US5295995A — Perfusion dilatation catheter

Claim 1

Independent Claim 125 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; and, an inflatable balloon affixed near said distal end of said shaft and surrounding the circumference of said shaft, said balloon having a wall of substantially constant thickness and at least two substantially rounded axial protrusions formed in said wall said protrusions having a common internal chamber with substantially no internal boundaries, wherein upon expansion of said balloon, said protrusions come into apposition with the walls of said target vessel, such that said balloon upon expansion, becomes non-circular, thereby forming blood flow paths around said protrusions.

Claim 2

Dependent Claim 125 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; and, an inflatable balloon affixed near said distal end of said shaft and surrounding the circumference of said shaft, said balloon having a wall of substantially constant thickness and at least two substantially rounded axial protrusions formed in said wall said protrusions having a common internal chamber with substantially no internal boundaries, wherein upon expansion of said balloon, said protrusions come into apposition with the walls of said target vessel, such that said balloon upon expansion, becomes non-circular, thereby forming blood flow paths around said protrusions.

Claim 3

Dependent Claim 78 words

The catheter of claim 1 wherein said target vessel has a nominal radius, and wherein said protrusions of said balloon, upon expansion, have a maximum height which does not exceed said nominal radius of said target vessel, and further wherein multiple radii of said balloon's cross-section, said multiple radii extending from a center of said tubular shaft to an outer surface point of said balloon, are of lesser radial dimension than said nominal radius of said target vessel.

Claim 4

Dependent Claim 13 words

The catheter of claim 1 including a radiopaque marker affixed to said shaft.

Claim 5

Dependent Claim 34 words

The catheter of claim 1 wherein said lumen of said tubular shaft is in communication with or is integral with an interior of said balloon, said lumen providing for the inflation of said balloon.

Claim 6

Dependent Claim 56 words

The catheter of claim 1 wherein said tubular shaft has a first lumen extending longitudinally through said shaft and being out of communication with the interior of said balloon, and a second lumen in communication with or integral with said interior of said balloon, said second lumen providing for the inflation and deflation of said balloon.

Claim 7

Dependent Claim 15 words

The catheter of claim 5 wherein said first and second lumen are a thermo-plastic polymer.

Claim 8

Dependent Claim 18 words

The catheter of claim 5 wherein said second lumen provides a surface on which to carry said balloon.

Claim 9

Dependent Claim 205 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; an expandable, inflatable tip affixed near said distal end of said shaft and surrounding the circumference of said shaft, wherein upon expansion of said tip concentrically around said shaft, said tip has a cross-section circumscribed by a circular perimeter of a cross-section of said target vessel; said target vessel having a nominal radius and said tip having a wall of substantially constant thickness and at least two rounded apices formed in said wall, said apices having a common internal chamber substantially with no internal boundaries, wherein a maximum height of said apices does not exceed said nominal radius of said target vessel, and further wherein multiple radii of said tip cross-section, said multiple radii extending from a center of said tubular shaft to an outer surface point of said tip, are of lesser radial dimension than said nominal radius of said target vessel; wherein said tip, upon expansion, forms a path for blood to flow past said tip and through areas of submaximal tip radial dimension.

Claim 10

Dependent Claim 205 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; an expandable, inflatable tip affixed near said distal end of said shaft and surrounding the circumference of said shaft, wherein upon expansion of said tip concentrically around said shaft, said tip has a cross-section circumscribed by a circular perimeter of a cross-section of said target vessel; said target vessel having a nominal radius and said tip having a wall of substantially constant thickness and at least two rounded apices formed in said wall, said apices having a common internal chamber substantially with no internal boundaries, wherein a maximum height of said apices does not exceed said nominal radius of said target vessel, and further wherein multiple radii of said tip cross-section, said multiple radii extending from a center of said tubular shaft to an outer surface point of said tip, are of lesser radial dimension than said nominal radius of said target vessel; wherein said tip, upon expansion, forms a path for blood to flow past said tip and through areas of submaximal tip radial dimension.

