CN102274071A

CN102274071A - Intramedullary nail extractor

Info

Publication number: CN102274071A
Application number: CN2010102000277A
Authority: CN
Inventors: 杨铁毅; 杨婕群; 张岩
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-11
Filing date: 2010-06-11
Publication date: 2011-12-14

Abstract

The invention relates to the field of medical science and discloses an intramedullary nail extractor. In the invention, the intramedullary nail extractor comprises an inner core and a nail puller, wherein the inner core takes the shape of a hollow cylinder and can expand after being pressed; the diameter of the inner core is smaller than that of the inner wall of an intramedullary nail; the nail puller takes the shape of a cylinder; and the diameter of the nail puller is smaller than that of the inner core. Because the inner core can expand after being pressed, the inner core expands to insert into a thread at the tail part of the intramedullary nail as the nail puller is screwed in from the hollow part of the inner core, so that the intramedullary nail can be taken out easily. Because the thread matching between the nail puller and the tail part of the intramedullary nail is not needed, the angle limitation is remarkably reduced, the wound during surgery is effectively prevented from being enlarged, and the intramedullary nail can be smoothly taken out regardless of whether the intramedullary nail is spun.

Description

Intramedullary nail extractor

Technical field

The present invention relates to medical domain, particularly the intramedullary pin in the medical domain takes out technology.

Background technology

Along with the continuous development of intramedullary pin internal fixation technology, this technology is widely used in the medical domain.So-called marrow internal fixation is meant at built-in, the inner matter with certain intensity good with human compatibility of the pulp cavity of bone far-end or near-end, to reach the fixed method of fracture end.

The marrow internal fixation internal fixation treatment that is applied to fracture is existing historical for many years.The marrow internal fixation not only can be applicable to the fracture of straight shape bone, also can be used for the fracture of slight arc bone, reaches 3 fixed purposes, and can carry out functional exercise in early days, is showing very strong vitality in clinical practice.

Behind the intramedullary pin internal fixation operation, need arrange to take out the operation of intramedullary pin according to patient's recovery.At present, mainly be by with of the inner thread mutually interlock of the vertical screw thread of nail-fetching device with the intramedullary pin afterbody, the mode of extracting intramedullary pin is taken out intramedullary pin.

Yet the present inventor finds that in the operation practical operation, because the restriction of operative incision and operation position, the nail extractor placement direction often is difficult to make the accurate interlock of screw thread, nail pulling smoothly.And nail-fetching device is thicker, needs enough appearing just to insert.If intramedullary pin was inserted dark or callus is grown into, then intramedullary pin tailing screw flight interlock difficulty needs to enlarge wound.If the relative pulp cavity of intramedullary pin is thinner, the intramedullary pin spin then appears during threaded engagement, and cause interlock tightly not to be difficult to extract intramedullary pin.The above reason of Chang Yin causes getting nail for up to a few hours clinically, and patient's post-operative recovery has also been caused considerable influence.

Summary of the invention

The object of the present invention is to provide a kind of intramedullary nail extractor, make intramedullary pin to take out easily, situation of difficult can not occur pulling out, will significantly reduce patient's wound and post-operative complication.

For solving the problems of the technologies described above, embodiments of the present invention provide a kind of intramedullary nail extractor, and intramedullary nail extractor is made up of inner core (1) and nail extractor (2);

Inner core 1 is the open circles tubular, and can expand behind the pressurized, and the diameter of inner core 1 is less than the inner diameter of intramedullary pin;

Nail extractor 2 is cylindric, and the diameter of nail extractor 2 is less than the diameter of inner core 1.

Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:

Intramedullary nail extractor is made up of inner core and nail extractor, and wherein, inner core is the open circles tubular, and can expand behind the pressurized, and the diameter of inner core is less than the inner diameter of intramedullary pin, and nail extractor is cylindric, and its diameter is less than the diameter of inner core.Because inflatable behind the inner core pressurized, therefore along with the screw-in process of nail extractor from the inner core hollow position, inner core imbeds the intramedullary pin tailing screw flight with expansion, thereby makes intramedullary pin to take out easily.Need not the screw thread coupling of nail-fetching device and intramedullary pin afterbody, angle limits significantly reduces, and effectively avoided the wound of operation to enlarge, and no matter whether intramedullary pin can spin, and all can smoothly intramedullary pin be taken out.Because inner core and nail extractor there is no being connected physically, the intramedullary nail extractor that both combine is with respect to integral type nail-fetching device of the prior art, also more tiny on volume, thereby conveniently insert and take out, thereby can reduce wound, reduce complication such as postoperative hemorrhage, infection.

Further, inner core is for adopting the expansion type inner core of high molecular polymer.Because the expansion type inner core is the normal material that adopts in the existing decoration, possessing behind the pressurized can expansible characteristic, therefore with the expansion type inner core as the inner core in the intramedullary nail extractor, can make that the present invention can simple realization, guaranteed feasibility of the present invention.

Further, inner core is the inner core by inflation or bath pressurization.Because under the enough big situation of pressure, even individual water pocket also can embed the tailing screw flight of intramedullary pin.Therefore the inner core in the intramedullary nail extractor also can be by the inner core of inflation or bath pressurization, makes the present invention to realize flexibly.

