WO1992007540A1 - Regulateur de pression - Google Patents

Regulateur de pression Download PDF

Info

Publication number
WO1992007540A1
WO1992007540A1 PCT/GB1991/001842 GB9101842W WO9207540A1 WO 1992007540 A1 WO1992007540 A1 WO 1992007540A1 GB 9101842 W GB9101842 W GB 9101842W WO 9207540 A1 WO9207540 A1 WO 9207540A1
Authority
WO
WIPO (PCT)
Prior art keywords
pad
pressure
cells
sensor
air
Prior art date
Application number
PCT/GB1991/001842
Other languages
English (en)
Inventor
Rolf Schild
Original Assignee
Huntleigh Technology Plc
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 Huntleigh Technology Plc filed Critical Huntleigh Technology Plc
Publication of WO1992007540A1 publication Critical patent/WO1992007540A1/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

Definitions

  • the present invention relates to a pressure controller, in particular, a pressure controller for controlling the fluid pressure in an alternating pressure pad.
  • a pressure controller for controlling the fluid pressure in an alternating pressure pad.
  • the fluid in an alternating pressure pad is air.
  • Alternating pressure pads are well known for the prevention and management of decubitus ulcers in bedridden patients.
  • the formation of decubitus ulcers, commonly known as bedsores, results from, amongst other things, the pressure applied to certain portions of the skin of a bedridden patient.
  • decubitus ulcers commonly known as bedsores
  • Alternating pressure pads generally comprise two sets of alternately inflatable cells: the duration of the inflation and deflation cycles may last from under two minutes for a gentle massaging effect to over twenty minutes. Huntleigh Technology pic manufacture and supply such an alternating pressure pad system.
  • a high air pressure in the pads may be needed to support the bony protuberances of a patient and to ensure that the patient is lifted sufficiently away from deflated cells of the pad so that adequate pressure relief is provided.
  • a low air pressure is desirable since it provides a pad which is softer and more comfortable.
  • Optimal pressure support therefore not only varies from patient to patient but also during a given inflation cycle of the pad since the pressure supporting points will change during a cycle. The required optimal support pressure will vary even more as a patient changes from a supine to a sitting position.
  • a manually adjustable pressure controller to set an optimal pad support pressure.
  • This may be a regulator for the compressor supplying air to the alternating pressure pad.
  • an automatic pressure controller comprising a convoluted compressible tube placed under the pad.
  • a pilot valve When the support pressure in the pad is so inadequate that the pressure exerted by a patient causes the tube to be compressed shut, the pilot valve actuates a throttle which diverts a fixed proportion of air, such as one third, from the compressor to the pad thereby to increase the support pressure.
  • the tube is not closed, the fixed proportion of air is vented to the air via a relief valve.
  • W089/08438(PCT/GB89/00232) in the name Of Huntleigh Technology pic describes a pressure controller which has a means which is sensitive to fluid pressure which is adapted to open a valve when the predetermined pressure in an alternating pressure pad is reached.
  • This pressure controller also comprises a sensor pad which is compressible in dependence upon a patient's weight distribution on the alternating pressure pad. If the patient is not suitably supported, the sensor pad will reduce the escape of fluid from the valve thereby ensuring that more fluid is supplied to the alternating pressure pad until the patient is supported as required.
  • the present invention provides a pressure controller for controlling the pressure in an alternating pressure pad of alternately inflatable sets of cells, comprising an air supply line to each set of cells, a pump arrangement to inflate each set of cells alternately via the air supply lines, and a sensor, the air supply lines being further connected for air to flow through the sensor to exhaust, the sensor being arranged when located beneath the pad to reduce air flow to exhaust from each of the supply lines during inflation of the corresponding sets of cells if the pad is insufficiently inflated to support a patient thereon.
  • the senor comprises respective separate air flow reducing passages for air from each of the supply lines.
  • the air supply lines are connected together via non-return valves to said sensor having a single air flow reducing passage.
  • the senor is provided with a relief valve to the atmosphere which opens at the predetermined minimum pressure to which the pad is required to inflate.
