摘要:
Methods and apparatus for concentrating and recovering pathogens from a fluid other than blood are disclosed. The method includes concentrating the pathogens contained in the fluid by continuously feeding the fluid through one or more flexible chamber(s) and subjecting the chamber(s) to centrifugal forces. The concentrated pathogens may be re-suspended by shaking the chamber(s).
摘要:
A chamber for rotation about a rotational axis to separate blood components includes first and second spaced apart side walls forming a separation zone. Blood conveyed into the separation zone separates into a first region of cellular components, a second region of plasma, and an interface region between the first and second regions. An outlet conveys the second region of plasma from the separation zone. An interior wall extends into the separation zone to permit passage of the second region of plasma to the outlet while retarding passage of the interface region and the first region of cellular components to the outlet. The tapered second surface has a major axis that is oriented at a non-parallel angle with respect to the axis of the outlet. Due to this orientation, the boundary between the interface region and the other two regions is held uniform along the tapered surface. The boundary does not bulge to spill materials in the first interface region or interface region over the first surface and into the constricted passage. As a result, the second region of plasma is kept essentially free of other materials.
摘要:
Systems and methods take into account that the spleen normally holds a number of platelets in reserve out of circulation. During blood procesing, the spleen releases these platelets into the donor's circulatory system, making them available for collection. The systems and methods estimate the number of platelets NSPLEEN held in reserve by the spleen in a human body. The systems and methods derive a splenic mobilization function Spleen, which can be expressed as a function of a precount of platelets PltPRE. The systems and methods estimate NSPLEEN where: NSPLEEN = Spleen-1 x PltPRE x DonVol where DonVol is blood volume in the body. The systems and methods can also estimate the total number of platelets NPLT in a human body, taking the Spleen function into account, where: NPLT = PltPRE x Spleen x DonVol.
摘要:
Blood collection systems and methods minimize citrate toxicity in donors. The systems and methods convey whole blood at a prescribed rate Qb into a separation device for separation into red blood cells and a plasma constituent. The systems and methods add anticoagulant including citrate to the whole blood. The systems and methods control Qb (in ml/min or equivalent) based upon a citrate equivalent blood flow rate EqQBCIR, where: where: CIR is a selected nominal a-symptomatic citrate infusion rate (in mg/kg/min or equivalent), AC is a selected anticoagulant ratio, Wgt is the donor's weight (in kg or equivalent), and CitrateConc is the citrate concentration in the anticoagulant (in mg/ml or equivalent).
摘要:
A cassette (22A/B/C) serves in association with one or more peristaltic pumps to centralize pumping, valving, and pressure sensing functions. The cassette includes a housing (110) having first and second pump ports. A flexible tubing loop (134/136) extends between the first and second pump ports outside the housing for engagement with an external peristaltic pump element. A liquid port on the housing attaches to a length of tubing that also extends outside the housing. Liquid passages within the housing establish communication among the liquid port, the first pump port and the second pump port. Valve stations (Vn) formed within the housing are responsive to the application of external force for controlling liquid flow through the liquid passages. A sensing chamber (Sn) is formed within the housing along at least one liquid passage. The sensing chamber transmits information regarding liquid pressure present within the one liquid passage to an external sensing element.
摘要:
Systems and methods for collecting cellular-rich concentrates of blood are disclosed. Blood from donor (78) is mixed with anticoagulant (90) and conveyed to a first separation device (12) for separating an anticoagulated cellular suspension from blood. The anticoagulated cellular suspension is conveyed to a second separation device (14) for removing leukocytes. Leukocyte-depleted cellular suspension is conveyed to a third separation device (16) for concentrating the leukocyte-depleted cellular suspension into a cellular-rich concentrate and a cellular-poor component and a portion of the cellular-poor component is returned to the donor (78). A controller (88) is used to control the process including monitoring the rate at which anticoagulant carried in the cellular-poor component is being infused with the returned cellular-poor component into the donor (78).
摘要:
Systems and methods are provided for reducing the number of leukocytes in cellular products like platelets collected in an on-line or continuous blood separation processes. The systems include first separation element (12) for separating blood into a suspension of platelets, second separation element (14) for reducing the number of leukocytes in a suspension of platelets, third separation element (16) for separating a suspension of platelets into a platelet-rich concentrate and a control means for operating separation elements (12, 14, 16) in various modes. The methods for obtaining a high quality blood product suited for therapeutic use are disclosed.
摘要:
L'invention concerne une chambre (76) utilisée dans un champ rotatif pour séparer les composants du sang. Le sang est introduit dans la chambre (76) par un orifice d'entrée (68) situé près d'une extrémité de la chambre, de manière à s'écouler circonférenciellement autour de l'axe de rotation vers l'extrémité opposée de la chambre (76) pour obtenir la séparation d'au moins un composant du sang. Au moins un orifice de sortie (72) est juxtaposé à l'orifice d'entrée (68) près d'une extrémité de la chambre (76) pour conduire un composant séparé du sang à partir du canal. la chambre (76) dirige le composant séparé du sang vers une zone de récupération (124) située près de l'extrémité opposée de la chambre (76). Un passage intérieur (126) fermé de récupération, situé à l'intérieur du canal, dirige le composant récupéré et mène depuis la zone de récupération (124) vers l'orifice de sortie (70) pour assurer le transport à partir de la chambre (76).
摘要:
L'invention concerne des membranes à double peau utiles comme membranes unidirectionnelles ou de rectification réduisant la refiltration de molécules dissoutes en dialyse, et améliorant l'apport de constituants nutritifs ainsi que la récupération de produits dans des bioréacteurs à membranes. Les membranes sont des matières polymères à double peau se présentant de préférence sous la forme de fibres creuses. Lesdites membranes présentent des peaux en polymère sur les faces opposées, avec différentes caractéristiques de coefficients de porosité ou de tamisage. Les membranes sont formées par extrusion d'un polymère dissous dans un solvant, tout en mettant en contact au moins une surface avec un non-solvant miscible audit solvant. On met en contact l'autre surface avec un non-solvant. Soit les deux non-solvants sont différents l'un de l'autre soit un des non-solvants contient un additif soluble changeant la porosité de la peau formée sur le polymère extrudé dissous. On obtient des dispositifs de dialyse améliorés en utilisant des faisceaux des membranes à fibres creuses comme moyen de dialyse présentant des propriétés de rectification. On obtient des bioréacteurs améliorés en utilisant des faisceaux de membranes à fibres creuses comme milieu de croissance ayant des propriétés de rectification.