Absorbable fixing device for internal fixation of spine

Abstract

The utility model discloses an absorbable fixing device for internal fixation of a spine. The absorbable fixing device is used for being fixed to the spine. The absorbable fixing device comprises an absorbable fixing rod and an absorbable pedicle screw or an absorbable bone hook. The absorbable pedicle screw or the absorbable bone hook is arranged on the outer wall of the absorbable fixing rod in a sleeving mode, so that the absorbable pedicle screw or the absorbable bone hook can move in the radial direction of the central axis of the absorbable fixing rod. According to the internal fixation device, temporary internal fixation can be carried out on an operation section after an operation, orthopedic operation is effectively maintained, and the problem that in the prior art, secondary operation needs to be carried out to take out internal fixation equipment, and trauma is caused is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical instruments, and in particular relates to an absorbable fixation device for spinal internal fixation. Background Art

[0002] When a patient has a spinal fracture or needs spinal decompression, spinal fixation is required to maintain the stability of the spine. Currently, when performing spinal fixation in clinical practice, materials with high support and good fixation (such as stainless steel, titanium alloy, etc.) are generally used to implant and fix the affected part of the spine. Generally, there are no discomfort symptoms after implantation, and it does not affect the magnetic resonance imaging. However, the use of the above materials to fix the spine is permanent. For parts that are greatly affected by the mobility of the spine (such as the lumbar spine, cervical spine, etc.), the use of the above permanent fixation method will seriously affect the patient's daily life.

[0003] For example: simple nucleus pulposus removal surgery is one of the surgical methods for treating simple lumbar disc herniation. At present, elastic internal fixation rods are used clinically as absorbable fixation devices for spinal internal fixation after simple nucleus pulposus removal, but the elastic range of elastic fixation is relatively limited, which still limits the mobility of the lumbar spine. Therefore, while avoiding the recurrence of lumbar disc herniation after simple nucleus pulposus removal, avoiding lumbar fusion internal fixation surgery and retaining lumbar mobility to the greatest extent are clinical problems that need to be solved urgently. Another example: scoliosis deformity is very common in children and adolescents. For scoliosis patients with obvious scoliosis and obvious trunk inclination, surgical treatment is required. The purpose of scoliosis surgery is to prevent the progression of deformity, restore spinal balance, correct deformity as much as possible, retain as many active segments of the spine as possible, and prevent nerve damage; for children and adolescents with scoliosis, early scoliosis surgery and correcting teratogenic factors as soon as possible can prevent the progression of spinal deformity, prevent the occurrence of cardiopulmonary function restriction, and ensure normal physical development. When permanent fixation methods in the prior art are used to implant and fix the affected part of the spine, a second operation is generally required to remove the implant, causing secondary trauma to the patient. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides an absorbable fixation device for spinal internal fixation, which can provide temporary internal fixation of the surgical segment after surgery, effectively maintain the correction, and also solve the problem of the prior art that a second operation is required to remove the internal fixation device, causing trauma.

[0005] The present application discloses an absorbable fixation device for spinal internal fixation, the absorbable fixation device is used to be fixed at the spinal part; the absorbable fixation device comprises: an absorbable fixation rod, and an absorbable pedicle screw or an absorbable bone hook;

[0006] The absorbable pedicle screw or the absorbable bone hook is sleeved on the outer wall of the absorbable fixation rod, so that the absorbable pedicle screw or the absorbable bone hook can move radially along the central axis of the absorbable fixation rod.

[0007] The absorbable pedicle screw comprises a screw head and a screw rod, wherein one end of the screw head away from the screw rod is provided with two symmetrical screw seats, and a bayonet adapted to the absorbable fixation rod is formed between the two screw seats; optionally, the screw head and the screw rod are integrally formed.

[0008] A screw plug adapted to the inner wall of the bayonet is arranged inside the bayonet; the absorbable fixing rod located inside the bayonet is fixed by the screw plug.

