US6669655B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonic element and catheter incorporating same
Assignee: Recor Medical Inc
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Filing: 2000-10-19
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Granted: 2003-12-30
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Expires: 2020-10-19
Abstract
Abstract A catheter carrying a radially-expansible ultrasonic transducer is threaded into the circulatory system and then the transducer is actuated to provide ultrasonic energy in a ring-like zone surrounding a blood vessel. Desirably, the transducer is arranged to focus the ultrasonic energy into a narrow, ring-like focal zone having an extent, in the axial direction along the catheter, less than the axial extent of the transducer. The transducer desirably is expanded after threading so that during application of the ultrasonic energy, the transducer bears on the interior wall of a blood vessel through a balloon covering the transducer. The transducer may include one or more resilient spiral elements carrying a flexible piezoelectric material.
Inventors
- 👤 David E. Acker
- 👤 Alfred Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:07
CPC Classifications
A; A61; A61N; A61N7/00; A61N7/02; A61N7/022; A61B; A61B17/00; A61B17/22; A61B17/22004; A61B17/22012; A61B17/2202; A61B17/00234; A61B2017/00238; A61B2017/00243; A61B2017/22027; A61B2017/22028; A61N2007/0056; A61N2007/0065; A61N2007/027
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
77 words
A sonic emitting element comprising a piezoelectric element having a radiating surface in the form of a surface of revolution of a generatrix about a central axis, said generatrix including a minimum point at a minimum distance from said central axis, a first portion sloping away from the axis in a first axial direction from said minimum point, and a second portion sloping away from said central axis in a second axial direction from said minimum point.
Claim 2
Dependent Claim
77 words
A sonic emitting element comprising a piezoelectric element having a radiating surface in the form of a surface of revolution of a generatrix about a central axis, said generatrix including a minimum point at a minimum distance from said central axis, a first portion sloping away from the axis in a first axial direction from said minimum point, and a second portion sloping away from said central axis in a second axial direction from said minimum point.
Claim 3
Dependent Claim
19 words
An element as claimed in claim 1 , wherein said first and second portions of said generatrix are curved.
Claim 4
Dependent Claim
37 words
An element as claimed in claim 2 , wherein said first and second portions of said generatrix are segments of a circle, whereby said radiating surface is in the form of a portion of a toroidal surface.
Claim 5
Dependent Claim
54 words
An element comprising a piezoelectric element having a radiating surface in the form of a portion of a toroidal surface having a central axis, said portion of said toroidal surface facing outwardly away from said central axis, whereby said emitting element will focus emitted sonic energy in a generally circular band surrounding the element.
Claim 6
Dependent Claim
54 words
An element comprising a piezoelectric element having a radiating surface in the form of a portion of a toroidal surface having a central axis, said portion of said toroidal surface facing outwardly away from said central axis, whereby said emitting element will focus emitted sonic energy in a generally circular band surrounding the element.
Claim 7
Dependent Claim
26 words
An element as claimed in any of claims 1 , 2 , 3 and 4 wherein said piezoelectric element is formed from a polymeric piezoelectric material.
Claim 8
Dependent Claim
21 words
An element as claimed in claim 1 wherein said piezoelectric element has a maximum diameter of about 1 cm or less.
Claim 9
Dependent Claim
61 words
A catheter comprising an element as claimed claim 6 , and an elongated catheter body having a proximal end, a distal end and a longitudinal axis extending between said ends, said element being mounted to said body remote from said proximal end so that said central axis of said element is substantially parallel with the longitudinal axis of the catheter body.
Claim 10
Dependent Claim
18 words
A catheter as claimed in claim 7 , further comprising a balloon surrounding said element and said catheter.
Claim 11
Dependent Claim
28 words
A catheter as claimed in claim 8 , wherein said balloon is substantially in the form of a surface of revolution about the longitudinal axis of the catheter.
Claim 12
Independent Claim
140 words
A method of treating tissue within the body of a subject comprising the steps of: (a) threading a catheter into a circulatory system of the subject so that a emitting element carried on said catheter is positioned within a circulatory vessel with a central axis of the emitting element substantially aligned with an axis of the circulatory vessel, said emitting element having an axial length in a direction along said central axis; (b) actuating said emitting element to emit sonic energy in a pattern which is generally symmetrical about said central axis, said sonic energy being emitted so that the sonic waves from different portions of said emitting element intersect and mutually reinforce one another in a ring-like focal region surrounding said central axis, said focal region having an axial length less than the axial length of said emitting element.
Claim 13
Independent Claim
140 words
A method of treating tissue within the body of a subject comprising the steps of: (a) threading a catheter into a circulatory system of the subject so that a emitting element carried on said catheter is positioned within a circulatory vessel with a central axis of the emitting element substantially aligned with an axis of the circulatory vessel, said emitting element having an axial length in a direction along said central axis; (b) actuating said emitting element to emit sonic energy in a pattern which is generally symmetrical about said central axis, said sonic energy being emitted so that the sonic waves from different portions of said emitting element intersect and mutually reinforce one another in a ring-like focal region surrounding said central axis, said focal region having an axial length less than the axial length of said emitting element.
Claim 14
Dependent Claim
38 words
A method as claimed in claim 10 , wherein sonic energy from different portions of the emitting element along the axial extent of emitting element is directed at different angles to the central axis of the radiating element.
Claim 15
Dependent Claim
24 words
A method as claimed in claim 10 wherein said actuating step is performed for a time sufficient to ablate tissue in said focal region.
Claim 16
Dependent Claim
18 words
A method as claimed in claim 12 wherein tissue disposed outside of said focal region is not ablated.
Claim 17
Dependent Claim
39 words
A method as claimed in claim 10 wherein said circulatory vessel is a blood vessel communicating with a chamber of the heart and wherein the emitting element is disposed adjacent the juncture of such blood vessel and the heart.
References Cited (Backward Citations)
US4087716A
Cited
US4205686A
Cited
US5099702A
Cited
US5111805A
Cited
US5069664A
Cited
US5380274A
Cited
US5316000A
Cited
US5762066A
Cited
US5630837A
Cited
US5840031A
Cited
US5471988A
Cited
US5735811A
Cited
WO1999002096A1
Cited
US6413254B1
Cited
US6361500B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-12-29 | 2007-06-30 | 2007-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-12-29 | 2011-06-30 | 2011-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-12-29 | 2015-06-30 | 2015-12-30 | $7700.00 | Window Closed / Lapsed |