Devices for removing fibrin sheaths from catheters

Details Devices for removing fibrin sheaths from catheters Devices for removing fibrin sheaths from catheters

1995-04-05

1997-07-01

Hafer, Robert A.

Surgery

Instruments

Means for removing tonsils, adenoids or polyps

606106, 606127, A61B 1722

Patent

active

056432810

ABSTRACT:
Medical devices have a snare loop for removing patient-internal material, for example, a fibrin sheath which may form at the distal end of a venous catheter, and may be inserted intraluminally through the catheter during a medical procedure. The snare loop is capable of retroflexing in a proximal direction when extended beyond the distal end of the catheter so that the snare loop encircles the catheter's distal region. Such retroflexing may be accomplished by incorporating at least one pair of bend regions in the guide wire which are axially spaced-apart from one another. These bend regions will cause the shape-memory guide wire to flex upon advancement of the device beyond the distal end of the venous catheter so that the snare loop is capable of retroflexing around the catheter's distal end. Alternatively, a number of proximally directed struts having one end attached to the distal end of the guide wire. A draw wire extends from the guide catheter and is flexed in a proximal direction so as to be connected to the snare loop which is positionally held by the terminal ends of the struts. A membrane may optionally be connected to the struts so that the removed fibrin sheath segment may be captured and removed proximally through the lumen of the implanted catheter.

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The Retriever--Endovascular Snare by Target Therapeutics, Aug. 27, 1992.

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