Method, system and apparatus for evaluating hemodynamic parameters
First Claim
1. Apparatus for evaluating the hemodynaric state of the cardiovascular system of the body of a patient, comprising:
- a pulmonary artery catheter having a distal end positionable within mixed venous blood at the pulmonary artery of said body and an indwelling region spaced rearwardly therefrom, said catheter extending to a proximal end;
a diffusion channel within said catheter having a gas input connectable with a controlled source of gas biocompatible with said body and extending to an infusion component located at said indwelling region and configured for infusing said gas into the bloodstream of said body; and
a gas sensor component mounted upon said catheter at said distal end and having an output corresponding with a level of said biocompatible gas within said mixed venous blood.
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Accused Products
Abstract
Method, system, and apparatus for evaluating hemodynamic parameters and, in particular, cardiac output. A pulmonary artery catheter is described which incorporates a diffuser of gas biocompatible with the body such as oxygen at an indwelling region such that the gas may be employed to carry out a dilution technique to measure cardiac output. A mixed venous blood gas level then is measured at the pulmonary artery using a gas sensor. The preferred gas sensor employs oximetry to derive values of mixed venous oxygen saturation. An alternate embodiment utilizes an electrode/electrolyte approach as the gas sensor to carry out measurement of dissolved oxygen in mixed venous blood. The system utilizes a microprocessor driven controller to develop multiple evaluations over sequential measurement intervals and to compute a variety of hemodynamic parameters including the noted cardiac output.
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Citations
41 Claims
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1. Apparatus for evaluating the hemodynaric state of the cardiovascular system of the body of a patient, comprising:
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a pulmonary artery catheter having a distal end positionable within mixed venous blood at the pulmonary artery of said body and an indwelling region spaced rearwardly therefrom, said catheter extending to a proximal end; a diffusion channel within said catheter having a gas input connectable with a controlled source of gas biocompatible with said body and extending to an infusion component located at said indwelling region and configured for infusing said gas into the bloodstream of said body; and a gas sensor component mounted upon said catheter at said distal end and having an output corresponding with a level of said biocompatible gas within said mixed venous blood. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. The method for evaluating the hemodynamic state of the cardiovascular system of the body of a patient, comprising the steps of:
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(a) providing a pulmonary artery catheter having a proximal end, a distal end and an indwelling region spaced rearwardly therefrom, a diffusion channel within said catheter having a gas input connectable with a source of gas biocompatible with said body and extending to an infusion component located at said indwelling region and configured for infusably conveying said gas into the bloodstream of said body, and a gas sensor component mounted upon said catheter at said distal end and having an output corresponding with a level of said biocompatible gas within blood at the location of said sensor; (b) positioning said pulmonary artery catheter within the bloodstream of said body, locating said sensor component at the pulmonary artery and said infusion component upstream therefrom; (c) deriving said output from said gas sensor to provide a baseline value corresponding with a level of said biocompatible gas within mixed venous blood; (d) delivering said gas from said source into said diffusion channel at a predetermined mass flow rate; (e) deriving said output from said gas sensor; and (f) deriving a value for the cardiac output of the heart of said body by correlating said baseline value, said predetermined mass flow rate and said output derived in step (e). - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for evaluating the hemodynamic state of the cardiovascular system of the body of a patient comprising:
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a source of gas biocompatible with said body; gas flow control apparatus coupled with said source of gas and controllable to provide a select mass flow rate of said gas at a gas output; a pulmonary artery catheter having a distal end positionable within mixed venous blood at the pulmonary artery of said body and an indwelling region located rearwardly therefrom, said catheter extending to a proximal end; a blood gas level sensor component mounted with said catheter at said distal end and controllable to provide a sensor output at said proximal end corresponding with a blood gas level within said mixed venous blood; a diffusion channel within said catheter having an input adjacent said proximal end connectable in gas flow communication with said gas output and having an infusion component located at said indwelling region for diffusing said gas with blood flowing adjacent thereto; a controller for controlling said gas flow control apparatus and said gas level sensor, and responsive to said sensor output for deriving a first output signal in correspondence therewith representing a value of cardiac output; and a display responsive to said first output signal for displaying said value of cardiac output. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification