Improved devices for removing fibrin sheaths from catheters

Details Improved devices for removing fibrin sheaths from catheters Improved devices for removing fibrin sheaths from catheters

A - Human Necessities

61

M

A61M 25/088 (2006.01) A61B 17/22 (2006.01) A61M 25/00 (2006.01)

Patent

CA 2217481

A medical device (10) adapted especially to remove biological material (e.g., fibrin sheath) from the distal end of a patient internal catheter that includes a tubular element (12), a central wire (14) positioned within the tubular element, a snare wire (16) attached at one end (16a) to the central wire so as to form an acute angle therewith, and at its other end (16b) to the tubular member. The snare wire includes a proximally extending segment which follows a course of about 360 degrees about the distal end (12a) of the tubular member, and thus may be positioned adjacent the catheter's distal end. By effecting relative rotation between the central wire and the tubular member (for example, by rotating the central wire about its longitudinal axis while maintaining the tubular member stationary) will cause the snare wire segment to wrap around the catheter's distal end. Thereafter, manipulation of the device so as to advance the wrapped snare wire segment in a distal direction will strip the biological material from the distal end of the catheter.

Dispositif à usage médical (10) spécialement conçu pour enlever les matières biologiques (par exemple un dépot de fibrine) de l'extrémité distale d'un cathéter dans l'organisme d'un patient. Ce dispositif comprend un élément tubulaire (12), un fil central (14) placé à l'intérieur de l'élément tubulaire, un fil formant un noeud coulant (16) attaché par l'une de ses extrémités (16a) au fil central, de manière à former un angle aigu avec celui-ci et, par l'autre extrémité (16b), à l'élément tubulaire. Le fil formant un noeud coulant comporte un secteur proximal qui suit un cheminement d'environ 360 degrés autour de l'extrémité distale (12a) de l'élément tubulaire et peut ainsi se placer de manière contiguë par rapport à l'extrémité distale du cathéter. En réalisant une rotation entre le fil central et l'élément tubulaire (par exemple en faisant tourner le fil central selon son axe longitudinal tout en maintenant l'élément tubulaire fixe), on obtient un enroulement du noeud coulant autour de l'extrémité distale du cathéter. Après quoi, une manoeuvre du dispositif tendant à faire avancer dans le sens distal le noeud coulant permet d'obtenir un enlèvement de la matière biologique de l'extrémité distale du cathéter.

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