Biopsy forceps having detachable handle and distal jaws

A - Human Necessities – 61 – B

Patent

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Details

A61B 10/00 (2006.01) A61B 17/28 (2006.01) F16B 7/18 (2006.01) F16B 21/06 (2006.01) A61B 17/00 (2006.01) F16B 33/02 (2006.01)

Patent

CA 2274868

An endoscopic biopsy forceps instrument includes a distal jaws assembly detachable from a proximal handle assembly. The proximal handle assembly includes a centrally slotted shaft and a spool having a laterally seated cross block which passes through the central slot. The distal jaws assembly includes jaws mounted on a clevis at the distal end of a coil and coupled to a pull wire which extends through the coil to its proximal end. The proximal end of the coil is provided with a connecting sleeve provided with a frustoconical portion having double-helical threads for removably coupling the coil to a shaft having a distal frustoconical portion having double-helical threads. The proximal end of the pull wire is provided with a grooved mating member and the spool is provided with a locking assembly having a spring-biased push button latch for releasably engaging the grooved mating member. The grooved mating member has an elongate cylindrical distal portion, a central cylindrical portion having a relatively larger diameter, a proximal cylindrical grooved portion, and a proximal conical portion having a rounded apex. The elongate distal portion has a bore into which the pull wire is secured. The mating member end of the pull wire can be snapped into the locking assembly and the coil can be quickly and securely coupled to the shaft.

Forceps endoscopique de biopsie comprenant des mâchoires distales détachables d'une poignée proximale. Cette dernière comprend un arbre à fente centrale et une bobine d'enroulement possédant un bloc transversal à siège latéral passant à travers la fente centrale. Les mâchoires distales sont montées sur un maillon d'attache à l'extrémité distale d'une bobine et accouplées à un fil de traction s'étendant à travers la bobine vers son extrémité proximale. L'extrémité proximale de la bobine est pourvue d'un manchon d'accouplement présentant une partie en cône tronqué possédant des filets en double hélice servant à accoupler la bobine de façon amovible à un arbre possédant une partie distale en cône tronqué présentant des filets en double hélice. L'extrémité proximale du fil de traction est pourvue d'un élément correspondant à rainures et la bobine d'enroulement comporte un ensemble de verrouillage possédant un verrou à bouton poussoir sollicité par ressort et conçu pour venir en contact détachable avec l'élément à rainures. Ce dernier présente une partie distale cylindrique allongée, une partie centrale cylindrique dont le diamètre est relativement plus important, une partie proximale cylindrique rainurée et une partie proximale conique à sommet arrondi. La partie distale allongée comporte un perçage dans lequel est fixé le fil de traction. On peut introduire l'extrémité proximale du fil de traction dans l'ensemble de verrouillage et on peut accoupler la bobine à l'arbre rapidement et solidement.

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