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US5057106A
Expired / Lapsed
US
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Microwave balloon angioplasty
Assignee: KASEVICH ASSOCIATES Inc
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Filing: 1990-07-09
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Granted: 1991-10-15
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Expires: 2010-07-09
Abstract
Abstract A microwave catheter system used for heating arterial plaque and including a catheter member adapted for positioning in the artery and an inflatable balloon supported at the distal end of the catheter member. Microwave energy is coupled by means of a transmission line to an antenna means. An optic fiber extends through the catheter member and may be used for temperature sensing or other purposes. A channel is provided through the catheter member for coupling a fluid to the balloon for inflation thereof.
Inventors
- 👤 Raymond S. Kasevich
- 👤 James F. McQueeney
- 👤 Ronald H. Crooker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/08; A; A61; A61B; A61B18/00; A61B18/18; A61B18/1815; A61B17/00; A61B2017/00017; A61B2017/00022; A61B2017/00057; A61B2017/00084; A61B2017/00831; A61B2017/00853; A61B17/22; A61B2017/22001; A61B2017/22051; A61B2017/22062; A61B2018/00053; A61B2018/00273; A61B2018/00279; A61B2018/00285; A61B2018/00571; A61B2018/00577; A61B2018/00636; A61B2018/00696; A61B2018/00738; A61B2018/1861; A61M; A61M25/00; A61M25/10; A61M25/104
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
144 words
A microwave catheter system for heating arterial plaque, comprising: a flexible catheter member having a distal end and a proximal end, and adapted for positioning in an artery, an inflatable balloon supported at the distal end of the catheter member, a microwave signal generator at the proximal end of the catheter member, transmission line means for transmitting energy coupled from said signal generator through said catheter member and including at the distal end thereof an antenna means for radiating energy substantially uniformly and controllably into said artery, optic fiber means for transmitting optical energy extending through said catheter member between proximal and distal ends thereof and having one end thereof disposed in said balloon in juxtaposition with said antenna means, and channel means extending through said catheter member between proximal and distal ends thereof for coupling a fluid to said balloon for inflation thereof.
Claim 2
Dependent Claim
144 words
A microwave catheter system for heating arterial plaque, comprising: a flexible catheter member having a distal end and a proximal end, and adapted for positioning in an artery, an inflatable balloon supported at the distal end of the catheter member, a microwave signal generator at the proximal end of the catheter member, transmission line means for transmitting energy coupled from said signal generator through said catheter member and including at the distal end thereof an antenna means for radiating energy substantially uniformly and controllably into said artery, optic fiber means for transmitting optical energy extending through said catheter member between proximal and distal ends thereof and having one end thereof disposed in said balloon in juxtaposition with said antenna means, and channel means extending through said catheter member between proximal and distal ends thereof for coupling a fluid to said balloon for inflation thereof.
Claim 3
Dependent Claim
46 words
A microwave catheter system for heating arterial plaque as set forth in claim 1, wherein said channel means has an entrance port to said balloon, and further including a pressurized fluid source coupled to said channel means for introducing the fluid to the balloon under pressure.
Claim 4
Dependent Claim
34 words
A microwave catheter system for heating arterial plaque as set forth in claim 2 further including means for exciting the signal generator for a predetermined period of time upon injection of said inflating fluid.
Claim 5
Dependent Claim
42 words
A microwave catheter system for heating arterial plaque as set forth in claim 3 wherein said optic fiber means has a sensor at the distal end within the balloon to measure temperature in the balloon or at the surface of the balloon.
Claim 6
Dependent Claim
33 words
A microwave catheter system for heating arterial plaque as set forth in claim 4 including a pair of sensors coupled to said fiber means for measuring temperature at two locations within the balloon.
Claim 7
Dependent Claim
24 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said antenna means comprises a collinear array of antennae.
Claim 8
Dependent Claim
24 words
A microwave catheter system for heating arterial plaque as set forth in claim 6 wherein the collinear array antennae is disposed inside the balloon.
Claim 9
Dependent Claim
33 words
A microwave catheter system for heating arterial plaque as set forth in claim 6 wherein said balloon has a skin and the collinear array antennae is disposed within the skin forming the balloon.
Claim 10
Dependent Claim
30 words
A microwave catheter system for heating arterial plaque as set forth in claim 6 wherein the collinear array antennae is formed in a spiral to provide full balloon circumferential coverage.
Claim 11
Dependent Claim
30 words
A microwave catheter system for heating arterial plaque as set forth in claim 6 wherein the collinear array antennae is formed in a helix to provide full balloon circumferential coverage.
Claim 12
Dependent Claim
41 words
A microwave catheter system for heating arterial plaque as set forth in claim 6 wherein said collinear array antennae includes separate antenna sections and further includes power divider means for intercoupling from the transmission line means to the separate antenna sections.
Claim 13
Dependent Claim
34 words
A microwave catheter system for heating arterial plaque as set forth in claim 11 wherein said balloon has a skin and the separate antenna sections are disposed in opposite locations in the balloon skin.
Claim 14
Dependent Claim
25 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said antenna means comprises a plurality of collinear array antennae.
Claim 15
Dependent Claim
39 words
A microwave catheter system for heating arterial plaque as set forth in claim 13 wherein said transmission line means further comprises separate transmission lines in the catheter member for delivering electrical energy to each of the collinear array antennae.
Claim 16
Dependent Claim
22 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said antenna means comprises a microstrip radiator.
Claim 17
Dependent Claim
33 words
A microwave catheter system for heating arterial plaque as set forth in claim 15 wherein said microstrip radiator is comprised of a conductive strip and a ground plane inter-separated by a dielectric substrate.
Claim 18
Dependent Claim
26 words
A microwave catheter system for heating arterial plaque as set forth in claim 15 wherein said radiator is of annular configuration, having an outer radiating strip.
