FIRST AMENDMENT TO PUT AND CALL OPTION AGREEMENT

Exhibit 10.17

FIRST AMENDMENT

TO

PUT AND CALL OPTION AGREEMENT

THIS FIRST AMENDMENT TO PUT AND CALL AGREEMENT (this “First Amendment”), dated as of the 10th day of April, 2007 is entered into by and between Discus Holdings, Inc., a California corporation (“Discus”) and American Medical Technology, Inc, a Delaware corporation (“AMT”).

RECITALS

WHEREAS, Discus and AMT entered into a certain Put and Call Option Agreement dated April 11, 2006 (“P&C Agreement”);

WHEREAS, the P&C Agreement provides that neither party may exercise their respective Option (as defined in therein) before April 11, 2007;

WHEREAS, the parties wish to extend the date to which the parties may not exercise their Option in accordance with the terms stated in this First Amendment.

AGREEMENT

  NOW, THEREFORE , in consideration of the covenants set forth in this Agreeme