CN211409307U

CN211409307U - Pedicle screw

Info

Publication number: CN211409307U
Application number: CN201921716362.5U
Authority: CN
Inventors: 刘俊国; 鲍野
Original assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Current assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-09-04
Anticipated expiration: 2029-10-14

Abstract

The utility model discloses a pedicle screw relates to medical instrument technical field, and wherein, above-mentioned pedicle screw includes: the screw body, be provided with the through-hole that link up it along the axial on the screw body, the screw body includes screwhead and screw rod, be equipped with the screw thread on the outer wall of screw rod, be provided with the side opening on the lateral wall of the distal end of screw rod, the side opening is perpendicular with through-hole intercommunication and axis between them, the shape of side opening is the polygon, a limit that the length of side is the longest in the polygon is the distal end of this side opening, and this limit is perpendicular with the axis direction of screw rod, when injecting bone cement in the use, smooth and easy outflow in polygonal side opening can be followed to bone cement, and thus, bone cement's fixed effectual, the phenomenon that the screw is not hard up and slides has effectively been prevented from appearing, operation quality has been.

Description

Pedicle screw

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to pedicle of vertebral arch screw.

Background

During the surgical operation, the pedicle screw can be used in the treatment process of spinal trauma, skeletal pathology or deformity correction and the like. The pedicle screw is one of the most commonly used internal fixation materials for treating the spine at home and abroad at present. The existing pedicle screws are approximately same in structure, and are easy to loosen, slide and the like in the using process, so that the internal fixing system is bent and broken, and the screws are implanted inaccurately, thereby affecting the operation quality of spinal treatment and even causing operation failure in severe cases.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the pedicle screw is provided, so that the fixing effect of bone cement is enhanced, and the implantation accuracy of the pedicle screw in the operation is improved.

The utility model provides a pedicle screw, include: the screw comprises a screw body, wherein a through hole which penetrates through the screw body along the axial direction is formed in the screw body;

the screw body comprises a screw head and a screw rod, the outer wall of the screw rod is provided with threads, and the side wall of the far end of the screw rod is provided with a side hole;

the side hole with through-hole intercommunication and axis between them is perpendicular, the shape of side hole is the polygon, a limit that the length of side is the longest in the polygon is the distal end of this side hole, and this limit with the axis direction of screw rod is perpendicular.

As a preferable scheme of the pedicle screw, the number of the side holes is multiple and is divided into at least two groups, and at least two side holes in each group are sequentially arranged at intervals along the axial direction of the screw rod.

As a preferred version of the pedicle screw, the cross-sectional area of the side holes in each set increases sequentially in the proximal to distal direction of the screw body.

As a preferred embodiment of the above pedicle screw, all the side holes in each set are identical in shape.

As a preferable scheme of the pedicle screw, the side hole is triangular.

As a preferable scheme of the pedicle screw, the side hole is an isosceles triangle or an equilateral triangle.

As a preferable scheme of the pedicle screw, two adjacent side edges of the side holes are chamfered.

As a preferable proposal of the pedicle screw, each side hole is positioned between two adjacent screw teeth.

As a preferred aspect of the above pedicle screw, the threads comprise a first thread disposed on the proximal end of the screw shaft and a second thread disposed on the distal end of the screw shaft, the pitch of the first thread being less than the pitch of the second thread.

As a preferable scheme of the pedicle screw, the pedicle screw further comprises a screw cap, and the screw head is rotatably arranged in the screw cap.

The utility model discloses a pedicle screw includes in pedicle screw: the screw body is provided with the through-hole that link up it along the axial on the screw body, and the screw body includes screwhead and screw rod, is equipped with the screw thread on the outer wall of screw rod, is provided with the side opening on the lateral wall of the distal end of screw rod, and the side opening is perpendicular with through-hole intercommunication and axis between them, and the shape of side opening is the polygon, and a limit of the longest side length is the distal end of this side opening in the polygon to this limit is perpendicular with the axis direction of screw rod. In the operation process, can flow out from the side opening of polygon after bone cement pours into from the through-hole into, make bone cement fix effectual, the anti pull-out nature of reinforcing, and then effectively prevent that the phenomenon that the screw appears not hard up, slides, improved the operation quality.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Further features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, which is to be read in connection with the accompanying drawings, which are briefly described as follows. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a pedicle screw according to an embodiment of the present invention;

fig. 2 is an enlarged schematic view of a position a in a pedicle screw provided by an embodiment of the invention;

fig. 3 is a structural connection diagram of a pedicle screw according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a pedicle screw according to an embodiment of the present invention;

in the figure: 1. a screw head; 2. a screw shaft; 3. a through hole; 4. a nail cap;

