CN101495052A - Poly-axial bone screw mating seat - Google Patents

Abstract

Embodiments of bone securing system including a coupling element having a seat are described generally herein. Other embodiments may be described and claimed.

Description

Poly-axial bone screw mating seat

Technical field

[001] the present invention relates generally to a kind of axial bone screw, relate in particular to the multi-axial bone screw that between the male part pedestal of head of screw and bone screw, has the clamping action of improvement.

Background technology

[002] can provide bone fixation system so that bone stabilization rod or element are coupled to bone fixation means.In some systems, can between bone stabilization rod and bone fixation means, provide male part.Male part or element can be included in the contact surface between part bone fixation means and the rod.

Brief Description Of Drawings

[003] Figure 1A and 1B illustrate according to one embodiment of the invention, before system component assembling and after the perspective view of axial bone nail system.

[004] Fig. 1 C illustrates the cross sectional view of the axial bone nail system of Figure 1B.

[005] Fig. 2 A illustrates the perspective view according to the male part of one embodiment of the invention.

[006] Fig. 2 B illustrates the cross-sectional side view of the male part of Fig. 2 A.

[007] Fig. 2 C illustrates the cross-sectional top view figure of the male part of Fig. 2 A.

[008] Fig. 3 A illustrates the perspective view according to the male part of another embodiment of the present invention.

[009] Fig. 3 B illustrates the cross-sectional, top view of the male part of Fig. 3 A.

[0010] Fig. 4 A illustrates the cross-sectional side view of multiaxis to bone fixation system.

[0011] Fig. 4 B illustrates the enlarged drawing of the contact surface between the flexible J-shape pedestal of male part of bone fixation means head and Fig. 4 A.

Preferred forms of the present invention

[0012] Figure 1A illustrates according to the multiaxis of the embodiment of the invention exploded view to bone fixation system 10.This multiaxis comprises that to bone fixation system 10 bone fixation means 12, rod arrive the male part 22 of bone fixation means, saddle 29 and cooperate medicated cap 28.In an embodiment, bone fixation means 12 has threaded shank portion 14 (screw thread is not shown), head part 16, tip 18, cervical region part 20.Can construct most advanced and sophisticated 18 to pierce through patient's bone and to be positioned on the threaded shank portion 14 far-end relative with bone fixation element head part 16.Bone fixation means 12 can be a pedicle screw in one embodiment.

[0013] cervical region part 20 can be positioned between screw head 16 and the threaded rod 14.In an embodiment, the width of cervical region part 20 is littler than the width of threaded rod 14, thereby can strengthen the multiaxis of male part 22 to motion when with 16 couplings of bone fixation means head.Male part 22 is included in the opening 24 of bottom surface, and it is configured to allow bone fixing most advanced and sophisticated 18 and threaded rod 14 to pass through.In an embodiment, bone fixation means head 16 can have crooked downside.Engageable male part 22 pedestals 30 of the curved underside of head 16 (Fig. 1 C).Male part 22 can comprise side channel or be used for receiving there bone stabilization rod 11 (Figure 1B) by the passage 26 that two arm 25A, 25B form.

[0014] bone fixation system 10 also can comprise cooperation medicated cap 28, and this cooperation medicated cap 28 comprises snap cap, interlocking medicated cap with positioning threads or the locking cap that dog screw is arranged on it.Cooperate the medicated cap 28 can be in an embodiment by transmitting downward power from rod 11, saddle 29, fixture 12 heads 16 and male part 22 pedestals 30 and rod 11 being locked in the groove 26 of male part 22.Saddle 29 can be placed in the top that is positioned at bone fixation means 12 heads 16 in the passage 26 and assists system 10 is kept together after installation in an embodiment.Saddle 29 can have basal surface, and it is configured to lean against on the upper surface of fixture 12 heads 16, and aduncate top surface is used for receiving ordinatedly cylindrical rod 11.

[0015] in one embodiment, saddle 29 can be used as intermediate structure so that the load forces uniform distribution on bone fixation means 12 heads 16 top surfaces, and this load forces produces by cooperating medicated cap 28 to be screwed into the on the rod 11.Coupling head 22 comprise pedestal 30 with provide between male part 22 and bone fixation means 12 heads 16 clamp and retentivity with limit bone fixture 12 installation any with respect to male part 22 after displacement.

[0016] Figure 1B illustrates the multiaxis assembled among Figure 1A perspective view to bone fixation system.In an embodiment, bone fixation means 12 after inserting in the male part 22 by opening 24, can be driven into (to be fixed) in the bone, such as the spinal cord pedicle of vertebral arch by known technology.Bone fixation means 12 heads 16 can comprise that Hex, Phillips or other instruments cooperate opening 32 (Fig. 1 C).Fixture 12 can be driven in the bone until shoulder 20 locks male part 22 with permission and cooperate the multiaxis between medicated cap 28 bone fixation means 12 heads 16 before to connect to the joint.Rod 11 can be inserted in the passage 26 after bone fixation means 12 is installed in the bone.

