EP2735293A1 - Dispositif de matelas gonflable et procédé de support de patient avec un tel dispositif - Google Patents

Dispositif de matelas gonflable et procédé de support de patient avec un tel dispositif Download PDF

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Publication number
EP2735293A1
EP2735293A1 EP20130194552 EP13194552A EP2735293A1 EP 2735293 A1 EP2735293 A1 EP 2735293A1 EP 20130194552 EP20130194552 EP 20130194552 EP 13194552 A EP13194552 A EP 13194552A EP 2735293 A1 EP2735293 A1 EP 2735293A1
Authority
EP
European Patent Office
Prior art keywords
pressure
cells
series
valve
compressor
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.)
Granted
Application number
EP20130194552
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German (de)
English (en)
Other versions
EP2735293B1 (fr
Inventor
Nicola Gelmetti
Fabio Martinelli
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.)
MKS Innovatech SRL
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MKS Innovatech SRL
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Publication of EP2735293A1 publication Critical patent/EP2735293A1/fr
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Publication of EP2735293B1 publication Critical patent/EP2735293B1/fr
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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
    • A61G7/05—Parts, details or accessories of beds
    • A61G7/057—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor
    • A61G7/05769—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor with inflatable chambers
    • A61G7/05776—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor with inflatable chambers with at least two groups of alternately inflated chambers
    • 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
    • A61G2203/00—General characteristics of devices
    • A61G2203/30—General characteristics of devices characterised by sensor means
    • A61G2203/34—General characteristics of devices characterised by sensor means for pressure

