CN102068302B - Bone screw anti-back device for internal spinal fixation system - Google Patents
Bone screw anti-back device for internal spinal fixation system Download PDFInfo
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- CN102068302B CN102068302B CN201010597792A CN201010597792A CN102068302B CN 102068302 B CN102068302 B CN 102068302B CN 201010597792 A CN201010597792 A CN 201010597792A CN 201010597792 A CN201010597792 A CN 201010597792A CN 102068302 B CN102068302 B CN 102068302B
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- Prior art keywords
- bone screw
- spinal
- steel plate
- annular groove
- holddown spring
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
- A61B17/8042—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers the additional component being a cover over the screw head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
- A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a bone screw anti-back device for an internal spinal fixation system and relates to a bone screw anti-back device for internally fixing spinal fractures. The device comprises a bone screw, a spinal steel plate and a pressure spring, wherein the spinal steel plate is a rectangle, stepped holes are formed at four corners, the larger ends of the stepped holes are provided with circular holes and the smaller ends of the stepped holes are provided with conical holes; an annular groove is formed in the circular holes at the larger ends; the pressure spring is arranged in the annular groove; a backstop step is formed on the lower part of an end face on one side of the bone screw; a conical surface is arranged on the lower part of the backstop step; the conical surface of the bone screw is extruded to be arranged on the pressure spring in the annular groove of the spinal steel plate; the pressure spring opens in the annular groove; the bone screw is continuously screwed until the conical surface of the bone screw and the conical holes of the stepped holes are laminated and compressed; and the pressure spring is contracted and clamped on the backstop step of the bone screw. The pressure spring has an annular shape, is closed, and is used for clamping the bone screw. The bone screw is provided with a bone thread; a thread section of the bone screw is provided with a sharp cutting groove; and a plum blossom hole is formed on an end face on one side of the bone screw.
Description
Technical field
What spinal internal fixation system of the present invention related to the anti-unloading device of bone screw is a kind of anti-unloading device that is used for the bone screw that the spinal fracture internal fixation uses.
Background technology
At present, along with the development of internal fixation of spine technology, use the regression of steel plate screw treatment pathologic at cervical vertebra, thoracic vertebra and lumbar vertebra, spinal trauma is very general.Multiple structural design has appearred in the development through decades.Research shows that the use of internal fixation of spine technology can increase the bone fusion rate, increases anti-spin intensity, axial load and the anti-Qu Li that stretches.Because human spine's special physiological structure and activity frequency; Design and manufacturing for spinal internal fixation system require height, not only will have good intensity biology, also require to have narrower width simultaneously; Lower makes sure to keep in mind, and also will have firm bone screw to prevent unloading device simultaneously.Clinical proof withdraws from device if no additional reliable bone screw is anti-, causes becoming flexible of bone screw easily and withdraws from steel plate, causes the failure of operation.The spinal internal fixation system that existing market is used, most of design all has various bone screw withdrawing mode, but complex structure is made difficulty, still have certain limitation, even also there is certain probability that comes off in anti-unloading device itself.
Summary of the invention
The present invention seeks to above-mentioned weak point, provide spinal internal fixation system, be a kind of anti-unloading device that adopts holddown spring and stopping step with the anti-unloading device of bone screw, simple in structure; Easy to manufacture, easy to operate and safe, shortened operating time; Few patient's misery can reduce the risk in the art, and fracture end is fixing reliable; But early functional exercise promotes union of fracture, effectively reduces complication.
Spinal internal fixation system takes following technical scheme to realize with the anti-unloading device of bone screw: spinal internal fixation system comprises bone screw, spinal column steel plate and holddown spring with the anti-unloading device of bone screw.The spinal column steel plate is a rectangle, all is provided with stepped hole on four angles of spinal column steel plate, and the big end of stepped hole is a circular hole, and small end is a taper hole, holds greatly and is provided with annular groove in the circular hole.Holddown spring is housed in the annular groove, and said holddown spring circularizes, and seals.Bone screw is provided with bone thread, and thread segment has sharp cutting groove, and the bone screw upper surface is provided with plum blossom hole, cooperates with operation tool, and the end face bottom is provided with the stopping step, and stopping step bottom is provided with the conical surface.The conical surface extruding of bone screw is installed on the holddown spring in the spinal column steel plate annular groove; Holddown spring opens in annular groove; Bone screw continues screw-in and compresses up to the conical surface of bone screw and the taper hole applying of stepped hole, and holddown spring is stuck on the stopping step of bone screw after shrinking.
Operation principle:
The spinal column steel plate is temporarily fixed on the spinal column through operating theater instruments, cooperates with taper hole in the stepped hole of drill bushing insertion spinal column steel plate, drill bushing props up surface of bone, on surface of bone, gets out the duct, and bone screw is screwed in the vertebral body along the duct.In the screw-in process; The conical surface extruding of bone screw is installed on the holddown spring in the spinal column steel plate annular groove; Holddown spring opens in annular groove; Bone screw continues screw-in and compresses up to the conical surface of bone screw and the taper hole applying of stepped hole, and holddown spring is stuck on the stopping step of bone screw after shrinking, and has realized the anti-back function to bone screw.
Internal fixation of spine is with bone screw anti-back apparatus features
Spinal internal fixation system is reasonable in design, simple in structure, easily manufactured, easy to operate and safe with the anti-unloading device of bone screw; Need not unnecessary anti-back procedure, screw in screw and anti-backward and accomplish, shortened operating time; Few patient's misery promotes union of fracture, can reduce the risk in the art; Anti-unloading device is reliable and stable, significantly reduces severe complications such as internal fixation failure that screw loosening produces and visceral injury, but early functional exercise.
