WO1990002927A1 - Method and device for weighing, especially of seriously ill patients confined to bed - Google Patents

Method and device for weighing, especially of seriously ill patients confined to bed Download PDF

Info

Publication number
WO1990002927A1
WO1990002927A1 PCT/SE1989/000476 SE8900476W WO9002927A1 WO 1990002927 A1 WO1990002927 A1 WO 1990002927A1 SE 8900476 W SE8900476 W SE 8900476W WO 9002927 A1 WO9002927 A1 WO 9002927A1
Authority
WO
WIPO (PCT)
Prior art keywords
mattress
air
compressed
patient
bed
Prior art date
Application number
PCT/SE1989/000476
Other languages
French (fr)
Inventor
Albert BROOMÉ
Original Assignee
Brava Patent Och Invent Hb
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 Brava Patent Och Invent Hb filed Critical Brava Patent Och Invent Hb
Publication of WO1990002927A1 publication Critical patent/WO1990002927A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G5/00—Weighing apparatus wherein the balancing is effected by fluid action
    • G01G5/006—Weighing apparatus wherein the balancing is effected by fluid action with pneumatic means
    • 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
    • G01G19/445—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons in a horizontal position

Definitions

  • the present invention relates to a method for weigh- ing, especially of seriously ill patients confined to bed, by means of an inflatable mattress placed in the bed under the patient.
  • the object of the present invention is to use an inflatable mattress in a completely diffe ⁇ rent, simpler manner for rapid weighing of the patient.
  • the object is achieved in that a compressed-air source is connected to the mattress, that air is supplied to the mattress until a pressure balancing the weight of the pa ⁇ tient has been obtained, that the compressed-air source is disconnected and a previously measured, exact quantity of air is supplied to the mattress, and that the change of pressure caused by the load of the patient on the exact quantity of air supplied to the mattress is measured and converted into weight.
  • the invention also relates to a device for carrying the weighing method into effect, said device comprising a compressor driven by an electric motor; a compressed-air container; a multi-way valve connectible to the mattress and adapted, upon actuation in a first position, to con ⁇ nect the compressor to the compressed-air container so as to charge the latter with a fixed quantity of air, in a second position to disconnect the compressed-air container and connect the compressor to the mattress for supply of air to the latter so as to balance the patient's load on the mattress, in a third position to disconnect the com ⁇ pressor and connect the compressed-air container to the mattress so as to convey the fixed quantity of air to the latter, and in a fourth position to disconnect the com ⁇ pressed air container; means adapted to measure the change of pressure imparted by the patient's load on the mattress to the exact quantity of air supplied to the mattress and convert the measurement result into weight and indicate the latter; and a valve device for emptying the mattress of air.
  • the mattress 10 may be of conventional type and, actually, forms a part of the hospital bed since it is placed therein before the patient is put to bed. Con ⁇ sequently, each bed has its own mattress. Naturally, the mattress 10 has to be completely air-tight, and it has a connection hose 11 for supplying and emptying of air. In its free end, the hose 11 has a suitable quick coupling.
  • the valve 14 is provided with an outlet which, by means of a conduit 25, is connectible to the connection 11 of the mattress 10. Furthermore, the valve 14 has an inlet which, by means of a conduit 26, is connected to a compressor 15
  • the compressor 15 may be connected to the compressed-air container 19 or the mattress 10 or, in another position, connect the compressed-air container 19 to the mattress 10 while the compressor 15 is disconnected. In yet another position, all the inlets and outlets are blocked in a con ⁇ ventional manner.
  • the compressor 15 and its drive motor are preferably built together, for which reason the motor is not shown in detail in the drawing.
  • a switch 17 is ar ⁇ ranged to switch the motor on and off.
  • the multi-way valve 14 may, in a simple embodiment, be manually operated, but an electronic control unit 18 is preferred.
  • the compressed- air container 19 is of conventional type and provided with a pressure gauge 20, e.g. a manometer.
  • a pressure gauge 24 is adapted to control the air pressure in the mattress 10, an indicating device 21 being connected to the pressure gauge and, preferably digitally, showing the measured pressure.
  • a transducer 25 is also connected to the pressure gauge 24 and is adapted to convert the mea ⁇ sured pressure into weight indicated by the digitial indi- eating device 22.
  • the pressure gauge 24 is connected to the outlet conduit 25 of the valve 14, and both are joined by means of a combined quick coupling and safety device 23 which is connectible to the quick coupling of the mattress connection 11.
  • the device described above is used in the following manner for weighing of a bed patient.
  • the trolley 12 is wheeled up to the bed with the patient lying on the empty mattress 10 placed in the bed.
  • the mattress 10 may still contain air from a previous weighing, but this in no way influences the method for weighing according to the inven ⁇ tion.
  • the connection 11 of the mattress 10 is then con ⁇ nected to the coupling 23 in the trolley and the compres ⁇ sor motor is started by means of the switch 17.
  • the valve 14 is set in such a position that the compressed air gene ⁇ rated by the compressor 15 is supplied to the compressed- air container 19 via the conduits 26 and 27, until a pre ⁇ determined quantity of air has been supplied, which is in ⁇ dicated by the pressure gauge 20.
  • the valve 14 is reversed to supply the mattress 10 with compressed air via the conduits 26, 25 and 11.
  • the mattress 10 is inflat ⁇ ed to such an extent that the load of the patient lying thereon is balanced, i.e. the patient is lifted by means of the mattress 10 just so high that he is clear of the underlying structure.
  • This balancing position is sensed by the pressure sensor 24 functioning as a transducer and is shown by, for example, a zero in the window of the indi ⁇ cating device 21.
  • the valve 14 is reversed so that the compressor 15 is disconnected and the mattress 10 is connected to the compressed-air container 19 via the conduits 11, . 25, 27.
  • the exactly measured quantity of air in the container 19 flows into the mattress, where ⁇ upon the valve 14 is closed and the pressure gauge 24 senses the pressure in the mattress 10, which differs from the pressure in the compressed-air container 19.
  • the change of pressure can be read on the indicating means 21 but, being of less interest, is instead transmitted to the transducer 25 which converts the obtained value into weight, e.g. in kilograms, shown digitally by the indicat ⁇ ing device 22.
  • the air in the mattress 10 is discharged, e.g. by actuation of the coupling or safety valve 23 or another outlet valve of the mattress or its connection 11.
  • the emptying of the mattress 10 is carried out such that the patient is slowly lowered towards the underlying structure, and that no noise is produced.
  • the weighing may be carried out manually and the valve 14 changed when predetermined va ⁇ lues are indicated by the pressure gauge 20 and the indi ⁇ cating device 21.
  • setting and resetting of the valve 14 may be carried out by means of the electronic unit 18 which is then connected not only to the valve 14 but also to the pressure gauge-and the switch. In that case, the person weighing the patient, after having connected the mattress 10 to the trolley, only has to actuate a switch, whereupon all the necessary changes are carried out automatically until the weight is shown by the indicating device 22.
  • the invention is especially applicable to the weigh ⁇ ing of patients, but may also be used for weighing objects which because of their weight or cumbersome nature are difficult to place on a weighing machine.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Invalid Beds And Related Equipment (AREA)

