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EP0869727B1 - Tampons a pression alternative - Google Patents

Tampons a pression alternative Download PDF

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Publication number
EP0869727B1
EP0869727B1 EP96939211A EP96939211A EP0869727B1 EP 0869727 B1 EP0869727 B1 EP 0869727B1 EP 96939211 A EP96939211 A EP 96939211A EP 96939211 A EP96939211 A EP 96939211A EP 0869727 B1 EP0869727 B1 EP 0869727B1
Authority
EP
European Patent Office
Prior art keywords
pressure
cells
pad
air
pump
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.)
Expired - Lifetime
Application number
EP96939211A
Other languages
German (de)
English (en)
Other versions
EP0869727A1 (fr
Inventor
Peter Charles Stacy
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.)
KCI Medical Ltd
Original Assignee
KCI Medical Ltd
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
Priority claimed from GBGB9523990.1A external-priority patent/GB9523990D0/en
Priority claimed from GBGB9525814.1A external-priority patent/GB9525814D0/en
Application filed by KCI Medical Ltd filed Critical KCI Medical Ltd
Publication of EP0869727A1 publication Critical patent/EP0869727A1/fr
Application granted granted Critical
Publication of EP0869727B1 publication Critical patent/EP0869727B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61G2203/44—General characteristics of devices characterised by sensor means for weight

