WO2006080877A1 - Device for artificial joint - Google Patents

Device for artificial joint Download PDF

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Publication number
WO2006080877A1
WO2006080877A1 PCT/SE2006/000068 SE2006000068W WO2006080877A1 WO 2006080877 A1 WO2006080877 A1 WO 2006080877A1 SE 2006000068 W SE2006000068 W SE 2006000068W WO 2006080877 A1 WO2006080877 A1 WO 2006080877A1
Authority
WO
WIPO (PCT)
Prior art keywords
orthosis
wire
joint
lever
locking mechanism
Prior art date
Application number
PCT/SE2006/000068
Other languages
French (fr)
Inventor
Michael Ceder
Ola BJÖRK
Fredrik Lans
Original Assignee
Team Ortopedteknik Scandinavia Ab
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 Team Ortopedteknik Scandinavia Ab filed Critical Team Ortopedteknik Scandinavia Ab
Publication of WO2006080877A1 publication Critical patent/WO2006080877A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/0102—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations
    • A61F5/0123—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations for the knees
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/0102—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations
    • A61F2005/0132—Additional features of the articulation
    • A61F2005/0158—Additional features of the articulation with locking means
    • A61F2005/0162—Additional features of the articulation with locking means when weight is applied
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/0102—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations
    • A61F2005/0132—Additional features of the articulation
    • A61F2005/0169—Additional features of the articulation with damping means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F5/00—Orthopaedic methods or devices for non-surgical treatment of bones or joints; Nursing devices; Anti-rape devices
    • A61F5/01—Orthopaedic devices, e.g. splints, casts or braces
    • A61F5/0102—Orthopaedic devices, e.g. splints, casts or braces specially adapted for correcting deformities of the limbs or for supporting them; Ortheses, e.g. with articulations
    • A61F2005/0132—Additional features of the articulation
    • A61F2005/0179—Additional features of the articulation with spring means

Definitions

  • the proposed invention relates to a device for artificial joints, in particular a knee joint orthosis.
  • the aim of the above invention is to create a device for artificial joints, specifically knee joint orthoses, to stop undesired angle changes in the joint by locking against continued movement and with a particular weight on the user's heel.
  • the joint is automatically unlocked when the pressure is reduced.
  • the device can be built in at production, or fixed on an existing orthosis.
  • the function of the locking mechanism is to control the locking and unlocking of the device with the help of the mechanical signal from the footplate.
  • the mechanism consists of a spring that allows the wire in tension over the knee to be pulled down.
  • a gas spring is an example of such a spring in the following text.
  • This also includes a function that locks the movement of the spring by a button in the upper end of the piston rod.
  • the button is affected by a hinge which has the wire from the footplate fixed inside.
  • the hinge can rotate around a shaft, which is situated for optimum transmission of the movement of the wire.
  • the hinge is also affected by a spring that works in the opposite direction to the wire.
  • the movement of the hinge is affected by a regulating plate, which can be set in one of three positions using a button on the shaft journal, easily accessible from the outside. This in turn affects the regulating plate and moves it to the desired position.
  • FIG 1 shows the principle of the invention
  • Figure 2 shows a sectional diagram of a locking mechanism for the invention
  • Figure 3 shows the locking mechanism with corresponding footplate Figures 4-6 show the three different function positions for the mechanism
  • Figure 10 shows a knee joint lever
  • Figure 11 is a side view of the locking mechanism
  • Figures 2-10 show the device in cross-section. Non-essential details regarding the function of the device have been omitted.
  • Figure 1 shows a schematic diagram of a person's foot (30), lower leg (28) and thighbone (27) connected to a knee joint (29).
  • An orthosis is fitted above and below the knee joint.
  • On the lower leg section of the orthosis is a fixed joint lever (25).
  • a wire (26) runs from the lever or from the lower leg via the lever up to an upper bracket on the thighbone. This bracket is positioned to give flexible, lockable movement when the leg and the orthosis bend at the knee joint. The joint will lock at an angle where weight is placed on the user's heel, and will prevent any further bending.
  • the joint lever (25) is shown in more detail in Figure 10. It is designed with a sufficiently large radius so as to minimise wear and tear, and to avoid damaging the wire that runs in the wire groove (27) and through the hole (28) under which the line is fixed.
  • the lever is fixed in the lower section of the orthosis and follows the movement of the lower leg, and as the leg bends at the knee, the wire is pulled down. When the wire is locked and cannot be pulled down, this means that the knee cannot bend any further.
  • the locking mechanism includes a gas spring (6), which is fixed on the upper part of the orthosis.
  • a gas spring's piston rod (13) On the outer, upper side of the gas spring's piston rod (13) is a fixed housing, or block (1).
  • a button (12) At the top of the piston rod (13) is a button (12). The piston rod locks with this button so it cannot be shifted in the gas spring.
  • One side of the block (1) that faces away from the leg is covered by a lid (9) with a groove (15).
  • the locking mechanism can be set in one of three positions by shifting a regulating plate (4) in the mechanism, which is affected by a shaft journal (16) which is adjustable in the groove (15).
  • a lever or knob (10) is fitted to the shaft journal (16) for ease of use.
  • the upper end of the wire is fixed to a lever (7) included in the locking mechanism.
  • the lever rotates on a shaft (3) on the fixed block, and is partly affected by the wire and partly by a spring (2) which presses on the lever via a shaft (8).
  • the shaft (3) is situated so that a movement of lmm in the wire produces a 2mm movement in the end of the lever that affects the button (12).
  • the wire casing is fixed on the block with a connective sleeve (5).
  • the movement of the lever is dependent on the position of the regulating plate (4) (these positions 1-3 are shown in Figures 4-6).
  • the position in Figure 4 is unlocked, meaning that the lever is blocked so that the gas spring cannot be locked.
  • the regulating plate is situated far left, as indicated in the diagram.
  • Figure 6 The position in Figure 6 is locked, meaning that the lever is blocked so that the gas spring is locked. In this position, the orthosis joint is locked against further bending of the knee joint, as the wire (26) cannot be pulled down.
  • Figures 7 and 9 show the position of the footplate as unlocked and locked, respectively.
  • Figures 5 and 8 show the locking mechanism and the footplate in the automatic position, and in a situation where the footplate is not bearing any weight from the user. When the footplate is bearing weight from movement transmitted by the wire, the lever (7) can therefore move from Figure 5 to the position indicated in Figure 6, where the button (12) on the gas spring's piston rod is triggered so the gas spring locks.

