WO2003096957A1 - Mattress with pressure sensing device - Google Patents

Mattress with pressure sensing device

Info

Publication number
WO2003096957A1
WO2003096957A1 PCT/SE2003/000805 SE0300805W WO2003096957A1 WO 2003096957 A1 WO2003096957 A1 WO 2003096957A1 SE 0300805 W SE0300805 W SE 0300805W WO 2003096957 A1 WO2003096957 A1 WO 2003096957A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
mattress
device
pressure
alarm
sensing
Prior art date
Application number
PCT/SE2003/000805
Other languages
French (fr)
Inventor
Einar Johansson
Original Assignee
Einar Johansson
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

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/103Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1113Local tracking of patients, e.g. in a hospital or private home
    • A61B5/1115Monitoring leaving of a patient support, e.g. a bed or a wheelchair
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/68Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A61B5/6892Mats
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00Alarms responsive to a single specified undesired or abnormal operating condition and not elsewhere provided for
    • G08B21/18Status alarms
    • G08B21/22Status alarms responsive to presence or absence of persons
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02Details of sensors specially adapted for in-vivo measurements
    • A61B2562/0247Pressure sensors
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/04Arrangements of multiple sensors of the same type
    • A61B2562/043Arrangements of multiple sensors of the same type in a linear array
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00Detecting, measuring or recording for diagnostic purposes; Identification of persons
    • A61B5/103Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1113Local tracking of patients, e.g. in a hospital or private home

Abstract

This invention relates to a mattress, inside which at least one hollow space (11) is formed, in which a pressure sensing device (16) is mounted, which is arranged to effect an interrupter member (17) coupled to an alarm device (18), more precisely in such a way that the alarm device (18) on one hand is kept inactive as long as the pressure sensing device (16) detects a distinct pressure against the top side of the mattress, and on the other hand activates the alarm device when said pressure ceases.

Description

Mattress with pressure sensing device

Background of the Invention

In various types of care, such as medical service, geriatric care, mental health service, etc., continuous surveillance of patients confined to bed that for different reasons cannot be permitted to leave the bed single-handedly is required. For instance, it may occur that mentally deranged patients, above all in the night-time, get up from their beds and wander about in the care institution in question or even abscond from the same.

Previously known alarm systems for patient surveillance have not been satisfying in respect of efficiency and user-comfort .

Objects and Features of the Invention

The present invention aims at providing a mattress having a built-in alarm function, which may be used in the same way as conventional bed mattresses. Therefore, a primary object of the invention is to provide a mattress that without outer installations is able to reliably detect whether a person lies on the same or not. An additional object is to provide a mattress that not only is simple and inexpensive to manufacture, but also enables good lying comfort. Yet an object of the invention is to provide a mattress that to the largest feasible extent guarantees that an alarm is released as soon as a patient leaves a lying posture, i.e. already when the same rises to a sitting posture, in which the bed has not yet been abandoned. According to the invention, at least the primary object is attained by the features defined in claim 1. Preferred embodiments of the invention are furthermore defined in the dependent claims .

Summary of the Invention

The invention is based on the intention to mount a pressure sensing device and an interrupter member, preferably electrically coupled to an alarm device, inside at least one hollow space formed in the mattress. As long as the sensing device detects a distinct pressure against the top side of the mattress, the interrupter member is effected in such a way that the alarm device is kept inactive, but as soon as the pressure against the top side of the mattress ceases, the alarm device is activated. In a preferred embodiment of the invention, a plurality of hollow spaces with appurtenant pressure sensing devices and interrupter members are arranged within a limited, substantially central area of the mattress.

Brief Description of the Accompanying Drawing

In the drawing: Fig 1 is an exploded view in perspective showing different parts included in the mattress according to the invention, Fig 2 is a schematic planar view from above showing the location of a number of hollow spaces in the mattress, and Fig 3 is an enlarged, partial longitudinal section through the mattress.

Detailed Description of a Preferred Embodiment of the Invention

In the drawing, the mattress is in its entirety designated 1. In the conventional way, the mattress has a rectangular or parallelepipedic basic shape, by being delimited by two parallel long side surfaces 2, 3, two short end surfaces 4, 5, which are likewise mutually parallel, as well as plane top and bottom sides 6, 7. In the shown, preferred embodiment, the mattress is composed of three flat or sheet-shaped cushions, viz . upper and lower cushions 8, 9, as well as an intermediate cushion 10. In the intermediate cushion 10, a plurality of, more precisely three, mutually spaced-apart, through-going openings 11 are recessed, which form hollow spaces inside the mattress when the different' cushions are united with each other. In practice, all cushions may be made of conventional foam rubber or the like and united with each other by agglutination.

