CN213465278U - Spinal full cortical bone thread reducing screw - Google Patents
Spinal full cortical bone thread reducing screw Download PDFInfo
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- CN213465278U CN213465278U CN202021985064.9U CN202021985064U CN213465278U CN 213465278 U CN213465278 U CN 213465278U CN 202021985064 U CN202021985064 U CN 202021985064U CN 213465278 U CN213465278 U CN 213465278U
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Abstract
The utility model relates to the technical field of medical equipment, a full cortex bone screw thread reducing screw of backbone, including U type nail seat and screw body, be connected with the screw body on the U type nail seat, its characterized in that screw body includes that the surface is equipped with the screw rod of cortex bone screw thread, and the screw rod includes by lower supreme sharp point portion, thin cylinder pole portion, frustum transition portion and thick cylinder pole portion that smooth transition connects in proper order. The utility model has the advantages of reasonable and compact structure, convenient to use, it is through setting up full length cortex bone screw thread on the screw body to increase the power of controlling of cortex bone around screw and the nail way, through the setting of screw rod shape, strengthened the mechanical strength of screw, anti fatigue fracture ability, make the screw have higher withdrawal force and torque.
Description
Technical Field
The utility model relates to the technical field of medical equipment, a full cortex bone screw thread reducing screw of spine.
Background
For nine or four nine years, michelle and Krueher reported anatomical features of the pedicles, suggesting that screws may pass posteriorly through the pedicles into the cancellous bone of the vertebral bodies. Due to the appearance design of the spine screw, the bone characteristics of the spine centrum are considered, so the thread design of the traditional pedicle screw is as follows: wide thread, pitch cancellous bone thread.
The traditional pedicle screw uses a pedicle long shaft as a screw channel, and when the bone density of an elderly osteoporosis patient is low, the trabecular structure of cancellous bone is not enough to maintain the holding force of the traditional lumbar pedicle screw, so that the screw is easy to loosen, and the screw is a common reason for failure after lumbar internal setting.
The cortical bone screw channel is a nail placement technique (CBT) proposed in 2009 by Ueno and Santoni BG. The screw design of the device adopts a screw thread design integrating cortical bone screw threads and cancellous bone screw threads, the screw sequentially holds vertebral plate cortex of a needle inlet point, inner side wall cortex of the vertebral pedicle and outer side wall cortex of the vertebral pedicle, and finally the head of the screw is stopped at an upper end plate of the vertebral body. The new technology increases the contact surface of the screw and the cortical bone, can increase 30 percent of axial tensile resistance compared with the traditional pedicle screw technology, increases the screw torsion by 1.7 times, is more suitable for osteoporosis patients compared with the traditional screw channel, and reduces the range of operation exposure and fusion fixation and the damage to the paravertebral muscle soft tissue.
However, the utility model people found in the early clinical, imaging and anatomical studies that the CBT technology still has some disadvantages: firstly, the tail of the traditional CBT screw is impacted due to the fact that the tail is close to the zygapophyseal joint, so that discomfort occurs to a patient, even the adjacent zygapophyseal joint is damaged in the screw placing process, the degeneration of the adjacent zygapophyseal joint and the adjacent corresponding intervertebral disc is accelerated, and the occurrence of 'adjacent vertebra disease' is caused; secondly, the traditional CBT screw technology does not well utilize the periphery of a screw placing point (fracture at the screw placing point is easy to occur), the inner side wall of the vertebral pedicle and the outer cortical bone of the vertebral body upper end plate, so that the stability of the screw is reduced; thirdly, anatomical references adopted by the nail feeding points do not reflect the minimally invasive principle of the spinal surgery, and particularly in the traditional bone grafting fusion revision between transverse processes, the lower edge of the transverse process is not easy to expose and anatomical morphological variation exists, so that an operator is difficult to confirm the lower edge of the transverse process; fourthly, the zygapophyseal joint anatomically referenced by the nail feeding point is easy to degenerate, and the patients receiving the operation treatment in clinic are often serious in zygapophyseal joint degeneration, so that deviation is easy to cause; fifthly, at the front end of the nail track of the traditional CBT screw technology, the nucleus pulposus part of the intervertebral disc can be damaged by breaking through the upper end plate of the vertebral body, so that the intervertebral disc is degenerated to cause the occurrence of the adjacent vertebral disease; sixthly, the traditional CBT anatomical reference cannot play a role in the spine revision surgery, a 3D printing guide plate designed according to the traditional anatomical sign cannot be accurately attached to a corresponding bone surface in the spine revision surgery, the guiding capability is lost, and the nail placement point and the nail placement angle can only be confirmed through higher-frequency X-ray perspective; seventhly, the existing cortical bone screw for clinical use comprises the design of a Soler screw produced by Medtronic company in America, and the design of a full cortical bone screw channel is not completely started from the idea of the full cortical bone screw channel, and half of the screw thread is designed into cancellous bone screw threads, but the design of the full cortical bone and full cortical bone screw channel in the full length of the screw channel is not really realized, so that the mechanical stability of the contact surface of the screw and the bone is influenced to a certain extent.
