ARTHROMEDULAR IMPLANTS (OPTIONS) Russian patent published in 2021 - IPC A61B17/56 A61M1/00 

FIELD: medicine, trauma care and orthopedics.

SUBSTANCE: arthromedullary implant for joints according to the first version is made of a bioinert material with or without coating on the surface in contact with the bone, characterized by the fact that the cannulated implant body is equipped at one end with a curved tube, and at the other end with a thread and at the threaded end with two recesses for instrument for screwing / unscrewing into bone tissue. In the body of the implant, there are two through cylindrical channels of different diameters. The channels are offset relative to the central axis of the housing. The channel of a smaller diameter is made with the possibility of accumulation and removal of the gaseous medium from the articular cavity into the intraosseous space and, together with the curved tube, is a gas outlet channel having a large length. The other canal has a shorter length, is made with perforation of the walls and is an arthromedullary canal for the patient's own bone marrow, including bone fat and mesenchymal precursor cells of cartilage tissue, from the intraosseous space into the articular cavity, while the difference in the lengths of the gas outlet canal and the arthromedullary canal creates in them the difference in hydrostatic pressure, which contributes to the entry of the patient's own bone marrow into the articular cavity through the arthromedullary canal with the alignment of intraosseous and intraarticular pressure. The arthromedullary implant for joints according to the second version is made of a bioinert material with or without coating on the surface in contact with the bone, characterized by the fact that the cannulated implant body is equipped at one end with a straight tube, and at the other end with a thread and at the threaded end with two recesses for instrument for screwing / unscrewing into bone tissue. There are two through channels in the implant body. One of the channels is cylindrical in shape with the ability to accumulate and remove the gaseous medium from the articular cavity into the intraosseous space and, together with the straight tube, is a long-length gas outlet channel. Another canal is made with an offset relative to the central axis of the body, has a shorter length and is an arthromedullary canal having the shape of a ring sector in cross-section. The walls of the arthromedullary canal are made with perforation of the walls to allow the patient's own bone marrow, including bone fat and mesenchymal precursor cells of cartilage tissue, to enter the articular cavity from the intraosseous space into the articular cavity, while the difference in the lengths of the gas duct and arthromedullary canal creates a difference in hydrostatic pressure in them, which contributes to entry into the articular cavity through the arthromedullary canals of the patient's own bone marrow and with the equalization of intraosseous and intraarticular pressure.

EFFECT: invention provides a decrease or disappearance of pain, improved healing, prevention of obliteration, improved lubricity of synovial fluid, etc.

16 cl, 1 tbl, 10 dwg