CN204765862U - Excellent system of movable backbone nail - Google Patents
Excellent system of movable backbone nail Download PDFInfo
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- CN204765862U CN204765862U CN201520448918.2U CN201520448918U CN204765862U CN 204765862 U CN204765862 U CN 204765862U CN 201520448918 U CN201520448918 U CN 201520448918U CN 204765862 U CN204765862 U CN 204765862U
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- bone screw
- axle sleeve
- screw
- pitman
- movable
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Abstract
The utility model provides an excellent system of movable backbone nail, connect firmly bone screw and connect firmly bone screw including connective bar, axle sleeve, non -, the connective bar includes stiff end and expansion end, the axle sleeve cup joints and can not rotate on the expansion end, the non - connects firmly bone screw and connects firmly bone screw respectively including nail seat and nail pole, and nail seat upper end is opened flutedly respectively, is equipped with the plug screw with the recess cooperation is connected, the stiff end of connective bar is installed and is compressed tightly in connecting firmly bone screw's recess and through the plug screw, bushing installation is in the non - connects firmly bone screw's recess and compress tightly through the plug screw, the non - connects firmly bone screw and connects firmly bone screw and fixes respectively on the different vertebras of backbone. When the in -service use, when backbone holding capacity or moment, the utility model discloses it is stable both can to have kept the backbone, can bear mechanics load by backbone itself through the mating reaction that the connective bar NOT AND connected firmly bone screw again, can not produce the problem of " stress shelters from ".
Description
Technical field
This utility model relates to the medical apparatus and instruments in operation on vertebra, particularly relates to a kind of movable pedicle screw fixation system.
Background technology
In spinal surgery, pedicle screw fixation system uses usually used as internal fixation system, pedicle screw fixation system is primarily of bone screw, plug screw, pitman forms, its using method is: the assigned address first bone screw being implanted each sections of spinal column, then by apparatus, pitman is inserted in the groove of each bone screw nail seat, and use the nail seat threaded engagement of plug screw and bone screw, plug screw is made securely to be pressed in the nail seat of bone screw by pitman by the screw-down torque of screw thread, pitman and each bone screw are connected firmly completely, so complete the implantation of pedicle screw fixation system, and then maintain stablizing between each spinal segments of Post operation, replace spinal column bearing load.The power load along spinal column direction that the reasons such as the load that described spinal column bears mainly comprises: the torque load that the actions such as trunk bends and stretches, lateral bending, torsion produce spinal column, tissue gravity produce spinal column.In traditional pedicle screw fixation system, due between the parts such as bone screw, pitman for rigidity connects firmly, therefore this system easily causes " stress shielding " that power between each sections of spinal column is transmitted.Described " stress shielding " is when spinal column bears the moment produced along actions such as the unidirectional force in spinal column direction or spinal column grantee trunk bending forwards, because the rigidity between bone screw and pitman connects firmly, implanting the spinal segments of pedicle screw fixation system, the overwhelming majority of this external force or moment is born by pedicle screw fixation system instead of born by spinal column, and this phenomenon is " stress shielding ".
When " stress shielding " situation produces, stress concentrates on pedicle screw fixation system and non-spinal, this not only adds pedicle screw fixation system broken nail and to break the probability of rod, also may cause the generation of the human body unfavorable conditions such as spinal column Adjacent segment degeneration.Spinal column skeleton and attached tissue thereof, as a kind of biomaterial, also exist the phenomenon of " moving back with entering to give up ", if certain sections spinal column and attached tissue thereof do not bear mechanical loading for a long time, its risk producing tissue degeneration will increase; In addition, the implant surgery of pedicle screw fixation system usually with the bone-graft fusion operation between spinal column adjacent segment, if spinal column is correlated with between sections there is " stress shielding ", then being fused into power and will reducing between spinal column adjacent segment.More than comprehensive, the weak point how solving the existence of conventional spinal nail-stick system is those skilled in the art's technical issues that need to address.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of while maintenance spinal stabilization, effectively prevents the movable pedicle screw fixation system that stress shielding phenomenon occurs, to overcome the above-mentioned defect of prior art.
