CN207804359U

CN207804359U - A kind of interlocking formula pedicle screw

Info

Publication number: CN207804359U
Application number: CN201720696521.4U
Authority: CN
Inventors: 邹伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-06-15
Filing date: 2017-06-15
Publication date: 2018-09-04
Anticipated expiration: 2027-06-15

Abstract

The utility model discloses a kind of interlocking formula pedicle screw, including main nail and pinning, main nail includes crown and rivet nut, can mutually be rotated between crown and rivet nut, and crown inner wall is equipped with the first screw thread；Rivet nut is equipped with the second screw thread, and rivet nut is equipped with lockhole；Pinning is placed in lockhole forms interlocking formula structure with main nail.Severe osteoporosis vertebra is fixed in the structure of the utility model, and the resisting pull out forces with two pieces of screws, pinning enters cortex of bone channel, and resisting pull out forces are stronger, and two pieces of mutual interlockings of screw form one, form stable interior fixed structure.

Description

A kind of interlocking formula pedicle screw

Technical field

The utility model belongs to field of medical device, and in particular to a kind of interlocking formula pedicle screw.

Background technology

Pedicle screw fixation operation is widely used lumbar vertebrae internal fixation method, but traditional pedicle screw at present Technology relies primarily on cancellous bone and the holding effect of screw is fixed, under its pullout of strength is apparent in osteoporosis case Drop, fixing intensity decline, and fixed mortality increases.Cancellous bone is the important of measurement screw fixing intensity to the holding effect of screw Index, with the gerontal patient of the degenerative diseases of lumbar vertebrae of osteoporosis, need more powerful inner stationary shaft to withdrawal force and Stability maintains postoperative spinal stabilization.

Mostly increase screw hold and stabilization by improveing the modes such as screw thread design, length and diameter change at present Property.Such as expanding screw for pedicle of vertebral arch, double os integumentale screws etc., but patients with severe osteoporosis is still difficult to obtain effective Spiral shell-nail hold and stability, this is that characteristic of the conventional pedicle screws merging channel based on cancellous bone determines.

Invention content

For the defect and deficiency of existing technology of preparing, the purpose of this utility model is to provide a kind of interlocking formula pedicle of vertebral arch screw Nail, solves the problems, such as that pedicle screw pullout of strength and stability are poor in the prior art.

To achieve the goals above, the utility model adopts the following technical solution is achieved：

A kind of interlocking formula pedicle screw, including main nail and pinning, the main nail include crown and rivet nut, the nail It can mutually be rotated between hat and rivet nut, the crown is equipped with U-type groove in hollow cylindric, described crown opening；Institute The rivet nut stated is equipped with the second screw thread, and the rivet nut is equipped with lockhole；The pinning is placed in lockhole to be formed with main nail and hand over Locking-type structure.

The utility model also has following distinguishing feature：

The axis of the lockhole intersects with the axis of rivet nut, and the angle of the axis of lockhole and the axis of rivet nut is 20 °~ 45°。

The pinning includes first end and second end, and the diameter of the second end is more than the diameter of first end, described The first end of pinning can pass through lockhole, second end rest on outside lockhole.

The pinning at least one end is equipped with screw thread.

The pinning includes the smooth bar part of the 4th screw thread at both ends, the 5th screw thread and centre, the 4th spiral shell Line and smooth bar part form the first end, and the 5th screw thread is second end.

It is connected by universal adjustment head between the crown and rivet nut, the universal adjustment head is with crown in integrated Design.

The crown is equipped with broken tail end, and the shape of the tail end is identical as the shape of crown.

The crown inner wall is equipped with the first screw thread.

Compared with prior art, the utility model has the beneficial effects that：

(1) severe osteoporosis vertebra is fixed in the interlocking formula vertebral pedicle bolt structure of the utility model, has The resisting pull out forces of two pieces of screws, pinning enter cortex of bone channel, and resisting pull out forces are stronger, and two pieces of mutual interlockings of screw are formed One, forms stable interior fixed structure.

(2) the pinning merging that the friendship sighting device of the utility model can be in the accurate agonic formula pedicle screw by interlocking In the lockhole of main nail, effectively avoids the deviation generated in pinning fixation procedure and delay fixation procedure, and then body is generated Adverse effect.