[0017] can adjust rod 11 locks up to cooperation medicated cap 28 relative rods 11 to form expected relationship with bone fixation means 12 with male part 22.Fig. 1 C is the cross-sectional side view of bone fixation system 10 A-A along the line shown in Figure 1B.In an embodiment, bone fixation means head 16 downsides are engageable and rest on male part 12 pedestals 30.Pedestal 30 can be determined the shape of opening 24.

[0018] Fig. 2 A is the side perspective view according to the male part 22 of the embodiment of the invention.Fig. 2 B is the cross-sectional side view of male part 22 A-A along the line of Fig. 2 A, and Fig. 2 C is the cross-sectional, top view of the male part 22 of Fig. 2 A and 2B.Male part 22 comprises that polygon 31 pedestals 30 provide the contact surface of discrete number or put 34 and is used for engage bone fixture 12 heads 16 downsides.

[0019] male part 22 can comprise equally that antelabium 36 is used for the flange of engagement fit medicated cap 28 or projection so that rod 11, male part 22 and bone fixation means 12 are coupled regularly.Shown in Fig. 2 C, polygon 31 pedestals 30 can be configured to comprise to have eight not octagonal polygons of ipsilateral or face 31.When bone fixation means head 16 places multiaspect pedestal 30 and when cooperating medicated cap 28 to press to pedestal 30, discrete frictional or chucking power can mainly be created on each limit of polygon pedestal 30 or the point of interface 34 that near the point face 34 centers shows.

[0020] by a discrete contact point is provided, pedestal 30 can provide bone fixation means 12 heads 16 of increase and the chucking power between the male part 22.In an embodiment, when bone fixation means 12 heads 16 were pressed in the pedestal 30, the main contact between head 16 and the pedestal 30 concentrated on or close point 34.Because discrete individual contact 34, reaction load and head 16 are in the distortion of pedestal contact surface 30, polygon 31 pedestals 30 can provide the clamping action that improves between male part 22 and bone fixation means 12 heads 16.When cooperating medicated cap 38 to pin by being positioned at the pressure of point 34 or stress, pedestal contact surface 30 can be out of shape on each contact point 34.In an embodiment, pedestal 30 discrete contact points 34 can significantly increase the power on each zone between male part 22 and the fixture 12.

[0021] Fig. 3 A is the perspective view according to another male part 40 of the embodiment of the invention.Male part 40 comprises and is used to receive excellent (not shown) in wherein passage 42 and have the pedestal 44 of a discrete tip 46.Each tip 46 can curve inwardly at the base section of male part 40.Fig. 3 B is male part 40 cross-sectional, top view.When bone fixation means 12 heads 16 place and press on the pedestal 44, its engageable tip 46 that should disperse.In an embodiment, the inner surface of tip 46 forms pedestal 44, and according to the above-mentioned frictional force that increase is provided between bone fixation means 12 heads 16 and pedestal 44 about the principle of male part 22.

[0022] male part 40 can provide the gentle resistance and because discrete the tip 46 and DYNAMIC DISTRIBUTION is crossed the ability of base-plates surface load of increase equally.Male part 40 can keep out and handle external force reliably and not move with respect to bone fixation means 12 in face of external force.In addition, thus tip 46 can provide the flexibility between male part 40 and bone fixation means 12 heads 16 can cross tip 46 distributed loads more fifty-fifty.

[0023] Fig. 4 A is the cross sectional view according to the bone fixation system 50 of the embodiment of the invention, and Fig. 4 B is the amplification diagrammatic sketch of system's 50 parts.Bone fixation system 50 comprises bone fixation means 52, cervical region part 60, tip 58 and the spherical threaded head 56 with threaded rod 54.In an embodiment, cervical region part 60 than threaded rod 54 narrow with the multiaxis that allows to increase between male part 62 and the bone fixation means 52 to joint motions.Coupling head 62 can comprise that U-shaped passage 64 is used to receive bone stabilization rod 11 in wherein.

[0024] system 50 can comprise and cooperates medicated cap 68 (such as snap cap) to be configured to be received and to be locked in the chamber 66 of respective shapes of male part 62.Chamber 66 can comprise that ledge 70 is configured to cooperation medicated cap 68 is locked in the chamber 66.Shown in Fig. 4 B, male part 62 can comprise the circular J-shaped pedestal 71 with J-shaped antelabium 72.J-shaped pedestal 71 can be configured to flexibly bone fixation means 52 heads 56 are remained in the male part 62.J-shaped base-plates surface antelabium 72 can provide stronger performance keeping out and the load between base-plates surface 71 and the head 56 of distributing, thereby the tip that takes place because of external force shifts or ruptures less.In an embodiment, pedestal 72 may be partitioned into discrete the J-shaped antelabium 72 similar in appearance to the tip 46 shown in Fig. 3 A.

