Distraction type pedicle screw

Abstract

The utility model discloses a distraction type pedicle screw which comprises a root screw and a screw cap, the screw cap is fixedly connected to one end of the root screw, two supporting plates are rotatably connected to the root screw, an adjusting rod is connected to the bottom of the screw cap in a penetrating mode, and the end, extending into the root screw, of the adjusting rod is fixedly connected with a threaded pipe. The pedicle screw has the advantages that firstly, the pedicle screw is fixed on a vertebral arch, then the adjusting rod is rotated, due to the fact that the trapezoidal wedge block is matched with the adjusting rod through the threaded pipe in a threaded mode, the trapezoidal wedge block is supported between the two supporting plates in a limited mode, the pedicle screw is fixed on the pedicle screw, and the pedicle screw is fixed on the pedicle screw. The adjusting rod can drive the trapezoidal wedge block to push the supporting plate for opening, the root screw can be better fixed in the vertebral arch, then the arranged pressing seat can be rotationally fixed in the screw cap, the screw cap can be extruded and reinforced, meanwhile, the multiple screw caps can be conveniently connected in series and fixed, the structure is reasonable, and the firmness can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially relates to a kind of open type pedicle screw. BACKGROUND

[0002] With the increasing of population aging in our country, more and more osteoporosis patients need to be fixed operation due to spinal disease. However, osteoporosis seriously affects the bonding strength of the screw-bone interface, which reduces the holding force of the screw, often leading to screw loosening and withdrawal. Therefore, how to effectively improve the stability of the screw under the condition of osteoporosis and prevent screw loosening has become a difficult problem to be solved in spinal surgery.

[0003] The existing pedicle screw has certain drawbacks. The existing pedicle screw does not have lateral reinforcement effect after being directly inserted into the pedicle. It is prone to loosening after long-term use, resulting in short service life. In addition, since the pedicle is used in a straight line, the existing pedicle is not convenient for stringing and reinforcing several pedicles, so it does not have better firmness. Therefore, an open type pedicle screw is needed to solve the above problems. SUMMARY

[0004] To solve the above problems, the utility model provides an open type pedicle screw, which is realized by the following technical scheme.

[0005] An open type pedicle screw includes a pedicle and a screw cap, and the screw cap is fixedly connected to one end of the pedicle. Two supporting plates are rotatably connected to the pedicle. An adjusting rod is connected to the bottom of the screw cap. One end of the adjusting rod extending into the pedicle is fixedly connected to a threaded tube. A trapezoidal wedge is movably connected to the threaded tube. A pressure seat is fixedly connected to the inside of the screw cap.

[0006] Further, the trapezoidal wedge is threadedly connected with the adjusting rod through the threaded tube. The outer surface of the trapezoidal wedge is fixedly connected with a sliding block. The sliding groove formed in the supporting plate is in sliding connection with the sliding block.

[0007] Further, the outer surface of the supporting plate is provided with a triangular clamping block.

[0008] Further, the pressure seat is threadedly connected with the screw cap.

[0009] Further, a sleeve ring is rotatably connected to the outer surface of the pressure seat. Two lugs are fixedly connected to the sleeve ring. A connecting rod is rotatably connected to the lug. One end of the two connecting rods is provided with a through hole.

[0010] Further, the two connecting rods on the adjacent two groups of screw caps are connected through the set bolt. One end of the bolt is provided with a threaded nut.

[0011] Further, the outer surface of the nail cap is provided with a pressing groove, and the lug is connected with the nail cap through the pressing groove.

[0012] Further, the top of the pressing seat is provided with a hexagonal groove.

