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Perfusion balloon catheter
| Details |
Inventors: Abiuso, Christopher L.;
Assignee: Cordis Corporation (Miami Lakes, FL)
Primary Examiner: Yasko; John D.
Assistant Examiner:
Attorney, Agent or Firm: Lockwood, Alex, Fitzgibbon & Cummings
A catheter suitable for percutaneous translumenal coronary angioplasty procedures is provided. The catheter includes a balloon member having an interior and exterior surface and having at least one longitudinal portion bonded to a flexible tube. The balloon includes a collapsed condition of a size allowing it to be transported through a body vessel and an expanded condition of a size allowing it to engage a body vessel wall. The balloon in its expanded condition defines longitudinal passageways for perfusing blood past the balloon. |
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DETAILED DESCRIPTION PTCA procedures generally include inflation of a balloon in an arterial passage in an effort to clear a flow path for blood by dilating the stenosis.
Inflation of the balloon and subsequent deflation and removal of the balloon results in treatment of the stenosis to increase the available cross-sectional area for blood to flow through the arterial passage.
In typical PTCA procedures, a guiding catheter is inserted into the cardiovascular system through the Tee-brachial or femoral arteries, generally under local anesthesia, until the distal tip of the catheter is in a coronary artery and generally positioned adjacent a stenosis.
An extensible balloon of a dilation catheter is advanced through the guiding catheter alone or over a previously introduced guidewire until the balloon is positioned across the stenosis.
The balloon is then inflated to a predetermined size with a fluid, preferably a radiopaque liquid, to radially compress the inside of the artery wall, thereby dilating the lumen of the artery.
The balloon is then deflated so that the dilation catheter can be removed, and blood flow resumed through the dilated artery that now has a larger cross-sectional area to permit a greater volume of blood to flow therethrough.
In typical PTCA procedures, when the balloon of a dilation catheter is inflated in a coronary artery, all flow ceases through the coronary artery.
If blood flow ceases for too long a period of time, the part of the heart which that coronary artery serves can begin to suffer from lack of blood, or ischemia.
If the balloon remains inflated in the artery for prolonged periods of time, the injury caused by the absence of blood flow can be irreversible in some cases.
On the other hand, it has been found that the probability of an artery wall or the stenosis maintaining its dilated cross-sectional area after having been subjected to dilation from an extensible balloon is directly related to the length of time that the balloon is inflated while located across the stenosis
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