Definitions

  • the present invention refers, in general, to a system with an inflatable mattress and a method of operation for said system.
  • the present invention refers to a system comprising an inflatable bedsores mattress and a method of operation for said system.
  • anti-decubitus mattresses which usually have at least two series of cells which are inflated and deflated alternately according to predefined time cycles in order to vary over time the position of the patient who lies on the mattress by varying the zones of support of the patient on the mattress.
  • the bedsores mattresses are inflated by one or more compressors whose operation has to be controlled by a suitable management and control system which adjusts the inflation and deflation of each of the two series of cells in the mattress.
  • a system like this does not allow to obtain an efficient control of the pressure applied on the mattress.
  • the mattress has to be continuously fed because the air, even if in a variable quantity, flows from the mattress to the sensor mat and from the sensor mat to the outside.
  • An aim of the invention is to carry out a mattress inflating system overcoming the problems of the prior art.
  • Another aim of the invention is that the evaluation of the optimal pressure at which the cells of the mattress are inflated is more precise and reliable without being affected by the problems described above.
  • the method comprises the steps of:
  • the so-described method allows to determine the supporting pressure on the base of the indicative time, with a measurement of the time spent by the one or more control chambers to pass from a first pressure to a second pressure, on obtaining a precise estimation of the weight and posture of the patient, both during the inflation and during the deflation of the inflatable mattress.
  • the first pressure and/or the second pressure are predetermined so as to compare the indicative time measured to pass from the first pressure to the second pressure with experimental data having the same first pressure and/or the same second pressure.
  • the discharge connection of the valve may comprise a calibrated hole.
  • the presence of the calibrated hole allows air to go out of the mattress through one or more holes whose dimensions and features have been determined previously.
  • the measurements effected with said calibrated hole allow a comparison with experimental data obtained with other exhausts or discharges having calibrated holes.
  • the controller may control the start of the inflation and/or deflation of the control chamber from a reset pressure that is higher than the first pressure in case of a deflation, or lower than the first pressure in case of an inflation, the indicative time being measured in any case as time spent by the control chamber to pass from the first pressure to the second pressure.
  • the start from a reset pressure allows the controller to measure the indicative time from the moment that the control chamber passes from the first pressure to the second pressure, there being the additional advantage of obtaining a more accurate, precise measurement because the variable transitional phenomena occurring at the beginning of the inflation or deflation are excluded.
  • This advantage is important in case of a deflation because the time required to pass from the first pressure to the second pressure is usually shorter than the passage time required in case of an inflation.
  • the first series of cells and/or the second series of cells may comprise a dynamic portion and a static portion, which are separated from each other.
  • the static portions may communicate with each other through connecting means.
  • the static portions may be connected to the compressor and to the pressure sensor.
  • the control chamber may comprise said static portions.
  • the static portion may be connected at a first point with the pressure sensor and at a second point with the compressor and valve, said first point being disposed at an end of the inflatable mattress and said second point being disposed at the opposite end so as to space them and to deflate the static portion by means of the discharge of the valve.
  • the so-described construction allows to obtain as much distance as possible between the exhaust or discharge of the valve, where air goes out of the static portion and/or the control chamber, and the pressure sensor. In this way, a large amount of air is interposed between the pressure sensor and the exhaust and this air has to flow through the elements forming the control chamber in order to go out of the discharge of the valve.
  • the pressure sensor measures a pressure under conditions of static fluids. The pressure measurement does not undergo the measurement errors of the prior art, due to a leakage of air in the vicinity of the pressure sensor.
  • the controller may start said measurement of indicative time on starting the system and when the controller detects a pressure variation in the at least one control chamber, said pressure variation being evaluated as a pressure jump occurred in a predetermined time, said pressure variation is intended by the controller as a variation of weight and/or posture of the patient supported by the inflatable mattress.
  • said pressure jump exceeds a predetermined threshold level.
  • the pressure jump has to overcome a predetermined threshold level, it is possible to filter the small movements of the patient or the small changes in weight and/or posture that cause pressure variations in the control chamber. In this way, it is possible to have the start of the measurement of indicative time only in those cases in which the variation of weight and/or posture of the patient are such as to impose a variation in the support pressure.
  • the prior art measures the patient in a different way according to the series of cells that are charged or discharged while in the method and system according to the invention, the determination of the supporting pressure of the patient is always based on a measurement of the variation of weight and/or posture over the entire length of the mattress.
  • the aims are also achieved according to the invention by a system, adapted to support a patient.
  • the system comprises:
  • the first series of cells and/or the second series of cells comprises a dynamic portion and a static portion which are separated from each other, said static portions being communicating with each other through means of connection, said static portions being connected to the compressor and to the pressure sensor and acting as a control chamber.
  • the static portion may be connected at a first point with the pressure sensor and at a second point with the compressor and valve, said first point being placed at an end of the inflatable mattress and said second point being placed at the opposite end so as to space them and to deflate the static portion through the discharge of the valve.
  • the discharge connection of the valve may comprise a calibrated hole.
  • reference number 10 denotes an inflatable mattress comprising a top sheet 11 and a conduit for feeding air from the outside (not visible in the figure).
  • the top sheet 11 is joined to a bottom sheet 15, for instance by means of a zipper.
  • a first series of cells 21 and a second series of cells 25 are arranged between the upper sheet 11 and the bottom sheet 25 so as to obtain an alternate configuration of each cell of the first series of cells 21 with the corresponding cells of the second series of cells 25.
  • the left manifold 16 comprises a first left track 44, a second left track 46 and a third left track 48.
  • the third left track 48 surrounds the first left track 44 and the second left track 46.
  • reference number 110 denotes a system comprising an inflatable mattress 10, as described above, and a compressor 60.
  • the compressor 60 communicates through a first feed conduit 62 with a valve 64 and communicates through a second feed conduit 66 with the third right track 38 of the right manifold 14 of the inflatable mattress.
  • the valve 64 comprises four connections with the outside, namely, one connection being connected with the first feed conduit 62, two delivery conduits comprising a respective pressure-gauge and a last discharge connection 70.
  • valve 64 comprises an inner mechanism that puts two or more of the four connections to the outside in communication with each other in order to allow a continuous adjustment of the valve 64 and passage of the air inside the valve 64.
  • the second series of cells 25 comprises a dynamic portion 92, fed by the second connection 86 directly, and a static portion 94 communicating through a static connection 88 with the third left track 48 of the left manifold 16.
  • a sensor conduit 96 is connected and communicates with a pressure sensor 98.
  • a controller 100 controls and monitors the operation of the compressor 60, the valve 64 and the pressure sensor 98.
