Central venous catheter assembly for measuring physiological data for cardiac output determination and method of determining cardiac output
First Claim
1. A central venous sensor assembly for measuring physiological data for cardiac output determination, said measurement assembly comprising:
- a distal intravascular portion for placement in the vena cava inferior of a patient and a proximal intravascular portion for placement in the vena cava superior of the patient,a distal flux measurement unit arranged in the distal intravascular portion and adapted to provide raw measurement data for determination of a blood flow in the direction towards the proximal intravascular portion, anda proximal flux measurement unit arranged in the proximal intravascular portion and adapted to provide raw measurement data for determination of a blood flow in the direction towards the distal intravascular portion,wherein the venous sensor assembly is connected to an evaluation unit comprising a first input channel for receiving raw measurement data from said distal flux measurement unit and a second input channel for receiving raw measurement data from said proximal flux measurement unit and being adapted to;
determine a first blood flow from the raw measurement data received from said distal flux measurement unit,determine a second blood flow from the raw measurement data received from said proximal flux measurement unit, anddetermine said cardiac output as a sum of said first blood flow and said second blood flow.
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Accused Products
Abstract
The central venous sensor assembly comprises a catheter body with several proximal ports. The catheter portion placed in the vena cava superior is equipped with a proximal flux measurement unit, and the catheter portion placed in the vena cava inferior is equipped with a distal flux measurement unit. A first input channel supplies a measurement signal indicative of a flux vp to the evaluation unit from which the latter calculates a blood flow in the vena cava superior. Likewise, a second input channel supplies a measurement signal indicative of a flux vd to the evaluation unit from which the latter calculates a blood flow rate in the vena cava inferior. Due to continuity, the sum of the flow rates in the upper and lower central veins corresponds to the flow rate through the right heart and in the pulmonary artery and thus to cardiac output.
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Citations
22 Claims
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1. A central venous sensor assembly for measuring physiological data for cardiac output determination, said measurement assembly comprising:
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a distal intravascular portion for placement in the vena cava inferior of a patient and a proximal intravascular portion for placement in the vena cava superior of the patient, a distal flux measurement unit arranged in the distal intravascular portion and adapted to provide raw measurement data for determination of a blood flow in the direction towards the proximal intravascular portion, and a proximal flux measurement unit arranged in the proximal intravascular portion and adapted to provide raw measurement data for determination of a blood flow in the direction towards the distal intravascular portion, wherein the venous sensor assembly is connected to an evaluation unit comprising a first input channel for receiving raw measurement data from said distal flux measurement unit and a second input channel for receiving raw measurement data from said proximal flux measurement unit and being adapted to; determine a first blood flow from the raw measurement data received from said distal flux measurement unit, determine a second blood flow from the raw measurement data received from said proximal flux measurement unit, and determine said cardiac output as a sum of said first blood flow and said second blood flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for determining cardiac output of a patient comprising the steps of:
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receiving raw measurement data from a first flux measurement unit which measures flux-related raw measurement data in the vena cava inferior, receiving raw measurement data from a second flux measurement unit which measures flux-related raw measurement data in the vena cava superior, determining a first blood flow from the raw measurement data received from said first flux measurement unit, determining a second blood flow from the raw measurement data received from said second flux measurement unit, and determining said cardiac output as a sum of said first blood flow and said second blood flow. - View Dependent Claims (20, 21, 22)
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Specification