[0009] The absorbable pedicle screw is arranged by a universal pedicle screw or a double-head pedicle screw.

[0010] An internal thread is arranged on the inner wall of the nail seat, and the internal thread is matched with the thread on the outer side of the screw plug.

[0011] The outer wall of the nail rod is provided with a threaded section; the inner thread or the threaded section adopts a double thread structure.

[0012] The absorbable bone hook is connected to the absorbable fixation rod; the absorbable bone hook adopts a conventional lamina hook form or a double-locking universal lamina hook form.

[0013] The bone hook comprises an integrally formed hook seat and a hook body, a through slot for placing the absorbable fixation rod is provided at one end of the hook seat away from the hook body, and the hook body is connected to the spinal part.

[0014] Optionally, the bone hook further comprises a screw plug adapted to the groove wall of the through groove; the absorbable fixation rod located inside the through groove is fixed by the screw plug; optionally, the through groove is configured as a U-shaped groove, and the groove wall of the U-shaped groove is provided with an internal thread.

[0015] The absorbable fixation rod is configured as a cylindrical structure.

[0016] Any of the following applications:

[0017] Application of the above system in the diagnosis of the occurrence and development of diseases; Optionally, the diseases include lumbar disc herniation, etc.; Optionally, simple nucleus pulposus removal surgery is used in the lumbar disc herniation;

[0018] Beneficial effects of the utility model:

[0019] 1. The absorbable internal fixation unit innovatively disclosed in the present application can be used alone to provide temporary internal fixation of the surgical segment after simple nucleus pulposus removal, to stabilize the intervertebral disc and prevent the nucleus pulposus from falling out again; after the absorbable pedicle screw is absorbed in the body, the fixed segment of the lumbar spine regains its range of motion, and the effect of removing the internal fixation can be achieved without a second surgery, thus avoiding the physical and mental pain caused by secondary trauma to the patient; and while preventing the nucleus pulposus from falling out again after simple nucleus pulposus removal and the recurrence of lumbar disc herniation, it can also avoid lumbar fusion internal fixation surgery and retain the lumbar range of motion to the greatest extent.

[0020] 2. This application innovatively discloses an absorbable fixation device for spinal internal fixation, which introduces the concept of using absorbable units and / or non-absorbable units in combination or not, and is suitable for patients with spinal diseases; when the absorbable unit is applied to the spinal part, the double thread structure and other settings can effectively make up for the shortcomings of absorbable materials, such as magnesium-aluminum alloy, that are insufficient in strength. In addition, some of the solutions for the combined use of absorbable units and non-absorbable units disclosed in this application are currently technically achievable, and some of them are also expected to be technically achievable in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of an absorbable unit (absorbable fixation rod and absorbable pedicle screw) provided in at least one embodiment of the utility model;

[0023] Figure 2 is a schematic diagram of an absorbable unit (absorbable fixation rod and bone hook) provided in at least one embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of a combination of an absorbable unit and a non-absorbable unit (the absorbable unit and the non-absorbable unit are connected by a double-headed nail or a double U connector) provided by at least one embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of an absorbable pedicle screw or a non-absorbable pedicle screw in the utility model;

[0026] Figure 5 It is a schematic diagram of a double-headed nail in the utility model with a washer arranged inside the double-headed nail;

[0027] Figure 6It is a schematic diagram of a double-headed nail in the utility model without a washer arranged inside the double-headed nail;

[0028] Figure 7 It is a schematic diagram of the gasket in the utility model;

[0029] Figure 8 It is a schematic diagram of a double U connector in the utility model;

[0030] Fig. 9 It is a schematic diagram of a combination of an absorbable unit and a non-absorbable unit (the absorbable unit and the non-absorbable unit are connected by a connecting rod) provided in at least one embodiment of the utility model;

