Apparatus and method for control of ultrafiltration in extracorporeal treatment of blood
First Claim
1. A method for controlling an ultrafiltration process for blood purification, which ultrafiltration process uses a central venous catheter for blood withdrawal, an extracorporeal circuit comprising a filter separated by a membrane into a blood side and a filtrate or dialysate side, a device for the removal of fluid from the filtrate or dialysate side which is controlled by a control unit, and at least one sensor for measuring the oxygen content in blood or filtrate or dialysate, said method comprising controlling the ultrafiltration as function of at least one parameter selected from the group oxygen concentration in blood or in filtrate or in dialysate.
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Abstract
An apparatus and method for alleviation of symptoms of inappropriate blood pressure and cramping from the removal of water during ultrafiltration hemodialysis and hemofiltration treatment. The invention uses oxygen concentration measured by sensors in various ways and at various points in the blood treatment circuitry to estimate parameters necessary to control the rate at which water is removed from the patient'"'"'s blood.
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23 Claims
- 1. A method for controlling an ultrafiltration process for blood purification, which ultrafiltration process uses a central venous catheter for blood withdrawal, an extracorporeal circuit comprising a filter separated by a membrane into a blood side and a filtrate or dialysate side, a device for the removal of fluid from the filtrate or dialysate side which is controlled by a control unit, and at least one sensor for measuring the oxygen content in blood or filtrate or dialysate, said method comprising controlling the ultrafiltration as function of at least one parameter selected from the group oxygen concentration in blood or in filtrate or in dialysate.
- 21. An apparatus for ultrafiltration control during hemodialysis, hemofiltration, or hemodiafiltration with at least one central venous catheter, an extracorporeal circuit with a hemodialyzer, hemofilter or hemodiafilter, a dialysate or filtrate circuit, at least one sensor for measuring the oxygen content, and means for the controlled removal of fluid connected to a control unit, said apparatus comprising a control connection between the said oxygen sensor and the said control unit such that the ultrafiltration is controllable as a function of the oxygen content measured by said oxygen sensor.
Specification