EP2567636A1 - Support de bras - Google Patents

Support de bras Download PDF

Info

Publication number
EP2567636A1
EP2567636A1 EP12183426A EP12183426A EP2567636A1 EP 2567636 A1 EP2567636 A1 EP 2567636A1 EP 12183426 A EP12183426 A EP 12183426A EP 12183426 A EP12183426 A EP 12183426A EP 2567636 A1 EP2567636 A1 EP 2567636A1
Authority
EP
European Patent Office
Prior art keywords
arm
carrier
support according
spring
arm support
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
EP12183426A
Other languages
German (de)
English (en)
Other versions
EP2567636B1 (fr
Inventor
Ralf De Jong
Paulus Christianus Maria Groenland
Paulus Petrus Hendricus Verstegen
Eric Johannes Arnoldus De Quay
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.)
Focal Meditech Bv
Original Assignee
Focal Meditech Bv
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 Focal Meditech Bv filed Critical Focal Meditech Bv
Publication of EP2567636A1 publication Critical patent/EP2567636A1/fr
Application granted granted Critical
Publication of EP2567636B1 publication Critical patent/EP2567636B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • 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
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/125—Rests specially adapted therefor, e.g. for the head or the feet for arms

Definitions

  • the present invention relates to an arm support, in particular an arm support for use on a wheelchair, but it may also be used on other devices, like a working chair, a carriage or a table.
  • Arm supports are generally known in the art. They may be considered as part of a general class of devices for supporting body parts, often referred to as orthotics or orthosis devices. Arm supports, also mobile arm supports or dynamic arm supports, can be seen as a separate class of active orthotics, distinguished from other classes due to its connection on one side to the fixed world.
  • Dynamic arm supports are mechanic devices that serve to carry the weight of an arm and a hand of a user. They compensate for the weight of the arm and hand, and allow a user to control the motion of their arm and/or hand by transferring a force or their remaining capacity exerted by minimal movement of the shoulder girdle.
  • a general property of dynamic arm supports is that they are connected to the solid world, formed for example by a chair, wheelchair, table or movable support. Since the device follows natural movement of the arm, it is also referred to as exoskeleton. In medical technology, the term active orthosis (device ) may be found as well.
  • a purpose of arm supports is their use to extend the use of the senso-motoric functioning of the user.
  • an arm support is distinguished from a so called robot-manipulator, that takes over human functions as a whole.
  • An arm support thus offers a user more possibilities to use even minimal remaining body functions leading to prolonged health, a higher participation level and more independence.
  • Two types of arm supports may be recognised.
  • First is a traditional Mobile Arm Support (MAS) that encounters the forearm from below. The arm then rests on the support, that balances the bottom side.
  • Second is a so called sling-type, wherein counter-weights compensate for the weight of the arm via counter weights, that act on a sling that supports the arm. All types may be powered or unpowered, by active (e.g. electric engine) or passive (e.g.) spring elements.
  • active e.g. electric engine
  • passive e.g.
  • the invention thereto proposes an arm support for use on a wheelchair, comprising a carrier, connectable to the wheelchair, a first arm-part, pivotally connected to the carrier, a second arm-part, pivotally connected to the first arm-part, comprising a support, such as a scale, for a forearm, a first spring-element, for exerting a force on the first arm-part with respect to the carrier for supporting an upper arm of a user, and a second spring-element, for exerting a force on the second arm-part with respect to a reference outside the second arm part, for supporting a forearm of a user.
  • a support such as a scale
  • first spring-element for exerting a force on the first arm-part with respect to the carrier for supporting an upper arm of a user
  • a second spring-element for exerting a force on the second arm-part with respect to a reference outside the second arm part, for supporting a forearm of a user.
  • the carrier may be connectable to the wheelchair, but it may also form an integrated part thereof.
  • the second arm-part is preferably connected to the end of the first arm-part that faces away from the carrier.
  • the carrier may be directly or indirectly connected to the wheelchair at the position of a shoulder of a user, which may be a different position for each user.
  • the reference may for example be the carrier, or another point that belongs to the fixed world.
  • pivotably is used here to indicate a rotational movement about one or more axis of rotation.
  • the arm support according to the invention provides an improved support for the forearm of a user with respect to the prior art.
  • the use of a reference point for the second spring element outside the second arm enables to minimise the construction and volume of the second arm part, which results in an increased freedom of movement for the user.
