EP2398438B1 - Système et procédé de réglage de la hauteur d'un lit - Google Patents

Système et procédé de réglage de la hauteur d'un lit Download PDF

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Publication number
EP2398438B1
EP2398438B1 EP10705435.5A EP10705435A EP2398438B1 EP 2398438 B1 EP2398438 B1 EP 2398438B1 EP 10705435 A EP10705435 A EP 10705435A EP 2398438 B1 EP2398438 B1 EP 2398438B1
Authority
EP
European Patent Office
Prior art keywords
bed
user
status
adjustable height
control system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10705435.5A
Other languages
German (de)
English (en)
Other versions
EP2398438A1 (fr
Inventor
Kurt Stadlthanner
Andreas Brauers
Kai Eck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Intellectual Property and Standards GmbH
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Intellectual Property and Standards GmbH, Koninklijke Philips Electronics NV filed Critical Philips Intellectual Property and Standards GmbH
Priority to EP10705435.5A priority Critical patent/EP2398438B1/fr
Publication of EP2398438A1 publication Critical patent/EP2398438A1/fr
Application granted granted Critical
Publication of EP2398438B1 publication Critical patent/EP2398438B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/012—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame raising or lowering of the whole mattress frame
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/018—Control or drive mechanisms

Definitions

  • the invention relates to a system and method for adjusting the height of a bed, and in particular to a system and method that reduces the risk of injury to a person using the bed.
  • a much more accepted way to reduce falls at night is to provide a bed that can be lowered when the patient is in the bed so that they sleep quite close to the floor. In this way, the distance that the patient can fall is reduced and the risk of severe injuries is thereby reduced.
  • adjustable height beds can usually be lifted electronically using an associated control unit.
  • These control units can be hard to handle for elderly patients who suffer from reduced sensitivity or flexibility of their hands and/or from limited vision.
  • patients with dementia can often find it difficult to handle and operate electrical devices.
  • a control system as claimed in claim 1, for an adjustable height bed, the adjustable height bed having a raised position and a lowered position
  • the control system comprising an input for receiving signals from a sensor located in the adjustable height bed and a processor for processing the received signals to determine the status of a user relative to the bed and for generating control signals for adjusting the bed to the raised position or to the lowered position on the basis of the determined status wherein in the event that the processor determines that the user has got into the bed and is lying in the bed, the processor generates control signals for adjusting the bed to the lowered position.
  • an adjustable height bed comprising a bed or mattress portion; a sensor associated with the bed or mattress portion; an adjustable height mechanism for adjusting the height of the bed or mattress portion to the raised position or to the lowered position; and a control system as described above coupled to the sensor and the adjustable height mechanism, the control system being configured to generate control signals for the adjustable height mechanism.
  • a method of operating an adjustable height bed comprising receiving signals from a sensor located in the adjustable height bed; processing the received signals to determine the status of a user relative to the bed; and adjusting the bed to the raised position or to the lowered position on the basis of the determined status wherein, in the event that it is determined that the user has got into the bed and is lying in the bed, the bed is adjusted to the lowered position.
  • Fig. 1 shows an exemplary adjustable height bed 2 and control system 4 according to the invention.
  • the adjustable height bed 2 has a bed or mattress portion 6 that a user can sit or lie on, a base 8 and some adjustable height mechanism 10 for adjusting the height of the bed or mattress portion 6.
  • the adjustable height mechanism 10 adjusts the height of the bed or mattress portion 6 between at least a raised position, at which it is easier for the user to get off of the bed 2, and a lowered position, at which the risk of the user injuring themselves if they roll out of the bed 2 is reduced.
  • the difference in height between the raised and lowered positions can be of the order of 0.5m - 1m.