(3) the interlocking formula pedicle screw of the utility model and the connecting interface of sighting device can guarantee that pinning is accurately placed in In lockhole.

(4) overall structure of the interlocking formula pedicle screw system of the utility model is ensureing that pinning can accurately and vertebra Under the premise of pedicle screw forms interlocking formula structure, the resisting pull out forces of pedicle screw are improved, fixed structure is made more to stablize.

Description of the drawings

Fig. 1 is the interlocking vertebral pedicle bolt structure figure of the utility model.

Fig. 2 is the structure chart of the interlocking pedicle screw system of the utility model.

Fig. 3 is the structure chart of the sighting device of the utility model.

Fig. 4 is the structure chart of the sighting device and pedicle screw connector of the utility model.

The meaning of each label in attached drawing：

(1-1)-main nail, (1-2)-pinning；

(1-1-1)-crown, (1-1-2)-rivet nut, (1-1-3)-the first screw thread, (1-1-4)-groove, (1-1-5)-the second Screw thread, (1-1-6)-lockhole, (1-1-7)-U-type groove, (1-1-8)-tail end, (1-1-9)-universal adjustment head；(1-1-4-1)-is limited Position slot；

(1-2-1)-the four screw thread, (1-2-2)-the five screw thread, (1-2-3)-smooth bar part；

(2-1)-connecting rod, (2-2)-aim at arm, (2-3)-sleeve, (2-4)-guide cylinder；

(2-1-1)-protrusion, (2-1-1-1)-limited block, (2-2-1)-through-hole, (2-3-1)-third screw thread.

Explanation is further explained in detail to the particular content of the utility model with reference to embodiments.

Specific implementation mode

The utility model provides a kind of interlocking formula pedicle screw system, including interlocking formula pedicle screw and sighting device, Wherein, interlocking formula pedicle screw includes main nail 1-1 and pinning 1-2, and main nail has crown 1-1-1 and rivet nut 1-1-2, crown 1-1-1 can reach pinning installation direction with this and be set to crown U-type groove around rivet nut 1-1-2 rotations and angulation (i.e. multi-axial screws) In pitman the purpose that does not restrain mutually of installation direction.

The rivet nut of the utility model is equipped with lockhole 1-1-6, for placing pinning 1-2, pinning surface can all polished rods, Generally in order to increase the resisting pull out forces of pinning, screw thread is equipped in the one or both ends of pinning；

Preferably, the head end of pinning is equipped with the 4th screw thread 1-2-1, and tail end is equipped with the 5th screw thread 1-2-2, and centre is polished rod portion Divide 1-2-3, pinning tail end diameter to be more than stage casing smooth bar part and head end diameter, can guarantee that the small end of pinning passes through lockhole in this way, The big end of pinning is without pass through lockhole, therefore design diameter is more greatly, enhances screw intensity, prevents from being broken；Position among pinning In lockhole, it is set to smooth bar part, can guarantee the intensity of pinning in this way.

The sighting device of the utility model is connected on crown 1-1-1, and sighting device is equipped with through-hole 2-2-1, the axis of through-hole It is overlapped with the axis of lockhole 1-1-6, makes pinning 1-2 that can be moved in lockhole along the axis direction where through-hole.

Specifically, the sighting device includes connecting rod 2-1, aims at arm 2-2, sleeve 2-3 and guide cylinder 2-4；Connecting rod Connect L-shaped with arm is aimed at, connecting rod one end is equipped with protrusion 2-1-1, and rivet nut top is equipped with groove 1-1-4, convex shape It matches with the groove shapes at the top of rivet nut, when in the groove at the top of projection portion is stably mounted to rivet nut, aims on arm The axis of inclined via-hole 2-2-1, the axis of guide sleeve 2-4, lockhole 1-1-6 axis three overlap；

Sleeve 2-3 is socketed in connecting rod, and sleeve can be slided up and down along connecting rod, and barrel end is connect with crown 1-1-1, It generally is equipped with third screw thread 2-3-1 in barrel end, the first screw thread 1-1-3 is correspondingly arranged on crown inner wall, works as connecting rod When 2-1 is placed in crown, it is rotated down sleeve and has connect fixed work with the first screw thread 1-1-3 inside crown by third screw thread With.