In order to solve the problems of the technologies described above, this utility model adopts following technical scheme: a kind of movable pedicle screw fixation system, comprise pitman, axle sleeve, the non-bone screw that connects firmly connects firmly bone screw with at least one, described pitman comprises stiff end and movable end, the cross section of described movable end is non-circular, described axle sleeve is socketed on described movable end, pitman can in axle sleeve along pitman length direction move and axle sleeve can not relative motion end rotate, described non-connect firmly bone screw and connect firmly bone screw comprise respectively nail seat and nail bar, described nail seat upper end has downward groove, what be connected with described groove fit is respectively equipped with plug screw, the stiff end of described pitman to be arranged in the groove connecting firmly bone screw and to be compressed by plug screw, described axle sleeve is arranged on and non-ly connects firmly in the groove of bone screw and to be compressed by plug screw, describedly non-ly connect firmly bone screw and connect firmly bone screw and be separately fixed on the different vertebras of spinal column.
Preferably, the outer wall of described axle sleeve is provided with outerplanar, and the lower end of described plug screw is plane, and described plug screw connects firmly after bone screw groove fit is connected with non-, and the plane of its lower end is pressed against on the outerplanar of axle sleeve, and axle sleeve can not be rotated relative to the non-bone screw nail seat that connects firmly.
Preferably, the movable end of described pitman is provided with and prevents that axle sleeve is deviate from, dismountable limiting section.
Further, an end margin of described axle sleeve is provided with outward extending spacing preiection, and described axle sleeve is arranged on non-connecting firmly after in bone screw with pitman, and described spacing preiection is between the limiting section and the non-nail seat connecting firmly bone screw of pitman.
Preferably, the described non-upper width connecting firmly bone screw upper groove is less than lower width, and described axle sleeve inserts groove from groove lower, transverse.
Preferably, the cross sectional shape of described movable end is regular polygon.
Preferably, described pitman is Titanium rod.
As mentioned above, the movable pedicle screw fixation system of this utility model, has following beneficial effect:
Pitman in movable pedicle screw fixation system of the present utility model connects firmly bone screw with non-and connect firmly bone screw and coordinate respectively, pitman connects firmly with non-part that bone screw coordinates can to realize position movement because of the effect of axle sleeve, namely can allow non-connect firmly bone screw and connect firmly between bone screw have certain displacement, form one by said structure by entire system and partly connect firmly state.When practical application, when spinal column holding capacity or moment, this utility model both can limit the displacement of each sections of spinal column, maintained spinal stabilization with this; Spinal column itself can be allowed to bear mechanical loading by pitman and the non-mating reaction connecting firmly bone screw again, the problem of " stress shielding " can not be produced; Further, because use this utility model can not produce the problem of " stress shielding ", and then also just can improve the success rate of the bone-graft fusion operation between spinal column adjacent segment.More than comprehensive, it is use promotional value that this utility model has very high.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of this utility model.
Fig. 2 is another kind of structural representation of the present utility model.
Fig. 3 is A place enlarged drawing in Fig. 1.
Fig. 4 is the structure chart of this utility model bottom bracket axle.
Fig. 5 is the cooperation schematic diagram of this utility model bottom bracket axle and pitman.
Fig. 6 non-ly in this utility model connects firmly bone screw axonometric chart.
Fig. 7 non-ly in this utility model connects firmly bone screw front view
Fig. 8 connects firmly bone screw axonometric chart in this utility model.
Fig. 9 connects firmly bone screw front view in this utility model.
Figure 10 is using method reference diagram of the present utility model.
