 CryoLife Inc. said Thursday it is planning to offer 100 million in convertible senior notes that mature in 2024 in a private placement, joining the many companies issuing debt to bolster liquidity during the coronavirus pandemic. The maker of medical devices for cardiac and vascular surgical procedures said it will use the proceeds for general corporate purposes, including repaying about 30 million outstanding under its revolving credit facility. Shares were not active premarket, but have fallen 14 in the year to date, while the SP; 500 has fallen 4. 