Telescoping serial elastic band ligator

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/128 (2006.01) A61B 17/12 (2006.01)

Patent

CA 2158976

A ligating band dispenser for dispensing a plurality of elastic ligating bands onto at least one internal tissue site within a patient's body, comprising an inner cylinder having proximal and distal portions, the inner cylinder being adapted to support at least one ligating band in a stretched condition about the distal portion thereof; an intermediate cylinder having proximal and distal portions and a distal end, the intermediate cylinder being positioned about at least the proximal portion of the inner cylinder and adapted to support at least another ligating band in a stretched condition about the distal portion thereof, the inner and intermediate cylinders comprising axially sliding cylinders; and an outer cylinder positioned about at least the proximal portion of the intermediate cylinder, the outer cylinder having a distal end, the sliding cylinders being axially slidable mounted with respect to the outer cylinder. A trip wire is connected to the inner cylinder and extends proximally therefrom, the trip wire being adapted to cause an axially sliding motion of the sliding cylinders during an application of force to the trip wire. Restraining means associated with each sliding cylinder are provided for restraining the sliding motion thereof during the application of force to the trip wire. Releasing means are also provided for releasing the restraining means associated with one of the sliding cylinders upon the application of the pulling force, whereby the released sliding cylinder slides and the distal end of one of the intermediate and outer cylinders pushes the ligating band therefrom during the application of the pulling force.

Distributeur d'anneaux de ligature comportant une pluralité d'anneaux élastiques de ligature dont au moins un repose sur chacun d'une série de cylindres partiellement emboîtés. Des cylindres intérieur et intermédiaires renferment des cylindres coulissants axialement pour distribuer lesdits anneaux de ligature. Un cylindre extérieur, qui peut être fixé à l'extrémité distale d'un introducteur de forme allongée, entoure au moins la partie proximale du cylindre intermédiaire et est conçu pour recevoir les cylindres coulissants dans son extrémité distale. Un fil déclencheur est relié au cylindre intérieur à partir duquel il s'étend de manière proximale à travers l'introducteur allongé. Ledit fil déclencheur est conçu pour provoquer un mouvement de coulissement axial des cylindres coulissants pendant l'application d'une force audit fil. Un organe de retenue est associé à chaque cylindre coulissant pour en retenir le mouvement au cours de l'application de force au fil déclencheur. Enfin, un organe de déverrouillage est décrit pour déverrouiller les organes de retenue associés à un des cylindres coulissants lors de l'application de la force de traction. Le cylindre coulissant déverrouillé coulisse sous l'action de la force d'entraînement appliquée tandis qu'une extrémité distale d'un des cylindres intermédiaires ou extérieur pousse l'anneau de ligature loin de celui-ci. Selon la présente construction, au moins deux anneaux de ligature peuvent être distribués indépendamment l'un de l'autre sur des tissus, à un ou plusieurs sites désignés, en réalisant ainsi la ligature.

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