In figure: 1, pitman 11, stiff end
12, movable end 13, limiting section
2, axle sleeve 21, outerplanar
22, spacing preiection 31, non-ly connect firmly bone screw
311, nail seat 312, nail bar
313, groove 32, connect firmly bone screw
321, nail seat 322, nail bar
323, groove 4, plug screw
Detailed description of the invention
The structure that Figure of description illustrates, ratio, size etc., content all only in order to coordinate description to disclose, understand for person skilled in the art scholar and read, and be not used to limit the enforceable qualifications of this utility model, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under effect that this utility model can produce and the object that can reach, all should still drop in scope that technology contents that this utility model discloses can contain.Simultaneously, quote in this description as " on ", D score, "front", "rear", the term such as " centre ", also only for ease of understanding of describing, and be not used to limit the enforceable scope of this utility model, the change of its relativeness or adjustment, under changing technology contents without essence, when being also considered as the enforceable category of this utility model.
As shown in Fig. 1-Fig. 9, a kind of movable pedicle screw fixation system of this utility model, comprise that pitman 1,2, one, axle sleeve are non-connects firmly bone screw 31 and at least one connects firmly bone screw 32, wherein Fig. 1 is one and non-ly connects firmly bone screw 31 and one and connect firmly the system that bone screw 32 forms, Fig. 2 is one and non-ly connects firmly bone screw 31 and two and connect firmly the systems that bone screw 32 forms, and it specifically uses according to reality determines.Pitman 1 described in this utility model comprises stiff end 11 and movable end 12, the cross section of described movable end 12 is non-circular, described axle sleeve 2 is socketed on the movable end 12 of described pitman 1, pitman 1 to move and axle sleeve 2 can not rotate by relative motion end 12 along pitman 1 length direction in axle sleeve 2, namely the intracavity section shape of described axle sleeve 2 and the cross sectional shape of described movable end 12 suitable, namely as shown in Figure 4, Figure 5.Composition graphs 1, shown in Fig. 6-Fig. 9, described non-connect firmly bone screw 31 and connect firmly bone screw 32 comprise nail seat 311 respectively, 321 and nail bar 312, 322, described nail seat 311, 321 upper ends have downward groove 313, 323, with described groove 313, 323 coordinate be respectively equipped with plug screw 4, the stiff end 11 of described pitman 1 to be arranged in the groove 323 connecting firmly bone screw 32 and to be compressed by plug screw 4, described axle sleeve 2 is arranged on and non-ly connects firmly in the groove 313 of bone screw 31 and to be compressed by plug screw 4, described non-connect firmly bone screw 31 and connect firmly bone screw 32 be separately fixed on the different vertebras of spinal column.When reality uses, described pitman 1 can move along its length in axle sleeve 2.Described in this utility model non-connect firmly bone screw 31 and connect firmly in the groove 313,323 in bone screw 32 be respectively equipped with female thread, described plug screw 4 is provided with external screw thread, and described groove 313,323 is threaded with plug screw 4.
In the present embodiment, as shown in Figure 3-Figure 5, the outer wall of described axle sleeve 2 is provided with outerplanar 21, and the lower end of described plug screw 4 is plane, and described plug screw 4 connects firmly after bone screw 31 groove 313 is connected with non-, and the plane of its lower end is pressed against on the outerplanar 21 of axle sleeve 2.Plug screw 4 lower end for face contacts, therefore can prevent axle sleeve 2 from rotating relative to non-bone screw 31 nail seat 311 that connects firmly with axle sleeve 2.In other embodiments, the outer wall of described axle sleeve 2 can be provided with two symmetrical outerplanars, be provided with the inner plane coordinated with described outerplanar in the non-groove 313 connecting firmly bone screw 31, contact to reach with the face of inner plane by outerplanar and prevent axle sleeve 2 relative to the non-object connecting firmly bone screw 31 nail seat 311 and rotate.
As shown in Fig. 3 or Fig. 5, in the present embodiment, the movable end 12 of described pitman 1 is provided with and prevents that axle sleeve 2 is deviate from, dismountable limiting section 13.Further, consider that pitman 1 and axle sleeve 2 have certain relative movement after installing, may occur loosening at moving process bottom bracket axle 2, thus in order to avoid axle sleeve 2 because of loosen and skid off groove 313, an end margin of described axle sleeve 2 is provided with outward extending spacing preiection 22.When described axle sleeve 2 is arranged on non-connecting firmly after in bone screw 31 with pitman 1, described spacing preiection 22 leans and connects firmly in the nail seat 311 of bone screw 31 non-, and spacing preiection 22 is between the limiting section 13 and the non-nail seat 311 connecting firmly bone screw 31 of pitman 1, thus the shift position of restriction axle sleeve 2, prevent axle sleeve 2 from deviating from from pitman 1.
