Patient monitoring system

• US 8,907,287 B2
• Filed: 11/29/2011
• Issued: 12/09/2014
• Est. Priority Date: 12/01/2010
• Status: Active Grant

• Current Assignee: Hill-Rom Services Incorporated (Baxter International Inc.)
• Original Assignee: Hill-Rom Services Incorporated (Baxter International Inc.)
• Inventors: Vanderpohl, Irvin J.
• Primary Examiner(s): Sung, Christine
• Application Number:
  US13/305,884
• Publication Number:
  US 20120138801A1
• Time in Patent Office: 1,106 Days
• Field of Search: 250/349
• US Class Current: 250/349
• CPC Class Codes: A61B 2560/0252 using ambient temperature
• CPC Class Codes: A61B 2562/043 in a linear array
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/01 Measuring temperature of body parts ; Diagnostic temperature sensing, e.g. for malignant or inflamed tissue clinical contact thermometers G01K13/20
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1115 Monitoring leaving of a patient support, e.g. a bed or a wheelchair
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/1126 using a particular sensing technique
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/165 Evaluating the state of mind, e.g. depression, anxiety
• CPC Class Codes: A61B 5/6891 Furniture
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 90/36 Image-producing devices or illumination devices not otherwise provided for
• CPC Class Codes: A61G 2203/42 for inclination
• CPC Class Codes: A61G 7/00 Beds specially adapted for nursing; Devices for lifting patients or disabled persons stretchers with facilities for picking up patients or disabled persons A61G1/003
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/20 using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices

Abstract

A patient support apparatus includes a monitoring system having a first detector and a controller. The first detector detects electromagnetic radiation from a first field of view of the first detector and providing a signal indicative of characteristics of the electromagnetic radiation. The controller includes a processor coupled to the first detector and a memory device including instructions that, when executed by the processor, cause the processor to processes the signal from the first detector, translate the signal into an array of data, and evaluate the data in the array to determine characteristics of a patient positioned in the first field of view.

Claims

1. A patient support apparatus comprising

a monitoring system including

a first detector detecting electromagnetic radiation from a first field of view of the first detector and providing a signal indicative of characteristics of the electromagnetic radiation,

a second detector comprising an infrared detector detecting infrared radiation from at least a portion of the first field of view, the second detector providing a signal indicative of characteristics of the infrared radiation, and

a controller including a processor coupled to the first detector, the second detector, and a memory device, the memory device including instructions that, when executed by the processor, cause the processor to process the signals from the first and second detectors, translate each of the signals into an array of data, and evaluate the data in the arrays to determine characteristics of a patient positioned in the first field of view,

wherein a patient is supported on a support plane that intersects an image plane of at least one of the first and second detectors,

wherein the controller corrects the data signal from at least one of the first and second detectors to compensate for variations in the relationship between the support plane and the image plane, and

wherein the patient support apparatus further includes an angle sensor that provides a signal to the controller indicative of the relationship between the support plane and the image plane.

2. The patient support apparatus of claim 1, wherein the first detector comprises an infrared detector.

3. The patient support apparatus of claim 1, wherein the first detector comprises a detector capable of detecting visible light.

4. The patient support apparatus of claim 1, wherein the memory device includes instructions that when executed by the processor cause the processor to monitor the signal from the second detector, translate the signal from the second detector into an array of data, and evaluate the data in the array to determine characteristics of a patient positioned in the first field of view.

5. The patient support of claim 4, wherein the memory device includes instructions that, when executed by the processor, cause the processor to monitor the signal from the second detector to translate the signal received into a patient temperature.

6. The patient support apparatus of claim 5, wherein the translation of the signal into a patient temperature includes calibrating signal to compensate for heat loss at the patient'"'"'s skin.

7. The patient support apparatus of claim 4, wherein the data array from the first detector is used to target a boundary in the first field of view, the boundary in the first field of view being used to determine a target area for the collection of data from the second detector.

8. The patient support apparatus of claim 7, wherein the data array from either the first detector or the second detector is a time series of data.

9. The patient support apparatus of claim 8, wherein the memory device includes instructions that, when executed by the processor, cause the processor to evaluate characteristics of the patient at a first time and evaluate characteristics of the patient at a second time.

10. The patient support apparatus of claim 9, wherein the characteristic of the patient at a second time is compared to the characteristic of the patient at the first time to determine if changes in the characteristics of the patient exceed a threshold.