Definitions

  • This invention relates to alternating pressure pads, particularly for use in nursing patients and others prone to bed sores.
  • Alternating pressure pads are known and have been used in the construction of mattresses, chairs, couches and other patient support devices to improve blood circulation, and thereby reduce the incidence of bed sores.
  • US Patent No. 5,396,671 discloses an alternating pressure pad particularly designed for use as a mattress, in which two sets of inflatable cells are alternately inflated and deflated in order to stimulate blood circulation in a patient lying on the mattress.
  • a sensor pad is located beneath the inflatable cells in order to detect when the cells are insufficiently inflated.
  • One sensor described comprises a flexible tube positioned beneath the mattress. One end of this tube is connected to the inflatable cells and the other discharges to atmosphere, thus providing a continuous leakage path. In the event that inflation pressure in the cells becomes insufficient to maintain the use above a base surface, the sensor tube will be compressed and reduce or entirely cut off the flow of air therethrough.
  • a sensor tube of this kind has the disadvantage that there is a constant loss of air from the system, which necessitates the continuous operation of a higher capacity pump than would be required if such a leak could be avoided.
  • an alternating pressure pad which comprises at least two sets of inflatable cells, an air supply line to each set, a pump to supply pressurised air to the cells via valve means, the valve means being arranged to cause alternate inflation and deflation of each set of cells and a sensor pad for monitoring pressure in the cells, characterised in that the sensor pad, pump and valve means are arranged in a circuit through which pressurised air is circulated and detecting means are provided for detecting a pressure change in the sensor pad or in conduits connecting the pad to the circuit which pressure change is indicative of a reduction in air flow through the sensor pad which is below a predetermined level and for causing said pump to increase air pressure in said sets of cells to restore the air flow above said predetermined level.
  • the reduction in air flow through the sensor pad caused by the patient's weight compressing the sensor pad can be detected by sensing the change of air pressure in the sensor pad or in conduits connecting the pad to the circuit.
  • a sensor pad for use in accordance with the invention can be very simply constructed as an inflatable, flexible envelope comprising a conduit extending back and forth across the pad.
  • the pad can be constructed from films of plastics sheet material welded at their perimeters to form the envelope and forming the conduit by partially welding the films together in a series of parallel weld lines.
  • a first pump is provided to circulate air through the circuit
  • a second, larger capacity pump is connected to the circuit and is operated intermittently to increase inflation pressure in the event that the sensor pad indicates that the sets of cells are insufficiently inflated.
  • an alternating pressure pad which comprises at least two sets of inflatable cells, an air supply line to each set, a first pump to circulate air alternately through a circuit, including said sets, and return air to said first pump, a sensor pad positioned to detect inadequate inflation pressure in said sets.
  • a second pump connected to said circuit and detecting means for detecting a pressure change in the sensor pad, or in air conduits connected thereto and for causing said second pump to be actuated in the event of reduction of pressure below a predetermined level.
  • the inflatable cells are arranged in at least two sets of inter-dispersed cells, e.g. an inter-digitated arrangement as described in US Patent No. 5,396,671.
  • there are one or more layers of indigitated cells preferably contained within a cover which is waterproof and provides an easily cleaned and disinfected surface.
  • Such an arrangement is described in the above US patent and has the advantage that if the cells in the two or more layers are disposed so that a deflating cell is juxtaposed beneath or above an inflating cell, the user of the mattress is less likely to touch the underlying support surface during any part of the alternating cycle.
  • an alternating pressure pad comprising a plurality of inflatable cells arranged in at least two sets of inter-dispersed cells, means for inflating and deflating the cells alternately, a pressure sensor arranged to sense the flow of air through the cells, a pump for inflating the cells and circulating pressurised air through the cells, and control means for controlling the operation of the pump according to the flow of air through the sensor, and to increase air pressure in the cells in the event that pressure in the sensor falls below a predetermined value.
  • the alternating pressure pad comprises two sets 1 and 2 of inflatable cells. These cells are preferably constructed as longitudinal headers 4 inter-digitated finger-like cells 5 having a form as described in US Patent No. 5,396,671.
  • a sensor pad 3 is positioned to lie beneath the mattress formed by the sets 1 and 2.
  • the inflatable sets 1 and 2 are connected to a rotary valve 6 by air input lines 7a and 7b.
  • Rotary valve 6 is fed with air from low power circulation pump 8 or larger powered main inflation pump 9.
  • Circulation pump 8 may be a diaphragm pump having a relatively low output capacity, whereas main inflation pump 9 may be an axial or centrifugal rotary pump of higher output.
  • Check valves 10a and 10b are located between air lines 7a and 7b to prevent inflation air leaking between the air lines 7a and 7b.
  • An air line 11 feeds the pressure pad 3 and a feed-back line 12 returns air to the low output circulation pump 8.
  • Circulation pump 8 feeds air along air line 13 and air line 14 to the rotary valve 6.
  • Sensor pad includes a flexible, compressible tube 15.
  • Rotary valve 6 is driven by an electric motor (not shown), at a speed which is adjustable to provide the desired alternating supply of air to pressure lines 7a and 7b. The rotation speed may be altered to provide a desired delay period between inflation and deflation period.
  • the rotary valve 6 may include a position in which both sets of cells 1 and 2 are in communication, so that the inflated set equalises pressure with the deflated set, before the set to be deflated is partially or fully connected in a further position when it vents to atmosphere.
