| US 7,473,371 B2 | ||
| Measurement of a blood flow rate in hemodialysis shunts | ||
| Nikolai M. Krivitski, Ithaca, N.Y. (US); and David R. MacGibbon, Ithaca, N.Y. (US) | ||
| Assigned to Transonic Systems, Inc., Ithaca, N.Y. (US) | ||
| Filed on Apr. 13, 2005, as Appl. No. 11/104,947. | ||
| Application 11/104947 is a division of application No. 10/871319, filed on Jun. 18, 2004, granted, now 7,297,280. | ||
| Application 10/355944 is a division of application No. 09/734352, filed on Dec. 11, 2000, granted, now 6,514,419, filed on Feb. 04, 2003. | ||
| Application 10/871319 is a continuation of application No. 10/355944, filed on Jan. 31, 2003, granted, now 6,926,838. | ||
| Application 09/734352 is a continuation of application No. 09/348130, filed on Jul. 02, 1999, granted, now 6,210,591, filed on Apr. 03, 2001. | ||
| Application 09/348130 is a continuation of application No. 09/010697, filed on Jan. 22, 1998, granted, now 6,153,109, filed on Nov. 28, 2000. | ||
| Application 09/010697 is a continuation in part of application No. 08/965975, filed on Nov. 07, 1997, abandoned. | ||
| Application 08/965975 is a continuation of application No. 08/305953, filed on Sep. 16, 1994, granted, now 5,685,989, filed on Nov. 11, 1997. | ||
| Prior Publication US 2005/0178732 A1, Aug. 18, 2005 | ||
| Int. Cl. A61B 5/026 (2006.01); A61B 5/0275 (2006.01); A61B 8/06 (2006.01) | ||
| U.S. Cl. 210—739 [210/745; 73/861; 73/861.05; 73/861.07] | 44 Claims |
| 1. A method for obtaining a measure of blood flow rate in a patient arterio-venous shunt, the arterio-venous shunt being connected
to an extracorporeal blood circulating system, the extracorporeal blood circulating system having a dialyzer connected to
the arterio-venous shunt by a first and a second line, wherein the first line directs blood from the arterio-venous shunt
to the dialyzer and the second line directs blood from the dialyzer to the arterio-venous shunt, the method comprising the
steps of:
(a) connecting the dialyzer to the arterio-venous shunt with an inlet of the first line located downstream from an outlet
of the second line;
(b) providing a change in a parameter of the blood flowing in the extracorporeal blood circulating system; and
(c) obtaining the measure of blood flow rate in the arterio-venous shunt based upon a resulting dilution curve by the change
in said parameter of the blood and a dialyzer blood flow rate.
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