External ventricular drain (EVD) placement is a life-saving surgical procedure that treats hydrocephalus, a build-up of fluid and pressure in the center of the brain.
The Problem: A 'Blind' procedure
EVD placement (also known as ventriculostomy) typically occurs at the bedside in the ICU or in the operating room (OR), and the targeting of the cerebral ventricles (the fluid-filled center of the brain) is done in a 'blind' or freehand fashion: no imaging guidance is used. The optimal path for EVD insertion in an individual patient is estimated by the surgeon, using surface landmarks.
Two very serious problems arise from 'blind' EVD placement:
- malplacement (at the end of the procedure, the EVD catheter is in the wrong place
- multiple passes (during the procedure, the catheter may need to be passed across the brain multiple times)
The literature shows that the rate of EVD malplacement is extremely high: about 17% of the time, the catheter is not in the correct location.
The Solution: Ultrasound-guided VENTRICULOSTOMY
Bedrock's solution is an easy-to-use ultrasound guidance system that allows Neurosurgeons and Neurointensivists to accurately place EVDs, ventriculoperitoneal shunts, and Ommaya reservoirs at the bedside or in the OR.
The following sequence demonstrates how the system works. In the photographs, a laser locator is used for illustrative purposes in lieu of the ultrasound probe:
READ THE PATENTs
For much more detailed information on how ultrasound-aligned EVD placement works, click here to read the granted U.S. patent (Flint 2015, #9,039,615), or here to read the 1st divisional patent (Flint 2016, #9,408,629).