Aiming at the defects of the cortical bone screw technology, the utility model discloses the people further perfect, and an improved cortical bone screw technology is provided. The nail placing points, the nail placing anatomical reference, the nail path nail placing direction and the like of the technology are improved: the screw placing points are designed to enter along tangent lines of the inner side wall of the vertebral pedicle, so that threads can be better held by the inner side wall of the vertebral pedicle with thicker cortical bone, and a larger screw placing outward expansion angle is given, so that the screws can be held by the cortical bone end plate on the outer side of the vertebral body, the effective length of the screws and the contact area of the screws in screw channels and the cortical bone are further increased, and the biomechanical stability of the screws is improved. Because the full length of the screw channel in the improved cortical bone screw technology is basically cortical bone, and the front half part of the existing spinal screw is designed into cancellous bone threads, great inconvenience is brought in the screw placing process in the improved technology, the difficulty of placing the screw in the cortical bone screw channel is increased, the operation time is prolonged, more importantly, the cancellous bone threads are designed to be not beneficial to increasing the holding force of the screw in the cortical bone, the stability of the screw is reduced, and the operation failure risk is increased.
Disclosure of Invention
The utility model provides a full cortex bone screw thread reducing screw of backbone and backbone location orienting device has overcome above-mentioned prior art not enough, and it can effectively solve the problem that little, the screw fatigue resistance can be poor, life weak point of controlling between the screw that current backbone screw exists and cortex bone.
The technical scheme of the utility model is realized through following measure: the utility model provides a full cortex bone screw thread reducing screw of backbone, includes U type nail seat and screw body, is connected with the screw body on the U type nail seat, and the screw body is equipped with the threaded screw rod of cortex bone including the surface, and the screw rod includes by lower supreme tip portion, thin cylinder pole portion, frustum transition portion and thick cylinder pole portion that smooth transition connects in proper order, and the surface of tip portion, thin cylinder pole portion, frustum transition portion and thick cylinder pole portion all distributes and has the cortex bone screw thread.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the outer diameter of the cortical bone thread on the thin cylindrical rod part can be 4.5 mm, the sum of the lengths of the tip part and the thin cylindrical rod part is 16 mm to 25 mm, the outer diameter of the cortical bone thread on the thick cylindrical rod part is 5 mm to 5.5 mm, and the length of the thick cylindrical rod part is 10 mm to 12 mm.
The upper end of the thick cylindrical rod part can be fixedly connected with the U-shaped nail seat.
Above-mentioned thick cylinder pole portion upper end fixedly connected with bulb portion, U type nail seat bottom is equipped with the mounting hole, is formed with the sphere in the U type nail seat that corresponds the mounting hole top position and holds the chamber, and bulb portion rotates and holds in the sphere installation intracavity, and thick cylinder pole portion wears to locate in the mounting hole.
The tip portion may be a self-tapping tip.
The tip portion may be a self-drilling tip.
