Weeping balloon catheter
First Claim
1. A balloon catheter comprising:
- a catheter shaft extending along a longitudinal axis;
a first balloon mounted on the catheter shaft, the first balloon having a middle working region; and
a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length, and a plurality of holes formed in the middle working length to define a perforated portion, each of the first and second balloons movable to an expanded configuration to define an annular space therebetween, the annular space being in communication with the plurality of holes of the second balloon,the annular space comprising an annular working region disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, the corresponding portion comprising a series of longitudinal segments defining a plurality of steps each having a different cross-sectional area, the cross-sectional area of a first longitudinal segment being less than the cross-sectional area of a second longitudinal segment positioned distal to the first longitudinal segment, wherein the annular working region has an increasingly smaller cross-sectional area along the longitudinal axis in a distal direction.
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Accused Products
Abstract
Balloon catheters, and methods of treatment therewith, are provided including an inflatable first balloon at least partially enclosed by an expandable second balloon that has holes. The annular space between the first balloon and the second balloon is configured to promote delivery of the fluid evenly through holes in the second balloon to avoid problems of underloading and/or overloading. Preferably, the annular space is in communication with the holes, and the annular space is configured to receive and then to release and distribute the fluid via the holes in a substantially uniform manner such that even amounts of fluid are released in the distal and proximal holes. The first balloon may have various configurations including being tapered relative to the second balloon. The second balloon may also be tapered accordingly. The device may also include raised portions disposed in the annular space and configured to define channels having various configurations.
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Citations
18 Claims
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1. A balloon catheter comprising:
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a catheter shaft extending along a longitudinal axis; a first balloon mounted on the catheter shaft, the first balloon having a middle working region; and a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length, and a plurality of holes formed in the middle working length to define a perforated portion, each of the first and second balloons movable to an expanded configuration to define an annular space therebetween, the annular space being in communication with the plurality of holes of the second balloon, the annular space comprising an annular working region disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, the corresponding portion comprising a series of longitudinal segments defining a plurality of steps each having a different cross-sectional area, the cross-sectional area of a first longitudinal segment being less than the cross-sectional area of a second longitudinal segment positioned distal to the first longitudinal segment, wherein the annular working region has an increasingly smaller cross-sectional area along the longitudinal axis in a distal direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A balloon catheter comprising:
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a catheter shaft extending along a longitudinal axis; a first balloon mounted on the catheter shaft, the first balloon having a middle working region; and a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length and a plurality of holes formed in the middle working length to define a perforated portion, each of the first and second balloons movable to an expanded configuration to define an annular space therebetween, the annular space being in communication with the plurality of holes of the second balloon; wherein the annular space comprises an annular working region disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, and the annular working region has an increasingly smaller cross-sectional area along the longitudinal axis in a distal direction; and wherein the corresponding portion of the middle working region of the first balloon comprises a series of longitudinal segments defining a plurality of steps each having a different cross-sectional area, the cross-sectional areas of the steps becoming increasingly larger with each successive step in the distal direction. - View Dependent Claims (13)
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14. A balloon catheter comprising:
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a catheter shaft extending along a longitudinal axis; a first balloon mounted on the catheter shaft, the first balloon having a middle working region; and a second balloon mounted around at least a portion of the first balloon, the second balloon having a middle working length, and a plurality of holes formed in the middle working length to define a perforated portion, each of the first and second balloons movable to an expanded configuration to define an annular space therebetween, the annular space being in communication with the plurality of holes of the second balloon, the annular space comprising an annular working region disposed between the perforated portion of the middle working length of the second balloon and a corresponding portion of the middle working region of the first balloon, the corresponding portion comprising a series of longitudinal segments defining a plurality of steps each having a different cross-sectional area, the annular working region comprising a series of longitudinal annular segments each having a different cross-sectional area, wherein the annular working region has an increasingly smaller cross-sectional area along the longitudinal axis in a distal direction, wherein the series of longitudinal annular segments includes a first longitudinal annular segment having a first cross-sectional area and a second longitudinal annular segment having a second cross-sectional area and positioned distal to the first longitudinal annular segment, the second cross-sectional area of the second longitudinal annular segment being less than the first cross-sectional area of the first longitudinal annular segment. - View Dependent Claims (15, 16, 17, 18)
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Specification