Massachusetts-based devicemaker Thermedical secured $5.5 million to hire additional staff and advance research in ablation for solid tumors and ventricular tachycardia, a dangerous arrhythmia of the heart, bringing the company's total first round of financing to $7 million. The FDA-cleared radio frequency thermal ablation system injects hot saline into the affected area to treat large amounts of tissue, according to a Mass High Tech report. Thermedical will begin human trials later this year. More