Related Experiment Video
Updated: Apr 28, 2026
Cannula Implantation into the Cisterna Magna of Rodents
Published on: May 23, 2018
Advantageous new conic cannula for spine cement injection
Sergio Gómez González1, María Daniela Vlad, José López López
1*Interdepartment Research Group for the Applied Scientific Collaboration (IRGASC), Division of Biomaterials & Bioengineering, Technical University of Catalonia (UPC), Barcelona, Spain; and †Faculty of Medical Bioengineering, "Gr. T. Popa" University of Medicine and Pharmacy, Iasi, Romania.
New conic cannulas significantly reduce injection pressure and improve cement flow for vertebroplasty. These optimized geometries minimize filter-pressing issues, especially with ceramic bone cements, enhancing their clinical use.
Area of Science:
- Biomedical Engineering
- Materials Science
- Orthopedic Surgery
Background:
- Vertebroplasty treats vertebral compression fractures, requiring efficient delivery of bone cement.
- Ceramic bone cements face clinical limitations due to press-filtering issues.
- Optimized cannula geometry is crucial for successful bone cement delivery.
Purpose of the Study:
- To investigate the impact of novel cannula geometries on extravertebral injection pressure.
- To analyze cement flow velocity profiles within cannulas during injection.
- To reduce press-filtering problems associated with calcium phosphate-based bone cements.
Main Methods:
- Computer-aided design (CAD) for creating straight, conic, and combined conic-straight cannulas.
- Theoretical analysis using Hagen-Poisseuille law and computational fluid dynamics (CFD).
- Experimental extrusion testing of manufactured cannula models to validate theoretical findings.
Main Results:
- The conic cannula with a 2:1 proximal-to-distal diameter ratio demonstrated the lowest injection pressure.
- Conic cannulas exhibited continuous velocity profiles, avoiding the discontinuities seen in straight cannulas.
- This improved flow characteristic is vital for minimizing filter-pressing.
Conclusions:
- Conic cannulas effectively reduce extravertebral injection pressure during vertebroplasty.
- Optimized flow profiles in conic cannulas minimize filter-pressing, particularly for ceramic bone cements.
- Easily manufacturable conic cannulas are expected to promote wider use of calcium phosphate bone cements in spinal procedures.