[0031] Fig.10 It is a schematic diagram of at least one embodiment of the present invention in which both ends of a non-absorbable unit are respectively connected to an absorbable unit (the absorbable unit and the non-absorbable unit are connected via a connecting rod);

[0032] Fig.11 It is a schematic diagram of the bone hook in the utility model;

[0033] Fig.12 It is a schematic diagram of at least one embodiment of the present invention in which both ends of a non-absorbable unit are respectively connected to an absorbable unit (one end of the non-absorbable unit is connected to the absorbable unit via a double U connector, and the other end of the non-absorbable unit is connected to the absorbable unit via a connecting rod);

[0034] In the figure, 11, absorbable pedicle screw; 12, absorbable fixation rod; 21, non-absorbable pedicle screw; 22, non-absorbable fixation rod; 31, nail head; 32, nail rod; 33, nail seat; 34, bayonet; 35, screw plug; 4, double-headed nail; 41, first base; 42, first fixing block; 43, second fixing block; 44, second base; 45, third fixing block; 46, through hole; 47, washer; 5, double U connector; 51, third base; 52, sixth fixing block; 53, fourth fixing block; 54, fifth fixing block; 6, connecting rod; 7, bone hook; 71, hook seat; 72, hook body. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the utility model are clearly and completely described below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Those skilled in the art can easily understand other advantages and functions of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] The embodiments and examples of the present disclosure are described in detail below with reference to the accompanying drawings.

[0037] For example, Figure 1 is a schematic diagram of an absorbable unit (absorbable fixation rod and absorbable pedicle screw) provided in at least one embodiment of the utility model, Figure 2 is a schematic diagram of an absorbable unit (absorbable fixation rod and bone hook) provided in at least one embodiment of the utility model, Figure 4 is a schematic diagram of an absorbable pedicle screw or a non-absorbable pedicle screw provided in this embodiment, Fig.11 is a schematic diagram of a bone hook provided in this embodiment. This specific embodiment provides an absorbable fixation device for spinal internal fixation, the absorbable fixation device is used to be fixed in the spinal part; the absorbable fixation device includes: an absorbable fixation rod, and an absorbable pedicle screw or an absorbable bone hook;

[0038] The absorbable pedicle screw 11 or the absorbable bone hook 7 is sleeved on the outer wall of the absorbable fixation rod 12 , so that the absorbable pedicle screw 11 or the absorbable bone hook 7 can move radially along the central axis of the absorbable fixation rod 12 .

[0039] In one embodiment, the absorbable pedicle screw 11 includes a nail head 31 and a nail rod 32, and two symmetrical nail seats 33 are provided at one end of the nail head 31 away from the nail rod 32, and a bayonet 34 adapted to the absorbable fixation rod 12 is formed between the two nail seats 33; optionally, the nail head 31 and the nail rod 32 are integrally formed.

[0040] In one embodiment, a screw plug 35 adapted to the inner wall of the bayonet 34 is disposed inside the bayonet 34 ; the absorbable fixation rod 12 located inside the bayonet 34 is fixed by the screw plug 35 .

[0041] In one embodiment, the absorbable pedicle screw 11 is configured as a universal pedicle screw or a double-headed pedicle screw.

[0042] In one embodiment, an internal thread is provided on the inner wall of the screw seat 33, and the internal thread is adapted to the thread on the outer side of the screw plug 35. In one embodiment, a thread segment is provided on the outer wall of the screw rod 32 to enhance the holding force of the absorbable pedicle screw 11 or the non-absorbable pedicle screw 21. The thread pitches of the thread segments are equal to enhance the holding force of the pedicle screw. The internal thread or thread segment adopts a double thread structure.

[0043] like Fig.11 As shown, in one embodiment, the absorbable bone hook 7 is connected to the absorbable fixation rod 12; the absorbable bone hook 7 adopts a conventional lamina hook form or a double-locking universal lamina hook form.