  • the first arm-part comprises a parallelogram.
  • the parallelogram enables to apply a force on the second arm-part which is independent of the angle the first arm-part has with respect to the carrier.
  • the force applied by the second spring-element in order to counterbalance the weight of the fore-arm can be controlled separately, and both arm-parts are suspended completely independent.
  • the leg of the parallelogram that opposite to the leg coupled to the carrier forms an extension of the fixed world. A torque exerted on this leg by the second arm part does not influence the rotational position of the first arm part with respect to the carrier.
  • the extension of the fixed world can only move in one degree of freedom, while the forces in the other five degrees of freedom are conducted to the fixed world.
  • a parallelogram is to be understood here as a mechanical construction with four legs, as well as equivalents thereof, such as gears or pulleys with a chain or (toothed) belt, constructions wherein the parallelogram function is electronically simulated.
  • the support or scale is clear at its lower side, to provide a maximum freedom of movement to a user.
  • the lower side can be kept clear for example by using a thin hinge as a second arm-part, to which the scale or support is connected.
  • a further contribution to the freedom of movement for the user may be obtained by the shape of the parallelogram of the first arm-part. When at least one of the four legs of the parallelogram is curved, the user has an increased freedom of movement for his or her upper arm.
  • At least one of the spring elements is configured for compensating the weight of the upper arm and/or fore arm respectively.
  • the support force is very close to the force caused by the weight of the upper arm and/or fore arm of the user. This gives the user the feeling that his or her arm floats, and no force needs to be applied by the user to keep his or her fore- or lower arm in a vertical position.
  • the compensation may further be adjusted for objects carried by the user, such as clothing, or a mug or forces to be exert by the user.
  • the weight-compensation by the first spring-element on the first arm-part is dependent on the rotational angle of the first arm-part with respect to the carrier, and/or the weight compensation on the second spring-element on the second arm-part is dependent on the rotational angle of the second arm-part with respect to the first arm-part.
  • the first and/or second spring-element may for instance be coupled to the carrier by means of a string or a band, which may be a metal string or band, or a rod or plastic or any other material that can handle forces.
  • the band or string may also fulfil this function itself, and may thereto be made of a material with preselected elastic properties.
  • the desired force exerted by the arm-part on the arm of the user is not necessarily be linearly dependent on the angle of rotation.
  • the string or band is led over an excentric conductor, for obtaining a disproportional stretch of the spring-element with respect to the rotation.
  • This excentric conductor according to the present invention is a specifically shaped piece. Its shape is the outcome of calculations that arrange the disproportional stretch as desired.
  • At least one spring-element may be tightenable. This can be done manually, but there may also be an actuator available for this purpose, which may be embodied with or without computer steering.
  • the string or band for exerting a force on the second arm-part may be led through the rotatable connection between the first and the second arm-part.
  • the rotatable connection can comprise an axially translatable beared rotation shaft, at both sides coupled to a section of the string or the band.
  • the sections of the string or the band are then arranged mutually rotatable about the axis of rotation.
  • an axially beared shaft of rotation comprises two parts that are in line, and that are mutually coaxially rotatable. A goal reached by of this rotable connection is to prevent for variations in length of the band.
  • rotational or pivotable movement of at least one arm part with respect to the carrier or the other arm part is lockable.
  • the connection between the first arm-part and the second arm-part about the elbow of the user can be locked to prevent unintended or uncontrolled sideward movement (in a horizontal plane), while balanced movement up and down (in a vertical plane) is enabled.
  • connection of the first arm-part to the carrier comprises a third arm part, to which the second arm-part is pivotably connected, and which is pivotably connected to the carrier.
  • connection of the first arm part which is located at the shoulder of a user, can be moved around within certain boundaries. This movement is desired since users move their shoulders in order to move their arms.
  • third arm-part hinged parts like an independent four-angle, in order to enable movement in a horizontal plane.
  • the arm support according to the present invention may offer rotational movement in a horizontal plane at the mutual connections of all arm supports and the carrier. Rotational movement within a vertical plane is balanced or compensated.
