CN202020527U

CN202020527U - Extensible intramedullary fixer

Info

Publication number: CN202020527U
Application number: CN2011200081655U
Authority: CN
Inventors: 梅海波
Original assignee: Changfu Medical Instruments Co Ltd Of Changsha High-Tech Zone
Current assignee: Changfu Medical Instruments Co Ltd Of Changsha High-Tech Zone
Priority date: 2011-01-12
Filing date: 2011-01-12
Publication date: 2011-11-02
Anticipated expiration: 2021-01-12

Abstract

The utility model discloses an extensible intramedullary fixer which comprises an intramedullary bar and a locking part capable of fixing two ends of the intramedullary bar into a bone, wherein the intramedullary bar comprises a sleeve and an inner core, and one end of the inner core can be nested in the cavity of the sleeve in a sliding manner. The extensible intramedullary fixer provided by the utility model has the advantages of simple structure, simplicity and convenience in implantation and installation, and reliability in fixation, and not only can fix long bones effectively but also can be extended automatically along with the skeleton growth.

Description

Extensible marrow inner fixing device

Technical field

This utility model relates to the bone inner fixing device in the clinical medicine, particularly a kind of marrow inner fixing device that can automatically prolong with bone growth.

Background technology

Excellent technology in the marrow, or be called the intramedullary pin technology is meant metal bar or nail be placed on to reach fixedly a kind of internal fixation technology of long bone fracture in the medullary cavity that the metal bar of its use promptly is referred to as in the marrow excellent.The interior rod of initial marrow is that the metal bar of Hey-Groves employing in 1916 is fixed, and the back is owing to various complication are abandoned using.Nineteen thirty-nine Kuntscher introduces the intramedullary pin technology first, has founded the biomechanical principle of marrow inner splint.The 1950's, Kuntscher has introduced pulp cavity file bone technology, makes intramedullary pin can be suitable for the pulp cavity of key portion more accurately, thereby has improved fixing." bayonet lock device " notion of Kuntscher is the pioneer of internal lock notion in modern age, has enlarged the indication of intramedullary pin art.Early 1980s, marrow internal fixation such as Ender nail, Lottes nail have been widely used in various long bone shaft fractures.Along with becoming better and approaching perfection day by day of lock-in techniques, the strong internal fixation that intramedullary pin had, stress shielding is little, resets away from fracture end, must be in demonstrating fully for destroying little characteristics to fracture end blood.Now, intramedullary pin comprises intramedullary nail with lock, is the important method of treatment long bone fracture.

But along with the special disease that this know-why is applied to little child of age, as osteogenesis imperfecta, congenital pseudarthrosis of tibia etc., just the problem that rod cann't be solved in the above-mentioned marrow has appearred: because the particularity of these diseases, the interior rod of implanting in the long bone of marrow must remain in the long bone pulp cavity for a long time, to prevent angulation deformity and refracture; But because the cause that the child constantly grows; in the short period of time because whole bone length is elongated, the interior rod of marrow can shorten relatively and the interior excellent tail end of marrow can be gradually away from metaphysis; cause the interior excellent tail end distally of marrow sclerotin to lose the protective effect of rod in the marrow; can engender local deformation, angulation deformity, the last fracture that excellent tail end intersection in the marrow inevitably takes place.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of simple in structure, implantation and simple installation, fixing reliable, effectively fixedly long bone again can be with the extensible marrow inner fixing device of bone growth.

For solving the problems of the technologies described above, the technical scheme that the utility model proposes is:

A kind of extensible marrow inner fixing device comprises rod in the marrow and excellent two ends in the marrow can be fixed in locking piece in the bone that rod comprises sleeve and inner core in the described marrow, and described inner core one end slidably is sheathed in the described telescopic cavity.

As to further improvement of the utility model, the far-end of described sleeve and inner core respectively is provided with a lockhole that laterally runs through, and described locking piece is arranged in the described lockhole.

Described lockhole is a screwed hole, and described locking piece is the locking bolt of hollow, and the outer wall of locking bolt is provided with the screw thread that cooperates with described screwed hole.