[0044] In one embodiment, the bone hook 7 includes an integrally formed hook seat 71 and a hook body 72, and a through groove for placing the absorbable fixation rod 12 is provided at one end of the hook seat 71 away from the hook body 72, and the hook body 72 is connected to the spinal column; optionally, the bone hook 7 also includes a screw plug 35 adapted to the groove wall of the through groove; the absorbable fixation rod 12 located inside the through groove is fixed by the screw plug 35; optionally, the through groove is provided as a U-shaped groove, and the groove wall of the U-shaped groove is provided with an internal thread.

[0045] In one embodiment, the absorbable fixation rod 12 is configured as a cylindrical structure. The length range of the absorbable fixation rod 12 is determined according to the target scoliosis area.

[0046] In one embodiment, the non-absorbable fixation rod 22 is configured as a cylindrical structure: the length range of the non-absorbable fixation rod 22 is determined according to the target scoliosis area;

[0047] In one embodiment, Figure 1 As shown, the absorbable fixation rod 12 and the absorbable pedicle screw 11 included in the absorbable unit are both made of absorbable materials; and the number of absorbable pedicle screws 11 set in a single absorbable fixation rod 12 is set to 2, but the number of absorbable pedicle screws 11 is not limited and can be freely set according to clinical needs.

[0048] In one embodiment, Figure 2 As shown, the absorbable fixation rod 12 and the bone hook 7 included in the absorbable unit are both made of absorbable materials. The number of bone hooks 7 provided on a single absorbable fixation rod 12 is set to two, and when two are provided, the hook bodies 72 are provided in opposite directions; however, the number of absorbable pedicle screws 11 provided is not limited and can be freely provided according to clinical needs.

[0049] Figure 3is a schematic diagram of a combination of an absorbable unit and a non-absorbable unit provided in this embodiment (the absorbable unit and the non-absorbable unit are connected via a double-headed nail 4 or a double U connector 5),

[0050] like Figure 3 As shown, the absorbable unit and the non-absorbable unit are connected by a double-headed nail 4 or a double U connector 5, and this solution is completely achievable in terms of technical level. In this embodiment, the absorbable units are all made of magnesium-aluminum alloy. The number of absorbable pedicle screws 11 provided in a single absorbable fixation rod 12 is 1, but the number of absorbable pedicle screws 11 provided is not limited and can be freely set according to clinical needs. The number of non-absorbable pedicle screws 21 provided in a single non-absorbable fixation rod 22 is 3, but the number of non-absorbable pedicle screws 21 provided is not limited and can be freely set according to clinical needs.

[0051] Figure 5 Schematic diagram of a stud nail 4 provided in this embodiment and a washer 47 disposed inside the stud nail 4. Figure 6 Schematic diagram of the stud nail 4 provided in this embodiment without a washer 47 provided therein. Figure 7 is a schematic diagram of the gasket 47 provided in this embodiment, Figure 8 is a schematic diagram of a double U connector 5 provided in this embodiment,

[0052] In one embodiment, the connecting piece is sleeved on the outer wall of the absorbable fixation rod 12 or the non-absorbable fixation rod 22, so that the absorbable fixation rod 12 or the non-absorbable fixation rod 22 is movable radially along the central axis of the absorbable fixation rod 12 or the non-absorbable fixation rod 22; the connecting piece includes but is not limited to the following structures: a double-headed nail 4, a double U connector 5, and a connecting rod 6.

