SYSTEM FOR BONE FIXATION Russian patent published in 2018 - IPC A61B17/80 

FIELD: medicine.

SUBSTANCE: bone fixation system of the first embodiment comprises a bone implant and at least one bone fixation element. The bone implant is extended in the longitudinal direction. The bone implant contains an implant hull, which is formed by the upper surface and the surface facing bone, which is distant from the upper surface in the transverse direction perpendicular to the longitudinal direction, and at least one hole that goes through the implant in the transverse direction. The said at least one hole is formed by an inner wall. The inner wall is formed by the first and second wire portion, and a portion of the inner wall is bent in the transverse direction to create an outer surface having a convex shape. The inner wall comprises the first threaded portion on the outer surface having a convex shape. The bone fixation element is configured to at least partially insert into the underlying bone through at least one hole. The bone fixation element forms a proximal end and a distal end remote from the proximal end along the central axis in the distal direction. The bone fixation element forms a head located at the proximal end and a stem extending from the head towards the distal end. The head forms the first rib, the second rib that is distant from the first rib in the distal direction, and the groove without thread located between the first and second ribs. The groove is recessed into the head in the direction of the central axis between the first and second ribs. The groove is configured to hold at least a portion of the inner wall so that the first and second ribs connect the bone fixation element and the bone implant. The first edge is convex relative to the central axis and has the vertex of the first edge. The second rib is convex relative to the central axis and has an outer surface of the second rib comprising the second threaded portion that is threadably engaged with the first threaded portion. The bone fixation element is made with a possibility of insertion into the mentioned at least one hole so that the second threaded portion is disengaged from the first threaded portion and is remote in the distal direction. The first threaded portion is adjacent to the groove and is distally remote from the first rib vertex. The bone fixation element for bone implant connection to the bone forms a proximal end and a distal end remote from the proximal end along the central axis in the distal direction. The bone fixation element comprises a bone fixation element hull having a head located at the proximal end and a stem extending from the head towards the distal end. The head forms the first rib, the second rib that is distant from the first rib in the distal direction, and the groove located between the first and second ribs. The groove is recessed into the head in the direction of the central axis between the first and second ribs. The groove has a transverse length and has no thread along the length, and is performed with a possibility of retaining at least part of the bone implant to attach the bone fixation element to the bone implant. The first edge is convex relative to the central axis and has the vertex of the first edge. The first rib has no thread. The second rib is convex relative to the central axis and has an outer surface of the second rib comprising a threaded portion of the second rib. The bone fixation system of the second embodiment comprises a bone implant and a plurality of bone fixation elements. The bone implant defines the first end and the second end spaced from the first end in the longitudinal direction. The bone implant comprises an implant hull that defines an upper surface and a surface facing the bone that is remote from the upper surface in the transverse direction that is perpendicular to the longitudinal direction. The bone implant comprises the first and the second wire portion. Each of the first and second wire portions is bent longitudinally and has an inner wall. The inner wall of the first and second wire portions forms a plurality of holes, each extending through the implant hull. A part of the inner wall of each of the first and second wire portions that specify each of the plurality of holes, is curved in the transverse direction to form a convex outer surface, with the first threaded portion, extending in the transverse direction. The bone fixation element is configured to at least partially insert into the underlying bone through one hole. Each bone fixation element forms a proximal end and a distal end remote from the proximal end along the central axis in the distal direction. Each bone fixation element forms a bone fixation hull with a head located at the proximal end and a stem extending from the head towards the distal end. The head forms the first rib and the second rib that is distant from the first rib in the distal direction, and the groove without thread located between the first and second ribs. The groove is recessed into the head in the direction of the central axis between the first and second ribs. The groove is configured to receive at least a portion of the inner wall to secure the bone fixation element to the bone implant. The first rib of each bone fixation element is convex relative to the central axis and has the vertex of the first rib. The second rib of each bone fixation element is convex relative to the central axis and has an outer surface of the second rib comprising the second threaded portion that is threadably engaged with the first threaded portion. The bone fixation element is made with a possibility of insertion into at least one hole so that the second threaded portion is disengaged from the first threaded portion and is remote in the distal direction. The first threaded portion is adjacent to the threadless groove and is distally remote from the first rib vertex.

EFFECT: bone implant retaining in the desired position in a specific area of the tissue.

21 cl, 9 dwg