CN2647255Y - Medical expansion type pediculus arcus vertebrac screw - Google Patents
Medical expansion type pediculus arcus vertebrac screw Download PDFInfo
- Publication number
- CN2647255Y CN2647255Y CN 03262479 CN03262479U CN2647255Y CN 2647255 Y CN2647255 Y CN 2647255Y CN 03262479 CN03262479 CN 03262479 CN 03262479 U CN03262479 U CN 03262479U CN 2647255 Y CN2647255 Y CN 2647255Y
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- CN
- China
- Prior art keywords
- screw
- inner bolt
- hollow screw
- blind hole
- hole channel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a medical expansion vertebral pedicle screw, which is characterized in that the screw comprises an outer hollow screw with a tip, a blank hole channel is provided in the center of the outer hollow screw, the blank hole channel is provided with a conical tip. The blank hole channel is provided with an inner thread matching the inner bolt. The tip of the outer hollow screw is evenly incised into the expansion part with four flaps along the axial direction; the sac crack on the expansion part is behind the conical tip in the blank hole channel; The top part of one inner bolt which matches the blank hole channel of the outer hollow screw is also conical. The rear is provided with a thread and a tetragonal body for holding. The utility model changes the contacting way between the vertebral pedicle screw and the centrums through mechanical expansion. The contacting mechanics way between the screw and the screw path is changed when the inner bolt is screwed in, which effectively improves the anti-drawing intensity during the application, if the implantation of the screw is found improper during the operation, the screw is pulled out timely which reduces the incidence of failed operation.
Description
One, affiliated technical field
This utility model belongs to medical apparatus, relates to a kind of new medical expansion type pedicle screw, can effectively improve stability, the reliability of pedicle internal fixation of spine apparatus.
Two, background technology
Adopted long spiro nail since vertebral plate, pedicle of vertebral arch reach vertebral body fixedly lumbosacral joint is achieved success from nineteen fifty-nine Boucher, pedicle internal fixation of spine art worldwide has been widely used in various spine disorderses such as treatment treatment degeneration spinal lesion, wound, tumor of spine, deformity of spine, has obtained comparatively ideal curative effect.At present, the pedicle internal fixation has been the spinal surgery operation method through way of escape spinal fixation commonly used.At present international pedicle screw is an internal diameter taper shape and external diameter is columniform full thread solid construction, diameter 4.5mm～8.5mm.The intensity that goes out the resistance to plucking of this screw depends on the contact area of screw thread and sclerotin and the intensity of vertebral body itself, it is less that common resistance to plucking goes out intensity, be not enough to resist the pulling force that vertebral body resets, required powerful pulling force and fixing back continue fixedly the time, thereby usually cause vertebral body to reset, fix failure or can not reach good anatomical reduction, lose the operation meaning.Especially osteoporosis is arranged as the patient, the postoperative activity is improper, or the pedicle screw resistance to plucking exerts oneself when not enough, screw loosening often occurs even deviates from, and causes operative failure.
Three, summary of the invention
Defective and deficiency at above-mentioned prior art existence, in order to reduce the incidence rate that pedicle screw is loosening even deviate from, this utility model provides a kind of expansion type pedicle screw, this screw changes the way of contact of pedicle screw and vertebral body by mechanical swelling, the resistance to plucking that can effectively improve pedicle screw goes out intensity, increase the stability and the reliability of internal fixation of spine, reduce the operative failure incidence rate.
The technical solution that realizes above-mentioned purpose is: a kind of medical expansion type pedicle screw, form by external hollow screw and inner bolt two parts, and be characterized in:
The external hollow screw has point, after the most advanced and sophisticated position external screw thread is arranged, there is a blind hole road in the central authorities of external hollow screw, there is the tip of taper in the blind hole road, the blind hole road is provided with the female thread that is complementary with inner bolt, the point of hollow screw is in axial direction gone up the bulge that evenly cuts out pintongs from the tip outside; After the cone point of the rip-panel of bulge to the blind hole road;
One inner bolt that is complementary with the blind hole road of external hollow screw, the most advanced and sophisticated position of inner bolt also is taper, afterbody is provided with screw thread and for the tetragonal body that grips usefulness.
This utility model can change screw and the contact mechanics mode of following closely the road in use when being screwed into inner bolt, effectively improve the screw resistance to plucking and exert oneself, and can find the screw implantation not at that time in operating process, can in time screw be back-outed.
Four, description of drawings
Fig. 1 is an exploded view of the present utility model, and wherein a is an external hollow screw sketch map, and b is the inner bolt sketch map;
Fig. 2 is an expansion type pedicle screw constitutional diagram;
Fig. 3 is the use swelling state figure of expansion type screw.
Symbol shown in the figure is expressed as respectively: 1. external hollow screw, 2. for the hexahedron that grips usefulness, 3. in the screw blind hole with the female thread of inner bolt coupling, the 4. external screw thread of inner bolt, 6. inner bolt 7. evenly is cut into the bulge of pintongs, 8 endoporus tips.
Five, the specific embodiment
Below in conjunction with drawings and Examples this utility model is further specified.
