Sleeve Pin Assembly for Bone Fixation
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Solution Overview
Problem
Existing methods for fixing fractured bone pieces, such as those described in Korean Patent Laid-Open Publication No. 10-2015-0143130, face challenges in secure fixation and require complex processes for drilling and spacer insertion, leading to inefficient and inaccurate bone piece alignment.
Innovation Solution
A sleeve pin assembly comprising a pin with a detachable collet portion and a sleeve that allows for axial movement and easy separation, enabling accurate drilling and secure fixation of bone pieces with a cable connection for binding multiple pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is inserted into a bone piece for fixation, then the bone pieces can be fixed, but secure fixation cannot be achieved and additional complex processes are required
Solution Approach 1:
The patent combines the pin and sleeve into a unified assembly where the sleeve is detachably coupled to the pin. This merging allows the pin to provide internal fixation while the sleeve provides external support, achieving secure fixation without requiring separate spacer insertion or additional drilling holes. The combined assembly simplifies the overall fixation process while maintaining high reliability.
Solution Approach 2:
The sleeve is designed to surround and detachably couple to the pin, creating a nested structure. The pin fits within the sleeve's internal receiving space, allowing the smaller pin component to be housed within the larger sleeve component. This nesting arrangement enables compact storage and easy deployment of the fixation system.
2Reliability
If an external fixing pin is used to fasten to the bone cortex, then fixation can be achieved, but a separate drilling hole must be processed
Solution Approach 1:
The pin is designed with dual functionality: it serves as both an internal fixation device inserted through the bone and as a guide for the sleeve. The pin's presence eliminates the need for separate drilling holes for the sleeve, as the sleeve can be positioned and attached directly to the existing pin. This multi-functionality simplifies the surgical procedure while maintaining secure fixation.
3Manufacturing precision
If a pin is inserted for fixation, then bone pieces can be fixed, but accurate drilling is difficult without spacer insertion and removal
Solution Approach 1:
The pin is inserted first to establish the correct position and orientation before the sleeve is attached. This preliminary action of pin insertion creates a stable reference structure that guides subsequent sleeve positioning. By performing the pin insertion beforehand, the system eliminates the need for complex spacer insertion and removal procedures, saving time while maintaining drilling accuracy.
4Ease of operation
If a collet portion is detachably coupled to the pin, then easy separation is achieved, but the coupling structure becomes more complex
Solution Approach 1:
The collet portion acts as an intermediary component between the pin and the sleeve. It provides a detachable coupling mechanism that allows easy assembly and separation of the pin and sleeve while maintaining structural integrity during use. The collet's design with detachment grooves and gap slits enables simple operational interfaces despite the internal mechanical complexity.
Data Source
AI summary
A sleeve pin assembly for fixing a bone piece, and more particularly, a new structure of sleeve pin assembly for fixing a bone piece in which a pin for fixing a plurality of bone pieces that have occurred upon being fractured is coupled to a sleeve with a collet method is provided. The sleeve pin assembly for fixing a bone piece includes: a pin having a fixing portion; a collet portion detachably coupled to the pin; a fastening portion having one end connected to the collet portion and the other end that can be fastened to an electric drill; and a sleeve including an internal receiving space to receive the collet portion.