[0053] like Figure 5 , Figure 6 As shown, the double-headed nail 4 includes: a first connection part for fixedly connecting the absorbable unit or the non-absorbable unit, and a second connection part for fixedly connecting the non-absorbable unit or the absorbable unit, and the first connection part and the second connection part are integrally formed;

[0054] Optionally, the first connecting portion includes a first base 41 and a first fixing block 42 and a second fixing block 43 arranged at the upper end of the first base 41; the first fixing block 42 and the second fixing block 43 are integrally formed and arranged at the upper end of the first base 41; an opening adapted to the absorbable fixing rod 12 or the non-absorbable fixing rod 22 is formed between the first fixing block 42 and the second fixing block 43; a screw plug 35 equipped with the inner wall of the opening is arranged inside the opening; the absorbable fixing rod 12 or the non-absorbable fixing rod 22 located inside the opening is fixed by the screw plug 35; the inner wall of the first fixing block 42 and the inner wall of the first side of the second fixing block 43 are symmetrical to each other, and a thread adapted to the screw plug 35 is arranged on the inner wall of the opening; the thread may also adopt a double thread structure. Figure 3 As shown, the first connecting portion is used to fix the absorbable fixation rod 12 .

[0055] Optionally, the second connecting portion includes a second base 44 and a second fixing block 43 and a third fixing block 45 arranged at the upper end of the second base 44; the second fixing block 43 and the third fixing block 45 are integrally formed and arranged at the upper end of the second base 44; an opening adapted to the non-absorbable fixing rod 22 or the absorbable fixing rod 12 is formed between the second fixing block 43 and the third fixing block 45; a screw plug 35 equipped with the inner wall of the opening is arranged inside the opening; the non-absorbable fixing rod 22 or the absorbable fixing rod 12 located inside the opening is fixed by the screw plug 35; the inner wall of the second side of the second fixing block 43 and the inner wall of the third fixing block 45 are symmetrical to each other, and a thread adapted to the screw plug 35 is arranged on the inner wall of the opening; the first base 41 and the second base 44 are integrally formed. Figure 3 As shown, the second connection portion is used to fix the non-absorbable fixation rod 22 .

[0056] Optionally, a through hole 46 is provided below the opening between the second fixing block 43 and the third fixing block 45 , and the through hole 46 is used to connect and fix the non-absorbable pedicle screw 21 ; a washer 47 matching the inner wall of the stud nail 4 is provided inside the stud nail 4 .

[0057] like Figure 7As shown, the double U connector 5 is used to fix the absorbable unit and / or the non-absorbable unit, and the double U connector 5 includes a third base 51 and a sixth fixing block, a fourth fixing block 53, and a fifth fixing block 54 arranged at the upper end of the third base 51; the sixth fixing block, the fourth fixing block 53, and the fifth fixing block 54 are integrally formed and arranged at the upper end of the third base 51; an opening adapted to the absorbable fixing rod 12 or the non-absorbable fixing rod 22 is formed between the sixth fixing block and the fourth fixing block 53; the fourth fixing block 5 3 and the fifth fixing block 54 form an opening adapted to the non-absorbable fixing rod 22 or the absorbable fixing rod 12; a screw plug 35 equipped with the inner wall of the opening is arranged inside the opening; the absorbable fixing rod 12 or the non-absorbable fixing rod 22 located inside the opening is fixed by the screw plug 35; a thread adapted to the screw plug 35 is arranged on the inner wall of the opening; the inner wall of the sixth fixing block and the inner wall of the first side of the fourth fixing block 53 are symmetrical to each other, and the second side of the inner wall of the fourth fixing block 53 and the inner wall of the fifth fixing block 54 are symmetrical to each other.

[0058] Fig. 9 is a schematic diagram of a combination of an absorbable unit and a non-absorbable unit provided in this embodiment (the absorbable unit and the non-absorbable unit are connected by a connecting rod 6),

[0059] In one embodiment, the connecting rod 6 is a part of the internal fixation rod, and the connecting rod 6 is also made of absorbable material, such as Fig. 9 As shown, a fixation rod can be divided into an absorbable part and a non-absorbable part. After the absorbable part of the fixation rod is absorbed in the body, only the permanent internal fixation part is retained, and the spinal mobility and growth and development ability of the temporary fixed segment are not restored. However, this solution cannot be achieved with current technology. The number of absorbable pedicle screws 11 set in a single absorbable fixation rod 12 is 1, but the number of absorbable pedicle screws 11 is not limited and can be freely set according to clinical needs. The number of non-absorbable pedicle screws 21 set in a single non-absorbable fixation rod 22 is 3, but the number of non-absorbable pedicle screws 21 is not limited and can be freely set according to clinical needs.