[0013] The beneficial effects of the utility model are that, in the working process of the device, firstly, the root nail is fixed on the pedicle, at this time, the adjusting rod is rotated, the trapezoidal wedge is threadedly matched on the adjusting rod through the threaded pipe, and the trapezoidal wedge is limited and supported between the two supporting plates, so that the adjusting rod can drive the trapezoidal wedge to push the supporting plate to be opened, the root nail can be better fixed in the pedicle, then, the pressing seat can be rotatably fixed in the nail cap, the connecting rod rotating on the pressing seat can be clamped on the nail cap, and the adjacent two nail caps are connected with each other through the connecting rod, the connecting rod connected with each other is fixed through the bolt, the plurality of nail caps can be connected and fixed in series, the structure is reasonable, and the firmness can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the specific embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0015] Figure 1 The utility model discloses a structure diagram of the open type pedicle screw.

[0016] Figure 2 The utility model discloses the connection diagram of the root nail, the supporting plate and the trapezoidal wedge.

[0017] Figure 3 The utility model discloses the enlarged view of A in the utility model. Figure 2

[0018] Figure 4 The utility model discloses the connection diagram between the two connecting rods.

[0019] Figure 5 The utility model discloses the connection diagram of the pressing seat and the connecting rod.

[0020] The signs are as follows:

[0021] 1, root nail;

[0022] 2, nail cap; 21, pressing groove; 22, adjusting rod; 221, threaded pipe;

[0023] 3, supporting plate; 31, triangular clamping block; 32, sliding groove;

[0024] ​4, trapezoidal wedge; 41, sliding block;

[0025] 5, pressing seat;

[0026] 6, collar; 61, lifting lug; 62, connecting rod;

[0027] 7, bolt; 71, nut. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] As shown in the drawings, Figures 1-5 The utility model has the following specific embodiments.

[0030] Embodiment:

[0031] A distraction type pedicle screw, comprising a root nail 1 and a nail cap 2, and the nail cap 2 is fixedly connected to one end of the root nail 1, two support plates 3 are rotatably connected to the root nail 1, an adjusting rod 22 is connected to the bottom of the nail cap 2, one end of the adjusting rod 22 extending into the root nail 1 is fixedly connected with a threaded tube 221, a trapezoidal wedge 4 is movably connected to the threaded tube 221, and a pressing seat 5 is fixedly connected to the inside of the nail cap 2.

[0032] By adopting the above technical scheme, when the device is used, first, the root nail 1 is fixed on the pedicle, at this time, the adjusting rod 22 is rotated, since the trapezoidal wedge 4 is threadedly matched with the adjusting rod 22 through the threaded tube 221, and the trapezoidal wedge 4 is limited and supported between the two support plates 3, so that the adjusting rod 22 can drive the trapezoidal wedge 4 to push the support plates 3 to be distracted, which can make the root nail 1 better fixed in the pedicle, then, the pressing seat 5 can be rotatably fixed in the nail cap 2, the rotating connecting rod 62 on the pressing seat 5 can be clamped on the nail cap 2, and the adjacent two nail caps 2 are connected with each other through the connecting rod 62, the connecting rod 62 connected with each other is fixed through the bolt 7, which is convenient for the series connection and fixation of the plurality of nail caps 2, the structure is reasonable, and the firmness can be improved.

[0033] Specifically, the trapezoidal wedge 4 is threadedly matched with the adjusting rod 22 through the threaded tube 221, the outer surface of the trapezoidal wedge 4 is fixedly connected with a sliding block 41, and the sliding groove 32 formed in the support plate 3 is slidably matched with the sliding block 41.

[0034] By adopting the above technical scheme, the sliding block 41 arranged on the trapezoidal wedge block 4 can be limited to move in the sliding groove 32 arranged on the supporting plate 3, so that the trapezoidal wedge block 4 can extrude the supporting plate 3 to rotate when the trapezoidal wedge block 4 is lifted or lowered.

[0035] Specifically, the outer surface of the supporting plate 3 is provided with a triangular clamping block 31.

[0036] By adopting the above technical scheme, the triangular clamping block 31 can increase the blocking effect.

[0037] Specifically, the pressing seat 5 is threadedly connected with the nail cap 2.

