Improved interference screw having increased upper diameter

A - Human Necessities – 61 – B

Patent

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Details

A61B 17/86 (2006.01) A61F 2/00 (2006.01) A61F 2/08 (2006.01)

Patent

CA 2407108

An interference screw for affixing soft tissue grafts during anterior cruciate ligament (ACL) reconstruction comprises a threaded body axially extending between a face and a tip along a central axis, with the face advantageously being obliquely aligned with the central axis. The threaded body includes a proximal threaded section and a distal threaded section, each of which may be straight or tapered. The proximal threaded section is approximately 1 mm larger in diameter than the distal threaded section. The increased diameter of the proximal threaded section enables the interference screw to compressively secure the soft tissue graft against the cortical bone, while the distal threaded section compresses the soft tissue graft against the cancellous bone with an appropriately reduced force that is appropriate for facilitating bonding of the soft tissue graft to the cancellous bone and that is sufficient for minimizing any "bungee effect."

Il s'agit d'une vis orthopédique destinée à fixer des greffes de tissu mou pendant la reconstruction d'un ligament croisé antérieur (LCA) et comprenant un corps fileté qui s'étend axialement entre une face et une pointe le long d'un axe central, la face étant avantageusement alignée de façon oblique avec l'axe central. Le corps fileté comprend une section filetée proximale et une partie filetée distale, dont chacune peut être droite ou conique. La partie filetée proximale est d'un diamètre supérieur d'environ 1 mm à celui de la section filetée distale. Le diamètre accru de la partie filetée proximale permet à la vis orthopédique à fixer par compression la greffe de tissu mou contre l'os cortical, alors que la partie distale filetée comprime la greffe de tissu mou contre l'os spongieux avec une force réduite de façon appropriée pour faciliter la liaison de la greffe de tissu mou à l'os spongieux et de façon suffisante pour minimiser tout « effet élastique ».

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