Bone Cement Injection Device with Segmented Needle Separation
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Solution Overview
Problem
Current bone cement injection devices face challenges in safely stopping injection and easily separating from bone cement when it leaks into blood vessels or hardens, leading to complications like paraplegia and spinal nerve damage due to the high hardening speed and viscosity of bone cement, which often results in bone cement remaining in the injection tube and tissue.
Innovation Solution
A bone cement injection device comprising an outer needle tube with a U-shaped main hand grip and an inner needle rod, featuring a fastening portion with a male screw for secure bone cement supply and a partially closed end portion to facilitate separation from hardened bone cement, allowing safe extraction without causing further tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bone cement is injected continuously to ensure complete filling, then injection efficiency is improved, but the risk of leakage into blood vessels and spinal canal increases
Solution Approach 1:
The device incorporates a pressure sensor that continuously monitors injection pressure and provides feedback to the control unit. When pressure exceeds a predetermined threshold indicating potential leakage, the system automatically stops injection, resolving the contradiction between continuous injection efficiency and leakage risk by enabling real-time monitoring and automatic intervention
Solution Approach 2:
The system performs self-monitoring and self-stopping through automated pressure detection and control. The injection device independently detects abnormal conditions and terminates injection without requiring external intervention, balancing productivity and safety through autonomous operation
2Object-affected harmful factors
If injection is stopped immediately when leakage is detected, then complication risks are reduced, but bone cement may remain in the outer needle tube causing removal difficulties
Solution Approach 1:
The device separates the inner needle rod from the outer needle tube, allowing the inner rod to be withdrawn first while leaving the outer tube in place. This segmentation enables the injection path to be cleared of hardened cement while the outer tube remains for controlled removal, resolving the contradiction between stopping injection to prevent complications and ensuring easy tube removal
Solution Approach 2:
The system performs preliminary withdrawal of the inner needle rod before removing the outer needle tube. This preliminary action clears the injection path of hardened bone cement, preventing it from blocking outer tube removal while maintaining safety by having already stopped injection upon detecting leakage
3Manufacturing precision
If high pressure is applied to ensure complete bone cement injection, then injection completeness is improved, but the risk of forcing hardened cement into tissue increases
Solution Approach 1:
The pressure sensor provides continuous feedback on injection pressure, allowing the system to maintain high pressure for complete injection while automatically detecting when pressure exceeds safe thresholds. This enables achieving injection completeness while preventing tissue damage through real-time pressure monitoring and automatic intervention
Solution Approach 2:
The system dynamically adjusts injection pressure parameters based on real-time feedback. Pressure can be increased to ensure complete injection when conditions are favorable, and automatically reduced or stopped when thresholds are exceeded, resolving the contradiction between injection completeness and tissue damage risk through parameter optimization
Data Source
AI summary
A bone cement injection device whereby bone cement is inserted through the skin and into bone, and can easily be separated during outflow of the bone cement into the blood vessels and spinal canal and curing. An outer insertion member has an outer needle tube having one end that is sharpened to be inserted through the skin and into bone and a partially closed part where the cross-sectional area of the internal space is reduced. A main hand grip is integrally formed on the other end of the outer needle tube and has a fastening part able to be fastened to a bone cement supply. An inner insertion member includes an inner needle rod for insertion into the other end part of the outer needle tube which opens through the main hand grip, and an auxiliary hand grip which is integrally formed on the inner needle rod.