Devices and methods for treating bone tissue

Abstract

The present disclosure relates to devices for injecting material into a body. The devices include a housing having a deployment cannula extending therefrom. The device also includes a rotary drive member wherein rotational movement of the drive member relative to the housing results in linear movement of an elongated injection member within a lumen of and out of a distal end opening of the deployment cannula. The elongated injection member includes a proximal end portion that may have a Tuohy-Huber tip and/or varying radii therealong.

1 .- 25 . (canceled) 
     
     
         26 . A medical needle, comprising:
 an elongated tubular shaft having a proximal end portion, a distal end portion and a lumen extending from an opening in the proximal end portion to an opening in the distal end portion, at least the distal end portion of the elongated shaft having an unconstrained arcuate configuration defined by different radii of curvature along a curve of the distal end portion of the elongated shaft, and the opening in the distal end portion defined by a flat surface located at a distal tip of the elongated shaft; and   at least the distal end portion of the cannula being movable between a constrained substantially linear configuration that is constrained by an external constraining force and arcuate unconstrained configuration, when the external straining force is released.   
     
     
         27 . The medical needle of  claim 26  wherein the external constraining force comprises a deployment cannula. 
     
     
         28 . The medical needle of  claim 26  wherein the proximal end opening of the elongated shaft is in fluid communication with an injectable material. 
     
     
         29 . The medical needle of  claim 26  wherein the elongated tubular shaft comprises a Tuohy or Huber needle. 
     
     
         30 . The medical needle of  claim 26  wherein the at least the distal end portion of the elongated shaft comprises shape memory material. 
     
     
         31 . The medical needle of  claim 26  wherein a distal section of the distal end portion of the elongated shaft in the unconstrained arcuate configuration has a radius of curvature that is smaller than the radius of curvature of a more proximal section of the distal end portion.