Method and apparatus for reconstructing a high fidelity pressure waveform with a balloon catheter
First Claim
1. 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.
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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.
221 Citations
13 Claims
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1. A system for reconstructing a high-fidelity waveform of the blood pressure in the aorta of a human body, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for reconstructing a high-fidelity pressure waveform with a balloon catheter used in a heart, comprising:
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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. - View Dependent Claims (9, 10, 11, 12, 13)
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.
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Specification