Locking device for fixation mechanism of medical implant

摘要

A device for locking a bone fastening or fixation mechanism in a receiving member of a medical implant (corpectomy cage or cervical cage). The locking mechanism is kept in place (both in its locked and unlocked positions) using a retaining mechanism. The retaining mechanism also provides predetermined locked and unlocked positions that are readily moved to by the practitioner and maintained in position once placed there.

主权项

1. A medical implant comprising:
(a) a receiving member body that comprises a first fastener opening, wherein the first fastener opening is operable for allowing a first fastener to be inserted through the first fastener opening for fixing the medical implant to bone; (b) a locking mechanism located near the first fastener opening, wherein
(i) the locking mechanism comprises a rotating block cover operable to move between an unlocked position and a locked position,(ii) when the rotating block cover is in the unlocked position, the first fastener can be inserted through the first fastening opening,(iii) when the rotating block cover is in the locked position, a portion of the rotating block cover is covering the first fastener opening to prevent the first fastener for moving through the first fastener opening and which locks the first fastener in place; (c) a retaining mechanism that comprises an engagement body rotatably coupled to at least two retaining levers, wherein
(i) the engagement body is attached to the rotating block cover,(ii) the engagement body is operable for moving rotatably relative to the retaining levers while remaining in contact with the retaining levers,(iii) the engagement body is operable for moving in a first direction to a first position, wherein
(A) when the engagement body is in the first position, the locking mechanism is in the unlocked position,(B) the engagement body is blocked from rotating past the first position when moved in the first direction, and(C) the engagement body is retained in the first position by the application of opposing rotational forces by the retaining levers such that the engagement body cannot move without the application of a force in a second direction that is opposite to the first direction, and(iv) the engagement body is operable for moving in a second direction to a second position, wherein
(A) when the engagement body is in the second position, the locking mechanism is in the locked position,(B) the engagement body is blocked from rotating past the second position when moved in the second direction, and(C) the engagement body is retained in the second position by the application of opposing rotational forces by the retaining levers such that the engagement body cannot move without the application of a force in the first direction; and (d) wherein the medical implant is a cage.