath
patient
ventilator
parameters
pneumatic system
Prior art date
Application number
PCT/US1996/019382
Other languages
French (fr)
Other versions
WO1997020592A9 (en
WO1997020592A1 (en
Filing date
Publication date
Priority claimed from US08/569,919 external-priority patent/US5931160A/en
Application filed filed Critical
Priority to AU12802/97A priority Critical patent/AU1280297A/en
Priority to EP96943601A priority patent/EP0873150A1/en
Publication of WO1997020592A1 publication Critical patent/WO1997020592A1/en
Publication of WO1997020592B1 publication Critical patent/WO1997020592B1/en
Publication of WO1997020592A9 publication Critical patent/WO1997020592A9/en

Links

Abstract

A ventilator control system (10) controls a ventilator pneumatic system (18) in a medical ventilator. The ventilator control system (10) includes a user interface (26), a memory (40) and a processor (22). The user interface receives input values from a user for setting one ore more breath parameters within a set or breath parameters. The user interface (26) can include a display (24) for displaying the status of the patient's pulmonary system and the set of breath parameters. The memory (40) stores the set of breath parameters after the user has set one or more breath parameters to desired input values. The processor (22) simultaneously adjusts a plurality of controls within a ventilator pneumatic system (18) in response to the set of breath parameters. The user can change or implement new phases, breaths, modes or therapies in seconds such that the therapy delivered to the patient (20) is essentially uninterrupted. Also, a simulator (212) may be provided for predicting the status of the patient's pulmonary system prior to adjusting the plurality of controls. The predicted status may be displayed adjacent the current status on the display (24).