[0025] accompanying drawing that forms this paper part as an illustration and the unrestricted specific embodiment that wherein can implement theme that illustrates.The embodiment that illustrates has described enough details so that those skilled in the art carry out instruction disclosed herein.Can utilize and extend other embodiment with this, thus but the replacement of implementation structure and logic and variation and do not break away from the scope of the present disclosure.Therefore, this detailed description is not for restriction, and the four corner of the equivalent only authorized together with these claim by the claim of enclosing of the scope of different embodiment limits.

[0026] if in fact disclosed embodiment more than one, can use " invention " to relate to these embodiment of theme of the present invention independently or jointly, just to convenient and be not to be used for automatically the application's scope is restricted to single invention or inventive concept at this.Therefore, although this illustrate and described certain embodiments, the specific embodiment shown in any device that available desire obtains identical purpose is replaced.The disclosure is intended to cover any of different embodiment and all repackings or variation.According to top description the foregoing description and other are not made up at the embodiment of this detailed description, apparent to those skilled in the art.

[0027] summary of the present disclosure provides according to 37C.F.R. § 1.72 (b), requires summary to allow the reader to determine the disclosed essence of present technique fast.Be to be understood that it is not scope or the intension that is used to explain or limit claim.In above-mentioned detailed description,, different characteristic is accumulated among the single embodiment in order to simplify description.The method of this description is not to be interpreted as needing more feature than specified otherwise in each claim.On the contrary, can find that subject matter is less than all features of independent disclosed embodiment.Thereby incorporate the following claim of detailed description at this, each claim is independent of embodiment separately.

Claims (29)

1, a kind of male part, this male part comprises pedestal, this pedestal has the opening that the first of bone fixation means can pass through, and this opening has a discrete discontinuous contact element, the second portion that each contact element can the engage bone fixture.

2, male part as claimed in claim 1, this bone fixation means first comprises bone fixation element.

3, male part as claimed in claim 1, this bone fixation means second portion comprise to small part be spheric head.

4, male part as claimed in claim 1, at least one is deformable in the wherein limited contact element.

5, male part as claimed in claim 1, at least one of a wherein limited contact element are flexible.

6, male part as claimed in claim 1, wherein each contact element have can engage bone fixture second portion contact point.

7, male part as claimed in claim 1, at least one of a wherein limited contact element comprises tip.

8, male part as claimed in claim 1, wherein male part is coupled to rod with bone fixation means.

9, male part as claimed in claim 8, male part further comprises excellent receive path.

10, a kind of system comprises:

Bone fixation means;

Rod; And

Be used for bone fixation means is coupled to male part on the rod, this male part comprises pedestal, this pedestal has the opening that the first of bone fixation means can pass through, and this opening has a discrete discontinuous contact element, the second portion that each contact element can the engage bone fixture.

11, system as claimed in claim 10, this bone fixation means first comprises bone fixation element.

12, system as claimed in claim 10, this bone fixation means second portion comprise to small part be spheric head.

13, system as claimed in claim 10, at least one is deformable in the wherein limited contact element.

14, system as claimed in claim 10, at least one of a wherein limited contact element are flexible.

15, system as claimed in claim 10, wherein each contact element have can engage bone fixture second portion contact point.

16, system as claimed in claim 10, at least one of a wherein limited contact element comprises tip.

17, system as claimed in claim 10, this male part further comprises excellent receive path.

18, a kind of male part, this male part comprises pedestal, this pedestal has the opening that the first of bone fixation means can pass through, and this opening has the contact element of flexible deformable, the second portion that this contact element can flexible engage bone fixture.

19, male part as claimed in claim 18, this bone fixation means first comprises bone fixation element.

20, male part as claimed in claim 18, this bone fixation means second portion comprise to small part be spheric head.

21, male part as claimed in claim 18, wherein the contact element of this flexible deformable comprises a plurality of discrete secondary elements, the second portion that each secondary element can flexible engage bone fixture.

22, male part as claimed in claim 18, wherein the contact element of this flexible deformable comprises the antelabium of flexible deformable, the second portion that this antelabium can flexible engage bone fixture.

23, male part as claimed in claim 18, wherein this male part is coupled to rod with bone fixation means.

24, male part as claimed in claim 23, this male part further comprises excellent receive path.

25, a kind of system comprises:

Bone fixation means;

Rod; And

Be used for bone fixation means is coupled to male part on the rod, this male part comprises pedestal, this pedestal has the opening that the first of bone fixation means can pass through, and this opening has the contact element of flexible deformable, the second portion that this contact element can flexible engage bone fixture.

26, system as claimed in claim 25, this bone fixation means first comprises bone fixation element.

27, system as claimed in claim 25, this bone fixation means second portion comprise to small part be spheric head.

28, system as claimed in claim 25, wherein the contact element of this flexible deformable comprises a plurality of discrete secondary elements, the second portion that each secondary element can flexible engage bone fixture.

29, system as claimed in claim 25, wherein the contact element of this flexible deformable comprises the antelabium of flexible deformable, the second portion that this antelabium can flexible engage bone fixture.

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