| US 7,462,161 B2 | ||
| Method and apparatus for blood withdrawal and infusion using a pressure controller | ||
| John O'Mahony, Barna (Ireland); Mark Gelfand, New York, N.Y. (US); and Edward G. Rychlick, Riverdale, N.Y. (US) | ||
| Assigned to CHF Solutions, Inc., Brooklyn Park, Minn. (US) | ||
| Filed on Jun. 17, 2005, as Appl. No. 11/154,569. | ||
| Application 10/601574 is a division of application No. 09/703702, filed on Nov. 02, 2000, granted, now 6,585,675. | ||
| Application 11/154569 is a continuation of application No. 10/601574, filed on Jun. 24, 2003. | ||
| Prior Publication US 2005/0230313 A1, Oct. 20, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A61M 37/00 (2006.01); C02F 1/44 (2006.01) | ||
| U.S. Cl. 604—6.09 [604/5.01; 604/6.11; 210/645; 210/741] | 12 Claims |
| 1. A method for controlling blood flow through an extracorporeal circuit coupled comprising:
a. continuously withdrawing the blood from a withdrawal blood vessel in a patient into the extracorporeal circuit, processing
the blood in the circuit, and infusing the processed blood into the patient in a continuous manner, wherein the withdrawal
and infusion are simultaneous;
b. detecting an occlusion which at least partially blocks the withdrawal of blood from the patient;
c. interrupting the continuous withdrawal of blood in step (a), and automatically and temporarily ceasing or reversing the
withdrawal of the blood after step (b),
d. waiting a predetermined period of time before resuming continuous withdrawal of blood;
e. after step (d), determining that a pressure in withdrawal tube of the circuit is below a predetermined limit, and
f. if the pressure is below the predetermined limit, resuming the continuous withdrawal of blood in step (a) to resume withdrawal
of the blood.
|