Methods for manufacturing a clip and clip

A - Human Necessities – 61 – B

Patent

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A61B 17/00 (2006.01) A61B 17/064 (2006.01) A61B 17/08 (2006.01)

Patent

CA 2512091

The present invention relates to a method of making clips which can be used to engage body tissue for the purpose of closing wounds. Such clips are generally annular in shape and have radially inwardly extending tines. The present invention first forms a precursor which, in one embodiment, has the tines extending radially outwardly from the annular body and then forms the clip by inverting the precursor such that the tines extend radially inwardly. In an alternate embodiment, the precursor is formed with an over-sized lateral dimension and then compressed inwardly to bring the tines closer together and to reduce the lateral dimension of the precursor. It is preferred to manufacture such clips from a superelastic alloy such as nickel-titanium, in which case the inverted or compressed precursor must be heated and quenched to heat set the clip in its final shape.

L'invention concerne un procédé de fabrication d'agrafes qui peuvent servir à pénétrer un tissu corporel afin de refermer des plaies. Ces agrafes sont généralement de forme annulaire et présentent des dents qui s'étendent dans le sens radial intérieur. Pour commencer, la présente invention permet de former un précurseur qui, dans un mode de réalisation, comprend lesdites dents s'étendant dans le sens radial intérieur à partir du corps annulaire, puis de former l'agrafe en inversant le précurseur de façon que les dents s'étendent dans le sens radial intérieur. Dans une variante, le précurseur est surdimensionné sur le côté, puis comprimé dans le sens intérieur afin de rapprocher les dents et de réduire la dimension latérale du précurseur. De préférence, ces agrafes sont constituées d'un alliage superélastique, tel que le nickel-titane. Dans ce cas le précurseur inversé ou comprimé doit être chauffé et trempé afin de stabiliser thermiquement l'agrafe dans sa forme finale.

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