October 11, 2005 Travis Baugh President & CEO MicroMed Cardiovascular, Inc. 8965 Interchange Drive Houston, Texas 77056 Dear Travis:

Exhibit 99.1

October 11, 2005

Xxxxxx Xxxxx
President & CEO
MicroMed Cardiovascular, Inc.
0000 Xxxxxxxxxxx Xxxxx
Xxxxxxx, Xxxxx 00000

Dear Xxxxxx:

In the Employment and Separation Agreement effective as of January 17, 2005, I agreed to voluntarily resign as Chairman of the Board of MicroMed Technology effective October 11, 2005. In accordance with that agreement, I hereby resign as a Director and Chairman of the Board of Directors of MicroMed Technology, Inc. I also hereby resign as a Director of MicroMed Cardiovascular, Inc.

Both resignations are effective as of this date.

Sincerely,

/s/ Xxxxxx Xxxxxxxx

Xxxxxx X. Xxxxxxxx