A method is provided for the real time calibration of a pump that is part of a reusable hardware component having a programmable controller during a blood separation procedure where fluid is flowed through a tubing in a tubing set by action of the pump. The method comprises programming the controller with a continuous function defining a relationship between pump inlet pressure and pump stroke volume; commencing the fluid processing procedure to operate the pump to draw fluid through the tubing; measuring fluid pressure in the tubing at the inlet of the pump; calculating a current pump stroke volume with the controller based on the continuous function and the pump rotational rate; and adjusting the pump rotational rate utilized by the controller to control the procedure to achieve a target fluid flow rate. The continuous function defining the relationship between pump inlet pressure and the pump stroke volume may be empirically determined over a predetermined range of inlet pressures.

A method for filling and venting a device for extracorporeal blood treatment is disclosed, such as a patient module in a heart-lung machine, without attached patient. A filling liquid from a filling liquid container located higher than the device flows by gravity via a venous side of the system into a reservoir and flows onwards into a blood pump located at the lower end of the reservoir, wherein a first controllable valve (HC1) for a venting line of a filter is opened and, after the response of an upper filling level sensor in the reservoir, is closed. An upper level of the filter is positioned higher than the upper filling level sensor, and a start-stop motion of the blood pump is performed, as a result of which a stepped flooding of the filter is made providing for an advantageous de-airing of the device.

A control system is provided to restrict the flow rate of blood in a venous line 12 of a perfusion system 1 comprising a reservoir 10 supplied by the venous line 12 and supplying an outgoing line 22. The control system comprises an outgoing flow sensor 32 configured to determine an outgoing flow value indicative of the outgoing flow rate in the outgoing line 22, and a controller configured to process the outgoing flow value and to determine if the outgoing flow value exceeds a pre-set pairing threshold. The system further comprises an adjustable restriction 28 for restricting the flow rate in the venous line 12 to maintain a venous flow rate that does not exceed a venous restriction threshold, wherein the adjustable restriction 28 is responsive to the controller and wherein the controller comprises a configuration allowing the controller to set the adjustable restriction at the level of the outgoing flow rate, to change the venous restriction threshold with the outgoing flow rate, if the outgoing flow value is above the pre-set pairing threshold.

An apparatus and method for extracorporeal blood treatment, especially a dialysis apparatus, are disclosed, the apparatus includes a radar sensor for monitoring a patient located at a place of treatment.

This document describes stepper motor drive systems. The stepper motor drive systems can be used in many different applications including, for example, to drive a stepper motor of an occluder device in association with a heart-lung machine.

The invention relates to a blood treatment device having at least one metering line which opens into a fluid circuit, wherein a conveyor module is arranged in the metering line and comprises a membrane pump and a valve which is arranged at the pressure side thereof and which can act both as a blocking valve and as a restricting valve.

A blood purification apparatus in which the error in the amount of discharge from a blood pump that is caused by the change in the suction pressure of the blood pump is reduced. A blood purification apparatus includes a blood circuit through which blood of a patient is extracorporeally circulated; a dialyzer connected to proximal ends of an arterial blood circuit and a venous blood circuit and that purifies the blood extracorporeally circulating through the blood circuit; a squeezable tube connected to the arterial blood circuit; a blood pump allowing liquid in the squeezable tube to flow by squeezing the squeezable tube in a lengthwise direction while compressing the squeezable tube in a radial direction; and a pressure-detecting device attached to a predetermined position of the arterial blood circuit that is nearer to a distal end than a position where the blood pump is provided, the pressure-detecting device being capable of detecting a suction pressure of the blood pump.

This document describes stepper motor drive systems. The stepper motor drive systems can be used in many different applications including, for example, to drive a stepper motor of an occluder device in association with a heart-lung machine.

A method for filling and venting a device for extracorporeal blood treatment is disclosed, such as a patient module in a heart-lung machine, without attached patient. A filling liquid from a filling liquid container located higher than the device flows by gravity via a venous side of the system into a reservoir and flows onwards into a blood pump located at the lower end of the reservoir, wherein a first controllable valve (HC1) for a venting line of a filter is opened and, after the response of an upper filling level sensor in the reservoir, is closed. An upper level of the filter is positioned higher than the upper filling level sensor, and a start-stop motion of the blood pump is performed, as a result of which a stepped flooding of the filter is made providing for an advantageous de-airing of the device.

Medical fluid management assembly includes: a pneumatic manifold including multiple plates forming pneumatic passageways, a pneumatic valve chamber and a pneumatic pump chamber, the valve chamber in pneumatic communication with at least one passageway, the pump chamber in pneumatic communication with at least one passageway; and a fluid manifold including multiple fluid pathways, a fluid valve chamber in selective fluid communication with a fluid pump chamber and at least one fluid pathway, wherein (a) the pneumatic valve chamber and the fluid valve chamber are mated together to compress a membrane and (b) the pneumatic pump chamber and the fluid pump chamber are mated together to compress a membrane, wherein at least one of the pneumatic valve chamber or the pneumatic pump chamber extends from the at least one plate, or the fluid valve chamber or the fluid pump chamber extends from the fluid manifold to aid in compressing the membranes.