US 8,771,324 B2Granted

Securing fasteners

AssigneeGlobus Medical, Inc.

InventorsMichael Black, Matthew Hansell, Jon Suh

Life of this patent

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Abstract

A fastener, for example a bone screw, is sized to pass into an aperture of an implant, for example a bone plate, the fastener having an anchor portion engageable with body tissue, and a head portion formed by an assembly of an insert and an anchor extension. The implant has an aperture with a reduced entry dimension. The insert and anchor extension cooperate to form a reduced dimension passable into the aperture, and an expanded dimension not passable out of the aperture. The size of the assembly is configurable by bending resilient tabs of the anchor extension or the implant, using ramped surfaces, or an expanding diameter of a threadable insert.

Claims18

Dependent claims

A fastener for securing body tissue relative to an implant, the implant having an aperture with a narrowed entry portion, the fastener comprising:

an anchor portion configured for passing through the aperture and attaching to body tissue;
a head portion extending from the anchor portion;
and
an insert at least partially received within the head portion,
wherein the head portion includes at least one gapped region and at least one ungapped region,
wherein the insert includes at least one resilient tab dimensioned to occupy at least a portion of the at least one ungapped region,
wherein the insert forms a first dimension sized larger than a dimension of the narrowed entry portion, the at least one resilient tabs bendable allowing the insert to form a second reduced dimension relative to the first dimension, the insert passable past the narrowed entry portion and into the aperture when the tab forms the second dimension
wherein the insert includes a first retainer provided with a flange with a gapped region to resiliently bend or deflect to pass over a second retainer located on the head portion.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/117,379Filed 27 May 2011
Published: US 2012/0303071 A129 Nov 2012
Granted: 8 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

A61B 17/8038
Having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges…:…
A61B 17/8047
Having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges…:…
A61B 17/8057
Immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded: the interlocking form comprising a thread
A61B 17/8605
Pins or screws or threaded wires; nuts therefor: heads, i.e. proximal ends projecting from bone

Family

US 2012/0303071 A1Pre-grant publication · published 29 Nov 2012
US 8,771,324 B2This patent

From the US filing history. Foreign family members aren’t listed.

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