  • the pressure controller further comprises a rotary valve connected to the pump arrangement having an inlet and two outlets, each outlet being connected to an air supply line, the rotary valve connecting each set of cells alternately.
  • the rotary valve can be stopped in a position such that each set of cells is inflated simultaneously as a static pressure pad.
  • the present invention provides a pressure controller for controlling the pressure in a pressure pad comprising one or more air supply lines to the pad, a pump arrangement to inflate the pad via the supply line(s) and a sensor, the air supply line(s) being further connected for air to flow through the sensor to exhaust, the sensor being arranged when located beneath the pad to reduce air flow to exhaust from each supply line during inflation of the pad if the pad is insufficiently inflated to support a patient thereon.
  • FIG. 1 is a schematic representation of a pressure controller in an alternating pressure pad system, the system further comprising a compressor supplying air to the pad via a rotary valve.
  • An alternating pressure pad 1 comprising a first set 2 and a second set 3 of alternately inflatable cells. Both sets of cells are supplied with air from a compressor 4 via a rotary valve 5.
  • a pair of supply lines 6 and 7 lead from the rotary valve 5 to the pad 1 and connect on leaving the other end of the pad 1 to form a single outlet line 8.
  • the supply lines 6 and 7 are provided with non-return valves 9 and 10 respectively.
  • the outlet line 8 is connected to a sensor pad 11 which is located under a patient's mattress.
  • the sensor pad comprises a single compressible tube 12 arranged in a convoluted path. Air passing through the sensor pad 11 is "blocked" by a relief valve 13 pre-set to a predetermined pressure which sets the minimum pressure to which the cells 2 and 3 inflate.
  • the predetermined pressure is dependent upon the dimensions of the cells, i.e in general, the smaller the cells the higher the value and the larger the cells the lower the value.
  • the compressor 4 delivers air to the pad via rotary valve 5 so that each set of cells 2 and 3 is alternately inflated and deflated.
  • the inflation/deflation cycle may repeat over periods varying from two minutes to over twenty minutes.
  • the rotary valve 5 operates so that during inflation of the set of cells 2, air from the set of cells 3, in addition to air from the compressor 4 passes into set of cells 2. This is the "cross-over" point. Further, when, or preferably before, the pressure difference of the air in set of cells 3 over the air from the compressor 4 becomes negligible, the air from set of cells 3 is prevented from passing into set of cells 2. Similarly, during inflation of the other set of cells 3, the air from set of cells 2 is allowed to pass into set of cells 3 for an initial period.
  • the rotary valve 5 includes a stator 14 having an inlet 15 and outlets 16a and 16b and a rotor 17 which is motor driven.
  • the inlet 15 of the stator is connected to compressor 4 and the outlets 16a and 16b are connected to sets of cells 2 and 3 respectively.
  • the rotor 17 is provided with a vent 18 and an inlet port 19. During one revolution of the rotor 17 within the stator 14 first one set of cells and then the other is connected to the compressor 4. However, there is a point in the cycle when both sets of cells 2 and 3 are connected to each other via the rotor
  • the air leaving the pad 1 is only able to pass through the non-return valves 9 and 10 in one direction in order to prevent air leaking back through any deflated cells when the inflated cells are fully inflated.
  • the air in lines 6 and 7 is combined to form a single outlet line 8 before passing into the compressible tube 12 in the sensor pad 11. If the weight of the patient is such that the compressible tube 12 is compressed even though the cells are inflated, the air exhausting to the atmosphere via relief valve 13 will be reduced and the air supplied from the compressor 4 will continue to inflate the cells until the weight of the patient is no longer able to compress tube 12. Thus, air exhausted to the atmosphere now depends upon the compression of the sensor pad 11 and is a function of the weight distribution of the patient. Normal operation occurs when the pressure within the cells rises to the predetermined value and air can pass freely through the sensor pad because the alternating pressure pad is giving the required support to the patient.
  • the senor could comprise separate air flow reducing passages for air from each of the supply lines.
  • the pressure controller depicted in the drawing could easily be adapted for use with a static pressure pad system in either of the following ways:

