WO2009044201A1 - Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress - Google Patents
Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress Download PDFInfo
- Publication number
- WO2009044201A1 WO2009044201A1 PCT/GB2008/050891 GB2008050891W WO2009044201A1 WO 2009044201 A1 WO2009044201 A1 WO 2009044201A1 GB 2008050891 W GB2008050891 W GB 2008050891W WO 2009044201 A1 WO2009044201 A1 WO 2009044201A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mattress
- pressure
- fluid
- load
- controller
- Prior art date
Links
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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/44—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G5/00—Weighing apparatus wherein the balancing is effected by fluid action
- G01G5/04—Weighing apparatus wherein the balancing is effected by fluid action with means for measuring the pressure imposed by the load on a liquid
-
- 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
-
- 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
- Embodiments of the present invention relate to a mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress.
- Inflatable mattresses may be used, for example, within medical premises such as hospitals on hospital beds for the use of patients.
- the weight of a patient may affect the performance and/or perceived comfort of the mattress by the patient as well as the pressure area care when the mattress is filled (inflated) with fluid (such as a gas, for example air) to a predetermined and/or varying pressure.
- fluid such as a gas, for example air
- a mattress pump apparatus controller wherein the controller is arranged to monitor pressure of a fluid in at least some parts of the mattress; detect a change in the pressure due to placement of a load on the mattress; measure a load pressure of the fluid; and determine a weight of the load from the load pressure.
- a mattress can be controlled by the mattress pump apparatus controller (for example, using a mattress pump apparatus) to automatically measure the weight of a load, such as a patient, when the load is placed on the mattress.
- the controller is arranged to determine an initial pressure before the detecting. Determining the weight may comprise determining the weight from the initial pressure and the load pressure.
- the controller is arranged to fill the mattress with a predetermined volume of fluid or to a predetermined pressure before the detecting.
- the mattress is inflated to a certain level (for example, a level that is comfortable for a patient mounting the mattress and/or takes into account the patient's fragility and tissue vulnerability) before the load is placed on the mattress.
- the controller is arranged to add fluid to or remove fluid from the mattress after the measuring. Therefore, the pressure within the mattress is set to, for example, a predetermined level once the load pressure is measured.
- the predetermined pressure may be selected automatically according to the weight of the load and/or the treatment that a patient on the mattress may receive. Alternatively, the predetermined level may be selected by a user such as, for example, a patient on the mattress or a member of medical staff.
- a mattress pump apparatus comprising means for adding and/or removing fluid from a fluid fillable mattress and a controller, wherein the controller is arranged to monitor pressure of a fluid in at least some parts of the mattress; detect a change in the pressure due to placement of a load on the mattress; measure a load pressure of the fluid; and determine a weight of the load from the load pressure.
- fluid fillable mattress comprising a mattress pump apparatus, the mattress pump apparatus comprising means for adding and/or removing fluid from a fluid fillable mattress and a controller, wherein the controller is arranged to monitor pressure of a fluid in at least some parts of the mattress; detect a change in the pressure due to placement of a load on the mattress; measure a load pressure of the fluid; and determine a weight of the load from the load pressure.
- a method of controlling a fluid-fillable mattress comprising monitoring pressure of a fluid in at least some parts of the mattress; detecting a change in the pressure due to placement of a load on the mattress; measuring a load pressure of the fluid; and determining a weight of the load from the load pressure.
- Figure 1 shows a mattress and mattress pump apparatus according to embodiments of the invention
- Figure 2 shows a method of controlling a mattress according to embodiments of the invention
- Figure 3 shows a graph of pressure against time during a method according to embodiments of the invention
- Figure 4 shows a graph of weight against pressure according to embodiments of the invention
- Figure 5 shows a first alternative embodiment of a mattress
- Figure 6 shows a second alternative embodiment of a mattress
- Figure 7 shows a third alternative embodiment of a mattress.
- An embodiment of the invention shown in figure 1 comprises a mattress 100 and mattress pump apparatus 102.
