Method and system for providing safe patient monitoring in an electronic medical device while serving as a general-purpose windowed display

• US 5,482,050 A
• Filed: 02/17/1994
• Issued: 01/09/1996
• Est. Priority Date: 02/17/1994
• Status: Expired due to Term

• Current Assignee: Spacelabs Healthcare LLC (OSI Systems Incorporated)
• Original Assignee: Spacelabs Medical Incorporated (OSI Systems Incorporated)
• Inventors: Horsley, Erik R., Smokoff, Timothy L.
• Primary Examiner(s): Huntley, David M.
• Assistant Examiner(s): Thomas, Joseph
• Application Number:
  US08/198,100
• Time in Patent Office: 691 Days
• Field of Search: 364/413.01, 364/413.02, 364/413.03, 364/413.04, 364/413.05, 364/413.06, 364/413.07, 364/413.1, 364/413.11, 395/157, 395/158, 395/650, 395/140, 395/159, 395/161, 340/825.32, 340/825.5, 340/825.51, 345/133, 128/710, 128/712, 128/661.03, 128/660.04
• US Class Current: 600/523
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61B 5/339 Displays specially adapted therefor

Abstract

A method and system for providing safe patient monitoring in an electronic medical device while serving as a general-purpose windowed display is provided. In a preferred embodiment, an electronic medical device is capable of providing services to executing programs in response to requests for services from executing programs. These requests for services each specify a service to be provided. The electronic medical device ensures the integrity of an executing patient monitoring program while simultaneously providing services to a non-patient monitoring program that is executing. The electronic medical device provides the service specified by each request for services from the executing patient monitoring program and declines to provide services as they are specified by requests for services from the executing nonpatient monitoring program if provision of the service as specified would interfere with the executing patient monitoring program. In one embodiment, the electronic medical device omits to provide any service in response to a request for services from the executing non-patient monitoring program that specifies a service that would interfere with the executing patient monitoring program. In one embodiment, the electronic medical device provides a service specified by the executing non-patient monitoring program in a manner different from that specified in the request for services, where the service provided in the different manner does not interfere with the executing patient monitoring program.

Claims

1. In an electronic medical device capable of providing services to executing programs in response to requests for services from executing programs, the requests for services specifying a service to be provided, a method for ensuring the integrity of an executing patient monitoring program while simultaneously providing services to an executing non-patient monitoring program, the method comprising the steps of:

executing the patient monitoring program;

providing the service specified by each request for services from the executing patient monitoring program;

executing the non-patient monitoring program; and

declining to provide services as specified by requests for services from the executing non-patient monitoring program if provision of the service as specified would interfere with the executing patient monitoring program,

wherein at least a portion of the requests for services from executing programs specify a window display service for displaying a window containing output from the requesting application, the displayed window having an area, and wherein, for these requests, the declining step is accomplished by the steps of;

providing the window display service specified by the executing non-patient monitoring program;

detecting an alarm condition; and

upon detecting the alarm condition, if the displayed window has an area greater than a threshold area, reducing the area of the displayed window.

2. The method of claim 1 wherein the step of declining to provide services is accomplished by omitting to provide any service in response to a request for services from the executing non-patient monitoring program that specifies a service that would interfere with the executing patient monitoring program.

3. The method of claim 2 wherein the electronic medical device has a display device having a display area, and wherein at least a portion of the requests for services from executing programs specify a display service for displaying specified output within the display area, and wherein the providing step is accomplished by displaying the output specified by the request in a location within the display area that is substantially the same as the location specified by the request, and wherein the step of omitting to provide any service that would interfere with the executing patient monitoring program by omitting to display the output specified by the request if the display of the output specified by the request would interfere with the display of output by the executing patient monitoring program.

4. The method of claim 2 wherein the electronic medical device maintains a patient monitoring program color mapping table for mapping virtual color values used by the executing patient monitoring program to real color values, and wherein at least a portion of the requests for services from executing programs specify a patient monitoring program color mapping table alteration service for altering the real color value to which a specified virtual color value used by the executing patient monitoring program maps in the patient monitoring program color mapping table, and wherein the providing step responds to requests specifying the patient monitoring program color mapping table alteration service from the executing patient monitoring program by altering the real color value to which a specified virtual color value used by the executing patient monitoring program maps in the patient monitoring program color mapping table, and wherein the step of omitting to provide any service that would interfere with the executing patient monitoring program is accomplished by responding to requests specifying the patient monitoring program color mapping table alteration service from the executing non-patient monitoring program by omitting to alter the real color value to which the specified virtual color value used by the executing patient monitoring program maps in the patient monitoring program color mapping table.

5. The method of claim 1 wherein requests for services from executing programs further specify, a manner in which the services to be provided, and wherein the step of declining to provide services is accomplished by adaptively providing a service specified by the executing non-patient monitoring program in a manner different from that specified in the request for services that does not interfere with the executing patient monitoring program.

