CN2587365Y

CN2587365Y - Occipitovertibrae fixator

Info

Publication number: CN2587365Y
Application number: CN 02288644
Authority: CN
Inventors: 王超
Original assignee: Peking University Third Hospital
Current assignee: Peking University Third Hospital
Priority date: 2002-11-22
Filing date: 2002-11-22
Publication date: 2003-11-26
Anticipated expiration: 2012-11-22

Abstract

The utility model discloses an occipital neck fixing device. The utility model comprises an occipital fixing plate which is composed of an arc plate section on the head end of the fixing plate and a straight plate section on the tail end of the fixing plate. A plurality of holes are arranged on the arc plate section on the head end of the occipital fixing plate, and occipital screws with sharp heads are arranged in the holes. A hole is arranged on the end of the straight plate section on the tail end of the occipital fixing plate, and a screw nail for a pedicle of a vertebral arch penetrates through the hole. A matched fixing screw nut is arranged on the screw nail for a pedicle of a vertebral arch. The fixing device with a nail plate for an atlantoaxial lateral block provided by the utility model has the advantages of simple structure and convenient operation, and an occipital and a cervical vertebra can be strongly fixed in a three-dimensional mode. Moreover, the fixing screw nail which has gradually changeable thread height is used in the fixing device, so the break resisting performance of the screw nail is improved, the operation is convenient, and the safety is ensured.

Description

Pillow neck holder

Technical field

This utility model belongs to the Orthopeadic Surgery holder, especially a kind of pillow neck holder.

Background technology

Rest the head on neck fixation (between occipital bone and dentata, fixing) for there being congenital atlas occipital bone fusion to have dentata unsettled case in extensive region to go again.At present, available fixed apparatus has pillow neck CD, Cervifix, Luque ring and Axis fixing head.These several apparatuses can not accomplish that all the most effective short segment fixes, and often should not also fix by fixed third and fourth cervical vertebra, and are bigger to the physiological activity scope influence of cervical vertebra.Therefore, not ideal pillow neck internal fixation device.In view of the foregoing, fixedly articulatio atlantoepistrophica, fixed effect are rested the head on the neck fixed apparatus reliably to be necessary to design a kind of.

Summary of the invention

The purpose of this utility model is to improve deficiency of the prior art, and provide a kind of and when implementing pillow neck fixation, fixed range can be confined between occipital bone and dentata, and fixing-stable, easy to operate, safe and reliable pillow neck holder.

The purpose of this utility model is achieved in that

The pillow neck holder that this utility model provides comprises an occipital fixation plates, and this fixing head is provided with several holes for to be made of the arc plate section of head end and the straight plate section of tail end on the head end arc plate section of this occipital fixation plates, be provided with the occipital bone screw of tip in the hole; End in the straight plate section of tail end of described occipital fixation plates is provided with a hole, this hole is preferably slotted hole, so that make this fixing head can be suitable for different patients' various fixed positions within the specific limits, in this hole, wear pedicle screw, on this pedicle screw, be provided with the hold-down nut that is complementary.

When using this pillow neck holder to implement fixation, earlier described pedicle screw is screwed into pedicle of vertebral arch, then described occipital fixation plates is pre-bent to suitable curvature according to patient's situation on the thickness direction of fixing head, also can when making this holder, described occipital fixation plates be formed in the shape that has certain curvature on its thickness direction.Hole on the fixing head upper straight-plate section is located on this pedicle screw, and the arc plate section of this fixing head and occipital bone are fitted, by the some holes on the arc plate section occipital bone screw is screwed in occipital bone, an end that makes fixing head is fixing on occipital bone, at last on pedicle screw the described hold-down nut of installing screw can finish fixing.

Using this holder fixedly in the fixing operation of occipital bone and pedicle of vertebral arch, move after in tightening the process of described hold-down nut, utilizing the pre-bending curvature of occipital fixation plates to make occipital bone and obtain to reset together with atlas, and needn't be before fixing advanced horizontal reset, like this, make operation technique easier, in addition, use this holder, postoperative does not need the cervical vertebra external fixation.

Pedicle screw on this holder is provided with a convex shoulder, this convex shoulder is divided into the section of being screwed into that is screwed in the skeleton with pedicle screw and is used for fixing the canned paragraph of connecting plate, on described section of being screwed into and canned paragraph, be equipped with screw thread, the screw thread of the section of being screwed into is preferably its end and directly has tapering on the described pedicle screw, and promptly its degree of depth is the structure that is shoaled gradually to the root at convex shoulder place by the screw taper.

The degree of depth that has the screw thread of the section of being screwed on the general screw now is consistent, the screw of this structure is not suitable for this device, because employed pedicle screw is different from and is used for breast in this extensive region dentata lateral mass nail-plate holder, the screw that lumbar vertebra etc. are located, because pedicle of vertebral arch is thinner, pedicle screw can not design too slightly, but pedicle screw needs to screw in the skeleton than the depths, and this holder is to place inside of human body for a long time, the screw that screw thread is dark excessively, the intensity of the cross section of screw is lower, fracture than being easier to, it is danger close that this screw is used for this holder.Otherwise, if use the shallow excessively screw of screw thread, then in operation, be not easy screw threads is gone in the skeleton, also may cause damage to skeleton, in addition, if screw thread is shallow excessively, screw also is pulled out in skeleton easily.And the pedicle screw that this holder provides is darker screw thread at taper, and to the root of screw, also be that screw places the stressed maximum of skeleton, the easiest place that fractures that more shallow screw thread is set, such structure both can guarantee in operation that pedicle screw successfully screws in skeleton and has stronger resistance to plucking and go out performance, and can make the stressed big part of root of this screw obtain higher intensity and non-frangibility again.