Described in the present embodiment, the upper width of the non-groove 313 connected firmly in bone screw 31 is less than lower width, and described axle sleeve 2 inserts groove 313 from groove 313 lower, transverse.The effect of this structure is: after the non-groove 313 connecting firmly bone screw 31 inserted by axle sleeve 2 and plug screw 4 is not yet screwed into time, axle sleeve 2 can not be deviate from from nut 311 upper end and lose installation site, facilitates operation technique.
In this utility model, the cross sectional shape of described movable end 12 is regular polygon, so that processing and cooperation.
Pitman 1 described in the present embodiment is Titanium rod.
For one non-connect firmly bone screw 31 and one connect firmly bone screw 32, composition graphs 1, Fig. 3-Figure 10, the concrete using method in operation of the present utility model is as described below:
1) by the non-assigned address connecting firmly bone screw 31 and connect firmly that bone screw 32 to be screwed into spinal column two sections by its nail bar 312,322, adjust the position of nail seat 311,321, so that the installation of follow-up pitman 1 is placed simultaneously.
2) by apparatus, the stiff end 11 of pitman 1 is inserted the groove 323 connecting firmly bone screw 32 nail seat 321 from top; The movable end 12 of pitman 1 is inserted from top and non-ly connects firmly the groove 313 of bone screw 31 nail seat 311, then axle sleeve 2 is inserted in the movable end 12 of pitman 1, and insert in groove 313 from groove 313 lower, transverse, then limiting section 13 is arranged on described movable end 12, namely as shown in Figure 10.Movable end 12 and the non-installation connecting firmly bone screw 31 of the middle pitman 1 of this step also can be the movable ends 12 first axle sleeve 2 being inserted in pitman 1, and mounting limit portion 13, then being inserted from top by the movable end 12 of pitman 1 by apparatus non-ly connects firmly the groove 313 of bone screw 31 nail seat 311, finally axle sleeve 2 is pushed carry out in the bottom of described groove 313 spacing.
3) plug screw 4 is screwed into the non-nail seat 311,321 connecting firmly formula bone screw 31 and connect firmly bone screw 32 by its external screw thread.By the screw-down torque of screw thread, the stiff end 11 of pitman 1 and axle sleeve 2 be securely pressed in by plug screw 4 connect firmly bone screw 32 and non-ly connect firmly in the nail seat 321,311 of bone screw 31, and then completing the implantation of pedicle screw fixation system.
After this utility model is implanted, when spinal column holding capacity or moment, because the parts in this utility model do not connect firmly completely, spinal column itself therefore can be allowed to bear the power of a part, the problem of " stress shielding " can not be produced; In addition, because action effect of the present utility model, the success rate of the bone-graft fusion operation between spinal column adjacent segment can also be improved.
In sum, the movable pedicle screw fixation system of this utility model, can solve the problem easily occurring stress shielding after pedicle screw fixation system implants spinal column.So this utility model effectively overcomes practical problems more of the prior art thus has very high value and use meaning.
Above-mentioned embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting this utility model.This utility model also has many aspects can improve under the prerequisite of overall thought, all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or change for person skilled in the art scholar.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that this utility model discloses, must be contained by claim of the present utility model.
