Tip articulation mechanism for endoscopes

A - Human Necessities – 61 – B

Patent

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A61B 1/00 (2006.01) A61B 1/005 (2006.01)

Patent

CA 2084691

A pulling wire for tip articulation mechanism of endoscope is fitted with an overload preventing spring in the middle thereof. This spring is arranged to stretch upon more than a certain amount of tension. Elongation of the overload preventing spring absorbs any excessive tension which is exerted upon the pulling wire as a result of motion restriction of the endoscope. This spring is fabricated such that the material wire thereof is spirally coiled, and is simultaneously twisted so that forcing pressure is introduced in the spring in the direction in which the adjoining ring portions thereof are brought into pressure contact with one another it is subjected to tension.

L'invention porte sur un fil de traction, pour un mécanisme d'articulation de la pointe d'un endoscope, qui comporte en son milieu un ressort empêchant la surcharge. Le ressort est disposé de façon à s'étirer davantage uq'en réponse à une certaine traction. L'allongement du ressort en question permet d'absorber tout excès de traction exercée sur le fil, excès qui résulte d'une restriction de mouvement de l'endoscope. Le ressort est fabriqué de manière à ce que la matière fil dont il est composé soit enroulée en spirale et torsadée. Ainsi, le ressort est soumis à une traction lorsqu'une pression s'exerce sur lui dans le sens dans lequel sont réunies ses bagues avoisinantes

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