CN205286502U - Pedicle screw - Google Patents
Pedicle screw Download PDFInfo
- Publication number
- CN205286502U CN205286502U CN201520958578.8U CN201520958578U CN205286502U CN 205286502 U CN205286502 U CN 205286502U CN 201520958578 U CN201520958578 U CN 201520958578U CN 205286502 U CN205286502 U CN 205286502U
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- screw
- head
- spheroid
- screw cap
- groove
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- Withdrawn - After Issue
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Abstract
The utility model discloses a medical treatment surgical instruments, especially a pedicle screw. This screw comprises screw subtotal gland nut, and the screw part is equipped with the external screw thread into the double thread including the screwhead and the screw cap that interconnect on the screwhead, and the afterbody of land cap is equipped with and has internal screw thread U type recess, and its structural feature is gland nut install in U type recess, gland nut's external screw thread meshes with the internal thread of U type recess mutually, and the reason that goes up of gland nut's external screw thread is equipped with the boss at the outermost along the department. The utility model has the advantages of simple structure, intensity are high, the security performance is high, implant be difficult for skidding after internal not hard up.
Description
Technical field
This utility model relates to a kind of medical surgical instrument, especially a kind of pedicle screw.
Background technology
Pedicle screw with pitman, lateral connector with the use of time, it is necessary to be connected fixing to itself and pitman with being fixed nut. After pitman is placed in the U-shaped groove of pedicle screw, nut will be fixed it will be screwed into the U-shaped groove of pedicle screw, and be fixed between nut with U-shaped groove and be connected by screw-threaded engagement, but skidding or the phenomenon that gets loose easily occurs in this connected mode.
Pedicle screw, according to whether head of screw can rotate in screw cap, is broadly divided into directed pedicle screw and Universal pedicle screw two types. Wherein the head of screw of Universal pedicle screw is made up of the body of rod and spheroid, and the spheroid in chondritic is placed in screw cap, and spheroid can rotate in screw cap, it is achieved gimbal function. Such as Chinese invention patent 201010623046.0 disclosed " dynamic screw implant for pedicle of vertebral arch ", it uses circlip to block the spherical outer wall of screw headgear, and restriction screw is deviate from, and provides the pendulum angle of screw, it is achieved gimbal function simultaneously. Its shortcoming is affected by the elastic strength impact of circlip, and pedicle screw is after implanting, and head of screw usually there will be loosening, affects the stability of whole spinal internal fixation system; This screw is made from multiple components simultaneously, and structure is more complicated.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of simple in construction, intensity is high, security performance high, implant after not easily skid loosening pedicle screw.
The technical scheme in the invention for solving the above technical problem is: this screw is made up of bolt portion and clamp nut, bolt portion includes the head of screw and the screw cap that interconnect, head of screw is provided with the external screw thread into double thread, the afterbody of land cap is provided with female U-shaped groove, it is structurally characterized in that described clamp nut and is arranged in U-shaped groove, the external screw thread of clamp nut is meshed with the female thread of U-shaped groove, and the externally threaded upper limb of clamp nut is provided with boss at most outer place.
Bolt portion described in the utility model also includes snap ring, and head of screw and screw cap are movable connection structure; Screw cap head is provided with flange on its opening part inwall, and the inwall of screw cap is provided with draw-in groove, and draw-in groove extends the bayonet socket adjacent with U-shaped groove, and the internal diameter of draw-in groove is more than the internal diameter of bayonet socket;Head of screw is made up of the body of rod and the spheroid of integrative-structure, and spheroid is chondritic; Spheroid is positioned at screw cap head and contacts with flange, and the external diameter of spheroid is more than the internal diameter of flange; One end outer wall of snap ring is provided with the step of a circle evagination; Snap ring is positioned at draw-in groove and contacts with spheroid, and the internal diameter of snap ring is less than the external diameter of spheroid, and the external diameter of step is more than the internal diameter of bayonet socket, and the external diameter of snap ring is less than the internal diameter of bayonet socket.
Head of screw described in the utility model is the fixing integrative-structure being connected with screw cap.
Spherome surface described in the utility model is with the groove of some circle evaginations.
Screw cap afterbody described in the utility model is additionally provided with elongated portion, and is provided with wedge-shaped impression between elongated portion and screw cap afterbody.
Through bleeding holes it is additionally provided with in head of screw described in the utility model.
