Parameter disturbance response apparatus

• US 6,068,594 A
• Filed: 07/28/1997
• Issued: 05/30/2000
• Est. Priority Date: 07/19/1995
• Status: Expired due to Fees

• Current Assignee: Nellcor Incorporated (Medtronic Plc)
• Original Assignee: Nellcor Incorporated (Medtronic Plc)
• Inventors: Schloemer, David E., Sippel, Jack B. II, Spero, Ronald A., Hoffman, Harold K. Jr.
• Primary Examiner(s): Nasser, Robert L.
• Application Number:
  US08/901,145
• Time in Patent Office: 1,037 Days
• Field of Search: 600/300, 600/301, 600/309, 600/371, 600/372, 600/483, 600/485, 600/490, 600/488
• US Class Current: 600/300
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/7217 of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker

Abstract

This invention provides apparatus for collecting parameter disturbance information from each connected apparatus which can disturb measuring vital signs, and broadcasting a message regarding the disturbance and a coordinating clock signal to all apparatus. Connected sensors susceptible to parameter disturbances identify them from the message and suppress their audible alarm during an interval given in the message. This eliminates false audible alarms caused by such disturbances. The disturbance interval can be extended for later disturbances unless it is a new source or disturbance type and the alarm is already suppressed. A brickwall timer limits the total maximum suppressed interval to a safe maximum. A recovery timer allows a sensor to recover from a parameter disturbance before responding to a subsequent one.

Claims

1. In a patient monitoring system having a plurality of devices wherein at least one of said devices is a PPD generator which creates a PPD event and at least one of said devices is a susceptible sensor which can cause an error condition as a result of said PPD event, the improvement comprising:

notifying means coupled to said plurality of devices for providing an encoded message notifying said at least one susceptible sensor of the identity and characteristics of said PPD event, said characteristics always including at least the PPD event initiation time and duration, and wherein said notifying means is centralized.

2. The improvement according to claim 1, wherein said notifying means is adapted to couple to an additional susceptible sensor.

3. The improvement according to claim 1, wherein said notifying means is adapted to couple to an additional PPD generator.

4. The improvement according to claim 3, wherein said notifying means is adapted to couple to an additional susceptible sensor.

5. A patient monitoring system comprising:

a PPD generator which causes a PPD event;

a susceptible sensor which is susceptible of producing an error as a result of a PPD event; and

notifying means coupled to said plurality of devices for providing an encoded message notifying said at least one susceptible sensor of the identity and characteristics of said PPD event, said characteristics always including at least the PPD event initiation time and duration, and wherein said notifying means is adapted to couple to an additional PPD generator wherein said notifying means is centralized.

6. A patient monitoring system comprising:

a PPD generator which causes a PPD event;

a susceptible sensor which is susceptible of producing an error as a result of a PPD event; and

notifying means coupled to said PPD generator and said susceptible sensor for notifying said susceptible sensor of said PPD event by means of an encoded message containing at least the initiation time and duration of said PPD event, wherein said notifying means is adapted to couple to an additional susceptible sensor wherein said notifying means is centralized.

7. A patient monitoring system comprising:

a first patient monitor having a first visual display, the first monitor including PPD generator which generates a PPD event message in response to a PPD event;

a susceptible second monitor having a second visual display in a housing separate from that of the first monitor, the second monitor being susceptible to producing an error as a result of a PPD event; and

notifying means coupled to said PPD generator and said susceptible second monitor for notifying said susceptible second monitor of said PPD event by means of an encoded message containing at least the initiation time and duration of said PPD event, wherein said notifying means is centralized.

8. A patient monitoring system according to claim 7, said notifying means including means adapted to couple to an additional susceptible monitor.

9. A patient monitoring system according to claim 8, said PPD event message having a disturbance identifier and a disturbance beginning time.

10. Apparatus for monitoring vital signs of a mammal comprising:

a plurality of test apparatus connected to said mammal;

means having input means and output means for respectively receiving messages from each connected test apparatus over said input means and for transmitting all said messages over said output means back to all said connected apparatus;

at least one connected test apparatus being a parameter disturbance apparatus which will disturb at least part of its operation, said parameter disturbance apparatus further comprising;

means for generating parameter disturbance messages comprising a disturbance identification, an indicated beginning time and an estimated duration time;

means for transmitting said disturbance message to said communication means over its said input means;

at least one connected test apparatus being a vital sign sensor apparatus having means for sensing a vital sign and generating a proportional output signal, said output signal being disturbed and inaccurate during the time certain identified parameter disturbances are operating, said vital sign sensing means further comprising;

alarm means for indicating whenever said output signal is outside a predetermined range;

means for receiving said parameter disturbance message generated by said disturbance apparatus from said output means of said communication means;

means for suppressing said alarm means in response to said parameter disturbance message from the indicated beginning through the estimated duration time.

11. Apparatus according to claim 10, wherein said parameter disturbance message further comprises an estimated disturbance duration.

12. Apparatus according to claim 11, wherein said suppressing means suppresses said alarm through said estimated duration time, excepting that a suppression of said alarm shall end earlier when an indicated ending time is received during an estimate duration time, provided further however that said alarm means will be suppressed only if the parameter disturbance identity indicates that the parameter disturbance is one which disturbs the operation of that particular sensing means.

13. Apparatus as in claim 12, wherein the suppression of the alarm is limited to a predetermined maximum time interval.

14. Apparatus as in claim 13, wherein successive parameter disturbance messages received within a predetermined minimum time interval will be ignored.

15. Apparatus as in claim 14, wherein the suppression of an alarm will be extended for a predetermined amount of time after the said alarm has been suppressed.

16. Apparatus as in claim 15, wherein any parameter disturbance message received during the suppression of an alarm of a previous parameter disturbance duration, which indicates an extended estimated parameter disturbance, will extend the parameter disturbance duration as provided in the message, excepting that parameter disturbance messages regarding a new identified disturbance will be ignored whenever the sensor is out of range.

17. Apparatus as in claim 16, wherein each said sensor has first in- first out means for receiving parameter disturbance messages and storing them such that messages received first are made available first, said sensor also having time decrementing means for decrementing of all stored parameter disturbance messages an amount equal to the time that each is stored in said first in- first out means, said sensor further having register means for receiving said messages made available to said sensor from said FIFO for processing.