Trocar including cannula with stepped region

Details Trocar including cannula with stepped region Trocar including cannula with stepped region

A - Human Necessities

61

B

A61B 17/34 (2006.01)

Patent

CA 2212591

A trocar including a cannula with a tubular sleeve having a stepped region thereon is disclosed. The stepped region has a plurality of discrete steps. Each step has a step floor and a step support base tapering radially inwardly from the step floor to an adjacent step floor. When the trocar is inserted through the body wall, and the stepped region of the sleeve of the cannula contacts the body wall, the force required to inadvertently pull the cannula out of the body wall when surgical instruments are withdrawn from the cannula increases. Thus, the tubular sleeve of the cannula increases the retention force of the cannula during surgery. The retention force is increased without appreciably affecting the force required to insert the trocar through the body wall. Additionally, these benefits are achieved without using helical threads or externally mounted stability devices, which add cost, complexity and increased risk of causing unwanted tissue trauma.

Trocart constitué d'une canule munie d'un manchon tubulaire recouvert d'une zone de plusieurs échelons discrets. Chaque échelon possède une paroi inférieure et une base de soutien effilée radialement vers l'intérieur, de la paroi inférieure à une paroi inférieure adjacente. Lorsque le trocart est inséré dans la paroi corporelle et que la zone en échelons du manchon de la canule entre en contact avec cette paroi, plus de force est nécessaire pour retirer par mégarde la canule de la paroi lorsque des instruments chirurgicaux sont enlevés de la canule. Ainsi, le manchon tubulaire de la canule augmente la force de rétention de la canule durant une chirurgie. Cette force de rétention est augmentée sans affecter sensiblement la force requise pour insérer le trocart dans la paroi corporelle. On bénéficie de ces avantages sans avoir recours à des fils hélicoïdaux ni à des dispositifs de stabilisation externes qui entraînent une augmentation des coûts, de la complexité du processus ainsi que des risques de traumatismes pour les tissus.

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