Monitoring hand hygiene

• US 9,000,926 B2
• Filed: 05/27/2011
• Issued: 04/07/2015
• Est. Priority Date: 05/27/2010
• Status: Active Grant

• Current Assignee: Infrared Integrated Systems, Ltd. (Fortive Corp.)
• Original Assignee: Infrared Integrated Systems, Ltd. (Fortive Corp.)
• Inventors: Johnson, Neil, Cross, Nicola, Hollock, Stephen
• Primary Examiner(s): Phan, Hai
• Assistant Examiner(s): Wu, Zhen Y
• Application Number:
  US13/118,127
• Publication Number:
  US 20110291841A1
• Time in Patent Office: 1,411 Days
• Field of Search: 340/573.1, 340/574.3, 340/539.13, 340/521, 250/338.3, 382/103
• US Class Current: 340/573.1
• CPC Class Codes: G08B 21/245 Reminder of hygiene compliance policies, e.g. of washing hands

Abstract

A method of monitoring hand washing by individuals comprises monitoring the movements of individuals in an area using one or more sensors, identifying the performance of an act by an individual that requires the hands of the individual to be washed and determining whether the hands of the individual are washed after the performance of the act, wherein the determining includes tracking the motion of that individual using the one or more sensors. Sensors comprising arrays of thermal detectors are preferred, but other types of sensor could be included.

Claims

1. A method of monitoring hand washing by individuals, the method comprising:

monitoring movements of individuals in an area using at least one sensor;

identifying a performance of an act by one of the individuals that requires hands of the one of the individuals to be washed before or after the performance of the act; and

determining whether the hands of the one of the individuals are washed,

wherein the at least one sensor comprises a low resolution two dimensional array of pyroelectric detectors having a sufficient number of elements to track movement of the one of the individuals in the area and communicates with a state estimation system for outputting information comprising estimates of a state of the individuals monitored by the at least one sensor, and

wherein the method further comprises processing signals from the pyroelectric detectors and said state estimation system performing a group of actions comprising;

tracking a motion of the one of the individuals using a tracking algorithm which retains in a memory knowledge of a location of an individual when the individual remains motionless and disappears from an image of the at least one sensor such that the location of the individual is picked up when the individual moves again,

providing an indication that the one of the individuals has performed an act that requires that hand washing, and

providing an indication that the one of the individuals has performed the hand washing.

2. The method as claimed in claim 1, wherein the actions of the one of the individuals that has performed the act requiring the hand washing are tracked to determine whether the hands of a same individuals are washed.

3. The method as claimed in claim 1, wherein one or more of the at least one sensor is sensitive only to movements taking place within a field of view of the one or more of the at least one sensor.

4. The method as claimed in claim 1, wherein each of the two dimensional array of pyroelectric detectors comprises no more than 10,000 detector elements.

5. The method as claimed in claim 1, wherein that at least one sensor uses image difference processing to determine a position of objects in a field of view of the at least one sensor.

6. The method as claimed in claim 1, wherein, if the one of the individuals spends more than a preset minimum amount of time at a hand washing station, the method further comprises determining that the hands of the one of the individuals have been washed.

7. The method as claimed in claim 1, further comprising processing signals from one or more dispensers of cleanser to identify that the hands of the one of the individuals are washed.

8. The method as claimed in claim 1, further comprising incrementing a compliance counter for each determination that the one of the individuals has performed the act that requires the hands to be washed is preceded or followed by a hand washing operation according to requirements associated with the act.

9. The method as claimed in claim 1, further comprising incrementing a non-compliance counter for each determination that one of the individuals has performed the act is not followed by or preceded by a hand washing operation according to the requirements of the act.

10. The method as claimed in claim 1, further comprising separately identifying multiple different acts that require the hands of the one of the individuals to be washed.

11. The method as claimed in claim 1, wherein the area includes multiple hand washing stations wherein hand washing operations at respective hand washing stations are separately determined.

13. The method as claimed in claim 1, wherein the two dimensional array of pyroelectric detectors is at least a 16-by-16 array of detector elements and no more than 33-by-33 array of detector elements.

12. The method of claimed 1, wherein the two dimensional array of pyroelectric detectors has at least 200 detector elements and no more than 2,000 detector elements.

14. A system for monitoring hand washing by individuals by monitoring movements of individuals in an area, identifying a performance of an act by one of the individuals that requires hands of the one of the individuals to be washed before or after the performance of the act, and determining whether the hands of the one of the individuals are washed, the system comprising:

at least one sensor comprising a low resolution two dimensional array of pyroelectric detectors having a sufficient number of elements to track movement of individuals in the area;

a state estimation system communicating with the at least one sensor for outputting information comprising estimates of a state of the individuals monitored by the at least one sensor; and

one or more processors configured to process signals from the pyroelectric detectors and said state estimate system performing a group of actions comprising;

tracking a motion of the individuals using a tracking algorithm which retains in memory knowledge of a location of an individual when the individual remains motionless and disappears from an image of the at least one sensor such that the location of the individual is picked up when the individual moves again,

providing an indication that the one of the individuals has performed the act that requires the hand washing, and

providing an indication that the one of the individuals has performed the hand washing.

15. The system as claimed in claim 14, further comprising additional sensors associated with one or more cleanser dispensers.

16. A non-transitory computer readable medium comprising instructions that when executed by one or more processors in a system comprising at least one sensor having a low resolution two dimensional array of pyroelectric detectors having sufficient elements to track movement of individuals in an area and communicating with a state estimation system for outputting information comprising estimates of the state of individuals monitored by the at least one sensor cause the system to:

monitor movements of individuals in an area using the at least one sensor;

identify a performance of an act by one of the individuals that requires hands of the one of the individuals to be washed before or after the performance of the act; and

determining whether the hands of the one of the individuals are washed,

wherein the instructions cause the one or more processors in the system to process signals from the pyroelectric detectors and said state estimation system performing a group of actions comprising;

tracking a motion of the individuals using a tracking algorithm which retains in a memory knowledge of a location of an individual when the individual remains motionless and disappears from an image of the at least one sensor such that the location of the individual is picked up when the individual moves again,

providing an indication that the one of the individuals has performed that act that requires the hand washing, and

providing an indication that the one of the individuals has performed the hand washing.