Expansible elastic interspinous process dynamic fixer

Abstract

The invention discloses an expansible elastic interspinous process dynamic fixer, and belongs to a medical human implant for treating a lumbar degenerative disease. The expansible elastic interspinous process dynamic fixer is expansible and integral, is cylindrical when not expanded and dumbbell-shaped after being expanded, and consists of a support part and wing parts on both sides, wherein the support part has a cylindrical structure with certain support force; the wing parts refer to natural transition wing-shaped structures on both sides of the support part; the diameters of the two wing parts are larger than that of the support part; during surgery, the expansible fixer can be used for performing percutaneous puncture or making a small incision when not expanded, is guided to an ideal interspinous process position via a guide wire, can be expanded by using a balloon or an expander, and automatically fits with a spinal process due to the resistance difference among different positions, the support part has an elastic interspinous process fixing function, the wing parts on both sides are used for preventing the fixer from moving, the entire structure is well combined with the spinal process, the entire fixer is automatically limited in an interspinous process and can be matched with interspinous process anatomy after the balloon is extracted. The expansible elastic interspinous process dynamic fixer has the advantages of simple and reliable structure, selectable elasticity and shape change, convenience in implanting and small traumas.

Description

Technical field: [0001] The invention relates to a novel braided shape-memory alloy non-fused interspinous process fixer, which belongs to the orthopedic internal fixation medical device for implantation in the human body. It can be used for mild and moderate lumbar degeneration, huge herniated disc nucleus pulposus, recurrent disc herniation, mild to moderate neurogenic intermittent claudication, degeneration of adjacent intervertebral discs after fusion, intervertebral disc resection of L5 sacralization, isolated Treatment of Modic I lesions. Background technique: [0002] Lumbar degenerative disease (Lumbar degenerative disease, LDD) has always been one of the most common diseases in humans. According to statistics from Hult in the United States, 80% of people will suffer from LDD in their lives. The US National Center for Health Statistics reported that the most common cause of activity restriction under the age of 45 is low back and leg pain caused by LDD. The annual c...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the support part is made of solid material with poor elasticity, so it may cause spinous process fracture when the lumbar spine is extended; the structure is complex, and the connection of each part depends on rivets, which is not only troublesome in operation, but also low in fatigue resistance and reliability

Its disadvantages are: the wings on both sides are rough to clamp the spinous process, and there are round holes for placing rivets, which not only restricts the rotational movement of the lumbar spine, but also easily damages the bone on the side wall of the spinous process when the lumbar spine moves; the "U" shape design is elastic Although it is large, the support force is not enough, and the elasticity is too large to cause fatigue, and the reliability of the system is poor; the supraspinous and interspinous ligaments of the implanted segment need to be removed during implantation, which has a great impact on the stability of the posterior lumbar spine and damages the human body. Big

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