[0060] Fig.10 Schematic diagram of the non-absorbable unit provided in this embodiment having two ends connected to the absorbable unit (the absorbable unit and the non-absorbable unit are connected via a connecting rod 6),

[0061] In one embodiment, Fig.10As shown, absorbable fixation rods 12 are connected to both ends of the non-absorbable fixation rod 22, and the first end of the non-absorbable fixation rod 22 is provided with an absorbable fixation rod 12 with an absorbable pedicle screw 11 through a connecting rod 6 connecting sleeve, and the second end of the non-absorbable fixation rod 22 is provided with an absorbable fixation rod 12 with an absorbable bone hook 7 through a connecting rod 6 connecting sleeve, and the hook body 72 of the bone hook 7 is in the same direction. The number of absorbable pedicle screws 11 or bone hooks 7 provided in a single absorbable fixation rod 12 is 1, but the number of absorbable pedicle screws 11 provided is not limited and can be freely set according to clinical needs. The number of non-absorbable pedicle screws 21 provided in a single non-absorbable fixation rod 22 is 2, but the number of non-absorbable pedicle screws 21 provided is not limited and can be freely set according to clinical needs. The shape of the internal fixation rod mixed with absorbable and non-absorbable materials is a straight rod, the middle material is titanium alloy or cobalt-chromium-molybdenum alloy, and the two ends of the rod are made of magnesium alloy. Lengthening and fixation of the upper and lower vertebrae at the cervical stage.

[0062] Fig.12 Schematic diagram of the non-absorbable unit provided in this embodiment having two ends connected to the absorbable unit (one end of the non-absorbable unit is connected to the absorbable unit via a double U connector 5, and the other end of the non-absorbable unit is connected to the absorbable unit via a connecting rod 6).

[0063] In one embodiment, Fig.12 As shown, the absorbable fixation rod 12 is connected to both ends of the non-absorbable fixation rod 22, the first end of the non-absorbable fixation rod 22 is connected to the absorbable fixation rod 12 with the bone hook 7 through the double U connector 5, and the hook body 72 of the bone hook 7 connected to the first end of the non-absorbable fixation rod 22 is in the opposite direction; the second end of the non-absorbable fixation rod 22 is connected to the absorbable fixation rod 12 with the absorbable bone hook 7 through the connecting rod 6, and the hook body 72 of the bone hook 7 connected to the second end of the non-absorbable fixation rod 22 is in the opposite direction. The bone hooks 7 at both ends are stretched and pressurized at the same time.

[0064] Any of the following applications:

[0065] Application of the above system in the diagnosis of the occurrence and development of diseases; Optionally, the diseases include lumbar disc herniation, etc.; Optionally, simple nucleus pulposus removal surgery is used in the lumbar disc herniation;

[0066] The method of use is as follows: During the operation, according to the degree of scoliosis of the patient, appropriate absorbable units and / or non-absorbable units are selected for use alone or in combination, and are implanted in the appropriate spinal segment.

[0067] 1. When the absorbable unit is used in a simple nucleus pulposus removal surgery, an absorbable pedicle screw 11 and an absorbable fixation rod 12 are implanted after the simple nucleus pulposus removal surgery to temporarily fix the upper and lower vertebrae of the simple nucleus pulposus removal; the absorbable internal fixation uses a magnesium-aluminum alloy, which can be completely degraded in the body in about 6 months. By then, the annulus fibrosus of the surgical segment has formed a scar, the nucleus pulposus will not prolapse again, and the lumbar spine will regain normal mobility. The unit can use an absorbable magnesium-aluminum alloy, or other in vivo absorbable materials with a certain strength. The screw adopts a universal pedicle screw design, and its thread can adopt a double rib structure to compensate for the problem of insufficient strength of the magnesium-aluminum alloy and avoid internal fixation failure. The fixation rod is also made of absorbable material and is connected to the absorbable pedicle screw 11 through an absorbable tail nail.

