Patent ID: 6432110
Filing Date: 2002-08-13
Classification: A61B,A61F

Abstract:
Modular trial instrumentation for determining the dimensions of a replacement prosthesis to be surgically implanted in the medullary canal of a bone of an individual patient during an operation to implant the replacement prosthesis, the modular trial instrumentation comprising:(a) a plurality of trial head components of different dimensions, each of the trial head components including a quick disconnect mating connection portion; the quick disconnect mating connection portion of each trial head component including a female portion having a cavity and a spring loaded locking mechanism; the spring loaded locking mechanism of the quick disconnect mating connection portion of each trial head component having a locked position and an unlocked position; the spring loaded locking mechanism of the quick disconnect mating connection portion of each trial head component being normally urged to the locked position and being movable from the locked position to the unlocked position by hand without additional tools; (b) a plurality of trial stem components of different dimensions, each of the trial stem components defining a longitudinal axis and including a tip portion and a quick disconnect portion longitudinally opposed from the tip portion, the tip portion adapted to be received within the medullary canal of a bone, the quick disconnect portion of each trial stem component including a male portion having a transverse groove; and (c) a trial intermediate component for allowing selected combinations of trial head components and trial stem components to be readily attached relative to one another and detached from one another by hand without additional tools to produce a custom trial prosthesis in the operating room by selecting different trial head components and trial stem components to meet the estimated requirements of the individual patient and by selectively altering the dimensions of the custom trial prosthesis during the operation using various combinations of trial head components and trial stem components to substantially meet the exact requirements of the individual patient; the trial intermediate component including a male portion for extending into the female portion of a selected trial head component, the male portion of the trial intermediate component having a transverse groove for engagement by the spring loaded mechanism of the quick disconnect mating connection portion of the selected trial head component to lock the selected trial head component to the trial intermediate component when the male portion of the trial intermediate component is extended into the female portion of the selected trial head component and the spring loaded locking mechanism of the quick disconnect mating connection portion of the selected trial head component is in the locked position; the trial intermediate component including a female portion having a cavity for receiving the male portion of a selected trial stem component; the female portion of the trial intermediate component including a spring loaded locking mechanism having a locked position and an unlocked position; the spring loaded locking mechanism of the female portion of the trial intermediate component being normally urged to the locked position and being movable from the locked position to the unlocked position by hand without additional tools; the spring loaded locking mechanism of the female portion of the trial intermediate component engaging the groove of the male portion of the selected trial stem component to lock the selected trial stem component to the trial intermediate component when the male portion of the selected trial stem component is extended into the female portion of the trial intermediate component and the spring loaded locking mechanism of the trial intermediate component is in the locked position.