- the mattress pump apparatus 102 comprises a pump 104 for pumping a fluid (for example, air) into the mattress 100, a pressure sensor 106 for measuring the pressure of the fluid in the mattress 106 and a mattress pump apparatus controller 108 for controlling the mattress pump apparatus 102.
- the apparatus 102 may also comprise an interaction device 110 that includes a display and/or an input device.
- the mattress 100 is connected to the apparatus 102 via a fluid conduit 112.
- the conduit 112 which is, for example, a flexible tube, may be permanently or removably connected to the mattress 100 and/or apparatus 102.
- the apparatus may be integrated with (for example, attached directly to or located within) the mattress 100, and as such the conduit 112 may not be required.
- the apparatus 102 can be used to inflate the mattress 100 to an initial fluid pressure, detect when a load is placed on the mattress, calculate the weight of the load and then inflate or deflate the mattress 100 to a selected pressure level.
- a load being placed on the mattress 100 may include, for example, a patient mounting the mattress and lying down on the mattress.
- Embodiments of the mattress 100 are arranged such that fluid pumped into the mattress 100 fills the entire internal volume 114 of the mattress 100.
- the internal volume 114 may be partitioned into two or more sections that may be inflated and deflated independently. Embodiments of such mattresses are described later in this description.
- Figure 2 shows a method of controlling a mattress pump apparatus according to embodiments of the invention.
- the method 200 starts at step 202 where the mattress is inflated to an initial pressure.
- air is pumped into the mattress using the pump 104 via the conduit 112 such that the pressure of the air within the internal volume 114 of the mattress 100 is an initial pressure of 15 mm Hg, as indicated by the pressure sensor 106.
- Figure 3 shows an example of a graph of pressure (in mm Hg) against time during the method 200.
- the initial pressure A is shown to be 15 mm Hg, although other initial pressures may be used.
- step 204 the pressure of the mattress is monitored using the pressure sensor 106.
- step 206 placement of a load on the mattress 206 is detected.
- a load is placed on the mattress at time Tl.
- the pressure of the fluid in the mattress typically reaches a peak at time T2 and then falls, causing a spike at time T2.
- the placement of the load on the mattress is detected, for example, by detecting when the pressure of the fluid in the mattress exceeds a threshold value.
- the threshold value is set at 30 mm Hg.
- the peak at time T2 exceeds the threshold value, and thus the mattress pump apparatus 102 detects the placement of the load on the mattress.
- step 206 shown in figure 2 the method 200 continues to step 208 where the mattress pump apparatus 102 waits for a settling time
- step 212 the weight of the load placed on the mattress is determined as explained below.
- step 214 of the method 200 which follows from step 212, the mattress pump apparatus
- step 216 the method ends at step 216 once the pressure reaches the selected pressure at time T4.
- An example of a method of determining the weight of the load on the mattress comprises using the following formula:
- w is the weight of the load
- A is the initial pressure within the mattress
- B is the measured pressure measured at time T3 in step 210
- c is a scalar.
- the weight is determined according to a linear relationship between the weight of the load and the measured pressure B, as shown in figure 4.
- the scalar c may be dependent on the initial pressure A and/or the type of mattress.
- the scalar c may be determined, for example, experimentally or may be specified with the mattress (for example, specified by the manufacturers of the mattress). In alternative embodiments of the invention, however, there may be other relationships between the weight and the measured pressure B. Additionally or alternatively, other calculations may be performed, such as, for example, determining the weight from both the measured pressure B and the initial pressure A.
- the weight may be displayed on a display device, if any, associated with the mattress pump apparatus 102.
- the selected pressure to which the mattress is inflated in step 214 of the method 200 shown in figure 2, may be specified manually by a user using, for example, an input device associated with the mattress pump apparatus 102.
- the selected pressure may be specified before or after the weight of the load is determined.
- a member of medical staff may specify the selected pressure according to the weight of the patient (being the load on the mattress).
- the selected pressure may be determined automatically based on the weight of the load on the mattress.
- the selected pressure may be determined according to the following table:
- the heavy setting may be a high pressure
- the medium setting may be a medium setting
- the light setting may be a low pressure.