  • This arrangement ensures a saving in the volume of air required to be fed to the circuit and thus reduces the air output capacity required from the pumps. It also reduces the pressure required in the line 12 when starting up the main pump 9 for inflation of previously deflated cells.
  • the circuit also includes a pressure limit valve 16, which bridges the feed-back line 12 with the input line 14 to the valve 6.
  • the purpose of the pressure limit valve 16 is to leak to atmosphere in the event that the pressure in the circuit reaches an unacceptably high level.
  • the pressure limit valve may connect the feed back line 12 with the input line 11, as shown in Figure 3.
  • a pressure sensitive switch 17 is located in the feed-back line 12 and is arranged to sense a reduction in pressure in the feed-back line 12. In the event of a reduction in pressure in this line, switch 17 causes the electrical feed to the main inflation pump 9 to be actuated, thereby causing the main inflation pump to feed air to the input line 14.
  • the system works in the following manner.
  • air under pressure will be supplied alternately by the pump 8 to sets 1 and 2.
  • Pump 9 is normally actuated only on start up of the apparatus. The air from one or both pumps enters the cells alternately, and returns to the circulation pump 8 via the feed-back line 12.
  • the tube 15 will collapse and close off the passage of air through the line 12. This will cause the pressure to fall in the feed-back line 12 which will be sensed by the pressure switch 17.
  • the main inflation pump 9 On actuation of the switch 17, the main inflation pump 9 will be actuated and this will supply air along the line 12 to the rotary valve 6 and restore the pressure within the sets 1 and/or 2.
  • switch 17 is preferably adjusted so that the switch is held in the off position when the pressure in the feed-back line 12 is sufficient to indicate a normal flow of air through line 12.
  • switch 17 may be arranged to close under a spring-bias to cause activation of the pump 9.
  • the sensor pad 3 comprises an inflatable envelope 21, supported on a backing sheet 22.
  • the backing sheet 22 is preferably a sheet of plastics material which has a dimension X-X approximately corresponding to the width of a bed or other suitable base support, intended to support the inflatable mattress.
  • Backing sheet 22 is fitted with fixing means such as press-studs 23, attached through a reinforcing strip 24.
  • the fastening means 23 are intended to be attached to the surface of the bed or other underlying support for the inflatable mattress, under a moderate lateral tension designed to keep the surface of the backing sheet 22 flat, and the pressure pad 21 unkinked.
  • Envelope 21 is formed with inlet and outlet connectors 25 and 26 for connection with the air line 11 and feed-back line 12.
  • the tube effectively passing between the connectors 25 and 26 consists of an elongated tube formed by partially welding thermoplastic sheets forming the envelope 21 along weld lines 27 and 28, thereby forming an elongated tube in zig-zag formation within the envelope 21.
  • the over-pressure valve 16 prevents the sacs from being raised to an unacceptably high pressure, should there be an unexpected blockage in the circuit.
  • the pressure limit valve is conveniently housed together with the rotary valve 6, and the air switch 17 in the same casing, preferably together with one or both pumps. Alternatively, the pressure limit switch is located adjacent the mattress air input or feed back connection lines.
  • the circulation pump 8 is preferably a diaphragm-type pump which has the advantage of requiring low power and creating a low level of noise.
  • the pressure relief may be set to relieve pressure within the system at a pressure of about 70 mm Hg water gauge.
  • the rotary valve can also be provided with a setting in which both inflatable cells sets are inflated, and with no leakage to atmosphere.
  • the main electrical supply to the pump can be disconnected and the patient may be transported from one part of the hospital to another, while comfortably supported on the inflated mattress.
  • the main inflation pump will only operate intermittently. This has the following advantages:
  • Figure 3 shows a modification of the circuit shown in Figure 1.
  • the air circuit is the same as in Figure 1 with the following changes.
  • the same reference numerals are used for parts which are the same as those shown in Figure 1,
  • a pressure relief valve is provided by the line 36, which bridges air lines 11 and 12 and has a pressure limit valve 16 in the line 36.
  • This pressure relief valve 16 functions in exactly the same way as the valve 16 in Figure 1.
  • the pump 8a will be a larger output pump than the pump 8 in Figure 1, and may, for example, be a pump able to operate at different speeds to increase the air output.
  • a pressure-sensitive control system 30 is provided. This system will be activated if the pressure of air flowing through the sensor pad is restricted by the patient's weight. Corrective action will then be taken automatically.
  • the control system comprises an air flow restrictor 31, connected to the inlet to the pump 8a.
  • the control system also includes a control assembly 32.
  • the assembly includes a one-way valve 33, connected to the air inlet line to the pump 8a between the restrictor 31 and the pump 8a.
  • Valve 33 is under the control of a pressure-sensitive switch 34 and is acted on by a seal or plate 35.
  • air is pumped by the single pump 8a at, say, 5 litres per minute, to the rotary valve 6 and passed alternately to the two cell sets. If the weight of the patient causes the sensor line to be constricted, a small portion of air is drawn via restrictor 31 to deflate valve 34, and so open valve 33. Air is now drawn into the circuit from atmosphere through valve 33, and increases the flow rate to the cell sets until the flow rate is back to the intended level, whereupon the control system reverts to the sealed condition. If the sensor pad becomes completely blocked, air will flow via the bypass line and valve 16 to open the control system.
  • the pump 8a is a two speed pump and the air circuit is as shown in Figure 3 except for the pressure-sensitive control system.
  • the feed-back line 12 incorporates an air operated switch 40, set to reduce the voltage to the pump when the pressure reaches approximately 50 mm Hg and increase the voltage when the pressure falls below approximately 25 mm Hg.
  • the air switch 40 is thrown and the pump then runs at full speed, drawing air partly from the atmosphere via a valve 43 and partly by the restrictor 31.