Landscapes

  • Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Abstract

This invention concerns a device for artificial joints for a joint orthosis with an upper and lower part comprising a wire (26) that is connected between the upper and lower parts of the orthosis, from or via a lever (25) on the lower part, up to an upper bracket on the upper part of the orthosis. The upper bracket provides a flexible, lockable movement when the orthosis bends in the joint. Locking occurs at an angle during stepping when the user's weight is placed on a device (20, 21) connected to the locking mechanism, meaning that there is no further bending of the joint until the weight on said device is removed. Specifically, the spring mechanism must be a gas spring. A locking mechanism is fixed on the gas spring's piston rod.

Description

Device for artificial joint
The proposed invention relates to a device for artificial joints, in particular a knee joint orthosis.
The orthosis is to be used as a complement to existing parts of the body with insufficient movement, but not to entirely replace these parts. An example of an orthosis is a knee joint orthosis that is fixed onto a person's leg with one part of the device above the knee, and one part below the knee; with the two parts connected together with a type of hinged joint. When the person using this device is walking, the orthosis should stop the knee bending too far, ideally when the heel is placed on the ground and bears the user's body weight. The device should also unlock when the pressure is removed or falls below a certain level.
The aim of the above invention is to create a device for artificial joints, specifically knee joint orthoses, to stop undesired angle changes in the joint by locking against continued movement and with a particular weight on the user's heel. The joint is automatically unlocked when the pressure is reduced. The device can be built in at production, or fixed on an existing orthosis. i
This device, as proposed, comprises a wire or equivalent, stretching between the two parts of the orthosis or its fixtures. The wire is permanently under tension and is pulled down when the knee is bent, and the device locks the orthosis against further bending, by stopping the wire being pulled further down. The pressure conditions will thus prevent movement in the other direction. In order to achieve suitable movement, the wire is positioned by or through a lever on the lower part of the orthosis, while the locking device is fixed on the upper part. The lever is used to control the wire around the knee joint, to take up the momentum from the anatomical knee joint and reduce the transferred traction in the wire. The orthosis is locked by the locking device which is affected by a device affected by the heel on which it is placed. The locking device has different function settings - automatic, unlocked, and locked. The functions of each setting are described in the following section. The force affecting the locking device is transmitted via a footplate, consisting of two layers that are connected by a hinge. The lower layer works as resistance against the sole of the shoe, and also comprises a holder for the wire that transfers movement to the upper part of the footplate to the locking device. This means that the body weight on the user's heel is transferred to the control mechanism in the locking device.
The function of the locking mechanism is to control the locking and unlocking of the device with the help of the mechanical signal from the footplate. The mechanism consists of a spring that allows the wire in tension over the knee to be pulled down. A gas spring is an example of such a spring in the following text. This also includes a function that locks the movement of the spring by a button in the upper end of the piston rod. The button is affected by a hinge which has the wire from the footplate fixed inside. The hinge can rotate around a shaft, which is situated for optimum transmission of the movement of the wire. The hinge is also affected by a spring that works in the opposite direction to the wire.
The movement of the hinge is affected by a regulating plate, which can be set in one of three positions using a button on the shaft journal, easily accessible from the outside. This in turn affects the regulating plate and moves it to the desired position.
This invention is characterised by the features evident in patent claim 1. Design models of the invention are characterised by the further features evident in the other patent claims.
The invention is described in more detail below, with reference to the example of a preferred design, as indicated by the enclosed drawings.
Figure 1 shows the principle of the invention
Figure 2 shows a sectional diagram of a locking mechanism for the invention
Figure 3 shows the locking mechanism with corresponding footplate Figures 4-6 show the three different function positions for the mechanism
Figures 7-9 show the corresponding positions for the footplate
Figure 10 shows a knee joint lever
Figure 11 is a side view of the locking mechanism
Figures 2-10 show the device in cross-section. Non-essential details regarding the function of the device have been omitted.