Compared with prior art, the utlity model has following beneficial effect:

The marrow inner fixing device that prolongs of the present utility model, it is simple in structure, and is easy to manufacture.By rod in the marrow is made into the telescopic structure; and its two ends are fixed in the epiphysis; make its effectively fixedly long bone, effectively prevent the generation of long bone fracture and keep the long bone form; again can be along with skeletal growth reaches the purpose that prolongs gradually; especially be fit to be applied to the especial patient of child's orthopaedics, lower limb long bone deformity and fracture as osteogenesis imperfecta reach postoperative protection etc. in the art of congenital pseudarthrosis of tibia; has implantation and quick and easy for installation, the reliable advantage of fixed effect.

Description of drawings

Fig. 1 is that this utility model is installed on the structural representation in the bone;

Fig. 2 is the structural representation that this utility model automatically prolongs with bone growth.

Marginal data:

1, sleeve; 2, inner core; 3, lockhole; 4, locking bolt.

The specific embodiment

Below in conjunction with specific embodiment and accompanying drawing this utility model is further described.

As shown in Figure 1, extensible marrow inner fixing device of the present utility model, comprise rod in the marrow and excellent two ends in the marrow can be fixed in locking piece in the bone, rod is a Collapsible structure in the marrow, it comprises sleeve 1 and inner core 2, sleeve 1 one ends have the bottom of sealing, and inner core 2 one ends slidably are sheathed in the cavity of sleeve 1.Lap between sleeve 1 and the inner core 2 should have long enough, is advisable so that skeleton is unlikely to make after growing up to fully inner core 2 to drop in the sleeve 1, in order to avoid cause the new angulation deformity of skeleton.In rod is fixed in the telescopic device introducing marrow, locking piece is installed in the epiphysis, make it rod in marrow can be fixed in the long bone total length, effectively prevent the generation of long bone fracture and keep the long bone form, can allow the interior rod of marrow elongated automatically again along with the increase of bone length, and pass through the metal bar of epiphyseal plate because invariant position so epiphyseal plate bone bridge can not take place yet, is particularly useful for the patient of child's orthopaedics.It has simple in structure, implantation and easy, the reliable advantage of fixed effect quick for installation.

In the present embodiment, the far-end of sleeve 1 and inner core 2 respectively is provided with a lockhole that laterally runs through 3, and this lockhole 3 is preferably screwed hole, and locking piece is the locking bolt 4 of hollow, and the outer wall of locking bolt 4 is provided with the screw thread that cooperates with screwed hole.Locking bolt 4 is preferably the structure of hollow, be convenient in practical operation earlier to pass the lockhole 3 at excellent two ends in the marrow as guide pin, introduce then and lock bolt 4, will lock bolt 4 and be arranged in the lockhole 3 with thin Kirschner wire, by being threaded, so that excellent two ends in the marrow are locked in the epiphysis.The material of sleeve 1, inner core 2 and locking bolt 4 can be rustless steel, aluminium alloy etc.

Fig. 1 and Fig. 2 are extensible marrow inner fixing device of the present utility model and are fixed on the interior enforcement illustration of child's tibia.Behind definite long bone pulp cavity diameter, can determine the diameter of sleeve 1 and Inner core 2; Sleeve 1 is placing distal tibial, along with skeleton is elongated, can see obviously that the length that the less Inner core 2 of diameter is exposed to outside the sleeve 1 among Fig. 2 is elongated gradually, has promptly reached the purpose that automatically prolongs.

The above only is a preferred implementation of the present utility model, and protection domain of the present utility model also not only is confined to the foregoing description, and all technical schemes that belongs under this utility model thinking all belong to protection domain of the present utility model.Should be pointed out that for those skilled in the art, also should be considered as protection domain of the present utility model in the some improvements and modifications that do not break away under this utility model principle prerequisite.

Claims

1. extensible marrow inner fixing device, comprise rod in the marrow and excellent two ends in the marrow can be fixed in locking piece in the bone, it is characterized in that: rod comprises sleeve (1) and inner core (2) in the described marrow, and described inner core (2) one ends slidably are sheathed in the cavity of described sleeve (1).

2. extensible marrow inner fixing device according to claim 1 is characterized in that: the far-end of described sleeve (1) and inner core (2) respectively is provided with a lockhole that laterally runs through (3), and described locking piece is arranged in the described lockhole (3).

3. extensible marrow inner fixing device according to claim 2 is characterized in that: described lockhole (3) is a screwed hole, and described locking piece is the locking bolt (4) of hollow, and the outer wall of locking bolt (4) is provided with the screw thread that cooperates with described screwed hole.