The utility model has reasonable and compact structure and convenient use, and can better match the improved leather bone screw channel technology provided by the utility model by arranging the full-length leather bone screw thread on the screw body, thereby not only reducing the screw placing difficulty during the operation, but also better increasing the holding force of the screw and the leather bone around the screw channel, preventing the screw from loosening and reducing the failure rate of the spinal surgery; through the arrangement of the shape of the screw rod, the mechanical strength and the fatigue fracture resistance of the screw are enhanced, so that the screw has higher extraction force and torque.
Drawings
Fig. 1 is a schematic structural view of a first embodiment of the present invention.
Fig. 2 is a schematic structural view of a third embodiment of the present invention.
The codes in the figures are respectively: 1 is a U-shaped nail seat, 2 is a cortical bone thread, 3 is a tip part, 4 is a thin cylindrical rod part, 5 is a frustum transition part, 6 is a thick cylindrical rod part, and 7 is a ball head part.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention will be further described with reference to the following examples and drawings:
the first embodiment is as follows: as shown in the attached drawing 1, the spine full-cortical bone thread reducing screw comprises a U-shaped screw seat 1 and a screw body, the screw body is connected to the U-shaped screw seat 1 and comprises a screw rod with cortical bone threads 2 on the surface, the screw rod comprises a tip part 3, a thin cylindrical rod part 4, a frustum transition part 5 and a thick cylindrical rod part 6 which are connected in sequence in a smooth transition mode from bottom to top, and the cortical bone threads 2 are distributed on the surfaces of the tip part 3, the thin cylindrical rod part 4, the frustum transition part 5 and the thick cylindrical rod part 6. The utility model adopts the design of the screw thread of the full-length cortical bone, and the full length of the screw channel in the improved cortical bone screw channel technology provided by the inventor is basically cortical bone, so compared with the prior spinal screw front end screw thread which is spongy bone screw thread, the utility model can be better matched with the improved cortical bone screw channel technology, thereby not only reducing the screw placing difficulty during the operation, but also better increasing the holding force of the screw and the cortical bone around the screw channel, preventing the screw from loosening and reducing the failure rate of the spinal operation; because pedicle of vertebral arch screw fracture in the clinical report, the screw neck that crooked most common region is, screw rod top and pin fin or nail seat junction promptly, and the utility model provides a screw rod is by sharp tip 3 of smooth transition connection in proper order, thin cylindrical rod portion 4, frustum transition portion 5 and thick cylindrical rod portion 6 are constituteed, has strengthened the mechanical strength at screw rod top through setting up of thick cylindrical rod portion 6 to strengthen the antifatigue fracture ability of screw, and not only guarantee through setting up of frustum transition portion 5 that the screw can twist into the backbone smoothly, can also make the screw have higher pull out power and torque.
The spinal full cortical bone thread reducing screw can be further optimized or/and improved according to actual needs:
as shown in fig. 1, the outer diameter of the cortical bone thread on the thin cylindrical shaft portion 4 is 4.5 mm, the sum of the lengths of the tip portion 3 and the thin cylindrical shaft portion 4 is 16 mm to 25 mm, the outer diameter of the cortical bone thread on the thick cylindrical shaft portion 6 is 5 mm to 5.5 mm, and the length of the thick cylindrical shaft portion 6 is 10 mm to 12 mm.
As shown in the attached figure 1, the upper end of the thick cylindrical rod part 6 is fixedly connected with the U-shaped nail seat 1, and the tip part 3 is a self-drilling tip. Therefore, the nail placing device is not needed to be used for additionally drilling and tapping, the operation time is further shortened, and the operation pain of a patient is reduced.
Example two: the present embodiment is different from the first embodiment only in that: the tip portion 3 is a self-tapping type tip. Therefore, the nail placing device is not needed to be used for carrying out additional tapping steps, the operation time is further shortened, and the operation pain of a patient is reduced.
