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Cylindrical blood heater/oxygenator

a technology of oxygenator and cylindrical chamber, which is applied in the direction of glucose production, membranes, food preparation, etc., can solve the problems of unsatisfactory oxygenation of the blood outside perfusion, unsatisfactory oxygenation of the blood, and large device size with undesirable high blood priming volume, etc., to achieve the effect of easy assembly and minimal priming volum

Inactive Publication Date: 2000-07-11
EDWARDS LIFESCIENCES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention pertains to a novel compact integrated blood heater/oxygenator in which the blood advantageously flows transversely to the axial direction of hollow heat ex...

Problems solved by technology

However, outside perfusion has had the disadvantage of being subject to less than the desired oxygenation of the blood because of region channeling of the blood as it passes the outsides of the hollow fibers.
Low transport efficiency results in bulky devices with undesirable high blood priming volumes.
However, if the number of fibers used in such a blood oxygenator is large (as is desirable) and / or the flow rate of blood is increased in order to treat large volumes of blood, problems arise.
For example, unacceptable pressure drop of the blood between inlet and outlets and / or channeling of the blood between groups of fibers may occur.
A problem with prior blood oxygenator / heater combination devices which has been recognized in the prior art is the considerable bulk, with consequent large priming volume of the combined devices.
Such flat devices, however, are difficult to manufacture because of the difficulty of properly packing the gas exchange fibers for optimal efficiency.

Method used

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  • Cylindrical blood heater/oxygenator
  • Cylindrical blood heater/oxygenator
  • Cylindrical blood heater/oxygenator

Examples

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Embodiment Construction

The invention is best described by reference to the preferred embodiment as illustrated in FIGS. 1-5.

The preferred heat exchanger / oxygenator device of the invention is generally designated in the figures by the numeral 10. The exterior of device 10 comprises a generally cylindrical exterior wall portion 12, proximal cover member 14 and distal cover member 20. The distal cover 20 includes a central blood inlet port 26, a heating fluid outlet port 28 and a gas outlet port 30.

The proximal cap 14 includes a blood outlet port 32, a heater exchange fluid inlet port 36 and a gas inlet port 38. Raised circular portions 40 and 42 define heat exchange fluid and gas distribution manifolds, respectively, which provide fluid communication between the respective inlet ports 36 and 38 and respective hollow bundles of heat exchange and gas exchange fibers, respectively, within the device. A raised circular portion 44 defines a blood collecting manifold which, as shown in FIG. 1, increases in dimens...

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Abstract

A combination heat exchanger and oxygenator device is provided. The device includes a generally cylindrical housing having first and second compartments with hollow heat exchange tubes and hollow gas exchange tubes disposed therein, a blood inlet, a blood outlet, a heat exchanges medium inlet, a heat exchange medium outlet, an oxygenating fluid inlet and an oxygenating fluid outlet. The housing has a central axis with the second compartment being concentric thereto. The blood flow passage is defined by blood entering the device generally axially through a path extending along the central axis of the housing and flows generally radially through the second, oxygenating compartment.

Description

FIELD OF THE INVENTIONThis invention relates to a blood oxygenator having an integral heat exchanging unit, the oxygenator being of the outside perfusion type.BACKGROUND OF THE INVENTIONBlood OxygenatorsIn known blood oxygenators, hollow fibers are used as a means to bring blood into contact with oxygen and provide a means for removal of carbon dioxide from the blood. The fibers are typically made of a homogeneous membrane of gas-permeable material such as silicone or of hollow fibers made of a microporous membrane of hydrophobic polymeric material such as polyolefins.There are two types of hollow fiber blood oxygenators: the inside perfusion type in which blood is passed through the bores of the hollow fibers while oxygen is passed on the outside of the hollow fibers, and the outside perfusion type. Blood oxygenators of the outside perfusion type pass oxygen through the bores of the hollow fibers while blood is flowed past the outside of the hollow fibers.Examples of inside perfusi...

Claims

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Application Information

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IPC IPC(8): A61M1/16B01D63/02B01D63/04
CPCA61M1/1698B01D63/02B01D63/04B01D63/025A61M1/1625A61M1/1629A61M2206/16Y10S261/28Y10S128/03B01D2313/38B01D2313/221A61M1/3623B01D63/069
Inventor COSENTINO, LOUIS C.LEE, JEFFREY A.BAKER, DANIEL A.
Owner EDWARDS LIFESCIENCES CORP
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