[0068] 2. When absorbable units and non-absorbable units are used together, the expected internal fixation screw placement plan should be designed before scoliosis correction: in the apical vertebrae with severe scoliosis, or the vertebrae with heavy vertebral rotation, or the vertebrae in the osteotomy area, titanium alloy or cobalt-chromium-molybdenum alloy screws / laminar hooks should be used for strong permanent internal fixation; in the vertebrae at both ends of scoliosis, or the vertebrae that have a greater impact on the range of motion of the spine (such as the lumbar spine), magnesium alloy absorbable pedicle screws 11 / laminar hooks can be used for temporary fixation. The permanent internal fixation system and the temporary internal fixation system can be connected by absorbable connectors and absorbable internal fixation rods, or by internal fixation rods mixed with absorbable and non-absorbable materials.

[0069] For example, absorbable units and non-absorbable units are used in combination in adolescent idiopathic scoliosis (AIS) surgery. For AIS patients with lumbar scoliosis, if the distal fusion vertebra is fused to L4 or L5, the lumbar range of motion will be significantly reduced. However, for patients with severe inclination of L4 or L5, the scoliosis will not be fully corrected if it is not fused and fixed to L4 or L5. Therefore, an absorbable temporary fixation system is used to perform corrective fixation of L4 or L5 during surgery. After the absorbable internal fixation is absorbed by the body (which takes 6 months), the scoliosis correction is maintained for about 6 months, at which time the L4 or L5 vertebral range of motion is restored. Therefore, the absorbable internal fixation system can achieve corrective internal fixation and preserve lumbar range of motion in a non-invasive manner.

[0070] When absorbable and non-absorbable units are used together in the surgery of congenital scoliosis (CS) in children, for patients with congenital scoliosis with single hemivertebral deformity, posterior one-stage hemivertebral resection with short segments (one segment above and below the osteotomy) fixation and fusion is the gold standard for treatment. However, this surgery is only effective for cases with a small degree of scoliosis, where a long compensatory curve has not yet appeared and where simple short-segment fixation can close the osteotomy gap.

[0071] For CS patients with a large degree of scoliosis and a long arc, simple hemivertebra resection and short-segment fixation may not be able to completely correct the deformity. Sometimes, it is necessary to fix and fuse more than 3 segments while removing the hemivertebra to enhance the screw holding force and perform better correction. However, for children, fixation and fusion of longer spinal segments means that the growth potential of the fixed and fused segments is lost and normal growth cannot be achieved. Fixation and fusion of the posterior spine without fusion of the anterior vertebrae may cause the crankshaft phenomenon, which will cause the coronal plane of the spine to be unbalanced and the scoliosis to be aggravated. For such patients, we can use an absorbable internal fixation system at the distal end of the osteotomy gap for temporary internal fixation, and permanent internal fixation is used for the osteotomy segment. After the bone fusion of the osteotomy gap is definite and the correction effect is maintained for about 6 months, the temporary spinal internal fixation is absorbed by the body, releasing the tethering effect of the internal fixation on the spine. While correcting the deformity, the normal growth and development of the spine is retained to avoid coronal plane imbalance such as the crankshaft phenomenon.

