The present invention relates to a method of determining a system compressibility value of a medical membrane pump drive, wherein a first and second pressure level are moved to and a first and second operating parameter value of the membrane pump drive are detected; wherein the system compressibility value is determined on the basis of the detected operating parameter values; and wherein the membrane of the membrane pump drive is supported at a rigid surface during the determination of the system compressibility value.

Microplegia systems describe herein use syringe pumps that are controlled in a coordinated fashion to deliver cardioplegia medications during an open-heart surgery at the prescribed dosages and/or rates. The microplegia systems link the delivery rate of the syringe pumps with the delivery rate of the cardioplegia blood flow rate. A perfusionist can enter prescribed drug concentrations, desired ratios between drug and blood, and the expected dose for each phase of the myocardial protection scheme that will take place during the open-heart surgery. Additionally, or alternatively, the syringe pump systems described herein can also be used to deliver other non-cardioplegia types of therapeutic substances

The invention is about a next-generation blood pump that provides pulsatile blood flow, and has been developed for cardiopulmonary by-pass devices used for maintaining extracorporeal blood circulation during heart surgeries and the supportive devices of circulation system. This device is technically a sort of synchronous power-assisted motor employing direct driver technology. The mentioned blood pump contains a rotor rotating on a magnetic bearing without a shaft and through the helical wings placed into the rotor it provides pulsatile blood supply adequate for the body requirement synchronous with the ECG signals received from the patients. It provides a patient safer and controlled pulsatile blood flow while running at high efficiency.

The specification discloses a portable dialysis machine having a detachable controller unit and base unit. The controller unit includes a door having an interior face, a housing with a panel, where the housing and panel define a recessed region configured to receive the interior face of the door, and a manifold receiver fixedly attached to the panel. The base unit has a planar surface for receiving a container of fluid, a scale integrated with the planar surface, a heater in thermal communication with the planar surface, and a sodium sensor in electromagnetic communication with the planar surface. Embodiments of the disclosed portable dialysis system have improved structural and functional features, including improved modularity, ease of use, and safety features.

The invention relates to a method of purging gas bubbles from a target zone of an extracorporeal blood circuit of a dialysis machine, wherein the target zone is flowed through by flushing liquid which enters into the target zone through an inflow and exits it again through an outflow, wherein the inflow differs from the arterial port and the outflow differs from the venous port of the extracorporeal blood circuit. The invention furthermore relates to a dialysis machine having an extracorporeal blood circuit and a control unit, with the extracorporeal blood circuit having an inflow and an outflow for flushing liquid, with the inflow differing from the arterial port and the outflow differing from the venous port of the extracorporeal blood circuit, and with the control unit being configured to carry out a method in accordance with the invention. The invention furthermore relates to a disposable for the dialysis treatment, wherein the disposable comprises an arterial line, elements of a blood pump, a dialyzer and a venous line, wherein the disposable has an interface for the inflow of flushing liquid in the arterial line and an interface for the outflow of flushing liquid in the venous line, and wherein the interface for the inflow differs from the arterial port and the interface for the outflow differs from the venous port of the hose set.

Filtration systems and methods using a pump and pressure sensor are provided for improved efficiency in fluid filtration systems. A filtration system includes a pre-filter container joined to a post-filter container by a filter line having a filter. To reduce the time required for filtration a pump and pressure sensor are included in a filter inlet flow path. The pump also is used to provide air management in the system via pre-filtration evacuation of air from at least the filter.

An embodiment includes a cardioplegia delivery system having a console, controller, and disposables. The system aides the perfusionist in cardioplegia delivery to the patient during Cardiopulmonary Bypass Surgery. The console, in conjunction with the disposables, combines blood from the heart-lung machine and crystalloid from the IV-bag in a specified ratio and then adds in a drug (arrest agent and/or additive). The electro-mechanical console incorporates a blood/crystalloid pump, temperature controllable water circulation system, pressure and temperature monitors, a sensor interface with the disposables, an arrest agent pump, an additive pump and ultra-sonic air detection sensors. The system monitors and controls the blood-crystalloid ratio, drug concentration, flow rate, pressure, temperature, and delivery route of the cardioplegia solution delivered to the patient. The system is a software-controlled system with a graphical user interface controller. The controller is utilized to initiate/stop cardioplegia delivery, monitor delivery parameters and view/save relevant case information and data.

The invention relates to a method of purging gas bubbles from at least one target zone of an extracorporeal blood circuit, preferably of an extracorporeal blood circuit of a dialysis machine, with a flushing liquid, wherein the flow rate and/or the pressure of the flushing liquid in the extracorporeal blood circuit is/are inconstant at least at times during the flushing process; and/or wherein the flow rate of the flushing liquid in the extracorporeal blood circuit lies above a range of possible flow rates at least at times during the flushing process, which range is used during the treatment for the blood. The invention furthermore relates to an extracorporeal blood treatment unit having an extracorporeal blood circuit, a pump and a control unit, with the control unit being configured to carry out a flushing process in accordance with the invention. The invention furthermore relates to an extracorporeal blood treatment unit having an extracorporeal blood circuit, a pump and a control unit, with the control unit being configured such that the conveying speed for blood is slowly increased after a standstill of the pump or after an operation of the pump at throttled speed.

The present invention relates to a method of flushing a dialyzer with a flushing liquid, wherein the dialyzer is arranged in a dialyzate-side circuit of a blood treatment device and wherein the dialyzer has at least one dialyzate-side chamber which has at least one inlet and at least one outlet for the flushing liquid and which is flowed through by the flushing liquid, wherein at least one property of the flushing liquid is measured at the outlet of the dialyzer or downstream of the dialyzer in the dialyzate-side circuit to obtain one or more outlet-side measured values, wherein the property depends on the quantity of the air in the flushing liquid.

A portable medical apparatus for cardiopulmonary aid to patients includes a transportable machine body that integrates an heater/cooler unit and an extracorporeal circuit for circulating the blood of a patient. The extracorporeal circuit includes a line for drawing venous blood from the patient, a line for returning arterial blood to the patient, a pumping unit for pumping blood along the extracorporeal circuit, a heat exchanger for thermoregulating blood in the extracorporeal circuit, and an oxygenator unit for blood oxygenation.