Interspinous process distraction device
An interspinous process distraction device includes a male distraction element and a female distraction element, which both have a clamping portion for fixedly pushing and rejecting the interspinous processes and also respectively have a first connecting portion and a second connecting portion connected at the other end of the clamping portion. Here, the first connecting portion and the second connecting portion are paired for blocking with each other so as to form the interspinous process distraction device capable of having an opposite rotation. Besides, through clamping two interspinous processes which stress the nerve by the male distraction element and the female distraction element and rotating them to oppositely rotate, the two interspinous processes can therefore be moved to be in alignment as the normal condition.
1. An interspinous process distraction device for clamping and distracting an interspinous process and releasing a stressed nerve, comprising:
a male distraction element having at least one first clamping portion receiving an interspinous process and a first connecting portion, wherein the first clamping portion and the first connecting portion are respectively connected at two ends of the male distraction element; and
a female distraction element having a second clamping portion receiving an interspinous process and a second connecting portion, wherein the second clamping portion and the second connecting portion are respectively located at two ends of the female distraction element, and the second connecting portion is paired and mutually blocked with the first connecting portion and has a rotation space about an axis so that the male distraction device and the female distraction device own an opposite rotation function;
said axis extending perpendicular to a plane in which the first clamping portion lies;
wherein the first clamping portion of the male distraction element and the second clamping portion of the female distraction element respectively have a trough structure into each of which an interspinous process extends so as to clamp the interspinous process on the spine; and
wherein the first clamping portion of the male distraction element and the second clamping portion of the female distraction element have an included angle of 180°, so as to fix the interspinous processes in alignment.
2. The interspinous process distraction device as claimed in claim 1 , wherein the first connecting portion of the male distraction element has an axle center extended therefrom and a first wedging element and a second wedging element mounted on the axle center.
3. The interspinous process distraction device as claimed in claim 2 , wherein the second connecting portion of the female distraction element has an axle space formed by a surrounding wall for being sleeved on the first connection portion, and has a limiting notch mounted on the wall for restricting the first wedging element, so that a rotation between the male distraction element and the female distraction element has a limited range.
4. The interspinous process distraction device as claimed in claim 3 , wherein the second wedging element is locked at the edge of the wall surrounding the axle space.
5. The interspinous process distraction device as claimed in claim 1 , further comprising a latch element for connecting and rotating the first connecting portion and the second connecting portion.
6. The interspinous process distraction device as claimed in claim 5 , wherein the latch element is a pillar for fixedly connecting the first connecting portion with the second connecting portion and has two planes respectively at the top and the bottom, as in a horizontal state, of the middle section thereof.
7. The interspinous process distraction device as claimed in claim 1 , wherein the first clamping portion of the male distraction element is separated into two levels which are connected together by the first connecting portion to form a “U” shape, and the first connecting portion is a pillar connected between the first clamping portion.
8. The interspinous process distraction device as claimed in claim 7 , wherein the second connecting portion of the female distraction element is an inward trough capable of being blocked with the trough structure of the first connecting portion.