Appeal No. 2000-1948 Page 9
Application No. 08/751,087
Figures 1 and 4 of Williams show a cross-sectional view
of the thumbswitch 100 and thumbswitch pushbutton locking
mechanism. The thumbswitch has a distal thumb grip portion
280, a proximal thumb grip portion 285, and vertical posts
172, 174, that
connect the thumb grip portion with the flush port and plunger
assembly 30. The thumbswitch includes a pushbutton locking
mechanism having a pushbutton 295 connected to a cap shaped
member 300. The sleeve retraction thumbswitch is locked into
place on the catheter handle by having cap shaped member 300
engage spaced semicircular recesses 105, 110, via laterally
projecting semicircular arms 303, 306. The spaced recesses
are located on the underside of the housing top half 60, along
the underside of slot 90, and are locations where the
thumbswitch may be locked to fix the retraction of sleeve 10.
Williams teaches (column 4, lines 35-37) that "[t]he recesses
may be spaced at a plurality of locations, to give a plurality
of stops." The cap shaped locking member 300 and pushbutton
295 are spring biased upwards with respect to the plunger and
flush port assembly 190 by a spring 315, that continuously
forces the cap shaped locking member against the underside of
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Last modified: November 3, 2007