Abstract: The present invention relates to a fluid pump that comprises a housing having an inlet opening for receiving the fluid, an outlet opening for discharging the fluid and enclosing an impeller rotating inside the housing to pump the fluid from the inlet opening to the outlet opening and a motor assembly to drive the impeller. The housing is shaped to establish a single turn volute of 360° turn angle providing a first conveying channel located peripherally around the impeller from a fluid entry point at 0° turn angle to a fluid exit point at 360° turn angle of the single turn volute being connected to the outlet opening. The first conveying channel has a first cross section area in radial direction perpendicular to the rotational plane of the impeller, where a size of the first cross section area increases as a monotonic increasing function of the turn angle between entry point and exit point.

Abstract: The present invention relates to a fluid pump that comprises a housing having an inlet opening for receiving the fluid, an outlet opening for discharging the fluid and enclosing an impeller rotating inside the housing to pump the fluid from the inlet opening to the outlet opening and a motor assembly to drive the impeller. The housing is shaped to establish a single turn volute of 360° turn angle providing a first conveying channel located peripherally around the impeller from a fluid entry point at 0° turn angle to a fluid exit point at 360° turn angle of the single turn volute being connected to the outlet opening. The first conveying channel has a first cross section area in radial direction perpendicular to the rotational plane of the impeller, where a size of the first cross section area increases as a monotonic increasing function of the turn angle between entry point and exit point.

Abstract: The invention relates to a blood withdrawal cannula (4) for connecting a pump (2) assisting or replacing activity of the heart to the inner volume of a heart ventricle (1), in particular the left ventricle. At the end thereof that is located in the ventricle the cannula has a pressure sensor (7a, 7b) for measuring the ventricle pressure and/or ventricle pressure differences and at the same end of the cannula has a volume sensor (3a, 3b, 5, 6) for measuring the volume and/or volume changes of the ventricle (1) in at least a partial region of the ventricle. The invention further relates to a measuring device for monitoring the ventricle contractions and/or the function of a pump replacing or assisting activity of the heart. The measuring device can be/is connected to the pressure sensor (7a, 7b) and to the volume sensor of a blood withdrawal cannula according to any one of the preceding claims and is designed to detect pressure changes and volume changes of a ventricle (1) as the heart is beating.