  • the bed 2 can be configured for use by a specific user.
  • the specific height of the bed or mattress portion 6 above the floor in each of the raised and lowered positions can be adjusted for different users.
  • the raised position could be set higher for a tall person than for a short person.
  • This configuration for a specific user can be achieved through suitable control of the adjustable height mechanism.
  • the control system 4 is coupled to, and controls the operation of, the adjustable height mechanism 10.
  • a sensor 12 is provided in or on the bed or mattress portion 6 for sensing force or pressure exerted on the bed or mattress portion 6 by the user. Signals from the sensor 12 are provided to the control system 4. Preferably, the sensor 12 is placed in or on the bed or mattress portion 6 such that it will be located under the thorax of the user when they are lying appropriately on the bed or mattress portion 6.
  • the sensor 12 can be a force sensor for measuring the forces exerted on the bed or mattress portion 6 by the user, a pressure sensor for measuring the pressure exerted on the bed or mattress portion 6 by the user, or a strain gauge for measuring the strain on the bed or mattress portion 6 caused by the user. In this latter embodiment, the measurements from the strain gauge are used to determine the pressure being exerted on the bed or mattress portion 6 by the user.
  • the sensor 12 is selected from a piezoelectric switch, a piezoelectric foil, an electret foil or a strain gauge. Those skilled in the art will appreciate that alternative types of sensors can be used to perform the method in accordance with the invention.
  • control system 4 processes the signals from the sensor 12 to determine the status of the user relative to the bed (i.e. the user is lying down asleep, sat of the edge of the bed 2, getting into or out of the bed 2 or is out of the bed 2) and adjusts the height of the bed 2 to reduce the risk of the user falling and/or the risk of the user injuring themselves during a fall.
  • the height of the bed 2 is lowered so that the risk of the user injuring themselves if they roll out of the bed 2 is reduced. Furthermore, if it is determined that the user is sat on the edge of the bed (which can be seen as a reliable predictor of the user getting out of the bed 2), the user is getting out of the bed 2, the height of the bed 2 is raised so that it is easier for the user to stand up, thereby reducing the risk of the user falling.
  • the control system 4 preferably predicts or detects that the user is going to get out of the bed 2 early enough so that the bed 2 can be raised to a safe height before the user actually gets out of the bed 2. In addition, the control system 4 preferably determines that the user is lying down safely before lowering the bed 2, in order to reduce the risk that the user will fall out of the bed 2 while it is lowered.
  • Fig. 2 shows the control system 4 in more detail.
  • the control system 4 has an input 14 for receiving signals from the sensor 12, a processor 16 that is coupled to the input 14 and which processes the received signals to determine the status of a user relative to the bed 2.
  • the processor 16 is coupled to an output 18 through which signals for controlling the adjustable height mechanism 10 are transmitted.
  • the control system 4 further comprises a memory 20 for storing instructions for the algorithm used to process the signals from the sensor 12 and for generating the control signals for the adjustable height mechanism 10.
  • control system 4 can also include a user-operable height control 22.
  • This control 22 allows the user or a care provider to manually control the adjustment of the height of the bed or mattress portion 6 (or to override the bed height set by the algorithm according to the invention).
  • control system 4 is shown as being co-located with the adjustable height bed 2, it will be appreciated that the control system 4 can be located remotely from the bed 2, which means that the signals from the sensor 12 will be transmitted to the control system 4 for processing, and the signals for controlling the height of the bed 2 will be transmitted back to the adjustable height mechanism 10.
  • Fig. 3 shows an exemplary set of signals received from a pressure sensor 12.
  • the exemplary set of signals represents various different states of the user and the bed 2.
  • Fig. 4 is a graph showing the variance of the signals shown in Fig. 3 .
