Bone screw
First Claim
1. A bone screw for use in connecting a bone portion with a connecting member, said bone screw comprising:
- a mounting section disposed at a first end portion of said bone screw for engaging the bone portion; and
a connector section disposed at a second end portion of said bone screw for use in connecting said bone screw with the connecting member;
said mounting section including an external mounting thread convolution having a root portion, a crest portion, a leading flank surface extending between said root and crest portions and facing forwardly in a direction away from said connector section, and a trailing flank surface extending between said crest and root portions and facing rearwardly in a direction towards said connector section, said root portion having an arcuate cross sectional configuration in a radial plane containing the longitudinal central axis of said bone screw, said trailing flank surface sloping rearwardly and outwardly from said root portion to said crest portion, said crest portion of said mounting thread convolution being offset rearwardly of the forwardmost portion of said trailing flank surface by a distance which is less than the radius of curvature of the arcuate root portion of said mounting thread convolution to form a rearwardly facing recess between said crest and root portions of said mounting thread convolution and to form a wide space between adjacent turns of said crest portion of said mounting thread convolution through which bone may project radially inwardly into the space between adjacent turns of said mounting thread convolution on opposite sides of a radial plane extending through the center of curvature of said root portion and perpendicular to the longitudinal central axis of said bone screw to form a solid mounting for said bone screw in the bone.
5 Assignments
0 Petitions
Accused Products
Abstract
A bone screw for use with a connecting member for connecting a bone portion with the connecting member. The bone screw includes an elongate shank having a longitudinal central axis. A first externally threaded portion receives a nut for attaching the connecting member to the bone screw. A second externally threaded portion engages a surface defining an opening in the bone portion to attach the bone screw to the bone portion. A cylindrical body portion is located on the shank intermediate the first and second externally threaded portions. The body portion engages a portion of the surface defining the opening in the bone portion to restrict movement of the bone screw relative to the bone portion in a direction transverse to the longitudinal cental axis of the shank. The body portion blocks effluent from the opening in the one bone portion. A seat portion having a surface located on the body portion adjacent the first externally threaded portion engages the connecting member to establish the axial location of the connecting member along the bone screw.
-
Citations
16 Claims
-
1. A bone screw for use in connecting a bone portion with a connecting member, said bone screw comprising:
-
a mounting section disposed at a first end portion of said bone screw for engaging the bone portion; and a connector section disposed at a second end portion of said bone screw for use in connecting said bone screw with the connecting member; said mounting section including an external mounting thread convolution having a root portion, a crest portion, a leading flank surface extending between said root and crest portions and facing forwardly in a direction away from said connector section, and a trailing flank surface extending between said crest and root portions and facing rearwardly in a direction towards said connector section, said root portion having an arcuate cross sectional configuration in a radial plane containing the longitudinal central axis of said bone screw, said trailing flank surface sloping rearwardly and outwardly from said root portion to said crest portion, said crest portion of said mounting thread convolution being offset rearwardly of the forwardmost portion of said trailing flank surface by a distance which is less than the radius of curvature of the arcuate root portion of said mounting thread convolution to form a rearwardly facing recess between said crest and root portions of said mounting thread convolution and to form a wide space between adjacent turns of said crest portion of said mounting thread convolution through which bone may project radially inwardly into the space between adjacent turns of said mounting thread convolution on opposite sides of a radial plane extending through the center of curvature of said root portion and perpendicular to the longitudinal central axis of said bone screw to form a solid mounting for said bone screw in the bone. - View Dependent Claims (2, 3, 4)
-
-
5. A bone screw for connecting a bone portion with a bone connecting member, said bone screw comprising:
-
an elongated shank having a longitudinal central axis, a first externally threaded portion for receiving an internally threaded nut and a second externally threaded portion for threaded engagement with a surface defining an opening in the bone portion to attach the bone screw to the bone portion; and means integral with said shank and having a transverse cross-section at least equal to the transverse cross-section of the opening in the bone portion for projecting into the opening and for engaging a portion of the surface defining the opening in the bone portion to restrict movement of said bone screw relative to the bone portion in a direction transverse to the longitudinal central axis of said shank and to block effluence from the opening in the bone portion, said means being located intermediate said first externally threaded portion and said second externally threaded portion. - View Dependent Claims (6, 7, 8, 9)
-
-
10. An apparatus comprising:
-
a bone connecting member to be connected with a bone portion; and a bone screw for connecting the bone connecting member with the bone portion, said bone screw comprising; an elongated shank having a longitudinal central axis, a first externally threaded portion for receiving an internally threaded nut and a second externally threaded portion for threaded engagement with a surface defining an opening in the bone portion to attach the bone screw to the bone portion; and means integral with said shank and located intermediate said bone connecting member and said second externally threaded portion for projecting into the opening in the bone portion, said means having a transverse cross-section at least equal to the transverse cross-section of the opening in the bone portion for engaging a portion of the surface defining the opening in the bone portion to restrict movement of said bone screw relative to the bone portion in a direction transverse to the longitudinal central axis of said shank and to block effluence from the opening in the bone portion. - View Dependent Claims (11, 12, 13, 14)
-
-
15. A bone screw for use with a connecting member to connect a bone portion with the connecting member, said bone screw comprising:
-
an elongate shank having a longitudinal central axis, a first externally threaded portion for receiving an internally threaded nut to attach the connecting member to said bone screw and a second externally threaded portion for threaded engagement with a surface defining an opening in the bone portion to attach said bone screw to the bone portion; means integral with said shank for engaging a portion of the surface defining the opening in the bone portion to restrict movement of said bone screw relative to the bone portion in a direction transverse to the longitudinal central axis of said shank and to block effluence from the opening in the bone portion, said engaging means being located intermediate said first externally threaded portion and said second externally threaded portion, said engaging means including a longitudinally extending cylindrical body portion having a diameter substantially equal to the crest diameter of the thread on said second externally threaded portion and a first shoulder portion located between said first externally threaded portion and said body portion, said first shoulder portion having a circular tapering surface with a diameter that increases as said first shoulder portion extends from said body portion toward said first externally threaded portion, the diameter of the circular tapering surface defining said first shoulder portion being greater than the diameter defining said body portion; and a second shoulder portion located intermediate said body portion and said first externally threaded portion and having a circular tapering surface which increases in diameter as said second shoulder portion extends from said first threaded portion toward said body portion, the diameter of the circular tapering surface defining said second shoulder portion being greater than the root diameter of the thread on said first threaded portion.
-
-
16. A bone screw for use with a connecting member for connecting a bone portion with the connecting member, said bone screw comprising:
-
an elongate shank having a longitudinal central axis, a first externally threaded portion for receiving an internally threaded nut to attach the connecting member to said bone screw and a second externally threaded portion for threaded engagement with a surface defining an opening in the bone portion to attach said bone screw to the bone portion; means on said shank and located intermediate said first externally threaded portion and said second externally threaded portion for engaging a portion of the surface defining the opening in the bone portion to restrict movement of said bone screw relative to the bone portion in a direction transverse to the longitudinal central axis of said shank and for blocking effluence from the opening in the bone portion; a seat portion located on said body portion adjacent said first threaded portion having a surface for engaging the connecting member to establish the axial location of the connecting member along said bone screw; and a shoulder portion located intermediate said seat portion and said first externally threaded portion and having a circular tapering surface which increases in diameter as said shoulder portion extends from said first threaded portion toward said seat portion, the diameter of the circular tapering surface defining said shoulder portion being greater than the root diameter of the thread on said first threaded portion.
-
Specification