Abstract

In order to weigh seriously ill patients confined to bed, one places beforehand an inflatable mattress (10) in the bed under the patient. When weighing is carried out, the mattress (10) is inflated with compressed air until the load of the patient is balanced. The compressed-air supply is interrupted, and a previously measured exact quantity of air is supplied to the mattress (10), whereupon the change of pressure caused by the patient's load on the exact quantity of air supplied to the mattress is measured and converted into weight. A mobile device for carrying the weighing method into effect comprises a compressor (15) driven by an electric motor, a compressed-air container (19), a multi-way valve (14) connectible to the mattress (10) and arranged to connect the compressor (15) to either the compressed-air container (19) or the mattress (10), or the compressed-air container (19) to the mattress (10), as well as means for measuring, converting and indicating.

Description

METHOD AND DEVICE FOR WEIGHING, ESPECIALLY OF SERIOUSLY ILL PATIENTS CONFINED TO BED
The present invention relates to a method for weigh- ing, especially of seriously ill patients confined to bed, by means of an inflatable mattress placed in the bed under the patient.
It is of the utmost importance that the weight of an unconscious or seriously ill patient confined to bed is checked at regular intervals. Admittedly, the patient's weight can be checked by carefully recording the intake and discharge of fluid, but this measure is often not suf¬ ficient and, furthermore, impaired by errors. For the weighing, one is reduced to using the expensive, special weighing machines available on the market and usually con¬ sisting of stands which are placed beside the ends of the bed, and a hammock-resembling support which can be sus¬ pended from these ends and on which the patient is placed by at least two nurses. In most cases, this is very taxing for the patient as well as for the nurses, for which rea¬ son weighing of patients is only carried out when abso¬ lutely necessary.
For the weighing of bed patients, use has previously been made of an inflatable pad (US-A-3,795,284) which serves to define a recess into which a portable support is moved, by means of which it is thereafter possible to car¬ ry out the weighing. The object of the present invention is to use an inflatable mattress in a completely diffe¬ rent, simpler manner for rapid weighing of the patient. The object is achieved in that a compressed-air source is connected to the mattress, that air is supplied to the mattress until a pressure balancing the weight of the pa¬ tient has been obtained, that the compressed-air source is disconnected and a previously measured, exact quantity of air is supplied to the mattress, and that the change of pressure caused by the load of the patient on the exact quantity of air supplied to the mattress is measured and converted into weight.
With this method, a nurse may rapidly and easily weigh the patient without in the least discomforting him. Theoretically, it would of course be conceivable to leave out the final supply of the exact quantity of air and to weigh only by means of compressed-air supply via a volu¬ meter, but this has been found, in actual practice, to en¬ tail considerable technical difficulties and inaccuracies, which is probably the reason why the method for weighing by means of air has not been used.
The invention also relates to a device for carrying the weighing method into effect, said device comprising a compressor driven by an electric motor; a compressed-air container; a multi-way valve connectible to the mattress and adapted, upon actuation in a first position, to con¬ nect the compressor to the compressed-air container so as to charge the latter with a fixed quantity of air, in a second position to disconnect the compressed-air container and connect the compressor to the mattress for supply of air to the latter so as to balance the patient's load on the mattress, in a third position to disconnect the com¬ pressor and connect the compressed-air container to the mattress so as to convey the fixed quantity of air to the latter, and in a fourth position to disconnect the com¬ pressed air container; means adapted to measure the change of pressure imparted by the patient's load on the mattress to the exact quantity of air supplied to the mattress and convert the measurement result into weight and indicate the latter; and a valve device for emptying the mattress of air.
The invention will be described in detail below, re¬ ference being had to the accompanying drawing showing schematically an embodiment. The device according to the invention for weighing, especially of seriously ill patients confined to bed, com¬ prises two main constituents: an inflatable mattress 10 and a device in the form of a trolley 12 which runs on wheels 13 and contains all the parts necessary for the weighing. The mattress 10 may be of conventional type and, actually, forms a part of the hospital bed since it is placed therein before the patient is put to bed. Con¬ sequently, each bed has its own mattress. Naturally, the mattress 10 has to be completely air-tight, and it has a connection hose 11 for supplying and emptying of air. In its free end, the hose 11 has a suitable quick coupling. A multi-way valve 14, which may be of a type avail¬ able on the market, is mounted in the trolley 12. The valve 14 is provided with an outlet which, by means of a conduit 25, is connectible to the connection 11 of the mattress 10. Furthermore, the valve 14 has an inlet which, by means of a conduit 26, is connected to a compressor 15
