Front self locking fixing pin plate for lumbar vertebra

Abstract

The present invention relates to internal lumber vertebra fixture and is especially one front locking fixture plate with screws for lumber vertebra. The front locking fixture plate includes fixing plate and fixing screw, and features the fixing plate in the kurtorachic shape and with 2x3 screw holes with fixing screws, and the screws with arc cut in the head and locked with two other screws separately. The present invention has simple structure, high fixing strength, high safety and small operation wound.

Description

1. Technical field [0001] The invention belongs to a medical internal plant device, and relates to an internal fixation device of a lumbar vertebral body, in particular to a self-locking fixation nail plate in front of a lumbar vertebral body. 2. Background technology [0002] Spinal internal fixation is a basic and important technique for treating spinal injuries, especially in the treatment of lumbar injuries. Among the internal fixation devices currently used for the lumbar spine, there are mainly posterior (or rear) fixation devices for the lumbar spine, lateral fixation devices for the lumbar vertebral body, and frontal fixation devices for the lumbar vertebral body. [0003] Various vertebral screw solid devices are commonly used in the lumbar posterior (or rear) fixation device at present, and the lumbar vertebral body is fixed through the connection between the screw and the rod. This type of fixation device has the following defects: (1) the installation of the fix...

AI Technical Summary

Problems solved by technology

This type of fixation device has the following defects: (1) the installation of the fixation device requires extensive stripping and cutting off the muscles and ligaments at the back of the lumbar spine, and often requires the removal of the posterior lumbar spine such as lamina, intervertebral joints and spinous processes due to the need for decompression of the spinal cord and nerves. The internal structure, trauma is large and extensive, and there is a lot of bleeding, with an average of about 1000ml; (2) The positioning technology of screw installation is high, and if there is any deviation, it is easy to damage the spinal cord, nerve root and dural sac, or the fixation is unstable; (3) The anterior column and the middle column of the lumbar spine are supported and fixed, and the screws and rods bear high stress but the fixation strength is limited, and complications such as broken nails, broken rods, and loosening of the fixation are prone to occur; pressure, which can easily lead to the occurrence of complications such as aggravated neurological dysfunction or complete disability

This type of fixation device has the following disadvantages: (1) The installation of this type of fixation device requires extensive cutting of the multi-layered muscles and ligaments on the outside of the abdomen and the side of the back of the waist, and sometimes the lower ribs must be removed. The operation is complicated, technically difficult, and takes a long time , large trauma, heavy bleeding, the average is about 1200ml; (2) This kind of fixation system is only suitable for the injury operation of the lumbar 1 vertebra to the lumbar 3 vertebra, but for the lumbar 4 to sacral 1 vertebra due to the blocking of the ilium wing and the ilium It is difficult to fix the space occupied by the total blood vessels; (3) due to the need for extensive lateral exposure of the vertebral body, it is easy to damage the lumbar paravertebral autonomic nerves and the trunk and branches of the lumbar plexus, resulting in complications of corresponding nerve dysfunction; (4) due to the Unilateral surgical operation makes it difficult to decompress the contralateral nerve root canal and remove the contralateral lumbar lesion

A nail-plate fixation device for the fixation of the long bones of the limbs has the following defects: (1) its design is based on the fixation of the long bones of the limbs, the thread design of the nail is not suitable for the cancellous bone of the lumbar spine, and the shape design of the plate does not conform to the anatomical shape of the lumbar spine; (2) The installation of the nail is basically located on the central axis of the board, and the resistance to torsion and lateral stress is poor; (3) There is no locking structure at the joint between the nail and the board, so that the fixing strength is insufficient, and the nail board is prone to loosening and moving. There is a risk of fatal complications such as rupture of the large prevertebral vessels (abdominal aorta, inferior vena cava, and common iliac vessels, etc.)

Another kind is the PACH nail plate fixation device of French general (international) medical equipment company, and its defect is: (1) only be applicable to the intervertebral fixation of waist 4-5 and waist 5-sacral 1; (2) by two sets The nail plate is fixed, and each set of nail plate is fixed to the upper and lower vertebral bodies by two screws. Because the two sets of nail plates are not connected to each other, their strength against torsional stress is insufficient; (3) There is no joint between the nail and the plate. The firm locking structure is supported and fixed, so the fixing strength of the whole system is insufficient

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