Figure 1 shows a schematic diagram of a person's foot (30), lower leg (28) and thighbone (27) connected to a knee joint (29). An orthosis is fitted above and below the knee joint. On the lower leg section of the orthosis is a fixed joint lever (25). A wire (26) runs from the lever or from the lower leg via the lever up to an upper bracket on the thighbone. This bracket is positioned to give flexible, lockable movement when the leg and the orthosis bend at the knee joint. The joint will lock at an angle where weight is placed on the user's heel, and will prevent any further bending.
The joint lever (25) is shown in more detail in Figure 10. It is designed with a sufficiently large radius so as to minimise wear and tear, and to avoid damaging the wire that runs in the wire groove (27) and through the hole (28) under which the line is fixed. The lever is fixed in the lower section of the orthosis and follows the movement of the lower leg, and as the leg bends at the knee, the wire is pulled down. When the wire is locked and cannot be pulled down, this means that the knee cannot bend any further.
The locking of the wire comprises a footplate and a locking mechanism. The footplate is placed in the user's shoe and the locking mechanism is positioned on the upper section of the orthosis; and a wire joins the footplate and locking mechanism. The footplate has an underside (20) and an upper side (21) that are flexible in relation to each other through the hinge joint (22). The wire between the locking mechanism and the footplate is connected to the upper side of the footplate and the wire cover is attached with its connecting sleeve to a bracket (23) on the underside of the footplate. In the starting position, an upwards-directed force from a spring in the locking mechanism acts on the wire and the upper side of the footplate is then in its uppermost position, creating a shallow angle with the underside of the footplate. When the user of the orthosis puts his foot down, the heel presses down on the upper side of the footplate and the wire is also pulled down. In this respect, the locking mechanism functions so that the wire's (26) upper end is locked, and the knee cannot bend any further.
In the design shown in the drawings, the locking mechanism includes a gas spring (6), which is fixed on the upper part of the orthosis. On the outer, upper side of the gas spring's piston rod (13) is a fixed housing, or block (1). At the top of the piston rod (13) is a button (12). The piston rod locks with this button so it cannot be shifted in the gas spring. One side of the block (1) that faces away from the leg is covered by a lid (9) with a groove (15). The locking mechanism can be set in one of three positions by shifting a regulating plate (4) in the mechanism, which is affected by a shaft journal (16) which is adjustable in the groove (15). A lever or knob (10) is fitted to the shaft journal (16) for ease of use.
The upper end of the wire is fixed to a lever (7) included in the locking mechanism. The lever rotates on a shaft (3) on the fixed block, and is partly affected by the wire and partly by a spring (2) which presses on the lever via a shaft (8). The shaft (3) is situated so that a movement of lmm in the wire produces a 2mm movement in the end of the lever that affects the button (12). The wire casing is fixed on the block with a connective sleeve (5). The movement of the lever is dependent on the position of the regulating plate (4) (these positions 1-3 are shown in Figures 4-6). The position in Figure 4 is unlocked, meaning that the lever is blocked so that the gas spring cannot be locked. The regulating plate is situated far left, as indicated in the diagram. The position in Figure 6 is locked, meaning that the lever is blocked so that the gas spring is locked. In this position, the orthosis joint is locked against further bending of the knee joint, as the wire (26) cannot be pulled down. Figures 7 and 9 show the position of the footplate as unlocked and locked, respectively. Figures 5 and 8 show the locking mechanism and the footplate in the automatic position, and in a situation where the footplate is not bearing any weight from the user. When the footplate is bearing weight from movement transmitted by the wire, the lever (7) can therefore move from Figure 5 to the position indicated in Figure 6, where the button (12) on the gas spring's piston rod is triggered so the gas spring locks.
Within the framework of this invention, the various components can be replaced in different ways. The gas spring, for example, can be replaced by a hydraulic cylinder, whereby the construction can be adapted so that the spring can exert lift rather than pressure (such as the gas spring in the above example).
List of components:
1. Block
2. Compression spring 3. Shaft
4. Regulating plate
5. Connective sleeve for wire
6. Gas spring
7. Lever 8. Shaft
9. Lid
10. Knob
11. Wire groove
12. Button 13. Piston rod
14. Groove
15. Groove
16. Journal
17. Hole (for journal) 18. Hole (for shaft)
19. Hole (for sleeve)
20. Lower part of footplate
21. Upper part of footplate
22. Hinge joint 23. Bracket
24. Sleeve
25. Joint lever
26. Wire
27. Wire groove 28. Hole