* driven by an electric motor, and a combined inlet and out¬ let which, by means of a conduit 27, is connected to a compressed-air container 19. By actuating the valve 14, the compressor 15 may be connected to the compressed-air container 19 or the mattress 10 or, in another position, connect the compressed-air container 19 to the mattress 10 while the compressor 15 is disconnected. In yet another position, all the inlets and outlets are blocked in a con¬ ventional manner. The compressor 15 and its drive motor are preferably built together, for which reason the motor is not shown in detail in the drawing. A switch 17 is ar¬ ranged to switch the motor on and off. The multi-way valve 14 may, in a simple embodiment, be manually operated, but an electronic control unit 18 is preferred. The compressed- air container 19 is of conventional type and provided with a pressure gauge 20, e.g. a manometer. Another pressure gauge 24 is adapted to control the air pressure in the mattress 10, an indicating device 21 being connected to the pressure gauge and, preferably digitally, showing the measured pressure. A transducer 25 is also connected to the pressure gauge 24 and is adapted to convert the mea¬ sured pressure into weight indicated by the digitial indi- eating device 22. By means of a conduit 28, the pressure gauge 24 is connected to the outlet conduit 25 of the valve 14, and both are joined by means of a combined quick coupling and safety device 23 which is connectible to the quick coupling of the mattress connection 11.
The device described above is used in the following manner for weighing of a bed patient. The trolley 12 is wheeled up to the bed with the patient lying on the empty mattress 10 placed in the bed. The mattress 10 may still contain air from a previous weighing, but this in no way influences the method for weighing according to the inven¬ tion. The connection 11 of the mattress 10 is then con¬ nected to the coupling 23 in the trolley and the compres¬ sor motor is started by means of the switch 17. The valve 14 is set in such a position that the compressed air gene¬ rated by the compressor 15 is supplied to the compressed- air container 19 via the conduits 26 and 27, until a pre¬ determined quantity of air has been supplied, which is in¬ dicated by the pressure gauge 20. Then, the valve 14 is reversed to supply the mattress 10 with compressed air via the conduits 26, 25 and 11. The mattress 10 is inflat¬ ed to such an extent that the load of the patient lying thereon is balanced, i.e. the patient is lifted by means of the mattress 10 just so high that he is clear of the underlying structure. This balancing position is sensed by the pressure sensor 24 functioning as a transducer and is shown by, for example, a zero in the window of the indi¬ cating device 21. At this moment, the valve 14 is reversed so that the compressor 15 is disconnected and the mattress 10 is connected to the compressed-air container 19 via the conduits 11,. 25, 27. Then, the exactly measured quantity of air in the container 19 flows into the mattress, where¬ upon the valve 14 is closed and the pressure gauge 24 senses the pressure in the mattress 10, which differs from the pressure in the compressed-air container 19. The change of pressure can be read on the indicating means 21 but, being of less interest, is instead transmitted to the transducer 25 which converts the obtained value into weight, e.g. in kilograms, shown digitally by the indicat¬ ing device 22. When the weight has been recorded, the air in the mattress 10 is discharged, e.g. by actuation of the coupling or safety valve 23 or another outlet valve of the mattress or its connection 11. Naturally, it is important that the emptying of the mattress 10 is carried out such that the patient is slowly lowered towards the underlying structure, and that no noise is produced. As indicated above, the weighing may be carried out manually and the valve 14 changed when predetermined va¬ lues are indicated by the pressure gauge 20 and the indi¬ cating device 21. For higher safety and greater ease of operation, setting and resetting of the valve 14 may be carried out by means of the electronic unit 18 which is then connected not only to the valve 14 but also to the pressure gauge-and the switch. In that case, the person weighing the patient, after having connected the mattress 10 to the trolley, only has to actuate a switch, whereupon all the necessary changes are carried out automatically until the weight is shown by the indicating device 22.
The invention is especially applicable to the weigh¬ ing of patients, but may also be used for weighing objects which because of their weight or cumbersome nature are difficult to place on a weighing machine.

