A modified Tuohy needle tip design for catheter over needle catheterization: in vitro testing

This is a preview of subscription content, access via your institution.



  1. 1.

    Tsui BC, Tsui J. Less leakage and dislodgement with a catheter-over-needle versus a catheter-through-needle approach for peripheral nerve block: an ex vivo study. Can J Anesth 2012; . https://doi.org/10.1007/s12630-012-9713-9.

    Article  PubMed  Google Scholar 

  2. 2.

    Edwards RM, Currigan DA, Bradbeer S, Mitchell C. Does a catheter over needle system reduce infusate leak in continuous peripheral nerve blockade: a randomised controlled trial. Anaesth Intensive Care 2018; . https://doi.org/10.1177/0310057x1804600507.

    Article  PubMed  Google Scholar 

  3. 3.

    Frölich MA, Caton D. Pioneers in epidural needle design. Anesth Analg 2001; . https://doi.org/10.1097/00000539-200107000-00043.

    Article  PubMed  Google Scholar 

  4. 4.

    Kim IS, Shin HK, Kim DY. Iatrogenic catheter sheath shearing during radial artery cannulation. Korean J Anesthesiol 2013; . https://doi.org/10.4097/kjae.2013.65.6S.S12.

    Article  PubMed  PubMed Central  Google Scholar 

Download references


Dr. Tsui is the inventor of the modified Tuohy needle design for catheter-over-the-needle catheterization and also has a patent-licensing agreement for its design with Pajunk Medical, Germany.

Funding statement


Editorial responsibility

This submission was handled by Dr. Hilary P. Grocott, former Editor-in-Chief, Canadian Journal of Anesthesia.

Author information



Corresponding author

Correspondence to Jonathan Jenkin Tsui BSc (Hons), MBChB.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Tsui, J.J. A modified Tuohy needle tip design for catheter over needle catheterization: in vitro testing. Can J Anesth/J Can Anesth (2021). https://doi.org/10.1007/s12630-021-01934-2

Download citation