June 27, 1996


Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

    Re:  Infrasonics, Inc. -- Removal from Registration

Ladies and Gentlemen:

    Effective June 27, 1996 Infrasonics, Inc. (the"Company")
has been merged with and into Nellcor Puritan Bennett, Inc.
("NPB").

    Accordingly, the Company requests that the unsold
securities registered under the following registration
statements be removed from registration pursuant to an
undertaking under Section 512(a) of Regulation S-K:

    1.     An aggregate of 25,000 shares of the Company's
Common Stock issuable upon the exercise of options granted
under the Company's 1983 Employee Stock Option Plan and
registered under Registration Statements on Form S-8 (Nos.
33-01250m and 33-10515);

    2.     22,000 shares of the Company's Common Stock
issuable upon the exercise of options granted to certain
directors and registered under a Registration Statement on
Form S-8 (No. 33-44698)

    3.     An aggregate of 362,139 shares of the Company's 
Common Stock issuable upon the exercise of options granted
or to be granted under the Company's 1991 Stock Option Plan
and registered on a Registration Statements on Form S-8 
(Nos. 33-45244 and 33-45245); 

    4.     37,500  shares of the Company's Common Stock
issuable upon the exercise of a warrant granted to a
consultant to the Company and registered on a Registration
Statement on Form S-2 (No. 33-88402); and

    5.     515,900 shares of the Company's Common Stock
issuable upon exercise of options granted or to be granted
under the Company's 1995 Stock Option Plan and registered on
a Registration Statement on Form S-8 (No. 33-64037).  

    The Company understands that, under Rule 477(b) under
the Securities Act of 1933, as amended, this requested
removal is effective upon the filing of this letter.

                           Very truly yours,



                            /s/ Frederick C McGee
                            _____________________
                            Frederick C. McGee
                            Vice President of Finance and
                            Chief Financial Officer