Referring to accompanying drawing, according to the technical solution of the utility model, a kind of medical expansion type pedicle screw is made up of external hollow screw 1 and inner bolt 6 two parts, external hollow screw 1 has point, have external screw thread, the central authorities of external hollow screw 1 that a blind hole road is arranged after the most advanced and sophisticated position, there is a blind hole road in central authorities, there is the tip 8 of taper in the blind hole road, the blind hole road is provided with the female thread 3 that is complementary with inner bolt 6, and the point of hollow screw 1 is in axial direction gone up the bulge 7 that evenly cuts out pintongs from the tip outside; After the cone point 8 of the rip-panel of bulge 7 to the blind hole road;
One inner bolt 6 that is complementary with the blind hole road of external hollow screw 1, the most advanced and sophisticated position of inner bolt 6 also is taper, afterbody is provided with screw thread 4 and for the tetragonal body that grips usefulness.
The outer surface of external hollow screw 1 is provided with for the hexahedron 2 that grips usefulness.
During use, the hexahedron portion 2 of holding the external hollow screw implants the pedicle of vertebral arch place with hollow screw 1, then, inner bolt 6 is inserted in the hole of external hollow screw, as shown in Figure 2.Hold the cubic body of inner bolt, insert inner bolt 6, the bulge 7 of outside hollow screw 1 is opened, as Fig. 3.Be screwed into outside hollow screw 1 earlier, when arriving the appropriate location, be screwed into inner bolt 6 again, make the rip-panel flare up taper gradually at the top of male screw thread 1, reach the purpose that the resistance to plucking that improves pedicle screw goes out intensity.If find that screw position is improper, the inner bolt of can back-outing earlier, open rip-panel can revert to former state, just the male screw thread of can back-outing like this.
Claims (2)
1. a medical expansion type pedicle screw is made up of external hollow screw [1] and inner bolt [6] two parts, it is characterized in that:
External hollow screw [1] has point, after the most advanced and sophisticated position external screw thread is arranged, there is a blind hole road in the central authorities of external hollow screw [1], there is the tip [8] of taper in the blind hole road, the female thread [3] that the blind hole road is provided with and inner bolt [6] is complementary, the point of hollow screw [1] is in axial direction gone up the bulge [7] that evenly cuts out pintongs from the tip outside; The cone point [8] of the rip-panel of bulge [7] to the blind hole road afterwards;
One inner bolt [6] that is complementary with the blind hole road of external hollow screw [1], the most advanced and sophisticated position of inner bolt [6] also is taper, afterbody is provided with screw thread [4] and for the tetragonal body that grips usefulness.
2. medical expansion type pedicle screw as claimed in claim 1 is characterized in that, the outer surface of described external hollow screw [1] is provided with for the hexahedron [2] that grips usefulness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03262479 CN2647255Y (en) | 2003-07-17 | 2003-07-17 | Medical expansion type pediculus arcus vertebrac screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03262479 CN2647255Y (en) | 2003-07-17 | 2003-07-17 | Medical expansion type pediculus arcus vertebrac screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2647255Y true CN2647255Y (en) | 2004-10-13 |
Family
ID=34329352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03262479 Expired - Lifetime CN2647255Y (en) | 2003-07-17 | 2003-07-17 | Medical expansion type pediculus arcus vertebrac screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2647255Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007137493A1 (en) * | 2006-05-18 | 2007-12-06 | Wei Lei | Universal expansive pedicle screw and its expanding method |
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN100384385C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen cervical vertebrae anterior screw |
| CN101502440B (en) * | 2009-03-11 | 2011-08-31 | 艾玉峰 | Absorbable expansion bone rivet |
| CN104224302A (en) * | 2014-09-02 | 2014-12-24 | 浙江科惠医疗器械有限公司 | Locking bone screw with expansionstructure |
| CN106456337A (en) * | 2015-04-17 | 2017-02-22 | 瑞特医疗技术公司 | Inbone talar dome with expandable flanges |
| CN108498155A (en) * | 2018-04-26 | 2018-09-07 | 重庆医科大学附属永川医院 | A kind of anti-rotation pedicle screw of self-locking and its application method |
| CN112137671A (en) * | 2019-06-27 | 2020-12-29 | 青岛大学附属医院 | Percutaneous pedicle screw-assisted expandable hemostasis conical device |
-
2003
- 2003-07-17 CN CN 03262479 patent/CN2647255Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100384386C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen conal arch root screw |
| CN100384385C (en) * | 2005-12-15 | 2008-04-30 | 孙海飚 | Anti-loosen cervical vertebrae anterior screw |
| WO2007137493A1 (en) * | 2006-05-18 | 2007-12-06 | Wei Lei | Universal expansive pedicle screw and its expanding method |
| CN101502440B (en) * | 2009-03-11 | 2011-08-31 | 艾玉峰 | Absorbable expansion bone rivet |
| CN104224302A (en) * | 2014-09-02 | 2014-12-24 | 浙江科惠医疗器械有限公司 | Locking bone screw with expansionstructure |
| CN106456337A (en) * | 2015-04-17 | 2017-02-22 | 瑞特医疗技术公司 | Inbone talar dome with expandable flanges |
| CN108498155A (en) * | 2018-04-26 | 2018-09-07 | 重庆医科大学附属永川医院 | A kind of anti-rotation pedicle screw of self-locking and its application method |
| CN112137671A (en) * | 2019-06-27 | 2020-12-29 | 青岛大学附属医院 | Percutaneous pedicle screw-assisted expandable hemostasis conical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130717 Granted publication date: 20041013 |