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Surgical instrument

  • US 9,572,590 B2
  • Filed: 10/02/2007
  • Issued: 02/21/2017
  • Est. Priority Date: 10/03/2006
  • Status: Active Grant
First Claim
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1. An instrument for aligning a surgical tool on a femoral head and a femoral neck of a femur, the instrument comprising:

  • a body portion having a threaded post fixed to the body portion and projecting proximally, along a longitudinal axis, from a proximal surface of the body portion,a first arm, and a second arm, the first arm and the second arm each pivotably connected to the body portion via a first fork and a second fork, respectively, extending from opposite sides of the post and fixed to the body portion, each of the first and second arms having a distal portion, a proximal portion, and a coupling portion located between the distal and proximal portions, each of the coupling portions being coupled to one of the opposing forks by a pivot pin, wherein the distal portion of each of the first arm and the second arm is curved along a length of the distal portion forming a concave bone facing surface, a distal end of the distal portion of the second arm including a bifurcated tab including two curved jaw elements for engaging the femoral neck, and a distal end of the distal portion of the first arm including a curved jaw for engaging the femoral neck, the proximal portion of each of the first arm and the second arm including a curved cam surface,the threaded post comprising at least a first bore and a second bore extending therethrough, the first bore having a first longitudinal axis differently aligned from a second longitudinal axis of the second bore, and the first and the second longitudinal axes are differently aligned from the longitudinal axis of the post; and

    a nut having a threaded bore configured to threadably engage the post, the nut including a frustoconical engagement surface that tapers outwardly from the threaded bore, the frustoconical engagement surface configured to engage the curved cam surfaces of the proximal portions of the first and second arms and causes the two curved jaw elements and the curved jaw of the first and second arms to engage a predetermined portion of the femoral neck upon threading the nut along the post,wherein when the first and second arms are clamped on the femoral neck, the first longitudinal axis and the second longitudinal axis converge towards a center portion of the femoral head at a point at a predetermined distance proximate the body portion, the point being located inside the femoral head when the instrument engages the femoral neck.

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