Transpedicular latch

 

The invention relates to medicine, in particular of traumatology and orthopedics. The invention provides increase the stability of the structure as a whole and the strength of “weak” areas and reduce the likelihood of deformation or destruction of the structure elements ahead of time necessary for complete rehabilitation of the patient. Transpedicular latch contains screws, longitudinal rods and two transverse rods that are interconnected. In the screw head made a hole under the longitudinal rod. The hole in the screw has a slotted cuts. The longitudinal rod is made along the edges of the slotted cutting. Both of the transverse rod are threaded and connected to the longitudinal rods with clamps with nut elements. The clamps made two holes, one of which is threaded. The screws are fixed with longitudinal rods through a prolonged screws. 2 C.p. f-crystals, 1 Il.

The invention relates to medicine, in particular of traumatology and orthopedics. The latch is designed for fixation of adjacent vertebrae is damaged, which is necessary for the formation of a solid block locked vertebrae, in case the of cracks.

Known transpedicular tabs firm Medtronic Sofamor Danec containing screws, longitudinal steering, transverse rod, the locking screws. Design retainer firm Medtronic does not fully meet the requirements of the pins and implants. So the possibility of rotation of the screw in the hub connection with a longitudinal rod, illustrated prospectus radius of rotation, may adversely impact the rehabilitation process. Also not exclude the possibility of rotating the screw about the axis of the longitudinal rod. With regard to the transverse rod, he made a very massive that jeopardizes one of the first rules of trauma - "minimum intervention in the human body". The threads on the screws are made throughout the screw, until the sections close to the nodal connection with a longitudinal rod, and it is this section of the screw is the most loaded.

Known transpedicular tabs Usikov C. D. containing screws, longitudinal bars, transverse plate. Longitudinal rods copyright clamps Usikov Century. Etc. are weakened from the point of view of mechanics, because they have cuts around the circumference, which may lead to microcracks and reduces the stability of the structure, and having a single transverse plate does not lead to a high increase in the rigidity of the whole construction.

Known latch containing the screws, the longitudinal rods and two transverse rods that are interconnected in the screw head made a hole under the longitudinal rod (U.S. Pat. 5702392 USA, IPC7And 61 In 17/70, publ. 1997).

The lack of threads in the transverse rods rigid fastening of the longitudinal and transverse rods increases the probability of failure of structural elements.

The task, which is aimed by the invention, is the creation of the clamp, ensuring stabilization of the damaged area of the spine to the time required for complete rehabilitation of the patient and does not require additional external immobilization.

When carrying out the invention the problem is solved at the expense of achieving a technical result, which is to increase the rigidity on the "weak" areas and to eliminate the stress, thus decreasing the probability of failure of structural elements. This is achieved by changing the geometric characteristics of transpedicular latch and the location of the individual elementclassname the latch, containing screws, longitudinal rods and two transverse rods that are interconnected, and the screw head made a hole under the longitudinal rod, the feature is that the hole in the screw has a slotted cuts, and the longitudinal rod is made along the edges of the slotted cuts, both of the transverse rod are threaded and connected to the longitudinal rods with clamps with nut elements, clamps made two holes, one of which is threaded, the screws are fixed with longitudinal rods through a prolonged screws. Moreover, the profile of the spline has a triangular shape, and the latch has four valve element.

Between the claimed technical result and essential features of the invention have the following cause-and-effect relationship. Both of the transverse rod are threaded throughout and are connected by longitudinal rods with clamps, which has two holes. In one of the holes of the clip threaded, which reduces the required number of valve elements twice, from 8 to 4 pieces In these openings are transverse rods. The clamp is clamped with the aid of wrench elements.

As a result, when received the data of the structural elements relative to each other, achieved a high increase in the rigidity of the design on the "weak" areas. Eliminated the stress concentrators described above, resulting in a reduced probability of failure of structural elements.

Slotted screw connection with a longitudinal rod completely eliminates the possibility of rotating the screw 1 around the longitudinal axis of the rod. Profile spline has a triangular shape, resulting in a dense planting details.

The execution of the screws in the sections close to the nodal connection with the rod, in the form of a bucket with a smooth release of the full thread can significantly reduce the stress concentration in the most loaded sections of the screws. The radius of the bucket 20 mm, which increases the strength of the screw.

All components are made from titanium alloy.

The presence of two transverse rods allows you to form a closed loop, which significantly increases the rigidity of the structure as a whole and reduces the load on the longitudinal rods. At the same time on both the transverse rods thread made throughout their length.

The location of the transverse rods as close to the top and bottom screws, respectively, reduces the strain on the longitudinal sternradio, allows rigid fixation of the longitudinal and transverse rods relative to each other.

The invention is illustrated in the drawing, which shows the latch Assembly.

In the clip containing the screws 1, the longitudinal rods 2, the transverse rods 3, the clamps 4, locking screw 5 and nut elements 6 in the screw head 1 has a hole having a slotted cuts, while the screw 1 in the sections close to the nodal connection with longitudinal rod 2 made in the form of fillets, having a radius of curvature of 20 mm, in addition, the screw 1 has a smooth release of the full thread. The longitudinal rods 2 are also slotted cutting edges. The transverse rods 3 are threaded the entire length. The clamp includes a clamp 4, each of which has a series of holes, and in one of them threaded, locking screw 5 and nut elements 6. All components are made from titanium alloy.

The latch set as follows. In the vertebrae adjacent to the damaged, enter the two screws 1. On the longitudinal rods 2 install two clamp 4. After that, the longitudinal rods 2 are installed in the screw holes 1. Due to the protracted screws 5 is achieved by rigid fastening of the screw 1 with a longitudinal rod 2, and in this moment of achievement is around the longitudinal axis of the rod 2. The transverse rod 3 is screwed into the clamp 4 and fix the longitudinal rod 2 with the cross rod 3 is as close as possible to the top and bottom screws 1, respectively, to the extent which allows the human anatomy, with the help of wrench elements 6. Thus formed 2 longitudinal and transverse 3 terminals, closed loop significantly increases the strength of the structure as a whole and reduces the load on the longitudinal rods 2.

As a result, a metal structure is able to fix the damaged area of the spine for the entire period of rehabilitation including mutual arrangement of the vertebrae relative to each other, which it deems necessary traumatologist.

Sources of information

1. Mikhailovsky, M. C., N. Fomichev.G. Surgery of spinal deformity. - Novosibirsk: Sib. Univ. in, 2002. S. 322.

2. Antennae C. D. Device for peliculasporno reposition and fixation Grodno-lumbar-sacral spine: leaflet // Medical technologies in Russia. 4C.

3. Pat. 5702392 USA, IPC7And 61 In 17/70, publ. 1997 (prototype).

Claims

1. Transpedicular the latch containing the screws, the longitudinal rods and two transverse ster fact, the hole in the screw has a slotted cuts, and the longitudinal rod is made along the edges of the slotted cuts, both of the transverse rod are threaded and connected to the longitudinal rods with clamps with nut elements, clamps made two holes, one of which is threaded, the screws are fixed with longitudinal rods through a prolonged screws.

2. The latch on p. 1, characterized in that the profile of the spline has a triangular shape.

3. The latch on p. 1, characterized in that it has four valve element.



 

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