11. The patient support apparatus of claim 10, wherein the threshold is related to excessive patient movement.

12. The patient support apparatus of claim 11, wherein the patient movement is determined as a mean of the magnitude of movements over a period of time.

13. The patient support apparatus of claim 11, wherein the patient movement is determined as a mean of the variation from a common point over a plurality of time intervals.

14. The patient support apparatus of claim 11, wherein the threshold related to excessive patient movement is a velocity threshold.

15. The patient support apparatus of claim 11, wherein the patient movement is used to determine if a patient is conscious.

16. The patient support apparatus of claim 11, wherein the patient movement is used to determine if a patient is agitated.

17. The patient support apparatus of claim 11, wherein the system considers the movement information to determine if a patient has exited the patient support apparatus.

18. The patient support apparatus of claim 9, wherein the characteristic of the patient at a second time is compared to the characteristic of the patient at a first time to determine a respiration rate of the patient.

19. The patient support apparatus of claim 4, wherein an infrared detector includes an internal reference for calibrating the data received by the infrared detector to account for any ambient temperature.

20. The patient support apparatus of claim 19, wherein the translation of the signal into a patient temperature includes calibrating the signal to compensate for the ambient temperature.

21. The patient support apparatus of claim 1, wherein the characteristic of the patient positioned in the first field of view includes a centroid of the patient related data in the field of view and the controller determines whether the centroid is positioned within an acceptable boundary on the patient support apparatus.

22. A patient support apparatus comprising

a monitoring system including

a first detector detecting electromagnetic radiation from a first field of view of the first detector and providing a signal indicative of characteristics of the electromagnetic radiation,

a second detector coupled to the processor, the second detector comprising an infrared detector detecting infrared radiation from at least a portion of the first field of view, the second detector providing a signal indicative of characteristics of the infrared radiation, and

a controller including a processor coupled to the first detector and a memory device including instructions that, when executed by the processor, cause the processor to processes the signals from the first and second detectors, translate the each of the signals into an array of data, and evaluate the data in the arrays to determine characteristics of a patient positioned in the first field of view,

wherein the memory device includes instructions that when executed by the processor cause the processor to monitor the signal from the second detector, translate the signal from the second detector into an array of data, and evaluate the data in the array to determine characteristics of a patient positioned in the first field of view,

wherein the data array from the first detector is used to target a boundary in the first field of view, the boundary in the first field of view being used to determine a target area for the collection of data from the second detector,

wherein the data array from either the first detector or the second detector is a time series of data,

wherein the memory device includes instructions that, when executed by the processor, cause the processor to evaluate characteristics of the patient at a first time and evaluate characteristics of the patient at a second time,

wherein the characteristic of the patient at a second time is compared to the characteristic of the patient at a first time to determine a respiration rate of the patient, and

wherein the respiration rate is determined by calculating the time interval between peak temperatures at a target location.

23. A patient support apparatus comprising

a monitoring system including

a first detector detecting electromagnetic radiation from a first field of view of the first detector and providing a signal indicative of characteristics of the electromagnetic radiation,

a second detector coupled to the processor, the second detector comprising an infrared detector detecting infrared radiation from at least a portion of the first field of view, the second detector providing a signal indicative of characteristics of the infrared radiation, and

a controller including a processor coupled to the first detector and a memory device including instructions that, when executed by the processor, cause the processor to processes the signals from the first and second detectors, translate the each of the signals into an array of data, and evaluate the data in the arrays to determine characteristics of a patient positioned in the first field of view,

wherein the memory device includes instructions that when executed by the processor cause the processor to monitor the signal from the second detector, translate the signal from the second detector into an array of data, and evaluate the data in the array to determine characteristics of a patient positioned in the first field of view,

wherein the data array from the first detector is used to target a boundary in the first field of view, the boundary in the first field of view being used to determine a target area for the collection of data from the second detector,

wherein the data array from either the first detector or the second detector is a time series of data,

wherein the memory device includes instructions that, when executed by the processor, cause the processor to evaluate characteristics of the patient at a first time and evaluate characteristics of the patient at a second time,

wherein the characteristic of the patient at a second time is compared to the characteristic of the patient at a first time to determine a respiration rate of the patient, and

wherein the respiration rate is determined by calculating the time interval between minimum temperatures at a target location.