This utility model is compared with prior art, have the advantages that 1, this screw is provided with boss at the externally threaded upper limb of clamp nut at most outer place, when such clamp nut is arranged in the U-shaped groove of screw cap, together with the external screw thread of clamp nut can more firmly intermesh with the female thread of U-shaped groove, not easily occur skidding or the phenomenon that gets loose; 2, when the head of screw of this screw and screw cap are movable connection structure, snap ring is utilized to be stuck in screw cap head by the spheroid of head of screw, spheroid can the rotation of larger angle in screw cap, simultaneously snap ring will not produce elastic deformation, and head of screw spheroid will not produce to loosen; And be only made up of head of screw, screw cap and three parts of snap ring, simple in construction, easy for installation, Stability Analysis of Structures; 3, being provided with the groove of some circle evaginations at the spherome surface of head of screw, when spheroid is placed in screw cap head, it is possible to increase frictional force from each other, play anti-skidding effect, implanting, structure after in human body is more firm.
Accompanying drawing explanation
Fig. 1 is the front view of bolt portion in embodiment 1.
Fig. 2 is the top view of bolt portion in embodiment 1.
Fig. 3 is the sectional view of Fig. 2.
Fig. 4 is the axonometric chart of bolt portion in embodiment 1.
Fig. 5 is the sectional view in embodiment 1 after bolt portion decomposition.
Fig. 6 is the axonometric chart in embodiment 1 after bolt portion decomposition.
Fig. 7 is the screw cap of the bolt portion state diagram when rotating in embodiment 1.
Fig. 8 is the A place enlarged drawing of Fig. 7.
Fig. 9 is the front view of clamp nut in embodiment 1.
Figure 10 is the B place enlarged drawing of Fig. 9.
Figure 11 is the profile of clamp nut in embodiment 1.
Figure 12 is the axonometric chart of clamp nut in embodiment 1.
Figure 13 is the use state diagram of embodiment 1.
Figure 14 is Figure 13 state diagram after implanting human body.
Figure 15 is the front view of bolt portion in embodiment 2.
Figure 16 is the top view of bolt portion in embodiment 2.
Figure 17 is the sectional view of Figure 16.
Figure 18 is the axonometric chart of bolt portion in embodiment 2.
Figure 19 is the sectional view in embodiment 2 after bolt portion decomposition.
Figure 20 is the axonometric chart in embodiment 2 after bolt portion decomposition.
Figure 21 is the front view of bolt portion in embodiment 3.
Figure 22 is the top view of bolt portion in embodiment 3.
Figure 23 is the sectional view of Figure 22.
Figure 24 is the axonometric chart of bolt portion in embodiment 3.
Figure 25 is the sectional view in embodiment 3 after bolt portion decomposition.
Figure 26 is the axonometric chart in embodiment 3 after bolt portion decomposition.
Figure 27 is the front view of bolt portion in embodiment 4.
Figure 28 is the top view of bolt portion in embodiment 4.
Figure 29 is the sectional view of Figure 28.
Figure 30 is the axonometric chart of bolt portion in embodiment 4.
Figure 31 is the sectional view in embodiment 4 after bolt portion decomposition.
Figure 32 is the axonometric chart in embodiment 4 after bolt portion decomposition.
Figure 33 is the front view of bolt portion in embodiment 5.
Figure 34 is the top view of bolt portion in embodiment 5.
Figure 35 is the sectional view of Figure 34.
Figure 36 is the axonometric chart of bolt portion in embodiment 5.
Figure 37 is the front view of bolt portion in embodiment 6.
Figure 38 is the top view of bolt portion in embodiment 6.
Figure 39 is the sectional view of Figure 38.
Figure 40 is the axonometric chart of bolt portion in embodiment 6.
Detailed description of the invention
Embodiment 1:
Referring to Fig. 1 Figure 12, the present embodiment is made up of bolt portion and clamp nut 3, and bolt portion includes head of screw 1, screw cap 2 and snap ring 4, and wherein head of screw 1 and screw cap 2 are movable connection structure, and head of screw 1 is provided with the external screw thread into double thread. The afterbody of land cap 2 is provided with female U-shaped groove 21, and clamp nut 3 is arranged in U-shaped groove 21, and the external screw thread of clamp nut 3 is meshed with the female thread of U-shaped groove 21, and the externally threaded upper limb of clamp nut 3 is provided with boss 31 at most outer place. Boss 31 makes together with the external screw thread of clamp nut 3 can more firmly intermesh with the female thread of U-shaped groove 21, not easily to be occurred skidding or the phenomenon that gets loose.
