CN106551733A - A kind of fixed lumbar intervertebral fusion fixing device of titanium nail - Google Patents

Abstract

The invention discloses a lumbar intervertebral fusion fixation device fixed by titanium nails, comprising: a body made of PEEK and a fixing piece made of titanium alloy, the fixing piece is connected with the tail end of the body, and a developing piece made of titanium alloy It is set on the body and is 1.0-1.5 mm away from the front end of the body, and is used as a structural mark during the imaging process. The titanium nail-fixed lumbar intervertebral fusion fixation device of the present invention can be used for minimally invasive passage insertion, including lateral approach lumbar fusion and fixation (DLIF) and oblique anterior approach lumbar fusion and fixation (OLIF). The lumbar intervertebral fusion fixation device can be connected to the main body and the fixation piece to prevent unnecessary displacement, and the fixation is firm. Putting together can also simplify the operation steps, shorten the operation time, reduce the difficulty of the operation, and reduce the patient's intraoperative pain. damage.

Description

Lumbar intervertebral fusion fixation device fixed by titanium nail

technical field

The invention belongs to the technical field of medical devices, and in particular relates to a lumbar intervertebral fusion fixation device fixed with titanium nails.

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 a titanium nail-fixed lumbar intervertebral fusion fixation device.

Technical scheme of the present invention is as follows:

A lumbar intervertebral fusion fixation device fixed with titanium nails, 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 part, made of titanium alloy, has an upper titanium nail through hole inclined upward and inward and a lower titanium nail through hole inclined downward and inward with the inner surface being a smooth curved surface, the upper titanium nail through hole and the lower titanium nail through hole The angle between the hole and the horizontal plane is 30±10°, and they are all parallel to the sagittal plane;

Two titanium nails, each titanium nail has a nail cap and an arc-shaped and smooth nail body, and the nail cap has an arc surface;

The fixing part is connected with the tail end of the main body, and the two titanium nails are adapted to the through holes of the upper titanium nail and the lower titanium nail respectively.

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, an elastic stopper is provided on the upper titanium nail through hole and the lower titanium nail through hole.

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

In a preferred embodiment of the present invention, the fixing member is provided with a lower limit block adapted to the through hole of the lower titanium nail, so as to be embedded in 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 titanium nail-fixed lumbar intervertebral fusion fixation device of the present invention can be used for minimally invasive channel insertion, and the titanium nail-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 through holes of the upper and lower titanium nails of the present invention have elastic limiters, which can be pressed back when the titanium nail is inserted, and pop out again after the titanium nail is fully inserted, and can be stuck on the outer edge of the head end of the titanium nail. Prevent titanium nails from withdrawing and reduce 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 titanium nails, which avoids the fixing of the nail plate and nail rod system outside the vertebral body, and can achieve zero notch without affecting the adjacent The movement of the joint 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.

Fig. 4 is a schematic structural view of the titanium nail 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, a titanium nail fixed lumbar intervertebral fusion fixation device includes a PEEK (polyether ether ketone) body 1, a titanium alloy fixture 2 and a titanium nail 3, the fixture 2 is connected with the tail end of the body 1, 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 part 2 has an upper titanium nail through hole 21 inclined upwards and inwards and a lower titanium nail through hole 22 inclined downwards and inwards with the inner surface being a smooth curved surface. The included angle between the titanium nail through hole 22 and the horizontal plane is 30±10°, and both are parallel to the sagittal plane. Match the lower stopper 24 of the through hole 22 of the titanium nail. During the implantation process of the present invention, the upper limiter 23 and the lower limiter 24 can be embedded in the upper and lower vertebral bodies, preventing the present invention from being too deep on the one hand. Into the vertebral body, on the one hand, can increase the anti-rotation stability of the present invention; the upper titanium nail through hole 21 and the lower titanium nail through hole 22 are provided with an elastic limiter 25, when the titanium nail is inserted, the elastic The limiter 25 is extruded to give way, and resets after the titanium nail is completely screwed in, and can be stuck on the outer edge of the head end of the titanium nail to prevent the titanium nail from withdrawing. Preferably, the angle of the titanium nail relative to the titanium alloy fixing plate can be adjusted. In addition, the middle part of the fixing member 2 is also preferably provided with a slot 26 suitable for clamping instruments, which can be combined with corresponding auxiliary tools to facilitate the insertion of the present invention through a minimally invasive channel. As shown in Figure 4, the above-mentioned titanium nail 4 is composed of a nail cap 41 and a nail body 42. The nail cap 41 has an arc surface, and the nail body 42 is adapted to the smooth curved surface of the upper titanium nail through hole 21 and the lower titanium nail through hole 22. , the running from the nail cap 41 to the nail tip is arc-shaped, and the nail body 42 is smooth, and can be directly knocked into the vertebral body along the vertical direction, which is convenient for insertion in the narrow space of the minimally invasive channel. The preferred diameter is 4mm, and the length 30-40mm, the nail cap is arc-shaped.

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. a titanium nail 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 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 part, made of titanium alloy, has an upper titanium nail through hole inclined upward and inward and a lower titanium nail through hole inclined downward and inward with the inner surface being a smooth curved surface, the upper titanium nail through hole and the lower titanium nail through hole The angle between the hole and the horizontal plane is 30±10°, and they are all parallel to the sagittal plane; Two titanium nails, each titanium nail has a nail cap and an arc-shaped and smooth nail body, and the nail cap has an arc surface; The fixing part is connected with the tail end of the main body, and the two titanium nails are adapted to the through holes of the upper titanium nail and the lower titanium nail respectively. 2. A titanium nail-fixed lumbar intervertebral fusion fixation device as claimed in claim 1, characterized in that: the distance between the upper top surface of the body and the rear two edges of the lower bottom surface is from front to back. The axis in the length direction of the main body is gradually reduced. 3 . The lumbar intervertebral fusion fixation device fixed with titanium nails according to claim 1 , wherein the length of the body is 30-45 mm, and the width is 10-15 mm. 4 . 4 . The titanium nail-fixed lumbar intervertebral fusion fixation device according to claim 3 , wherein 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. The lumbar intervertebral fusion fixation device fixed with titanium nails 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 . The titanium nail-fixed lumbar intervertebral fusion fixation device according to claim 1 , wherein the length of the rear bone graft window is 4-5 mm, and the width is 3-4 mm. 7 . 7 . The lumbar intervertebral fusion fixation device fixed by titanium nails according to claim 1 , characterized in that: the upper titanium nail through hole and the lower titanium nail through hole are both provided with an elastic limiter. 7 . 8. A titanium nail-fixed lumbar intervertebral fusion fixation device as claimed in claim 1, characterized in that: said fixing piece is provided with an upper limit stopper adapted to the through hole of the upper titanium nail, for inserting the upper In the vertebral body. 9. A titanium nail-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 through hole of the lower titanium nail, for embedding the lower In the vertebral body. 10. The titanium nail-fixed lumbar intervertebral fusion fixation device according to claim 1, characterized in that: the middle part of the fixation piece is provided with a slot for clamping instruments.