CN2234252Y

CN2234252Y - Sleeve type external fixator for bone

Info

Publication number: CN2234252Y
Application number: CN 95213196
Authority: CN
Inventors: 刘丹; 李泽华
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-06-04
Filing date: 1995-06-04
Publication date: 1996-09-04
Anticipated expiration: 2005-06-04

Abstract

The utility model discloses a sleeve type external fixator for bones, composed of a connecting rod, a fixing seat, a connecting block, a needle fixing body, and a steel needle, wherein, the connecting rod is composed of a fixing bar and a sleeve pipe; the sleeve pipe can slide, anti-rotate, and lock on the fixing bar; an elastic body is arranged on the connecting rod; limited and elastic slide can be generated when the connecting rod is stressed and compressed. The needle fixing body and the connecting block are connected with the connecting rod through the fixing seat, a universal joint is formed, and can be mutually locked; the needle fixing body can far and near extend and shrink on the connecting block for fixing the steel needle. The utility model has the advantage of convenient operation, and is a kind of elastic fixing.

Description

Bushing type bone external fixator

The utility model proposes a kind of bushing type bone external fixator, belong to orthopedic medical device.

The bone external fixator is of a great variety, different at present.But form by connecting rod, holder, solid needle body and several parts of draw point basically.Connecting rod is generally threaded rod, polished rod or positive and negative threaded sleeve.Gu needle body fixedly is connected with connecting rod, fixes by holder behind the draw point.Draw point also can be directly fixed on holder.Their shortcoming is: (1) solid needle body can only be on distance connecting rod one fixed range fixing draw point, thereby limited the draw point position, inserting needle need use sight, external fixer is installed inconvenient.(2) structure is stiff, can not carry out flexible fastening.More popular at present one-sided longitudinal axis power bone external fixator (Chinese surgical magazine 1990; 6:346), its solid needle body directly links to each other with connecting rod with ball-and-socket joint, and is flexibly movable.But draw point is essential parallel in its solid needle body, and the phase mutual edge distance has certain limitation, and inserting needle still needs sight.But power pressurization is carried out in its connecting rod longitudinal sliding motion, but for pulverize, fracture such as oblique, spiral type is for preventing that limb shortening from can not carry out power in early days and pressurizeing to promote union of fracture better.

Task of the present utility model is to propose a kind of bushing type bone external fixator, and its inserting needle position, direction are unrestricted, and be without sight, easy for installation.Its fixedly character be flexible fastening.

For solving above-mentioned task, the solution that this utility model adopts is: connecting rod is made up of hold-down bars and sleeve pipe.Sleeve pipe be provided with feather key and locking screw cooperate with slide rail on the hold-down bars make sleeve pipe can slippage on hold-down bars, anti-ly revolve and lock.Establish elastomer on the connecting rod and make connecting rod when axially loaded compresses, sleeve pipe is stopped by elastomer, produces limited, elastic slip.Gu needle body links to each other with holder by contiguous block, Gu needle body is can be on contiguous block far and near flexible and along 360 ° of self longitudinal axis rotations; Contiguous block can paste the 360 ° of rotations in holder interface; Holder can be along connecting rod slippage and 360 ° of rotations; Gu the needle body head has an open slot, fix with the head nut screwing clamping after snapping in draw point.

This utility model is established elastomer on connecting rod, make its can to pulverize, fracture such as oblique, spiral type carries out early stage power pressurization promotion union of fracture and do not have the worry of limb shortening.Owing to add a contiguous block between solid needle body of this utility model and holder, and needle body can stretch on contiguous block, rotate admittedly, Gu needle body head opening.So this external fixer is installed and not limited by draw point position, direction, inserting needle arbitrarily is without sight.And it is parallel with the limbs axis to adjust connecting rod, more gives full play to the power pressurization.

Below in conjunction with drawings and Examples this utility model is described further:

