Articulated cavity creator

摘要

Disclosed herein are devices for use through a cannula to create cavities within interior body regions. When deployed, the distal end of several such devices extend beyond the distal end of the catheter and can then be selectively curved into a shaped compression surface that, when articulated, creates a void within the interior body. This compression surface may then be withdrawn back into the cannula for removal and to make way for bone cement that, in certain instances, may be introduced through the same cannula.

主权项

1. An articulated tip assembly for creating a cavity in a body, the articulated tip assembly comprising:
an enclosure having a proximal end and a distal end, the enclosure adapted to change shape; a shaft coupler coupled to the proximal end of the enclosure; a plurality of interconnecting curving elements enclosed within the enclosure and movably coupled to the shaft coupler, each of the plurality of interconnecting curving elements includes a first channel; a tip having: a body portion coupled to the distal end of the enclosure and coupled to the plurality of interconnecting curving elements, a proximal end of the body including a partially-cylindrical convex male portion for operatively coupling with a corresponding partially-cylindrical concave female portion of an adjacent interconnecting curving element; a head at a distal end of the body portion, the head defining a diameter greater than a diameter of the body portion, wherein the head continuously tapers from the distal end of the body portion to a distal edge of the head, the distal edge located at an end of the head opposite the distal end of the body portion; a first channel extending from the body portion into a bore provided in the head, the bore passing through the head from an opening in the partially-cylindrical convex male portion to an opening in a distal end of the head; and a second channel extending from the body into a second bore provided in the head, the second channel including an upper surface, a portion of the upper surface defines a sloped surface extending in a direction away from a centerline of the channel, and an off-center cable fixedly coupled to the tip and passing through the first channel provided in each of the plurality of interconnecting curving elements and the first channel provided in the body of the tip and into the bore provided in the head of the tip, wherein a force applied to the off-center cable causes the plurality of interconnecting curving elements to approximate a curved shape.