Gelatin Thoracic Paravertebral Teaching Model for Placement of a Continuous Infusion Catheter in the Extrathoracic...

Our aim was to develop an ultrasound-guided training curriculum for continuous infusion catheter placement in the paravertebral space and to create a gelatin thoracic spine-rib model for use in this training. We sought to create a model that was inexpensive and reusable such that multiple participants could use one model during training.

The model was prepared by embedding a firm foam thoracic spine replica with bilateral attached ribs into an opaque gelatin mixture. Once solidified, a preselected area was excised on each side, such that the model could be easily refilled with new gelatin blocks for use by each participant. This allowed for multiple participants to use the same model while eliminating confusion with prior tract marks.

The Marcia and Eugene Applebaum Simulation Learning Institute, Beaumont Hospital, Royal Oak, MI; a private nonprofit tertiary care hospital associated with the OUWB School of Medicine, Rochester, MI.

Fifty-two medical students and general surgery residents underwent a 30-minute didactic session on ultrasound technique for catheter placement followed by practice on the gelatin model.

The texture and echogenicity of the model were subjectively comparable to those of tissue in vivo and the osseous elements of the spine in the model were clearly identified using ultrasound. The exchangeable catheter placement area provided an efficient and effective method to test accurate performance in catheter placement by multiple users. Participants increased their confidence in the use of ultrasound for this procedure.

To date, this is the first gelatin thoracic spine-rib model that has been used to teach ultrasound-guided catheter insertion into the paravertebral space, with removable testing areas that can be used by multiple users. This model can provide an inexpensive training tool that can be used in a surgical simulation setting.