CN106551734A - The lumbar intervertebral fusion fixing device that a kind of automatic screw is fixed - Google Patents

Abstract

The invention discloses the lumbar intervertebral fusion fixing device that a kind of automatic screw is fixed, including：The fixture of the body of one PEEK materials and a titanium alloy material, the fixture are connected with the tail end of body, the development part of a titanium alloy material on body, and at the 1.0～1.5mm of front end of body, in imaging process as structure tag.The lumbar intervertebral fusion fixing device that the automatic screw of the present invention is fixed can be used for minimally invasive passage and insert, including side approach Lumbar Fusion fixation (DLIF) and diagonally forward approach Lumbar Fusion fixation (OLIF), the lumbar intervertebral fusion fixing device that the automatic screw is fixed can connect body and fixture is inserted together, prevent unnecessary displacement, fixation, insert together, shorten operating time, operating difficulty is reduced, is damaged in reducing the art of patient.

Description

An automatic screw-fixed lumbar intervertebral fusion fixation device

technical field

The invention belongs to the technical field of medical devices, and in particular relates to an automatic screw-fixed lumbar intervertebral fusion fixation device.

Background technique

Lumbar interbody fusion is widely used in lumbar degenerative disc diseases, such as lumbar disc herniation, lumbar spinal stenosis, spondylolisthesis, and lumbar degenerative scoliosis. The more traditional surgical methods include posterior lumbar interbody fusion (TLIF and PLIF) and anterior lumbar interbody fusion (ALIF). Although the posterior fusion surgery has a definite curative effect and a high fusion rate, it still has some shortcomings, such as muscle denervation caused by dissection of the paraspinal muscles and chronic low back pain, adhesion and scarring of tissues inside and outside the spinal canal and around nerve roots, and intervertebral disc The resection range is small, resulting in residual nucleus pulposus tissue and recurrence of lumbar disc herniation. The anterior lumbar interbody fusion also has a high risk due to the interference of various abdominal organs. In recent years, with the development of minimally invasive surgical techniques, lumbar fusion and fixation through minimally invasive channels has become more and more popular, including lateral approach lumbar fusion and fixation (DLIF) and oblique anterior approach lumbar fusion and fixation ( OLIF). For some patients with severe lumbar instability, only fusion cages are placed, which have poor anti-rotation mechanical properties, and displacement of fusion cages may occur, and often need to be used in conjunction with lateral screw rods or nail plates. However, the use of nail-plate or nail-rod auxiliary fixation is difficult to locate and cumbersome to operate. The lumbar nerve often crosses the surface of the implant, which will stimulate the lumbar nerve and cause nerve damage, and it can still be observed in clinical practice that the joint application of nail-rod or nail-plate system Patient has fusion cage displacement.

Contents of the invention

The object of the present invention is to provide an automatic screw-fixed lumbar intervertebral fusion fixation device.

Technical scheme of the present invention is as follows:

An automatic screw-fixed lumbar intervertebral fusion fixation device, comprising:

One body, made of PEEK, the length is consistent with the length of the coronal slope of the human lumbar vertebral body, and the width is 70-80% of the sagittal plane width of the human lumbar vertebral body; the shape of the side wall fits the human anatomy, including one side The front section of the wall, the middle section of the side wall and the rear section of the side wall, the distance between the upper edge and the lower edge of the front section of the side wall gradually decreases from the rear to the axis of the length direction of the front body, and the upper edge and lower edge of the middle section of the side wall They are all arc-shaped with a middle height and two bottoms. The angle between the upper and lower edges of the rear section of the side wall and the coronal horizontal plane of the human lumbar spine is 10-30 degrees; Arranged triangular positioning teeth, the tooth depth of the positioning teeth is 0.8 ~ 1.0mm, the front angle of the above-mentioned triangular positioning teeth is 30 degrees, the rear angle is 60 degrees, and the top angle is 90 degrees; the body has a front through up and down. Aggregate filling cavity and a rear aggregate filling cavity, the front aggregate filling cavity and the rear aggregate filling cavity are separated by a central wall, the two side walls of the front aggregate filling cavity have two front bone graft windows through, and the rear bone The two side walls of the material filling cavity have two through bone grafting windows; a titanium alloy developing part is set on the main body, and is 1.0-1.5 mm away from the front end of the main body, which is used as a structural mark during the imaging process;

A fixing piece, made of titanium alloy, has an upper self-tapping threaded through hole inclined upwards and inwards and a lower self-tapping threaded through hole inclined downwards and inwards, the upper self-tapping threaded through hole and the lower self-tapping threaded through hole The included angle with the horizontal plane is 30±10°, and the included angle with the sagittal plane is 10±2.5°;

The fixing part is connected with the tail end of the body.

In a preferred embodiment of the present invention, the distance between the upper top surface and the rear two edges of the lower bottom surface of the body gradually decreases from front to back along the axis of the length direction of the body.

In a preferred embodiment of the present invention, the length of the body is 30-45mm, and the width is 10-15mm.

Further preferably, the maximum width of the middle section of the side wall is 10 to 15 mm, and the minimum width is less than 10 mm and greater than or equal to 7 mm.

In a preferred embodiment of the present invention, the length of the bone graft window is 4-5 mm, and the width is 3-4 mm.

In a preferred embodiment of the present invention, the length of the rear bone graft window is 4-5 mm, and the width is 3-4 mm.

In a preferred embodiment of the present invention, both the upper self-tapping thread through hole and the lower self-tapping thread through hole are provided with an elastic stopper.

In a preferred embodiment of the present invention, the fixing member is provided with an upper limit blocking piece adapted to the upper self-tapping threaded through hole for embedding into the upper vertebral body.

In a preferred embodiment of the present invention, the fixing member is provided with a lower limit blocking piece adapted to the lower self-tapping threaded through hole for embedding into the lower vertebral body.

In a preferred embodiment of the present invention, the middle part of the fixing member is provided with a slot adapted to hold an instrument.

Beneficial effects of the present invention:

1. The automatic screw-fixed lumbar intervertebral fusion fixation device of the present invention can be used for minimally invasive channel insertion, and the automatic screw-fixed lumbar intervertebral fusion fixation device can be connected to the main body and the fixation piece to prevent unnecessary displacement. Position, fixed firmly, together can also simplify the operation steps, shorten the operation time, reduce the difficulty of operation, and reduce the intraoperative injury of patients.

2. The upper and lower self-tapping threaded through holes of the present invention have elastic limiters, which can be pressed back when the screw is inserted, and pop out again after the screw is completely screwed in, and can be stuck on the outer edge of the head end of the screw to prevent the screw from Withdrawal, reducing the risk of secondary surgery for patients.

3. The middle part of the fixing member is provided with a slot suitable for clamping instruments, which can be combined with an insertion auxiliary tool to facilitate the insertion of the present invention in a minimally invasive channel.

4. The upper top surface and the lower bottom surface of the body of the present invention are provided with triangular positioning teeth arranged continuously from front to back. The front angle of the above-mentioned triangular positioning teeth is 30 degrees, the rear angle is 60 degrees, and the top angle is 90 degrees. , so that it is convenient to reduce the resistance of the insertion of the fusion device, and can also provide initial stability to prevent the fusion device from coming out.

5. The fixing part and the main body of the present invention are integrated into the intervertebral space, and then fixed with self-tapping screws, which avoids the fixing of the nail plate and nail rod system outside the vertebral body, and can achieve zero notch without affecting the Activities near the joints will not damage the surrounding tissues and organs.

6. The present invention can be placed through a lateral or anterior oblique approach under minimally invasive surgery. Compared with traditional surgery, the intervertebral facet joints, spinous processes, interspinous ligaments, and posterior longitudinal ligaments can be preserved to the greatest extent without extensive stripping The lumbar dorsal muscle, in which the oblique anterior approach does not require stripping of the psoas major muscle, does not require intraoperative neurophysiological monitoring, and maintains the physiological and mechanical stability of the lumbar spine. The patient recovers quickly after surgery and the spine is stable.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.

Figure 2 is a side view of the present invention.