Screw cap 2 head is provided with flange 22 on its opening part inwall, and the inwall of screw cap 2 is provided with the draw-in groove 23 of annular, and draw-in groove 23 extends the bayonet socket 24 adjacent with U-shaped groove 21, and the internal diameter of draw-in groove 23 is more than the internal diameter of bayonet socket 24.
Head of screw 1 is made up of the body of rod 11 and the spheroid 12 of integrative-structure, and the body of rod 11 is provided with the external screw thread into double thread; Spheroid 12 is in chondritic, and spheroid 12 surface is with the groove 13 of some circle evaginations. The external diameter of spheroid 12 is more than the internal diameter of flange 22;
One end outer wall of snap ring 4 is provided with the step 41 of a circle evagination; The internal diameter of snap ring 4 is less than the external diameter of spheroid 12, and the snap ring 4 external diameter at step 41 place is more than the internal diameter of bayonet socket 24, and the external diameter of snap ring 4 body part is less than the internal diameter of bayonet socket 24.
During assembling, according to the assembly direction in Fig. 6, first loading in screw cap 2 by head of screw 1, spheroid 12 is positioned at screw cap 2 head and contacts with flange 22; Again snap ring 4 is loaded in screw cap 2, due to snap ring 4 body part external diameter less than the internal diameter of bayonet socket 24, the snap ring 4 external diameter at step 41 place more than the internal diameter of bayonet socket 24, draw-in groove 23 internal diameter more than the internal diameter of bayonet socket 24, therefore the body part of snap ring 4 enters in draw-in groove 23 after bayonet socket 24, step 41 cannot pass through bayonet socket 24, now with instrument, snap ring 4 is applied external force, step 41 enters in draw-in groove 23 under external force after bayonet socket 24, such snap ring 4 just fully enters in draw-in groove 23, snap ring 4 is fixed in draw-in groove 23, and contacts with spheroid 12. Thus achieve and be fixed on rotating for the spheroid 12 of head of screw 1 in screw cap 2. Referring to Fig. 7, the rotational angle of spheroid 12 controls, within 50 degree, to facilitate operation technique. Groove 13 on spheroid 12 can increase the frictional force between spheroid 12 and screw cap 2, plays anti-skidding effect.
Referring to Figure 13 and Figure 14, when the present embodiment uses with lateral connector 6, pitman 7 with the use of. After pitman 7 puts into the U-shaped groove 21 of screw cap 2, being screwed in U-shaped groove 21 by clamp nut 3, both are fixed together by screw-threaded engagement, thus being fixed in screw cap 2 by pitman 7.
Embodiment 2:
Referring to Figure 15 Figure 20, the present embodiment is provided with elongated portion 5 at screw cap 2 afterbody, and is provided with wedge-shaped impression 51 between elongated portion 5 and screw cap 2 afterbody. The effect of elongated portion 5 is in use to be conducive to connecting pitman 7, and waiting fractures elongated portion 5 after installing pitman 7 again gives up.
All the other structures of the present embodiment are all identical with embodiment 1 with using method.
Embodiment 3:
Referring to Figure 21 Figure 26, the bleeding holes 14 that the present embodiment is provided with through in head of screw 1, it is used for injecting the implants such as bone cement.
All the other structures of the present embodiment are all identical with embodiment 1 with using method.
Embodiment 4:
Referring to Figure 27 Figure 32, the present embodiment is provided with elongated portion 5 at screw cap 2 afterbody, and is provided with wedge-shaped impression 51 between elongated portion 5 and screw cap 2 afterbody. The effect of elongated portion 5 is in use to be conducive to connecting pitman 7, and waiting fractures elongated portion 5 after installing pitman 7 again gives up. The bleeding holes 14 that the present embodiment is also provided with through in head of screw 1, is used for injecting the implants such as bone cement.
All the other structures of the present embodiment are all identical with embodiment 1 with using method.
Embodiment 5:
Referring to Figure 33 Figure 36, the present embodiment is made up of bolt portion and clamp nut 3, and it is the fixing integrative-structure connected that bolt portion includes head of screw 1 and screw cap 2, head of screw 1 and screw cap 2, and head of screw 1 is provided with the external screw thread into double thread. . The afterbody of land cap 2 is provided with female U-shaped groove 21, and clamp nut 3 is arranged in U-shaped groove 21, and the external screw thread of clamp nut 3 is meshed with the female thread of U-shaped groove 21, and the externally threaded upper limb of clamp nut 3 is provided with boss 31 at most outer place. Boss 31 makes together with the external screw thread of clamp nut 3 can more firmly intermesh with the female thread of U-shaped groove 21, not easily to be occurred skidding or the phenomenon that gets loose.
