Retraction tube for use with capless pedicle screw
View Patent ↗A retractor system and method for locating and placing a polyaxial screw while substantially simultaneously retracting tissue is shown and described. The retractor has a channel that facilitates introducing a rod into the polyaxial screw. Various embodiments are shown, including one which utilized a reducer for moving the rod in the retractor.
1. A reducer system comprising:
a polyaxial screw receiver having a rod-locking channel; and
an elongated tubular member having a generally helical reducer channel, said elongated tubular member being adapted and configured to mount onto said polyaxial screw receiver;
said generally helical reducer channel receiving a rod and causing said rod to move in said generally helical reducer channel along an axis of said elongated tubular member and toward said rod-locking channel of said polyaxial screw receiver in response to a rotation of said elongated tubular member, an inner diameter at an end of said elongated tubular member being larger than an outer diameter of said polyaxial screw receiver so that said end of elongated tubular member can be situated circumferentially around said polyaxial screw receiver;
said rod-locking channel of said polyaxial screw receiver extending along a channel length from a top of said polyaxial screw receiver toward a bottom of said polyaxial screw receiver;
at least a portion of said elongated tubular member being adapted to extend over and at least partially surround said polyaxial screw receiver so that said end of said elongated tubular member extends past said top of said polyaxial screw receiver towards said bottom of said polyaxial screw receiver along said channel length so that when said generally helical channel receives said rod, said rod is urged to move into said rod-locking channel in response to rotation of said elongated tubular member.
2. The reducer system as recited in claim 1 wherein said generally helical reducer channel is non-linear.
3. The reducer system as recited in claim 1 wherein said reducer channel is helical, said elongated tubular member further comprising a tubular wall having a first cut out area and a second cut out area, said first and second cut out areas being spaced approximately 180 degrees and defining said generally helical reducer channel.
4. The reducer system as recited in claim 1 wherein said elongated tubular member comprises a grip for manually rotating said elongated tubular member.
5. The reducer system as recited in claim 1 wherein said elongated tubular member comprises at least one stop associated with said generally helical reducer channel to prevent over rotation of said elongated tubular member once the rod is captured in a seat of said rod-locking channel or said polyaxial screw receiver.