Method and apparatus for controlling blood volume and hydration and for indicating resuscitation status of a patient using peripheral venous pressure as a hemodynamic parameter
First Claim
1. An apparatus for measuring mean systemic pressure in a patient, comprising:
- a fluid source;
a fluid conduit for carrying fluid from said fluid source to the patient;
a pump for pumping fluid from said fluid source into the patient through said fluid conduit;
a pressure sensing transducer coupled with said fluid conduit for measuring fluid pressure in said fluid conduit and providing a measured fluid pressure signal indicative thereof; and
control means for controlling said pump and for controlling fluid communication through said fluid conduit so that the measured fluid pressure signal provided by said pressure sensing transducer is indicative of the mean systemic pressure of the patient.
1 Assignment
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Accused Products
Abstract
An apparatus for controlling fluid volume in a patient includes a fluid source (16) and a fluid conduit (32, 34, 36) for carrying fluid from the fluid source to the patient (12). A controllable infusion pump (30) pumps fluid from the fluid source to a peripheral vein of the patient through the fluid conduit. An occluder (100) for blocks fluid communication between the fluid source and the patient through the fluid conduit. A fluid pressure sensor (80) periodically senses fluid pressure in the fluid conduit. The apparatus further includes a controller (86) for determining a peripheral venous pressure value from the sensed fluid pressure in the fluid conduit after the infusion pump is stopped and the occluder blocks the fluid communication between the fluid source and the patient through the fluid conduit. The peripheral venous pressure is indicative of the patient'"'"'s means systemic pressure and the fluid volume of the patient.
97 Citations
42 Claims
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1. An apparatus for measuring mean systemic pressure in a patient, comprising:
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a fluid source;
a fluid conduit for carrying fluid from said fluid source to the patient;
a pump for pumping fluid from said fluid source into the patient through said fluid conduit;
a pressure sensing transducer coupled with said fluid conduit for measuring fluid pressure in said fluid conduit and providing a measured fluid pressure signal indicative thereof; and
control means for controlling said pump and for controlling fluid communication through said fluid conduit so that the measured fluid pressure signal provided by said pressure sensing transducer is indicative of the mean systemic pressure of the patient. - View Dependent Claims (2, 3, 4)
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5. An apparatus for measuring peripheral venous pressure in a patient, comprising:
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a fluid source;
a fluid conduit for carrying fluid from said fluid source to the patient;
a pump for pumping fluid from said fluid source into the patient through said fluid conduit; and
a pressure sensing transducer coupled with said fluid conduit for measuring fluid pressure in said fluid conduit and providing a measured fluid pressure signal indicative thereof; and
control means for controlling said pump and for controlling fluid communication through said fluid conduit so that the measured fluid pressure signal provided by said pressure sensing transducer is indicative of the peripheral venous pressure of the patient. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
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a fluid source;
an electrically controlled pump for pumping fluid from said fluid source through a fluid conduit into a patient;
a pressure sensing transducer for measuring a mean systemic pressure of the patient and providing a means systemic pressure signal indicative thereof; and
control means for automatically controlling said pump in response to said means systemic pressure signal indicative of the measured mean systemic pressure of the patient. - View Dependent Claims (13, 14, 15)
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16. An apparatus comprising:
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a fluid source;
an electrically controlled pump for pumping fluid from said fluid source through a fluid conduit to a patient;
a pressure sensing transducer for measuring peripheral venous pressure of the patient and providing a peripheral venous pressure signal indicative thereof; and
control means for automatically controlling said pump in response to said peripheral venous pressure signal indicative of the measured peripheral venous pressure of the patient. - View Dependent Claims (17, 18)
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19. An apparatus for controlling fluid volume in a patient comprising:
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a fluid source;
a fluid conduit for carrying fluid from said fluid source to the patient;
a controllable infusion pump for pumping fluid from said fluid source to a peripheral vein of the patient through said fluid conduit;
controllable occluder for, when actuated, blocking fluid communication between said fluid source and the patient through said fluid conduit;
fluid pressure sensor for sensing fluid pressure in said fluid conduit; and
controller for controlling operation of said infusion pump and said occluder and for determining a peripheral venous pressure value from said sensed fluid pressure in said fluid conduit after said infusion pump is stopped by said controller and said controller actuates said occluder to block said fluid communication between said fluid source and the patient through said fluid conduit, said peripheral venous pressure being indicative of fluid volume of the patient. - View Dependent Claims (20, 21, 22)
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23. An apparatus for controlling fluid volume in a patient comprising:
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a fluid source;
a controllable infusion pump connected to said fluid source through a fluid inlet line;
a catheter inserted in a peripheral vein of a patient and connected to an outlet of said infusion pump through a fluid outlet line so as to provide a fluid communication path between the peripheral vein of the patient and said pump, activation of said pump resulting in fluid being delivered to the patient from said fluid source through said catheter;
an in-line pressure sensing transducer positioned substantially at a heart level of the patient for sensing pressure in the fluid communication path and providing a pressure measurement signal indicative thereof;
an actuatable in-line occluder for isolating said fluid source from the patient when the occluder is actuated;
control means for periodically stopping said infusion pump, actuating said occluder, monitoring said pressure measurement signal, and determining a peripheral venous pressure value of the patient in response thereto; and
means for adjusting operation of said infusion pump in response to the determined peripheral venous pressure value. - View Dependent Claims (24, 25, 26)
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27. A method for measuring mean systemic pressure in a patient, comprising the steps of:
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connecting a fluid source to the patient through a fluid conduit;
pumping fluid from the fluid source into the patient through the fluid conduit; and
measuring fluid pressure using a pressure sensing transducer coupled to the fluid conduit by controlling the pumping and the flow of fluid from the fluid source to the patient so that the measured pressure with the pressure sensing transducer is indicative of the mean systemic pressure of the patient. - View Dependent Claims (28, 29, 30)
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31. A method for measuring peripheral venous pressure in a patient, comprising the steps of:
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connecting a fluid source to the patient through a fluid conduit;
pumping fluid from the fluid source into the patient through the fluid conduit; and
measuring fluid pressure using a pressure sensing transducer coupled to the fluid conduit by controlling the pumping and the flow of fluid from the fluid source to the patient so that the measured fluid pressure with the pressure sensing transducer is indicative of the peripheral venous pressure of the patient. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A method for controlling fluid volume in a patient comprising the steps of:
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connecting a fluid source to the patient through a fluid conduit;
periodically pumping fluid with an infusion pump from the fluid source to a vein of the patient through the fluid conduit;
periodically occluding fluid communication between the fluid source and the patient through the fluid conduit;
periodically sensing fluid pressure in the fluid conduit with a pressure sensing transducer;
monitoring the sensed fluid pressure in the fluid conduit after the step of pumping stops, and the step of occluding blocks the fluid communication between the fluid source and the patient through the fluid conduit;
providing an electronic signal indicative of the monitored fluid pressure, the monitored fluid pressure being indicative of fluid volume of the patient; and
controlling said pumping step in response to the electronic signal indicative of the monitored fluid pressure so as to control the fluid volume in the patient. - View Dependent Claims (39, 40)
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41. A method comprising the steps of:
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pumping fluid from a fluid source into a patient;
measuring a value functionally related to mean systemic pressure of the patient; and
controlling said pumping in response to said measured value functionally related to mean systemic pressure of the patient.
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42. A method comprising the steps of:
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pumping fluid from a fluid source to a patient;
measuring peripheral venous pressure of the patient; and
controlling said pumping in response to said measured peripheral venous pressure of the patient.
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Specification