Varian brand Clinac, Medical Linear Accelerator, All Varian Clinac with Model Numbers: H14, H18, H26, H27, H28, H29, Hcx; Product is manufactured and distributed by Varian Medical Systems Inc., Palo Alto, CA The Trilogy Radiotherapy Delivery System is a radiation therapy accelerator intended to deliver megavoltage x-ray treatments for conventional radiotherapy (three dimensional conformal radiotherapy and intensity modulated radiotherapy) and stereotactic radiosurgery and radiotherapy. Stereotactic treatments are intended for therapy of lesions, e.g., arteriovenous malformations, primary tumors and metastases.

Varian has identified an anomaly whereby, following prolonged use, the screw fastener holding the wedge body to the tray may fail.

The firm, Varian Medical, sent an "Urgent Medical Device Correction" Letter dated March 28, 2011 to its customers. The letter described the product, problem and actions to be taken. The customers were instructed to immediately inspect all hard wedges for missing or sheared screw fasteners, if any wedge is found to have one or more missing or sheared screw fasteners, remove the wedge from use and notify Varian immediately; inspect all hard wedges for loose screw fasteners, and retighten as necessary, and implement a program of monthly inspection of wedges for loose or missing hardware. The customers were also instructed to advise the appropriate personnel working in their Radiotherapy Department of the content of this letter. Varian Service shall immediately begin an interim action to replace screw fasteners on all hard wedges for Clinacs installed prior to January 2004. Varian Service will contact the customers to arrange for the inspection visit. Varian also stated that they shall continue their Investigation of this issue to further clarify the exact conditions under which the wedge screw fasteners may fail, and to analyze possible final solutions. Varian will notify the customers when final determinations are made. If you require further clarification, please feel free to contact your local Varian Customer Support Services Manager and/or USA and Canada at 1-888-4265; Europe: +41 41 749 8844; or email: North America: [email protected]; Australia/New Zealand: [email protected]; Europe: support [email protected]; South East Asia: [email protected]; China/Asia: [email protected]; Japan: Japan.apps [email protected]; Latin America: [email protected], a d Internet: Oncology Systems-www.myvarian.com or Varian Medical Systems - www.varian.com.