Detection and correction of catheter line distortion in blood pressure measurements
First Claim
1. A blood pressure monitor for use with an invasive catheter system employing a fluid filled catheter having a first end communicating with a blood vessel of a patient and a second end received by a pressure transducer producing an electrical pressure signal indicating fluid pressure at the second end, the blood pressure monitor comprising:
- a first and second signal processor receiving the electrical pressure signal and providing different degrees of attenuation of predetermined resonance components of the electrical pressure signal;
a comparison circuit monitoring a divergence between outputs of the first and second signal processors and based on that divergence selecting one output as a corrected pressure output; and
a display outputting at least one blood pressure measurement to an operator based on the corrected pressure output.
1 Assignment
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Accused Products
Abstract
An invasive blood pressure monitor assesses likelihood of coloration of the pressure waveform by the fluid-filled catheter prior to imposing a correction on this pressure waveform. This detection may be made by comparing two alternate signal processing paths of the pressure waveform, one of which is intended to correct for coloration and applying the coloration correction only if those processing paths yield significantly different output values.
22 Citations
23 Claims
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1. A blood pressure monitor for use with an invasive catheter system employing a fluid filled catheter having a first end communicating with a blood vessel of a patient and a second end received by a pressure transducer producing an electrical pressure signal indicating fluid pressure at the second end, the blood pressure monitor comprising:
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a first and second signal processor receiving the electrical pressure signal and providing different degrees of attenuation of predetermined resonance components of the electrical pressure signal;
a comparison circuit monitoring a divergence between outputs of the first and second signal processors and based on that divergence selecting one output as a corrected pressure output; and
a display outputting at least one blood pressure measurement to an operator based on the corrected pressure output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A blood pressure monitor for use with an invasive catheter system employing a fluid filled catheter having a first end communicating with a blood vessel of a patient and a second end received by a pressure transducer producing an electrical pressure signal indicating fluid pressure at the second end, the blood pressure monitor comprising:
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a distortion detection circuit monitoring the electrical pressure signal to detect a likelihood of catheter induced distortion caused by mechanical resonance of the catheter system;
a correction filter processing the electrical pressure signal to reduce resonance harmonics only when the distortion detection circuit detects a likelihood of catheter induced distortion; and
a display outputting at least one blood pressure measurement to an operator based on the output of the correction filter.
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14. A method of evaluating blood pressure measurements obtained with an invasive catheter system employing a fluid filled catheter having a first end communicating with a blood vessel of a patient and a second end received by a pressure transducer producing an electrical pressure signal indicating fluid pressure at the second end, the method comprising the steps of:
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(a) filtering the electrical pressure signal with a first and second filter attenuating predetermined frequency components of the electrical pressure signal;
(b) comparing a divergence between outputs of the first and second filters and, based on that divergence, selecting one output as a corrected pressure output; and
(c) outputting at least one blood pressure measurement to an operator based on the corrected pressure output. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification