US6398738B1
Expired / Lapsed
US
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Method and apparatus for reconstructing a high fidelity pressure waveform with a balloon catheter
Assignee: Millar Instruments Inc
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Filing: 2000-09-25
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Granted: 2002-06-04
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Expires: 2020-09-25
Abstract
Abstract The invention provides a method and system for reconstructing a high-fidelity pressure waveform with a balloon catheter used in a heart. First, a balloon catheter having an air line is inserted into the aorta of the heart. The air line is then closed and sufficient air is introduced in order to equalize the pressure in the balloon catheter and the aorta. The AC components of the aortic pressure and the mean aortic pressure are detected separately and then added to form a high-fidelity pressure waveform. The high fidelity pressure waveform may be displayed on an oscilloscope, a patient monitor, or other suitable display.
Inventors
- 👤 Huntly D. Millar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:04
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6852; A61B5/6853; A61B5/02; A61B5/021; A61B5/02108; A61B5/0215; A61B5/6851
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
111 words
A system for reconstructing a high-fidelity waveform of the blood pressure in the aorta of a human body, comprising: a catheter body having a distal end and a proximal end; a support surface proximate the distal end of the catheter body; an inflatable balloon surrounding at least a portion of the catheter body; a pressure sensor supported by the support surface; a capacitively coupled detection circuit operatively coupled to the pressure sensor for removing DC bias and detecting frequency changes occurring at the pressure sensor; and an external pressure transducer located at the proximal end of the catheter body and operatively coupled for determining the mean pressure within the inflatable balloon.
Claim 2
Independent Claim
111 words
A system for reconstructing a high-fidelity waveform of the blood pressure in the aorta of a human body, comprising: a catheter body having a distal end and a proximal end; a support surface proximate the distal end of the catheter body; an inflatable balloon surrounding at least a portion of the catheter body; a pressure sensor supported by the support surface; a capacitively coupled detection circuit operatively coupled to the pressure sensor for removing DC bias and detecting frequency changes occurring at the pressure sensor; and an external pressure transducer located at the proximal end of the catheter body and operatively coupled for determining the mean pressure within the inflatable balloon.
Claim 3
Dependent Claim
34 words
The system of claim 1 , further comprising a patient monitor for reconstructing the high-fidelity waveform by adding the output of the capacitively coupled detection circuit and the output of the external pressure transducer.
Claim 4
Dependent Claim
33 words
The system of claim 1 , further comprising an oscilloscope for reconstructing the high-fidelity waveform by adding the output of the capacitively coupled detection circuit and the output of the external pressure transducer.
Claim 5
Dependent Claim
28 words
The system of claim 1 , further comprising a computer for adding the output of the capacitively coupled detection circuit and the output of the external pressure transducer.
Claim 6
Dependent Claim
13 words
The system of claim 1 , wherein the external pressure transducer is disposable.
Claim 7
Dependent Claim
13 words
The system of claim 1 , wherein the external pressure transducer is reusable.
Claim 8
Dependent Claim
27 words
The system of claim 1 , wherein the capacitively coupled detection circuit is operable to detect frequency changes corresponding to the dicrotic notch in the aortic pressure.
Claim 9
Independent Claim
109 words
A method for reconstructing a high-fidelity pressure waveform with a balloon catheter used in a heart, comprising: inserting a balloon catheter having an air line into the aorta of the heart; closing the airline; inserting air in the air line to equalize the pressure in the balloon catheter and the aorta; sensing the aortic pressure changes at the tip of the balloon catheter; detecting the AC component of the measured aortic pressure changes; detecting the pressure in the air line in order to determine the mean aortic pressure; and adding the AC component of the measured aortic pressure to the mean aortic pressure to form a high-fidelity pressure waveform.
Claim 10
Independent Claim
109 words
A method for reconstructing a high-fidelity pressure waveform with a balloon catheter used in a heart, comprising: inserting a balloon catheter having an air line into the aorta of the heart; closing the airline; inserting air in the air line to equalize the pressure in the balloon catheter and the aorta; sensing the aortic pressure changes at the tip of the balloon catheter; detecting the AC component of the measured aortic pressure changes; detecting the pressure in the air line in order to determine the mean aortic pressure; and adding the AC component of the measured aortic pressure to the mean aortic pressure to form a high-fidelity pressure waveform.
Claim 11
Dependent Claim
24 words
The method of claim 8 , wherein the step of detecting the pressure in the air line is performed using a disposable pressure sensor.
Claim 12
Dependent Claim
20 words
The method of claim 8 , wherein the amount of air inserted in the air line is approximately 5 cc's.
Claim 13
Dependent Claim
16 words
The method of claim 8 , further comprising displaying the high-fidelity pressure waveform on an oscilloscope.
Claim 14
Dependent Claim
17 words
The method of claim 8 , further comprising displaying the high-fidelity pressure waveform on a patient monitor.
Claim 15
Dependent Claim
35 words
The method of claim 8 , further comprising: detecting the dicrotic notch of the AC component of the measured aortic pressure changes; and inflating the balloon catheter based on the location of the dicrotic notch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-03 | 2005-12-03 | 2006-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-03 | 2009-12-03 | 2010-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-03 | 2013-12-03 | 2014-06-04 | $7700.00 | Window Closed / Lapsed |