  • this object When the carrier of the arm support is coupled to a wheelchair or another movable object, this object may not always be level. This can result in an undesired movement of the arm support, in particular about the unbalanced axis of rotation.
  • an adjustable connection of the arm support to the carrier may thereto comprise at least three points of support, of which at least two have an adjustable height. This way, the arm support can be levelled within certain boundaries. In a preferred embodiment, all points of support have an adjustable height. This enables a height compensation or adjustment of the arm support.
  • the points of support may for example be embodied as telescopic pillars.
  • Figure 1 shows a perspective view of an arm support 1 according to the invention.
  • the device comprises a carrier 2 , connectable to or forming part of a user support, such as a (wheel) chair (not shown), a first arm-part 3, rotatably connected to the carrier 2, a second arm-part 4, rotatably connected to the first arm-part 3, comprising a support, such as a scale (not shown), for a fore arm of a user.
  • the arm support further comprises a first spring-element 5, for exerting a force on the first arm-part with respect to the carrier 2 for supporting a upper arm of the user, and a second spring-element 6, for exerting a force on the second arm-part 4 with respect to the carrier 2 for supporting a fore arm of the user.
  • the first arm-part 3 comprises a parallelogram, comprising members A, B, C and D.
  • the parallelogram enables an independent control of the forces exerted by the spring elements 5 and 6 on the first and second arm part respectively.
  • the second arm part 4 is very compact, and serves to carry a (not depicted) arm support, such as a scale (7, see figure 2 ). As visible in figures 1 and 2 , due to the very small dimensions of the second arm-part, the support or scale 7 is clear at its lower side, to provide a maximum freedom of movement to a user.
  • the spring elements 5 and 6 are configured for compensating the weight of the upper arm and/or fore arm respectively, wherein the weight-compensation by the first spring-element 5 on the first arm-part 3 is dependent on the rotational angle of the first arm-part 3 with respect to the carrier 2, and the weight compensation on the second spring-element 6 on the second arm-part 4 is dependent on the rotational angle of the second arm-part 4 with respect to the first arm-part 3. It may further be dependent on the carrier 2.
  • Figure 2 shows how the first and second spring-elements 5, 6 are coupled to the carrier 2 by means of metal bands 8, 9, that are led over specifically shaped conductors 10, 11, for obtaining a disproportional stretch of the spring-elements 5, 6 with respect to the rotation.
  • Conductors 10 and 11 are specifically shaped excentric with respect to the respective points of rotation of the first arm part 3 to the carrier, and the second arm part 4 to the first arm part 3, and/or with respect to the carrier.
  • Both spring elements 5 and 6 are tightenable, for adjusting a force on the weight of an arm of a user of the arm support. Tightening is performed by stretching the spring elements via their respective bands 8 and 9. Thereto, electrically controllable coils 12 and 13 are provided.
  • Figures 3 and 4 show the conductors 10 and 11 into more detail.
  • Figure 4 furthermore shows that the band 9 for exerting a force on the second arm-part is led through the rotatable connection 17, 18 between the first and the second arm-parts 3, 4.
  • the rotatable connection 17, 18 comprises an axially translatable (directions F) rotation shaft 14, consisting of mutually rotatable parts 15 and 16, which are each coupled to a section of the string or the band 9.
  • the second arm part 4 is rotated in a direction J around axis H (see figures 1 and 2 )
  • the sections of the band 9 are mutually rotated as well, and they can still be translated in a direction F along axis E, when the second arm part 4 is rotated over an angle G, in order to prevent a change of length of the string or band.
  • Figure 5 shows a further improvement of the freedom of movement of a user, obtained by the connection of the first arm-part 3 to the carrier 2 that now comprises a third arm part 19, to which the first arm-part is 3 pivotably connected, and which is pivotably connected to the carrier.
  • the connection of the first arm part 3, which is located at the shoulder of a user, can be moved around within certain boundaries.
  • this third arm-part 19 comprises an independent four-angle 20, in order to enable movement in a horizontal plane.
  • the arm support offers rotational movement in a horizontal plane at the mutual connections of all arm parts 19, 3, 4 and the carrier 2. Rotational movement within a vertical plane is balanced or compensated.
  • the arm support is provided with an adjustable connection of the arm support to the carrier.
  • This connection comprises three points 21, 22, 23 of support, which have an adjustable height K, that is adjustable by telescopic movement of the points of dupport 21, 22, 23, which are embodied as pillars.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Rehabilitation Tools (AREA)
  • Manipulator (AREA)
EP12183426.1A 2011-09-08 2012-09-07 Support de bras Not-in-force EP2567636B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2007373A NL2007373C2 (en) 2011-09-08 2011-09-08 Arm support.