Claims

PATENT CLAIMS
1. Device for artificial joints for a joint orthosis with an upper and lower part, characterised in that it comprises a wire (26) that is connected between the upper and lower parts of the orthosis, from or via a lever (25) on the lower part, up to an upper bracket on the upper part of the orthosis. The upper bracket provides a flexible, lockable movement when the orthosis bends in the joint. Locking occurs during stepping, at an angle when the user's weight is placed on a locking mechanism device (20, 21), meaning that there is no further bending of the joint until the weight on said device is removed.
2. Device according to patent claim 1 , characterised in that the spring mechanism is a gas spring.
3. Device according to patent claim 2, characterised in that a locking mechanism is fixed onto the gas spring's piston rod.
PCT/SE2006/000068 2005-01-27 2006-01-18 Device for artificial joint WO2006080877A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0500223A SE0500223L (en) 2005-01-27 2005-01-27 Artificial joint device
SE0500223-3 2005-01-27

Publications (1)

Publication Number Publication Date
WO2006080877A1 true WO2006080877A1 (en) 2006-08-03

Family

ID=35745137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/000068 WO2006080877A1 (en) 2005-01-27 2006-01-18 Device for artificial joint

Country Status (2)

Country Link
SE (1) SE0500223L (en)
WO (1) WO2006080877A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943622A (en) * 1959-10-05 1960-07-05 Kurt B Nelson Leg brace orthopedic appliance
US5490831A (en) * 1994-05-25 1996-02-13 The United States Of America As Represented By The Administrator, National Aeronautics And Space Administration Selectively lockable knee brace
EP1186279A1 (en) * 2000-09-07 2002-03-13 Ferdinand Hauber GmbH & Co. KG Hinged orthopaedic brace having motion induced unlocking
US20020169402A1 (en) * 2001-05-14 2002-11-14 Hatton Bobby Joe Articulating knee supports

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2943622A (en) * 1959-10-05 1960-07-05 Kurt B Nelson Leg brace orthopedic appliance
US5490831A (en) * 1994-05-25 1996-02-13 The United States Of America As Represented By The Administrator, National Aeronautics And Space Administration Selectively lockable knee brace
EP1186279A1 (en) * 2000-09-07 2002-03-13 Ferdinand Hauber GmbH & Co. KG Hinged orthopaedic brace having motion induced unlocking
US20020169402A1 (en) * 2001-05-14 2002-11-14 Hatton Bobby Joe Articulating knee supports

Also Published As

Publication number Publication date
SE527288C2 (en) 2006-02-07
SE0500223L (en) 2006-02-07

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