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Bone fastener and method of installing same

  • US 4,711,232 A
  • Filed: 12/23/1985
  • Issued: 12/08/1987
  • Est. Priority Date: 07/12/1985
  • Status: Expired due to Fees
First Claim
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1. In a combination comprising a fastener and a threaded bore in a bone in which the fastener is anchored, the fastener being utilizable with hard and soft bones and comprising:

  • a screw having a substantially cylindrical outer surface formed with a helical srewthread, the screw having at its screwthread a thread diameter and between the turns of the thread at the surface a root diameter smaller than the thread diameter; and

    an anchor sleeve of a resilient synthetic resin, defining and extending along an axis, normally fitted in the bore, of an outside diameter corresonding generally to the diameter of the bore, and havingan outer end formed with an outwardly open polygonal-section recess,an inner end formed with an inwardly open and transversely throughgoing slot,an outer end portion of an inside diameter greater than the root diameter but smaller than the thread diameter,an inner end portion of an inside diameter smaller than the root diameter, andan external helicoidal screwthread extending about two-thirds of the length of the sleeve from its inner end toward its outer end,the screwthread of the sleeve having a rounded outer edge and the outer surface being rounded between the turns thereof.

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