Balloon catheter with balloon surface retention means

Claim 2

An elongated flexible catheter for supplying perfusion liquid to a bodily vessel having an orifice, the catheter comprising: a body having a proximal end, a distal end receivable in a vessel by way of the vessel orifice, and an infusion lumen formed within the body and extending between the proximal end and the distal end; at least one infusion lumen outlet at the catheter distal end for discharge of liquid from the lumen; a radially expandable sealing member surrounding the body proximally of the outlet, the sealing member being receivable in the orifice in its unexpanded state and expandable into engagement with a vessel wall to form a seal of the orifice thereof; the sealing member including a plurality of spaced apart felt patches affixed to the outer surface of the sealing member to enhance the purchase between the vessel wall and the sealing member in the expanded state to resist removal of the distal end from the vessel and loss of the seal.

Claim 3

An elongated flexible catheter for supplying perfusion liquid to a bodily vessel having an orifice, the catheter comprising: a body having a proximal end, a distal end receivable in a vessel by way of the vessel orifice, and an infusion lumen formed within the body and extending between the proximal end and the distal end; at least one infusion lumen outlet at the catheter distal end for discharge of liquid from the lumen; a radially expandable inflatable balloon surrounding the body proximally of the outlet, the inflatable balloon being receivable in the orifice in its unexpanded state and expandable into engagement with a vessel wall to form a seal of the orifice thereof; the inflatable balloon including a continuous felt strip affixed to and encircling the outer surface of the balloon to enhance the purchase between the vessel wall and the balloon in the expanded state to resist removal of the distal end from the vessel and loss of the seal, the felt strip being arranged to allow expansion of the balloon while maintaining a continuous loop encircling the balloon.

Claim 4

An elongated flexible catheter for supplying perfusion liquid to a bodily vessel having an orifice, the catheter comprising: a body having a proximal end, a distal end receivable in a vessel by way of the vessel orifice, and an infusion lumen formed within the body and extending between the proximal end and the distal end; at least one infusion lumen outlet at the catheter distal end for discharge of liquid from the lumen; a radially expandable inflatable balloon surrounding the body proximally of the outlet, the inflatable balloon being receivable in the orifice in its unexpanded state and expandable into engagement with a vessel wall to form a seal of the orifice thereof; the inflatable balloon including a continuous felt strip affixed to and encircling the outer surface of the balloon to enhance the purchase between the vessel wall and the balloon in the expanded state to resist removal of the distal end from the vessel and loss of the seal, the felt strip being arranged to allow expansion of the balloon while maintaining a continuous loop encircling the balloon.

Claim 5

A catheter according to claim 2 wherein the continuous felt strip is arranged in a zigzag pattern such that continuous loops formed of the strip are closer to each other when the balloon is deflated than when the balloon is inflated.