Systems and methods for providing sensor fusion

• US 7,539,537 B2
• Filed: 10/03/2003
• Issued: 05/26/2009
• Est. Priority Date: 10/03/2002
• Status: Active Grant

• Current Assignee: Scott Laboratories, Inc.
• Original Assignee: Scott Laboratories, Inc.
• Inventors: Hickle, Randall S.
• Primary Examiner(s): Nasser; Robert L
• Application Number:
  US10/677,481
• Publication Number:
  US 20040111014A1
• Time in Patent Office: 2,062 Days
• Field of Search: 600300-301
• US Class Current: 600/544
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• 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 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02108 from analysis of pulse wave characteristics
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: A61B 5/145 Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissuemeasuring of blood pressure or blood flow A61B5/02; non-radiation detecting or locating of foreign bodies in blood A61B5/06
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/352 Detecting R peaks, e.g. for synchronising diagnostic apparatus; Estimating R-R interval
• CPC Class Codes: A61B 5/363 Detecting tachycardia or bradycardia
• CPC Class Codes: A61B 5/411 Detecting or monitoring allergy or intolerance reactions to an allergenic agent or substance
• CPC Class Codes: A61B 5/4839 combined with drug delivery
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B

Abstract

The present invention comprises a system that incorporates the natural relationships of patient parameters into a medical monitoring system in order to increase monitoring specificity by reducing false positive alarms resulting from spurious data and inconclusive data. The invention also comprises a system that incorporates the natural relationships of patient parameters in order to use the data obtained from those parameters to non-invasively monitor a patient parameter that typically precludes direct monitoring.

Claims

1. A patient monitoring system for a sedation and/or analgesia procedure, comprising:

a first patient health monitor device adapted so as to be coupled to a patient and so as to generate a first signal reflecting a first parameter of a physiological condition of the patient;

a second patient health monitor device adapted so as to be coupled to the patient and so as to generate a second signal reflecting a second parameter of a physiological condition of the patient, wherein said first parameter and said second parameter are interrelated such that said first and said second signal are indicative of a single patient condition associated with said sedation and/or analgesia procedure;

an electronic controller accessing safety parameters for each of said first and second physiological conditions operatively connected to said first and second patient health monitor devices, wherein the electronic controller compares said first and second parameters with said safety parameters so as to initiate a response upon detection of undesirable signals from both of said first and second patient health monitor devices so as to facilitate conservative application of sedative or analgesic drug delivery and/or other suitable effectors, wherein conservative application comprises maintenance or decrease of sedative or analgesic drug delivery, and wherein if the comparison of said first or second parameter with said safety parameters is inconclusive, the electronic controller provides normal system functionality without alerting clinicians while determining whether one patient health monitor device can confirm a potential condition indicated by the other patient health monitor device.

2. The patient monitoring system of claim 1, wherein said first and second patient health monitoring devices are each independently selected from the group consisting of non-invasive blood pressure monitors, pulse oximeters, capnometers, ECGs, patient consciousness assessment systems, ventilatory flow monitors, ventilatory pressure monitors, impedance plethysmographs (IPGs), gas analyzers, ventilatory temperature monitors, ventilatory humidity monitors, and acoustical monitors.

3. The patient monitoring system of claim 1, wherein said response comprises at least one of decreasing drug levels, delivering oxygen, changing drugs, testing patient responsiveness, and delivering positive airway pressure.

4. The patient monitoring system of claim 1, wherein said electronic controller further accesses a third patient parameter and comprises using the monitored data for the first patient parameter and the second patient parameter to calculate said third patient parameter that is compared against said safety parameters for said third patient parameter.

5. A method for employing sensor fusion in a sedation and analgesia system, comprising the following steps:

providing at least one patient monitor corresponding to a first patient parameter and at least one patient monitor corresponding to a second patient parameter, wherein said parameters are interrelated and each of said monitors provide data indicative of a single patient condition associated with use of said sedation and/or analgesia system;

monitoring at least two of said interrelated patient parameters;

ascertaining whether any of said data is indicative of a negative patient episode;

if any of said data is indicative of a negative patient episode, determining whether there is agreement between each monitor, or if any of said data is inconclusive, providing normal system functionality without alerting clinicians while determining whether one monitor can confirm a potential condition indicated by at least one other monitor; and

initiating a suitable procedure in response to said data indicative of a negative patient episode or confirmed potential condition so as to facilitate conservative application of sedative or analgesic drug delivery and/or other suitable effectors, wherein conservative application comprises maintenance or decrease of sedative or analgesic drug delivery.

6. The method of claim 5, wherein said step of ascertaining further comprises comparing said data from each of the monitors against a set of safety parameters.

7. The method of claim 5, wherein said suitable procedure comprises at least one of decreasing drug levels, delivering oxygen, changing said drugs supplied to the patient, testing patient responsiveness, and delivering positive airway pressure.

8. The method of claim 5, wherein said step of determining whether there is agreement between each monitor comprises comparing data from each of said monitors with a respective set of safety parameters.

9. The method of claim 8, wherein said step of determining whether there is agreement between each monitor further comprises evaluating the relationship between said data for said monitored parameters that fall within said set of safety parameters.

10. The method of claim 5, further comprising continuing to gather data from the monitors for a predetermined period of time before said suitable procedure is initiated.

11. The method of claim 5, wherein said first patient parameter comprises electrical heart activity and said second patient parameter comprises pulse oximetry.

12. The method of claim 5, further comprising after said monitoring step, the step of using the monitored data for the first patient parameter and the second patient parameter to calculate a third patient parameter.

13. The method of claim 12, wherein said step of ascertaining further comprises comparing said third patient parameter against a set of safety parameters.

14. A method for employing sensor fusion in a drug delivery system during delivery of a sedative and/or analgesic drug, comprising the following steps:

providing at least one patient monitor corresponding to a first patient parameter and at least one patient monitor corresponding to a second patient parameter, wherein said parameters are interrelated and each of said monitors provide data;

monitoring at least two of said interrelated patient parameters,

ascertaining whether the data from any of said monitors is conclusive of a potentially critical condition;

if data is inconclusive, providing normal system functionality without alerting clinicians while analyzing the data from said first and second patient parameters to determine whether one monitor can confirm the potentially critical condition indicated by at least one other monitor; and

if data is conclusive of a potentially critical condition, alerting clinicians to the detected data and initiating a suitable automated or semi-automated procedure desirable to place the patient into a safe state.

15. The method of claim 14, wherein said data is processed by a controller.

16. The method of claim 15, further comprising the step of ascertaining whether the clarified data is indicative of a negative patient condition based on a set of safety parameters programmed into the controller.

17. The method of claim 14, wherein said suitable procedure comprises at least one of decreasing drug levels, delivering oxygen, changing said drugs supplied to the patient, and delivering positive airway pressure.

18. The method of claim 14, wherein said step of alerting clinicians comprises providing different alarm modes that vary depending on whether the data inconclusively or conclusively indicates the potentially critical condition.

19. The method of claim 14, wherein said first patient parameter comprises capnometry and said second patient parameter comprises ventilatory pressure.

20. The method of claim 14, further comprising after said monitoring step, the step of using the monitored data for the first patient paramater and the second patient parameter to calculate a third patient parameter.

21. The method of claim 20, comprising integrating blood pressure data with pulse oximetry data, where such an interrelation may provide monitoring of the systemic vascular resistance.