CN203089346U - Spine screw capable of swinging along signal direction - Google Patents
Spine screw capable of swinging along signal direction Download PDFInfo
- Publication number
- CN203089346U CN203089346U CN 201220731737 CN201220731737U CN203089346U CN 203089346 U CN203089346 U CN 203089346U CN 201220731737 CN201220731737 CN 201220731737 CN 201220731737 U CN201220731737 U CN 201220731737U CN 203089346 U CN203089346 U CN 203089346U
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- China
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- screw
- screw body
- installing hole
- sprig
- screw thread
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- Expired - Fee Related
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Abstract
The utility model discloses a spine screw capable of swinging along a single direction. The spine screw capable of swinging along the signal direction comprises a U-type screw base. The bottom of the U-type screw base is provided with a long circular installment hole. A U-type spacer sleeve is arranged in the middle of the U-type screw base above the long circular installment hole. A spherical surface installment cavity is formed between the bottom of the U-type spacer sleeve and the U-type screw base below the U-type spacer sleeve. The head portion of the screw body is a spherical head portion. Threads are arranged on the screw body below the spherical head portion. The screw body extends outwards from the long circular installment hole, and the spherical head portion of the screw body is completely accommodated in the spherical surface installment cavity above the long circular installment hole. A long circular shape is defined by two segments of circular arcs and two segments of straight lines, wherein the two circular arcs are connected with the two segments of straight lines, and the segments of two straight lines have the same length and are parallel. Both the two segments of straight lines on the long circular installment hole are arranged along the installment direction of a spine fixing bar. Straight line segment parts of the long circular installment hole are partially and tightly abutted against the outer side of the screw body below the spherical head portion so as to ensure that the screw body can only swing between the two segments of circular arcs on the long circular installment hole.
Description
Technical field
This utility model relates to medical instruments field, employed spinal screw when relating in particular to the treatment of a kind of orthopaedics internal fixation operation.
Background technology
Heredity, abnormal development, wound, chronic stress and tumor and other disease can cause the pathological condition of spinal column, and the pliability that this has reduced spinal column has limited the range of movement of spinal column.Adopting the surgery internal fixation operation that above-mentioned pathological condition is treated is Therapeutic Method medically commonly used at present.The spinal column multi-axial screws many at spinal columns such as thoracic vertebra, lumbar vertebra, waist sacrum, iliums preceding road and the internal fixation operation of the way of escape in use.The structure of the spinal column multi-axial screws that uses comprises at present: U sprig seat and screw body, the bottom of U sprig seat is provided with the circular mounting hole, be provided with U type interstage sleeve in the U sprig seat of top, circular mounting hole, the outer wall of U type interstage sleeve engages mutually with the inwall of U sprig seat and does not relatively rotate, form the sphere installation cavity between the U sprig seat of the bottom of U type interstage sleeve and its below, the head of screw body is a spherical head, screw body stretches out the circular mounting hole from U sprig seat, the all or part of of its spherical head is contained in the sphere installation cavity, and the following screw body in circular mounting hole can carry out 360 deg by its spherical head and rotate in the circular mounting hole.In the surgical operation, spinal column multi-axial screws and spinal fixation rod are used, and usually earlier squeeze into a plurality of spinal column multi-axial screws respectively in pathological changes spinal column both sides, run through in the U type groove of the U type interstage sleeve of the spinal column multi-axial screws of every side that then a spinal fixation rod being set.In intervertebral regression fusion and deformity of spine corrective procedure, need utilize orthotic procedures such as the spinal column multi-axial screws struts, pressurization, because can carrying out 360 deg in the circular mounting hole, screw body rotates, therefore some special occasions strut or during orthotic procedure such as pressurization the anti-rotational effect of vertebral body relatively poor, thereby strengthened operating difficulty, may cause final orthopedic effect undesirable.
The utility model content
This utility model technical issues that need to address are: provide a kind of and can greatly conveniently strut or orthotic procedure such as pressurization, improve the spinal column single pendulum screw of the anti-swirl effect of vertebral body.
For addressing the above problem, the technical solution adopted in the utility model is: spinal column single pendulum screw, comprise: U sprig seat and screw body, the bottom of U sprig seat is provided with installing hole, be provided with U type interstage sleeve in the U sprig seat of installing hole top, the outer wall of U type interstage sleeve engages mutually with the inwall of U sprig seat and does not relatively rotate, form the sphere installation cavity between the U sprig seat of the bottom of U type interstage sleeve and its below, the head of screw body is a spherical head, the screw body of spherical head below is provided with screw thread, protruding the installing hole of screw body from U sprig seat, its spherical head is contained in the sphere installation cavity, described installing hole is oblong shape, described oblong shape is to be surrounded by two sections circular arcs and two sections isometric parallel straight lines connecting two sections circular arcs to form, and two sections straight lines that form the Long Circle installing hole are along the installation direction setting of spinal fixation rod in U sprig seat; Described spherical head is contained in the sphere installation cavity that is positioned at Long Circle installing hole top fully, straightway on the Long Circle installing hole partly is close to the outside that retaining leans against the screw body of spherical head below, makes the following screw body of Long Circle installing hole to swing between two sections circular arcs that form the Long Circle installing hole along the part of the straightway on the slotted hole.
