Exhibit 24.2

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Kevin R. Green and Anthony W.
Rees, his true and lawful attorneys-in-fact and agents, with full powers of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities to execute a Registration Statement on Form S-8 to be
filed under the Securities Act of 1933, as amended, for the registration of
1,300,000 shares of Common Stock of Summit Medical Systems, Inc. under its 1993
Stock Option Plan, and any and all post-effective amendments thereto, and to
file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated:  November 5, 1996




/s/ John M. Nehra
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John M. Nehra