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Detection of Incompetent Perforator Veins

IP.com Disclosure Number: IPCOM000201044D
Publication Date: 2010-Nov-05
Document File: 1 page(s) / 29K

Publishing Venue

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Abstract

The invention is apparatus and method for detecting incompetent perforator veins to facilitate saphenous sparing superficial venous ablation. The invention includes placing a catheter in the vein, isolation of venous segments, introduction of fluid in a controlled manner, and monitoring the resulting pressure in the isolated venous segment. Pressure, flow rate, volume, diameter, impedance, and so forth can be used as inputs or outputs, but infusing fluid and monitoring pressure may be the most straightforward. A small amount of fluid may be infused in a step- or bolus- fashion, in alternating infusion / withdrawal pattern (which may include a net infusion over time to avoid removal of any significant amount of blood, or infusion at one flow rate followed by another flow rate, and so forth. A faster decay in pressure after a sudden infusion, for example, would indicate an incompetent perforator vein in the isolated segment. The presence of an incompetent vein would also produce a different amplitude and phase lag in a measured parameter upon application of pulsatile infusion.

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The invention is apparatus and method for detecting incompetent perforator veins to facilitate saphenous sparing superficial venous ablation. The invention includes placing a catheter in the vein, isolation of venous segments, introduction of fluid in a controlled manner, and monitoring the resulting pressure in the isolated venous segment. Pressure, flow rate, volume, diameter, impedance, and so forth can be used as inputs or outputs, but infusing fluid and monitoring pressure may be the most straightforward. A small amount of fluid may be infused in a step- or bolus- fashion, in alternating infusion / withdrawal pattern (which may include a net infusion over time to avoid removal of any significant amount of blood, or infusion at one flow rate followed by another flow rate, and so forth. A faster decay in pressure after a sudden infusion, for example, would indicate an incompetent perforator vein in the isolated segment. The presence of an incompetent vein would also produce a different amplitude and phase lag in a measured parameter upon application of pulsatile infusion.