Claim 11

Dependent Claim 12 words

The catheter of claim 8 wherein said expandable tip is a balloon.

Claim 12

Dependent Claim 13 words

The catheter of claim 8 including a radiopaque marker affixed to said shaft.

Claim 13

Dependent Claim 34 words

The catheter of claim 8 wherein said lumen of said tubular shaft is in communication with or is integral with an interior of said tip, said lumen providing for the inflation of said tip.

Claim 14

Dependent Claim 56 words

The catheter of claim 8 wherein said tubular shaft has a first lumen extending longitudinally through said shaft and being out of communication with the interior of said tip, and a second lumen in communication with or integral with said interior of said tip, said second lumen providing for the inflation and deflation of said tip.

Claim 15

Dependent Claim 15 words

The catheter of claim 12 wherein said first and second lumen are a thermo-plastic polymer.

Claim 16

Dependent Claim 18 words

The catheter of claim 12 wherein said second lumen provides a surface on which to carry said tip.

Claim 17

Dependent Claim 193 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; an inflatable balloon tip affixed near said distal end of said shaft and surrounding the circumference of said shaft, said balloon tip having a wall of substantially constant thickness and at least two substantially rounded axial protrusions formed in said wall, said protrusions having a common internal chamber with substantially no internal boundaries, and wherein upon expansion of said balloon tip concentrically around said shaft, said balloon tip has a cross-section having at least two arcs of contact with said target vessel perimeter; said target vessel having a nominal radius and said arcs having a radius which is substantially equal in length to said nominal radius of said target vessel, and further wherein said arcs have multiple areas of lesser radial dimension than said nominal radius of said target vessel; said balloon tip, upon expansion, forming a path for blood to flow past said balloon tip and through areas of submaximal tip radial dimension.

Claim 18

Dependent Claim 193 words

A dilatation catheter adapted for insertion into a target vessel and subsequent inflation therein, the catheter comprising: a flexible elongated tubular shaft having proximal and distal ends defining at least one lumen and adapted for receiving a guide wire; an inflatable balloon tip affixed near said distal end of said shaft and surrounding the circumference of said shaft, said balloon tip having a wall of substantially constant thickness and at least two substantially rounded axial protrusions formed in said wall, said protrusions having a common internal chamber with substantially no internal boundaries, and wherein upon expansion of said balloon tip concentrically around said shaft, said balloon tip has a cross-section having at least two arcs of contact with said target vessel perimeter; said target vessel having a nominal radius and said arcs having a radius which is substantially equal in length to said nominal radius of said target vessel, and further wherein said arcs have multiple areas of lesser radial dimension than said nominal radius of said target vessel; said balloon tip, upon expansion, forming a path for blood to flow past said balloon tip and through areas of submaximal tip radial dimension.

Claim 19

Dependent Claim 13 words

The catheter of claim 15 including a radiopaque marker affixed to said shaft.

Claim 20

Dependent Claim 34 words

The catheter of claim 15 wherein said lumen of said tubular shaft is in communication with or is integral with an interior of said balloon, said lumen providing for the inflation of said balloon.

Claim 21

Dependent Claim 58 words

The catheter of claim 15 wherein said tubular shaft has a first lumen extending longitudinally through said shaft and being out of communication with the interior of said balloon, and a second lumen in communication with or integral with said interior of said balloon tip, said second lumen providing for the inflation and deflation of said balloon tip.

Claim 22

Dependent Claim 15 words

The catheter of claim 18 wherein said first and second lumen are a thermo-plastic polymer.

Claim 23

Dependent Claim 18 words

The catheter of claim 18 wherein said second lumen provides a surface on which to carry said balloon.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1997-03-21	1997-09-20	1998-03-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2001-03-21	2001-09-20	2002-03-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2005-03-21	2005-09-20	2006-03-22	$7700.00	Window Closed / Lapsed

Perfusion dilatation catheter

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