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Conic cannulas offer multiple benefits for spine cement injection
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Use of conic cannulas for spine cement injection helped reduce extravertebral pressure during injection and minimized filter-pressing problems through the optimization of fluid flow velocity profiles, study results showed.
An experimental study was performed to analyze the influence of the cannula geometry on the pressure drop and the cement flow velocity established along the cannula during spine cement injection. Using computer-assisted design software, researchers drew straight, conic and combined conic-straight new cannulas with different proximal and distal length and diameter ratios. The cannulas were then analyzed with Hagen-Poisseuille law and computational fluid dynamics, and experimental models were manufactured and tested for extrusion to confirm the results.
The researchers found that the completely conic cannula model, with a proximal to distal diameter ratio of 2, required the lowest amount of injection pressure.
Additionally, no discontinuity was seen in the velocity profile at any point along the length of the cannula when compared with other known cannulas that had discontinuity at the proximal-distal transition zone.
Disclosure: The authors have no relevant financial disclosures.
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