Press-On Pedicle Screw Assembly

{
  "publication_number": "US2008140075A1",
  "country": "US",
  "kind": "A1",
  "title": "Press-On Pedicle Screw Assembly",
  "abstract": "A tulip assembly configured to be coupled to a screw head having a first diameter includes a housing, wherein the housing defines an inner diameter configured to engage the first diameter of the screw head. The exemplary inner diameter of the housing being smaller than the first diameter of the screw head.",
  "claims": [
    "1. A tulip assembly configured to be coupled to a screw head having a first diameter, comprising: a housing; wherein said housing defines an inner diameter configured to engage said first diameter of said screw head, said inner diameter being smaller than said first diameter of said screw head.",
    "2. The tulip assembly of claim 1, further comprising a rod coupled to said housing.",
    "3. The tulip assembly of claim 2, wherein said rod is coupled to said housing by a fastener.",
    "4. The tulip assembly of claim 2, wherein said rod is coupled to an outer surface of said housing.",
    "5. The tulip assembly of claim 1: wherein said housing includes a first inner diameter and a second inner diameter, said first inner diameter being configured to provide a provisional lock when engaged with said first diameter of said screw head; and wherein said second inner diameter is configured to provide a permanent lock when engaged with said first diameter of said screw head.",
    "6. The tulip assembly of claim 5, wherein said permanent lock withstands removal forces of at least 200 inch pounds.",
    "7. The tulip assembly of claim 1, wherein engagement of said screw head having a first diameter into said inner diameter of said housing creates an interference fit sufficient to maintain said housing on said screw head in the presence of removal forces of at least 200 inch pounds.",
    "8. The tulip assembly of claim 1, wherein said inner diameter of said housing is defined by an insert coupled to said housing.",
    "9. The tulip assembly of claim 1, wherein said housing comprises one of a titanium, a cobalt chrome alloy, or a nickel titanium alloy.",
    "10. The tulip assembly of claim 1, wherein said housing comprises: a vertical wall; said vertical wall defining an orifice configured to receive a rod; an upper portion of said vertical wall defining a fastener orifice, said fastener orifice being positions tangential to said orifice configured to receive a rod; and a fastener configured to selectively engage said fastener orifice.",
    "11. A screw head coupling assembly configured to be coupled to a screw head having a first diameter, comprising: a housing; wherein said housing includes a first housing diameter configured to engage said first diameter of said screw head, said first housing diameter being configured to generate an interference fit with said first screw head diameter.",
    "12. The screw head coupling assembly of claim 11, wherein said first housing diameter comprises an inner diameter and said first screw head diameter comprises an outer diameter.",
    "13. The screw head coupling assembly of claim 12, wherein said screw head further comprises a second outer diameter, said second screw head diameter being larger than said first screw head diameter; wherein said first screw head diameter is configured to generate a provisional lock when engaged with said first housing diameter; and wherein said second screw head diameter is configured to generate a final lock when engaged with said first housing diameter.",
    "14. The screw head coupling assembly of claim 12, wherein said housing further comprises a second internal housing diameter, said second housing diameter being smaller than said first housing diameter; wherein said first housing diameter is configured to generate a provisional lock when engaged with said first screw head diameter; and wherein said second housing diameter is configured to generate a final lock when engaged with said first screw head diameter.",
    "15. The screw head coupling assembly of claim 11, wherein said first housing diameter comprises an outer diameter and said first screw head diameter comprises an inner diameter.",
    "16. The screw head coupling assembly of claim 15, wherein said screw head further comprises a second internal diameter, said second screw head diameter being smaller than said first screw head diameter; wherein said first screw head diameter is configured to generate a provisional lock when engaged with said first housing diameter; and wherein said second screw head diameter is configured to generate a final lock when engaged with said first housing diameter.",
    "17. The screw head coupling assembly of claim 15, wherein said housing further comprises a second external housing diameter, said second housing diameter being larger than said first housing diameter; wherein said first housing diameter is configured to generate a provisional lock when engaged with said first screw head diameter; and wherein said second housing diameter is configured to generate a final lock when engaged with said first screw head diameter.",
    "18. The screw head coupling assembly of claim 11, further comprising a rod coupled to said housing.",
    "19. The screw head coupling assembly of claim 18, wherein said rod is coupled to said housing by a fastener.",
    "20. The screw head coupling assembly of claim 18, wherein said rod is coupled to an outer surface of said housing.",
    "21. A tulip assembly configured to be coupled to a screw head having a first diameter, comprising: a housing; a rod coupled to said housing; wherein said housing includes a first inner diameter and a second inner diameter, said first inner diameter being configured to provide a provisional interference fit when engaged with said first diameter of said screw head; and wherein said second inner diameter is configured to provide a permanent interference fit when engaged with said first diameter of said screw head; wherein said permanent lock withstands removal forces of at least 200 inch pounds."
  ],
  "cpc": [
    "A61B 17/7007",
    "A61B 17/7001",
    "A61B 17/7035"
  ],
  "assignees": [
    "ENSIGN MICHAEL D",
    "HAWKES DAVID T"
  ],
  "filing_date": "2007-12-07",
  "publication_date": "2008-06-12",
  "priority_date": "2006-12-07",
  "application_number": "US-95270907-A",
  "family_id": "39492634",
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