Method and apparatus for an extracorporeal treatment device to control blood withdrawal and infusion
First Claim
1. A method for controlling blood flow through an extracorporeal blood circuit having a controller comprising the steps of:
- a. withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, treating the blood in the circuit, and infusing the treated blood into the patient;
b. detecting an occlusion which at least partially blocks the withdrawal or infusion of the blood;
c. in response to the detection of the occlusion, the controller automatically prompts the patient to move to alleviate the occlusion, and d. in response to a prolonged occlusion, the controller issues an alarm.
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Accused Products
Abstract
A method and apparatus are disclosed for controlling blood flow through an extracorporeal blood circuit having a controller comprising the steps of: withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, treating the blood in the circuit and infusing the treated blood into the patient; detecting an occlusion which at least partially blocks the withdrawal or infusion of the blood; reducing the blood flow rate and the rate of filtration in response to the occlusion, and further prompting the patient to move his arm in an effort to alleviate the occlusion.
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Citations
38 Claims
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1. A method for controlling blood flow through an extracorporeal blood circuit having a controller comprising the steps of:
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a. withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, treating the blood in the circuit, and infusing the treated blood into the patient;
b. detecting an occlusion which at least partially blocks the withdrawal or infusion of the blood;
c. in response to the detection of the occlusion, the controller automatically prompts the patient to move to alleviate the occlusion, and d. in response to a prolonged occlusion, the controller issues an alarm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for controlling blood flow through an extracorporeal blood ultrafiltration circuit having a controller comprising the steps of:
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a. selecting a desired filtration rate for the ultrafiltration circuit to extract filtrate for an ultrafiltration treatment;
b. withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, filtering the blood to extract filtrates at the desired filtration rate, and infusing the filtered blood into the patient;
c. detecting a pressure of the blood being withdrawn or infused exceeding a predetermined threshold pressure value;
d. reducing a blood flow rate through the circuit in response to the detection of the pressure exceeding the threshold;
e. in connection with step (d), reducing a rate of filtrate extraction to a rate less than the desired filtration rate;
f. increasing the blood flow rate through the circuit after determining that the pressure of the blood being withdrawn or infused is within the threshold pressure value, and g. increasing the filtration rate after step (f). - View Dependent Claims (23, 24, 25)
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26. A method for controlling blood ultrafiltration of blood using an ultrafiltration blood circuit having a controller comprising the steps of:
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a. withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, filtering liquid ultrafiltrate from the blood in the circuit containing a blood filter and infusing the filtered blood into the patient;
b. detecting an occlusion which at least partially blocks the withdrawal or infusion of the blood;
c. in response to the detection of the occlusion controller automatically reducing blood flow and reducing ultrafiltrate flow through the circuit;
d. detecting an alleviation of the occlusion, and e. automatically increasing the blood flow and ultrafiltrate flow after the occlusion has been alleviated. - View Dependent Claims (27, 28, 29, 30)
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31. A method for controlling ultrafiltration in a blood circuit having withdrawal and infusion blood passages connected to a patient, a filter, a blood pump, and a filtrate pump, said method comprising the steps:
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a. withdrawing the blood from a withdrawal blood vessel in a patient into the blood circuit, filtering liquid ultrafiltrate from the blood in the filter, and infusing the filtered blood into the patient;
b. controlling a flow ultrafiltrate from the filter to maintain an ultrafiltrate flow pressure above a predetermined pressure value;
c. in response to a reduction of blood flow through the blood circuit, reducing the flow of ultrafiltrate to a flow. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification