CN2694918Y

CN2694918Y - Intramedullary fixed bar

Info

Publication number: CN2694918Y
Application number: CN 200420050542
Authority: CN
Inventors: 李浩宇
Original assignee: Chinese PLA General Hospital
Current assignee: Chinese PLA General Hospital
Priority date: 2004-04-30
Filing date: 2004-04-30
Publication date: 2005-04-27
Anticipated expiration: 2014-04-30

Abstract

The utility model discloses an intramedullary fixed bar, comprising a bar body, both ends of the bar body are provided with sharp parts, and a fastening structure is arranged on the bar body, wherein, the fastening structure can be an annular concave groove that is arranged around the circumference of the bar body, and is matched with a memory alloy fastening ring that is fastened at the position of the annular concave groove and covers the concave groove, and the surface of the bar body is in a smooth state. The intramedullary fixed bar of the utility model not only can make the ankle joint early unblocked to recover the function by moving upward the intramedullary fixed bar, but also can take out the intramedullary fixed bar by the bone window to avoid probably generating adverse effect on human bodies caused by the intramedullary fixed bar.

Description

The marrow internal fixation bar

Technical field

This utility model relates to a kind of human body marrow internal fixation bar, particularly relates to a kind of can moving in marrow according to the PD needs, and the marrow internal fixation bar that can take out in the human body.

Background technology

At present, treat false joint, bone does not connect at international medical domain and adopt Williams marrow internal fixation bar usually.As shown in Figure 1, Williams marrow internal fixation bar 1 inserts rod 5 by 2 and one of rods in the marrow and forms, excellent 2 smooth surfaces in the marrow, be cylindric, diameter differs, its near-end is processed to the sharp-pointed portion 6 of pyramid of diamond sample, and flat blunt far-end is provided with female thread 3, so that the identical insertion rod 5 and its temporary transient connection of external diameter.The near-end that inserts rod 5 is machined into external screw thread 4, can be screwed in the female thread of excellent 2 far-ends in the marrow the sharp-pointed portion 6 of taper that the far-end of insertion rod 5 also is processed into the diamond sample.

Treatment with common tibial pseudarthrosis is an example, the hands flitch method of Williams marrow internal fixation bar is: rod 2 in the marrow and insertion rod 5 are spun together, and the Williams marrow internal fixation bar 1 of the integral body after will screwing is squeezed in the distal tibial pulp cavity from osteotomy, through ankle joint, subtalar joint, pass from heel pad skin.Again rod 1 is driven in the wrong direction for squeezing in the proximal tibia pulp cavity and reach metaphysis near epiphyseal plate.To insert rod and 5 unscrew a circle, and take side position X ray sheet and confirm to unscrew, and fully unscrew then and insert rod 5 it is withdrawed from, and the far-end of rod 2 in the marrow is stayed in the calcaneus.

This method has definite curative effect, but also there is an open question still simultaneously in it.

One, rod is permanently stayed in the pulp cavity in the marrow.From world wide,, the report of taking-up is not arranged as yet so far for using Williams marrow internal fixation bar treatment skeleton pseudarthrosis.Though this apparatus can adopt the extraordinary material manufacture of chemical stability, as external metallic foreign body, it stays for a long time in pulp cavity still might produce certain toxic and side effects to human body.

Two, rod can't move in pulp cavity on request in the marrow, and, after the bone does not connect healing, can not take out from human body according to the PD needs, make ankle joint long-time locked and influence function of joint.Though in theory, rod can be with the growth of tibia moves on gradually in the marrow, makes the ankle joint release, and the time is very very long, and in other words, though the strong healing of pseudarthrosis, ankle joint still can not the release activity, to such an extent as to increase the weight of the function damage of ankle joint.

Summary of the invention

Therefore, the purpose of this utility model is can't move and stay for a long time defective in pulp cavity by demand at what existing marrow internal fixation bar existed, and a kind of marrow internal fixation bar that can overcome these problems is provided.

In order to achieve the above object, the technical solution adopted in the utility model is, a kind of marrow internal fixation bar is provided, and comprises a barred body, and the two ends of barred body are sharp-pointed portion, and barred body is provided with clamping structure.

Wherein, described clamping structure can be the annular groove that is provided with around the barred body circumference.

Further, can dispose the memorial alloy snap ring in the described therein annular groove.

Perhaps, the groove of wherein said clamping structure for being oppositely arranged along circumference.

Perhaps, the through hole of wherein said clamping structure for radially being provided with along barred body.

Wherein, described barred body can be cylindric or prism-shaped.

Wherein, the sharp-pointed portion at described barred body two ends can be coniform, pyramid-shaped or flat bladed.

