Strut attachments for external fixation frame
Disclosed herein are strut attachments for external fixation frames. The strut attachments provide solutions for frame configurations in which it is not possible to attach a strut at its ends to corresponding rings. The strut attachments may be considered an outrigger type of mechanism that achieves more travel out of completely collapsed struts. The strut attachments, each having a pivot and a hinge joint, allow a strut to be attached on the level of a first ring and extend at least partially proximally or distally to a second ring depending on the frame of reference of the ring system. These strut attachments may be used when the fully collapsed length of the strut will not allow the rings to get any closer to one another than is needed or proscribed. In such cases, the strut attachments allow for even tighter ring to ring distance.
1. A method of assembling an external fixation frame, comprising:
coupling a first strut attachment member to a first ring of the external fixation frame, the first strut attachment member coupled to a first end of an adjustable length strut;
coupling a first portion of a second strut attachment member to an second ring of the external fixation frame, a third portion of the second strut attachment member being secured between the first portion and a second portion of the second strut attachment member, the third portion defining a longitudinal axis, the adjustable length strut slidably received in the second portion at an angle transverse to the longitudinal axis;
changing a length of the adjustable length strut; and
after the length of the adjustable length strut is changed to a maximum length, sliding the second portion along the adjustable length strut from a first position to a second position.
2. The method of claim 1 , wherein coupling the first portion to the second ring includes inserting a fastener through an aperture defined by the first portion to couple the second strut attachment member to the first ring.
3. The method of claim 1 , wherein changing the length of the adjustable length strut includes translating a second end of the adjustable length strut away from the first end.
4. The method of claim 3 , wherein translating the second end away from the first end includes rotating an actuation mechanism of the adjustable length strut.
5. The method of claim 1 , further comprising, after the length of the adjustable length strut is changed to the maximum length, securing a device to the first ring and the second ring to maintain a distance between the first ring and the second ring.
6. The method of claim 1 , further comprising rotating a pin received in the second position prior to sliding the second portion.
7. The method of claim 6 , further comprising removing the pin from a first feature defined by the adjustable length strut prior to sliding the second portion.
8. The method of claim 1 , further comprising securing the second portion to the adjustable length strut by securing the pin to a second feature defined by the adjustable length strut after sliding the second portion.
9. The method of claim 1 , further comprising rotating the first portion about an extension extending from the third portion along the longitudinal axis.
10. The method of claim 9 , wherein the first portion is translationally fixed to the extension through a recess defined by the extension.
11. The method of claim 1 , further comprising rotating the second portion about a pivot pin received through the second portion and the third portion.
12. The method of claim 11 , wherein rotating the second portion includes rotating the second portion transverse to the longitudinal axis.