DETAILED DESCRIPTION OF THE DRAWING Referring to FIG.
1, the arthroscopic ankle joint distractor is shown generally at 10.
As shown in FIG.
1, the distractor 10 is assembled as it would be during a surgical procedure.
Reference may be had to FIG.
4 for an illustration of the in vivo placement of the distractor 10.
The distractor 10 comprises a pair of elongated external fixation pins 12, 12', and a pair of jack screw assemblies 14, 14'.
As illustrated in FIG.
1, one external fixation pin 12 is gripped at each end in base members 16, 16' of each jack screw assembly 14, 14'; the other fixation pin 12' is gripped at each end in movable members 18, 18'.
Movable members 18, 18' are provided with bronze bearing inserts 19, 19' through which the threaded jackscrews 20, 20' travel for smooth operation.
The bronze bearing inserts 19, 19' are retained in the moveable members 18, 18' by means of retaining screws 21, 21'.
Movable members 18,18' are driven toward or away from the base members 16,16' on the threaded jackscrews 20, 20' by means of operating knobs 22, 22'.
The operating knobs 22, 22' are provided with cross-holes as at 24, 24' wherein rods, not shown, may be inserted to provide more torque in turning the operating knobs 22, 22'.
Hex recesses 26,26' are provided in the ends 28,28, of the operating knobs 22,22' to allow for turning of the knobs with a screw driver having a hex end.
FIG.
2 shows the distractor from a side view.
Although only those elements of the distractor visible in the side view of FIG.
2 are herein described, it will be appreciated that the following description applies equally to the elements on the other side, one side of the distractor being symmetrical with the other.
As shown in FIG.
2, base member 16 comprises a first block 30 having a first pin receiving groove 32.
A first finger operated set screw 34 set in the first block 30 at an angle .
alpha.
of about 10.
degree.
to the perpendicular P to the screw 20 exerts a clamping force toward the bottom of the groove 32 that securely maintains and positively stops one end of pin 12 in base member 16
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Obesity Surgery 
