Bone Surgery Pressing Tool with Movable Spherical Head
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Solution Overview
Problem
Existing bone retainer tools struggle to apply a compression force in the longitudinal axis direction, making it difficult to achieve close contact between osteotomy surfaces during bone surgery.
Innovation Solution
A pressing tool with a columnar pressurizing member and a hook member that engages with the bone, allowing for compression in both the radial and longitudinal directions, utilizing a projection portion to bite into the bone and a movable pressing surface for precise force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a bone retainer is used to apply compression force, then the bone and bone joining member can be brought into close contact in the radial direction, but the osteotomy surfaces cannot be drawn together in the longitudinal axis direction
Solution Approach 1:
The pressing member is configured to apply compression force not only in the radial direction (perpendicular to bone surface) but also in the longitudinal axis direction (parallel to bone surface). This multi-directional force application resolves the contradiction by enabling both radial compression for bone-plate contact and longitudinal compression for osteotomy surface alignment simultaneously.
Solution Approach 2:
The pressing tool is divided into distinct functional components: a hook member for engaging the bone, a support portion for stable positioning, and a pressing member for force application. This segmentation allows each component to specialize in its function while working together to achieve both radial and longitudinal compression effects.
2Stability of the object's composition
If a bone retainer with fixed structure is used, then the bone can be held stable, but the compression force cannot be adjusted precisely
Solution Approach 1:
The pressing member is designed to be movable relative to the support portion, transforming the fixed structure into a dynamic system. This allows the compression force to be adjusted by moving the pressing member along the longitudinal axis while the hook member remains stably engaged with the bone, achieving both stability and adjustability.
Solution Approach 2:
The support portion acts as an intermediary between the stable hook member (engaged with bone) and the adjustable pressing member. This intermediary structure provides a stable base for force application while allowing the pressing member to move independently for force adjustment.
3Device complexity
If a simple pressing structure is used, then the device complexity is reduced, but the ability to apply compression in both radial and longitudinal directions is compromised
Solution Approach 1:
The hook member and support portion are merged into a single integrated component that performs multiple functions: bone engagement, stable positioning, and providing a reference frame for force application. This merging reduces the number of separate parts while maintaining the capability to apply compression in both radial and longitudinal directions.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A pressing tool (1) for bone surgery according to the present invention includes a pressing member (3) formed substantially columnar shape having, at one end, a pressing surface (3c) formed of a convex and substantially spherical surface; and a hook member (2) formed to have a hook shape that is to be engaged with a side surface of a bone, the hook member (2) having a support portion (5) at a first end, the support portion (5) supporting the pressing member (3) so that the pressing surface (3c) is directed toward a second end, and a projection portion (6) at the second end, the projection portion (6) projecting toward the supporting portion (5) and being to be bited into the side surface of the bone, wherein the support portion (5) supports the pressing member (3) so that the pressing member (3) is movable in a longitudinal direction toward the projection portion (6).