[0038] The outer surface of the pressing seat 5 is rotationally connected with a sleeve ring 6, the sleeve ring 6 is fixedly connected with two lifting lugs 61, the lifting lugs 61 are rotationally connected with connecting rods 62, and one end of each of the two connecting rods 62 is provided with a through hole.

[0039] The two connecting rods 62 on the two adjacent groups of nail caps 2 are connected through the threaded bolt 7, and one end of the threaded bolt 7 is provided with a threaded nut 71.

[0040] By adopting the above technical scheme, the sleeve ring 6 can rotate on the pressing seat 5, when the pressing seat 5 is rotationally fixed in the nail cap 2, the connecting rod 62 can be corresponded with the pressing slot 21 by rotating the sleeve ring 6, so that the connecting rod 62 can be extruded on the nail cap 2 through the pressing slot 21, when the adjacent two nail caps 2 are connected, the two connecting rods 62 on the nail cap 2 can be clamped with each other, and the threaded bolt 7 is inserted between the two connecting rods 62, and the threaded bolt 7 is matched with each other through the threaded nut 71, so that the two connecting rods 62 can be fixed, and the plurality of nail caps 2 can be conveniently connected and fixed.

[0041] Specifically, the outer surface of the nail cap 2 is provided with a pressing slot 21, and the lifting lug 61 is connected with the nail cap 2 through the pressing slot 21.

[0042] By adopting the above technical scheme, the pressing slot 21 can make the connecting rod 62 pass through and extrude on the nail cap 2.

[0043] Specifically, the top of the pressing seat 5 is provided with a hexagonal slot.

[0044] By adopting the above technical scheme, the hexagonal slot can facilitate the rotation of the pressing seat 5 in the nail cap 2.

[0045] The preferred embodiments disclosed above are only used to help describe the utility model. The preferred embodiments do not describe all the details and do not limit the utility model to the specific implementation. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the utility model, so that the person skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A pedicle screw with an expansion mechanism, comprising a pedicle screw (1) and a screw head (2), wherein the screw head (2) is fixedly connected to one end of the pedicle screw (1), characterized in that: Two support plates (3) are rotatably connected to the root nail (1). An adjusting rod (22) is connected through the bottom of the nail head (2). A threaded tube (221) is fixedly connected to one end of the adjusting rod (22) extending into the root nail (1). A trapezoidal wedge (4) is movably connected to the threaded tube (221). A pressure seat (5) is fixedly connected inside the nail head (2).

2. The pedicle screw with a spreading design according to claim 1, characterized in that: The trapezoidal wedge (4) is threadedly engaged with the adjusting rod (22) via a threaded tube (221). A slider (41) is fixedly connected to the outer surface of the trapezoidal wedge (4). The groove (32) on the support plate (3) is slidably engaged with the slider (41).

3. The pedicle screw with expansion as described in claim 1, characterized in that: The outer surface of the support plate (3) is provided with a triangular locking block (31).

4. The pedicle screw with a spreading design according to claim 1, characterized in that: The pressure seat (5) and the nail head (2) are threaded together.

5. The pedicle screw with a spreading design according to claim 4, characterized in that: The outer surface of the pressure seat (5) is rotatably connected to a collar (6), and two lifting lugs (61) are fixedly connected to the collar (6). A connecting rod (62) is rotatably connected to the lifting lug (61), and one end of each connecting rod (62) is provided with a through hole.

6. The pedicle screw with expansion according to claim 5, characterized in that: The two connecting rods (62) on the two adjacent sets of nail heads (2) are connected by a bolt (7), and one end of the bolt (7) is provided with a threaded nut (71).

7. The pedicle screw with expansion according to claim 6, characterized in that: The outer surface of the nail head (2) is provided with a pressure groove (21), and the lifting lug (61) is connected to the nail head (2) through the pressure groove (21).

8. The pedicle screw with a spreading design according to claim 1, characterized in that: The top of the pressure seat (5) is provided with a hexagonal slot.

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