Claim 19
Dependent Claim
51 words
A microwave catheter system for heating arterial plaque as set forth in claim 15 wherein said radiator includes a hollow member coated with a thin conductive film to form a ground plane, a thin dielectric film over the ground plane, and a conductive antenna pattern printed over the dielectric film surface.
Claim 20
Dependent Claim
23 words
A microwave catheter system for heating arterial plaque as set forth in claim 18 wherein said antenna pattern is in a spiral form.
Claim 21
Dependent Claim
31 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said transmission line means has a center conductor of sufficient stiffness to form a guide wire.
Claim 22
Dependent Claim
34 words
A microwave catheter system for heating arterial plaque as set forth in claim 20 including impedance matching means along said center conductor at the location where the center conductor enters and leaves the balloon.
Claim 23
Dependent Claim
39 words
A microwave catheter system for heating arterial plaque as set forth in claim 21 wherein the transmission line means has an outer conductor except at positions within the balloon, a tip of the center conductor extending beyond said balloon.
Claim 24
Dependent Claim
35 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said antenna means comprises a plurality of metallic filaments each having a resonant length at the microwave frequency of operation.
Claim 25
Dependent Claim
25 words
A microwave catheter system for heating arterial plaque as set forth in claim 23 including an active antenna in the balloon for exciting the filaments.
Claim 26
Dependent Claim
22 words
A microwave catheter system for heating arterial plaque as set forth in claim 24 wherein the filaments are disposed inside the balloon.
Claim 27
Dependent Claim
25 words
A microwave catheter system for heating arterial plaque as set forth in claim 24 wherein the filaments are disposed within the skin of the balloon.
Claim 28
Dependent Claim
52 words
A microwave catheter system for heating material plaque as set forth in claim 1 wherein said balloon has an inside surface and said antenna means is comprised of a plurality of spacedly disposed antenna wires arranged about the balloon near the inside surface thereof and commonly coupled to said transmission line means.
Claim 29
Dependent Claim
59 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said optic fiber means comprises a fiber core and said transmission line means comprises multiply deposited layers on said core including a conductive layer defining an inner conductor, a dielectric coating defining an insulating layer and an outer conductive layer defining an outer conductor.
Claim 30
Dependent Claim
42 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said balloon has a skin and is constructed of a compliant material loaded with a lossy material to allow the balloon skin to absorb microwave energy directly.
Claim 31
Dependent Claim
27 words
A microwave catheter system for heating arterial plaque as set forth in claim 1 wherein said balloon is coated with a lossy material to absorb microwave energy.
Claim 32
Dependent Claim
23 words
A microwave catheter system for heating arterial plaque as set forth in claim 29 wherein the lossy material includes ferrite or graphite material.
Claim 33
Dependent Claim
22 words
A microwave catheter system for heating arterial plaque as set forth in claim 1, wherein said antenna means comprises a helical antenna.
Claim 34
Dependent Claim
20 words
A microwave catheter system for heating arterial plaque as set forth in claim 32, wherein said helical antenna is tapered.
Claim 35
Dependent Claim
27 words
A microwave catheter system for heating arterial plaque as set forth in claim 1, wherein said antenna means comprises a segment of transmission line within said balloon.
Claim 36
Dependent Claim
53 words
A microwave catheter system for heating arterial plaque as set forth in claim 34, wherein a section of said transmission line within the balloon is comprised of a center conductor, a dielectric material disposed about the center conductor and a thin metallic film deposited over the dielectric material and forming an outer conductor.
Claim 37
Dependent Claim
25 words
A microwave catheter system for heating arterial plaque as set forth in claim 35, wherein the thin metallic film is deposited by physical vapor deposition.
Claim 38
Dependent Claim
25 words
A microwave catheter system for heating arterial plaque as set forth in claim 35, wherein the thin metallic film is deposited by chemical vapor deposition.
Claim 39
Independent Claim
182 words
A device for heating arterial plaque having a proximal section adapted to be coupled to a source of electromagnetic energy and a distal section for radiating said energy, comprising: a collinear array antenna formed by a continuous inner conductor, and a distal end in the distal section surrounded by dielectric material and an interrupted coaxial outer conductor longitudinally extending at one end from the proximal section to another end at the distal section and wherein the interruptions are in the form of circumferential gaps periodically spaced along the coaxial conductor at interrelated harmonic wavelengths to radiate a substantially uniform beam pattern of electromagnetic energy about the periphery of the antenna and an impedance matching means at the proximal section for matching the impedance of the antenna to the impedance of the source of electromagnetic energy, a catheter member supporting at a catheter member distal end an inflatable balloon and further comprising an impedance matching means at a distal side of said balloon for reducing current leakage outside said balloon at said catheter member distal end, said balloon enclosing said collinear array antenna.
Claim 40
Independent Claim
182 words
A device for heating arterial plaque having a proximal section adapted to be coupled to a source of electromagnetic energy and a distal section for radiating said energy, comprising: a collinear array antenna formed by a continuous inner conductor, and a distal end in the distal section surrounded by dielectric material and an interrupted coaxial outer conductor longitudinally extending at one end from the proximal section to another end at the distal section and wherein the interruptions are in the form of circumferential gaps periodically spaced along the coaxial conductor at interrelated harmonic wavelengths to radiate a substantially uniform beam pattern of electromagnetic energy about the periphery of the antenna and an impedance matching means at the proximal section for matching the impedance of the antenna to the impedance of the source of electromagnetic energy, a catheter member supporting at a catheter member distal end an inflatable balloon and further comprising an impedance matching means at a distal side of said balloon for reducing current leakage outside said balloon at said catheter member distal end, said balloon enclosing said collinear array antenna.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |