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Compression bone screw device

  • US 7,135,023 B2
  • Filed: 07/02/2004
  • Issued: 11/14/2006
  • Est. Priority Date: 07/07/2003
  • Status: Expired due to Fees
First Claim
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1. A constant compression bone screw comprising:

  • An elongate outer member having a first end and a second end defining an elongate bore and a longitudinal axis,an inner member positioned in the elongate bore along the longitudinal axis having a first end and second end,means engagable with the inner member and the outer member for resisting axial separation of the inner member with respect to the outer member along the longitudinal axis comprising a first channel in the inner member and a second channel in the outer member distant from the first channel along the longitudinal axis and a seal positioned in the first channel and the second channel between the inner member and the outer member defining a sealed chamber positioned between the inner member and the outer member, andmeans for preventing rotation of the inner member with respect to the outer member about the longitudinal axis.

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