[0072] The specific operation of the prior art simple nucleus pulposus removal surgery is to strip the paraspinal muscles and the interlaminar space of the spine through the posterior spine, perform lamina windowing, expose the spinal cord and nerve roots; pull the nerve roots, explore the protruding intervertebral disc, sharply cut the intervertebral disc annulus, and use tools such as nucleus pulposus forceps to clamp the protruding intervertebral disc nucleus pulposus; and then close the incision layer by layer. The advantage of simple nucleus pulposus removal is that the surgical incision is small, no internal fixation is required, fusion surgery is avoided, and the lumbar mobility is retained to the greatest extent. However, due to the destruction of the annulus fibrosus structure, the relative movement between the vertebral bodies will make the nucleus pulposus in the annulus fibrosus easier to fall out and protrude into the spinal canal after surgery, thereby causing recurrence. Usually, for patients after simple nucleus pulposus removal, doctors recommend supine immobilization for more than 2 weeks to avoid vigorous spinal activity causing the nucleus pulposus to fall out again; after the annulus fibrosus rupture is scarred, the waist is subjected to vigorous activities.

[0073] There are a few points to note:

[0074] (1) The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures may refer to the general design.

[0075] (2) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0076] The above description is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be based on the protection scope of the claims.

[0077] The above-mentioned embodiments are only used to understand the present invention. It should be noted that, for those skilled in the art, several improvements can be made to the present invention without departing from the principle of the present invention, and these improvements will also fall within the scope of protection of the claims of the present invention.

Claims

1. An absorbable fixation device for spinal internal fixation, the absorbable fixation device is used to be fixed on the spinal part; characterized in that: The absorbable fixation device comprises: an absorbable fixation rod, and an absorbable pedicle screw or an absorbable bone hook; The absorbable pedicle screw or the absorbable bone hook is sleeved on the outer wall of the absorbable fixation rod, so that the absorbable pedicle screw or the absorbable bone hook can move radially along the central axis of the absorbable fixation rod.

2. The absorbable fixation device for spinal internal fixation according to claim 1, characterized in that: The absorbable pedicle screw comprises a screw head and a screw rod. The end of the screw head away from the screw rod is provided with two mutually symmetrical screw seats, and a bayonet adapted to the absorbable fixation rod is formed between the two screw seats.

3. The absorbable fixation device for spinal internal fixation according to claim 2, characterized in that: The nail head and the nail rod are integrally formed.

4. The absorbable fixation device for spinal internal fixation according to claim 2, characterized in that: A screw plug adapted to the inner wall of the bayonet is arranged inside the bayonet; the absorbable fixing rod located inside the bayonet is fixed by the screw plug.

5. The absorbable fixation device for spinal internal fixation according to claim 1, characterized in that: The absorbable pedicle screw is arranged by a universal pedicle screw or a double-head pedicle screw.

6. The absorbable fixation device for spinal internal fixation according to claim 4, characterized in that: An internal thread is arranged on the inner wall of the nail seat, and the internal thread is matched with the thread on the outer side of the screw plug.

7. The absorbable fixation device for spinal internal fixation according to claim 6, characterized in that: The outer wall of the nail rod is provided with a threaded section; the inner thread or the threaded section adopts a double thread structure.

8. The absorbable fixation device for spinal internal fixation according to claim 1, characterized in that: The absorbable bone hook is connected to the absorbable fixation rod; the absorbable bone hook adopts a conventional lamina hook form or a double-locking universal lamina hook form.

9. The absorbable fixation device for spinal internal fixation according to claim 1, characterized in that: The bone hook comprises an integrally formed hook seat and a hook body. A through groove for placing the absorbable fixation rod is arranged at one end of the hook seat away from the hook body, and the hook body is connected to the spinal column.

10. The absorbable fixation device for spinal internal fixation according to claim 9, characterized in that: The bone hook also includes a screw plug matched with the groove wall of the through groove; the absorbable fixing rod located inside the through groove is fixed by the screw plug.

11. The absorbable fixation device for spinal internal fixation according to claim 10, characterized in that: The through groove is arranged as a U-shaped groove, and the groove wall of the U-shaped groove is arranged with an internal thread.

12. The absorbable fixation device for spinal internal fixation according to claim 1, characterized in that: The absorbable fixation rod is configured as a cylindrical structure.

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