Percutaneous oxygenator for inducing a retrograde perfusion...

A - Human Necessities – 61 – M

Patent

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Details

A61M 37/00 (2006.01) A61M 1/16 (2006.01)

Patent

CA 2340006

A percutaneous oxygenator is used to induce a retrograde perfusion of oxygenated blood in a vein to a compromised organ (e.g., to the brain following a stroke, or to the heart following a heart attack). The oxygenator (10) has an occluding balloon (25) and an oxygenation balloon (20) located upstream from the occluding balloon (25). A plurality of hollow gas-permeable fibers (14) surrounds the oxygenation balloon (20). The oxygenator (10) is inserted into a vein (84) downstream from the compromised organ. An external supply of air/oxygen is connected to create a flow through the fibers (14) and thereby oxygenate blood in the surrounding vein. A retrograde flow of oxygenated blood is induced in the vein to the compromised organ by first inflating the occluding balloon (25) to occlude the vein and then inflating the oxygenation balloon (20). Both balloons (25, 20) are then deflated to permit the normal antegrade flow of blood through the vein. This process of inflation and deflation is periodically repeated at a rate of about 30 to 60 cycles per minute. The percutaneous oxygenator (10) may be equipped with multiple occluding balloons for blocking several branches of the venous system leading from the compromised organ.

L'invention concerne un oxygénateur percutané pour perfusion rétrograde de sang oxygéné dans une veine d'organe ayant subi une lésion (par exemple, cerveau après accident vasculaire cérébral, ou coeur après infarctus du myocarde). L'oxygénateur (10) comprend un ballonnet occlusif (25) et un ballonnet d'oxygénation (20) placé en amont par rapport au ballonnet occlusif (25). Plusieurs fibres creuses perméables aux gaz (14) entourent le ballonnet d'oxygénation (20). L'oxygénateur (10) est introduit dans une veine (84) en aval de l'organe affecté. Une source extérieure d'air/oxygène est connectée, de manière à créer un flux dans les fibres (14) et à oxygéner ainsi le sang dans la veine. Un flux rétrograde de sang oxygéné est induit dans la veine vers l'organe affecté, d'abord par gonflement du ballonnet occlusif (25), de manière à établir une occlusion dans la veine, et ensuite par gonflement du ballonnet d'oxygénation (20). Les deux ballonnets (25, 20) sont alors dégonflés pour assurer un flux antérograde de sang dans la veine. Ce processus de gonflement et de dégonflement est répété périodiquement à une fréquence d'environ 30 à 60 cycles par minute. L'oxygénateur (10) peut être équipé de plusieurs ballonnets occlusifs afin de bloquer plusieurs branches du système veineux partant de l'organe affecté.

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