Publications (2)

Publication Number Publication Date
EP2567636A1 true EP2567636A1 (fr) 2013-03-13
EP2567636B1 EP2567636B1 (fr) 2014-06-04

Family

ID=46796475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12183426.1A Not-in-force EP2567636B1 (fr) 2011-09-08 2012-09-07 Support de bras

Country Status (2)

Country Link
EP (1) EP2567636B1 (fr)
NL (1) NL2007373C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2629738C1 (ru) * 2016-03-16 2017-08-31 Александр Александрович Воробьёв Экзоскелет верхних конечностей
US9872565B2 (en) 2012-09-20 2018-01-23 Steelcase Inc. Chair arm assembly
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713591A (en) * 1995-09-29 1998-02-03 Zarkhin; Gregory Multiposition leg and foot, arm and hand supports for wheelchairs
US20030023195A1 (en) * 2001-07-30 2003-01-30 Tariq Rahman Orthosis device
US20080009771A1 (en) * 2006-03-29 2008-01-10 Joel Perry Exoskeleton
US20090149790A1 (en) * 2007-12-05 2009-06-11 Saebo, Inc. Orthotic device spanning elbow

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5713591A (en) * 1995-09-29 1998-02-03 Zarkhin; Gregory Multiposition leg and foot, arm and hand supports for wheelchairs
US20030023195A1 (en) * 2001-07-30 2003-01-30 Tariq Rahman Orthosis device
US6821259B2 (en) 2001-07-30 2004-11-23 The Nemours Foundation Orthosis device
US20080009771A1 (en) * 2006-03-29 2008-01-10 Joel Perry Exoskeleton
US20090149790A1 (en) * 2007-12-05 2009-06-11 Saebo, Inc. Orthotic device spanning elbow

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9872565B2 (en) 2012-09-20 2018-01-23 Steelcase Inc. Chair arm assembly
US10213019B2 (en) 2012-09-20 2019-02-26 Steelcase Inc. Chair arm assembly
US10835041B2 (en) 2012-09-20 2020-11-17 Steelcase Inc. Chair arm assembly
US11304528B2 (en) 2012-09-20 2022-04-19 Steelcase Inc. Chair assembly with upholstery covering
RU2629738C1 (ru) * 2016-03-16 2017-08-31 Александр Александрович Воробьёв Экзоскелет верхних конечностей

Also Published As

Publication number Publication date
NL2007373C2 (en) 2013-03-11
EP2567636B1 (fr) 2014-06-04

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