21. side holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In consideration of the problems that the existing pedicle screw is easy to bend and break in the use process and the screw implantation is inaccurate, the embodiment of the utility model provides a pedicle screw; the technique can be applied to the operation process such as spinal trauma, skeletal pathology or deformity correction, and the embodiment of the utility model is described in detail below.

The first embodiment is as follows:

a pedicle screw according to an embodiment of the invention will be described with reference to fig. 1, 2, 3 and 4.

The pedicle screw proposed by the embodiment comprises: preferably, the screw body is made of titanium alloy. Compared with other metals, the titanium alloy has high plasticity, good corrosion resistance, good low-temperature performance, good toughness and corrosion resistance and biocompatibility. Be provided with on the screw body and link up its through-hole 3 along the axial, the screw body includes screwhead 1 and screw rod 2, be equipped with the screw thread on screw rod 2's the outer wall, be provided with side opening 21 on the lateral wall of screw rod 2's the distal end, side opening 21 is perpendicular with 3 intercommunications of through-hole and axis between them, the shape of side opening 21 is the polygon, a limit that the length of side is the longest in the polygon is this side opening 21's distal end, and this limit is perpendicular with screw rod 2's axis direction, this kind of setting can be favorable to bone cement to flow out fast. During the operation, the pedicle screws are inserted vertically inside the body, and the injected bone cement can move downwards along the through holes 3 under the action of gravity until it flows out of the side holes 21.

Preferably, there are a plurality of the side holes 21, and the plurality of side holes 21 are divided into at least two groups, and at least two side holes 21 in each group are sequentially arranged at intervals in the axial direction of the screw shaft 2, for example, there are four side holes 21, and each two side holes 21 are sequentially arranged at intervals in the axial direction of the screw shaft 2; or, there are six side holes 21, and every three side holes 21 are arranged in a group at intervals along the axial direction of the screw rod 2; or, sixteen side holes 21 are provided, and every four side holes 21 are sequentially arranged at intervals in the axial direction of the screw rod 2, and the groups of side holes 21 are uniformly arranged at intervals in the circumferential direction of the screw rod 2, so that the uniformity of the outflow of the bone cement is ensured.

Specifically, the cross-sectional area of the side holes 21 in each set increases in sequence in the proximal to distal direction of the screw body. I.e. the perimeter of the side hole 21 is larger (i.e. the hole is larger) the further down the screw shaft 2. Compared with the side holes 21 with the same size, the side holes 21 with sequentially increased sizes can be adapted to the injected bone cement, namely, the injected bone cement moves downwards along the through hole 3 under the action of gravity, the bone cement gathered at the far end of the screw body is more, and therefore the side holes 21 with the relatively large sizes are more beneficial to the outflow of the bone cement, and the bone cement fixing effect is better.

All the side holes 21 in each set are identical in shape.

Usually, the polygon is a triangle, and the bottom side of the triangle is perpendicular to the axis of the screw body, so as to facilitate the outflow of bone cement. The side holes 21 are in the form of isosceles or equilateral triangles in order to be compatible with the cement coming out under the action of gravity. Thus, the edge between two equal angled corners is perpendicular to the axis of the screw body. When pouring into bone cement, bone cement is easy to move down under the action of gravity, and to a triangular side hole 21, the size of the lower part of the triangle is larger, thereby being beneficial to the bone cement to flow out at the lower part of the triangle in the pouring process, leading the bone cement to be good in fixing effect and further enhancing the anti-pulling performance.

