HeartWare International Inc. took another step in its chase after one-time suitor and main competitor Thoratec Corp. filing for an investigational device exemption from the Food & Drug Administration for clearance to use its miniature heart pump in patients with end-stage heart failure who aren’t eligible for a heart transplant. The Framingham, Mass.-based device maker’s left ventricular assist device is already cleared for use as a bridge to heart transplant.

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