Movable joint having up to six degrees of freedom
A movable joint ( 100 ) including: a body ( 102 ) having two spaced apertures ( 104, 106 ) connected by an opening ( 108 ); two arms ( 110, 112 ) having ends receivable in the apertures; and a resilient connector ( 114 ) passing though the opening ( 108 ) to connect the ends of the arms in the apertures, wherein the resilience of the resilient connector: allows independent movement of the arms in up to six degrees of freedom which is controlled by engagement of abutment portions ( 120 ) of the arms ( 110, 112 ) with respective abutment portions ( 122 ) of the apertures ( 104, 106 ); and absorbs force applied to the arms.
1. A movable joint comprising:
a body having two spaced apertures connected by an opening;
two arms having ends receivable in the apertures; and
a resilient connector, having a resilience, passing through the opening to connect the ends of the arms in the apertures, wherein the resilience of the resilient connector:
allows independent movement of the arms in up to six degrees of freedom which is controlled by engagement of abutment portions of the arms with respective abutment portions of the apertures, and
absorbs forces applied to the arms.
2. A movable joint according to claim 1 , wherein the independent movement of the arms in up to six degrees of freedom is controlled by selection of one or a combination of: a three-dimensional shape of the abutment portions of the arms, a three-dimensional shape of the abutment portions of the apertures, and by selection of the resilience characteristics of the resilient connector.
3. A movable joint according to claim 2 , wherein the independent movement of the arms in up to six degrees of freedom is controlled of substantially simulating-anatomical movement of a human or animal joint in up to six degrees of freedom.
4. A movable joint according to claim 1 , wherein the resilient connector is pretensioned to resist tensile loads applied to the arms.
5. A movable joint according to claim 4 , wherein the resilient connector includes a pretensioned element provided inside a resilient member.
6. A movable joint according to claim 1 , wherein the resilient connector releasably connects the ends of the arms in the apertures.
7. A movable joint system according to claim 1 , in combination with a joint support device for a human or animal joint, the joint support device including two support portions connected for relative movement about the human or animal joint by at least one movable joint.
8. A movable joint system according to claim 7 , wherein the joint support device is a human knee brace and the two support portions are upper and lower leg portions.
9. A movable joint system according to claim 7 , wherein the joint support device is a human ankle brace and the two support portions are a lower leg portion and a foot portion.
10. A movable joint system according to claim 1 , in combination with a joint support device for a human or animal joint, the joint support device including two support portions connected for relative movement about the human or animal joint.
11. A movable joint system according to claim 10 , wherein the joint support device is a human knee brace and the two support portions are upper and lower leg portions.
12. A movable joint system according to claim 10 , wherein the joint support device is a human ankle brace and the two support portions are a lower leg portion and a foot portion.
13. A movable joint system comprising:
a plurality of bodies each having two spaced apertures connected by an opening;
two arms having ends receivable in the apertures; and
a resilient connector, having a resilience, passing through the opening to releasably connect the ends of the arms in the apertures, wherein the resilience of the resilient connector:
allows independent movement of the arms in up to six degrees of freedom which is controlled by engagement of abutment portions of the arms with respective abutment portions of the apertures; and
absorbs forces applied to the arms;
wherein the abutment portions of the apertures of each body are differently shaped to the abutment portions of the apertures of other bodies, whereby the independent movement of the arms in up to six degrees of freedom is selectively controllable by interchanging the bodies.
14. A movable joint comprising:
a single unitary body;
two spaced apertures in the body;
an opening inside the body interconnecting the two apertures;
two arms each having one end movably received in one of the two apertures; and
an elongate resilient connector extending through the opening with opposite ends interconnecting the one ends of the two arms.
15. A movable joint according to claim 14 , wherein the body is made of plastic.
16. A movable joint according to claim 14 , wherein the resilient connector comprises a pretensioned fibre spine overmoulded by a resilient plastic member.
17. A movable joint according to claim 14 , wherein the resilient connector has a selected resilience that, in use, influences relative movement of the two arms.
18. A knee brace comprising two movable joints according to claim 14 .
19. An ankle brace comprising two movable joints according to claim 14 .