Bed-leaving sensor and bed-leaving detection method

Patent metadata

Field	Value
Publication number	US-2016007886-A1
Application number	US-201514862651-A
Country	US
Kind code	A1
Filing date	Sep 23, 2015
Priority date	Jun 28, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

A bed-leaving sensor for detecting bed-leaving by a user on a bed, including: a sitting position detection member that detects a sitting position of the user based on a detection value of a pressure sensor arranged on the bed; a foot movement detection member for detecting foot movement of the user based on the detection value of the pressure sensor; and a bed-leaving behavior detection member that detects bed-leaving behavior of the user with the sitting position or the foot movement being detected within a preset bed-leaving expectation region as a condition.

First claim

What is claimed is:

1 . A bed-leaving sensor for detecting bed-leaving by a user on a bed, comprising:
a sitting position detection member that detects a sitting position of the user based on a detection value of a pressure sensor arranged on the bed; a foot movement detection member for detecting foot movement of the user based on the detection value of the pressure sensor; and a bed-leaving behavior detection member that detects bed-leaving behavior of the user with the sitting position or the foot movement being detected within a preset bed-leaving expectation region as a condition.

2 . The bed-leaving sensor according to claim 1 , wherein the bed-leaving expectation region is set to be a foot side region on the bed.

3 . The bed-leaving sensor according to claim 1 , wherein the pressure sensor is arranged only at a bed-leaving possibility region on the bed.

4 . The bed-leaving sensor according to claim 1 , wherein the sitting position detection member sets a determination area in a periphery of a pressure sensing center of a region in which pressure of a given contact threshold value or greater is detected within a preset sitting position determination region on the pressure sensor, and the sitting position is detected based on a ratio of a total pressure detected within the determination area occupying a total pressure detected within the sitting position determination region, a breadth of the region in which the pressure of the contact threshold value or greater is detected within the sitting position determination region, and the total pressure detected within the sitting position determination region.

5 . The bed-leaving sensor according to claim 1 , wherein the pressure sensing center is a center of gravity of the region in which the pressure of the contact threshold value or greater is detected with the pressure sensor.

6 . The bed-leaving sensor according to claim 1 , wherein the pressure sensing center is an area center of the region in which the pressure of the contact threshold value or greater is detected with the pressure sensor.

7 . The bed-leaving sensor according to claim 1 , wherein the foot movement detection member detects the foot movement based on a breadth of a region in which pressure of a given contact threshold value or greater has been detected within a preset foot pressure detection region on the pressure sensor, a total pressure detected within the foot pressure detection region across a given time, and a maximum pressure value detected within the foot pressure detection region.

8 . The bed-leaving sensor according to claim 1 , further comprising a notification member for notifying that the bed-leaving behavior of the user has been detected.

9 . A bed-leaving detection method for detecting bed-leaving by a user on a bed, comprising:
a sitting position detection step for detecting a sitting position of the user based on a detection value of a pressure sensor arranged on the bed; a foot movement detection step for detecting foot movement of the user based on the detection value of the pressure sensor; and a bed-leaving behavior detection step for detecting bed-leaving behavior of the user with the sitting position or the foot movement being detected within a preset bed-leaving expectation region as a condition.

10 . The bed-leaving detection method according to claim 9 , wherein a foot side region on the bed is set as the bed-leaving expectation region.

11 . The bed-leaving detection method according to claim 9 , wherein with the sitting position detection step, a determination area is set in a periphery of a pressure sensing center of a region in which pressure of a given contact threshold value or greater is detected within a preset sitting position determination region on the pressure sensor, and the sitting position is detected based on a ratio of a total pressure detected within the determination area occupying a total pressure detected within the sitting position determination region, a breadth of the region in which the pressure of the contact threshold value or greater is detected within the sitting position determination region, and the total pressure detected within the sitting position determination region.

12 . The bed-leaving detection method according to claim 9 , wherein the foot movement detection step detects the foot movement based on a breadth of a region in which pressure of a given contact threshold value or greater is detected within a preset foot pressure detection region on the pressure sensor, a total pressure detected within the foot pressure detection region across a given time, and a maximum pressure value detected within the foot pressure detection region.

Assignees

• Sumitomo Riko Co Ltd

Inventors

• Shimizu Atsuki

Classifications

• G08B29/185

  Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system · CPC title

• G08B21/22

  responsive to presence or absence of persons · CPC title

• A61B2562/0247

  Pressure sensors · CPC title

• A61B5/1036

  Measuring load distribution, e.g. podologic studies · CPC title

• A61B5/1115 Primary

  Monitoring leaving of a patient support, e.g. a bed or a wheelchair · CPC title