Method and apparatus for vein fluid removal in heart failure
AssigneeCHF Solutions, Inc.
InventorsHoward R. Levin, Mark Gelfand, John O'Mahony, Hans-Dietrich Polaschegg
Life of this patent
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Abstract
A method and apparatus for ultrafiltration of blood operating by removing blood from a peripheral blood vessel at a rate of less than two percent of total cardiac output of a patient, extracting fluid at a rate of 0.1 liter to 1.0 liters per hour while retaining cells and proteins in the blood, and returning the concentrated blood to a secondary blood vessel is disclosed. Blood is removed and returned using small gage needles. As a pump circulates blood from the patient, a filter removes ultrafiltrate from the blood using duty cycle or pump control, and a transparent container collects the removed fluid.
Claims44
A method for removing excess fluid from a patient comprising:
- a. inserting a withdrawal catheter into a first peripheral blood vessel in the patient;
- b. withdrawing blood through the catheter in the first peripheral blood vessel in the patient;
- c. sensing a withdrawal pressure of the blood;
- d. adjusting a withdrawal blood flow rate based on the sensed withdrawal pressure;
- e. filtering the withdrawn blood through a filter to separate the excess fluid from the blood, wherein the filter has a filter membrane surface area of no greater than 0.2 m2;
- f. infusing the filtered blood into a second peripheral blood vessel in the patient;
- g. wherein a blood flow through the filter is less than two percent of a total cardiac output of the patient, and a flow of the excess fluid removed from the blood is no greater than 1.0 liters per hour.
A method for removing excess fluid from a patient comprising:
- a. withdrawing blood from a catheter inserted into a first blood vessel of the patient;
- b. monitoring a pressure of the blood being withdrawn and controlling a blood withdrawal rate based on the monitored pressure;
- c. condensing the withdrawn blood through a filter to separate the excess water from the blood, wherein the filter has filter membrane surface area of no greater than 0.2 m2;
- d. returning the condensed blood into a second blood vessel in the patient;
- e. wherein a blood flow through the filter is less than two percent of a total cardiac output of the patient, and a flow of the excess fluid removed from the blood is no greater than 1.0 liters per hour.
Dependencies are inferred from the claim text.