CN2281769Y

CN2281769Y - Removing device for internal fixing remained screw in human fracture

Info

Publication number: CN2281769Y
Application number: CN 97213490
Authority: CN
Inventors: 赵玉贵; 吴卫新; 张罗献; 洪云飞; 陈义君; 张胜利; 陈金华; 高建中
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-10
Filing date: 1997-04-10
Publication date: 1998-05-20
Anticipated expiration: 2007-04-10

Abstract

The utility model relates to an extractor for a remnant and fixed screw in a human fracture, which comprises a screwdriver assistor, a hollow drill, an extractor for a remnant screw in a bone and a perching knife. The utility model is characterized in that the extractor for a remnant screw in a bone is composed of a handle, an assisting rod, tightening screw nuts, a sleeve pipe and an elastic collet. The utility model which is especially suitable for extracting the remnant screw deep in the bone has the characteristics of reasonable structural design, easy fabrication and small structural size. The utility model which is convenient to move, carry and use solves the long-term difficulty that a steel plate and the screw which are remained in bone of a human body are difficult to be extracted out in an orthopaedics operation.

Description

The withdrawing device of the residual screw of human fracture's internal fixation

The utility model relates to the withdrawing device of the residual screw of a kind of human fracture's internal fixation, specifically, the utility model relates to residual nail extractor in the bone described in the withdrawing device of the residual screw of human fracture's internal fixation.

Adopt steel plate internal fixation treatment long bone fracture, carry out existing over half a century so far at home, over particularly after liberation past two, 30 years, this operation obtains extensively to carry out in basic unit, plays a part very positive undoubtedly to the rehabilitation of fracture patient.But need after the union of fracture steel plate and screw are retrieved, this brings certain trouble just for the clinical orthopaedics doctor, and through examining, it is that taking-up difficulty or screw take out not thorough that many situations are arranged from domestic various places; To the fixing patient who surpasses more than 8 months of those steel plates, sometimes for avoid steel plate get to come out or the residual bone of screw in, advise patient's no longer taking-up forever more.But the leaving over of steel plate often makes the patient part that pain, acid are arranged, discomfort such as is stranded, and influences the work life.

The purpose of this utility model is to provide a kind of withdrawing device that has overcome the residual screw of above-mentioned insufficient human fracture's internal fixation, and specifically, this utility model provides a kind of interior residual nail extractor of bone that has overcome above-mentioned shortcoming.

The purpose of this utility model realizes like this:

In the withdrawing device of the residual screw of human fracture's internal fixation described in the utility model, adopted residual nail extractor in the bone of forming by handle, collet and deflation nut with new structure.

The withdrawing device of the residual screw of human fracture's internal fixation described in the utility model comprises residual nail extractor, perching knife in screwdriver assistor, core drill, the bone, wherein:

1, screwdriver assistor can be divided into the screwdriver assistor of single handle or two handles, and it is made up of dop and force application handle, single handle assistor has a handle, and the double-handle assistor has two handles, and dop is hollow tubular, jagged, can be enclosed within on the screwdriver rod, breach blocks the projection on the screwdriver rod.

2, core drill can be divided into handle type core drill or dynamical type core drill: usually, the about 8.5-9mm of the drill pipe diameter of core drill, front end have brill tooth (end tooth), lateral row's thing hole, rear end, and the handle type core drill is a power with doctor's proficiency twisting handle.The supporting use of joining of dynamical type core drill and electric drill or bitbrace.

Its operation principle is that the hole for nailing of core drill along residual nail in the bone pierced into.The bone bits are discharged by row's thing hole.

3, the specific descriptions of residual nail extractor are as follows in the bone described in the utility model:

(1) in the described bone making material of residual nail extractor normally, collet adopts spring steel, and it is carried out modified heat treatment; Tighten nut and handle and adopt common iron (No. 35 or No. 40), chrome-faced.

