| 摘要 |
A medical retrieval device is disclosed comprising an elongated cylindrical member that includes a continuum of a material, preferably a met al such as stainless steel or nitinol, that forms both the resilient grasping member s of retrieval basket, snare, or grasper forceps, and the proximal portion or sha ft of the device. The elongated cylindrical member can include a metal cannula or soli d rod into which a series of laterally adjacent longitudinal slots are cut or form ed in the distal portion of the elongated cylindrical member to form a plurality of resilient grasping members. These slots may be cut in a spiral configuration to produc e a helical basket. The resilient grasping members in the original compact shape are formed into an enlarged shape to create a workspace volume for the capture, manipulation and/or retrieval of an object within a patient. An external constraining device, such as an outer sheath, is used for introducing of the device and t o compress the resilient grasping members over a calculus or other object into a substantially closed position. An internal actuating member within the passa ge of the elongated cylindrical member can provide an alternative method of openin g and closing the retrieval device.
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