CN202859280U - Minimally invasive composite self-tapping pedicle screw - Google Patents
Minimally invasive composite self-tapping pedicle screw Download PDFInfo
- Publication number
- CN202859280U CN202859280U CN 201220566588 CN201220566588U CN202859280U CN 202859280 U CN202859280 U CN 202859280U CN 201220566588 CN201220566588 CN 201220566588 CN 201220566588 U CN201220566588 U CN 201220566588U CN 202859280 U CN202859280 U CN 202859280U
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- screw
- pedicle screw
- tapping
- minimally invasive
- threads
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Abstract
The utility model aims at defects that an existing pedicle screw is inconvenient to apply and poor in stability in the actual surgery, and provides a minimally invasive composite self-tapping pedicle screw. The minimally invasive composite self-tapping pedicle screw comprises a hollow ball head threaded nail rod and a U-shaped nail arm which are integrally arranged, wherein a hollow ball head threaded nail is provided with negative taper double line wide tooth threads, threads close to the head ball face part are compact threads, threads close to the pointed part of the screw are sparse threads, and the pointed part of the screw is further provided with a self-tapping cutting edge. Through the improvement of the minimally invasive composite self-tapping pedicle screw, the pedicle screw is easy to position and good in stability, carries out self-tapping puncture, and smooth operation of a minimally invasive spinal fusion surgery is benefited.
Description
Technical field
This utility model relates to a kind of surgical medical equipment, is specifically related to and a kind of fixing equipment in spine Wicresoft pedicle nail.
Background technology
Existing pedicle nail includes drive screw bar and U-shaped nail arm, and the drive screw bar is solid, and the spondylopathy patient is being carried out in the therapeutic process, the intersection of pedicle nail from epicentral transverse process and superior articular process need to be screwed in the pedicle of vertebral arch.The process that pedicle nail is installed is such: at first the body at pedicle of vertebral arch place is scratched one 5-7 centimetre opening, find epicentral transverse process center line and superior articular process's intersection, as point of penetration, pedicle nail is screwed in the pedicle of vertebral arch, play the effect that pedicle nail is installed.There is following deficiency in operation like this: because the operator in the process that pedicle nail is screwed in skewness may occur in the operation, cause pedicle nail to pass from top, bottom, inboard or the outside of pedicle of vertebral arch, the inboard that is inclined to top, bottom or the pedicle of vertebral arch of pedicle of vertebral arch when pedicle nail will cause nerve injury, causes sequela; Then can injured blood vessel when the outside that pedicle nail is inclined to pedicle of vertebral arch, the patient will be in peril of one's life, and safety is relatively poor.In addition, because its otch is large, need to extensively peel off the other muscle of sour jujube, wound area is larger, causes the patient to lose blood more, and surgical risk improves, and increases patient's misery, and convalescent period is longer.
Be screw designs with the closely-related factor of pedicle screw stability, insert screw quality, screw-bone interface and be connected with screw and be connected, wherein, key is screw-bone interface.Bone density and screw stability are proportionate.Correlational study shows, the withdrawal resistance of normal group and osteoporosis group differs 67%, and two groups of accordingly relative displacements, strain, energy on average differ all more than 16%.In general, with the increase of screw length and diameter, the contact area of screw-bone interface increases, the corresponding increase of screw stability.The withdrawal resistance of screw 60% is positioned at pedicle of vertebral arch.The spongy bone oncomelania stricture of vagina of at present pedicle screw employing is to the limited shortcoming of pedicle of vertebral arch anchoring effect.Screw extraction is apt to occur in tail end clinically at present, repeatedly bends and stretches movable shear action because this is in spinal column, and the fatigability fracture the most easily occurs.
Summary of the invention
The technical problems to be solved in the utility model is: use inconvenience, the not good deficiency of stability for existing pedicle screw in actual operation, provide a kind of Wicresoft compound self tapping pedicle nail, not only simple in structure, be easy to the location, and the self tapping puncture, good stability.
For achieving the above object, this utility model provides a kind of Wicresoft compound self tapping pedicle nail, comprise and be hollow ball heads drive screw bar and the U-shaped nail arm that is wholely set, described hollow ball heads screw is provided with the negative wide pitch thread of tapering two-wire, described is fine and close screw thread near head land portions screw thread, described is sparse screw thread near the screw tip, and described screw tip also is provided with the self tapping cutting edge.
Further, be provided with blind hole on the outer surface of described U-shaped nail arm.
