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US 5,314,426 AGranted
External bone fixation device
OwnerAnthony P. Pohl, Bruce H. Ideinventors
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OwnerAnthony P. Pohl, Bruce H. Ideinventors
Estimating the term…
The invention relates to a unilateral external bone fixation device which can be readily adapted for carrying out either bone transport or bone lengthening procedures, the device comprising a non-rotatable rigid shaft 11 having a central bore 12 extending therethrough, and being longitudinally displaceable along the central axis of the device, and a plurality of clamp carrier housings 13, 14 15 co-axially supported along the length of the shaft 11, one of the housings 14 being fixed to the shaft so as to be movable therewith, each said housing having connected thereto an orthopedic pin clamp assembly, a lead screw 19 housed within the bore of the shaft 11, and having a thread mating with a thread in the shaft bore, arranged and constructed so that upon rotation of the lead screw 19, the shaft 11 is displaced longitudinally along with the housing 14, to in turn cause an adjustment in the axial distances between the confronting ends of the housing 14 and at least one of the housings 13,15. In the bone transport mode of use, housings 13, 15 remain fixed with respect to the lead screw 19, whilst in the bone lengthening more of use, only one housing 13 is held fixed with respect to the lead screw, the two other housings 14,15 moving, upon adjusted rotation of the lead screw, in unison with the shaft.
An improved unilateral external bone fixation device having a central longitudinal axis, comprising a central non-rotatable rigid shaft or rod having a central bore extending therethrough and being longitudinally displaceable along the axis of the device, first, second and third clamp carrier housings co-axially supported along the length of the shaft or rod, the second housing being the intermediate one of said housings and being fixed to the shaft so as to be movable therewith, each said housing being adapted to support an orthopedic pin clamp assembly for removably securing one or more fixator retainer pins therein, a lead screw housed within the bore of the shaft or rod and having a thread mating with a thread in the shaft bore, said lead screw being rotatable from one end thereof, and adjustment means for adjusting the axial distance between confronting ends of said intermediate housing and at least one of the other housings, said adjustment means arranged and constructed so that rotation of the lead screw imparts longitudinal displacement to said shaft and also to said intermediate housing fast therewith relative to said at least one of the other housings.
Dependencies are inferred from the claim text.