Intramedullary Nail Proximal Distal Locking Anti-Backout
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Solution Overview
Problem
Traditional intramedullary nail implantation systems face issues such as implant failure, difficulty in alignment of fixation screws, fragment rotation during implantation, and susceptibility to backout, which can lead to complications like cutout, cephalad cutout, proximal fragment rotation, and nonunion in bone fractures.
Innovation Solution
The development of intramedullary nails with proximal and distal locking mechanisms, interlocking fixation devices, and a ratchet system on the insertion tool to prevent backout, along with guide wires for anti-rotation, addresses these issues by providing enhanced stability and secure fixation within the bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional intramedullary nail implantation is used, then the procedure is simple, but implant failure and difficulty in alignment of fixation screws occur
Solution Approach 1:
The intramedullary nail is divided into multiple functional segments: a proximal locking mechanism with converging screws for proximal fragment stabilization, a distal locking mechanism with diverging screws for distal fragment stabilization, and an intermediate shaft portion. This segmentation allows each segment to perform its specific function optimally, improving overall implant reliability without requiring the entire nail to be overly complex.
Solution Approach 2:
The patent combines multiple fixation functions into a single integrated intramedullary nail device. The proximal and distal locking mechanisms, guide wires, and fixation screws are all integrated into one implant system, allowing simultaneous achievement of proximal stabilization, distal stabilization, and anti-rotation control through a unified device rather than separate components.
2Manufacturing precision
If traditional fixation methods are used, then the implantation process is quick, but alignment of fixation screws with the intramedullary nail is difficult
Solution Approach 1:
The intramedullary nail is pre-configured with precisely positioned openings and channels at predetermined locations along its length. These pre-positioned features guide the insertion of fixation screws and guide wires, ensuring proper alignment is achieved automatically during implantation without requiring time-consuming manual adjustment or complex alignment procedures.
3Reliability
If traditional intramedullary nails are used, then the device is simple, but susceptibility to backout and fragment rotation occurs
Solution Approach 1:
The intramedullary nail incorporates preliminary anti-backout features in its design, including threaded distal and proximal ends that engage with corresponding threading in the bone, and locking mechanisms that prevent reverse movement. These features are built into the nail structure itself, providing inherent protection against backout and fragment rotation without requiring complex external locking devices.
4Reliability
If guide wires are used for anti-rotation, then rotation is prevented, but accidental release and backout can occur
Solution Approach 1:
The guide wire is nested within a protective guide sheath that extends along a significant portion of the guide wire's length. This nesting configuration provides mechanical protection for the guide wire, prevents accidental dislodgement, and allows the operator to control the guide wire through the sheath without direct manual manipulation of the exposed wire, thereby improving ease of operation while maintaining anti-rotation effectiveness.
Data Source
AI summary
Intramedullary nails, systems, and methods. The intramedullary nail may include a generally elongate body extending from a first, distal end to a second, proximal end. The distal end may include one or more openings configured to receive one or more bone anchors that extend transversely through the distal end intramedullary nail, and thereby configured to secure the distal end of the nail. The proximal end may also include one or more openings configured to receive one or more bone anchors that extend transversely through the proximal end of the intramedullary nail, and thereby configured to secure the proximal end of the nail. In some embodiments, the proximal opening may contain one or more relief cuts.