Visualase:

Visualase™ is an MRI-guided, minimally invasive laser ablation system that lets you monitor tissue ablation in real-time to avoid injuring tissues outside the target area. Laser energy is delivered via an applicator only 1.65 mm in width that requires no more than a 3.2 mm burr hole, which means that little if any hair has to be shaved off. Detection of ablation is done using MRI thermographic imaging. Multi-plane monitoring and superimposition of MR thermometry and thermal damage estimate maps on top of each other provides accurate targeting of exactly the tissue desired. Visualase was acquired by Medtronic in 2014 in a deal worth up to $105 million and is currently on the market.