CN2247008Y

CN2247008Y - Telescopic self-lock pressure inner marrow needle

Info

Publication number: CN2247008Y
Application number: CN 95250288
Authority: CN
Inventors: 段西峰; 王维
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-30
Filing date: 1995-12-30
Publication date: 1997-02-12
Anticipated expiration: 2005-12-30

Abstract

The utility model relates to a telescopic self-locking pressurizing needle in used in marrow, which is composed of a pressurizing rod and a self-locking sleeve pipe arranged on the lower part of the pressurizing rod. The utility model has the advantages of simple structure, convenient operation and use, pulling resistance, folding resistance and strong rotary force resistance. Because the lower part of the self-locking sleeve pipe is provided with a self-locking head in a triquetrous cone shape, and the self-locking head is composed of a solid trilobate lobe, the fixation is firm. Because the length of the needle can be conveniently adjusted, a few part of the needle is revealed out of the cortex after operation. The functional exercise is convenient after the operation. The utility model is not only suitable for the fracture of the middle upper sections of the femoral bone and the shoulder bone, but also suitable for the fracture of the middle lower section of the femoral bone.

Description

Retractable self-locking pressurization intramedullary needle

This utility model relates to a kind of bone fracture internal fixing device, particularly a kind of retractable self-locking pressurization intramedullary needle.

Normally used fracture internal fixation intramedullary needle mostly is traditional blossom type and V-type intramedullary needle, and not only warping resistance power is relatively poor for such needle set, and function is comparatively single, owing to can not add press fit, so postoperative needs to carry out external fixation with Gypsum Fibrosum.The utility model patent communique once disclosed a kind of name, and to be called " adjustable screw-in expand pressurization inner fixer " notification number be the patent of CN2127600N, and it is provided with the expansion tube of expansion blade by far-end and is positioned at that expansion tube has the screw rod of expansion-head and the pressurizing nut of expansion tube near-end is formed.Owing to need when using with after the vertical boring of fracture end, together insert expansion tube and interior screw rod thereof in the pulp cavity, pass through rotary screw, make it to move down, four fens blade distendings with the expansion tube lower end, make it to be adjacent to the medullary cavity inwall, and the far-end of fracture and near-end are closed up by the pressurizing nut of proximal screw end, realize the fixed purpose of pressurization, so it is complicated operation not only, and because present China does not also have this type of long orthopaedics with boring, so this holder only can be used for the fracture at shorter position.Because the expansion tube lower end is four circular lobulateds,,, make it be difficult to the fixation of pressurizeing again owing to be spongy bone in the medullary cavity though there is far-end Corallium Japonicum Kishinouye face anti-skidding.When this holder was used for the less position of medullary cavity, owing to can't too much screw in screw rod, it is more that its screw rod is exposed, and needs to adopt when operation the reinforcing bar pincers of big specification to cut off, and makes operation inconvenience to some extent in sterilization before the art, the art, takes out difficulty after the union of fracture.And when pressurization, realize by upwards lifting whole holder, also cause whole holder exposed parts longer, but can't wipe out, take exercise thereby influenced the postoperative appropriate functional.

The purpose of this utility model is to provide a kind of retractable self-locking pressurization intramedullary needle, and it is tension, anti-folding, strong, the fixation of anti-rotational force not only, and simple in structure, easy to operate, postoperative can in time carry out functional exercise.

Its concrete solution is: be provided with a self-locking sleeve pipe that is sleeved on the pressure rod in the bottom of pressure rod, self-locking sleeve pipe top is provided with female thread, be used for being connected with pressure rod, all the other positions are three lobulateds, and the telescopic bottom of self-locking is one to constitute the self-locking head that is the rhizoma sparganic taper by solid SANYE lobe.The sidewall of pressure rod topmost is provided with an anti-projection that embeds, and upper portion side wall is provided with the axial decompression groove, and the bottom is provided with telescopic joint and adjust the screw thread that this intramedullary needle uses length with self-locking, and the bottom is a conical head.