Description of drawings
Below will combine accompanying drawing that the present invention is described further:
Fig. 1 is the bone screw sketch map of spinal internal fixation system with the anti-unloading device of bone screw.
Fig. 2 is the bone screw vertical view of spinal internal fixation system with the anti-unloading device of bone screw.
Fig. 3 is the spinal column steel plate sketch map of spinal internal fixation system with the anti-unloading device of bone screw.
Fig. 4 spinal internal fixation system is with the sketch map of the holddown spring of the anti-unloading device of bone screw.
Fig. 5 is the stepped hole structural representation of spinal internal fixation system with the spinal column steel plate of the anti-unloading device of bone screw.
Fig. 6 is equipped with the holddown spring sketch map in the stepped hole of spinal internal fixation system with the spinal column steel plate of the anti-unloading device of bone screw.
Fig. 7 is that internal fixation of spine is with bone screw anti-back apparatus structure sketch map.
The specific embodiment
With reference to accompanying drawing 1～7, spinal internal fixation system comprises spinal column steel plate 8, bone screw 1 and holddown spring 12 with the anti-unloading device of bone screw.Spinal column steel plate 8 is a rectangle, all is provided with stepped hole 7 on four angles of spinal column steel plate 8, and stepped hole 7 big ends are circular holes 9, and stepped hole 7 small ends are taper holes 11, hold greatly to be provided with annular groove 10 in the circular hole 9, and holddown spring 12 is housed in the annular groove 10.Holddown spring 12 circularizes and seals, and is used to tighten bone screw 1.Bone screw 1 is provided with bone thread 4, and the thread segment of bone screw 1 has sharp cutting groove 5, and bone screw 1 upper surface is provided with plum blossom hole 6, and the bottom of end face is provided with stopping step 2, and stopping step 2 bottoms are provided with the conical surface 3.Spinal column steel plate 8 is temporarily fixed on the spinal column through operating theater instruments, cooperates with taper hole 11 in the stepped hole 7 of drill bushing insertion spinal column steel plate 8, drill bushing props up surface of bone, on surface of bone, gets out the duct, and bone screw 1 is screwed in the vertebral body along the duct.In the screw-in process; The conical surface 3 extruding of bone screw 1 are installed on the holddown spring 12 in spinal column steel plate 8 annular grooves 10; Holddown spring 12 10 opens in annular groove; Bone screw 1 continues screw-in and compresses up to the conical surface 3 of bone screw 1 and taper hole 11 applyings of stepped hole 7, is stuck on the stopping step of bone screw 1 after holddown spring 12 shrinks, and has realized the anti-back function to bone screw 1.
Claims (4)
1. a spinal internal fixation system is characterized in that comprising bone screw, spinal column steel plate and holddown spring with the anti-unloading device of bone screw; All be provided with stepped hole on four angles of spinal column steel plate, the big end of stepped hole is a circular hole, and small end is a taper hole; Be provided with annular groove in the big end circular hole; Holddown spring is housed in the annular groove, and bottom, bone screw one side end face is provided with the stopping step, and stopping step bottom is provided with the conical surface; The conical surface extruding of bone screw is installed on the holddown spring in the spinal column steel plate annular groove; Holddown spring opens in annular groove, and bone screw continues screw-in and compresses up to the conical surface of bone screw and the taper hole applying of stepped hole, and holddown spring is stuck on the stopping step of bone screw after shrinking;
Said holddown spring circularizes, and seals, and holddown spring is to turn to the annular turn by spring wire, is used to tighten bone screw.
2. spinal internal fixation system according to claim 1 is with the anti-unloading device of bone screw, and its characteristic is provided with bone thread in said bone screw, and the thread segment of bone screw has sharp cutting groove.
3. spinal internal fixation system according to claim 1 is with the anti-unloading device of bone screw, and its characteristic is provided with plum blossom hole in said bone screw upper surface.
4. spinal internal fixation system according to claim 1 is with the anti-unloading device of bone screw, and its characteristic is a rectangle at said spinal column steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010597792A CN102068302B (en) | 2010-12-20 | 2010-12-20 | Bone screw anti-back device for internal spinal fixation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010597792A CN102068302B (en) | 2010-12-20 | 2010-12-20 | Bone screw anti-back device for internal spinal fixation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102068302A CN102068302A (en) | 2011-05-25 |
| CN102068302B true CN102068302B (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010597792A Active CN102068302B (en) | 2010-12-20 | 2010-12-20 | Bone screw anti-back device for internal spinal fixation system |
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| CN (1) | CN102068302B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141927A (en) * | 2005-01-12 | 2008-03-12 | 华沙整形外科股份有限公司 | Anchor retaining mechanisms for bone plates |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2905846B1 (en) * | 2006-09-14 | 2008-10-24 | Newclip Technics | IMPLANTABLE ORTHOPEDIC DEVICE, ESPECIALLY FOR CERVICAL RACHIS |
| US8211154B2 (en) * | 2009-04-06 | 2012-07-03 | Lanx, Inc. | Bone plate assemblies with backout protection and visual indicator |
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2010
- 2010-12-20 CN CN201010597792A patent/CN102068302B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101141927A (en) * | 2005-01-12 | 2008-03-12 | 华沙整形外科股份有限公司 | Anchor retaining mechanisms for bone plates |
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| Publication number | Publication date |
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| CN102068302A (en) | 2011-05-25 |
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