6. The method of claim 5 wherein the electronic medical device has a display device having a display area, and wherein at least a portion of the requests for services from executing programs specify a display service for displaying specified output at a specified location within the display area, and wherein the providing step is accomplished by displaying the output specified by the request in a location within the display area that is substantially the same as the location specified by the request, and wherein the adaptively providing step is accomplished by displaying the output specified by the request in a location within the display area that is as close to the location specified by the request as is possible without interfering with the display of output by the executing patient monitoring program.

7. The method of claim 5 wherein the electronic medical device maintains a patient monitoring program color mapping table for mapping virtual color values used by the executing patient monitoring program to real color values, and wherein at least a portion of the requests for services from executing programs specify a patient monitoring program color mapping table alteration service for altering the real color value to which a specified virtual color value used by the executing patient monitoring program maps in the patient monitoring program color mapping table, and wherein the electronic medical device also maintains a non-patient monitoring program color table for mapping virtual color values used by the executing non-patient monitoring program to real color values, and wherein the providing step responds to requests specifying the patient monitoring program color mapping table alteration service from the executing patient monitoring program by altering the real color value to which a specified virtual color value used by the executing patient monitoring program maps in the patient monitoring program color mapping table, and wherein the adaptively providing step is accomplished by responding to requests specifying the patient monitoring program color mapping table alteration service from the executing non-patient monitoring program by altering the real color value to which a specified virtual color value used by the executing non-patient monitoring program maps in the non-patient monitoring program color mapping table.

8. The method of claim 5 wherein at least a portion of the requests for services from executing programs specify a user input capture service for capturing substantially all of the input provided by a user, and wherein requests for services that specify the user input capture service also specify a user input capture duration, and wherein the providing step is accomplished by providing the user input capture service for the specified user input capture duration, and wherein the adaptively providing step is accomplished by providing the user input capture service for a duration not exceeding a predetermined maximum duration.

9. The method of claim 5 wherein the adaptively providing step is accomplished by the steps of:

providing the service specified by the executing non-patient monitoring program;

detecting a run-time error during the provision of the service; and

upon detecting the run-time error, ceasing to provide the service specified by the executing non-patient monitoring program.

10. The method of claim 9 wherein the ceasing to provide step is accomplished by resetting the electronic medical device.

11. The method of claim 1 wherein the step of reducing the area of the displayed window includes the step of iconifying the displayed window.

12. In an electronic medical device having a microprocessor, a display device, and an input device, the display device having a display area, a method for ensuring the integrity of the display of the output of patient monitoring programs while simultaneously displaying the output of additional executing programs, the additional programs being capable of capturing input from the input device, the method comprising the steps of:

limiting the duration of input capture by any of the additional programs;

using an additional program display color mapping table that is modifiable by the additional programs to display the output of the additional programs and a separate patient monitoring program display color mapping table that is modifiable by the patient monitoring programs and unmodifiable by the additional programs to display the output of the patient monitoring programs;

preventing the display of the output of the additional programs in predefined protected regions within the display area;

in response to receiving a normal screen command, redisplaying the contents of the display area in a preselected standard organization;

in response to a request from the executing additional program, displaying a window for containing output or the executing additional program;

detecting an alarm condition; and

upon deleting the alarm condition, if the displayed window has an area greater than a threshold area reducing the area of the displayed window.

13. The method of claim 12, further including the steps of:

detecting a run-time error while displaying the output of an executing program; and

clearing the detected run-time error.

14. The method of claim 12, further including the step of limiting the number of additional programs that may display information in the display area to a predetermined maximum number of additional programs.

15. The method of claim 14 wherein the limiting step includes the steps of:

in response to a request to display the output of one of the additional programs, comparing the number of the additional programs presently executing to the predetermined maximum number of the additional programs;

approving the request to display the output of one of the additional programs; and

if the number of the additional programs presently executing is not less than the predetermined maximum number of additional programs, iconifying the output displayed in accordance with an earlier-approved request to display the output of one of the additional programs.

16. The method of claim 12 wherein the display area is comprised of pixels, each of the pixels being periodically refreshed with a real color value, and wherein the step of using separate display color mapping tables to display the output of the patient monitoring programs and the output of the additional programs includes steps of:

when a pixel in the display area to be refreshed, reading an attribute portion of the pixel representation corresponding to the pixel that is to be refreshed;

selecting one of a plurality of available color mapping tables based upon the read attribute portion of a virtual color value, each of the available color mapping tables mapping a virtual color value to a real color value;

reading a virtual color value portion of the pixel representation containing a virtual color value;

using the selected color mapping table to map the virtual color value of the read virtual color value portion of the pixel representation to a real color value; and

refreshing the pixel using the real color value.

17. The method of claim 12 wherein the step of preventing the display of the output of the additional programs in predefined protected regions within the display area includes the steps of:

receiving a display request to display specified output of one of the additional programs in a specified target region within the display;

determining whether the specified target region of the received request intersects a protected region;

if the specified target region of the received request intersects a protected region;

identifying an alternate target region within the display that is near the specified target region and that does not intersect any protected region, and

causing the specified output to be displayed in the alternate target region; and

if the specified target region of the received request intersects no protected regions, causing the specified output to be displayed in the specified target region.

