Interference No. 103,270
apparatus using the "balloon on a stick" concept, i.e. (KR-42,
43):
The "balloon on a stick" concept was
essentially a captivation balloon on a
fixed wire type of device. Peter Keith
disclosed that during a catheter exchange a
balloon dilatation catheter could be pulled
back over a guidewire and into a guide
catheter thereby exposing the guidewire
distal of the dilatation balloon within the
guide catheter lumen proximate the distal
end of the guide catheter. Peter Keith
then disclosed that the captivation device
could be advanced down the guide catheter
from the proximal end thereof, and past the
dilatation balloon such that the
captivation balloon was positioned adjacent
the exposed portion of the guidewire,
distal of the dilatation balloon but within
the lumen of the guide catheter proximate
the distal end of the guide catheter.
Peter Keith further disclosed that
the captivation balloon could then be
inflated to lock, or hold the guidewire
against the inner wall of the guide
catheter. This would prevent the guidewire
from moving proximally or distally during
the remainder of the catheter exchange.
Since the guidewire was immobilized, the
balloon dilatation catheter could be
completely withdrawn in a proximal
direction from the guidewire without
utilizing an extension
wire. Thereafter, a different balloon
dilatation catheter could be advanced over
the guidewire into the guide catheter until
the proximal end of the dilatation catheter
extended distally of the proximal end of
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