Device for supporting a back of a user

Abstract

The invention relates to an orthopedic device for supporting a back, especially a lower back, of a user, wherein the device comprises an upper body element 48, an upper leg element 4 and a first passive actuator 8, which is configured to apply a force to the upper leg element 4 and/or the upper body element 48 when an angle between the upper leg element 4 and the upper body element 48 is within a first predetermined angular range, wherein the device comprises at least a second passive actuator 10, which is configured to apply a force to the upper leg element 4 and/or the upper body element 48 when the angle is within a predetermined second angular range that is different to the first angular range.

Claims

1. An orthopedic device for supporting a back, especially a lower back, of a user, wherein the orthopedic device comprises an upper body element; an upper leg element; a first passive actuator which is configured to apply a force to the upper leg element and/or the upper body element when an angle between the upper leg element and the upper body element is within a first predetermined angular range; at least a second passive actuator which is configured to apply a force to the upper leg element and/or the upper body element when the angle is within a predetermined second angular range that is different to the first angular range.

2. The orthopedic device according to claim 1, wherein the first angular range and the second angular range overlap.

3. The orthopedic device according to claim 1, wherein the first passive actuator and/or the second passive actuator comprise(s) at least one mechanical energy store.

4. The orthopedic device according to claim 3, wherein the at least one mechanical energy store comprises elastic elements, wherein the elastic elements of the first passive actuator and the second passive actuator exhibit different elasticities.

5. The orthopedic device according to claim 1, wherein the first passive actuator and/or the second passive actuator are arranged at at least one point of application on the upper leg element and/or the upper body element that is adjustable.

6. The orthopedic device according to claim 1, wherein the first passive actuator and/or the second passive actuator are arranged at different points of application on the upper leg element and/or the upper body element and/or have different lengths.

7. The orthopedic device according to claim 3, wherein the upper body element comprises a first force transmission element and the upper leg element comprises a second force transmission element, wherein the first mechanical energy store and the second mechanical energy store are chargeable and dischargeable by swivelling the upper leg element relative to the upper body element when the first force transmission element is engaged with the second force transmission element.

8. The orthopedic device according to the claim 7, further comprising a pelvic element and wherein the upper body element is arranged such that it can be moved relative to the pelvic element, wherein the first force transmission element is engageable and disengageable with the second force transmission element by moving the upper body element relative to the pelvic element.

9. The orthopedic device according to claim 1, wherein the first passive actuator and the second passive actuator are each arranged at a force application point on a force application lever.

10. The orthopedic device according to the claim 9, wherein an orientation and/or position of the two force application levers in relation to one another and/or at least one of the two force application points are adjustable.

11. The orthopedic device according to claim 1, wherein a preload of the first actuator and/or a preload of the second actuator is adjustable.

12. The orthopedic device according to claim 1, wherein the pattern of the force applied by the first actuator and/or the force applied by the second actuator extends depends on the angle.

13. The orthopedic device according to claim 12, wherein the force exerted by the first actuator and the force exerted by the second actuator exhibit a maximum at different angles.

14. The orthopedic device according to claim 1, wherein for angles smaller than the respective predetermined angular, the force exerted by the respective actuator is zero or essentially zero.

15. The orthopedic device according to claim 3, wherein the at least one mechanical energy store is at least one elastic element.

16. The orthopedic device according to claim 3, wherein the at least one mechanical energy store is at least one tension spring and/or at least one damper.

17. The orthopedic device according to claim 4, wherein the elastic elements of the first passive actuator and the second passive actuator exhibit different spring constants and/or different degrees of damping.

18. The orthopedic device according to claim 10, wherein the orientation and/or position of the two force application levers in relation to both force application points are adjustable.

19. The orthopedic device according to claim 12, wherein the pattern is curved.

20. The orthopedic device according to claim 12, wherein the pattern is sinusoidal.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0084] The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawings will be provided by the Office upon request and payment of the necessary fee.

[0085] In the following, examples of embodiments of the present invention will be explained in more detail by way of the attached figures: They show

[0086] FIGS. 1 and 3—a schematic side view and rear view of a part of a device according to a first example of an embodiment of the present invention,

[0087] FIGS. 2 and 4—enlarged representations of parts of FIGS. 1 and 3,

[0088] FIGS. 5 to 7—a device according to an example of an embodiment of the present invention in the mounted state,

[0089] FIG. 8 the schematic depiction of different force patterns as a function of the angle between upper leg element and upper body element.

[0090] FIG. 1 depicts a side view of a part of a device according to a first example of an embodiment of the present invention. The device features a pelvic element 2, an upper leg element 4 and a mechanical energy store 6. The mechanical energy store 6 comprises a first passive actuator 8 and a second passive actuator 10, which can be connected to the pelvic element 2 via two force application levers 12 such that they are torque-proof. A rail element 14 is positioned on the pelvic element 2, wherein the first end 16 of said rail element is arranged on the pelvic element 2 such that it can be swivelled about a first swivel axis 18. In the example of an embodiment shown, the first swivel axis 18 extends perpendicular to the drawing plane. A second end 20 is arranged on an upper body element, not depicted, such that it can be swivelled about a second swivel axis 22. The length of the rail element 14 can be adjusted via an adjustment device 24, which is designed as a clamping device in the example of an embodiment shown. To this end, in the example of an embodiment shown, two sections 26 are displaced against each other as soon as the adjustment device 24 has been released. The adjustment device is subsequently re-locked and the rail element 14 used in the amended length.

