Endoscopic multiple sample bioptome with enhanced biting action

A - Human Necessities – 61 – B

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A61B 10/00 (2006.01) A61B 17/28 (2006.01)

Patent

CA 2216554

An endoscopic multiple sample bioptome includes a hollow outer member and an axially displaceable inner member extending therethrough. The proximal ends of the outer and inner members are coupled to an actuator for axially displacing one relative to the other. The distal end of the outer member is coupled to one of a cylinder having a sharp distal edge and a jaw assembly, while the distal end of the inner member is coupled to the other. The jaw assembly includes a pair of opposed, preferably toothed jaw cups each of which is coupled by a resilient arm to a base member. The arms are bent to lie in planes which intersect the axis of the base member and to locate the jaws apart from each other. The base member is mounted inside the cylinder and axial movement of the jaw assembly and cylinder relative to each other draws the arms into the cylinder and brings the jaw cups together in a biting action. The biting action is enhanced according to the invention by arranging the cutting edge of each jaw to lie in a plane which intersects the plane in which the distal portion of the jaw arm lies. The biting action is further enhanced by providing a closing cam on the outer surface of the jaws which is engaged by the cylinder when the jaws are closed. The arrangement of the cutting edges also presents a smooth surface to the interior of an endoscope and the closing cams prevent the sleeve from sliding completely over and off of the jaws.

Biotome endoscopique pour prélèvements d'échantillons multiples comportant un élément extérieur creux dans lequel s'étend un élément intérieur mobile dans le sens axial. Les extrémités proximales des éléments intérieur et extérieur sont reliées à un actionneur les déplaçant axialement l'une par rapport à l'autre. L'extrémité distale de l'élément extérieur est reliée à un cylindre présentant une arête distale tranchante ou à un ensemble mâchoires, tandis que l'extrémité distale de l'élément intérieur est reliée à l'autre. L'ensemble mâchoires comporte une paire de coupelles de mâchoires opposées de préférence dentelées dont chacune est reliée par un bras souple à une base. Les bras sont courbés de manière à se tenir dans des plans coupant l'axe de la base et pour maintenir les mâchoires écartées l'une de l'autre. La base est montée dans le cylindre et les mouvements relatifs de l'ensemble mâchoires et du cylindre tirent les bras dans le cylindre et referment les mâchoires pour mordre. L'effet de morsure est renforcé puisque les arêtes tranchantes des mâchoires se situent dans un plan coupant celui où se trouve la partie distale du bras des mâchoires. Il l'est également par la présence à la surface extérieure des mâchoires d'une came de fermeture qui s'engage dans le cylindre lorsque les mâchoires se referment. Les arêtes tranchantes présentent une surface lisse face à l'intérieur d'un endoscope et les cames de fermeture empêchent le manchon de coulisser sur les mâchoires et de les dépasser.

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