Further, be provided with notch on the outer surface of described U-shaped nail arm.
This utility model compared with prior art, have following technique effect: it is fine and close screw thread that screw is contacted the pedicle of vertebral arch partial design, to increase the area of contact of screw thread and pedicle of vertebral arch sclerotin, and then the resistance to plucking that has increased pedicle screw is exerted oneself, solved the spongy bone oncomelania stricture of vagina that present pedicle screw adopts, to the limited shortcoming of pedicle of vertebral arch anchoring effect.Screw extraction is apt to occur in tail end clinically at present, repeatedly bends and stretches movable shear action because this is in spinal column, and the fatigability fracture the most easily occurs, and density composite thread pedicle screw has increased the internal diameter of nail tail end, thereby the corresponding risk that reduces screw extraction.Strengthen on the one hand the anchorage effect of screw to pedicle of vertebral arch, reduced the risk that the internal fixation of spine surgical screw is extracted and ruptured; Be provided with the self tapping cutting edge in the screw tip and help to strengthen stability in the operation, effect is more reliable.
Description of drawings
Fig. 1 is this utility model overall structure schematic diagram.
Wherein: 1. follow closely arm; 2. nail bar; 3. cutting edge.
The specific embodiment
Below in conjunction with drawings and Examples principle of the present utility model and advantage are further elaborated.
As shown in Figure 1, comprise and be hollow ball heads drive screw bar and the U-shaped nail arm that is wholely set, described hollow ball heads screw is provided with the negative wide pitch thread of tapering two-wire, described is fine and close screw thread near head land portions screw thread, described is sparse screw thread near the screw tip, and described screw tip also is provided with the self tapping cutting edge.Wherein, be provided with blind hole on the outer surface of described U-shaped nail arm.The purpose of blind hole setting is to assist the pressure bar device to play the effect of positioning supports when pressure bar, goes back simultaneously
Can strengthen the stability of pedicle nail in implantation process.
Need to prove that preferred embodiment of the present utility model comprises that the inventor is used to implement known optimal mode of the present utility model.The change of preferred embodiment is apparent for those of ordinary skills after reading above-mentioned explanation.The inventor wishes the change that the those of ordinary skill rational Application is such, and the inventor thinks and offers some clarification on different application at this and also can realize this utility model.Therefore, this utility model comprises all modifications and the equivalents of the purport of quoting in the claim, and this allows in applicable law.In addition, any combination of all possible change of above-mentioned key element is also comprised by this utility model, unless point out in addition or obvious contradiction in context at this.
Claims (3)
1. compound self tapping pedicle nail of Wicresoft, comprise and be hollow ball heads drive screw bar and the U-shaped nail arm that is wholely set, it is characterized in that: described hollow ball heads screw is provided with the negative wide pitch thread of tapering two-wire, described is fine and close screw thread near head land portions screw thread, described is sparse screw thread near the screw tip, and described screw tip also is provided with the self tapping cutting edge.
2. the compound self tapping pedicle nail of Wicresoft according to claim 1 is characterized in that, is provided with blind hole on the outer surface of described U-shaped nail arm.
3. the compound self tapping pedicle nail of Wicresoft according to claim 1 is characterized in that, is provided with notch on the outer surface of described U-shaped nail arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220566588 CN202859280U (en) | 2012-10-31 | 2012-10-31 | Minimally invasive composite self-tapping pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220566588 CN202859280U (en) | 2012-10-31 | 2012-10-31 | Minimally invasive composite self-tapping pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202859280U true CN202859280U (en) | 2013-04-10 |
Family
ID=48026047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220566588 Expired - Fee Related CN202859280U (en) | 2012-10-31 | 2012-10-31 | Minimally invasive composite self-tapping pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202859280U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI559891B (en) * | 2015-07-24 | 2016-12-01 | Intai Technology Corp | Pedicle screw , the assembiy thereof and parallel corrector |
| CN106361422A (en) * | 2015-07-24 | 2017-02-01 | 镱钛科技股份有限公司 | Pedicle screw, assembly thereof, and parallel corrector |
-
2012
- 2012-10-31 CN CN 201220566588 patent/CN202859280U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI559891B (en) * | 2015-07-24 | 2016-12-01 | Intai Technology Corp | Pedicle screw , the assembiy thereof and parallel corrector |
| CN106361422A (en) * | 2015-07-24 | 2017-02-01 | 镱钛科技股份有限公司 | Pedicle screw, assembly thereof, and parallel corrector |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20131031 |