Further, aforesaid spinal column single pendulum screw, wherein, screw thread on the screw body is divided into interconnective upper and lower two sections, the epimere screw thread is the cortical bone screw thread that is positioned at the cortical bone section, the hypomere screw thread is the cancellous threads that is positioned at the spongy bone section, the cortical bone screw thread is identical with the external diameter of cancellous threads, but the internal diameter of cortical bone screw thread is greater than the internal diameter of cancellous threads, make the diameter of the screw body section be positioned at the cortical bone part greater than the diameter of the screw body section that is positioned at the spongy bone part, and cortical bone screw thread and cancellous threads are double thread.
Further, aforesaid spinal column single pendulum screw, wherein, the length of the length of described epimere screw thread and hypomere screw thread accounts for 2/5ths and 3/5ths of thread segment length overall on the screw body respectively.
Further, aforesaid spinal column single pendulum screw, wherein, the straightway on the Long Circle installing hole partly is close to the outside that keeps off the barrel portion on the screw body that leans against the spherical head below.
The beneficial effects of the utility model: the installing hole on the U sprig seat is arranged to oblong shape, and the straightway on the Long Circle installing hole partly is close to the outside that retaining leans against the screw body of spherical head below, make screw body between two sections circular arcs on the Long Circle installing hole, to swing, improved the anti-swirl effect of vertebral body like this, greatly facilitated and strut in the operation and orthotic procedure such as pressurization; Epimere screw thread on the screw body, also be the bottom diameter of cortical bone screw thread greater than the hypomere screw thread, also be the bottom diameter of cancellous threads, so both increased the intensity of the screw body of cortical bone part, can guarantee that again screw body and spongy bone partly have enough holds, thereby both effectively avoided the diastrophic phenomenon of spinal screw to take place, and can guarantee the bond strength of screw body and skeleton again; In addition, cortical bone screw thread and cancellous threads all are arranged to double thread, that has improved spinal column single pendulum screw so greatly advances nail speed, effectively reduces the probability that operative hemorrhage infects and other complication takes place.
Description of drawings
Fig. 1 is the structural representation of spinal column single pendulum screw described in the utility model.
Fig. 2 is the structural representation of U sprig seat among Fig. 1.
Fig. 3 is the structural representation that Fig. 2 looks up direction.
Fig. 4 is the cross-sectional view of thread segment screw body among Fig. 1.
Fig. 5 is a spinal column single pendulum screw swing state sketch map described in the utility model.
The specific embodiment
Below in conjunction with accompanying drawing and optimum embodiment this utility model is described in further detail.
As Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, spinal column single pendulum screw, comprise: U sprig seat 1 and screw body 2, the bottom of U sprig seat 1 is provided with Long Circle installing hole 3, oblong shape is to be surrounded by two sections circular arcs and two sections isometric parallel straight lines connecting two sections circular arcs to form, be provided with U type interstage sleeve 4 in the U sprig seat 1 of Long Circle installing hole 3 tops, the outer wall of U type interstage sleeve 4 engages mutually with the inwall of U sprig seat 1 and does not relatively rotate, form the sphere installation cavity between the U sprig seat 1 of the bottom of U type interstage sleeve 4 and its below, the head of screw body 2 is a spherical head 21, the screw body 2 of spherical head 21 belows is provided with screw thread, protruding the Long Circle installing hole 3 of screw body 2 from U sprig seat 1, two sections straight lines that form Long Circle installing hole 3 are along the installation direction setting of spinal fixation rod in U sprig seat 1; Described spherical head 21 is contained in the sphere installation cavity that is positioned at Long Circle installing hole 3 tops fully, straightway on the Long Circle installing hole 3 partly is close to the outside of the shell portion 24 that keeps off the screw body 2 that leans against spherical head 21 belows, make screw body 2 to swing between two sections circular arcs that constitute Long Circle installing hole 3 along the part of the straightway on the Long Circle installing hole 3, promptly screw body 2 can only be along the length direction swing of the spinal fixation rod in being installed on U sprig seat 1.Screw thread in the present embodiment on the screw body 2 is divided into interconnective upper and lower two sections, the epimere screw thread is the cortical bone screw thread 22 that is positioned at the cortical bone section, the hypomere screw thread is the cancellous threads 23 that is positioned at the spongy bone section, cortical bone screw thread 22 is identical with the external diameter of cancellous threads 23, but the internal diameter of cortical bone screw thread 22 is greater than the internal diameter of cancellous threads 23, make the diameter of the screw body section be positioned at the cortical bone part greater than the diameter of the screw body section that is positioned at the spongy bone part, and cortical bone screw thread 22 and cancellous threads 23 are double thread.The length of the length of described epimere screw thread and hypomere screw thread accounts for 2/5ths and 3/5ths of thread segment length overall on the screw body 2 respectively.