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)

Abstract

L'invention se rapporte à un régulateur de pression servant à réguler la pression d'un coussin à pression alternative (1) composé de cellules gonflables alternativement (2, 3). Le régulateur de pression comprend une conduite d'alimentation d'air (6, 7) pour chaque ensemble de cellules (2, 3), un dispositif de pompage servant à gonfler chacun des ensembles de cellules (2, 3) alternativement par l'intermédiaire des conduites d'alimentation d'air (6, 7) et un détecteur (11). Le détecteur (11) est disposé sous le coussin (1) pour diminuer le débit d'air évacué par chaque conduite d'alimentation (6, 7) pendant le gonflage des ensembles de cellules correspondants, dans le cas où le coussin (1) n'est pas suffisamment gonflé pour soutenir un malade.
PCT/GB1991/001842 1990-10-26 1991-10-22 Regulateur de pression WO1992007540A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9023319.8 1990-10-26
GB909023319A GB9023319D0 (en) 1990-10-26 1990-10-26 Pressure controller

Publications (1)

Publication Number Publication Date
WO1992007540A1 true WO1992007540A1 (fr) 1992-05-14

Family

ID=10684392

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001842 WO1992007540A1 (fr) 1990-10-26 1991-10-22 Regulateur de pression

Country Status (3)

Country Link
AU (1) AU8744991A (fr)
GB (2) GB9023319D0 (fr)
WO (1) WO1992007540A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560563A1 (fr) 1992-03-09 1993-09-15 Huntleigh Technology Plc Appareil de régulation de pression pour coussin
WO1996033686A1 (fr) * 1995-04-28 1996-10-31 Markhol Pty. Limited Support corporel
AU695870B2 (en) * 1995-04-28 1998-08-27 Australian Healthcare Equipment Pty Ltd A body support
US6098221A (en) * 1997-08-07 2000-08-08 Kloppenborg; Patrick Conforming body support with air chamber and pump chamber
FR2990479A1 (fr) * 2012-05-14 2013-11-15 Askle Sante Dispositif de compresseur a distributeur a fourche optique

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2290706B (en) * 1994-07-01 1998-05-27 Arthur Michael Newsam Gardner Medical device
GB2307402B (en) * 1995-11-23 1999-07-28 Kci Medical Ltd Alternating pressure pads
TW526056B (en) * 2001-03-15 2003-04-01 Huntleigh Technology Plc Inflatable support

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385362A1 (fr) * 1977-03-29 1978-10-27 Welch Hazel Perfectionnements a la literie
WO1989008438A1 (fr) * 1988-03-14 1989-09-21 Huntleigh Technology Plc Verification de pression

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385362A1 (fr) * 1977-03-29 1978-10-27 Welch Hazel Perfectionnements a la literie
WO1989008438A1 (fr) * 1988-03-14 1989-09-21 Huntleigh Technology Plc Verification de pression

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0560563A1 (fr) 1992-03-09 1993-09-15 Huntleigh Technology Plc Appareil de régulation de pression pour coussin
WO1996033686A1 (fr) * 1995-04-28 1996-10-31 Markhol Pty. Limited Support corporel
AU695870B2 (en) * 1995-04-28 1998-08-27 Australian Healthcare Equipment Pty Ltd A body support
US6098221A (en) * 1997-08-07 2000-08-08 Kloppenborg; Patrick Conforming body support with air chamber and pump chamber
FR2990479A1 (fr) * 2012-05-14 2013-11-15 Askle Sante Dispositif de compresseur a distributeur a fourche optique

Also Published As

Publication number Publication date
AU8744991A (en) 1992-05-26
GB9023319D0 (en) 1990-12-05
GB2258808B (en) 1993-12-15
GB9213668D0 (en) 1992-09-16
GB2258808A (en) 1993-02-24

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