  • segment I the bed 2 is unoccupied, i.e. the user is out of the bed 2, and this is represented by the signal amplitude being small ( ⁇ -1500), as the sensor 12 is comparatively relaxed and measures only the pressure exerted from the weight of the mattress.
  • segment II the user sits on the edge of the bed 2 and gets ready to lie down.
  • the centre of gravity of the user is away from the sensor 12 (which is located in the middle of the bed or mattress portion 6 around the point at which the thorax of the user will be located when they are lying down), which means that almost no additional pressure is detected.
  • Segment III shows the signal recorded when the user is lying down. Lying down leads to signals with a high amplitude and a comparatively large variance (as shown in Fig. 4 ).
  • segment IV the user is lying calmly on the bed 2.
  • the thorax of the user is exerting considerable additional pressure onto the sensor 12, which leads to high amplitude signals being recorded.
  • the variance of these signals is small, however, as the user is not moving.
  • segment V the user sits up.
  • a large, high variance signal appears first which decays rapidly once the user has lifted their upper body from the region of the bed 2 in which the sensor 12 is located.
  • An amplitude smaller than a threshold value a in indicates that the process of sitting up is almost finished.
  • segment VI the user is sitting on the edge of the bed 2.
  • segment VII the user has got off of the bed 2, and the signal indicates that the bed 2 is empty.
  • Fig. 5 shows the steps in the algorithm executed by the processor 16.
  • step 103 the height status of the bed 2 is determined (i.e. whether the bed 2 is in the raised or lowered positions). This determination can be made by examining the status of the adjustable height mechanism 10, or by reading a status of the bed 2 from the memory 20.
  • step 105 the next sample or signal a from the sensor 12 is read.
  • the sample a is compared to the amplitude threshold, a in . If a is less than the threshold value a in the process moves to step 109.
  • step 109 if the status of the bed 2 is "high", the bed 2 is left in the raised position and the method returns to step 105 in which the next sample a is read. However, if, at step 109, the status of the bed 2 is "low” (i.e. it is in the lowered position), the process moves to step 111 in which the bed 2 is raised, and the status of the bed is set to "high".
  • the method then returns to step 105 in which the next sample or signal a is read from the sensor 12.
  • step 107 if the amplitude of the signal a is greater than the threshold value a in , the method passes to step 113 in which the variance, var, of the signal is compared to the variance threshold, var in .
  • the method returns to step 105 and the next sample a is read.
  • the user is on the bed, but either in the process of lying down, sitting up or rolling over (as shown in segments III and VI of Fig. 3 ). Therefore, adjustments of the bed height should be avoided, as this could increase the risk of the user suffering a fall.
  • step 115 the method passes to step 115 in which the height status of the bed 2 is examined.
  • the bed status is "high”
  • the bed is lowered and the status of the bed is set to "low”.
  • the method then returns to step 105 and the next sample a is read. If, at step 115, the bed status is "low”, then the method returns to step 105 and the next sample a is read.
  • control system 4 can be integrated into the bed 2 or can be separate from the bed 2.
  • control system 4 can be integrated into existing electronics in a bed 2 (for example the electronics for controlling the adjustment of the height of the bed 2).
  • some height adjustable beds 2 can also be electronically adjusted into a chair-like configuration.
  • the algorithm according to the invention it is possible for the algorithm according to the invention to be adapted so that when the bed 2 is moved into the raised position the bed 2 is also adapted to change into the chair-like configuration, and vice versa.
  • a control system for a height adjustable bed that automatically adjusts the height of the bed according to the status of the user relative to the bed.
  • the bed can be adjusted into a raised position if it is determined that the user is getting into or out of the bed, or adjusted into a lowered position if it is determined that the user is lying on the bed. In this way, the risk of falls, and the risk of injury sustained during a fall, can be reduced.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. Any reference signs in the claims should not be construed as limiting the scope.