Connecting rod is made up of hold-down bars (4) and sleeve pipe (6), the sleeve pipe medial extremity is established feather key and locking screw (7) and hold-down bars (4) and is gone up slide rail and match and make sleeve pipe (6) go up slippage and prevent rotation at hold-down bars (4), tightens locking screw (7) and then makes sleeve pipe (6) locking.Hold-down bars (4) has screw thread in sleeve pipe (6) side, and rotation adjusting nut (5) (12) can make connecting rod prolong and compression.Add an elastomer (15) between sleeve pipe (6) and adjusting nut (5), its range is 1.0mm, and maximum pressure is 8kg.When the connecting rod axially loaded compressed, sleeve pipe (6) was stopped by elastomer (15) and produces the finite elasticity slippage.This elastomer (15) is an elastic washer; Can certainly adopt spring, reed or rubber elastomer.Holder is made up of interior fastener (10) and overcoat (11).Interior fastener (10) is the Cylinder shape, and screw thread is arranged at the top, and holder nut (9) is arranged on the screw thread.Overcoat (11) is the garden tubular, and there is a perforation on the top, other end opening.When overcoat (11) was inserted in interior fastener (10), screw thread passed from perforation.Interior fastener (10) all has straight through identical cross through hole with hold-down bars (4) or sleeve pipe (6) with overcoat (11) body.Connecting rod penetrates through hole, and holder can be along the connecting rod slippage with around 360 ° of rotations of connecting rod.Design makes interior fastener (10) and overcoat (11) top that one gap be arranged, and when being tightened a nut (9), holder and connecting rod can be fixed by the effect that lifts interior fastener (10) and extruding overcoat (11).Gu needle body (2) is made up of garden column head and afterbody, and screw thread is all arranged, head has open slot, snaps in draw point (13), tightens fixedly draw point (13) of head nut (1).Contiguous block (8) is that an end is the cuboid of garden arcuation, cross one another 2 through holes have living space, a through hole is inserted in interior fastener (10) screw thread, make contiguous block (8) can paste the 360 ° of rotations in holder interface, tightening holder nut (9) can be fixing with connecting rod, holder and contiguous block (8) simultaneously.Another through hole is inserted in solid needle body (2) afterbody, and solid pin (2) can be along 360 ° of self longitudinal axis rotations, and it is far and near flexible and fixing that solid needle body (2) the afterbody nut (3) of rotation can make solid needle body (2) go up at contiguous block (8).In case of necessity, draw point (13) also can directly penetrate solid needle body (2) the afterbody through hole on the contiguous block (8), and is fixing with the trip bolt (14) of its side.Contiguous block (8) can be forms such as device of shifting block type, clamping plate type or elasticity folder.This utility model material can adopt metal or highstrenghtpiston.

Claims

1, a kind of bushing type bone external fixator, its member has connecting rod, holder, Gu needle body (2), contiguous block (8) and draw point (13), connecting rod is made up of hold-down bars (4) and sleeve pipe (6), sleeve pipe is provided with feather key and locking screw (7) and cooperates with slide rail on the hold-down bars (4) and make sleeve pipe (6) go up slippage at hold-down bars (4), prevent revolving and locking, holder is made up of interior fastener (10) and overcoat (11), interior fastener (10) top has a screw thread to pass from overcoat (11) overp0unch, holder nut (9) is arranged on the screw thread, interior fastener (10) and overcoat (11) all have a cross through hole to be inserted in hold-down bars (4) or sleeve pipe (6), and can slippage on connecting rod, rotate 360 °, Gu needle body (2) is made up of head and afterbody, screw thread is all arranged, two cross one another through holes in space are arranged on the contiguous block (8), one is threaded with interior fastener (10) and makes contiguous block (8) can paste 360 ° of holder interface rotations, tightening holder nut (9) can be simultaneously with connecting rod, holder and contiguous block (8) are fixing, another through hole has solid needle body (2) afterbody to feed, Gu needle body (2) can rotate 360 ° along self longitudinal axis, there is a trip bolt (14) solid needle body (2) afterbody through hole side on the contiguous block (8), in case of necessity, draw point (13) can directly penetrate this through hole, fixing with trip bolt (14), it is characterized in that: regulate solid needle body (2) afterbody nut (3) and can make solid needle body (2) upward far and near flexible and fixing at contiguous block (8), Gu needle body (2) head has an open slot, draw point (13) snaps in the back and tightens fixing with head nut (1); Hold-down bars has screw thread on (4), and rotation adjusting nut (5) (12) can prolong and compress connecting rod; Connecting rod is provided with elastomer (15) makes connecting rod when axially loaded compresses, and sleeve pipe (6) is stopped by elastomer (15), produces limited, elastic slip.

2, bushing type bone external fixator according to claim 1 is characterized in that: interior fastener (10) is the Cylinder shape, and overcoat (11) is the cover tubular.

3, bushing type bone external fixator according to claim 1 is characterized in that: contiguous block (8) can be forms such as device of shifting block type, clamping plate type or elasticity folder.

4, bushing type bone external fixator according to claim 1 is characterized in that: elastomer (15) can be spring, reed, elastic washer and rubber elastomer.

5, bushing type bone external fixator according to claim 1, it is characterized in that: the external fixator material can adopt metal or highstrenghtpiston.