4results about How to "Reduce stress shielding" patented technology

The present invention discloses a nested assembly type internal fixation device for the outer side of the tibial plateau, comprising a titanium alloy steel plate, a proximal absorbable module and a top pressure reduction locking absorbable rod, a window top pressure reduction area corresponding to the collapsed area of ​​the tibial plateau articular surface is provided on the titanium alloy steel plate close to the lateral bone surface of the tibia, a steel plate proximal locking hole is provided on the proximal side of the window top pressure reduction area, and a steel plate sliding pressurizing hole is provided on the distal side; a proximal absorbable module is embedded and installed in the window top pressure reduction area, an absorbable polylactic acid ring is embedded in the proximal module micro-motion hole on the proximal absorbable module, the top pressure reduction locking absorbable rod is driven into the collapsed area of ​​the tibial plateau articular surface through the proximal module micro-motion hole, and the tail of the top pressure reduction locking absorbable rod is threadedly connected with the absorbable polylactic acid ring, so as to realize micro-motion connection and lock the proximal absorbable module to maintain top pressure reduction. The internal fixation device of the present invention is patient-friendly, can be customized, is convenient for window top pressure reduction of the articular surface and effectively maintains fixation.

The invention relates to a static-dynamic fixation bone fracture plate, which belongs to a medical fracture internal fixation bone fracture plate and is characterized in that any one to four of a high-thread screw, an elastic plate, a conical bulge and an absorbable cushion block are selected to be combined for use according to different fracture parts. The elastic plate is in a shoulder pole shape and is of a low-stress shielding structure between high-thread screw holes. The thread of the high-thread screw has the design of cutting bones, preventing fracture caused by stress concentration and micro-motion; the conical bulge has the effects of suspended fixation of fracture and gradually-changed low-stress shielding; the absorbable cushion block is degraded and absorbed, so that the stress shielding effect of the screw is gradually reduced. The device has the advantages that each component has the function of reducing stress shielding of the bone fracture plate to bones, static-dynamic automatic conversion fixation can be achieved, permutation and combination of different components have different degrees and functions, multiple component structures are compounded, complementation and reinforcement functions are achieved, the micro-motion effect of dynamic fixation is more reliable, and rapid fracture rehabilitation is achieved.

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.