Lighting system, particularly for delirium reduction in intensive care units

Patent metadata

Field	Value
Publication number	US-2015126806-A1
Application number	US-201314402162-A
Country	US
Kind code	A1
Filing date	May 15, 2013
Priority date	May 24, 2012
Publication date	May 7, 2015
Grant date	—

Abstract

The invention relates to a lighting system ( 100 ) and a method for controlling lighting conditions in a room (R). The lighting system ( 100 ) comprises a controller ( 101 ) for controlling internal light sources ( 121, 122 ) and at least one actuator ( 131, 141 ) for changing the amount of external light entering the room (R). Moreover, at least one sensor ( 111,112, 31,141 ) is provided for detecting a parameter relating to the actual or to a desired lighting level of the room (R). Thus it is possible to control the lighting of the room (R) according to a predetermined schedule, particularly with a circadian rhythm that can reduce delirium in a patient (P). The actuator may for example comprise means ( 141 ) for closing or opening curtains ( 142 ) in front of a window (W).

First claim

1 . A lighting system for controlling lighting conditions in a room (R) for affecting a circadian rhythm of a person (P) in the room, comprising:
at least one sensor for detecting a parameter relating to the actual or to a desired lighting level of the room (R); at least one controllable internal light source that is or can be located in the room (R); at least one actuator for affecting the amount of external light entering the room (R); a controller for controlling the internal light source and the actuator in dependence on i) the readings of the sensor and ii) a lighting schedule, to establish lighting conditions in the room which correspond to a circadian cycle of dark and light periods.

2 . A method for controlling lighting conditions in a room (R) for affecting a circadian rhythm of a person (P) in the room, said method comprising the following steps:
detecting with at least one sensor a parameter relating to the actual or to a desired lighting level of the room (R); controlling an internal light source and the amount of external light entering the room (R) in dependence on i) the readings of the sensor and ii) a lighting schedule, to establish lighting conditions in the room which correspond to a circadian cycle of dark and light periods.

3 . The lighting system according to claim 1 wherein:
the sensor comprises an activity sensor for detecting a state of activity of the person (P); and
said controlling comprises adapting the lighting schedule to said state of activity.

4 . The lighting system or the method according to claim 3 , wherein:
the state of activity is characterized in that the person's eyes are closed; and said adapting comprises prolonging the light period to compensate for the person's eyes being closed during the light period.

5 . The lighting system according to claim 1 ,
characterized in that the sensor comprises at least one sensor selected from the group consisting of: a light sensor, particularly a light sensor that is or can be located adjacent to a bed (B) and/or that can be worn by a patient (P); a door sensor for detecting the opening state of a door (D); a window sensor for detecting the light transmission capability of a window (W); a presence sensor for detecting the presence and/or location of an object of a person (S).

6 . The lighting system according to claim 1 , characterized in that the actuator comprises:
an actuator for changing the light transmission capability of a window (W); an actuator for closing or opening a curtain or blind; a regulator for an electrochromic device; a dimmer for a controllable external light source.

7 . The lighting system according to claim 1 ,
characterized in that the internal light source comprises a lamp and/or a display.

8 . The lighting system according to claim 1 ,
characterized in that it comprises a user interface.

9 . The lighting system according to claim 1 ,
characterized in that at least one source of sound is controlled.

10 . (canceled)

11 . The lighting system or the method according to claim 1 ,
characterized in that the dark periods last for at least seven hours a day and/or that the bright periods last for at least five hours a day.

12 . The lighting system according to claim 1 ,
characterized in that the contributions of the internal light source and of external light are adjusted according to given priority settings.

13 . A computer program product for enabling carrying out a method according to claim 2 .

14 . A record carrier on which a computer program according to claim 13 is stored.

15 . Use of the lighting system according to claim 1 for affecting a circadian rhythm of a subject, particularly for a treatment of delirium, sleeping disorder, and/or jetlag.

16 . Hospital room, in particular an intensive care unit, comprising the lighting system according to claim 1 .

Assignees

• Koninkl Philips Nv

Inventors

• Barroso Andre Melon
• Falck Thomas

Classifications

• A61N2005/0628

  including a radiation sensor · CPC title

• A61N2005/0663

  Coloured light · CPC title

• A61M2205/3306

  Optical measuring means · CPC title

• A61M2205/52

  with memories providing a history of measured variating parameters of apparatus or patient · CPC title

• A61M2021/0083

  especially for waking up · CPC title