خط کش ( ruler )
خط کش ( ruler ) : یک خط کش از جنس فولاد ضد زنگ است که در واحد میلی متر و اینچ مدرج شده است .
سایراسامی : measuring strik
مورز استفاده: جهت اندازه گیری ساختارها و فواصل ، به کار می رود.
توضیحات بیشتر : خط کش ها ممکن است پلاستیکی باشند .
تصویر خط کش RULER :
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In the correction of complex multi-component and multiplanar deformities
using the Ilizarov
frame, unified reduction nodes have to be replaced three to five times (Fig. 1).
Every frame re-assembly involves a change in the reductional units and is a
highly laborious process in which there is additional patient exposure to
Sometimes, due to the peculiarities of frame assembly (external
supports are not oriented at a right angle to the axes of the bone fragments, a
bone is not at the center of a support, the support for some reason is not
closed, etc.), correction of one component can lead to the secondary
translation of other(s).
These secondary translations will, in turn, require
correction and therefore additional frame re-assembly [Solomin L.N. et al.,
Certainly, the problem of the directed accurate moving of object in
three-dimensional space demands the decision not only in orthopedic
surgery, but also in many branches of technique.
directions in the given area is application of hexapods.
structurally consist of two (basic and mobile) platforms to be connected by
six telescopic rods of a special design, so-called struts.
The ways in which the struts connect to each other and to the
platforms differ and depend upon the author’s approach (Fig. 2).
number of struts is not connected with the number of planes and the
degrees of freedom that the platforms must have relative to each other:
when five struts are used, the system loses its stability, while seven struts
The first hexapod was proposed by Gough in 1947 [Bonev I., 2003] for
testing wheels exposed to combined forces (Fig. 2a).
Ceppel, in 1962,
unaware of Gough’s invention, created a similar mechanism while
developing a vibration device (Fig. 2b).
Stewart, in 1965 [Bonev I., 2003],
proposed a platform on the basis of the original hexapod (Fig. 2c).