Because this utility model is provided with clamping structure on barred body, so after the healing of human skeleton's pseudarthrosis, can pass through the secondary minor operation, on skeleton, offer the ossiculum window, utilize the clamping structure of clip instrument on bone window clip barred body, thereby move and/or take out the marrow internal fixation bar.Therefore, not only can by on move the marrow internal fixation bar, make the early stage release restore funcitons of ankle joint, can also be by taking out the marrow internal fixation bar, avoid the harmful effect that may produce human body.

Description of drawings

Below in conjunction with accompanying drawing, describe the specific embodiment of the present utility model in detail.

Fig. 1 is the structural representation of the Williams marrow internal fixation bar of normal employing in the prior art;

Fig. 2 is the structural representation of first embodiment of the present utility model;

Fig. 3 is the structure for amplifying sketch map of I portion among Fig. 2;

Fig. 4 is the perspective view of the memorial alloy snap ring in embodiment illustrated in fig. 2;

Fig. 5 is the structural representation of middle barred body embodiment illustrated in fig. 2;

Fig. 6 a-6d is an example with the operative treatment of tibial pseudarthrosis, schematically illustrates the operation process according to marrow internal fixation bar of the present utility model, wherein,

Fig. 6 a illustrates the marrow internal fixation bar from the oblique process of squeezing into distal tibial of osteotomy,

Fig. 6 b illustrates the marrow internal fixation bar driven in the wrong direction from the vola and upwards squeezes into the process of proximal tibia,

After Fig. 6 c is illustrated in pseudarthrosis healing,, through bone window clip and promote the marrow internal fixation bar, make its unlocking process by on the backbone, offering the bone window,

Fig. 6 d as required, lives the marrow internal fixation bar by the bone window clip on the backbone after being illustrated in the pseudarthrosis healing, makes it do dirt from distal tibial and holds the process of passing vola skin and taking out;

Fig. 7 is the structural representation of second embodiment of the present utility model;

Fig. 8 is the cutaway view along first kind of structure of A-A section among Fig. 7, the groove of clamping structure wherein for being oppositely arranged along circumference;

Fig. 9 is the cutaway view along second kind of structure of A-A section among Fig. 7, the through hole of clamping structure wherein for radially being provided with along barred body;

Figure 10 is a kind of structural representation according to the sharp-pointed portion of marrow internal fixation bar of the present utility model;

Figure 11 is the another kind of structural representation according to the sharp-pointed portion of marrow internal fixation bar of the present utility model.

The structural representation that cooperates a kind of driver of marrow internal fixation bar use when Figure 12 is operation.

The specific embodiment

Marrow internal fixation bar described in the utility model comprises a barred body, and the difference of itself and Williams marrow internal fixation bar is that barred body is the structure of an one, and its two ends are sharp-pointed portion, and barred body is provided with clamping structure.

Referring to Fig. 2 to 5, Fig. 2 is the structural representation of first embodiment of the present utility model, Fig. 3 is the structure for amplifying sketch map of I portion among Fig. 2, and Fig. 4 is the perspective view of the memorial alloy snap ring in embodiment illustrated in fig. 2, Fig. 5 be embodiment illustrated in fig. 2 in the structural representation of barred body.As seen from the figure, marrow internal fixation bar 11 comprises a barred body 12, and barred body 12 is structure as a whole, and its two ends have a sharp-pointed portion 14 respectively, passes human body linked groups when being used for implantation, moving or taking out barred body 12.A plurality of annular grooves 16 around the barred body circumference are set on the barred body 12 along its length, by these grooves 16, can clip and mobile barred body 12.

In the present embodiment, in each described annular groove 16, also can further dispose the snap ring 13 that a memorial alloy is made, corresponding rounded, trapezoidal or other any feasible shape of groove 16 with the cross section of snap ring 13, the outer surface of snap ring 13 is consistent with barred body 12 surfaces, thereby makes barred body 13 surfaces be level and smooth shape on the whole.The effect of snap ring 13 is to make barred body 12 to be convenient to move in pulp cavity and linked groups, and prevents that tissue from entering groove 16.Have an opening 15 on the snap ring 13, by this opening, snap ring 13 is configurable to be taken off in groove 16 and from groove 16, with clip groove 16, and mobile barred body 12.For ease of taking off and install snap ring 13, snap ring 13 can adopt a kind of memory alloy material to make, and the deliquescing at low temperatures of this material be convenient to install and remove, and after temperature was recovered, its hardness and shape was also just recovered original state.

Referring to Figure 12, be depicted as and a kind ofly cooperate with the marrow internal fixation bar, the driver 30 that the marrow internal fixation bar is squeezed in when operation.This driver comprises a sleeve 31 and a striker 35, and for ease of controlling, sleeve 31 and striker 35 have a

head

32 and 36 big than other position respectively.Sleeve 31 front ends have an internal conical surface 34 that matches with the sharp-pointed portion of marrow internal fixation bar, and inside has a through hole 33.Striker 35 can insert in the through hole 33 of sleeve 31, and can slide in through hole 33.

