US2005251142A1PendingUtilityA1

Distal bone anchors for bone fixation with secondary compression

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Individually held — no corporate assignee on recordPriority: Mar 30, 2001Filed: Jun 20, 2005Published: Nov 10, 2005
Est. expiryMar 30, 2021(expired)· nominal 20-yr term from priority
Inventors:Gerard HoffmannVictor V. CachiaBrad S. Culbert
A61B 17/746A61B 17/8685A61B 17/869A61B 17/68A61B 17/8625A61B 17/744A61B 17/742A61B 17/84
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Claims

Abstract

Disclosed is a bone fracture fixation device, such as for reducing and compressing fractures in the proximal femur. The fixation device includes an elongate body with a helical cancellous bone anchor on a distal end. An axially moveable proximal anchor is carried by the proximal end of the fixation device. The device is rotated into position across the fracture or separation between adjacent bones and into the adjacent bone or bone fragment, and the proximal anchor is distally advanced to apply secondary compression and lock the device into place. The device may also be used for soft tissue attachments.

Claims

exact text as granted — not AI-modified
1 . A femoral neck fracture fixation device, comprising: 
 an elongate body, having a proximal end and a distal end;    a helical anchor on the distal end, the helical anchor being wrapped about a minor diameter and an outer edge of the helical anchor defining an outer boundary;    a first retention structure on the body, proximal to the anchor; and    a proximal anchor, moveably carried by the body,    wherein the proximal anchor is movable in the distal direction with respect to the body and the retention structure resists proximal movement of the proximal anchor with respect to the body.    
     
     
         2 . A femoral neck fracture fixation device as in  claim 1 , wherein the helical flange is wrapped about a central core.  
     
     
         3 . A femoral neck fracture fixation device as in  claim 2 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         4 . A femoral neck fracture fixation device as in  claim 3 , wherein the minor diameter tapers distally.  
     
     
         5 . A femoral neck fracture fixation device as in  claim 3 , wherein at a distal end of the distal anchor the outer boundary tapers.  
     
     
         6 . A femoral neck fracture fixation device as in  claim 3 , wherein the helical flange is a generally flat blade.  
     
     
         7 . A femoral neck fracture fixation device as in  claim 1 , wherein the helical flange comprises at least a first flange, and a second flange.  
     
     
         8 . A femoral neck fracture fixation device as in  claim 8 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         9 . A femoral neck fracture fixation device as in  claim 2 , wherein the central core includes an axial lumen.  
     
     
         10 . A femoral neck fracture fixation device as in  claim 9 , wherein the helical flange comprises at least a first flange, a second flange, and a third flange.  
     
     
         11 . A femoral neck fracture fixation device as in  claim 10 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         12 . A femoral neck fracture fixation device as in  claim 10 , wherein at least the third flange is removed so as to expose the axial lumen.  
     
     
         13 . A femoral neck fracture fixation device as in  claim 12 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         14 . A femoral neck fracture fixation device as in  claim 9 , wherein the central core tapers in a distal direction so as to expose the axial lumen.  
     
     
         15 . A femoral neck fracture fixation device as in  claim 14 , wherein the axial lumen is exposed at approximately a longitudinal center of the distal anchor.  
     
     
         16 . A femoral neck fracture fixation device as in  claim 1 , wherein the helical flange is wrapped about an axial lumen.  
     
     
         17 . A femoral neck fracture fixation device as in  claim 16 , wherein the outer boundary and the minor diameter have a generally cylindrical shape.  
     
     
         18 . A femoral neck fracture fixation device as in  claim 17 , wherein the helical flanges comprises at least a first flange and a second flange spirally wrapped about the axial lumen.  
     
     
         19 . A femoral neck fracture fixation device as in  claim 18 , wherein the first and second flange include sharpened tips.  
     
     
         20 . A femoral neck fracture fixation device as in  claim 9 , wherein minor diameter tapers in a distal direction.  
     
     
         21 . A femoral neck fracture fixation device as in  claim 20 , wherein at a distal end of the distal anchor the minor diameter is approximately equal to zero.  
     
     
         22 . A femoral neck fracture fixation device as in  claim 20 , wherein the outer boundary also tapers in a distal direction.  
     
     
         23 . A femoral neck fracture fixation device as in  claim 1 , wherein the minor diameter is approximately equal to zero.  
     
     
         24 . A femoral neck fracture fixation device as in  claim 23 , wherein the helical flange has a generally V-shaped cross-section.  
     
