2results about How to "Reduce stress shielding" patented technology

The present application relates to the technical field of orthopedic fixation devices, and specifically discloses an internal fixation device for lumbar facet joint minimally invasive fixation and fusion, which comprises rotationally connected upper anchoring parts, lower anchoring parts and connecting parts. The upper anchoring parts and the lower anchoring parts are respectively attached to the upper and lower articular process bone surfaces of adjacent vertebral bodies, and are respectively provided with lamina notches and inner wall anti-displacement structures to improve the initial implant stability. The connecting parts are all equipped with compression locking structures to achieve stable fixation of the articular process joints. At the same time, the device is provided with reinforced fixation buckles matched with the clamping grooves to further improve the fixation effect. The present application adopts a minimally invasive low-profile design, causes little damage to soft tissues, concentrates the fixation path, effectively reduces bone stress shielding, and can also rely on the matching structure to improve the bone integration and bone fusion efficiency, accurately solves the articular process joint source pain, is convenient to operate during the operation, and is suitable for use in lumbar facet joint minimally invasive fusion surgery.

The application discloses a 3D-printed implant with arc-shaped pipelines and a preparation method thereof, which is used for being implanted into an alveolar bone implantation nest of a patient, and the implant comprises a dense core body and a bone bonding part wrapped outside the dense core body; the bone bonding part comprises a first porous part and a second porous part; the first porous part is connected with the top surface of the second porous part; a plurality of arc-shaped pipelines are arranged in the first porous part; the arc-shaped pipelines are provided with openings at two ends and are communicated with the outside through the openings; the arc-shaped pipelines are extended into a cleaning part through the openings to clean the interiors of the arc-shaped pipelines. The interiors of the arc-shaped pipelines can load drugs (such as BMP-2, VEGF, PDGF and the like) to induce the rapid growth of bone tissues. The implant has the characteristics of good strength, matched elastic modulus of the bone bonding part and the patient and easy cleaning. The implant has a wide indication and is suitable for various edentulous patients, especially for the cases of insufficient alveolar bone mass or bone density.