During use, undertaken, after the reduction of the fracture, make the self-locking sleeve pipe be positioned at the far-end of fracture, and self-locking head far-end three leaflets and solid rhizoma sparganic lobe are strutted, realize the fixed purpose of pressurization by the rotation pressure rod by the operation of general intramedullary needle.

This utility model only is made of pressure rod and self-locking head two parts, it is easy to use, tension, anti-folding, anti-rotational force are stronger, because self-locking sleeve pipe bottom is a self-locking head that is the rhizoma sparganic taper that is made of solid SANYE lobe, thus fixing comparatively firm, again owing to can adjust the length of this pin easily, it is outer less to make this pin of its postoperative expose cortical bone, help postoperative function and take exercise, it is not only applicable to epimere fracture in femur and the humerus, also is specially adapted to distal fracture of femur.

In conjunction with the accompanying drawings this utility model is described in detail below by embodiment:

Fig. 1 is the structural representation under this utility model duty.

Fig. 2 is this utility model self-locking sleeve structure sketch map.

Fig. 3 is the A-A profile of Fig. 2.

Fig. 4 is this utility model pressure rod structural representation.

In the present embodiment, the topmost sidewall of pressure rod (2) is provided with the anti-projection (1) that embeds, and pressure rod (2) top is provided with two axial relief grooves (3), and the lower thread of pressure rod (2) is connected with a self-locking sleeve pipe (4), and the pressure rod bottom is conical head (6).Self-locking sleeve pipe (4) except that topmost is provided be used for female thread that pressure rod is connected, all the other positions all are cut into three leaflet flaps, and the bottom is one to constitute the self-locking head (5) that is the rhizoma sparganic taper by solid SANYE lobe.

During clinical operation, select the intramedullary needle suitable for use with pulp cavity, connect after the operation of normal intramedullary needle squeezes into, in fracture near-end insertion pulp cavity, the afterbody of pressure rod is passed from fracture end, after afterbody is inserted in self-locking sleeve pipe (4), the self-locking sleeve pipe is drawn in the fracture near-end, from the fracture near-end pressure rod is squeezed into the fracture far-end together with self-locking sleeve pipe (4) after making the reduction of the fracture, beat till the extremely anti-embedding high spot, utilize box spanner rotation pressure rod (2) to make the rhizoma sparganic taper self-locking head on the self-locking sleeve pipe strut impaction fracture distal bone pulp cavity inwall and self-locking, be further rotated pressure rod, the mutual embedding of two fracture ends is pressed, firmly add press fit, and fracture near-end cortical bone is only stayed the long pressure rod of anti-embedding projection top 1.5cm, and postoperative does not need external plaster fixation.After the union of fracture, can cut an osculum at proximal bone earlier, separate a little, box spanner is sleeved on the pressure rod on the anti-embedding projection of bar top, the opposite spin pressure rod, after the SANYE lobe of self-locking head was closed up, extractor was together pulled out pressure rod and self-locking sleeve pipe and externally just can on the card of pressure rod top.

Claims

1, a kind of retractable self-locking pressurization intramedullary needle, constitute by pressure rod (2) and self-locking sleeve pipe (4), it is characterized in that self-locking sleeve pipe (4) is sleeved on the bottom of pressure rod (2), self-locking sleeve pipe (4) top is provided with the female thread that is connected with pressure rod, all the other positions are three leaflet flaps, self-locking sleeve pipe (4) bottom is self-locking head (5), the lateral wall of pressure rod (4) topmost is provided with the anti-projection (1) that embeds, upper portion side wall is provided with axial decompression groove (3), the bottom is provided with screw thread, and the bottom is a conical head (6).

2, scalable pressurization intramedullary needle according to claim 1 is characterized in that self-locking head (5) is one to constitute the self-locking head that is the rhizoma sparganic taper by solid SANYE lobe.