Medical External Fixators

External fixators have been used in the medical industry for more than a century and are used as a form of fixed temporary and definitive fractures in many cases of orthopedic clinics. Both bone mass and needle insertion techniques help create a stable bone interface. This article introduces you to various stabilization techniques to determine which pin type and insertion method will produce maximum stability.

Biomechanical studies have evaluated various components of external fixation.

Studies have shown that increasing the diameter and number of stitches is an important factor affecting the stability of the fixture. Increasing the number of connecting rods and reducing the distance between the connecting rod and the bone can also increase the stability of the outer holder. While each external fixation component acts as a stabilizer, the key to the bone interface is critical. Construction stiffness and stability. Recognizing the importance of the bone interface has led researchers to continue needle research and the development of hydroxyapatite-coated needles. These needles have been shown to increase the fixed pullout strength compared to uncoated needles. This study demonstrates another physical-generated biomechanical principle of needle insertion that increases fixation at the needle or bone interface. Compared to UCSD, UCST or BCST technology, the use of SD pins to fix BC results in significantly increased stiffness and maximum failure force when placed under bending moments. Although all SD and ST pins are made of stainless steel and are the same size, the three-point bending test shows that the SD pin is approximately 30% stronger in resisting bending forces. The small diameter of the ST pin is smaller than the small diameter of the SD pin. Although it is a slight difference, the bending strength of the cylinder is the fourth power of the radius. Therefore, small changes in small diameters result in significant changes in biomechanical properties. When an external fixation pin is selected, the surgeon may not be able to achieve a small diameter difference between the ST and SD needle designs, which will affect the overall structural strength to some extent.

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