Claims

- -AMENDED CLAIMS[received by the International Bureau on 3 June 1997 (03.06.97); original claims 18-20 and 34 amended; remaining claims unchanged (9 pages)]
1. A ventilator control system for controlling a ventilator pneumatic system comprising: a user interface for receiving input values from a user for setting one or more breath parameters within a set of breath parameters; a memory electrically coupled to the user interface for storing the set of breath parameters; and a processor simultaneously adjusting a plurality of controls within a ventilator pneumatic system in response to the set of breath parameters.
2. The ventilator control system of claim 1 wherein each breath parameter comprises at least one of a control setting and an alarm setting.
3. The ventilator control system of claim 1 wherein the processor further comprises a display controller for creating a breath control structure from the set of breath parameters stored in the memory.
4. The ventilator control system αf claim 3 wherein the processor further comprises an embedded controller for simultaneously changing the plurality of controls within the ventilator pneumatic system in response to the breath control structure.
5. The ventilator control system of claim 1 further comprising a display on which software-generated images representing status of the patient s pulmonary system and the set of breath parameters are displayed.
6. The ventilator control system of claim 5 wherein the user interface comprises a touch-sensitive screen disposed over the display for manipulating one or more breath parameters.
7. A method for controlling a ventilator pneumatic system comprising: receiving input values provided by a user for setting one or more breath parameters within a 3βt of breath parameters; and - 44 -
simultaneously adjusting a plurality of controls within a ventilator pneumatic system connected to a patient in response to the set of breath parameters.
8. The method of claim 7 wherein each breath parameter comprises at least one of a control setting and an alarm setting.
9. The method of claim 7 further comprising creating a breath control structure from the set of breath parameters.
10. The method of claim 9 further comprising simultaαeously changing the plurality of controls within the ventilator pneumatic system in response to the breath control structure
11. The method of claim 7 further comprising displaying software-generated images representing status of the patient's pulmonary system and the set of breath parameters on a display.
12. A ventilator control system for simulating status of a patient connected to a v ntilator pneumatic system comprising: a user interface for receiving input values from a user to define one or more breath parameters within a set of breath parameters; a simulator electrically connected to the user interface for receiving the sec of breath parameters, the simulator predicting status of the patient's pulmonary system by simulating (i) an adjustment to a plurality of controls within the ventilator pneumatic system in response to the set of breath parameters; (ii) a response of the patient' s pulmonary system to the adjustment to the plurality of controls within the ventilator pneumatic system; and a display on which software-generated images representing predicted status of the patient's pulmonary system and the set of breath parameters are provided.
13. The ventilator control system of claim 12 wherein each breath parameter comprises at least one of a control setting and an alarm setting. - 45 -
14, The ventilator control system of claim 12 wherein the user interface comprises a touch-sensitive screen disposed over the display for manipulating one or more breath parameters.
15. A method for simulating status of the pulmonary system of a patient connected to a ventilator pneumatic system comprising: settmg one or more breath parameters within a set of breath parameters, predicting the status of the patient' s pulmonary system by (i) simulating an adjustment to a plurality of controls within the ventilator pneumatic system in response to the set of breath parameters; and (ii) simulating a response of the patient's pulmonary system to the adjustment to the plurality of controls within the ventilator pneumatic system; and displaying software-generated images representing the predicted status of the patient's pulmonary system and the set of breath parameters.
16. The method of claim 15 further comprising creating at least one breath control structure from the set of breath parameters.
17. The method of claim 16 further comprising simulating the adjustment of the plurality of controls within the ventilator pneumatic system in response to the breath control structure.
18. A method for generating a breath control structure to control a ventilator pneumatic system comprising: providing a set of breath parameters, each breath parameter within the set of breath parameters including at least one of a control setting or alarm setting, setting via a user interface control settings and alarm settings for one or more breath parameters within the set of breath parameters; creating a breath control structure from the set of breath parameters; and simultaneously adjusting a plurality of controls within a ventilator pneumatic system in response to the breath control structure.
19. A method for generating a mode control structure to control a ventilator pneumatic system comprising:
AMENDED SHEET ARTICL 19) a) providing a first set of breath parameters, each breath parameter within the first set of breath parameters including at least one of a control or alarm setting, b) providing user selected inpαt values to define the at least one of the control or alarm setting for one or more breath parameters within the first set of breath parameters; and c) creating a first breath control structure from the first set of breath parameters; d) repeating steps a) to c) for a second set of breath parameters to create a second breath control structure; and e) combining the first and second breath control structures to form a mode control structure f) simultaneously adjusting a plurality of controls within a ventilator pneumatic system in response to the mode control structure.
20. A method for providing a therapy to a patient connected to a ventilator pneumatic system comprising: providing a first mode control structure including a plurality of breath control structures and a second mode control structure including a plurality of breath control structures, controlling a plurality of controls within a ventilator pneumatic system using the first mode control structure; measuring one or more therapy parameters; simultaneously adjusting the plurality of controls within a ventilator pneumatic system using the second mode control structure when one or more parameters exceed predetermined trigger values.
21. The method of claim 20 wherein a therapy parameter comprises at least one of a time measurement and a characteristic of the patient' s pulmonary system.
22. A method for controlling a ventilator pneumatic system comprising. providing a database including a plurality of patient protocols, each patient protocol comprising a set of breath parameters and patient data; accessing the database to select a patient protocol; - 47 -
loading a processor with the selected patient protocol: and adjusting a plurality of controls within the ventilator pneumatic system using the selected patient protocol.
23. The method of claim 22 wherein each breath parameter comprises at least one of a control setting and an alarm setting.
24. The method of claitα 22 further comprising predicting the status ofthe patient's pulmonary system prior to adjusting the plurality of controls by simulating adjusting the plurality of controls within the ventilator pneumatic system in response to the set of breath parameters; and simulating a response of the patient's pulmonary system to the adjustment to the plurality of controls within the ventilator pneumatic system.
