A modular extendable intramedullary nail system

By designing an external adjustment and micro-motion function for the modular extended intramedullary nail system, the problems of existing devices requiring secondary surgery and lacking physiological micro-motion have been solved, achieving non-invasive adjustment of the intramedullary nail and promoting fracture healing.

CN122163299APending Publication Date: 2026-06-09SHANGHAI SIXTH PEOPLES HOSPITAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI SIXTH PEOPLES HOSPITAL
Filing Date
2026-04-08
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing extendable intramedullary nail devices have an adjustment mechanism designed inside the body, requiring a second surgical procedure, which is complex and lacks physiological micro-motion function, making them unsuitable for the bone growth and fracture healing needs of children or adolescents.

Method used

The system employs a modular, extendable intramedullary nail system, including an extendable intramedullary nail, an adjustable support, and an adjustable aiming frame. The length of the intramedullary nail can be adjusted non-invasively via external adjustment, and the controllable axial micro-motion function is provided through the cooperation of the first and second springs. Combined with the design of multi-angle screw holes and guide grooves and guide protrusions, stability and precise nail locking are ensured.

Benefits of technology

It enables non-invasive postoperative adjustment of the length of the intramedullary nail, avoids secondary surgical trauma, has controllable axial micro-movement capability, promotes fracture healing, and improves surgical precision and safety.

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Abstract

This invention discloses a combined extendable intramedullary nail system, including an extendable intramedullary nail, an adjusting bracket, a connecting arm, and an adjustable aiming bracket. The extendable intramedullary nail includes a mother nail body and a daughter nail body slidably sleeved outside the mother nail body. The connecting arm has two detachably connected fixing rods at both ends, one at the proximal end of the mother nail body and the other at the adjusting bracket. The adjusting bracket includes a fixing rod, an adjusting sleeve rotatably located at the distal end of the fixing rod, and an adjusting assembly. The adjusting sleeve drives the adjusting assembly to move axially via a threaded connecting rod. The distal end of the adjusting assembly has a fourth screw hole matching the second screw hole at the distal end of the daughter nail body. The adjustable aiming bracket is located at the distal end of the adjusting assembly and has a fifth screw hole matching the second screw hole. A first spring is provided within the sliding cavity of the daughter nail body, and a second spring is provided within the adjusting assembly, which can be selectively locked or released to achieve axial micro-movement. This invention enables non-invasive external adjustment of the intramedullary nail length, has controllable axial micro-movement function, precise distal locking, and convenient operation.
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