- the selected pressure may be specified or determined based on the weight of the patient, for example, to improve the comfort of the patient on the mattress. In embodiments of the invention where the selected pressure is automatically determined based on the weight of the load, there is no requirement for a user to specify the selected pressure, whether or not in response to the measured weight of the load.
- FIG. 5 shows an example of an alternative embodiment of a mattress 500.
- the mattress 500 comprises a plurality of first chambers 502 that are connected together in such a way that fluid may flow freely between the chambers 502.
- the mattress 500 also comprises a plurality of second chambers 504 that are similarly connected together.
- the chambers 502 are not connected to the chambers 504. Therefore, for example, if one of the chambers 502 is filled with fluid, then the other chambers 502 are also filled with fluid, and the chambers 504 are not filled with fluid (although the chambers 504 may be filled separately, for example by filling one of the chambers
- the chambers 502 are connected together, for example, by a first conduit 506, and the chambers 504 are connected together using a second conduit 508.
- the mattress 500 may be controlled in a loop such that in a first period of time, the chambers 502 are filled with fluid to the selected pressure, and the chambers 504 are empty or are filled or deflated to a lower pressure. Then, the chambers 504 are filled to the selected pressure, and the chambers 502 are deflated to a lower pressure, for a second period of time before returning to the beginning of the loop.
- Such an arrangement may benefit a patient on the bed, for example, by reducing the occurrence of bed sores.
- Figure 6 shows another embodiment of a mattress 600 comprising first chambers 602 connected together using a first conduit 604, and second chambers 606 connected together using a second conduit 608.
- the mattress 600 also comprises a head rest section 610 comprising first head rest chambers 612 and a second head rest chamber 614 (in alternative embodiments of the invention, the mattress 600 may have any number of head rest chambers).
- the first conduit 604 comprises a valve 616 such that when the first chambers 602 are inflated to a certain pressure, the first head rest chambers 612 are inflated to the same pressure, and when the first chambers 602 are subsequently deflated, the first head rest chambers are not deflated. Thus, the pressure inside the first head rest chambers 612 is maintained at a certain pressure.
- the second conduit 608 includes a valve 618 such that the second head rest chamber 614 is maintained at a certain pressure. Therefore, the mattress 600 has a head rest section 610 that is permanently inflated to a certain pressure once the first and second chambers 602 and 606 have been inflated to a certain pressure, which may improve the comfort of a patient on the mattress 600.
- the mattress 600 can be controlled in a loop in a manner similar to that described in respect of the mattress 500 shown in figure 5.
- Figure 7 shows another embodiment of a mattress 700.
- the mattress 700 includes a first mattress section 702 that is similar to the mattress 500 shown in figure 5.
- the mattress also includes a second mattress section 704 comprising first chambers 706 located underneath the first mattress section, and also comprising second chambers 708 being a head rest section.
- the first and second chambers 706 and 708 of the second mattress section are connected together using a conduit 710.
- the second mattress section 704 is maintained at a certain pressure, while the first mattress section is controlled in a loop in a manner similar to that described above with reference to the mattress 500 shown in figure 5. Therefore, there is always an inflated section of the mattress underneath the patient on the mattress 700, which may improve the comfort of the patient.
- chambers may be connected together by reason of the internal structure of the mattresses instead of using conduits between chambers.
- the fluid used to fill the mattress may be a gas, such as, for example, air.