(2) structural behaviour: collet is used for the residual screw of clamping; When the deflation nut screws, can make collet produce 303 kilograms of clamping forces, produce 0.06 kilogram of M torsion.Residual nail is transferred in the rotation of hand-held handle inhour.

(3) operation principle of residual nail extractor is that elongated extractor is used to get the residual nail of dialling the deep in the described bone, tightening nut moves to the handle end rotation, collet unclamps, tightening nut moves to the chuck end rotation, collet shrinks, clamp residual nail, handle is rotated counterclockwise, and can transfer to residual nail.

4, perching knife is used to root out the cap nut that skids.

Above-mentioned minute screwdriver assistor, core drill, the interior residual nail extractor of bone, perching knife have constituted the withdrawing device of the residual screw of human fracture's internal fixation described in the utility model.

Be description of drawings of the present utility model below, can more be expressly understood this utility model by description of drawings and in conjunction with the following description book, specific as follows:

Fig. 1 is the structure diagram of residual nail extractor in the bone in the withdrawing device of the residual screw of human fracture's internal fixation described in the utility model.

Below in conjunction with accompanying drawing this utility model is described in detail, wherein:

The 1st, handle, the 2nd, boosting-rod, the 3rd, tighten nut, the 4th, hub, the 5th, sleeve pipe, the 6th, collet, the 7th, collet bar.

The withdrawing device of the residual screw of human fracture's internal fixation described in the utility model, by the screwdriver assistor, core drill, residual nail withdrawing device is formed in the bone, wherein, residual nail extractor is by handle 1 in the bone, collet 6, collet bar 7, tighten nut 3 and boosting-rod 2, hub 4, sleeve pipe 5 constitutes, and wherein, the top of bar 7 is thread segment, the hypomere of bar 7 is provided with collet 6, for being threaded, hub 4 is an integral piece with sleeve pipe 5 between bar 7 and the palm handle 1, between hub 4 and the bar 7 for being threaded, the inner conical surface of sleeve pipe 5 bottoms matches with the male cone (strobilus masculinus) of collet 6, and the both sides of hub 4 are provided with boosting-rod 2.

The lobe number of the collet of residual nail extractor can be two lobe formulas in the bone described in the utility model, also can be three-clove style.When sleeve pipe 5 when the head of collet 6 moves, the male cone (strobilus masculinus) of the inner conical surface of sleeve pipe hypomere compressing collet shrinks chuck, clamps residual screw, when sleeve pipe 5 when move at the rear portion, chuck 6 unclamps, and residual nail is got loose.

This residual nail extractor, sleeve pipe 5 is carefully grown with collet 6, is used to get the residual screw that pulls out the sclerotin deep.

The interior fixedly withdrawing device of residual screw of human fracture described in the utility model is that the advantage of residual nail extractor is as follows in the described bone specifically:

1, adopts this withdrawing device, make for many years to exist in the bone in the bone surgery Residual nail be difficult to get pull out because seldom having arrived solution, thereby removed steel plate or spiral shell Silk nail remains in the bone to the patient and brings pain, acid, the sense of discomfort such as is stranded.

2, this withdrawing device, reasonable in design, easily manufacturing, physical dimension Little, move, carry, use all very convenient.

Claims

1, the withdrawing device of the residual screw of a kind of human fracture's internal fixation, described withdrawing device comprises the screwdriver assistor, core drill, residual nail withdrawing device in the bone, perching knife, it is characterized in that residual nail extractor is by collet bar 7 in the described bone, tighten nut 3 and boosting-rod 2, hub 4, sleeve pipe 5 constitutes, wherein, the top of bar 7 is thread segment, the hypomere of bar 7 is provided with collet 6, between bar 7 and the palm handle 1 for being threaded, hub 4 is an integral piece with sleeve pipe 5, for being threaded, the inner conical surface of sleeve pipe 5 bottoms matches with the male cone (strobilus masculinus) of collet 6 between hub 4 and the bar 7, and the both sides of hub 4 are provided with boosting-rod 2.