Landscapes

  • Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Invalid Beds And Related Equipment (AREA)

Claims (13)

  1. Dispositif de contrôle (4) pour un lit réglable en hauteur (2), ce lit réglable en hauteur ayant une position relevée et une position abaissée, le dispositif de contrôle comprenant:
    une entrée (14) pour recevoir des signaux provenant d'un capteur (12) situé dans le lit réglable en hauteur et
    un calculateur (16) pour analyser les signaux reçus pour déterminer l'état d'un utilisateur par rapport au lit et pour générer des signaux decontrôle à fin d'ajuster le lit dans sa position relevée ou abaissée en fonction de l'état déterminé,
    caractérisé en ce que, lorsque le calculateur détermine l'état de l'utilisateur comme étant que l'utilisateur est entré dans le lit et est allongé dans le lit, le calculateur est configuré pour générer des signaux de contrôle pour ajuster le lit dans la position abaissée.
  2. Dispositif de contrôle (4) selon la revendication 1, caractérisé en ce que, lorsque le calculateur détermine l'état de l'utilisateur comme étant que l'utilisateur est sorti ou est en train de sortir du lit (2), ou est assis sur le bord du lit, le calculateur (16) est configuré pour générer
    des signaux de contrôle pour ajuster le lit dans la position relevée, ou pour maintenir le lit dans la position relevée si le lit est déjà dans la position relevée.
  3. Dispositif de contrôle (4) selon la revendication 2, dans lequel le calculateur (16) est configuré pour déterminer que l'utilisateur est sorti ou est en train de sortir du lit (2), ou est assis sur le bord du lit, lorsque l'amplitude des signaux reçus est en dessous d'un seuil d'amplitude.
  4. Dispositif de contrôle (4) selon la revendication 1,2 ou 3, caractérisé en ce que, lorsque le calculateur (16) détermine l'état de l'utilisateur comme étant que l'utilisateur est allongé sur le lit (2), le calculateur est configuré pour générer des signaux de contrôle pour maintenir le lit dans la position abaissée si le lit est déjà dans la position abaissée.
  5. Dispositif de contrôle (4) selon une des revendications 1 à 4, caractérisé en ce que le calculateur (16) est configuré pour déterminer que l'utilisateur est allongé dans le lit lorsque l'amplitude des signaux reçus est au dessus d'un ou du seuil d'amplitude et la variance des signaux reçus est en dessous d'un seuil de variance.
  6. Dispositif de contrôle (4) selon une des revendications précédentes, comprenant en plus une interface utilisateur interactive (22) qui a été configurée pour faire générer par le calculateur (16) des signaux de contrôle pour ajuster le lit dans la position relevée ou la position abaissée en réponse d'une entrée utilisateur.
  7. Lit réglable en hauteur (2), comprenant:
    - une partie lit ou matelas (6);
    - un capteur (12) associé à la partie lit ou matelas;
    - un mécanisme d'ajustement en hauteur (10) pour ajuster la hauteur de la partie lit ou matelas jusqu'à la position relevée ou la position abaissée;
    et un dispositif de contrôle (4) selon une des revendications précédentes couple au capteur et le mécanisme d'ajustement en hauteur, le dispositif de contrôle étant configuré pour générer des signaux de contrôle pour le mécanisme d'ajustement en hauteur.
  8. Lit réglable en hauteur (2) selon la revendication 7 dans lequel le capteur (12) est sélectionné parmi un groupe comprenant un transducteur piézoélectrique, une feuille piézoélectrique, une feuille d'électret et une jauge de déformation.
  9. Méthode pour actionner un lit réglable en hauteur (2), le lit réglable en hauteur ayant une position relevée et une position abaissée, la méthode comprenant:
    la réception de signaux provenant d'un capteur (12) situé dans le lit ajustable en hauteur;
    - le traitement des signaux reçus pour déterminer la position relative d'un utilisateur par rapport au lit réglable en hauteur;
    - l'ajustement du lit vers la position relevée ou la position abaissée en fonction de l'état de l'utilisateur déterminé ;
    - dans laquelle, lorsqu'il est déterminé que l'état de l'utilisateur est que l'utilisateur est entré dans le lit et est allongé dans le lit, l'étape d'ajustement comprend:
    l'ajustement du lit vers la position abaissée.
  10. Méthode selon la revendication 9, dans laquelle, lorsqu'il est déterminé que l'état de l'utilisateur est que l'utilisateur est sorti ou est en train de sortir, ou est assis sur le bord du lit (2), l'étape d'ajustement comprend:
    l'ajustement du lit vers la position relevée ou maintenir le lit dans la position relevée si le lit est déjà dans la position relevée.
  11. Méthode selon la revendication 10, dans laquelle l'étape de traitement détermine que l'utilisateur est sorti ou est en train de sortir du lit (2), ou est assis sur le bord du lit, lorsque l'amplitude des signaux reçus est en dessous d'un seuil d'amplitude.
  12. Méthode selon les revendications 9, 10 ou 11, dans laquelle, lorsqu'il est déterminé que l'état de l'utilisateur est que l'utilisateur est allongé sur le lit, l'étape d'ajustement comprend:
    maintenir le lit dans la position abaissée si la position du lit est déjà abaissée.
  13. Méthode selon la revendication 12, dans laquelle l'étape de traitement détermine que l'utilisateur est allongé dans le lit lorsque l'amplitude des signaux reçus est au dessus d'un ou du seuil d'amplitude et la variance des signaux reçus est en dessous d'un seuil de variance.
EP10705435.5A 2009-02-20 2010-02-16 Système et procédé de réglage de la hauteur d'un lit Not-in-force EP2398438B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10705435.5A EP2398438B1 (fr) 2009-02-20 2010-02-16 Système et procédé de réglage de la hauteur d'un lit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09153276 2009-02-20
EP10705435.5A EP2398438B1 (fr) 2009-02-20 2010-02-16 Système et procédé de réglage de la hauteur d'un lit
PCT/IB2010/050696 WO2010095098A1 (fr) 2009-02-20 2010-02-16 Système et procédé de réglage de la hauteur d'un lit