The diameter of bore of the guide sleeve of the utility model is more than the maximum gauge of pinning, can guarantee that pinning can be in guide sleeve It is interior seamless to slide through and into lockhole.

The crown opening of the utility model is equipped with U-type groove 1-1-7, and U-type groove is for installing pitman.

The crown of the utility model is equipped with broken tail end 1-1-8, and broken tail end plays the role of extending crown, play It is reliably fixed sighting device, keeps aiming more accurate, and is conducive to the installation of pitman.

Specific embodiment of the utility model is given below, it should be noted that the utility model is not limited to following tool Body embodiment, all equivalent transformations made on the basis of the technical solutions of the present application each fall within the scope of protection of the utility model.

Embodiment 1

As shown in Figure 1, the present embodiment provides a kind of interlocking formula pedicle screw, including main nail 1-1 and pinning 1-2, main nail 1-1 includes crown 1-1-1 and rivet nut 1-1-2, by the 1-1-9 connections of universal adjustment head between crown 1-1-1 and rivet nut 1-1-2, Universal adjustment head 1-1-9 and crown 1-1-1 is in integrated design.Crown 1-1-1 is in hollow cylindric, crown 1-1-1 openings Place is equipped with U-type groove 1-1-7, and crown 1-1-1 inner walls are equipped with the first screw thread 1-1-3；Rivet nut 1-1-2 is equipped with the second screw thread 1-1- 5, rivet nut 1-1-1 are equipped with lockhole 1-1-6；Pinning 1-2 is placed in lockhole 1-1-6 forms interlocking formula structure with main nail 1-1.

The axis of lockhole 1-1-6 intersects with the axis of rivet nut 1-1-2, and the angle of the axis of lockhole and the axis of rivet nut is 20 °~45 °.

Pinning 1-2 includes first end and second end, and the diameter of second end is more than the diameter of first end, the first end energy of pinning Across lockhole 1-1-6, second end rests on outside lockhole.Pinning 1-2 includes the 4th screw thread 1-2-1, the 5th screw thread 1- at both ends 2-2 and intermediate smooth bar part 1-2-3, the 4th screw thread 1-2-1 and smooth bar part 1-2-3 form first end, the 5th screw thread 1-2-2 For second end.

Crown 1-1-1 is equipped with broken tail end 1-1-8, and the shape of tail end 1-1-8 is identical as the shape of crown 1-1-1.

Embodiment 2

As shown in Figures 1 to 4, the present embodiment provides a kind of interlocking formula pedicle screw system, including interlocking formula pedicle of vertebral arch Screw and sighting device；Wherein interlocking formula pedicle screw is same as Example 1；

Quasi- device includes connecting rod 2-1, aims at arm 2-2, sleeve 2-3 and guide cylinder 2-4；One end of connecting rod 2-1 and aiming One end connection of arm 2-2 is L-shaped, and the other end of connecting rod 2-1 is equipped with protrusion 2-1-1, raised 2-1-1 shapes and groove 1-1-4 Shape matches, and the other end for aiming at arm 2-2 is equipped with through-hole 2-2-1, and the axis of through-hole 2-2-1 is overlapped with the axis of lockhole 1-1-6, When the raised 2-1-1 in connecting rod is placed in groove 1-1-4, the axis of the through-hole 2-2-1 on arm is aimed at lockhole 1-1-6's Axis overlaps；

Raised 2-1-1 is hexagon shape, and hexagon protrusion wherein outwardly protrudes to form limited block 2-1-1-1 on one side；It is recessed Slot 1-1-4 is hexagon shape, and hexagonal indentations wherein outwardly protrude to form limiting slot 1-1-4-1 on one side, limited block 2-1-1-1 It is matched with limiting slot 1-1-4-1.The center line of limited block 2-1-1-1 and the axis of lockhole 1-1-6 are in the same plane.

