Trochantaric attachment assembly and method of using same

Claim 2

In a trochanteric attachment assembly for reuniting separated bone segments, said assembly having means for drawing the bone segments into tight abutting relationship along an interface, said means comprising a substantially cylindrical shear washer having relatively smooth inner and outer circumferential surfaces and scalloped, oppositely directed, axially extending portions, said scalloped portions including adjacent arcuate concave segments terminating in sharp spikes therebetween adapted to be embedded axially into each bone segment along the interface therebetween, and a bolt member adapted to extend through said first bone segment and said shear washer into said second bone segment, said bolt member including tightening means at one end to cause said bone segments to be drawn into contiguous abutting relationship to one another until said shear washer is fully embedded in said bone segments.

Claim 3

A fastener for joining first and second separated bone segments to positively prevent relative movement therebetween comprising in combination, a shear washer provided with an axial opening therethrough, said shear washer including an annular body and sharpened axially extending portions to facilitate axial insertion of the washer into the bone segments, a bolt member having a shank portion adapted to be embedded in said first bone segment, said bolt passing through the opening in said shear washer and protruding angularly into said second bone segment, said protruding portion of the bolt member having threads on its outer end, and a nut adapted to be screwed onto the threaded end of the bolt to draw the bone segments into tight abutting relationship whereby they are positively prevented from relative movement.

Claim 4

A fastener for joining first and second separated bone segments to positively prevent relative movement therebetween comprising in combination, a shear washer provided with an axial opening therethrough, said shear washer including an annular body and sharpened axially extending portions to facilitate axial insertion of the washer into the bone segments, a bolt member having a shank portion adapted to be embedded in said first bone segment, said bolt passing through the opening in said shear washer and protruding angularly into said second bone segment, said protruding portion of the bolt member having threads on its outer end, and a nut adapted to be screwed onto the threaded end of the bolt to draw the bone segments into tight abutting relationship whereby they are positively prevented from relative movement.

Claim 5

The fastener of claim 2 further including a washer surrounding the bolt and placed between the nut and the second bone segment.

Claim 6

The fastener of claim 3 wherein said washer is serrated along one side so as to be partially embeddable in said second bone segment.

Claim 7

The fastener of claim 4 wherein said bolt includes a central curved portion connecting the protruding portion of the bolt to the shank portion so that the shank portion is angularly related to the protruding portion of the bolt.

Claim 8

Fastener means for joining first and second separated bone segments to positively prevent relative movement therebetween comprising in combination, a shear washer adapted to be embedded in both first and second bone segments along their interface, said shear washer comprising a substantially cylindrical body having axially smooth inner and outer circumferential surfaces, sharpened axially extending oppositely directed portions along the edges of said shear washer, said sharpened portions comprising a plurality of substantially semicircular adjacent arcuate segments, sharp spikes between said arcuate segments, the spikes along one edge being peripherally offset from the spikes along the other edge, a bolt member having a threaded end portion, a forwardly tapering shank portion, and a curved central portion connecting the threaded end portion to the shank portion so that the shank portion is angularly related to the threaded end portion, said shank portion adapted to be embedded in said first bone segment such that the threaded end of the bolt protrudes through the shear washer and outwardly away from the first bone segment for passage through an opening in said second bone segment, a nut threaded onto the bolt to draw the bone segments into tight abutting relationship whereby they are positively prevented from relative movement, and a washer having a serrated edge positioned around the bolt adapted to be between the nut and the second bone segment such that the serrated edge of the washer is at least partially embedded in the second bone segment to positively position the washer relative to the second bone segment.

Claim 9

Fastener means for joining first and second separated bone segments to positively prevent relative movement therebetween comprising in combination, a shear washer adapted to be embedded in both first and second bone segments along their interface, said shear washer comprising a substantially cylindrical body having axially smooth inner and outer circumferential surfaces, sharpened axially extending oppositely directed portions along the edges of said shear washer, said sharpened portions comprising a plurality of substantially semicircular adjacent arcuate segments, sharp spikes between said arcuate segments, the spikes along one edge being peripherally offset from the spikes along the other edge, a bolt member having a threaded end portion, a forwardly tapering shank portion, and a curved central portion connecting the threaded end portion to the shank portion so that the shank portion is angularly related to the threaded end portion, said shank portion adapted to be embedded in said first bone segment such that the threaded end of the bolt protrudes through the shear washer and outwardly away from the first bone segment for passage through an opening in said second bone segment, a nut threaded onto the bolt to draw the bone segments into tight abutting relationship whereby they are positively prevented from relative movement, and a washer having a serrated edge positioned around the bolt adapted to be between the nut and the second bone segment such that the serrated edge of the washer is at least partially embedded in the second bone segment to positively position the washer relative to the second bone segment.