Multi-plane Cortical Bone Screw with Ball Head Conical Rotation
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Solution Overview
Problem
Traditional cortical bone screws lack flexibility after initial implantation, limiting their adaptability to the shape of the human bone and restricting further adjustment of the rotation angle, which can lead to blocked operations and reduced minimally invasive capabilities.
Innovation Solution
A multi-plane cortical bone screw design featuring a ball screw connected to a screw tail with a chucking appliance, allowing for rotational adjustment along a conical surface, and an inclined bottom plate that enables larger angle adjustments without altering the screw's external shape, facilitating multi-plane and multi-angle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cortical bone screw structure is changed to increase flexibility, then the adaptability to bone shape improves, but the external shape may be altered or operation blocked
Solution Approach 1:
The screw is divided into functionally independent segments: the screw tail with U-shaped notches for connection rod attachment, and the ball screw mechanism for angle adjustment. This segmentation allows the ball screw to rotate independently within the screw tail, providing flexibility without interfering with the connection rod clipping operation.
Solution Approach 2:
The ball screw mechanism is nested within the screw tail structure. The ball head portion rotates along a conical surface inside the screw tail, allowing multi-plane angle adjustment while maintaining a compact external shape that does not block surgical operations.
2Adaptability or versatility
If the cortical bone screw allows second-time rotation angle adjustment, then the flexibility after implantation improves, but the structural complexity increases
Solution Approach 1:
The ball screw mechanism provides dynamic adjustability after implantation. The ball head portion can rotate along the conical surface to change the rotation angle of the connection rod relative to the screw tail, enabling post-implantation flexibility without requiring complex multi-component systems.
Solution Approach 2:
The invention changes the rotational parameter of the ball screw mechanism to achieve angle adjustment. By rotating the ball head portion along a conical surface with a half-angle of 30-60 degrees, the system achieves multi-plane angle adjustment through a simple parameter change rather than structural reconfiguration.
3Adaptability or versatility
If the ball screw rotates along a conical surface for multi-plane adjustment, then the multi-angle adjustment function improves, but the device complexity increases
Solution Approach 1:
The ball head portion rotates along a conical surface, utilizing curved geometry to achieve multi-plane rotation. This conical path allows the connection rod to be oriented in multiple directions (upward, downward, leftward, rightward) while maintaining a simple ball-and-socket-like mechanism rather than requiring complex multi-axis joints.
Data Source
AI summary
A multi-plane cortical bone screw includes a screw tail and a ball screw. A ball head portion is arranged at one end of the ball screw, and a thread portion is arranged at the other end thereof. The ball head portion and the screw tail are in universal connection, so that the ball screw can rotate along a conical surface relative to the screw tail. A lower end face of the screw tail close to the ball head portion is relatively rotatably connected with a side face of the screw tail. The present disclosure further discloses a bone positioning device, which includes a plurality of connection rods and a plurality of the multi-plane cortical bone screws. The screw tails are arranged in a spatial three-dimensional radial manner along side edges of a multi-edge platform, and the connection rods used for positioning a bone are connected between the screw tails.