Extensible intramedullary nail for replacement surgery of pediatric patients and using method of extensible intramedullary nail

Abstract

The invention provides an extensible intramedullary nail for replacement surgery of pediatric patients and a using method of the extensible intramedullary nail. The extensible intramedullary nail forreplacement surgery of pediatric patients comprises an extension section and a intramedullary nail, the extension section and the intramedullary nail are connected through a two-way adjusting structure, and the extension section and the intramedullary nail are designed to oppositely extend through the adjusting effect of the two-way adjusting structure. An adjusting screw rod with right-hand thread and left-hand thread is adopted to connect the intramedullary nail and the extension section into a whole, the prosthesis can be extended bidirectionally by directly adjusting the adjusting hole inthe rotating nut through a special instrument during extension, and therefore the purpose of extension of the prosthesis is achieved. According to the invention, the aperture phi of the adjusting holeis 5mm, and the incision is 10mm enough during an operation, so that the operation time is shortened, and the operation infection probability is reduced.

Description

technical field [0001] The invention belongs to class III implants of medical devices, and in particular relates to an extendable medullary needle used in pediatric patient replacement operations and a method for using the same. Background technique [0002] As the height of pediatric patients increases, the length of the prosthesis replaced by the initial surgery cannot meet the height requirements of pediatric patients, and the prosthesis needs to be extended to make the height of the two affected limbs of pediatric patients the same [0003] The existing extensible prosthesis adopts a one-way threaded rod, and the nut is directly pushed against the extension sleeve by rotating the nut to cause displacement, and then locked with two fixing screws. The distance between the nut and the mounting hole of the fixing screw is at least 4cm, so that When the prosthesis is extended during surgery, the minimum surgical incision is not less than 4cm. The larger the surgical incision,...

AI Technical Summary

Problems solved by technology

[0002] As the height of pediatric patients increases, the length of the prosthesis replaced by the initial surgery cannot meet the height requirements of pediatric patients, and the prosthesis needs to be extended to make the height of the two affected limbs of pediatric patients the same

[0003] The existing extensible prosthesis adopts a one-way threaded rod, and the nut is directly pushed against the extension sleeve by rotating the nut to cause displacement, and then locked with two fixing screws. The distance between the nut and the mounting hole of the fixing screw is at least 4cm, so that When the prosthesis is extended during surgery, the minimum surgical incision should not be less than 4cm. The larger the surgical incision, the higher the infection rate; the fixing screw is loosened first, and then tightened after the adjustment is completed, resulting in a longer operation time and increased surgical wind direction

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