The depth of the screw thread of described pedicle screw from the root of shank of screw to taper changes the excessive danger that also can have fracture, the screw-in of the too small then screw of depth variation of screw thread also can be poor, calculate and test through theory, found out the preferred values scope that the screw thread depth of the described section of being screwed into of this pedicle screw changes, by the taper of the screw section of being screwed into to the end tapering directly of root screw thread usually 1: 12～28.When the external diameter of the screw section of being screwed into during at 3～4 millimeters, preferably 2 ± 0.5 millimeters in the footpath, the end of the taper screw thread of screw, and equate with the external diameter of screw thread at its core diameter of thread of root of screw.

The pillow neck inner fixer that this utility model provides is simple in structure, and operation technique is convenient, makes the pillow neck obtain strong three-dimensional fixation, the bone fusion rate is improved greatly, and postoperative needn't re-use external fixator.Further,, both improved the anti-performance that fractures of screw because this holder uses the pedicle screw of the depth of thread gradual change of the section of being screwed into, make it have that stronger resistance to plucking goes out performance again and in operation handled easily, guarantee safety.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

The main TV structure sketch map of the pillow neck holder that Fig. 1 provides for this utility model;

Fig. 2 is the left TV structure sketch map of holder shown in Figure 1;

Fig. 3 is the structural representation of the pedicle screw in the holder;

Fig. 4 is the fixing sketch map of occipital bone and dentata of this pillow neck holder;

Fig. 5 is the fixing sketch map of another direction of occipital bone and dentata of this pillow neck holder.

The specific embodiment

As illustrated in fig. 1 and 2, the pillow neck holder that this utility model provides comprises an occipital fixation plates 1, fixing head 1 is provided with three holes 111 for to be made of the arc plate section 11 of head end and the straight plate section 12 of tail end on the head end arc plate section 11 of occipital fixation plates 1, be provided with the occipital bone screw 2 of tip in hole 111; End in the straight plate section 12 of tail end of occipital fixation plates 1 is provided with a slotted hole 121, wears pedicle screw 3 in hole 121, is provided with the hold-down nut 4 that is complementary on pedicle screw 3.The occipital bone screw 2 very few fixedly shakinesses of on arc plate section 11, establishing, but screw 2 is too much, then to increase the complicated degree of operation and to the damage of patient's occipital bone, designing three occipital bone screws both can make and had enough fastnesses after fixing, can not make operation technique too complicated and the patient caused bigger damage again, be preferable selection therefore.

As shown in Figure 3, pedicle screw 3 on this holder is provided with a convex shoulder 32, this convex shoulder 32 is divided into section of being screwed into 31 that is screwed in the skeleton and the canned paragraph 33 that is used for fixing connecting plate with pedicle screw, the section of being screwed into 31 by taper 311 to the variation of the degree of depth of root 312 screw threads can be, by the taper 311 of the screw section of being screwed into 31 tapering 1: 12～28 to the footpath, the end of root 312 screw threads.When the external diameter of the screw section of being screwed into 31 during, directly be 2 ± 0.5 millimeters at the end of the taper screw thread of screw, and equate with the external diameter of screw thread at its core diameter of thread of root of screw at 3～4 millimeters.

Shown in Fig. 4,5, the arc plate section 11 of this holder is fixed on the occipital bone by three occipital bone screws 2, and straight plate section 12 is set on the canned paragraph 31 of the pedicle screw 3 that is screwed into the atlas pedicle of vertebral arch, and is fixing by nut 4 again.

Claims

1, a kind of pillow neck holder is characterized in that: comprise an occipital fixation plates, this fixing head is provided with several holes for to be made of the arc plate section of head end and the straight plate section of tail end on the head end arc plate section of this occipital fixation plates, be provided with the occipital bone screw of tip in the hole; End in the straight plate section of tail end of described occipital fixation plates is provided with a hole, wears pedicle screw in this hole, is provided with the hold-down nut that is complementary on this pedicle screw.

2, pillow neck holder according to claim 1, it is characterized in that: the hole that wears described pedicle screw on the described fixing head is a slotted hole.

3, pillow neck holder according to claim 1, it is characterized in that: described pedicle screw is provided with a convex shoulder, this convex shoulder is divided into the section of being screwed into that is screwed in the skeleton with pedicle screw and is used for fixing the canned paragraph of connecting plate, on described section of being screwed into and canned paragraph, be equipped with screw thread, the screw thread of the section of being screwed into of described pedicle screw directly has tapering for its end, and promptly its degree of depth is the structure that is shoaled gradually to the root at convex shoulder place by the screw taper.

4, pillow neck holder according to claim 3, it is characterized in that: the Changing Pattern of the degree of depth of the screw thread of the described section of being screwed into is: described fixing tapering with this screw thread of pedicle screw is 1: 12～28.

5, according to claim 3 or 4 described occipital bone holders, it is characterized in that:, directly be 2 ± 0.5 millimeters at the end of the taper screw thread of screw, and equate with the external diameter of screw thread at its core diameter of thread of root of screw when the external diameter of the screw section of being screwed into during at 3～4 millimeters.

6, occipital bone holder according to claim 1 is characterized in that: be provided with three holes on described occipital fixation plates head end arc plate section, be provided with the occipital bone screw of tip in the hole.

7, according to claim 1 or 2 or 3 or 4 or 6 described pillow neck holders, it is characterized in that: described occipital fixation plates is for having the shape of a curvature on its thickness direction.