Method and apparatus for non-invasive monitoring of central venous pressure
First Claim
1. A method for measuring CVP comprising:
- disposing a transducer on the neck of a subject;
processing the signal from the transducer to obtain the cardiac component; and
adjusting the vertical distance from the transducer to a reference level until a position is located at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, at which position said vertical distance approximates CVP.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for measuring central venous pressure (CVP) is disclosed, along with an improved transducer (50) for measuring CVP in infants. Changes in CVP may also be monitored by employing the method and apparatus of the invention. According to the invention, a transducer is disposed on the neck of a subject (or on the head in the case of infants), and the signal from the transducer is processed to obtain the cardiac component. Thereafter, the vertical distance from the transducer to a reference level is adjusted until the position is located at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, at which position the vertical distance approximates CVP.
89 Citations
76 Claims
-
1. A method for measuring CVP comprising:
-
disposing a transducer on the neck of a subject; processing the signal from the transducer to obtain the cardiac component; and adjusting the vertical distance from the transducer to a reference level until a position is located at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, at which position said vertical distance approximates CVP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method for monitoring changes in CVP comprising:
-
disposing a transducer on the neck of a subject; processing the signal from the transducer to obtain the cardiac component; determining whether said signal initially depicts a (1) venous configuration or (2)arterial or mixed venous-arterial configuration; and monitoring said signal for a change from its initially depicted configuration to the other configuration, said monitored change being indicative of a change in CVP. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A method for measuring CVP in infants comprising:
-
disposing a transducer on the head of an infant; processing the signal from the transducer to obtain the cardiac component; and adjusting the vertical distance from the transducer to a reference level until a position is located at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, at which position said vertical distance approximates CVP. - View Dependent Claims (26, 27, 28, 29, 30, 31)
-
-
32. A method for monitoring changes in CVP in infants comprising:
-
disposing a transducer on the head of an infant; processing the signal from the transducer to obtain the cardiac component; determining whether said signal initially depicts a (1) venous configuration or (2) arterial or mixed venous-arterial configuration; and monitoring said signal for a change from its initially depicted configuration to the other configuration, said monitored change being indicative of a change in CVP. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39)
-
-
40. An apparatus for measuring CVP comprising:
-
a transducer disposed on the neck of a subject; means for processing the signal from the transducer to obtain the cardiac component; and means for measuring the vertical distance from the transducer to a reference level after the neck is adjusted to a position at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, said vertical distance approximating CVP. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
-
-
52. An apparatus for monitoring changes in CVP comprising:
-
transducer disposed on the neck of a subject; means for processing the signal from the transducer to obtain the cardiac component; means for determining whether said signal initially depicts a (1) venous configuration or (2) arterial or mixed venous-arterial configuration; and means for monitoring said signal for a change from its initially depicted configuration to the other configuration and for indicating a change in CVP in response to a monitored change. - View Dependent Claims (53, 54, 55, 57, 58, 59, 60, 61, 62)
-
-
56. The apparatus 52, wherein said means for processing comprises means for high pass filtering.
-
63. An apparatus for measuring CVP in infants comprising:
-
a transducer disposed on the head of an infant; means for processing the signal from the transducer to obtain the cardiac component; and means for measuring the vertical distance from the transducer to a reference level after a position is located at which the signal transitions between a venous configuration and an arterial or mixed venous-arterial configuration, at which position said vertical distance approximates CVP. - View Dependent Claims (64, 65, 66, 67, 68, 69)
-
-
70. An apparatus for monitoring changes in CVP in infants comprising:
-
a transducer disposed on the head of an infant; means for processing the signal from the transducer to obtain the cardiac component; means for determining whether said signal initially depicts a (1) venous configuration or (2) arterial or mixed venous-arterial configuration; and means for monitoring said signal for a change from its initially depicted configuration to the other configuration and for indicating a change in CVP in response to a monitored change. - View Dependent Claims (71, 72, 73, 74, 75, 76)
-
Specification