  • the operation of the system 110 is actuated by the controller 100 that orders the compressor to supply compressed air to the first feed conduit 62 and to the second feed conduit 66 so as to supply compressed air to the valve 64 and to the third right track 38 of the right manifold 14 and to inflate, consequently, the static portion 30 of the first series of cells 21 and the static portion 94 of the second series of cells 25 which reach, therefore, the same pressure since they are in communication with each other.
  • controller 100 controls the valve 64 so that the valve 64 puts the first feed conduit 62 in communication with the first delivery conduit 72 and/or with the second delivery conduit 74 on inflating the dynamic portion 30 of the first series of cells 21 and/or the dynamic portion 92 of the second series of cells 25, respectively.
  • the controller 100 may deflate, through the control of the inner mechanism of the valve 64, the dynamic portion 28 of the first series of cells 21 on putting the first delivery conduit 72 in communication with the discharge 70 of the valve 64.
  • the dynamic portion 92 of the second series of cells 25 may be deflated on putting the second delivery conduit 74 in communication with the discharge 70 of the valve 64.
  • the deflation of the respective dynamic portions may take place whether the compressor 60 is operating or the compressor 60 is not operating and therefore, it does not supply compressed air to the first feed conduit 62.
  • the controller 100 controls the pressure of the air contained in the relative dynamic portions of the first series of cells 21 and second series of cells 25 by means of the two pressure-gauges contained in the valve 64 for the first delivery conduit 72 and the second delivery conduit 74.
  • the system 110 performs an operating cycle in which the body of the patient is supported alternately by the first series of cells 21 and second series of cells 25 of the inflatable mattress by changing the air pressure in each point of the inflatable mattress over time.
  • the system 110 brings alternately the first series of cells 21 and the second series of cells 25 to the so-called support pressure that is the optimal pressure for the support of the patient depending mainly on the weight and posture of the patient resting on the inflatable mattress.
  • the support pressure for supporting the patient may vary over time depending, for instance, on the presence or absence of the patient on the inflatable mattress, the presence of a patient of different weight, each change of posture or position of the patient and other factors or events affecting the patient or the system 110.
  • evaluation cycle a method is described to determine the support pressure, (called evaluation cycle hereinafter) which allows an evaluation of the support pressure when the system 110 is started, as well as an evaluation of its variation over time, due to the factors listed above.
  • the controller 100 actuates the compressor 60 and arranges the valve 64 in such a way that the first feed conduit 62 is in communication with the first delivery conduit 72 and with the second delivery conduit 74 in order to inflate the dynamic downstream portions.
  • the compressed air supplied by the compressor 60 inflates also all the static portions of the inflatable mattress through the second feed conduit 66.
  • the controller 100 allows the dynamic portions of the inflatable mattress to be inflated so as to reach an initial pressure, for instance a support pressure evaluated or preset that corresponds, for instance, to 25 mm of mercury.
  • an initial pressure for instance a support pressure evaluated or preset that corresponds, for instance, to 25 mm of mercury.
  • the controller 100 orders the valve 64 to separate the first delivery conduit 72 and the second delivery conduit 74 from the first feed conduit 62 so as not to further inflate the dynamic portions of the inflatable mattress.
  • the controller 100 keeps the compressor 60 alight on allowing a further inflation of the static portions of the inflatable mattress so as to reach a reset pressure that will be, therefore, higher than the initial pressure at which the dynamic portions of the inflatable mattress are inflated.
  • the reset pressure may be 32 mm of mercury.
  • the controller 100 may, conveniently, orders the turning off of the compressor 60 so as to obtain a remarkable energy saving in comparison with the known systems in which the compressor remains always alight.
  • the compressor 60 may be turned on again and utilized in the various operation phases of the system 110, for instance after a predetermined time has elapsed, for instance a time of 5 or 10 minutes, after which it is necessary to alternate the pressures of the air contained in the respective dynamic portions of the first series of cells 21 and second series of cells 25.
  • the controller 100 orders the valve 64 to put the first feed conduit 62 in communication with its discharge 70 so as to deflate the static portions or the inflatable mattress through the calibrated hole of the discharge 70.
  • the controller 100 When the pressure sensor 98 detects a pressure corresponding to a start pressure, for instance of 30 mm of mercury, the controller 100 starts measuring an indicative time, spent to reach a stop pressure, for instance of 20 mm of mercury, detected by the pressure sensor 98, the stop pressure being lower than the start pressure. When the stop pressure has been reached, the controller 100 orders the valve 64 to stop the communication between the first feed conduit 62 and the discharge 70 so as not to further deflate the static portions of the inflatable mattress.
  • a start pressure for instance of 30 mm of mercury
  • the indicative time, spent to reach the stop pressure beginning from the start pressure, is evaluated by the controller 100 to obtain an estimation of the support pressure that will be applied in a subsequent time, the evaluated pressure being indicative of the weight and posture of the patient supported by the inflatable mattress.
  • the controller 100 evaluates the support pressure by taking advantage of a database of experimental data that correlate the measured indicative time with corresponding times obtained in the experiments, to which a determined support pressure has been correlated.
  • the database may supply time intervals for which a determined optimal support pressure is provided in order to simplify the collection of the experimental data and the processing thereof in view of a correct operation of the system 110.
  • a correlation table may be drafted to bind the measured time intervals with the respective suggested support pressures.
  • the controller 100 monitors the pressure sensor 98 and the pressure-gauge of the valve 64 continuously to detect any abrupt pressure changes due to a change of patient or to a change of posture in order to proceed with a new estimation of the optimal support pressure for the new condition by utilizing the so-described evaluation cycle.
  • the reliability of the estimation is ensured by the distance between the discharge 70 of the valve 64 and the pressure sensor 98, which distance allows the pressure sensor 98 to continuously detect a pressure that is not affected by the air flow going out of the discharge 70 of the valve 64 while the pressure sensors in the known systems are placed near the discharge.
  • the pressure sensor 98 is connected to the third right track 38 at the end opposite the second feed conduit 66 so that any pressure variations due to the air flow going out of the discharge 70 are absorbed by all the static portions connected to the third right track 38 and to the third left track 48.
  • the safety of the patient is ensured by the continuous support given by the dynamic portions of the inflatable mattress, whose pressure is not modified during the evaluation cycle that affects only the static portions of the inflatable mattress.
  • the determination of another indicative time may be obtained by measuring the interval of time spent to inflate the static portions of the inflatable mattress from a start pressure to a final pressure higher than the start pressure.
  • the evaluation cycle according to the invention always utilizes the same pressure interval for the evaluation of the time spent and evaluates a support pressure on the base of said time so that the evaluation cycle according to the invention offers the advantages of greatly simplifying the collection of experimental data and avoiding the possibility of causing a too fast and uncontrolled deflation, which could make the patient touch the ground.
  • each cell of the inflatable mattress according to the invention into a dynamic portion and a static portion allows to subdivide two functions of the system in the space.
  • a first function that is the support of the patient on ensuring an alternation of pressures between the first series of cells and the second series of cells so as to avoid the formation of bedsores and other problems is effected by the whole of the dynamic portions of the cells.
  • the system according to the invention improves the patient safety because the patient is supported by two layers that may be considered independent to each other so that in case a layer should be defective, the other layer, formed by the whole of the static portions, would continue ensuring the patient support on avoiding that the patient touches the ground unintentionally.