Publications (2)

Publication Number Publication Date
EP2398438A1 EP2398438A1 (fr) 2011-12-28
EP2398438B1 true EP2398438B1 (fr) 2013-08-28

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EP10705435.5A Not-in-force EP2398438B1 (fr) 2009-02-20 2010-02-16 Système et procédé de réglage de la hauteur d'un lit

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Country Link
US (1) US20110296607A1 (fr)
EP (1) EP2398438B1 (fr)
JP (1) JP2012518456A (fr)
CN (1) CN102316839A (fr)
WO (1) WO2010095098A1 (fr)

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DE102013105176B4 (de) * 2013-05-21 2015-07-30 Logicdata Electronic & Software Entwicklungs Gmbh Handbedienteil für ein elektrisch verstellbares Möbel und elektrisch verstellbares Sitzmöbel
US20160175177A1 (en) * 2014-12-17 2016-06-23 General Electric Company System and method for adjusting the height of a patient support table based upon sensed patient height
CN104554879A (zh) * 2014-12-24 2015-04-29 内蒙古包钢钢联股份有限公司 一种线材打包机托卷台高度控制方法
CN104503488A (zh) * 2014-12-26 2015-04-08 天津工业大学 一种基于物联网技术的床
JP6769922B2 (ja) * 2017-05-01 2020-10-14 パラマウントベッド株式会社 電動家具
CN109431150B (zh) * 2018-10-31 2020-11-20 福州春生夏长环保科技有限公司 一种智能多用床
JP2021000491A (ja) * 2020-09-18 2021-01-07 パラマウントベッド株式会社 電動ベッド
JP2023042621A (ja) * 2021-09-15 2023-03-28 ミネベアミツミ株式会社 固定部材、ベッド用の支持構造体、及びベッド
CN115363375B (zh) * 2022-08-15 2023-07-25 慕思健康睡眠股份有限公司 床垫厚度控制方法、装置、床垫及存储介质
CN116098415A (zh) * 2023-02-15 2023-05-12 北京声智科技有限公司 床垫调节装置及床垫

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Also Published As

Publication number Publication date
WO2010095098A1 (fr) 2010-08-26
US20110296607A1 (en) 2011-12-08
EP2398438A1 (fr) 2011-12-28
CN102316839A (zh) 2012-01-11
JP2012518456A (ja) 2012-08-16

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