The dimensions of the mattress and the different cushions may vary, per se. However, in a preferred embodiment, the upper and lower cushions 8, 9 separately has a thickness of 5 cm, while the intermediate cushion 10 is thinner and may have a thickness of 2 cm. Thus, the total thickness of the mattress may amount to 12 cm. The length L of the mattress suitably amounts to 200 cm, while the width B may be either 80 cm or 90 cm. Also the dimensions of the openings or hollow spaces 11 may vary. In the example, the width Bl amounts to 56 cm, while the axial extension or the length LI amounts to 17 cm. Between the long-side edges of the hollow surfaces and the outer long side surfaces 2, 3 of the mattress, solid material edge por- tions 12 are thus left, the width of which amounts to 12 cm if the width B of the mattress is 80 cm (17 cm when B is 90 cm) . Partition walls 13 between individual hollow spaces 11 may advantageously have a width or thickness T of 7 cm.

The part of the mattress that is adjacent the short end 4. constitutes a head end portion 14 against which the head of the lying person may rest. The axial extension or the length L2 of this head end portion 14 may in practice amount to 75 cm. The corresponding length of a foot end portion 15 then amounts to 60 cm. In each individual hollow space 11, a pressure sensing device is mounted, in its entirety designated 16, which interacts with an interrupter member 17, which in turn is coupled to a schematically shown alarm device 18. The interrupter member 17 may advantageously consist .of a switch, which is con- nected to the alarm device electrically, more precisely via a cable 19. For the sake of simplicity, the alarm device 18 is shown in the immediate vicinity of the bottom side of the mattress. However, the cable 19 may in practice be drawn inside the mattress to a short end, where it ends in a female contact in which a male contact on an additional cable from the alarm device is insertable.

In the shown, preferred embodiment, the pressure sensing device 16 consists of two plates 20, 21, the lower 20 one of which abuts against the bottom of the hollow space. At one of the edges thereof, shown to the left in fig 3, the plates are inter-connected via a hinge 22. This hinge may for instance consist of welded together or casted integrally portions of the plates, which may be made of stiff, although deflectable plastic. The two plates are spring-actuated in order to always aim at springing out from each other towards the position shown in fig 3, in which a gap 23 between the free edges of the plates has a maximum width. This spring action may either be provided by means of specific, spring instruments not shown, or by the plastic sheets being casted or shaped with a certain prestress that guarantees that the gap 23 obtains the desired width in the unloaded state of the sensing device.

In fig 3, the pressure sensing device is shown in an unloaded state, in that no person lies on the mattress. In this state, the switch 17 closes the electric circuit so that the alarm in question, e.g. a sound signal, is released. When a person lies down on the mattress, the plates 20, 21 are pressed together in the area of the gap 23, whereby the switch is effected so that the electric circuit is opened or broken, whereby the alarm ceases. In this connection, it should be pointed out that the proper alarm device may be equipped with a particular off button 24 by means of which the alarm may be switched off in a conscious and controlled way by certificated personnel, more precisely in connection with the patient leav- ing the bed in an authorized way.

It should be particularly pointed out that the pressure sensing device 16 is placed in such a way that the hinges 22 are facing the head end of the mattress. This means that the real pressure sensing takes place in the area of the rear part of the hollow space. Thus, pressure sensing in the hollow space positioned closest to the head end 4 takes place at a relatively large distance from the head end 4, viz. approx. 90 cm from the head end. The consequence of this is that the different pressure sensing devices and appurtenant switches supervise the backside and legs of the lying person, rather than the shoulder portion/head. Therefore, if the lying person sits up in the bed - something which usually takes place in the area closest to the pillow - the alarm is released even before the patient has had time to leave the bed. In this way, nursing staff is at a very early stage given the possibility to prevent that the patient uncontrollably moves far from the bed.

It should furthermore be mentioned that said plates have approximately the same shape and size as the appurtenant hollow space. In this way, the plates cannot move in the hollow spaces .

Feasible Modifications of the Invention The invention is not limited only to the embodiment described above and shown in the drawing. Thus, it is feasible to form the pressure sensing device in another way than in the form of two articulatedly connected plates diverging in a V- shaped way. It is also feasible to dispose another number of hollow spaces and sensing devices, respectively, than three. Of course,, the exemplified dimensions may also be varied in several ways within the scope of the subsequent claims. Furthermore, it is feasible to let the pressure sensing device interact with the alarm device in another way than via a physical cable as is shown in the drawings. Thus, the pressure sensing device may, for instance, effect the alarm device in a radio technical way.

