Related Experiment Video
Updated: Jun 14, 2025
08:55
Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
Published on: April 24, 2020
3.0K
Thiel cadaver eye as a training model for sub-Tenon's blocks: a feasibility study.
Friedrich Lersch1, Damian Schnidrig2, Susanne Boemke3
1Department of Anaesthesiology, Inselspital, University Hospital Bern, Bern, 3010, Switzerland. friedrich.lersch@insel.ch.
BMC Ophthalmology
|September 3, 2024
Summary
Thiel cadavers provide a viable training model for sub-Tenon's blocks, demonstrating intact ocular tissues and successful cannula placement. Despite challenges with eye desiccation, these models offer valuable practice for regional anesthesia procedures.
Area of Science:
- Ophthalmology
- Anesthesiology
- Anatomical Pathology
Background:
- Effective regional anesthesia training models are crucial for ocular procedures.
- Conventional embalming methods can compromise cadaveric tissue integrity.
- Thiel cadavers offer an alternative for anatomical fidelity in surgical training.
Purpose of the Study:
- To evaluate Thiel cadavers as a training model for sub-Tenon's blocks.
- To assess the integrity of ocular tissues in Thiel cadavers.
- To measure insertion forces for sub-Tenon's blocks in Thiel cadavers.
Main Methods:
- Utilized twenty eyes from ten Thiel cadaver heads for sub-Tenon's block training.
- Performed ultrasound examinations and measured axial length before and after volume injection.
- Measured insertion forces for mock sub-Tenon's blocks and assessed the ultrasound 'T-sign'.
Main Results:
- Ocular tissues (conjunctiva, Tenon's layer) were intact, with successful cannula placement in all cases.
- Median 'T-sign' thickness measured 2.72 mm; average maximum cannula insertion force was 2.92 Newtons.
- Insertion forces in Thiel cadavers were higher than in pig eyes, indicating a different tissue resistance.
Conclusions:
- Thiel cadavers are a promising model for training in sub-Tenon's blocks.
- The model allows for assessment of tissue integrity and insertion forces.
- Further research may refine the use of Thiel cadavers for ocular regional anesthesia training.
