Patent US6546271B1 successfully refreshed from Google Patents.
US6546271B1
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Vascular reconstruction
Assignee: Biosense Webster Inc
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Filing: 1999-10-01
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Granted: 2003-04-08
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Expires: 2019-10-01
Abstract
Abstract A method for vascular reconstruction comprises the steps of advancing a catheter having a position sensor into the vessel, acquiring position information from the sensor at a plurality of points in the vessel, calculating a center-line of the vessel based on said position information, and calculating the inner surface of the vessel. The method of the invention preferably further comprises displaying the vessel reconstruction. The invention is also directed to apparatus for reconstructing vessels which comprises a catheter having a position sensor contained therein, means for acquiring position information from said sensor at a plurality of points in said vessel, means for calculating a centerline of the vessel based on said position information, and means for calculating the inner surface of the vessel.
Inventors
- 👤 Daniel Reisfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:18
CPC Classifications
A; A61; A61B; A61B1/00; A61B5/00; A61B5/06; A61B5/061; A61B5/062
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
90 words
A method of reconstructing the inner surface of a blood vessel using a catheter having a position sensor contained therein, said sensor generating signals responsive to the position and/or the orientation of the catheter within the body, said method comprising: a) advancing the catheter into the vessel; b) acquiring signals from the sensor and calculating position information from said acquired signals at a plurality of acquisition points in the vessel; c) calculating a centerline of the vessel based on said position information; d) calculating the inner surface of the vessel.
Claim 2
Independent Claim
90 words
A method of reconstructing the inner surface of a blood vessel using a catheter having a position sensor contained therein, said sensor generating signals responsive to the position and/or the orientation of the catheter within the body, said method comprising: a) advancing the catheter into the vessel; b) acquiring signals from the sensor and calculating position information from said acquired signals at a plurality of acquisition points in the vessel; c) calculating a centerline of the vessel based on said position information; d) calculating the inner surface of the vessel.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the centerline is described as a parametric function.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the parametric function is of a polynomial form.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the distances between acquisition points and respective points on the centerline closest to said acquisition points are minimized.
Claim 6
Dependent Claim
15 words
The method of claim 4 wherein said distances are minimized in a least squares sense.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein said inner vessel surface is reconstructed in approximately circular cross-section.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein said reconstruction comprises calculating slices of the vessel about said centerline.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein said slices are perpendicular to said centerline.
Claim 10
Dependent Claim
16 words
The method of claim 8 wherein said slices perpendicular to said centerline have a fixed cross-section.
Claim 11
Dependent Claim
16 words
The method of claim 8 wherein said slices perpendicular to said centerline have a variable cross-section.
Claim 12
Dependent Claim
30 words
The method of claim 1 wherein the distance from each point on the reconstruction to the centerline is a function of the distances of the acquisition points to the centerline.
Claim 13
Dependent Claim
28 words
The method of claim 11 wherein the distance from each point on the reconstruction to the centerline is the average distance of the acquisition points to the centerline.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein the distance from each point on the reconstruction to the centerline is the median distance of the acquisition points to the centerline.
Claim 15
Dependent Claim
22 words
The method of claim 11 wherein said function is a weighted average of the distances of the acquisition points to the centerline.
Claim 16
Dependent Claim
16 words
The method of claim 14 wherein said weighted average accords greater weight to proximate acquisition points.
Claim 17
Dependent Claim
11 words
The method of claim 11 wherein said distance is user selected.
Claim 18
Dependent Claim
15 words
The method of claim 1 which further comprises acquiring condition information at said acquisition points.
Claim 19
Dependent Claim
17 words
The method of claim 17 wherein said reconstruction is color-coded to depict values of said condition information.
Claim 20
Dependent Claim
20 words
The method of claim 17 wherein values of condition information on the vessel surface intermediate said acquisition points are interpolated.
Claim 21
Dependent Claim
16 words
The method of claim 1 which further comprises the step of displaying the reconstructed vessel surface.
Claim 22
Dependent Claim
18 words
The method of claim 1 wherein said position information is obtained by traversing the catheter in the vessel.
Claim 23
Dependent Claim
22 words
The method of claim 1 wherein said position information is obtained by sampling points on the vessel wall around the vessel cross-section.
Claim 24
Dependent Claim
13 words
The method of claim 1 wherein said position sensor is an electromagnetic sensor.
Claim 25
Dependent Claim
86 words
Apparatus for reconstructing the inner surface of a blood vessel comprising: a) catheter having a position sensor contained therein, said sensor generating signals responsive to the position and/or the orientation of the catheter within the body; b) means for acquiring signals from said sensor at a plurality of points in said vessel and for calculating position information from said acquired signals; c) means for calculating a centerline of the vessel based on said position information; and d) means for calculating the inner surface of the vessel.
Claim 26
Dependent Claim
86 words
Apparatus for reconstructing the inner surface of a blood vessel comprising: a) catheter having a position sensor contained therein, said sensor generating signals responsive to the position and/or the orientation of the catheter within the body; b) means for acquiring signals from said sensor at a plurality of points in said vessel and for calculating position information from said acquired signals; c) means for calculating a centerline of the vessel based on said position information; and d) means for calculating the inner surface of the vessel.
Claim 27
Dependent Claim
13 words
The apparatus of claim 24 which further comprises means for displaying the reconstruction.
Claim 28
Dependent Claim
12 words
The apparatus of claim 24 wherein said sensor is an electromagnetic sensor.
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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) | 2006-04-07 | 2006-10-07 | 2007-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-07 | 2010-10-07 | 2011-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-07 | 2014-10-07 | 2015-04-08 | $7700.00 | Window Closed / Lapsed |