System and method for preventing keypad entry errors

• US 8,281,041 B2
• Filed: 11/22/2006
• Issued: 10/02/2012
• Est. Priority Date: 11/22/2006
• Status: Active Grant

• Current Assignee: Carefusion 303 Incorporated (Becton, Dickinson & Co)
• Original Assignee: Carefusion 303 Incorporated (Becton, Dickinson & Co)
• Inventors: Butterfield, Robert D.
• Primary Examiner(s): Mamo, Elias
• Application Number:
  US11/562,945
• Publication Number:
  US 20080120437A1
• Time in Patent Office: 2,141 Days
• Field of Search: 710/5
• US Class Current: 710/5
• CPC Class Codes: G06F 3/0233 Character input methods

Abstract

A system and method for processing keystrokes made while operating a medical device to prevent keypad entry errors. The key press-to-press time is monitored and a subsequent key press rejected if the actual key press-to-press time is shorter than a key press-to-press limit. The actual key inactive time between the release of a key and the subsequent press of a key is compared to an inactive time limit. The subsequent key press is rejected if the actual inactive time is shorter than the inactive time limit. Alerts are provided and further key presses are ignored until the operator presses a CLEAR key. The active time of a key press is monitored and compared to an active time limit. If the actual key press active time exceeds the key press active time limit, an alert is provided but the key press is recognized. An adaptive approach is disclosed in which key presses of an operator are monitored and timing limits modified in accordance with the keying patterns of that operator.

Claims

1. A method for preventing keypad entry errors, the method comprising the steps of:

detecting a press and a release of a first key of a keypad having a plurality of keys, the time between the press and the release of the first key being an actual first key active time;

detecting a press and a release of a first subsequent key on the keypad, the time between the press and the release of the first subsequent key being an actual first subsequent key active time;

determining an actual key press-to-press length of time between the press of the first key and the press of the first subsequent key;

determining an actual inactive length of time between the release of the first key and the press of the first subsequent key;

accepting the first key press only if the actual first key active time equals or exceeds a predetermined minimum on-time and the release of the first key precedes the press of the first subsequent key; and

accepting the first subsequent key press only if the actual inactive length of time equals or exceeds a predetermined minimum off-time, the actual key press-to-press length of time equals or exceeds a predetermined value, and the actual first subsequent key active time equals or exceeds the minimum on-time.

2. The method for preventing keypad entry errors of claim 1, further comprising the step of:

providing an active time alert if the actual first key active time exceeds an active time limit.

3. The method for preventing keypad entry errors of claim 2, further comprising recognizing the first key press regardless of the active time alert being provided.

4. The method for preventing keypad entry errors of claim 1, further comprising the step of:

providing press-to-press time alert if the first subsequent key press has been rejected due to the actual key press-to-press time being shorter than the predetermined value.

5. The method for preventing keypad entry errors of claim 4, wherein the press-to-press time alert comprises a visual display prompting an operator making an entry on the keypad to verify the entry.

6. The method for preventing keypad entry errors of claim 4, wherein the press-to-press time alert comprises an audible warning of first subsequent key press rejection.

7. The method for preventing keypad entry errors of claim 4, further comprising the step of:

ignoring further key presses after the press-to-press time alert has been provided until a specified key has been pressed.

8. The method for preventing keypad entry errors of claim 1, further comprising the step of:

providing an alert if the first subsequent key press has been rejected due to the actual inactive length of time being shorter than minimum off-time.

9. The method for preventing keypad entry errors of claim 8, wherein the alert comprises a visual display prompting an operator making an entry on the keypad to verify the entry.

10. The method for preventing keypad entry errors of claim 8, wherein the alert comprises an audible warning of first subsequent key press rejection.

11. The method for preventing keypad entry errors of claim 8, further comprising the step of:

ignoring further key presses after the alert has been provided until a specified key has been pressed.

12. The method for preventing keypad entry errors of claim 2, further comprising the step of:

providing a first subsequent key active time alert if the actual first subsequent key active time exceeds the active time limit.

13. The method for preventing keypad entry errors of claim 1, further comprising the steps of:

determining if the key used to produce a key press is a selected type of key; and

if the type of key being pressed is the selected type, ignoring at least one of the minimum on-time, the minimum off-time, and the predetermined value and not rejecting the key press.

14. The method for preventing keypad entry errors of claim 13, wherein the selected type of key is a navigation key.

15. The method for preventing keypad entry errors of claim 1, further comprising the steps of:

monitoring a plurality of key presses of the keypad;

comparing the monitored key presses to at least one of the time limits minimum on-time, the minimum off-time, and the predetermined value; and

modifying the at least one of the minimum on-time, the minimum off-time, and the predetermined value to which the monitored key presses were compared based on results of the comparison.