[0091] FIG. 2 shows an enlarged section from FIG. 1. The upper leg element 4 comprises a leg shell 28 that is arranged on a spacer element 30. A joint arrangement 32 allows the upper leg element 4 to be swivelled relative to the pelvic element 2. The joint arrangement 32 can preferably be brought into a passive position and an active position. In the passive position, the force application levers 12 can be moved relative to the rest of the pelvic element 2. If, in this state, the upper leg element 4 is moved relative to the pelvic element 2, a force is applied to the force application levers 12 via the first passive actuator 8 and the second passive actuator 10 which ensures that the force application levers 12 are swivelled with the upper leg element 4. When the joint arrangement 32 is in the active state, the force application levers 12 are connected to the pelvic element 2 such that they are torque-proof. It is therefore not possible to swivel the force application levers 12 with the upper leg element 4 when it is moved relative to the pelvic element 2. The passive actuators 8, 10 are thus tensioned. Due to the different force application levers 12 and the different length of the two passive actuators 8, 10, the actuators contain different forces at different angular positions.

[0092] FIG. 3 depicts a rear view of the device from FIG. 1. The upper leg element 4 with the first passive actuator 8 and the second passive actuator 10, the joint arrangement 32 and the rail element 14 are all clearly recognizable. The rail element 14 features two partial rails 34 which are connected to a third swivel axis 38 via a joint 36.

[0093] FIG. 4 shows an enlarged section from FIG. 3. The leg shell 28 is positioned on the spacer element 30 via a positioning device 40 such that it can be swivelled in at least one direction, so that the optimal position of the leg shell 28 relative to the user's upper leg can be selected. In the example of the embodiment shown, the joint arrangement 32 is in the passive position. A first force transmission element 42 and a second force transmission element 44 can be recognized, which are not engaged with one another in the position shown. The force application levers 12 are thus not connected to the pelvic element 2 in a torque-proof manner.

[0094] FIGS. 5 to 7 show a device in the mounted state. FIG. 5 depicts a side view of the user. The upper leg element 4, the pelvic element 2 and particularly the rail elements 14 can be recognized. At the second end 20, the rail elements are arranged on the upper body element 48 via a ball joint 46.

[0095] FIG. 6 shows a rear view of the device in the mounted state. The two rail elements 14 extend from their second end 20, starting from the upper body element 48, to the pelvic element 2, where the first end 16 is arranged. It shows that the second ends 20 are arranged dorsally, i.e. on the back, on the upper body element 48, while the first ends 16 are arranged laterally, i.e. at the side, on the pelvic element 2.

[0096] FIG. 7 depicts the situation with a spinal column that is inclined to the right. The upper body element 48 moves slightly relative to the upper body, which is enabled by the two straps 50, which can also be described as shoulder straps. At the same time, the rail elements 14 swivel relative to the pelvic element 2, thereby enabling considerable freedom of movement. Both the upper body element 48 and the pelvic element 2, which includes a pelvic harness 52, are adjustable in length and can therefore be used for different people.

[0097] FIG. 8 depicts various force patterns, which can be interpreted as torque patterns, of the force exerted by the first actuator 8 and the second actuator 10 as a function of the angle between the upper leg element 4 and the upper body element 48. The solid line 54 does not start at the origin of the coordinate system. Consequently, the force applied is not equal to 0, even outside the first predetermined angular range, provided the angle is greater than the predetermined angular range. For example, the angle is greater when the person is standing upright. In the example of an embodiment shown, the first passive actuator 8 is therefore preloaded and exerts a force. This forces increases as the bending angle increases, i.e. as the angle between the upper leg element 4 and the upper body element 48 decreases, until it reaches a first maximum. If the bending continues, i.e. the angle decreases further, the force reduces again until the force begins to increase again at point P. The predetermined second angular range, in which the second passive actuator 10 exerts its force, begins in this range. This initially increases until the solid line 54 reaches its global maximum. At this bending angle, both the first passive actuator 8 and the second passive actuator 10 generate a force. These forces decrease upon further bending until no more force is exerted at the end.

[0098] The dashed curve 56 depicts a similar situation. In contrast to the solid line 54, the angle between the two force application levers 12 has been reduced. This is achieved, for example, by displacing the force application lever 12 in FIGS. 1 and 2, with which the second passive actuator 10 engages, anti-clockwise relative to the second force application lever 12, with which the first passive actuator 8 engages. It is clear that the point P has been displaced to the left. Consequently, the second passive actuator 10 already develops its force at smaller bending angles, i.e. greater angles between the upper leg element 4 and the upper body element 48.

[0099] The dash-dot line 58 shows another situation. In comparison to the solid line 54, the position of the two force application levers 12 relative to one another has not been changed. Rather, both force application levers 12 have been extended, causing an increase in the force exerted by the first passive actuator 8 and the second passive actuator 10 because the lever arm extends.

[0100] The dash-dot-dot line 60 shows the situation in which both the first passive actuator 8 and the second passive actuator 10 exert their force across the entire range.

[0101] The dotted line 62 corresponds to the parallel displaced solid line 54. The first passive actuator 8 is thus used without preloading.

REFERENCE LIST

[0102] 2 pelvic element [0103] 4 upper leg element [0104] 6 mechanical energy store [0105] 8 first passive actuator [0106] 10 second passive actuator [0107] 12 force application lever [0108] 14 rail element [0109] 16 first end [0110] 18 first swivel axis [0111] 20 second end [0112] 22 second swivel axis [0113] 24 adjustment device [0114] 26 section [0115] 28 leg shell [0116] 30 spacer element [0117] 32 joint arrangement [0118] 34 partial rail [0119] 36 joint [0120] 38 third swivel axis [0121] 40 positioning device [0122] 42 first force transmission element [0123] 44 second force transmission element [0124] 46 ball joint [0125] 48 upper body element [0126] 50 strap [0127] 52 pelvic harness [0128] 54 solid line [0129] 56 dashed curve [0130] 58 dash-dot line [0131] 60 dash-dot-dot line [0132] 62 dotted line