초록 ▼

A method and apparatus for extracting a prosthesis, particularly a femoral component of a hip prosthesis, which is embedded in a skeletal bone. The apparatus of this invention includes a hollow housing having a lower bearing surface which bears against the proximal end of the bone surrounding the pr

A method and apparatus for extracting a prosthesis, particularly a femoral component of a hip prosthesis, which is embedded in a skeletal bone. The apparatus of this invention includes a hollow housing having a lower bearing surface which bears against the proximal end of the bone surrounding the prosthesis to be extracted, a threaded shaft having one end extending into the housing, means mounted externally of the housing which can be rotated to axially advance the shaft and means disposed on the one end of the shaft disposed within the housing for grasping the prosthesis for extraction thereof. A bearing plate may be provided between the proximal end of the skeletal bone and the bearing surface of the housing to evenly distribute the reaction forces applied by the housing over the exposed surface of the proximal end of the bone, and for a cemented prosthesis, over the exposed bone and cement surfaces. This bearing plate may be provided with any desired angle of slope with respect to the proximal end of the bone. Rotation of the threaded shaft causes a controlled, continuous extraction force to be applied to the component to smoothly and slowly break the bonds between the component and the bone or between the component and cement.

대표청구항 ▼

Apparatus for extracting the stemmed component of a prosthesis from a bone in which it is implanted, said apparatus comprising: a housing having a first end and a bearing surface disposed at a second thereof spaced from said first end, said bearing surface being adapted to bear against a proximal en

Apparatus for extracting the stemmed component of a prosthesis from a bone in which it is implanted, said apparatus comprising: a housing having a first end and a bearing surface disposed at a second thereof spaced from said first end, said bearing surface being adapted to bear against a proximal end of the bone surrounding the prosthesis; a shaft slidably and nonrotatably disposed with respect to said housing, said shaft having a first end disposed within said housing; means disposed on said first end of said shaft for grasping the stemmed component; and means threadably coupled to said shaft and adapted to be rotated with respect to said shaft for axially moving said shaft with respect to said second end of said housing and for applying a continuous, controlled force to the stemmed component directed away from the proximal end of the bone generally in the direction of elongation of the component to pull the component away from the bone when the component is grasped by said grasping means.