Method and device for recognition of paravasal bleeding

Abstract

The invention relates to a method and to a device for recognition of paravasal bleeding upon a supplying of blood to a vascular access via a line and / or upon the removal of blood from a vascular access via a line, particularly paravasal bleeding during extra-corporeal blood treatment, such as for hemodialysis, hemofiltration or hemodiafiltration. The invention furthermore relates to a device for extra-corporeal blood treatment, particularly for hemodialysis, hemofiltration or hemodiafiltration, comprising a device for recognition of paravasal bleeding. The method according to the invention and the device according to the invention are based on the change of arterial pressure in the arterial branch (5) or the venous pressure in the venous branch (7) of the extra-corporeal circuit (I) being registered during the extra-corporeal blood treatment. If paravasal bleeding occurs during the blood treatment, it is shown that the positive dynamic pressure on the line leading to the vascular access rises on the venous cannula during the extra-corporeal blood treatment, or the suction pressure on the line leaving the vascular access, such as the arterial cannula during extra-corporeal blood treatment, rises; that is, the suction pressure becomes more negative. The pressure rise begins moderately at first and then becomes increasingly greater. Decisive for the method according to the invention and the device according to the invention, therefore, is that pressure changes that come from a pressure level exhibiting a large difference from the reference value find stronger consideration than those that come from a pressure level that exhibits only a minor difference from the reference value.

Description

technical field [0001] The present invention relates to a method and a device for identifying perivascular bleeding when transfusing blood into and / or withdrawing blood from a vascular access via a catheter, in particular when used for example in hemodialysis, hemofiltration or hemodialysis Perivascular bleeding that occurs during filtered extracorporeal blood processing. Furthermore, the invention relates to a device for extracorporeal blood treatment, in particular for hemodialysis, hemofiltration or hemodiafiltration, which is equipped with a device for detecting perivascular bleeding. Background technique [0002] Devices for transfusing and / or withdrawing blood from a vascular access through a catheter are generally known. These devices are characterized by the infusion of blood into or withdrawal of blood from a vascular access (eg, an artery or a vein) through a catheter. Such devices are known, for example, as infusion devices or blood transfusion devices. [0003...

AI Technical Summary

Problems solved by technology

The identification of perivascular hemorrhage is problematic in practice because perivascular hemorrhage itself only results in a very slow rise in pressure in the catheter leading to the needle or in the needle

When the pressure in the catheter or needle is still far below the pressure limit value used by known pressure monitoring devices, the only small pressure increase per time unit is initially unnoticeable, although there is a continuous More and more blood flows into the tissues and accumulates there, thereby injuring the patient more and more severely

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