Compression bone screw

• US 7,044,953 B2
• Filed: 02/27/2003
• Issued: 05/16/2006
• Est. Priority Date: 02/27/2003
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Stryker Leibinger GmbH & Co. KG (Stryker Corporation)
• Inventors: Capanni, Felix
• Primary Examiner(s): Robert, Eduardo C.
• Assistant Examiner(s): REIMERS, ANNETTE R
• Application Number:
  US10/375,665
• Publication Number:
  US 20040172031A1
• Time in Patent Office: 1,174 Days
• Field of Search: 606/63, 606/65, 606/72, 606/73
• US Class Current: 606/309
• CPC Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts

Abstract

A compression bone screw is described, with a shank having two opposite shank sections along its axial extent, a first thread being connected in a rotationally fixed manner to the shank in the region of the first shank section. The shank has at least one latching element for rotatably coupling a threaded component bearing a second thread to the second shank section. The invention furthermore relates to a screwdriver blade for the compression bone screw.

Claims

1. A compression bone screw, comprising;

a shank having opposite first and second shank sections along its axial extent with a first thread being connected in a rotationally fixed manner to the shank in the region of the first shank section,

a threaded component bearing a second thread and the second shank section being designed for rotatable reception of the threaded component, and

a snap ring separate from the shank and threaded component and radially expandable for fitting onto the shank to couple the threaded component to the shank.

2. A compression bone screw according to claim 1 wherein the shank defines a radially outward indentation for latching reception of the snap ring and the threaded component defines a radially inward indentation for latching reception of the snap ring.

3. A compression bone screw according to claim 1 wherein the snap ring is disposed radially between the shank and the threaded component and prevents relative axial movement between the shank and the threaded component.

4. A compression bone screw, comprising;

a shank having opposite first and second shank sections along its axial extent with a first thread being connected in a rotationally fixed manner to the shank in the region of the first shank section,

a threaded component bearing a second dread and the second shank section being designed for rotatable reception of the threaded component, and

a snap ring radially expandable for fitting onto the shank to couple the threaded component to the shank and prevent relative axial movement between the threaded component and the shank.

5. A compression bone screw according to claim 4 wherein the shank defines a radially outward indentation for latching reception of the snap ring and the threaded component defines a radially inward indentation for latching reception of the snap ring.