Claims

1. Method for weighing, especially of seriously ill patients confined to bed, by means of an inflatable mat¬ tress (10) placed in the bed under the patient, c h a ¬ r a c t e r i s e d in that a compressed-air source (15) is connected to the mattress (10), that air is supplied to the mattress until a pressure balancing the weight of the patient has been obtained, that the compressed-air source (15) is disconnected and a previously measured, exact quantity of air is supplied to the mattress (10), and that the change of pressure caused by the load of the patient on the previously measured quantity of air supplied to the mattress is measured and converted into weight.
2. Device for weighing, especially of seriously ill patients confined to bed, by means of an inflatable mat¬ tress (10) placed in the bed under the patient, c h a ¬ r a c t e r i s e d in that it comprises a compressor (15) driven by an electric motor; a compressed-air con¬ tainer (19); a multi-way valve (14) connectible to the mattress (10) and adapted, upon actuation in a first posi¬ tion, to connect the compressor (15) to the compressed-air container (19) so as to charge the latter with a fixed quantity of air, in a second position to disconnect the compressed-air container (19) and connect the compressor (15) to the mattress (10) for supply of air to the latter so as to balance the patient's load on the mattress, in a third position to disconnect the compressor (15) from the mattress (10) and connect the compressed-air container
(19) to the mattress (10) so as to convey the fixed quan¬ tity of air to the latter, and in a fourth position to disconnect the compressed-air container (19); means (24, 25; 21, 22) adapted to measure the change of pressure im- parted by the patient's load on the mattress (10) to the fixed quantity of air supplied to the mattress, and to convert the measurement results into weight and indicate the latter; and a valve device (24) for emptying the mat¬ tress of air.
3. Device as claimed in claim 2, c h a r a c t e r ¬ i s e d in that transducers (24, 25; 17, 18) with control equipment are adapted to monitor the filling of the com¬ pressed-air container (19) and the mattress (10), and to switch over automatically when predetermined pressure va¬ lues have been obtained.
4. Device as claimed in claim 2 or 3, c h a r a c - t e r i s e d in that all the component parts, with the exception of the mattress (10), are mounted on a trolley (12).
PCT/SE1989/000476 1988-09-09 1989-09-07 Method and device for weighing, especially of seriously ill patients confined to bed WO1990002927A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8803176A SE462002B (en) 1988-09-09 1988-09-09 KEEPING AND DEVICE MEASURING IN PARTICULAR BLACK SICK SINGLE PATIENTS
SE8803176-0 1988-09-09

Publications (1)