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)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Inorganic Insulating Materials (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Finger-Pressure Massage (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • Massaging Devices (AREA)
  • Percussion Or Vibration Massage (AREA)

Claims (10)

  1. Coussin à pression alternante qui comprend au moins deux ensembles de cellules gonflables (1, 2), une ligne d'alimentation en air (7a, 7b) vers chaque ensemble, une pompe (8, 8a) pour fournir de l'air sous pression aux cellules par l'intermédiaire de moyens de vanne (6), les moyens de vanne étant agencés pour provoquer un gonflage et un dégonflage alternés de chaque ensemble de cellules et un coussin détecteur (3) destiné à surveiller la pression dans les cellules, caractérisé en ce que le coussin détecteur, la pompe et les moyens de vanne sont disposés dans un circuit dans lequel de l'air sous pression est mis en circulation, et des moyens de détection (17, 30, 40) sont prévus en vue de détecter un changement de pression dans le coussin détecteur ou dans les conduites reliant le coussin au circuit, lequel changement de pression est indicatif d'une réduction de la circulation d'air dans le coussin détecteur sous un niveau prédéterminé et en vue d'amener ladite pompe à augmenter la pression d'air dans lesdits ensembles de cellules afin de rétablir la circulation d'air au-dessus dudit niveau prédéterminé.
  2. Coussin à pression selon la revendication 1, dans lequel le coussin détecteur comprend une enveloppe souple, gonflable.
  3. Coussin à pression selon la revendication 1 ou 2, dans lequel le coussin détecteur comprend un tube allongé qui serpente d'avant en arrière au-dessous du coussin à pression.
  4. Coussin à pression selon les revendications 2 ou 3, dans lequel le coussin détecteur est positionné en utilisation au-dessous d'au moins l'un des ensembles de cellules gonflables et une circulation d'air réduite dans le coussin détecteur est indicative d'une pression de gonflage insuffisante dans les ensembles de cellules gonflables.
  5. Coussin à pression selon l'une quelconque des revendications précédentes, dans lequel les cellules des différents ensembles sont intercalées les unes avec les autres.
  6. Coussin à pression alternante qui comprend au moins deux ensembles de cellules gonflables (1, 2), une ligne d'alimentation en air (7a, 7b) vers chaque ensemble, une première pompe (8) destinée à fournir de l'air auxdits ensembles et un coussin détecteur (3) destiné à surveiller la pression dans les cellules, caractérisé en ce que le coussin détecteur et la première pompe sont disposés dans un circuit dans lequel de l'air sous pression est mis en circulation, dans lequel une seconde pompe (9) est reliée audit circuit et des moyens de détection (17) destinés à détecter un changement de pression dans le coussin détecteur ou les conduites d'air, sont reliés à celle-ci, lesdits moyens de détection étant agencés pour amener ladite seconde pompe à être mise en oeuvre pour augmenter la pression de gonflage.
  7. Coussin à pression selon la revendication 6, dans lequel ledit changement de pression est indicatif d'une pression de gonflage insuffisante dans lesdits ensembles de cellules.
  8. Coussin à pression selon la revendication 7, dans lequel la première pompe est conçue pour mettre en circulation de l'air dans le circuit et la seconde pompe est conçue pour être mise en oeuvre de façon intermittente lorsque le coussin détecteur détecte une pression de gonflage insuffisante dans lesdits ensembles de cellules.
  9. Coussin à pression selon l'une quelconque des revendications 6 à 8, dans lequel les cellules des différentes cellules sont intercalées les unes avec les autres.
  10. Coussin à pression selon l'une quelconque des revendications 6 à 9, dans lequel le coussin détecteur comprend un tube souple qui serpente d'avant en arrière afin de former un coussin pratiquement plat.
EP96939211A 1995-11-23 1996-11-25 Tampons a pression alternative Expired - Lifetime EP0869727B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9523990 1995-11-23
GBGB9523990.1A GB9523990D0 (en) 1995-11-23 1995-11-23 Alternating pressure pad
GBGB9525814.1A GB9525814D0 (en) 1995-12-18 1995-12-18 Alternative pressure pad
GB9525814 1995-12-18
PCT/GB1996/002895 WO1997018737A1 (fr) 1995-11-23 1996-11-25 Tampons a pression alternative