The beneficial effects of the utility model: the installing hole 3 on the U sprig seat 1 is arranged to oblong shape, and the straightway of Long Circle installing hole 3 partly is close to the outside that keeps off the shell portion 24 on the screw body 2 that leans against spherical head 21 belows, make screw body 2 between two sections circular arcs of Long Circle installing hole 3, to swing, improved the anti-swirl effect of vertebral body like this, greatly facilitated and strut in the operation and orthotic procedure such as pressurization; Epimere screw thread on the screw body 2, also be the bottom diameter of cortical bone screw thread 22 greater than the hypomere screw thread, also be the bottom diameter of cancellous threads 23, so both increased the intensity of the screw body 2 of cortical bone part, can guarantee that again screw body 2 and spongy bone partly have enough holds, thereby both effectively avoided the diastrophic phenomenon of spinal screw to take place, and can guarantee the bond strength of screw body 2 and skeleton again; In addition, cortical bone screw thread 22 and cancellous threads 23 all are arranged to double thread, that has improved spinal column single pendulum screw so greatly advances nail speed, effectively reduces the probability that operative hemorrhage infects and other complication takes place.
Claims (4)
1. spinal column single pendulum screw, comprise: U sprig seat and screw body, the bottom of U sprig seat is provided with installing hole, be provided with U type interstage sleeve in the U sprig seat of installing hole top, the outer wall of U type interstage sleeve engages mutually with the inwall of U sprig seat and does not relatively rotate, form the sphere installation cavity between the U sprig seat of the bottom of U type interstage sleeve and its below, the head of screw body is a spherical head, the screw body of spherical head below is provided with screw thread, protruding the installing hole of screw body from U sprig seat, its spherical head is contained in the sphere installation cavity, it is characterized in that: described installing hole is oblong shape, described oblong shape is to be surrounded by two sections circular arcs and two sections isometric parallel straight lines connecting two sections circular arcs to form, and two sections straight lines that form the Long Circle installing hole are along the installation direction setting of spinal fixation rod in U sprig seat; Described spherical head is contained in the sphere installation cavity that is positioned at Long Circle installing hole top fully, straightway on the Long Circle installing hole partly is close to the outside that retaining leans against the screw body of spherical head below, makes the following screw body of Long Circle installing hole to swing between two sections circular arcs that form the Long Circle installing hole along the part of the straightway on the slotted hole.
2. spinal column single pendulum screw according to claim 1, it is characterized in that: the screw thread on the screw body is divided into interconnective upper and lower two sections, the epimere screw thread is the cortical bone screw thread that is positioned at the cortical bone section, the hypomere screw thread is the cancellous threads that is positioned at the spongy bone section, the cortical bone screw thread is identical with the external diameter of cancellous threads, but the internal diameter of cortical bone screw thread is greater than the internal diameter of cancellous threads, make the diameter of the screw body section be positioned at the cortical bone part greater than the diameter of the screw body section that is positioned at the spongy bone part, and cortical bone screw thread and cancellous threads are double thread.
3. spinal column single pendulum screw according to claim 2 is characterized in that: the length of the length of described epimere screw thread and hypomere screw thread accounts for 2/5ths and 3/5ths of thread segment length overall on the screw body respectively.
4. spinal column single pendulum screw according to claim 2 is characterized in that: the straightway on the Long Circle installing hole partly is close to the outside that keeps off the barrel portion on the screw body that leans against the spherical head below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731737 CN203089346U (en) | 2012-12-27 | 2012-12-27 | Spine screw capable of swinging along signal direction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731737 CN203089346U (en) | 2012-12-27 | 2012-12-27 | Spine screw capable of swinging along signal direction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203089346U true CN203089346U (en) | 2013-07-31 |
Family
ID=48840799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220731737 Expired - Fee Related CN203089346U (en) | 2012-12-27 | 2012-12-27 | Spine screw capable of swinging along signal direction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203089346U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103040517A (en) * | 2012-12-27 | 2013-04-17 | 苏州欣荣博尔特医疗器械有限公司 | Simple-pendulum spinal screw |
| CN103908330A (en) * | 2014-03-31 | 2014-07-09 | 广州医科大学附属第一医院 | Self-guide long-arm solid percutaneous pedicle screw |
-
2012
- 2012-12-27 CN CN 201220731737 patent/CN203089346U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103040517A (en) * | 2012-12-27 | 2013-04-17 | 苏州欣荣博尔特医疗器械有限公司 | Simple-pendulum spinal screw |
| CN103908330A (en) * | 2014-03-31 | 2014-07-09 | 广州医科大学附属第一医院 | Self-guide long-arm solid percutaneous pedicle screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20211227 |