Snarecoil retrieval device for capturing and retrieving a specimen

摘要

A retrieval device for collecting a specimen includes an outer cannula member having an inner lumen and an inner member received within the inner lumen such that the inner member can rotate relative to the outer cannula. The device also includes first and second snarecoil elements that are formed as part of the inner member. Each snarecoil element has an arcuate shape and is attached to an inner surface of the outer cannula. The snarecoil elements being deformable such that rotation of the inner member relative to the outer catheter results in the snarecoil elements collapsing toward a center of the outer cannula member resulting in either the tissue specimen being captured between the two snarecoil elements in one embodiment or being sheared by the two snarecoil elements in another embodiment.

主权项

1. A retrieval device for collecting a specimen comprising:
an outer cannula having an inner lumen; an inner member received within the inner lumen such that the inner member can rotate relative to the outer cannula, the inner member having an inner edge; a first snarecoil element that is formed as part of the inner member and includes an arcuate shaped first section that is connected to the inner edge of the inner member by a second section, the arcuate shaped first section having a free end that is attached to an inner surface of the outer cannula, the first snarecoil element being deformable such that the arcuate shaped first section moves between a rest position where the first section has an arcuate shape and a collapsed position where the first section has a planar shape; and a second snarecoil element that is formed as part of the inner member and includes an arcuate shaped first section that is connected to the inner edge of the inner member by a second section, the arcuate shaped first section having a free end that is attached to an inner surface of the outer cannula, the second snarecoil element being deformable such that the arcuate shaped first section moves between a rest position where the first section has an arcuate shape and a collapsed position where the first section has a planar shape; wherein the first and second snarecoil elements are located opposite one another in the rest position and rotation of the inner tube relative to the outer cannula causes the first and second snarecoil elements to collapse toward a center of the outer cannula and assume the collapsed positions with a space formed therebetween for receiving and capturing the tissue specimen between the collapsed first and second snarecoil elements that are located in parallel planes.