Compression Screw With Integral Wire Element For Bone Fragment Alignment
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Solution Overview
Problem
Existing compression screws used for bone fractures lack ease of use and often require complex procedures involving pre-drilling and wire elements, leading to potential misalignment and increased risk of foreign body retention during bone fragment compression.
Innovation Solution
A compression screw with a wire element integrally connected via a predetermined breaking point, allowing for unified compression without the need for pre-drilling and enabling guided insertion and removal, reducing mechanical stress and foreign body formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a compression screw is used without a wire element, then the device complexity is reduced, but the guidance precision during screwing is deteriorated leading to misalignment risk
Solution Approach 1:
The wire element and compression screw are merged into a single integrated component through integral connection. The wire element serves dual purposes: guiding the compression screw during insertion and acting as a predetermined breaking point for controlled separation. This integration eliminates the need for separate guidance mechanisms while maintaining alignment precision.
2Manufacturing precision
If a cannulated compression screw with wire element is used, then the guidance precision is improved, but the device complexity and procedure complexity increase
Solution Approach 1:
Instead of using a cannulated structure with a separate wire element passed through, the invention merges the wire element directly into the compression screw body through integral connection. This eliminates the cannulated cavity requirement while maintaining the guidance function, thereby reducing structural complexity.
Solution Approach 2:
The wire element in the integrated design serves multiple functions simultaneously: it acts as a guide element during insertion, provides a predetermined breaking point for controlled separation, and enables the compression screw to be used without pre-drilling. This multi-functionality reduces the need for additional components.
3Manufacturing precision
If pre-drilling and separate wire element insertion are required, then the guidance precision is improved, but the productivity and ease of operation are reduced
Solution Approach 1:
The wire element is pre-integrated into the compression screw during manufacturing, eliminating the need for separate pre-drilling and wire insertion steps during surgery. The predetermined breaking point is also established in advance, allowing for controlled separation after compression is achieved.
Solution Approach 2:
The guidance function and compression function are combined into a single integrated component. The wire element and compression screw form one unified device that can be inserted directly without separate preparation steps, thereby improving surgical efficiency.
4Strength
If the compression screw is designed with different thread pitches for compression, then the compression function is improved, but the device complexity increases
Solution Approach 1:
Different sections of the compression screw shank are designed with different thread pitches to achieve compression at specific locations. The first area has a first thread with a first pitch, while the second area has a second thread with a second pitch, allowing controlled compression of bone fragments at different zones along the screw.
Data Source
Figure 1
Figure 2
Figure 3[A]~3[C]
AI summary
The compression screw (1) has a longitudinal extending aligned shank (2). The shank is divided into two parts. The first part (5) of the shank has a thread (7) and within the wider part (6) a second thread (8) is arranged. The threads have different upward gradients. At end of the screw, in screwing direction a wire element (10) is provided. The wire element is connected as a one-piece with the compression screw.