Appeal No. 97-0684
Application 08/171,343
Independent claim 1 is illustrative of the appealed subject
matter, and reads as follows:
1. A two tube, two lumen coaxial balloon dilation catheter
comprising:
an elongate, flexible catheter shaft having a proximal
region, a proximal end and a distal end, wherein the shaft is
formed from an inner tube defining a guidewire lumen
therethrough, and a surrounding outer tube coaxial with the inner
tube and defining an annular inflation lumen therebetween, the
inner tube being of smaller diameter than the outer tube and
having a distal end region extending distally of the distal end
of the outer tube;
an inflatable dilation balloon having a proximal end and a
distal end, the proximal end of the balloon being attached to the
distal region of the outer tube, the distal end of the balloon
being attached to the distal region of the inner tube at a distal
connection;
the outer tube being attached to the inner tube at a
location between the proximal region of the catheter shaft and
said distal connection to resist axial telescoping of the inner
tube with respect to the outer tube when the catheter is advanced
against a resistance at the distal region of the catheter, the
outer tube terminating proximally of said distal connection;
means for communicating the annular inflation lumen with the
interior of the balloon to facilitate inflation and deflation of
the balloon, the inflation lumen comprising the sole lumen in
communication with the interior of the balloon; and
means at the proximal end of the catheter for accessing each
of the guidewire and inflation lumens.
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