SPIRAL CUT BIOPSY CANNULA

摘要

Disclosed is an instrument useful for taking tissue samples from human or animal patients that includes a cannula or other similar elongate body cooperating with a stylet or similar device coaxially positioned within the cannula such that the cannula and stylet are useful for capturing and excising tissue. The cannula body includes at least one flexing region having one or more slits disposed in a generally helical slit pattern arranged around and along the cannula. Methods for taking tissue samples from a patient are also disclosed including navigating the cannula and stylet through various internal structures of the patient's body where the flexing region aids to avoid binding between the cannula and the stylet during the procedure.

主权项

1. A biopsy instrument, comprising:
a cannula including:
an elongate cannula body having a proximal end, a distal end, and a cannula body wall defining a cannula lumen within the elongate cannula body, the cannula lumen having a lumen width;a cutting surface at the distal end of the elongate cannula body;at least one flexing region having one or more slits defined by the cannula body wall and arranged in a generally helical slit pattern extending circumferentially around and longitudinally along the elongate cannula body; a tissue collector including:
an elongate collector body coaxially receivable within the cannula lumen;a tissue receiving opening defined by the elongate collector body and disposed near a collector distal end of the elongate collector body; anda penetrating member at the collector distal end of the elongate collector body distal to the tissue receiving opening.