Abstract:
A device (10) for measuring ultrasonic activity in an ultrasound delivery system has a sensor (50) for providing an output representative of a sensed ultrasound vibration level, an indicator (14) for receiving the output of the sensor (50) and providing an indication of the vibration level sensed thereby, and a rigid body (16) to which the sensor is attached. The rigid body (16) comprises a sensor attaching portion and a catheter abutting portion (18) configured to abut the distal end of an ultrasound delivery system catheter (20). Ultrasonic activity of the ultrasound delivery system is measured by abutting the distal end of the catheter (20) to the catheter abutting portion (18) of the rigid body (16) and noting the indication provided by the indicator (14). Use of a disposable sterile catheter abutting portion (18) removably attachable to the sensor attaching portion facilitates isolation of the sensor attaching portion within a bag along with an ultrasound transducer.
Abstract:
A connector having an occluder which transposes between a first position and a second position is provided for maintaining a sterile environment during connection and disconnection of fluid communication between a container and a fluid line. The occluder is in the form of a spherical ball integrally formed with a length of tubing. The occluder has a diameter slightly larger than an end of the connector such that the occluder rolls into the end upon disconnecting from the system. An interface may be provided to receive a single connector or a pair of connectors to assist in fluid control between the container and the fluid line.
Abstract:
A method for preparing a purified and stable activated human Factor VIII composition is disclosed. A purified and stable activated human Factor VIII composition having a specific activity of at least 100,000 units per mg protein, or a potency of at least 15,000 units per ml is also disclosed.
Abstract:
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).
Abstract:
Systems and methods for resuspending cellular-rich concentrates of blood are disclosed. Systems include first compartment (24) including a blood inlet port (40) and a plasma-rich platelets (PRP) collection port (38) and a red blood cell collection port (42), and second compartment (26) including a platelet-poor plasma (PPP) collection port (44) and a leukocyte-depleted PRP (LDPRP) inlet port (46), and a separation element (14). In resuspension mode, a volume of retained PPP is returned through the PPP collection port (44) into the second compartment (26) to mix with and resuspend leukocyte-depleted platelet concentrate (LDPC) in the second compartment (26). During the resuspension period, a rotor (28) slowly oscillates the second compartment (26) first in one rotational direction and then in an opposite rotational direction. The oscillation creates variable agitation forces that aid the mixing and resuspension process within the second compartment (26).
Abstract:
A cannula structure (40, 100), comprising a cannula (42, 94, 102) having a tubular member (70, 92, 110) secured thereon in surrounding relationship by the exertion of sufficient force by an interior wall of the tubular member on the cannula such that at least one fluid flow path is provided between an exterior wall of the cannula and the interior wall of the tubular member. Preferably, the tubular member is squeezed on opposite sides of the cannula so as to secure the tubular member onto the cannula by crimping.
Abstract:
A patient fluid collection system is disclosed which includes a fluid collection reservoir (48), a cover (62) for the reservoir and a liner (60) within the reservoir comprising an enlargeable or expandable wall portion such that the wall portion (64) may expand if the liner fills with fluid. An anti-reflux system is also disclosed as well as a new tandem tube and a new connector.
Abstract:
A dynamic blood pump (10) includes a rotating core member (70) and rotating ring portion (76) effective to pre-spin blood before the blood enters helical pumping channels (96) of the pump. The blood is pumped and further rotated as it moves axially along the helical channels (96) toward a centrifugal section of the pump (40). At the centrifugal pumping section circumferential velocity differentials are also controlled to diminish damage to the blood. Outwardly of the centrifugal pumping section, a forced-vortex pumping section communicates the pumped blood to an exit port.
Abstract:
A process for purifying crude collagenase is disclosed. The collagenase purification process includes providing a stabilized crude collagenase solution containing collagenase, pigment, toxins, bacterial materials, and proteolytic enzyme impurities including clostripain, trypsin, and caseinase. The stabilized collagenase solution is applied to hydroxylapatite packing. Pigment and caseinase are eluted with a first solution comprising about 0.05 M to about 0.3 M phosphate buffer, and then collagenase, trypsine, and clostripain are eluted with a second solution comprising about 0.35 M to about 0.5 M phosphate buffer to provide a first collected solution. The first collected solution is then applied to gel filtration packing and collagenase and clostripain are eluted with a neutral pH buffer solution, to provide a second collected solution. The second collected solution is then applied to Reactive Red 120-Agarose packing and collagenase is eluted with a neutral pH buffer solution to provide purified collagenase. The process provides extremely pure collagenase in high yield with reduced consumption of eluting solutions and avoids unpredictable gradient eluting techniques.
Abstract:
The invention provides dual-skinned membrane useful as one way or rectifying membranes which reduce back filtration of solute molecules in dialysis and which improve nutrient supply and product recovery in membrane bioreactors. The membranes are dual-skinned polymeric materials preferably in the form of hollow fibers. The membranes have skins of polymer on the opposite sides with differing permeability to solutes and sieving coefficient characteristics. The skin on each side have pores that are invisible at 10,000 times magnification, the microporous structure between said skins contains pores capable of retaining solutes in a molecular weight range of about 5000 to 200,000 in an increased concentration between the interior and the exterior skins. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis means having rectifying properties.