     
         25 . A femoral neck fracture fixation device as in  claim 23 , wherein the helical flange has a generally rectangular cross-section.  
     
     
         26 . A bone fracture fixation device, comprising: 
 an elongate body having a proximal end and a distal end;    a cancellous bone anchor on the distal end; the cancellous bone anchor comprising a helical flange wrapped about a central core or axial lumen, an outer edge of the helical anchor defining an outer boundary and the central core or axial lumen defining a minor diameter;    a proximal anchor axially movably carried on the body; and    complimentary surface structures in between the body and the proximal anchor that permit advancing the proximal anchor in the distal direction to tighten the fixation device but that resist axial proximal movement of the proximal anchor.    
     
     
         27 . A femoral neck fracture fixation device as in  claim 26 , wherein the helical flange is wrapped about a central core.  
     
     
         28 . A femoral neck fracture fixation device as in  claim 27 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         29 . A femoral neck fracture fixation device as in  claim 28 , wherein at a distal end of the distal anchor the minor diameter tapers.  
     
     
         30 . A femoral neck fracture fixation device as in  claim 28 , wherein at a distal end of the distal anchor the outer boundary tapers.  
     
     
         31 . A femoral neck fracture fixation device as in  claim 28 , wherein the helical flange is a generally flat blade.  
     
     
         32 . A femoral neck fracture fixation device as in  claim 27 , wherein the helical flange comprises at least a first flange and a second flange.  
     
     
         33 . A femoral neck fracture fixation device as in  claim 32 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         34 . A femoral neck fracture fixation device as in  claim 27 , wherein the central core defines an axial lumen.  
     
     
         35 . A femoral neck fracture fixation device as in  claim 34 , wherein the helical flange comprises at least a first flange, a second flange, and a third flange.  
     
     
         36 . A femoral neck fracture fixation device as in  claim 35 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         37 . A femoral neck fracture fixation device as in  claim 35 , wherein at least the third flange is removed so as to expose the axial lumen.  
     
     
         38 . A femoral neck fracture fixation device as in  claim 37 , wherein the outer boundary and the minor diameter are generally cylindrical.  
     
     
         39 . A femoral neck fracture fixation device as in  claim 34 , wherein the central core tapers in a distal direction so as to expose the axial lumen.  
     
     
         40 . A femoral neck fracture fixation device as in  claim 39 , wherein the axial lumen is exposed at approximately a longitudinal center of the distal anchor.  
     
     
         41 . A femoral neck fracture fixation device as in  claim 26 , wherein the helical flange is wrapped about an axial lumen.  
     
     
         42 . A femoral neck fracture fixation device as in  claim 41 , wherein the outer boundary and the minor diameter have a generally cylindrical shape.  
     
     
         43 . A femoral neck fracture fixation device as in  claim 42 , wherein the helical flanges comprises at least a first flange and a second flange spirally wrapped about the axial lumen.  
     
     
         44 . A femoral neck fracture fixation device as in  claim 43 , wherein the first and second flange include sharpened tips.  
     
     
         45 . A femoral neck fracture fixation device as in  claim 34 , wherein minor diameter tapers in a distal direction.  
     
     
         46 . A femoral neck fracture fixation device as in  claim 45 , wherein at a distal end of the distal anchor the minor diameter is approximately equal to zero.  
     
     
         47 . A femoral neck fracture fixation device as in  claim 45 , wherein the outer boundary also tapers in a distal direction.  
     
     
         48 . A femoral neck fracture fixation device as in  claim 26 , wherein the minor diameter is approximately equal to zero.  
     
     
         49 . A femoral neck fracture fixation device as in  claim 48 , wherein the helical flange has a generally V-shaped cross-section.  
     
     
         50 . A femoral neck fracture fixation device as in  claim 48 , wherein the helical flange has a generally rectangular cross-section.  
     
     
         51 . A bone fracture fixation device, comprising: 
 an elongate body, having a proximal end and a distal end;    a helical anchor on the distal end,    a first retention structure on the body, proximal to the anchor; and    a proximal anchor, moveably carried by the body and having a tubular housing, the tubular housing having at least one barb extending radially outwardly from the tubular housing and defining an engagement surface that lies within a plane that is transverse to a longitudinal axis of the tubular housing,    wherein the proximal anchor is movable in the distal direction with respect to the body and the retention structure resists proximal movement of the proximal anchor with respect to the body.    
     
     
         52 . A bone fracture fixation device as in  claim 51 , wherein the proximal anchor includes a flange, which defines a bone contacting surface that generally faces the engagement surface.

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