Access and tissue modification systems and methods

Abstract

Described herein are methods and systems for precisely placing and/or manipulating devices within the body by first positioning a guidewire or pullwire through the body from a first location, around a curved pathway, and out of the body through a second location, so that the distal and proximal ends of the guidewire extend from the body, then pulling a device into position using the guidewire. The device to be positioned within the body is coupled to the proximal end of the guidewire, and the device is pulled into the body by pulling on the distal end of the guidewire that extends from the body. The device may be bimanually manipulated by pulling the guidewire distally, and an attachment to the device that extends proximally, allowing control of both the proximal and the distal ends. In this manner devices (and particularly implants such as innerspinous distracters, stimulating leads, and disc slings) may be positioned and/or manipulated within the body. Devices to modify tissue may also be positioned or manipulated so that a target tissue within the body is modified.

1 . A method of placing an inner spinous distractor within a body using a pullwire having a tissue-penetrating distal end and a proximal end, the method comprising:
 extending a pullwire across an inner spinous ligament between two spinous processes so that the proximal end of the pullwire extends from a first position outside of the body, and the distal end of the pull wire extends from a second position outside of the body; and   pulling the distal end of the pullwire to pull a spinous process distractor from the first position into the inner spinous ligament between the two spinous processes.   
     
     
         2 . The method of  claim 1 , further comprising coupling the proximal end of the pullwire to a distal end of the spinous process distractor. 
     
     
         3 . The method of  claim 1 , further comprising coupling the proximal end of the pullwire to a distal end of a spinous process distractor delivery device. 
     
     
         4 . The method of  claim 1 , wherein the step of extending the pullwire comprises percutaneously passing the pullwire through the body from a first opening in the body at the first position to a second opening in body at the second position. 
     
     
         5 . The method of  claim 1 , further comprising detaching the distal end of the pullwire from the spinous process distractor. 
     
     
         6 . The method of  claim 1 , further comprising pulling a sizer between the two spinous processes using the pullwire. 
     
     
         7 . The method of  claim 1 , further comprising locking the spinous process distractor in position between the two spinous processes. 
     
     
         8 . The method of  claim 1 , further comprising expanding the spinous processes distractor. 
     
     
         9 . The method of  claim 1 , further wherein the step of extending a pullwire comprises inserting a curved, cannulated probe between the spinous processes and passing the pullwire through the cannulated probe to extend from the distal end and out of the second opening out of the body. 
     
     
         10 . A method of placing an inner spinous distractor within a body using a pullwire having a tissue-penetrating distal end and a proximal end, the method comprising:
 inserting a curved, cannulated probe between two spinous processes so that the tip of the probe extends in a curved pathway through the inner spinous ligament;   extending a pullwire through the probe so that a distal end of the pullwire extends out of the body while the proximal end extends from the body proximally;   removing the probe while leaving the pullwire in position across the spinous ligament; and   pulling the distal end of the pullwire to pull a spinous process distractor between the two spinous processes.   
     
     
         11 . An system for inner spinous distraction, the system comprising:
 an inner spinous distractor configured to be pulled into position through the inner spinous ligament between two spinous processes and to distract the two spinous processes;   a pullwire having a tissue-penetrating distal end and a coupler at the proximal end, the coupler configured to couple to the inner spinous distractor so that the pullwire may be used to pull the inner spinous distractor into position; and   a cannulated probe having a curved distal end, the probe configured to position the pullwire between two spinous processes.   
     
     
         12 . The system of  claim 11 , further comprising a sizer configured to couple to the proximal end of the pullwire so that it can be pulled between two spinous processes. 
     
     
         13 . The system of  claim 11 , further comprising a distal handle configured to attach to the distal end of the pullwire and to secure the tissue-penetrating distal end of the pullwire. 
     
     
         14 . The system of  claim 11 , further comprising an inner spinous distractor delivery tool configured to hold the inner spinous distractor for delivery between two spinous processes, wherein the distal end of the delivery tool comprises a coupler for coupling to the proximal end of the pullwire and the proximal end of the inner spinous distractor delivery tool comprises a proximal handle. 
     
     
         15 . The system of  claim 11 , further comprising a lock for securing the inner spinous distractor in position between two spinous processes.