Claims

Claims
1. Mattress, c h a r a c t e r i z e d in that at least one hollow space (1)' is formed inside the same, in which a pressure sensing device (16) is mounted, which is arranged to interact with an alarm device (18), more precisely in such a way that the alarm device on one hand is kept inactive as long as the pressure sensing device (16) detects a distinct pressure against the top side of the mattress, and on the other hand activates the alarm device when said pressure ceases.
2. Mattress according to claim 1, c h a r a c t e r i z e d in that the pressure sensing device (16) comprises two plates (20, 21) that are articulatedly connected to each other along a first edge (22) and extend in a V-shape from said edge to a gap (23) located at opposite, second edges where the interrupter member (17) is arranged, the plates always aiming to spring out from each other toward a position in which the gap has a maximum width.
3. Mattress according to claim 1 or 2, c h a r a c t e ri z e d in that the same is composed of at least three flat or sheet-shaped cushions (8, 9, 10) viz . upper and lower cushions (8, 9) and an intermediate cushion (10) in which at least one through-going opening (11) is recessed in order to form said hollow space.
4. Mattress according to any one of claims 2-3, c h a r a c- t e r i z e d in that the hollow space (11) and said plates (20, 21) have a quadrangular basic shape and are approximately equally large.
5. Mattress according to any one of the preceding claims, c h a r a c t e r i z e d in that a plurality of spaced-apart hollow spaces (11) are formed in the mattress, which separately houses a pressure sensing device (16) .
6. Mattress according to claim 5, c h a r a c t e r i z e d in that the hollow spaces (11) are located in a central area out- side which the mattress is solid, i.e. lacks hollow spaces, viz . in the head end (14) , foot end (15) and side edges (12) of the mattress.
PCT/SE2003/000805 2002-05-22 2003-05-20 Mattress with pressure sensing device WO2003096957A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE0201542 2002-05-22
SE0201542-8 2002-05-22

Publications (1)

Publication Number Publication Date
WO2003096957A1 true true WO2003096957A1 (en) 2003-11-27

Family

ID=20287935

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000805 WO2003096957A1 (en) 2002-05-22 2003-05-20 Mattress with pressure sensing device

Country Status (1)

Country Link
WO (1) WO2003096957A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006046928A1 (en) * 2004-10-26 2006-05-04 Ngee Ann Polytechnic Occupant monitoring and alert system
EP2098206A1 (en) * 2008-03-03 2009-09-09 UMIT Private Universität für Gesundheitswissenschaften Medizinische Informatik und Technik Alarm system
DE202011000045U1 (en) * 2011-01-10 2012-04-13 Recticel Schlafkomfort Gmbh Control system with a mattress
DE102012104222A1 (en) 2012-05-15 2013-11-21 Uwe Hartje Tower for monitoring exit of person e.g. toddler from surface of bed, has two support elements among which second support element is raised relative to surface of the support surface of bed in connected state of article with bed
JP2015506186A (en) * 2011-12-20 2015-03-02 コーニンクレッカ フィリップス エヌ ヴェ Method and apparatus for monitoring the baroreflex user
WO2016184023A1 (en) * 2015-05-19 2016-11-24 京东方科技集团股份有限公司 Nursing bed and control method therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961201A (en) * 1974-09-06 1976-06-01 Rosenthal Morris H Patient monitoring
US4242672A (en) * 1977-11-09 1980-12-30 Gault Robert L Patient monitoring system and switch
US4264904A (en) * 1977-11-28 1981-04-28 Mccoy Roy G Fire and absence detection and alarm system for bed occupants
US4907845A (en) * 1988-09-16 1990-03-13 Salomon Sa Bed patient monitoring system
US20020070866A1 (en) * 1996-09-04 2002-06-13 Paul Newham Modular system for monitoring the presence of a person using a variety of sensing devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961201A (en) * 1974-09-06 1976-06-01 Rosenthal Morris H Patient monitoring
US4242672A (en) * 1977-11-09 1980-12-30 Gault Robert L Patient monitoring system and switch
US4264904A (en) * 1977-11-28 1981-04-28 Mccoy Roy G Fire and absence detection and alarm system for bed occupants
US4907845A (en) * 1988-09-16 1990-03-13 Salomon Sa Bed patient monitoring system
US20020070866A1 (en) * 1996-09-04 2002-06-13 Paul Newham Modular system for monitoring the presence of a person using a variety of sensing devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006046928A1 (en) * 2004-10-26 2006-05-04 Ngee Ann Polytechnic Occupant monitoring and alert system
EP2098206A1 (en) * 2008-03-03 2009-09-09 UMIT Private Universität für Gesundheitswissenschaften Medizinische Informatik und Technik Alarm system
DE202011000045U1 (en) * 2011-01-10 2012-04-13 Recticel Schlafkomfort Gmbh Control system with a mattress
JP2015506186A (en) * 2011-12-20 2015-03-02 コーニンクレッカ フィリップス エヌ ヴェ Method and apparatus for monitoring the baroreflex user
DE102012104222A1 (en) 2012-05-15 2013-11-21 Uwe Hartje Tower for monitoring exit of person e.g. toddler from surface of bed, has two support elements among which second support element is raised relative to surface of the support surface of bed in connected state of article with bed
WO2016184023A1 (en) * 2015-05-19 2016-11-24 京东方科技集团股份有限公司 Nursing bed and control method therefor

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