Slide fastener extractor for broken intramedullary nail

Abstract

The invention provides a slide fastener extractor for a broken intramedullary nail. The extractor comprises a first guide wire and a second guide wire, wherein a bulb or claw is arranged at one end of the first guide wire, and is used for hooking the end part of a broken intramedullary nail and / or the screw hole of the broken intramedullary nail; the second guide wire and the first guide wire are inserted into the broken intramedullary nail for increasing the friction between the first guide wire and the broken intramedullary nail and helping the bulb or claw be fixed on the broken intramedullary nail. The slide fastener extractor especially comprises two parts, namely the first guide wire and the second guide wire, wherein the end part of the first guide wire is of a claw structure or a bulb structure, and is used for extending into the intramedullary nail to hook the end part of the broken nail or clamp into the threaded hole of the broken nail; then, the second guide wire is inserted into the broken nail, and the first guide wire is tensioned by the second guide wire, so that the claw or bulb is steadily connected with the broken nail; and finally, the broken nail is drawn out by utilizing the first guide wire and the second guide wire.

Description

technical field [0001] The invention relates to the technical field of medical equipment, and more specifically, to a slider extractor for broken intramedullary nails. Background technique [0002] Intramedullary nail fixation has become the standard for the treatment of long bone diaphysis fractures, but when fracture nonunion occurs, it is not uncommon for intramedullary nails to break due to metal fatigue, stress shielding and other reasons. Removal of the broken nail and replacement of the intramedullary nail is a common approach in the treatment of femoral and tibial nonunion fractures. However, it is still a very difficult task to close and remove broken nails without incision. [0003] Orthopedic surgeons often encounter the phenomenon of slipping between the inner thread (nut) of the head of the intramedullary nail and the outer thread (screw) of the connecting rod of the extractor when performing the intramedullary nail removal operation. Especially for poor-quali...

AI Technical Summary

Problems solved by technology

Especially for poor-quality intramedullary nails or the inner thread of the head of the intramedullary nail that has slipped in the last operation, the outer thread of the connecting rod of the extractor has no effect at this time, causing the head of the intramedullary nail to be disconnected from the The connecting rod of the extractor cannot be tightly connected, and it is difficult to remove the intramedullary nail; the change of biomechanics, the corrosion effect of body fluid on the internal fixation, the cold welding phenomenon between the internal thread of the head of the intramedullary nail and the protective cap, etc. The internal thread of the inner nail head is prone to slipping

[0004] If the above situation is encountered, the previous method can be used to clamp the head of the intramedullary nail with a rongeur, but this operation is prone to slippage and damage to the mouth of the rongeur

In addition, it is also possible to remove the bone surrounding the head of the intramedullary nail, expose the side hole of the intramedullary nail, bind the steel wire in the side hole, further connect with the extractor, and finally take it out through the extractor, but this will cause iatrogenic injury

At the same time, due to the limited strength of the steel wire, it is difficult to effectively fix the intramedullary nail, resulting in slippage

Moreover, the simple binding of steel wires is likely to cause damage to medical staff and patients, forming a great hidden danger.

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