Fig. 3 is a top view of the present invention.

detailed description

The technical solutions of the present invention will be further illustrated and described below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figure 1, an automatic screw-fixed lumbar intervertebral fusion fixation device includes a body 1 made of PEEK (polyetheretherketone) and a fixing part 2 made of titanium alloy, the fixing part 2 and the body 1 The tail ends are connected, specifically, the fixing part 2 is connected with the tail end of the body 1 through a slot structure.

As shown in Figures 1 to 3, the main body 1 has a front aggregate filling cavity 11 and a rear aggregate filling cavity 12 that pass through up and down, and the front aggregate filling cavity 11 and the rear aggregate filling cavity 12 pass through a central wall 13 The two side walls of the front aggregate filling cavity 11 have two through bone graft windows 110, the two side walls of the rear aggregate filling cavity 12 have two through bone graft windows 120, the front bone graft windows 110 and the rear bone graft The shape of the bone window 120 is all oval-like (the upper and lower edges of the middle part are parallel, and the two ends are connected by a semicircle), the length is 4-5mm, and the width is 3-4mm, which can provide nutrition for the bone in the present invention. and blood supply to provide good physiological conditions for bone fusion; a titanium alloy developing part 3 is set on the body 2, and is 1.0-1.5 mm away from the front end of the body 2, and is used as a structural marker during the imaging process;

The length of the main body 1 is consistent with the length of the coronal inclined plane of the human lumbar vertebral body, preferably 30-45mm, and the width is 70-80% of the sagittal plane width of the human lumbar vertebral body and is adapted to the width that the minimally invasive channel can accommodate, preferably 10~15mm;

As shown in Figure 2, the shape of the side wall of the main body 1 conforms to the anatomy of the human body, including a front section 14 of a side wall, a middle section 15 of a side wall and a rear section 16 of a side wall, and the upper and lower edges of the front section 14 of the side wall The distance between them is gradually reduced from the rear to the axis of the length direction of the front body 1, and the upper and lower edges of the middle section 15 of the side wall are arc-shaped (the maximum width is 10 to 15mm, the minimum width is less than 10mm and greater than or equal to 7mm), the angle between the upper edge and the lower edge of the posterior section 16 of the side wall and the coronal horizontal plane of the human lumbar spine is 10-30 degrees, which can facilitate the main body to be implanted into the lumbar joint space, with small resistance and easy implantation;

As shown in Figures 1 to 3, the upper top surface and the lower bottom surface of the body 1 are provided with triangular positioning teeth 17 arranged continuously from front to back, and the tooth depth of the positioning teeth 17 is 0.8-1.0 mm. The front angle of the tooth 17 is 30 degrees, the rear angle is 60 degrees, and the top angle is 90 degrees; The axis of the implant gradually narrows, which can also reduce the resistance of implantation and avoid damage to surrounding tissues and organs;

As shown in Figure 1, the fixing member 2 has an upper self-tapping thread through hole 21 inclined upward and inward and a lower self-tapping thread through hole 22 inclined downward and inward, the upper self-tapping thread through hole 21 and the lower self-tapping thread The included angle between the threaded through hole 22 and the horizontal plane is 30±10°, and the included angle with the sagittal plane is 10±2.5°. At the same time, the fixing member 2 is provided with an upper limit for the self-tapping threaded through hole 21 The blocking piece 23 and a lower limiting blocking piece 24 adapted to the lower self-tapping threaded through hole 22, during the implantation process of the present invention, the upper limiting blocking piece 23 and the lower limiting blocking piece 24 can be embedded in the upper and lower vertebral bodies, On the one hand, it prevents the present invention from penetrating too deeply into the vertebral body, and on the other hand, it can increase the anti-rotation stability of the present invention; the upper self-tapping thread through hole 21 and the lower self-tapping thread through hole 22 are provided with an elastic limiter 25 , when the self-tapping screw is inserted, the elastic limiter 25 is squeezed out of place, and resets after the screw is completely screwed in, and can be stuck on the outer edge of the head end of the self-tapping screw to prevent the self-tapping screw from withdrawing. Preferably, The angle of the self-tapping screw relative to the titanium alloy fixing plate is adjustable; in addition, the middle part of the fixing part 2 is also preferably provided with a draw-in slot 26 suitable for clamping instruments, which can be combined with corresponding auxiliary tools to facilitate the minimally invasive operation of the present invention. Channel placement. The preferred diameter of the above-mentioned self-tapping screw is 4mm, the length is 30-40mm, and its cap is in the form of an arcuate surface.