Claims (7)
1. a movable pedicle screw fixation system, it is characterized in that, comprise pitman (1), axle sleeve (2), non-ly connect firmly bone screw (31) and at least one connects firmly bone screw (32), described pitman (1) comprises stiff end (11) and movable end (12), the cross section of described movable end (12) is non-circular, described axle sleeve (2) is socketed on described movable end (12), pitman (1) can in axle sleeve (2) along pitman (1) length direction move and axle sleeve (2) can not relative motion end (12) rotate, described non-connect firmly bone screw (31) and connect firmly bone screw (32) comprise nail seat (311 respectively, 321) and nail bar (312, 322), described nail seat (311, 321) upper end has downward groove (313, 323), with described groove (313, 323) what be connected is respectively equipped with plug screw (4), the stiff end (11) of described pitman (1) is arranged in the groove (323) connecting firmly bone screw (32) and is also compressed by plug screw (4), described axle sleeve (2) is arranged on non-connecting firmly in the groove (313) of bone screw (31) and is also compressed by plug screw (4), described non-connect firmly bone screw (31) and connect firmly bone screw (32) be separately fixed on the different vertebras of spinal column.
2. movable pedicle screw fixation system according to claim 1, it is characterized in that: the outer wall of described axle sleeve (2) is provided with outerplanar (21), the lower end of described plug screw (4) is plane, described plug screw (4) connects firmly after bone screw (31) groove (313) is connected with non-, the plane of its lower end is pressed against on the outerplanar (21) of axle sleeve (2), and axle sleeve (2) can not be rotated relative to non-bone screw (31) nail seat (311) that connects firmly.
3. movable pedicle screw fixation system according to claim 1, is characterized in that: the movable end (12) of described pitman (1) is provided with and prevents axle sleeve (2) is deviate from, dismountable limiting section (13).
4. movable pedicle screw fixation system according to claim 3, it is characterized in that: an end margin of described axle sleeve (2) is provided with outward extending spacing preiection (22), described axle sleeve (2) with pitman (1) be arranged on non-connect firmly bone screw (31) upper after, between the limiting section (13) of described spacing preiection (22) in pitman (1) and the non-nail seat (311) connecting firmly bone screw (31).
5. movable pedicle screw fixation system according to claim 1, it is characterized in that: the described non-upper width connecting firmly bone screw (31) upper groove (313) is less than lower width, described axle sleeve (2) inserts groove (313) from groove (313) lower, transverse.
6. movable pedicle screw fixation system according to claim 1, is characterized in that: the cross sectional shape of described movable end (12) is regular polygon.
7. movable pedicle screw fixation system according to claim 1, is characterized in that: described pitman (1) is Titanium rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520448918.2U CN204765862U (en) | 2015-06-25 | 2015-06-25 | Excellent system of movable backbone nail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520448918.2U CN204765862U (en) | 2015-06-25 | 2015-06-25 | Excellent system of movable backbone nail |
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| Publication Number | Publication Date |
|---|---|
| CN204765862U true CN204765862U (en) | 2015-11-18 |
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ID=54506007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520448918.2U Active CN204765862U (en) | 2015-06-25 | 2015-06-25 | Excellent system of movable backbone nail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204765862U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106618706A (en) * | 2017-03-01 | 2017-05-10 | 南方医科大学珠江医院 | All-built-in expandable biocoating spine anterior internal fixation system |
| WO2017107883A1 (en) * | 2015-12-23 | 2017-06-29 | 马向阳 | Screw-rod fixation device specially used for posterior atlantoaxial vertebrae |
-
2015
- 2015-06-25 CN CN201520448918.2U patent/CN204765862U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017107883A1 (en) * | 2015-12-23 | 2017-06-29 | 马向阳 | Screw-rod fixation device specially used for posterior atlantoaxial vertebrae |
| CN106618706A (en) * | 2017-03-01 | 2017-05-10 | 南方医科大学珠江医院 | All-built-in expandable biocoating spine anterior internal fixation system |
| CN106618706B (en) * | 2017-03-01 | 2023-10-20 | 南方医科大学珠江医院 | Full-built-in expandable biological coating anterior spinal fixation system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201807 Jiading District Jia Tang Road, Shanghai, No. 1988 Patentee after: Shanghai Sanyou medical equipment Limited by Share Ltd Address before: 201807 Jiading District Jia Tang Road, Shanghai, No. 1988 Patentee before: Shanghai Sanyou Medical Devices Co., Ltd. |