18. In an electronic medical device having both a microprocessor and a display device, the display device having a display area, a method for ensuring the integrity of the display of the output of patient monitoring programs while simultaneously displaying the output of additional executing programs by limiting the number of the additional programs that may display information in the display area to a predetermined maximum number of additional programs, the method comprising the steps of:

in response to a request to display the output of one of the additional programs, comparing the number of the additional programs presently executing to the predetermined maximum number of additional programs;

approving the request to display the output of one of the additional programs;

if the number of the additional programs presently executing is not less than the predetermined maximum number of additional programs, iconifying the output displayed in accordance with an earlier-approved request to display the output of one of the additional programs;

in response to the approving step, displaying the additional program output in a section of the display area;

detecting an alarm condition; and

upon detecting the alarm condition reducing the area of the section of the display area in which the additional program output is displayed.

19. In an electronic medical device upon which programs may execute, the display device having a display area, a method for ensuring the integrity of the display of the output of patient monitoring programs while simultaneously displaying the output of additional executing programs by preventing the display of the output of the additional programs in predefined protected regions within the display area, the method comprising the steps of:

receiving a display request to display specified output of one of the additional programs in a specified target region within the display;

determining whether the specified target region of the received request intersects a protected region;

if the specified target region of the received request intersects a protected region;

identifying an alternate target region within the display that is near the specified target region and that does not intersect any protected region, and

causing the specified output to be displayed in the alternate target region;

if the specified target region of the received request intersects no protected regions, causing the specified output to be displayed in the specified target region;

detecting an alarm condition; and

upon detecting the alarm condition, if the displayed specified output has an area greater than a threshold area, reducing the area of the displayed specified output.

20. An electronic medical device capable of executing and displaying output for both patient monitoring programs and additional programs, the electronic medical device comprising:

a display device having a display area in which output for both patient monitoring programs and additional programs is displayed;

a memory for storing the patient monitoring programs and the additional programs;

a processor for executing the patient monitoring programs arid the additional programs;

a display interface for displaying visual output in the display area of the display device that uses an additional program display color mapping table that is modifiable by the additional programs to display the output of the additional programs and a separate monitoring program display color mapping table that is modifiable by the patient monitoring programs and unmodifiable by the additional programs to display the output of the patient monitoring programs;

a display regulator for preventing the display of the output of the additional programs in predefined protected regions within the display area;

a screen reorganizer for redisplaying the contents of the display area in a preselected standard organization in response to receiving a normal screen command; and

an alarm condition message protector for reducing the size of windows displayed on the display device in response to the display of an alarm condition message on the display device in order to ensure the visibility of the alarm condition message.

21. The electronic medical device of claim 20, further including:

an input device from which input is received; and

an input capture limiter for limiting the duration of any capture of input from the input device by an additional program.

22. The electronic medical device of claim 20, further including a processor watchdog for detecting and correcting the lockup of the processor.

23. The electronic medical device of claim 20 wherein the display regulator includes an additional program display limiter for limiting the number of additional programs that may simultaneously display output within the display area.

24. An electronic medical device capable of displaying output for both patient monitoring programs and additional programs, the electronic medical device comprising:

a display device having a display area in which output for both patient monitoring programs and additional programs is displayed;

a network connection for connecting via a network to a remote computer system for storing and executing the patient monitoring programs and the additional programs;

a display interface for displaying visual output in the display area of the display device that uses an additional program display color mapping table that is modifiable by the additional programs to display the output of the additional programs and a separate patient monitoring program display color mapping table that is modifiable by the patient monitoring programs and unmodifiable by the additional programs to display the output of the patient monitoring programs;

a processor regulator for inhibiting the monopolization of program execution resources of the remote computer system by any of the additional programs;

a display regulator for preventing the display of the output of the additional programs in predefined protected regions within the display area;

a screen reorganizer for redisplaying the contents of the display area in a preselected standard organization in response to receiving a normal screen command; and

an alarm condition message protector for reducing the size of windows displayed on the display device in response to the display of an alarm condition message on the play device in order to ensure the visibility of the alarm condition message.

25. In an electronic medical device, a method for ensuring the integrity of an executing patient monitoring program while simultaneously providing services to an executing non-patient monitoring program, the method comprising the steps of:

in response to a request from the executing non-patient monitoring program, displaying a window for containing output of the executing non-patient monitoring program;

detecting an alarm condition; and

upon detecting the alarm condition, if the displayed window has an area greater than a threshold area, reducing the area of the displayed window.

26. The method of claim 25 wherein the step of reducing the area of the displayed window includes the step of iconifying the displayed window.

27. An electronic medical device capable of executing and displaying output for both patient monitoring programs and additional programs, the electronic medical device comprising:

a display device having a display area in which output for both patient monitoring programs and additional programs is displayed;

a memory for storing the patient monitoring programs and the additional programs;

a processor for executing the patient monitoring programs and the additional programs; and

an alarm condition message protector for reducing the size of windows displayed on the display device in response to the display of an alarm condition message on the display device in order to ensure the visibility of the alarm condition message.