The above is only a preferred embodiment of the present invention, so the scope of the present invention cannot be limited accordingly, that is, equivalent changes and modifications made according to the patent scope of the present invention and the content of the specification should still be covered by the present invention In the range.

Claims (10)

1. An automatic screw-fixed lumbar intervertebral fusion fixation device, characterized in that: comprising: One body, made of PEEK, the length is consistent with the length of the coronal slope of the human lumbar vertebral body, and the width is 70-80% of the sagittal plane width of the human lumbar vertebral body; the shape of the side wall fits the human body anatomy, including one side The front section of the wall, the middle section of the side wall and the rear section of the side wall, the distance between the upper edge and the lower edge of the front section of the side wall gradually decreases from the rear to the axis of the length direction of the front body, and the upper edge and lower edge of the middle section of the side wall They are all arc-shaped with a middle height and two bottoms. The angle between the upper and lower edges of the rear section of the side wall and the coronal horizontal plane of the human lumbar spine is 10-30 degrees; Arranged triangular positioning teeth, the tooth depth of the positioning teeth is 0.8 ~ 1.0mm, the front angle of the above-mentioned triangular positioning teeth is 30 degrees, the rear angle is 60 degrees, and the top angle is 90 degrees; the body has a front through up and down. Aggregate filling cavity and a rear aggregate filling cavity, the front aggregate filling cavity and the rear aggregate filling cavity are separated by a central wall, the two side walls of the front aggregate filling cavity have two front bone graft windows through, and the rear bone The two side walls of the material filling cavity have two through bone graft windows; a titanium alloy developing part is set on the body, and is 1.0-1.5 mm away from the front end of the body, which is used as a structural mark during the imaging process; A fixing piece, made of titanium alloy, has an upper self-tapping threaded through hole inclined upwards and inwards and a lower self-tapping threaded through hole inclined downwards and inwards, the upper self-tapping threaded through hole and the lower self-tapping threaded through hole The included angle with the horizontal plane is 30±10°, and the included angle with the sagittal plane is 10±2.5°; The fixing part is connected with the tail end of the body. 2. An automatic screw-fixed lumbar intervertebral fusion fixation device as claimed in claim 1, wherein the distance between the upper top surface and the rear two edges of the lower bottom surface of the body is from front to back. The axis in the length direction of the main body is gradually reduced. 3 . The automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 1 , wherein the length of the body is 30-45 mm, and the width is 10-15 mm. 4 . 4. An automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 3, characterized in that: the maximum width of the middle section of the side wall is 10 to 15 mm, and the minimum width is less than 10 mm and greater than or equal to 7 mm. 5. An automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 1, characterized in that: the length of the front bone graft window is 4-5 mm, and the width is 3-4 mm. 6. An automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 1, characterized in that: the length of the rear bone graft window is 4-5 mm, and the width is 3-4 mm. 7. An automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 1, characterized in that: the upper self-tapping thread through hole and the lower self-tapping thread through hole are both provided with an elastic limiter. 8. An automatic screw-fixed lumbar intervertebral fusion fixation device as claimed in claim 1, characterized in that: said fixation piece is provided with an upper limit stop adapted to a self-tapping thread through hole for inserting in the upper vertebral body. 9. An automatic screw-fixed lumbar intervertebral fusion fixation device as claimed in claim 1, characterized in that: said fixing piece is provided with a lower limit stopper adapted to the lower self-tapping thread through hole for inserting in the lower vertebral body. 10 . The automatic screw-fixed lumbar intervertebral fusion fixation device according to claim 1 , characterized in that: the middle part of the fixer is provided with a slot for clamping an instrument. 11 .