Publication Number Publication Date
WO1990002927A1 true WO1990002927A1 (en) 1990-03-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000476 WO1990002927A1 (en) 1988-09-09 1989-09-07 Method and device for weighing, especially of seriously ill patients confined to bed

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WO (1) WO1990002927A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0482267A1 (en) * 1990-10-26 1992-04-29 Gram Corporation Method for weighing human body and the like
WO1993009411A1 (en) * 1991-11-07 1993-05-13 Hyun Suk Yang Waterproof sheet to draw infant developing curve
US5626187A (en) * 1993-12-14 1997-05-06 Nilsson; Haakan Heat-exchanger tube
US20140224551A1 (en) * 2013-02-08 2014-08-14 Raf Technology, Inc. Smart Phone Scale
US9146148B2 (en) 2007-09-13 2015-09-29 Raf Technology, Inc. Dynamic thickness adaptation for an in-line scale
US9564849B2 (en) 2013-05-06 2017-02-07 Raf Technology, Inc. Scale for weighing flowing granular materials
US9863801B2 (en) 2014-05-01 2018-01-09 Velox Robotics, Llc High speed robotic weighing system
CN112985564A (en) * 2021-02-05 2021-06-18 安玖医疗器械(苏州)有限公司 Method for weighing object on inflatable mattress
US11566934B2 (en) 2016-12-20 2023-01-31 ScaleThings Sp.z.o.o. Weight scales systems and methods

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2954221A (en) * 1957-06-26 1960-09-27 Ohio Commw Eng Co Weighing device
GB972451A (en) * 1962-07-09 1964-10-14 Oxygenaire London Ltd Improvements in or relating to weighing apparatus
US3338323A (en) * 1965-01-12 1967-08-29 Francis Roe C Hydraulic weighing apparatus with rebalancing means for determining load differential
US3722611A (en) * 1970-02-05 1973-03-27 E Tirkkonen Patient scales
US3795284A (en) * 1972-01-03 1974-03-05 M Mracek Portable support and weigher for a bed patient
US4281730A (en) * 1980-01-15 1981-08-04 Swersey Burt L Scale
US4363368A (en) * 1981-03-13 1982-12-14 Health Care Innovations, Inc. Medical patient weighing scale

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2954221A (en) * 1957-06-26 1960-09-27 Ohio Commw Eng Co Weighing device
GB972451A (en) * 1962-07-09 1964-10-14 Oxygenaire London Ltd Improvements in or relating to weighing apparatus
US3338323A (en) * 1965-01-12 1967-08-29 Francis Roe C Hydraulic weighing apparatus with rebalancing means for determining load differential
US3722611A (en) * 1970-02-05 1973-03-27 E Tirkkonen Patient scales
US3795284A (en) * 1972-01-03 1974-03-05 M Mracek Portable support and weigher for a bed patient
US4281730A (en) * 1980-01-15 1981-08-04 Swersey Burt L Scale
US4363368A (en) * 1981-03-13 1982-12-14 Health Care Innovations, Inc. Medical patient weighing scale

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0482267A1 (en) * 1990-10-26 1992-04-29 Gram Corporation Method for weighing human body and the like
WO1993009411A1 (en) * 1991-11-07 1993-05-13 Hyun Suk Yang Waterproof sheet to draw infant developing curve
US5626187A (en) * 1993-12-14 1997-05-06 Nilsson; Haakan Heat-exchanger tube
US9146148B2 (en) 2007-09-13 2015-09-29 Raf Technology, Inc. Dynamic thickness adaptation for an in-line scale
US20140224551A1 (en) * 2013-02-08 2014-08-14 Raf Technology, Inc. Smart Phone Scale
US9091585B2 (en) * 2013-02-08 2015-07-28 Raf Technology, Inc. Smart phone scale that uses the built-in barometric pressure sensor or orientation sensors to calculate weight
US9564849B2 (en) 2013-05-06 2017-02-07 Raf Technology, Inc. Scale for weighing flowing granular materials
US9857214B2 (en) 2013-05-06 2018-01-02 Velox Robotics, Llc Scale for weighing parcels
US9863801B2 (en) 2014-05-01 2018-01-09 Velox Robotics, Llc High speed robotic weighing system
US11566934B2 (en) 2016-12-20 2023-01-31 ScaleThings Sp.z.o.o. Weight scales systems and methods
CN112985564A (en) * 2021-02-05 2021-06-18 安玖医疗器械(苏州)有限公司 Method for weighing object on inflatable mattress
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

Also Published As

Publication number Publication date
SE8803176L (en) 1990-03-10
SE8803176D0 (en) 1988-09-09
SE462002B (en) 1990-04-23

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