Mechanical Intramedullary Lengthening Distractor

Nail

1 -Technical Field

Shortening occurrence rate in the general public is 10%, up to 1 -1.5 cm shortening occurs - Shortening causes: limping .Scolisis . Osteoaritic changes in the hip joint and knee - So it bone lengthening for thease cases should be done . To lengthen bones osteotomy is done followed by distraction by an external fixator (Ilizarov) or internal fixation either dy dynamic intramedullary Nail (spin method) or magnetic nail ( by remote control). My invention intramedullary Nail by dynamic tensile pulling, which is characterized by several features: A minimum soft tissue injury and the financial cost of greatly reduced .

BackgroundAr distraction after can be doe either by : Limb Lengthening Options Methods

□ External Fixation (ex-fix):

□ Ilizarov -Smith and Nephew.

□ Taylor Spatial Frame (TSF) -Smith and Nephew.

□Most orthopedic companies market circular ex- fix frame.

Advantages :

1- Easy to apply .

2- Distraction & reduction under control .

3- Easy to remove & repair.

4- Decreased cost . i Disadvandages : - Infection in 100 % of cases .

- Poor compliance .

3-Allighnment problems.

□□ Hybrid Technique.

□External & Internal devices used in combination.

1- Easy to apply .

2- Distraction & reduction under control .

3- Easy to remove & repair.

4- Decreased cost .

Disadvandages :

1 - Infection in 100 % of cases .

2- Poor compliance .

□ Dlntramedullay Nails.

Advantages :

- Nearly no infection.

- Very good compliance .

3-No allighnment problems.

Disadvantages :

1- Hard to apply .

2- Distraction & reduction not under control .

3 - Hard to remove & repair.

4- Very expensive .

□ISKD Nail -OrthoFix(Recalled but may be re-released in select countries). Mechanical problems.

□FitBoneNail-WittensteinGroup (CE Mark only & Compassionate Use). Mechanical problems.

□ GuichetNail-JM GuichetClinic (1 Location in France). Mechanical problems.

□ PRECICE Nail -Ellipse Technologies Inc. (FDA and CE Mark).

Very expensive ; some mechanical and magnetic field problems.

2- Disclosure Of Invention :

Telescopic Nail composed of : a-Outer Cylinder !O mm in dimeter . ( Fig.l )

b-Inner cylinder 6 mm in diameter with saw teeth cuts . ( Fig.1 ) c - Locking mechanism for the saw teeth . ( Fig.1 )

d- Locking screws oriffeces . ( Fig.1 ) l - Brief description of the drawings

Fig.l

1 - Application entery .

2- Outer cylender.

3 - Locking mechanism.

4- Inner cylender.

Fig.2 & 3 & 4

Mechanical Intramedullary Lengthening

Distractor Nail Traction device .

Fig.6

Nail componants.