The using method of the present embodiment is identical with embodiment 1.
Embodiment 6:
Referring to Figure 37 Figure 40, the present embodiment is provided with elongated portion 5 at screw cap 2 afterbody, and is provided with wedge-shaped impression 51 between elongated portion 5 and screw cap 2 afterbody. The effect of elongated portion 5 is in use to be conducive to connecting pitman 7, and waiting fractures elongated portion 5 after installing pitman 7 again gives up.
All the other structures of the present embodiment are identical with embodiment 5, and its using method is identical with embodiment 1.
Claims (6)
1. a pedicle screw, it is made up of bolt portion and clamp nut (3), bolt portion includes the head of screw (1) and the screw cap (2) that interconnect, head of screw (1) is provided with the external screw thread into double thread, the afterbody of screw cap (2) is provided with female U-shaped groove (21), it is characterized in that: described clamp nut (3) is arranged in U-shaped groove (21), the external screw thread of clamp nut (3) is meshed with the female thread of U-shaped groove (21), and the externally threaded upper limb of clamp nut (3) is provided with boss (31) at most outer place.
2. pedicle screw according to claim 1, is characterized in that: described bolt portion also includes snap ring (4), and head of screw (1) is movable connection structure with screw cap (2);
Screw cap (2) head is provided with flange (22) on its opening part inwall, and the inwall of screw cap (2) is provided with draw-in groove (23), draw-in groove (23) extends the bayonet socket (24) adjacent with U-shaped groove (21), and the internal diameter of draw-in groove (23) is more than the internal diameter of bayonet socket (24);
Head of screw (1) is made up of the body of rod (11) and the spheroid (12) of integrative-structure, and spheroid (12) is in chondritic;Spheroid (12) is positioned at screw cap (2) head and contacts with flange (22), and the external diameter of spheroid (12) is more than the internal diameter of flange (22);
One end outer wall of snap ring (4) is provided with the step (41) of a circle evagination; Snap ring (4) is positioned at draw-in groove (23) and contacts with spheroid (12), and the internal diameter of snap ring (4) is less than the external diameter of spheroid (12), and the external diameter of step (41) is more than the internal diameter of bayonet socket (24), and the external diameter of snap ring (4) is less than the internal diameter of bayonet socket (24).
3. pedicle screw according to claim 1, is characterized in that: described head of screw (1) is the fixing integrative-structure being connected with screw cap (2).
4. pedicle screw according to claim 2, is characterized in that: described spheroid (12) surface is with the groove (13) of some circle evaginations.
5. pedicle screw according to claim 1, is characterized in that: described screw cap (2) afterbody is additionally provided with elongated portion (5), and is provided with wedge-shaped impression (51) between elongated portion (5) and screw cap (2) afterbody.
6. pedicle screw according to claim 1, is characterized in that: be additionally provided with through bleeding holes (14) in described head of screw (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520958578.8U CN205286502U (en) | 2015-11-27 | 2015-11-27 | Pedicle screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520958578.8U CN205286502U (en) | 2015-11-27 | 2015-11-27 | Pedicle screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205286502U true CN205286502U (en) | 2016-06-08 |
Family
ID=56462858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520958578.8U Withdrawn - After Issue CN205286502U (en) | 2015-11-27 | 2015-11-27 | Pedicle screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205286502U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105434021A (en) * | 2015-11-27 | 2016-03-30 | 周建明 | Pedicle screw |
| CN106166084A (en) * | 2016-06-29 | 2016-11-30 | 江苏艾迪尔医疗科技股份有限公司 | Spine nail rod hook device |
-
2015
- 2015-11-27 CN CN201520958578.8U patent/CN205286502U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105434021A (en) * | 2015-11-27 | 2016-03-30 | 周建明 | Pedicle screw |
| CN105434021B (en) * | 2015-11-27 | 2018-06-12 | 周建明 | A kind of pedicle screw |
| CN106166084A (en) * | 2016-06-29 | 2016-11-30 | 江苏艾迪尔医疗科技股份有限公司 | Spine nail rod hook device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160608 Effective date of abandoning: 20180612 |
|
| AV01 | Patent right actively abandoned |