IRIS International Inc. requested an extension to file its second quarter financial results due to emergency surgery for its interim chief financial officer. Veronica Tarrant has returned to work at the Chatsworth-based company on a part-time basis but her absence due to back surgery affected the company meeting the Aug. 9 filing deadline. Peter L. Donato becomes the new CFO effective Aug. 10. Iris International designs, manufactures and markets medical devices, diagnostic systems and consumables.