Method and device for monitoring an extracorporeal blood circuit

A technology of extracorporeal blood circuit and extracorporeal circuit, which is applied in the direction of blood circulation processing, suction equipment, etc., and can solve problems such as undetectable error states

Active Publication Date: 2009-07-22
FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In contrast, based on only a single measurement of arterial and venous pressure at a certain time, possible error conditions cannot be detected using known algorithms

Method used

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  • Method and device for monitoring an extracorporeal blood circuit
  • Method and device for monitoring an extracorporeal blood circuit
  • Method and device for monitoring an extracorporeal blood circuit

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Embodiment Construction

[0034] The arterial and venous pressures measured in the arterial and venous branches of the extracorporeal blood circuit include in each case the dynamic pressure in the extracorporeal circuit and the dynamic pressure in the patient's vascular access generated by the flow of the blood pump .

[0035] The dynamic pressure in the extracorporeal circuit is a function of the extracorporeal blood flow and the sum of the resistance to flow in the extracorporeal circuit. The arterial flow resistance and the venous flow resistance are different because of the different geometries of the parts through which the blood flows, so the sum of the arterial and venous pressures (hereinafter, referred to as Ps) is likewise a function of the blood flow. In known blood purification methods, the delivery rate Q of the blood pump B Usually set to a fixed value. Therefore, when the viscosity of the blood is constant, the sum of the flow resistances in the extracorporeal circuit is also constant....

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Abstract

To monitor an extracorporeal blood circuit during an extracorporeal blood treatment, the arterial pressure and venous pressure in the arterial branch and venous branch of the extracorporeal circuit are measured by means of pressure sensors (18, 19), and the sum Ps and the difference deltaP of the arterial pressure and / or venous pressure measured at the same time are formed. A possible error state is indicated when the sum Ps and / or difference deltaP lie outside predetermined limit value windows A and B. To reduce the susceptibility to error, a check is preferably also made to ascertain whether the two above conditions are satisfied for n successive measurements.

Description

technical field [0001] The invention relates to a method for monitoring an extracorporeal blood circuit during extracorporeal blood treatment, in particular during chronic blood purification therapy, for example during hemodialysis, hemofiltration (haemofiltration) or hemodiafiltration (haemodiafiltration), and has Devices for monitoring extracorporeal blood circuits and for extracorporeal blood treatment, in particular hemodialysis, hemofiltration or hemodiafiltration. Background technique [0002] In known methods of chronic blood purification therapy such as hemodialysis, hemofiltration or hemodiafiltration, the patient's blood is passed through an extracorporeal blood circuit, usually equipped with a safety system that permanently monitors the arterial pressure and venous pressure within the circuit. pressure. The purpose of monitoring the pressure is to detect various complications that may arise during extracorporeal blood treatment. Possible management complications...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M1/36
CPCA61M1/3653A61M1/3639A61M1/3656A61M1/3661
Inventor W·克莱内考夫特
Owner FRESENIUS MEDICAL CARE DEUTSCHLAND GMBH
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