A blood pump is disclosed. The blood pump apparatus is arranged to provide pulsatile flow, and comprises a flexible inner cylindrical duct providing a blood flow region, and an outer cylindrical duct arranged to surround the inner cylindrical duct and arranged to accommodate a pumping fluid. In the pump the inner cylindrical duct is described as comprising a blood inlet for receiving blood into the region, a blood outlet for passing blood out from the blood flow region and a passageway therebetween. There is also described the feature of the inner duct comprising a non return valve at the blood inlet and a non return valve at the blood outlet, the outer cylindrical duct having a fluid port for a pumping fluid, and a pump device arranged to cyclically deliver and withdraw pumping fluid to the fluid port thereby cyclically compressing and expanding the flexible inner cylindrical duct urging blood through the blood flow region and delivering a pulsating blood flow through the blood outlet.
A61M 1/16 - Systèmes de dialyseReins artificielsOxygénateurs du sang avec membranes
A61M 1/36 - Autre traitement du sang dans une dérivation du système circulatoire naturel, p. ex. adaptation de la température, irradiation
A61M 39/24 - Soupapes de retenue ou soupapes anti-retour
A61M 60/113 - Pompes extracorporelles, c.-à-d. que le sang est pompé à l’extérieur du corps du patient incorporées dans des circuits ou des systèmes sanguins extracorporels dans d’autres dispositifs fonctionnels, p. ex. dialyseurs ou cœurs-poumons artificiels
A61M 60/268 - Pompes pour le sang à déplacement positif comportant un élément de déplacement agissant directement sur le sang l’élément de déplacement étant souple, p. ex. membranes, diaphragmes ou vessies
A61M 60/441 - Détails concernant l’entraînement pour les pompes pour le sang à déplacement positif la force agissant sur l’élément en contact avec le sang étant mécanique générée par un moteur électrique
A61M 60/562 - Moyens de commande électroniques, p. ex. pour la régulation par rétroaction pour pulser l’écoulement du sang dans les pompes pour le sang qui ne créent intrinsèquement pas un écoulement pulsé
A blood pump is disclosed. The blood pump apparatus is arranged to provide pulsatile flow, and comprises a flexible inner cylindrical duct providing a blood flow region, and an outer cylindrical duct arranged to surround the inner cylindrical duct and arranged to accommodate a pumping fluid. In the pump the inner cylindrical duct is described as comprising a blood inlet for receiving blood into the region, a blood outlet for passing blood out from the blood flow region and a passageway therebetween. There is also described the feature of the inner duct comprising a non return valve at the blood inlet and a non return valve at the blood outlet, the outer cylindrical duct having a fluid port for a pumping fluid, and a pump device arranged to cyclically deliver and withdraw pumping fluid to the fluid port thereby cyclically compressing and expanding the flexible inner cylindrical duct urging blood through the blood flow region and delivering a pulsating blood flow through the blood outlet.
Blood is treated externally to a human or animal body, the blood having been extracted from a first human or animal body for delivery to a second human or animal body. The temperature and/or composition of the blood are controlled.
Blood is treated externally to a human or animal body, the blood having been extracted from a first human or animal body for delivery to a second human or animal body. The temperature and/or composition of the blood are controlled.
A rheometeris disclosed for determining flow characteristics of a fluid. The rheometer comprises a circuit in which the fluid is arranged to flow. The circuit comprises a duct and a plurality of flow elements, each comprising a flow environment arranged in fluid communication with the duct. The flow environment of each element is arranged to convey fluid from an upstream position to a downstream position of the respective flow element. The rheometer further comprises pressure sensing means arranged to determine fluid pressure at the upstream position and the downstream position of each of the plurality of flow elements. At least two of the plurality of flow elements comprise different flow environments for the fluid such that the rheometer can determine the flow characteristics of the fluid at a particular instant in time.
G01N 11/08 - Recherche des propriétés d'écoulement des matériaux, p. ex. la viscosité, la plasticitéAnalyse des matériaux en déterminant les propriétés d'écoulement en mesurant l'écoulement du matériau à travers un passage étroit, p. ex. un tube, une ouverture en mesurant la pression nécessaire à la production d'un écoulement connu
A sensing device is provided. The device comprises a gas permeable member, a sensing member and optical means. The gas permeable member is arranged to receive gas from a substance to be tested. The sensing member is located adjacent to the gas permeable member and comprises a sensing substance. A property of the sensing substance is modified when it is brought into contact with the gas received by the gas permeable member. The optical means comprises a light source which is arranged to irradiate the sensing substance together with a first sensor which is configured to detect a change in the aforementioned property of the sensing substance.
A fluid pressure sensing device is disclosed for sensing the pressure of a fluid within a tube. The device comprises a clamp for clamping the tube (26) and sensing means for sensing changes in the cross-sectional area of the tube. (26) By referencing the changes in the cross-sectional area of the tube to predetermined calibration data, which relate known changes in tube (24) cross-sectional area to known fluid pressures, it is possible to continuously monitor fluid pressure within the tube. (24)
G01L 9/00 - Mesure de la pression permanente, ou quasi permanente d’un fluide ou d’un matériau solide fluent par des éléments électriques ou magnétiques sensibles à la pressionTransmission ou indication par des moyens électriques ou magnétiques du déplacement des éléments mécaniques sensibles à la pression, utilisés pour mesurer la pression permanente ou quasi permanente d’un fluide ou d’un matériau solide fluent
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