Threaded insert for bone plate screw hole
DCFirst Claim
1. A one piece locking insert for connecting a bone screw to a bone plate having at least one hole with an angled lower surface,the insert comprising upper and lower sections, and a central screw hole through said upper and lower sections, said central screw hole being threaded in at least said lower section,said upper section having an upwardly facing surface for engaging a bone screw head, and a downward facing locking surface for contacting a top edge of the bone plate hole, andsaid lower section having retaining means for contacting the angled lower surface of the bone plate hole.
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Accused Products
Abstract
A threaded insert is designed to snap into a standard bone plate hole. The insert has an upper section divided into sectors by slots, a lower section having deflectable tabs with external projections, and a central threaded hole. When a standard bone screw is tightened in the insert, the insert rigidly fixes the screw to the plate by collapsing the threads of the insert onto the threads of the screw, and by expanding the sectors of the upper section to clamp the bone plate.
261 Citations
25 Claims
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1. A one piece locking insert for connecting a bone screw to a bone plate having at least one hole with an angled lower surface,
the insert comprising upper and lower sections, and a central screw hole through said upper and lower sections, said central screw hole being threaded in at least said lower section, said upper section having an upwardly facing surface for engaging a bone screw head, and a downward facing locking surface for contacting a top edge of the bone plate hole, and said lower section having retaining means for contacting the angled lower surface of the bone plate hole.
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9. A one piece locking insert for connecting a bone screw to a bone plate having at least one hole with angled upper and lower surfaces,
the insert comprising an upper section, a lower section and a central screw hole through said upper and lower sections, said hole being threaded in at least said lower section, said upper section being divided into a plurality of expandable sectors by a plurality of slots, said sectors having upwardly facing surfaces for engaging a bone screw head, and downwardly facing locking surfaces for contacting the angled upper surface of the bone plate hole, and said lower section having retaining means for contacting the angled lower surface of the bone plate hole.
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11. A locking insert for connecting a bone screw to a bone plate having at least one hole with an angled lower surface,
the insert comprising an upper section, a lower section and a central screw hole through said upper and lower sections, said central screw hole being threaded in at least said lower section, said upper section having an upwardly facing surface for engaging a bone screw head, and a downward facing locking surface for contacting a top edge of the bone plate hole, and said lower section having a compressible structure, and at least one projection for contacting the angled lower surface of the bone plate hole.
- 16. An assembly for internal fixation of bones comprising a bone plate having a plate hole with an upward facing countersunk surface and a downward facing undercut chamfer, in combination with a one piece insert for fixing a bone screw in said plate hole, said insert comprising a central threaded hole for the bone screw, a locking surface for clamping over said countersunk surface and a projection for engagement with said undercut chamfer.
- 20. An assembly for internal fixation of a bone comprising a bone plate having a plate hole with an upward facing countersunk surface and a downward facing undercut chamfer, in combination with a one piece insert for connecting a bone screw to said plate, said insert comprising an upper section, a lower section and a central screw hole through said upper and lower sections, said hole being threaded in at least said lower section, said upper section having an upwardly facing surface for engaging a bone screw head and a downwardly facing locking surface for contacting the upward facing countersunk surface of said bone plate hole.
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22. An assembly for internal fixation of bones comprising
a bone plate having at least one plate hole between the outer surface and the inner, bone-contacting surface, said plate hole having a smaller diameter in a section between said surfaces that at either surface, a one-piece, locking insert for connecting a bone screw to said plate, said insert comprising an upper section engaging said plate in said hole above its smaller dimension, a lower section capable of passing through said smaller diameter section of said plate hole and engaging said plate in said hole below its smaller dimension and a central hole through said upper and lower sections, said central hole being threaded in at least said lower section, and a threaded bone screw passing through said central hole, engaging the threaded portion of said central hole and pressing said insert against said plate above the smaller diameter section in said plate hole.
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25. A one piece, locking insert for connecting a bone screw to a bone plate having at least one plate hole between the outer surface and the inner, bone-contacting surface, said plate hole having a smaller diameter in a section between said surfaces than at either surface,
said one piece insert comprising an upper section for engaging said plate in said hole above its smaller dimension, a lower section capable of passing through said smaller diameter section of said plate hole and engaging said plate in said hole below its smaller dimension and a central hole through said upper and lower sections, said central hole being threaded in at least said lower section for engaging a threaded bone screw passing through said central hole and pressing said insert against said plate above the smaller diameter section in said plate hole.
Specification