Corin Limited

Corin Spinal Systems Limited

David Mark Fletcher

Ian James Emslie

Derek Redvers Cooper

Mevlut Sungu

Ian Geoffrey Winson

Prosthesis stem

A pedicle attachment assembly includes a pedicle attachment device having a head. A polyaxial housing has a through bore comprising a base portion and two posts upstanding from the base portion, the posts defining therebetween a slot for receiving a rod. A saddle-shaped element is disposable in the slot and has a part cylindrical recess in an upper surface for engagement in use with the rod. The saddle-shaped element has a convex lower portion for engagement in a complimentary concave recess in an upper surface of the head of the attachment device. The lower surface of the head of the attachment device and the lower end of the through bore in the housing have complementary part spherical surfaces for engagement with one another. A cap assembly is provided for clamping the rod in the housing.

Pedicle attachment assembly

A surgical implant, typically a cervical plate assembly, comprises a plate having at least two apertures and two screw threaded fastening devices for securing the plate to bone. Each aperture in the plate has an annular groove intermediate opposite ends of the aperture and each fastening device comprises an outer screw and an inner plug. The screw has a head at one end, a tip at the other end, an externally threaded shank between the head and the tip and an internal bore extending axially through the head and at least part way into the shank for receiving the inner plug. The head comprises a plurality of resiliently deformable fingers separated by one another by axially extending slits. Each finger has an outwardly projecting rib extending circumferentially of the head intermediate opposite ends of the finger for snap fit engagement in the annular groove of a respective plate aperture. The inner plug is arranged so that when it is inserted into the internal bore of the screw it will prevent contraction of the head of the screw thereby preventing the ribs disengaging from the groove.

Surgical implant

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Gloucestershire, United Kingdom

David Mark Fletcher