Further, nail extractor is made by metal material, can further satisfy the hardness requirement to nail extractor.

Description of drawings

Fig. 1 is the intramedullary nail extractor sketch map of first embodiment of the invention;

Fig. 2 is the sketch map of expansion type inner core 1 being implanted the intramedullary pin afterbody in the first embodiment of the invention;

Fig. 3 is the sketch map that the intramedullary pin tailing screw flight is imbedded in the inner core expansion in the first embodiment of the invention.

The specific embodiment

In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.

For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.

First embodiment of the invention relates to a kind of intramedullary nail extractor.Specifically as shown in Figure 1, this intramedullary nail extractor is made up of inner core 1 and nail extractor 2.

Wherein, inner core 1 is the open circles tubular, and can expand behind the pressurized, and the diameter of inner core 1 is less than the inner diameter of intramedullary pin.

Specifically, inner core in the present embodiment is for adopting the expansion type inner core of high molecular polymer (as polrvinyl chloride), because the expansion type inner core is the normal material that adopts in the existing decoration, possessing behind the pressurized can expansible characteristic, therefore with the expansion type inner core as the inner core in the intramedullary nail extractor, can make and the present invention's energy simple realization guarantee feasibility of the present invention.

The top of nail extractor is threaded, and mainly is designed in order to push inner core, but not for the inner thread interlock mutually of intramedullary pin afterbody, therefore the top screw thread design to nail extractor there is no specific (special) requirements.Nail extractor can be made by metal material, as being made by high strength steel, further to satisfy the hardness requirement to nail extractor.In addition, be appreciated that this nail extractor also can be made by other metal materials.

The use of the intramedullary nail extractor of present embodiment as shown in Figures 2 and 3.

At first, expansion type inner core 1 is implanted the intramedullary pin afterbody, as shown in Figure 2.Then, nail extractor is screwed in the hollow position of expansion type inner core 1, nail extractor is inserted angle do not have strict demand, along with nail extractor screws in, inner core imbeds the intramedullary pin tailing screw flight with expansion, as shown in Figure 3.In the prior art, the screw thread of intramedullary pin afterbody design is exactly nail extractor screw thread interlock with it for nail pulling the time, but in the operation practical operation, because the restriction of operative incision and operation position, the nail extractor placement direction often is difficult to make the accurate interlock of screw thread, nail pulling smoothly.And in the present embodiment, by the expansion type inner core is pressurizeed, make it screw-in along with nail extractor, imbed the intramedullary pin tailing screw flight, thereby can make nail extractor can with the intramedullary pin secure fit, reach the effect of nail extractor screw thread and the interlock of intramedullary pin tailing screw flight, and no matter whether intramedullary pin can spin, and all can easily intramedullary pin be taken out.

Owing to push the intramedullary pin tailing screw flight by the inner core expansion in the present embodiment, need not the accurate interlock of screw thread, so require very little to the nail extractor placement direction, need not to enlarge wound, the taking-up of intramedullary pin will be very easy, situation of difficult can not occur pulling out, significantly reduce patient's wound and post-operative complication.

Second embodiment of the invention relates to a kind of intramedullary nail extractor.Second embodiment and first embodiment are basic identical, and difference mainly is: in the first embodiment, inner core is for adopting the expansion type inner core of high molecular polymer (as polrvinyl chloride); And in the present embodiment, inner core is the inner core by inflation or bath pressurization.

Because under the enough big situation of pressure, even individual water pocket also can embed the tailing screw flight of intramedullary pin.Therefore the inner core in the intramedullary nail extractor also can be by the inner core of inflation or bath pressurization, makes the present invention to realize flexibly.Because the intramedullary nail extractor of present embodiment and the difference of the intramedullary nail extractor in first embodiment only are, the pressuring method difference of inner core, but the principle of taking out intramedullary pin is consistent with first embodiment, therefore also can reach the effect of first embodiment fully: make that the taking-up of intramedullary pin is very easy, situation of difficult can not occur pulling out, will significantly reduce patient's wound and post-operative complication.

Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims

1. an intramedullary nail extractor is characterized in that, described intramedullary nail extractor is made up of inner core (1) and nail extractor (2);

Described inner core (1) is the open circles tubular, and can expand behind the pressurized, and the diameter of described inner core (1) is less than the inner diameter of intramedullary pin;

Described nail extractor (2) is cylindric, and the diameter of described nail extractor (2) is less than the diameter of described inner core (1).

2. intramedullary nail extractor according to claim 1 is characterized in that, described inner core is for adopting the expansion type inner core of high molecular polymer.

3. intramedullary nail extractor according to claim 2 is characterized in that, described high molecular polymer is a polrvinyl chloride.

4. intramedullary nail extractor according to claim 1 is characterized in that, described inner core is the inner core by inflation or bath pressurization.

5. according to each described intramedullary nail extractor in the claim 1 to 4, it is characterized in that the top of described nail extractor is threaded.

6. according to each described intramedullary nail extractor in the claim 1 to 4, it is characterized in that described nail extractor is made by metal material.