Abstract: A roller pump conduit defining a pump chamber is provided. The roller pump conduit includes a roller contact portion having a fill region and a delivery region. The fill region has a first taper configured to determine volume delivery per revolution of a roller head. The delivery region has a pressure region having a second taper and a discharge region having a third taper. The third taper has a lesser degree of taper than the second taper. The delivery region is configured to produce a pulsatile flow out of the conduit. Furthermore, a roller pump having a roller pump conduit is provided. The roller pump conduit of the roller pump has a fill region and a delivery region, the fill region having a first taper, and the delivery region having a second and third taper, wherein the third taper has lesser degree of taper than the second taper.

Abstract: A roller pump conduit defining a pump chamber is provided. The roller pump conduit includes a roller contact portion having a fill region and a delivery region. The fill region has a first taper configured to determine volume delivery per revolution of a roller head. The delivery region has a pressure region having a second taper and a discharge region having a third taper. The third taper has a lesser degree of taper than the second taper. The delivery region is configured to produce a pulsatile flow out of the conduit. Furthermore, a roller pump having a roller pump conduit is provided. The roller pump conduit of the roller pump has a fill region and a delivery region, the fill region having a first taper, and the delivery region having a second and third taper, wherein the third taper has lesser degree of taper than the second taper.

Abstract: A roller pump conduit defining a pump chamber is provided. The roller pump conduit includes a roller contact portion having a fill region and a delivery region. The fill region has a first taper configured to determine volume delivery per revolution of a roller head. The delivery region has a pressure region having a second taper and a discharge region having a third taper. The third taper has a lesser degree of taper than the second taper. The delivery region is configured to produce a pulsatile flow out of the conduit. Furthermore, a roller pump having a roller pump conduit is provided. The roller pump conduit of the roller pump has a fill region and a delivery region, the fill region having a first taper, and the delivery region having a second and third taper, wherein the third taper has a lesser degree of taper than the second taper.

Abstract: A roller pump conduit defining a pump chamber is provided. The roller pump conduit includes a roller contact portion having a fill region and a delivery region. The fill region has a first taper configured to determine volume delivery per revolution of a roller head. The delivery region has a pressure region having a second taper and a discharge region having a third taper. The third taper has a lesser degree of taper than the second taper. The delivery region is configured to produce a pulsatile flow out of the conduit. Furthermore, a roller pump having a roller pump conduit is provided. The roller pump conduit of the roller pump has a fill region and a delivery region, the fill region having a first taper, and the delivery region having a second and third taper, wherein the third taper has lesser degree of taper than the second taper.

Abstract: A control system for regulating oxygen and carbon dioxide concentrations of blood in an ECLS circuit connected to a patient. The control system includes a gas analyzer that determines the concentrations of carbon dioxide in the blood being withdrawn from the patient and of the oxygen in blood being returned to the patient. The analyzer provides concentration signals corresponding to these concentrations to a system controller. The system controller is also inputted with setpoint values for these concentrations. Utilizing control algorithm, the system controller calculates gas flow control and blood flow control signals based on the differences of the concentration signals and the setpoint values. A gas flow controller coupled to the system controller receives the gas flow control signal provides gas from a gas source to the ECLS circuit at a predetermined rate in response thereto.

Abstract: A blood reservoir which includes a primary reservoir that smoothly transitions into an outlet reservoir located beneath the primary reservoir. An inlet port permits the inflow of blood into the reservoir and an outlet port permits blood to flow out of the outlet reservoir. The primary reservoir defines an upper cavity that has first average cross sectional flow area. The outlet reservoir defines a lower cavity that has a second average cross sectional flow area which is preferably not more than one-half of the first average cross sectional flow area. The outlet reservoir therefore exhibits an increased sensitivity to blood level changes in the reservoir. The reservoir further includes features which inhibit the flow of blood from the outlet reservoir if the volume of blood in the outlet reservoir is reduced to a predetermined safety level.

Abstract: An involuntary respiratory apparatus for perfusing and entraining a breathable liquid from the lungs of a patient. The system includes a number of components which are interconnected by a conduit so as to form a substantially closed loop, single path circuit. The various components include a reservoir, a pump, an oxygenator, a heat exchanger, an endotracheal tube, a Y-connector, a valve and a controller. To simulate inspiration, the controller closes the valve, which is located downstream of the Y-connector, thereby forcing the liquid into the lungs of the patient. After a tidal volume of liquid has been perfused into the patient's lungs, the controller opens the valve. The Y-connector is shaped such that the flow of liquid through its inspiratory limb will cause the liquid in the patient's lungs to be entrained into the flow out of the Y-connector. In this manner, the Y-connector operates as an ejector pump and allows the apparatus to continuously perfuse the liquid through the single path circuit.

Abstract: A peristaltic pump having controlled suction. In one embodiment, the pump includes a tubing which is collapsed when the internal pressure of the tubing is equal to or less than ambient. In this state, the pump is unable to generate negative pressures. An air-tight housing may be provided over the tubing and connected to a vacuum source. Upon a vacuum being applied, the tubing is capable of controllably producing negative pressures, allowing the pump to be operated as a suction pump. In another embodiment the tubing exhibits a variable cross-sectional width.

Abstract: A peristaltic pump having controlled suction. In one embodiment, the pump includes a tubing which is collapsed when the internal pressure of the tubing is equal to or less than ambient. In this state, the pump is unable to generate negative pressures. An air-tight housing may be provided over the tubing and connected to a vacuum source. Upon a vacuum being applied, the tubing is capable of controllably producing negative pressures, allowing the pump to be operated as a suction pump. In another embodiment the tubing exhibits a variable cross-sectional width.

Abstract: A self-regulating peristaltic pump having a pumping chamber of enhanced operating life. The operating life of the tubing is improved by a combination of features including providing the tubing with a naturally collapsed passageway. The tubing is collapsed when the internal pressure of the tubing is equal to or less than ambient. In this state, the pump is unable to generate negative pressures. Upon fluid being supplied to the tubing at a pressure greater than ambient, the tubing inflates and cooperates with rollers of the pump to transmit the fluid. The pump also includes a novel means for adjusting and regulating the tension of the tubing further enhancing the operating life of the tubing.