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US 9,542,828 B1Granted
System, device, and method for measurement of hand hygiene technique
OwnerPeter D. Haalandinventor
Life of this patent
Estimating the term…
Abstract
A device, system, and method for evaluating compliance with a hand hygiene standard using acceleration measurements of the hand or wrist. The method is based on the scalar quantities vigor and/or rocking angle.
Claims13
A device for monitoring hand hygiene, the device comprising:
- a housing configured to be worn on a user's wrist, the housing including an accelerometer configured to measure acceleration vectors, {right arrow over (a)}(t)={right arrow over (a)}, of the user's wrist projected along three linearly independent axes of motion;
- and
- a processing unit in communication with the accelerometer and configured to
- receive a plurality of the acceleration vector measurements taken over a period of time during a hand hygiene event carried out by the user,
- determine rocking angle values from the plurality of acceleration vector measurements by calculating
- r
-
- (
- t
- )
- =
- cos
- -
- 1
-
- (
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- ·
- 〈
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- 〉
- )
- ,
- the rocking angle values each being a scalar quantity,
- compare the rocking angle values to one or more rocking angle thresholds established at preselected times based on a hand hygiene standard,
- determine if one or more of the rocking angle values meets the one or more rocking angle thresholds, and
- alert the user to a result of the comparison of the rocking angle values to the one or more rocking angle thresholds.
50 more elements
A system for monitoring hand hygiene, the system comprising:
- a plurality of hand hygiene stations, each station including a RFID tag having a unique identification;
- a device worn on a user's wrist, the device including a RFID tag reader and an accelerometer to measure acceleration vectors, {right arrow over (a)};
- and
- a computer processor configured to
- receive the acceleration vectors, {right arrow over (a)} from the device associated with a hand hygiene event at one of the hand hygiene stations,
- determine rocking angle values associated with the user's hand hygiene event from the acceleration vectors, {right arrow over (a)}, the rocking angle values each being a scalar quantity,
- determine if the rocking angle values associated with the hand hygiene event satisfies one or more rocking angle thresholds established at preselected times,
- transmit a first notification to the user if the hand hygiene event satisfies the one or more rocking angle thresholds, and
- transmit a second notification to the user if the hand hygiene event does not satisfy the one or more rocking angle thresholds.
6 more elements
A method of evaluating compliance with a hygiene standard, the method comprising:
- measuring acceleration vectors, {right arrow over (a)}, with an accelerometer applied to one or more of hands, wrists, or forearms during events that comply with the standard;
- measuring acceleration vectors, {right arrow over (a)}, with an accelerometer applied to one or one or more of hands, wrists, or forearms during events that do not comply with the standard;
- determining at least one rocking angle value by calculating
- r
-
- (
- t
- )
- =
- cos
- -
- 1
-
- (
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- ·
- 〈
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- 〉
- )
- for compliant events;
- determining at least one rocking angle value by calculating
- r
-
- (
- t
- )
- =
- cos
- -
- 1
-
- (
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- ·
- 〈
- a
-
- (
- t
- )
- →
-
- a
-
- (
- t
- )
-
- →
- 〉
- )
- for non-compliant events,
- the rocking angle values each being a scalar quantity;
- and
- comparing at least one of the rocking angle values for compliant events and rocking angle values for non-compliant events;
- and
- establishing one or more rocking angle thresholds at preselected times based on the comparison to establish whether compliance is achieved in subsequent events.
94 more elements
Dependencies are inferred from the claim text.