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  • 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)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Percussion Or Vibration Massage (AREA)
EP13194552.9A 2012-11-27 2013-11-27 Dispositif de matelas gonflable et procédé de support de patient avec un tel dispositif Active EP2735293B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000233A ITVR20120233A1 (it) 2012-11-27 2012-11-27 Sistema con materasso gonfiabile e metodo di funzionamento di detto sistema

Publications (2)

Publication Number Publication Date
EP2735293A1 true EP2735293A1 (fr) 2014-05-28
EP2735293B1 EP2735293B1 (fr) 2015-09-30

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Application Number Title Priority Date Filing Date
EP13194552.9A Active EP2735293B1 (fr) 2012-11-27 2013-11-27 Dispositif de matelas gonflable et procédé de support de patient avec un tel dispositif

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EP (1) EP2735293B1 (fr)
ES (1) ES2550516T3 (fr)
IT (1) ITVR20120233A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559455A (en) * 2017-02-07 2018-08-08 Direct Healthcare Services Ltd Mattress Systems
GB2568875A (en) * 2017-11-24 2019-06-05 Direct Healthcare Services Ltd Mattress and pump arrangement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6058537A (en) * 1998-07-13 2000-05-09 Larson; Lynn D. Pressure control apparatus for air mattresses
US6789284B2 (en) * 2000-12-09 2004-09-14 Huntleigh Technology, Plc Inflatable support
US20090007341A1 (en) * 2005-05-12 2009-01-08 Simon Michael Roff Inflatable support
EP2465480A1 (fr) * 2010-12-14 2012-06-20 MKS Innovatech S.r.l. Matelas gonflable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6058537A (en) * 1998-07-13 2000-05-09 Larson; Lynn D. Pressure control apparatus for air mattresses
US6789284B2 (en) * 2000-12-09 2004-09-14 Huntleigh Technology, Plc Inflatable support
US20090007341A1 (en) * 2005-05-12 2009-01-08 Simon Michael Roff Inflatable support
EP2465480A1 (fr) * 2010-12-14 2012-06-20 MKS Innovatech S.r.l. Matelas gonflable

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2559455A (en) * 2017-02-07 2018-08-08 Direct Healthcare Services Ltd Mattress Systems
GB2559455B (en) * 2017-02-07 2020-02-19 Direct Healthcare Group Ltd Mattress System
GB2578537A (en) * 2017-02-07 2020-05-13 Direct Healthcare Group Ltd Seat pad system
GB2578537B (en) * 2017-02-07 2021-03-03 Direct Healthcare Group Ltd Seat pad system
EP3579807B1 (fr) * 2017-02-07 2024-08-21 Direct Healthcare Group Limited Système de matelas
GB2568875A (en) * 2017-11-24 2019-06-05 Direct Healthcare Services Ltd Mattress and pump arrangement
GB2568875B (en) * 2017-11-24 2021-03-24 Direct Healthcare Group Ltd Mattress and pump arrangement

Also Published As

Publication number Publication date
ES2550516T3 (es) 2015-11-10
ITVR20120233A1 (it) 2014-05-28
EP2735293B1 (fr) 2015-09-30

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