Method and apparatus for ultrafiltration utilizing a long peripheral access venous cannula for blood withdrawal
First Claim
1. A method of withdrawal and return of blood in a patient undergoing extracorporeal blood treatment therapy comprising:
- a. inserting a blood withdrawal catheter into a surface peripheral vein in the patient'"'"'s arm;
b. advancing the catheter into a venous tree of the patient towards the heart a distance in a range of 20 to 65 cm;
c. continuously drawing blood from the catheter;
d. applying an extracorporeal treatment to the blood, and e. returning the treated blood to the patient.
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Accused Products
Abstract
Method and apparatus for the extracorporeal treatment of blood by utilizing a peripherally inserted catheter assembly for the continuous removal of blood for renal replacement treatment, in particularly, treatment of congestive heart failure and fluid overload by ultrafiltration. A catheter is inserted in a peripheral vein and maneuvered upward through the vascular system to access the reservoir of blood in the large or great veins for continuous blood withdrawal and treatment. Air-tight connectors are incorporated in the catheter assembly to overcome the untoward effects of negative pressure in blood withdrawal.
36 Citations
52 Claims
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1. A method of withdrawal and return of blood in a patient undergoing extracorporeal blood treatment therapy comprising:
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a. inserting a blood withdrawal catheter into a surface peripheral vein in the patient'"'"'s arm;
b. advancing the catheter into a venous tree of the patient towards the heart a distance in a range of 20 to 65 cm;
c. continuously drawing blood from the catheter;
d. applying an extracorporeal treatment to the blood, and e. returning the treated blood to the patient.
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2. A method as in 1 where the treatment is ultrafiltration.
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3. A method as in 1 where the treatment is hemofiltration.
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4. A method as in 1 where the treatment is dialysis.
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5. A method as in 1 where the treatment is selected from a group consisting of collecting platelet, collecting peripheral blood stem cells and performing a therapeutic apheresis procedure.
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6. A method of extracorporeal circulation of blood for medical therapy treatment therapy comprising:
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a. inserting a blood withdrawal catheter into a surface peripheral vein in an arm of a patient;
b. advancing the catheter into a venous tree of the patient and towards a heart until the catheter tip at least reaches an auxiliary vein;
c. drawing blood from the tip of the catheter;
d. applying extracorporeal treatment to the blood, and e. returning the treated blood to the patient. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of continuous extracorporeal circulation of blood for medical treatment therapy comprising:
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a. inserting a blood withdrawal catheter into a surface peripheral vein in an extremity of the patient;
b. advancing the catheter into a venous tree of the patient and towards a heart of the patient until a catheter tip has substantially passed venous valves in the venous tree;
c. withdrawing blood from the tip of a catheter in a retrograde flow direction;
d. applying extracorporeal treatment to the withdrawn blood;
e. returning blood to the patient. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for removing excess water from a patient comprising the steps of:
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a. inserting a blood withdrawal catheter in a peripheral vein and maneuvering the catheter through the vein and vascular system of the patient to access a reservoir of blood in the large or great veins for continuous blood withdrawal;
b. drawing blood from the reservoir of blood into the withdrawal catheter and into a withdrawal blood tube of an extracorporeal blood circuit;
c. applying a reduced pressure to the withdrawal blood tube to cause blood to flow into the blood withdrawal catheter. d. condensing the removed blood through a filter to separate the excess water from the blood;
e. returning the condensed blood into a second peripheral blood vessel in the patient, and f. 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 in a range of 0.1 to 1.0 liters per hour. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A fluid removal apparatus comprising:
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a blood removal catheter for insertion into a peripheral vein and having a size 16 standard gage needle or less, wherein the blood removal catheter has a length in a range of 20 to 65 cm;
a pump connected between the blood removal catheter and the filter;
a filter having a blood inlet port coupled to the blood removal catheter, a blood outlet port, an excess fluid removal port, and a blood flow passage with porous membrane which passes fluids to the fluid removal port and retains solutes of 50,000 Daltons or greater, and a blood return catheter for inserting into a peripheral vein or artery and having a size of 16 standard gage needle or less. - View Dependent Claims (37, 38, 39, 40, 41)
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42. An apparatus for removing excess fluid from a patient comprising:
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a blood removal catheter for insertion into a first peripheral vein of the patient, wherein the blood removal catheter is a long peripheral venous access cannula;
a filter having a blood inlet port in fluid communication with the blood removal catheter to receive blood removed directly from the first peripheral vein or artery, a blood outlet port, an excess fluid removal port, and a filter membrane between the fluid removal port and the blood inlet and outlet ports, wherein the filter membrane is sized to pass excess fluid from blood flowing through the filter at a rate in a range of 100 milliliters per hour (mL/hour) to 700 mL/hour, and a blood return catheter in fluid communication with the blood outlet port and for inserting into a second peripheral vein or artery of the patient. - View Dependent Claims (43, 44, 45, 46, 47)
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48. A catheter for insertion into a peripheral vein of a patient for continuous withdrawal of blood as a part of extracorporeal blood circulation circuit where said catheter is:
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a. 20 to 65 cm long;
b. has internal lumen of 0.9 to 1.2 mm in diameter;
c. includes an air tight connector for connection to blood withdrawal tubing with a compression seal. - View Dependent Claims (49, 50, 51)
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52. An extracorporeal method for treating blood from a patient comprising the steps of:
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a. inserting a blood withdrawal catheter in a peripheral vein and maneuvering the catheter through the vein of the patient to access a reservoir of blood in the large or great veins for continuous blood withdrawal;
b. continuously drawing blood from the reservoir of blood into the withdrawal catheter and into a withdrawal blood tube of an extracorporeal blood circuit, and c. applying a reduced pressure to the withdrawal blood tube to cause blood to flow into the blood withdrawal catheter.
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Specification