- the mattress may be filled by inflating the mattress with the gas.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2008306594A AU2008306594A1 (en) | 2007-10-05 | 2008-10-02 | Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress |
EP08806707A EP2203092A1 (en) | 2007-10-05 | 2008-10-02 | Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0719478A GB2453371B (en) | 2007-10-05 | 2007-10-05 | Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress |
GB0719478.0 | 2007-10-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009044201A1 true WO2009044201A1 (en) | 2009-04-09 |
Family
ID=38739186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2008/050891 WO2009044201A1 (en) | 2007-10-05 | 2008-10-02 | Mattress pump apparatus controller, mattress pump apparatus, mattress and method of controlling a mattress |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2203092A1 (en) |
AU (1) | AU2008306594A1 (en) |
GB (1) | GB2453371B (en) |
WO (1) | WO2009044201A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2753282A4 (en) * | 2011-11-03 | 2015-08-12 | Shl Group Ab | Mattress system |
EP3072419A1 (en) * | 2015-03-23 | 2016-09-28 | Apex Medical Corp. | Air mattress system and inflation and deflation pressure regulation system and method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9009891B2 (en) * | 2011-09-23 | 2015-04-21 | Hill-Rom Services, Inc. | Automatic patient weight measurement for determining pressure relief set points |
US9655795B2 (en) | 2012-04-10 | 2017-05-23 | Hill-Rom Services, Inc. | Occupant support with a migration sensitive bladder and method for migration detection |
JP6557107B2 (en) * | 2015-09-30 | 2019-08-07 | パラマウントベッド株式会社 | Air mat device and air cell internal pressure control method |
CN108472187A (en) | 2016-12-20 | 2018-08-31 | 测量用具有限公司 | Scale system and method |
CN112985564B (en) * | 2021-02-05 | 2022-11-18 | 安玖医疗器械(苏州)有限公司 | Method for weighing object on inflatable mattress |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0663169A1 (en) * | 1994-01-10 | 1995-07-19 | Span America Medical Systems, Inc. | Automated pressure relief mattress support system |
WO1996024276A1 (en) * | 1995-02-06 | 1996-08-15 | Bcam International, Inc. | Body support with adaptive pressurization |
WO1997036521A1 (en) * | 1996-04-02 | 1997-10-09 | Sytron Corporation | Microprocessor controller and method of controlling low air loss floatation mattress |
WO2003024380A1 (en) * | 2001-09-21 | 2003-03-27 | Sidhil Limited | Mattress or like body supporting device |
US20040133986A1 (en) * | 2001-01-08 | 2004-07-15 | Hayes John H. | Mattress and bedpan cushion system using an air pressure switch and reservoir |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3217818A (en) * | 1964-04-06 | 1965-11-16 | Harvey J Engelsher | Pneumatic weighing device |
JP2762297B2 (en) * | 1989-04-17 | 1998-06-04 | グラム株式会社 | Weight measurement method |
DE69010908T2 (en) * | 1990-10-26 | 1995-03-02 | Gram Corp | Method of weighing the human body or the like. |
-
2007
- 2007-10-05 GB GB0719478A patent/GB2453371B/en not_active Expired - Fee Related
-
2008
- 2008-10-02 AU AU2008306594A patent/AU2008306594A1/en not_active Abandoned
- 2008-10-02 EP EP08806707A patent/EP2203092A1/en not_active Withdrawn
- 2008-10-02 WO PCT/GB2008/050891 patent/WO2009044201A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0663169A1 (en) * | 1994-01-10 | 1995-07-19 | Span America Medical Systems, Inc. | Automated pressure relief mattress support system |
WO1996024276A1 (en) * | 1995-02-06 | 1996-08-15 | Bcam International, Inc. | Body support with adaptive pressurization |
WO1997036521A1 (en) * | 1996-04-02 | 1997-10-09 | Sytron Corporation | Microprocessor controller and method of controlling low air loss floatation mattress |
US20040133986A1 (en) * | 2001-01-08 | 2004-07-15 | Hayes John H. | Mattress and bedpan cushion system using an air pressure switch and reservoir |
WO2003024380A1 (en) * | 2001-09-21 | 2003-03-27 | Sidhil Limited | Mattress or like body supporting device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2753282A4 (en) * | 2011-11-03 | 2015-08-12 | Shl Group Ab | Mattress system |
US11058603B2 (en) | 2011-11-03 | 2021-07-13 | Shl Healthcare Ab | Mattress system |
EP3072419A1 (en) * | 2015-03-23 | 2016-09-28 | Apex Medical Corp. | Air mattress system and inflation and deflation pressure regulation system and method |
Also Published As
Publication number | Publication date |
---|---|
EP2203092A1 (en) | 2010-07-07 |
GB2453371B (en) | 2010-06-23 |
AU2008306594A1 (en) | 2009-04-09 |
GB2453371A (en) | 2009-04-08 |
GB0719478D0 (en) | 2007-11-14 |
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