Specifically, the chamfer between two adjacent sides of side opening 21, the angle of the corner of each side opening 21 is relatively great promptly, compares with the side opening 21 that does not set up the chamfer, has effectively reduced the siltation phenomenon of bone cement at side opening 21 corner to bone cement's velocity of flow and fixed effect have been ensured.

In addition, each side hole 21 is located between two adjacent threads, that is, each side hole 21 is uniformly arranged between two adjacent threads, so that the position of the threads is prevented from being occupied, and the continuity of the threaded connection between the screw and the bone is ensured.

The threads include a first thread disposed on the proximal end of the shaft 2 and a second thread disposed on the distal end of the shaft 2, the first thread having a pitch less than the pitch of the second thread. Therefore, in the operation process, the pedicle screw can be easily implanted into a patient body, and the fixation effect of the pedicle screw can be further enhanced through the fixation of the threads with different thread pitches.

In addition, the pedicle screw also comprises a screw cap 4, and the screw head 1 is rotatably arranged in the screw cap 4. Pedicle of vertebral arch screw uses screwhead 1 to rotate as the axle multi-angle in the head of a screw 4 promptly, and the shape and the radian of patient's spinal bone can be slightly different in the operation process, and pedicle of vertebral arch screw's the angle of placing also need go on according to the patient's condition, and this setting up of head of a screw 4 can make screw rod 2 multi-angle rotation in head of a screw 4, and then has improved the flexibility of pedicle of vertebral arch screw in the use.

The embodiment of the utility model provides a pair of pedicle screw includes: the screw body, be provided with on the screw body and link up its through-hole 3 along the axial, the screw body includes screwhead 1 and screw rod 2, be equipped with the screw on the outer wall of screw rod 2, be provided with side opening 21 on the lateral wall of screw rod 2's distal end, side opening 21 is perpendicular with 3 intercommunication of through-hole and axis between them, the shape of side opening 21 is the polygon, the one limit of the longest side length in the polygon is the distal end of this side opening 21, and this limit is perpendicular with the axis direction of screw rod 2, flow out from polygonal side opening 21 under the action of gravity after bone cement pours into from through-hole 3, and then the fixed effect of bone cement has been strengthened, it is not hard up effectively to prevent that the screw from appearing, the phenomenon of sliding appears, and can accurately with the screw through the pedicle of vertebral body screw income centrum, the operation.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A pedicle screw, comprising: the screw comprises a screw body, wherein a through hole (3) which penetrates through the screw body along the axial direction is formed in the screw body;

the screw body comprises a screw head (1) and a screw rod (2), threads are arranged on the outer wall of the screw rod (2), and a side hole (21) is formed in the side wall of the far end of the screw rod (2);

side opening (21) with through-hole (3) intercommunication and axis between them is perpendicular, the shape of side opening (21) is the polygon, the longest limit of length of side is the distal end of this side opening (21) in the polygon, and this limit with the axis direction of screw rod (2) is perpendicular.

2. The pedicle screw according to claim 1, wherein the side holes (21) are plural and divided into at least two groups, and at least two side holes (21) are formed in each group and are sequentially spaced along the axial direction of the screw shaft (2).

3. A pedicle screw as claimed in claim 2, wherein the cross-sectional area of the side holes (21) in each set increases in sequence in the proximal to distal direction of the screw body.

4. Pedicle screw according to claim 3, wherein all the side holes (21) in each set are of the same shape.

5. Pedicle screw according to claim 1, wherein the side hole (21) is triangular in shape.

6. Pedicle screw according to claim 5, wherein the side hole (21) is an isosceles or equilateral triangle.

7. Pedicle screw according to claim 6, wherein two adjacent sides of the side hole (21) are chamfered.

8. Pedicle screw according to claim 2, wherein each side hole (21) is located between two adjacent threads.

9. The pedicle screw according to claim 1, wherein the threads comprise a first thread provided on the proximal end of the screw shaft (2) and a second thread provided on the distal end of the screw shaft (2), the pitch of the first thread being smaller than the pitch of the second thread.

10. Pedicle screw according to claim 1, further comprising a screw cap (4), wherein the screw head (1) is rotatably arranged in the screw cap (4).