Fig. 6 a-6d is an example with the operative treatment of tibial pseudarthrosis, schematically illustrates the operation process according to marrow internal fixation bar of the present utility model.Usually, around the pseudarthrosis position, has sleeve shape tissue (periosteal tissue that comprises osseous tissue, fibrous tissue and pathological changes), no matter the existence of this tissue is to the pseudarthrosis after congenital or the fracture, the generation and the healing of bone reduced in the capital, therefore, before implanting marrow internal fixation bar 11, excise this tissue fully.

Referring to Fig. 6 a, at first, marrow internal fixation bar 11 is squeezed in the distal tibial pulp cavity from osteotomy, and it is passed from the vola.

Secondly, shown in Fig. 6 b, the marrow internal fixation bar driven in the wrong direction from the vola upwards squeeze into proximal tibia.In this process, can utilize driver shown in Figure 12 30, the internal conical surface 34 of sleeve 31 front ends is nested with in the sharp-pointed portion of marrow internal fixation bar, knock the head 32 of sleeve 31, rod oppositely squeezed in the proximal tibia pulp cavity (pass through osteotomy surface), till the far-end of rod enters in the calcaneus, then the striker 35 of driver 30 is penetrated in the through hole 33 of sleeve 31, impact the head 36 of striker 35, driver 30 is withdrawed from.

Stiff for preventing ankle joint, can under the situation that confirms the strong healing of pseudarthrosis, carry out the secondary minor operation, will move on the marrow internal fixation bar, make the ankle joint release.Shown in Fig. 6 c, offer ossiculum window B at proximal tibia or the normal sclerotin of pseudarthrosis nearside place, by this bone window B, at first the snap ring to corresponding position on the rod 11 carries out K cryogenic treatment, and it is taken off, and exposes the groove on barred body surface, then a clip instrument is stretched into pulp cavity from bone window B, clip promotes marrow internal fixation bar 11, thereby makes the ankle joint release in groove to proximal tibia.

According to the healing situation, also can marrow internal fixation bar 11 be taken out in tibia further by operation.Referring to Fig. 6 d, by the bone window on the backbone, utilize clip instrument clip to live the marrow internal fixation bar, it is moved down, do dirt end joint through distal tibial and pass vola skin and take out.

During concrete enforcement, clamping structure described in the utility model also can be other form.Referring to Fig. 7, be depicted as the structural representation of second embodiment of the present utility model, this marrow internal fixation bar has only a barred body 21, and its clamping structure 23 opposite disposed are on barred body 21 surfaces.

Further referring to Fig. 8, be depicted as along the cutaway view of first kind of structure of A-A section among Fig. 7, wherein, clamping structure 23 is specially some grooves 24 that are oppositely arranged along circumference.

Further referring to Fig. 9, be depicted as along the cutaway view of second kind of structure of A-A section among Fig. 7, wherein, clamping structure 23 is specially some through holes 25 that radially are provided with along barred body 21.

During concrete enforcement, the sharp-pointed portion of marrow internal fixation bar of the present utility model comprises coniform various concrete forms.Referring to Figure 10, the sharp-pointed portion 32 of marrow internal fixation bar 31 is pyramid-shaped.Referring to Figure 11, the sharp-pointed portion 32 of marrow internal fixation bar 31 is flat bladed.

During concrete enforcement, the barred body of marrow internal fixation bar of the present utility model itself also can be any feasible shapes such as cylindric, prism-shaped.

The foregoing description only is explanation this utility model, but not to restriction of the present utility model.Those of ordinary skills can make various modifications and accommodation in thought that this utility model claim is limited and scope, all these all do not exceed scope of the present utility model.

Claims

1, a kind of marrow internal fixation bar comprises a barred body, it is characterized in that the two ends of barred body have sharp-pointed portion, and barred body is provided with clamping structure.

2, marrow internal fixation bar as claimed in claim 1 is characterized in that, the annular groove of described clamping structure for being provided with around the barred body circumference.

3, marrow internal fixation bar as claimed in claim 2 is characterized in that, disposes the memorial alloy snap ring in described annular groove.

4, marrow internal fixation bar as claimed in claim 1 is characterized in that, the groove that be oppositely arranged of described clamping structure for being provided with on the barred body surface.

5, marrow internal fixation bar as claimed in claim 1 is characterized in that, described clamping structure is along the radial through hole of barred body.

6, as the described marrow internal fixation bar of above arbitrary claim, it is characterized in that described barred body is cylindric or prism-shaped.

As the described marrow internal fixation bar of arbitrary claim in the claim 1 to 5, it is characterized in that 7, that the sharp-pointed portion at described barred body two ends is is coniform, pyramid-shaped or flat bladed.