Segmented Bone Drilling Cover Fixing Device
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Solution Overview
Problem
Existing cranial bone fixing devices cannot cover single drilled holes due to their circular structure, which prevents them from being inserted into the holes, leading to damage from external forces and tissue filling, and are not suitable for other bones like the femur, hand, or sternum during bone grafting or surgical operations.
Innovation Solution
A bone drilling cover fixing device with an upper and lower fastening member, where the lower fastening member's arms are inserted obliquely into the drilled hole, with the second coupling portion coupled to the first coupling portion, allowing easy and quick insertion and positioning to cover the hole, minimizing hole diameter and reducing bone damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circular lower fastening member is used for fixing cranial bone, then the cranial bone can be fixed to the cranium, but the device cannot be inserted into single drilled holes to cover them
Solution Approach 1:
The lower fastening member is divided into multiple arms (at least two arms) that can be inserted separately into the drilled hole, rather than using a single circular structure. Each arm can be positioned independently to span across the hole, enabling insertion into round drilled holes while maintaining fixing capability.
Solution Approach 2:
The lower fastening member transitions from a symmetric circular structure to an asymmetric multi-arm configuration. The arms can be arranged in various patterns (e.g., radial, tangential) to accommodate different bone geometries and hole positions, providing adaptability to various surgical scenarios.
2Reliability
If the drilled hole is not covered, then the device structure remains simple, but soft and hard tissues are easily filled and the hole is damaged by external forces
Solution Approach 1:
The fastening member uses multiple arms that can be inserted into the drilled hole to form a covering structure. The arms are segmented to allow insertion through the hole and positioning at the underside, creating a protective barrier without requiring a complex single-piece structure.
Solution Approach 2:
The fastening member extends into the third dimension by having arms that protrude from the base portion and insert into the drilled hole. This creates a spatial configuration where the arms span across the hole opening, providing coverage in the vertical dimension while maintaining structural simplicity.
3Ease of operation
If a circular lower fastening member is used, then the design is simple, but the outer diameter is greater than the inner diameter of the drilled hole, preventing insertion
Solution Approach 1:
The lower fastening member is segmented into multiple arms that can be inserted individually into the drilled hole. Each arm has a cross-sectional dimension smaller than the hole diameter, allowing passage through the hole opening, while the arms connect to form a unified structure at the underside of the bone.
Solution Approach 2:
The design transitions from a two-dimensional circular plan view to a three-dimensional structure where arms extend vertically into the drilled hole. This dimensional change allows the fastening member to accommodate the hole geometry, with arms inserting along the hole axis and positioning at the underside.
Data Source
AI summary
A bone drilling cover fixing device includes an upper fastening member and a lower fastening member. The upper fastening member includes a first base portion and a first coupling portion. The first coupling portion protrudes from an underside of the first base portion and can be inserted into a drilled hole. The lower fastening member includes a second base portion and a second coupling portion. The second base portion includes at least one first arm and at least one second arm. The first arm has a length equal to that of the second arm. The length of the first arm and the length of the second arm are greater than a radius of the drilled hole. When in use, the first and second arms are inserted in an oblique manner into the drilled hole to be positioned at two ends of an underside of the drilled hole.