25. The method of claim 24 further comprising displaying software-generated images representing the predicted status ofthe patient's pulmonary system and the set of breath parameters on a display.
26. The method of claim 25 further comprising adjusting the plurality of controls within the ventilator pneumatic system based on the predicted status ofthe patient's pulmonary system and the set of breath parameters displayed on the display.
27. The method of claim 22 wherein the accessing step further comprises searching the database to select a desired patient protocol
28. The method of claim 22 further comprising displaying software-generated images representing status o the patient' . pulmonary system and the set of breath parameters on a display.
29. A ventilator control system for controlling a ventilator pneumatic system comprising; a database which includes a plurality of patient protocols, each patient protocol comprising a set of breath parameters and patient data; a user interface for accessing the database to select a patient protocol; and - 48 -
a processor electrically coupled to the user interface for receiving the selected patient protocol, the processor simultaneously adjusting a plurality of controls within the ventilator pneumatic system using the selected patient protocol.
30. The venlilator control sj'Stem of claim 29 further comprising a display on which software-generated images representing status ofthe patient's pulmonary system and the set of breath parameters are displayed.
31. The ventilator control system of claim 30 wherein the user interface further comprises a touch-sensitive screen disposed over the display for manipulating one or more breath parameters.
32. A method for providing an assisted phase of a breath to a patient connected to a ventilator pneumatic system comprising: monitoring an accumulated volume of gas inhaled by the patient resulting from the patient's spontaneous respiratory muscle activity; comparing the measured accumulated volume to a trigger volume; and adjusting the plurality of controls witnin the ventilator pneumatic system when the measured accumulated volume exceeds the trigger volume to provide an assisted phase of a breath.
33 The method of claim 32 wherein the monitoring step further comprises: measurmg a flow of gas inhaled by the patient resulting from the patient' s spontaneous respiratory muscle activity; and integrating the flow to provide the measured accumulated volume.
34. A method of compensating for gas flow resistance into and out ofthe lungs of a patient connected to a ventilator pneumatic system comprising: providing a resistance parameter, measuring the gas flow resistance into and out ofthe lungs of a patient during an inspiration phase, an exhalation phase and a post-breath phase of a breath; and selectively adjusting one or more controls on the ventilator pneumatic system to compensate for the measured resistance during any one or more ofthe inspiration, exhalation, or a post-breath phases of the breath. - 49 -
35. A method for controlling a ventilator pneumatic system comprising: providing a set of breath parameters for controlling the ventilator pneumatic system, the set of breath parameters including at least one range parameter; displaying an integrated software-generated image representing a controllable high alaπn level, a controllable low alarm level, a controllable nominal operating value, a controllable operating range for the range parameter, and a controllable target value for a measured characteristic ofthe patient's pulmonary system, setting the high alarm level to a maximum allowable value for the range parameter; setting the low alarm level a minimum allowable value for the range parameter; setting the nominal operating value for the range parameter; setting the operating range to a range of allowable operating values relative to the nominal operating value for the range parameter, specifying the target value; and adjusting a plu lity of controls within a ventilator pneumatic system in response tbe set of breath parameters; adjusting the operating value ofthe range parameter within the operating range; and further adjusting the controls within the ventilator pneumatic system in response to changes in the operating value of the range parameter to achieve the target value.
36. A method of manipulating a breath parameter represented as a software- generated image displayed on a touch-sensitive display comprising: dynamically defining an touch zone on the touch-sensitive display; forming a software-generated image of a breath parameter within a subsection ofthe touch zone; receiving a touch signal when a user touches any location within the touch zone; and - 50 -
manipulating the image of the breath parameter in response to the touch signal.
37. A method of displaying historical status of the pulmonary system of a patient connected to a ventilator pneumatic system comprising: defining a measurement period of one minute; providing a plurality of breath parameters having user defined target values and actual values, the breath parameters including minute volume, inspiration phase, exhalation phase, inspiration/exhalation ratio, breathing rate, spontaneous minute volume, inhale tidal volume, exhale tidal volume, leakage; measuring the actual values during the measurement period; generating an integrated graphic for displaying the input values and actual values o the plurality of breath parameters on a display, including a) representing target minute volume as a circle having an area corresponding to the user defined target value of the minute volume; b) representing actual minute volume as a semi-transparent circle disposed over the target minute volume circle and having an area corresponding to the actual value, c) representing target inspiration and exhalation phases as interspersed wedges within the target minute volume circle, wherein a target inspiration phase and a target exhalation phase form a target breath, and d) representing measured inspiration and exhalation phases as interspersed semi-transparent wedges disposed over the target inspiration and exhalation phase wedges and having an area corresponding to the actual value, wherein a measured inspiration phase and a measured exhalation phase form a measured breath; and periodically updating the input values and measured values included in the graphic once per minute.
38. The method of claim 37 further comprising representing the inspiration/exhalation ratio and breathing rate as numerical values in the integrated graphic. - 51 -
39. The method of claim 37 further comprising representing the spontaneous minute volume, inhale tidal volume, exhale tidal volume and leakage as numerical values in the integrated graphic.
PCT/US1996/019382 1995-12-08 1996-12-05 Ventilator control system and method WO1997020592A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU12802/97A AU1280297A (en) 1995-12-08 1996-12-05 Ventilator control system and method
EP96943601A EP0873150A1 (en) 1995-12-08 1996-12-05 Ventilator control system and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/569,919 1995-12-08
US08/569,919 US5931160A (en) 1995-12-08 1995-12-08 Ventilator control system and method

Publications (3)

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WO1997020592A1 WO1997020592A1 (en) 1997-06-12
WO1997020592B1 true WO1997020592B1 (en) 1997-07-10
WO1997020592A9 WO1997020592A9 (en) 1997-10-09

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US (1) US5931160A (en)
EP (3) EP2201978A3 (en)
AU (1) AU1280297A (en)
DE (1) DE69638169D1 (en)
WO (1) WO1997020592A1 (en)

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