16. A method for preventing keypad entry errors, the method comprising the steps of:

detecting a press and a release of a first key of a keypad having a plurality of keys, the time between the press and the release of the first key being an actual first key active time;

providing a first key active time alert if the actual first key active time exceeds an active time limit;

detecting a press and a release of a first subsequent key on the keypad, the time between the press and the release of the first subsequent key being an actual first subsequent key active time;

determining an actual key press-to-press length of time between the press of the first key and the press of the first subsequent key;

providing a key press-to-press alert and rejecting the first subsequent key press if the actual key press-to-press time is shorter than a key press-to-press time limit;

determining an actual inactive length of time between the release of the first key and the press of the first subsequent key; and

providing an inactive length of time alert and rejecting the first subsequent key press if the actual inactive length of time is shorter than an inactive length of time limit;

and

providing a first subsequent key active time alert if the actual first subsequent key active time exceeds the active time limit.

17. The method for preventing keypad entry errors of claim 16, wherein the step of providing a first key active time alert comprises recognizing the first key press regardless of the alert being provided.

18. The method for preventing keypad entry errors of claim 16, wherein the step of providing a first subsequent key active time alert comprises recognizing the first subsequent key press regardless of the alert being provided.

19. The method for preventing keypad entry errors of claim 16, wherein the step of providing a key press-to-press alert comprises providing a visual display warning.

20. The method for preventing keypad entry errors of claim 19, wherein the key press-to-press alert comprises an audible warning.

21. The method for preventing keypad entry errors of claim 16, further comprising the step of ignoring further key presses after the key press-to-press alert has been provided until a specified key has been pressed.

22. The method for preventing keypad entry errors of claim 16, further comprising the step of ignoring further key presses after the inactive length of time alert has been provided until a specified key has been pressed.

23. The method for preventing keypad entry errors of claim 16, further comprising the steps of:

determining if the key used to produce a key press is a selected type of key; and

if the type of key being pressed is a selected type, at least one of the active time limit, the key press-to-press time limit, and the inactive length of time limit is ignored and the key press is not rejected.

24. The method for preventing keypad entry errors of claim 23, wherein the selected type of key is a navigation key.

25. The method for preventing keypad entry errors of claim 16, further comprising the steps of:

monitoring a plurality of key presses of the keypad; and

comparing the monitored key presses to at least one of the active time limit, key press-to-press time limit, and inactive length of time limit; and

modifying the at least one time limit to which the monitored key presses were compared based on results of the comparison.

26. A system for preventing keypad entry errors, the system comprising:

a keypad having a plurality of keys;

a scanning device communicating with the keypad and configured to detect a time of a press of a first key on the keypad, a time of a release of the first key, a time of a press of a first subsequent key on the keypad, and a time of a release of the first subsequent key;

a memory configured to store a key press-to-press limit, a key inactive limit, and a key active limit; and

a processor in communication with the scanning device and the memory, the processor programmed to;

determine an actual key press-to-press length of time between the press of the first key and the press of the first subsequent key;

retrieve the key press-to-press limit from the memory;

reject the first subsequent key press if the actual key press-to-press time is shorter than the key press-to-press limit;

determine an actual key inactive time between the release of the first key and the press of the first subsequent key;

retrieve the key inactive limit from the memory;

reject the first subsequent key press if the actual key inactive time is shorter than the key inactive limit;

determine an actual key active time between the press of the first key and the release of the first key;

retrieve the key active limit from the memory; and

provide an alert if the actual key active time is longer than the key active limit.

27. The system for preventing keypad entry errors of claim 26, wherein the processor is further programmed to:

recognize the first key press regardless of the active time alert being provided.

28. The system for preventing keypad entry errors of claim 26, wherein the processor is further programmed to:

provide an alert if the first subsequent key press has been rejected due to the actual key press-to-press time being shorter than the key press-to-press time limit.

29. The system for preventing keypad entry errors of claim 26, wherein:

the system further comprises a display device; and

the processor is further configured to provide a visual display warning on the display device if the first subsequent key press has been rejected.

30. The system for preventing keypad entry errors of claim 26, wherein:

the system further comprises an audio output device; and

the processor is further configured to provide an audio warning on the audio output device if the first subsequent key press has been rejected.

31. The system for preventing keypad entry errors of claim 26, wherein the processor is further programmed to:

ignore further key presses until a specified key has been pressed if either the actual key press-to-press time is shorter than the key press-to-press limit or the actual key inactive time is shorter than the key inactive limit.

32. The system for preventing keypad entry errors of claim 26, wherein the processor is further programmed to:

determine an actual first subsequent key active time between the press of the first subsequent key and the release of the first subsequent key;

and

provide an alert if the actual first subsequent key active time is longer than the key active limit.

33. The system for preventing keypad entry errors of claim 26, wherein the processor is further programmed to:

determine if the key used to produce a key press is a selected type of key;

if the type of key being pressed is the selected type, the processor ignores one or more of the key press-to-press limit, the key inactive limit, and the key active limit and the key press is not rejected.

34. The system for preventing keypad entry errors of claim 33, wherein the selected type of key is a navigation key.

35. The system for preventing keypad entry errors of claim 26, wherein the processor is further configured to:

monitor a plurality of key presses of the keypad;

compare the monitored key presses to at least one of the key press-to-press limit, the key inactive limit, and the key active limit; and

modify the at least one of the key press-to-press limit, the key inactive limit, and the key active limit to which the monitored key presses were compared based on results of the comparison.