[ii] 4,190,044 [45] Feb. 26, 1980
[54] TELESCOPING INTERMEDULLARY PIN
[76] Inventor: Eugene W. Wood, P. O. Box 672, Magnolia, Ark. 71753
[21] Appl. No.: 933,990
[22] Filed: Aug. 16,1978
[51] Int. C1.2 A61F 5/04; A61B 17/18
[52] U.S. CI 128/92 BC
[58] Field of Search 128/92 BC, 92 B, 92 BA,
128/92 R, 92 G
[56] References Cited
U.S. PATENT DOCUMENTS
2,672,861 3/1954 Jonas et al 128/92 BC
2,985,168 5/1961 Jonas et al 128/92 R X
4,016,874 4/1977 Maffei et al 128/92 BC
FOREIGN PATENT DOCUMENTS 741970 11/1943 Fed. Rep. of Germany 128/92 BC
Primary Examiner—Ronald L. Frinks
Attorney, Agent, or Firm—Clarence A. O'Brien; Harvey
B. Jacobson
[57] ABSTRACT
The device provides the surgeon with an intermedullary pin for the repair of bone fractures. The pin has a main body or base which is inserted in a drilled out marrow cavity of one-half of the broken bone. A portion of the marrow of the cooperating half of the broken bone is drilled out also to accept the telescoping plunger which is positioned in the base. The two halves of the bone are brought together and the telescopic plunger is forced from the base into the drilled out marrow cavity by a stainless steel wire which is connected to the bottom of the telescoping pin and extends out of the bone cavity through the fracture. When the plunger is extended to its desired length, the stainless steel wire is cut and removed from the bone. The telescoping plunger is held against return to the interior of the base by a series of ridges spaced longitudinally along the body of the plunger which cooperate with faces of the resilient side walls of the base which prevent the reinsertion of the plunger into the base by providing an obstacle against which the ridges abut when return force is applied to the plunger.
9 Claims, 16 Drawing Figures
