Endoscopic biopsy needle with coil sheath

摘要

A notched tissue-collection needle configured similarly to a fine-needle-aspiration needle is provided with a cutting edge disposed in the notch and configured to excise tissue into the notch for collection. A stylet may be provided through a lumen of the needle during introduction into a patient body. The needle may be provided with echogenicity-enhancing features. A coated-wire sheath through which the needle is slidably disposed includes an overcoating that is thicker along a distal length and thinner along a proximal length.

主权项

1. A biopsy needle assembly configured to collect histological samples via a surgical visualization device, the assembly comprising:
an elongate notched needle cannula including a distal notch open through the elongate notched needle cannula to a longitudinal needle lumen, which longitudinal needle lumen extends through the elongate notched needle cannula; and an elongate sheath; where the elongate sheath comprises a longitudinal sheath lumen through which the elongate notched needle cannula is slidably disposed; where the elongate sheath includes a generally cylindrical body defining the longitudinal sheath lumen, the generally cylindrical body including:
a coiled coated-wire tube extending proximally from a distal body end, wherein the coiled coated-wire tube includes a plurality of adjacent coils;a sheath overcoating around the coiled coated-wire tube; and where the coiled coated-wire tube has a substantially consistent outer diameter along an entire length of the coiled coated-wire tube, the elongate notched needle cannula has a substantially consistent outer diameter along an entire length of the elongate notched needle cannula, and the sheath overcoating includes a first thickness along a distal sheath length, the sheath overcoating includes a second thickness along a proximal sheath length, and where the first thickness is greater than the second thickness such that the first thickness causes an outer diameter of the distal sheath length to be larger than an outer diameter of the proximal sheath length, wherein the sheath overcoating is in contact with and extends contiguously between the plurality of adjacent coils along the distal sheath length and along the proximal sheath length.