Sleeve 2-3 is socketed on connecting rod 2-1, and sleeve 2-3 can be slided up and down along connecting rod 2-2, and the end of sleeve is equipped with Third screw thread 2-3-1, third screw thread 2-3-1 are matched with the first screw thread 1-1-3 inside crown；

Guide sleeve 2-4 is placed in through-hole 2-2-1, and the axis of guide sleeve 2-4 is overlapped with the axis of through-hole, guide sleeve 2-4's Diameter of bore can guarantee that pinning 2-1 is seamless and slide through and enter in lockhole 1-1-6.

Another technical solution and embodiment 1 difference lies in：Crown 1-1-1 is equipped with broken tail end 1-1-8, tail end The shape of 1-1-8 is identical as the shape of crown 1-1-1.

The course of work of the utility model：

When the interlocking pedicle screw of the utility model is fixed, main nail 1-1, the edges sleeve 2-3 of sighting device are placed in lumbar vertebrae Sliding on connecting rod 2-1, the special connection bump 2-1-1 of connecting rod 2-1 head ends matches company with the groove 1-1-4 at the top of rivet nut 1-1-2 It connects, keeps the axis of oblique through hole 2-2-1 Chong Die with the axis of lockhole 1-1-6, downslide outer sleeve 2-3 simultaneously rotates, by sleeve Third screw thread 2-3-1 and the internal thread of crown 1-1-1 are connected and fixed, and guide cylinder 2-4 is inserted into the through-hole 2-2-1 for aiming at arm 2-2 In, until guide cylinder 2-4 head ends are put into the inner cavities guide cylinder 2-4 as close possible to lockhole 1-1-6, by pinning 1-2, with the tightened nail of bottle opener 1-2 passes through sclerotin to be stayed in lockhole 1-1-6 to across lockhole 1-1-6, the smooth bar part 1-2-3 of pinning 1-2.It removes and aims at Device, main nail 1-1 pass through cross lock by pinning 1-2, to enhance the resisting pull out forces and stability of main nail 1-1.

Claims

1. a kind of interlocking formula pedicle screw, it is characterised in that：Including main nail (1-1) and pinning (1-2), the main nail (1- 1) include crown (1-1-1) and rivet nut (1-1-2), can mutually be rotated between the crown (1-1-1) and rivet nut (1-1-2), The crown (1-1-1) is equipped with U-type groove (1-1-7) in hollow cylindric, described crown (1-1-1) opening；It is described Rivet nut (1-1-2) be equipped with the second screw thread (1-1-5), the rivet nut (1-1-1) be equipped with lockhole (1-1-6)；Described Pinning (1-2) is placed in lockhole (1-1-6) forms interlocking formula structure with main nail (1-1).

2. interlocking formula pedicle screw as described in claim 1, it is characterised in that：The axis of the lockhole (1-1-6) with The axis of rivet nut (1-1-2) intersects, and the angle of the axis of lockhole and the axis of rivet nut is 20 °~45 °.

3. interlocking formula pedicle screw as described in claim 1, it is characterised in that：The pinning (1-2) includes first end And second end, the diameter of the second end are more than the diameter of first end, the first end of the pinning can pass through lockhole (1-1- 6), second end rests on outside lockhole.

4. interlocking formula pedicle screw as claimed in claim 3, it is characterised in that：The pinning at least one end is equipped with spiral shell Line.

5. interlocking formula pedicle screw as claimed in claim 4, it is characterised in that：The pinning (1-2) includes both ends The 4th screw thread (1-2-1), the 5th screw thread (1-2-2) and centre smooth bar part (1-2-3), the 4th screw thread (1-2- 1) and smooth bar part (1-2-3) forms the first end, and the 5th screw thread (1-2-2) is second end.

6. interlocking formula pedicle screw as described in claim 1, it is characterised in that：The crown (1-1-1) and rivet nut (1- It is connected by universal adjustment head (1-1-9) between 1-2), the universal adjustment head (1-1-9) is with crown (1-1-1) in one Change design.

7. interlocking formula pedicle screw as described in claim 1, it is characterised in that：The crown (1-1-1) is equipped with can Fracture tail end (1-1-8), and the shape of the tail end (1-1-8) is identical as the shape of crown (1-1-1).

8. interlocking formula pedicle screw as described in claim 1, it is characterised in that：It is set on described crown (1-1-1) inner wall There is the first screw thread (1-1-3).