Publications (2)

Publication Number Publication Date
EP0869727A1 EP0869727A1 (fr) 1998-10-14
EP0869727B1 true EP0869727B1 (fr) 2001-11-07

Family

ID=26308167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96939211A Expired - Lifetime EP0869727B1 (fr) 1995-11-23 1996-11-25 Tampons a pression alternative

Country Status (7)

Country Link
EP (1) EP0869727B1 (fr)
AT (1) ATE208156T1 (fr)
CA (1) CA2238413C (fr)
DE (1) DE69616821T2 (fr)
DK (1) DK0869727T3 (fr)
PT (1) PT869727E (fr)
WO (1) WO1997018737A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW526056B (en) * 2001-03-15 2003-04-01 Huntleigh Technology Plc Inflatable support
GB0205924D0 (en) * 2002-03-14 2002-04-24 Huntleigh Technology Plc Inflatable support
US7846141B2 (en) 2002-09-03 2010-12-07 Bluesky Medical Group Incorporated Reduced pressure treatment system
GB0224986D0 (en) 2002-10-28 2002-12-04 Smith & Nephew Apparatus
GB0325129D0 (en) 2003-10-28 2003-12-03 Smith & Nephew Apparatus in situ
US7128735B2 (en) 2004-01-02 2006-10-31 Richard Scott Weston Reduced pressure wound treatment appliance
US8100887B2 (en) 2004-03-09 2012-01-24 Bluesky Medical Group Incorporated Enclosure-based reduced pressure treatment system
US7776028B2 (en) 2004-04-05 2010-08-17 Bluesky Medical Group Incorporated Adjustable overlay reduced pressure wound treatment system
US8062272B2 (en) 2004-05-21 2011-11-22 Bluesky Medical Group Incorporated Flexible reduced pressure treatment appliance
US7708724B2 (en) 2004-04-05 2010-05-04 Blue Sky Medical Group Incorporated Reduced pressure wound cupping treatment system
US10058642B2 (en) 2004-04-05 2018-08-28 Bluesky Medical Group Incorporated Reduced pressure treatment system
US7909805B2 (en) 2004-04-05 2011-03-22 Bluesky Medical Group Incorporated Flexible reduced pressure treatment appliance
US7998125B2 (en) 2004-05-21 2011-08-16 Bluesky Medical Group Incorporated Hypobaric chamber treatment system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8805961D0 (en) * 1988-03-14 1988-04-13 Huntleigh Technology Plc Pressure controller
GB9311069D0 (en) * 1993-05-23 1993-07-14 British Astec Medical Alternating pressure pad

Also Published As

Publication number Publication date
DE69616821T2 (de) 2002-04-11
EP0869727A1 (fr) 1998-10-14
CA2238413A1 (fr) 1997-05-29
WO1997018737A1 (fr) 1997-05-29
DE69616821D1 (de) 2001-12-13
PT869727E (pt) 2002-04-29
DK0869727T3 (da) 2002-01-07
ATE208156T1 (de) 2001-11-15
CA2238413C (fr) 2008-01-08

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