Closure for open ended medical implant and removal tool

A closure for an open ended medical implant having a pair of spaced and internally threaded arms;

• said closure comprising:
• a) a closure body having a partial cylindrical shape with at least one outer portion of uniform radius removed;
• and
• b) said body having a radially outer surface that is threaded with a discontinuous thread.

A closure for an open ended medical implant;

• said closure comprising;
• b) a closure body having a pair of opposed cylindrical sectors with each of said sectors having radially outward curved surfaces with a first radius and with threads thereon sized and shaped to threadably mate with threads of the medical implant;
• said sector threads being discontinuous with each other;
• said sectors being joined by curved walls having an outer second radius that is less than said first radius.

A medical implant system comprising:

• a) a medical implant having an open channel positioned between a pair of arms and being sized and shaped to receive a rod member;
• said arms being spaced and having threaded internal facing surfaces;
• b) a closure body having a radially outward discontinuous threaded surface having a first radius joined by a curved wall having a second radius less than said first radius;
• said closure body having an axially aligned pass through threaded bore;
• and
• c) a threaded set screw operably received in said bore during installation and being sized and shaped to have a tip extending from said bore when fully installed.

A tool for removing a closure threadedly received between a pair of arms of an implant under torque;

• said tool comprising:
• a) a shaft having an operator turning handle at one end and a head at an opposite end thereof;
• b) said head having a channel sized and shaped to receive such a closure and a pair of wings on either side of said channel;
• and
• c) each of said wings having an outer cam surface that has a nonuniform radius, so that said tool is positionable over such a closure and rotatable such that said cam surfaces engage and wedge apart arms of the implant.