Strain regulating fusion cage for spinal fusion surgery

Details Strain regulating fusion cage for spinal fusion surgery Strain regulating fusion cage for spinal fusion surgery

A - Human Necessities

61

F

A61F 2/44 (2006.01)

Patent

CA 2347261

Intervetebral fusion cage comprising a prismatic, conical or cylindrical cage (1) having A) a central axis (2); B) an upper and lower bone contact surface (3; 4) transverse to said central axis (2); C) a central cavity (5) for receiving bone graft material and extending between said lower contact surface (4) and said upper contact surface (3) through said body (1) defining a circumferential sidewall (10) arranged coaxially to said central axis (2); and D) a plurality of sectorial slots (6; 7; 8; 9) perforating the circumferential sidewall (10) transversely to the central axis (2), whereby E) said slots (6; 7; 8; 9) have a minima width (h1; h2; h3, h4) that upon compressing of the body (1) along the central axis (2) said slots (6; 7; 8; 9) close elastically at the minimal widths (h1; h2; h3; h4) thereby increasing the stiffeness of the cage (1) upon further compression.

L'invention porte sur une cage d'arthrodèse intervertébrale comportant une cage prismatique, conique ou cylindrique (1) présentant: A) un axe central (2); B) des surfaces (3; 4) supérieure et inférieure de contact avec l'os normales audit axe (2); C) une cavité centrale (5) destinée à recevoir un matériau de greffe osseuse et comprise entre ladite surface inférieure (4) et ladite surface supérieure (3) occupant tout le corps de cage (1) et délimitée par une paroi circulaire (10) coaxiale avec l'axe central (2); et D) une série de fentes sectorielles (6; 7; 8; 9) percées dans la paroi circulaire (10) perpendiculairement à l'axe central (2); E) lesdites fentes (6; 7; 8; 9) présentent une largeur minimale (h1; h2; h3, h4) telle que lorsqu'on comprime le corps (1) dans le sens de l'axe central (2), lesdites fentes (6; 7; 8; 9) se referment élastiquement aux largeurs minimales (h1; h2; h3, h4), ce qui accroît la rigidité de la cage (1) sous l'effet de nouvelles compressions.

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