Example three: as shown in fig. 2, the present embodiment is different from the first embodiment only in that: thick cylinder pole portion 6 upper end fixedly connected with bulb portion 7, 1 bottom of U type nail seat is equipped with the mounting hole, and it holds the chamber to correspond to be formed with the sphere in the U type nail seat 1 of mounting hole top position, and bulb portion 7 rotates and holds in the sphere installation intracavity, and thick cylinder pole portion 6 is worn to locate in the mounting hole, and pointed end portion 3 is most advanced for boring the type certainly. The U-shaped nail seat 1 can rotate relative to the screw body, so that the utility model can be conveniently connected with the connecting rod; in addition, the nail placing device is not needed to be used for additionally drilling and tapping, so that the operation time is further shortened, and the operation pain of a patient is reduced.
Example four: the present embodiment is different from the third embodiment only in that: the tip portion 3 is a self-tapping type tip.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (10)
1. The utility model provides a full cortex bone screw thread reducing screw of backbone, includes U type nail seat and screw body, is connected with the screw body on the U type nail seat, and its characterized in that screw body is equipped with the screw rod of cortex bone screw thread including the surface, and the screw rod includes by lower supreme tip portion, thin cylinder pole portion, frustum transition portion and thick cylinder pole portion that smooth transition connects in proper order, and the surface of tip portion, thin cylinder pole portion, frustum transition portion and thick cylinder pole portion all distributes and has the cortex bone screw thread.
2. The threaded reducer screw for spinal column full cortical bone according to claim 1, wherein the cortical bone thread on the thin cylindrical rod portion has an outer diameter of 4.5 mm, the sum of the lengths of the tip portion and the thin cylindrical rod portion is 16 mm to 25 mm, the cortical bone thread on the thick cylindrical rod portion has an outer diameter of 5 mm to 5.5 mm, and the length of the thick cylindrical rod portion is 10 mm to 12 mm.
3. The threaded reducer screw according to claim 1 or 2, wherein the upper end of the thick cylindrical rod is fixedly connected with the U-shaped nail seat.
4. The spinal full-cortical bone thread reducing screw according to claim 1 or 2, characterized in that the upper end of the thick cylindrical rod portion is fixedly connected with a ball head portion, the bottom of the U-shaped screw seat is provided with a mounting hole, a spherical receiving cavity is formed in the U-shaped screw seat corresponding to the position above the mounting hole, the ball head portion is rotatably received in the spherical receiving cavity, and the thick cylindrical rod portion is inserted in the mounting hole.
5. The threaded reducer screw according to claim 1 or 2, wherein the tip is a self-tapping tip.
6. The threaded reducer screw according to claim 3, wherein the tip is a self-tapping tip.
7. The threaded reducer screw according to claim 4, wherein the tip is a self-tapping tip.
8. The threaded reducer screw according to claim 1 or 2, wherein the tip is a self-drilling tip.
9. The threaded reducer screw according to claim 3, wherein the tip is a self-drilling tip.
10. The threaded reducer screw according to claim 4, wherein the tip is a self-drilling tip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021985064.9U CN213465278U (en) | 2020-09-11 | 2020-09-11 | Spinal full cortical bone thread reducing screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021985064.9U CN213465278U (en) | 2020-09-11 | 2020-09-11 | Spinal full cortical bone thread reducing screw |
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| CN213465278U true CN213465278U (en) | 2021-06-18 |
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| CN202021985064.9U Active CN213465278U (en) | 2020-09-11 | 2020-09-11 | Spinal full cortical bone thread reducing screw |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112022317A (en) * | 2020-09-11 | 2020-12-04 | 新疆医科大学第一附属医院 | Spine full-cortical bone thread reducing screw and spine positioning and orienting device |
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2020
- 2020-09-11 CN CN202021985064.9U patent/CN213465278U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112022317A (en) * | 2020-09-11 | 2020-12-04 | 新疆医科大学第一附属医院 | Spine full-cortical bone thread reducing screw and spine positioning and orienting device |
| CN112022317B (en) * | 2020-09-11 | 2024-06-14 | 新疆医科大学第一附属医院 | Full cortex bone screw thread reducing screw of backbone and backbone positioning orientation device |
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