3D Surgical Positioning Device with Rotating Arm Mechanism
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Solution Overview
Problem
Conventional three-dimensional positioning devices for minimally invasive neurosurgery suffer from low precision, poor rigidity, complex structure, and difficult operation procedures, which can lead to longer operation times and decreased surgery success rates.
Innovation Solution
A three-dimensional positioning device comprising a base with two angle adjustable assemblies, an arc with a hollow track, sliding assembly, and positioning assemblies that include a cauterizing needle with a threaded transmission shaft, designed to improve precision and reduce the number of adjustment directions, featuring a simpler mechanism and easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a link mechanism is used to make the cauterizing needle movable or fixed, then the movable range is increased, but the device becomes cumbersome and rigidity deteriorates
Solution Approach 1:
The patent employs a dynamic positioning mechanism where the cauterizing needle can be adjusted between fixed and movable states through a rotating arm assembly. The needle is mounted on a rotating arm that can pivot around a central axis, allowing controlled movement while maintaining structural rigidity through the arm's rigid construction and precise pivot points.
2Volume of moving object
If an upper member and lower member rotation mechanism is used, then the device size is reduced, but the adjustment scale becomes smaller and operation becomes more difficult
Solution Approach 1:
The positioning device is segmented into multiple independent adjustment components: a rotating arm for angular positioning, a sliding assembly for linear movement along the arm, and a needle mounting mechanism for depth control. Each segment can be adjusted independently, providing coarse and fine adjustment capabilities that maintain ease of operation while keeping the overall device compact.
3Adaptability or versatility
If many adjustment directions are provided, then the positioning capability is enhanced, but the structure becomes complex and operation procedures become difficult
Solution Approach 1:
The rotating arm assembly serves multiple functions: it provides angular positioning of the needle, supports the sliding mechanism for linear adjustment, and maintains the needle at the correct orientation during insertion. This multi-functional design achieves comprehensive positioning capability without requiring separate mechanisms for each adjustment direction, thereby simplifying the overall structure.
4Adaptability or versatility
If a rectangular frame and semicircular frame are used to position, then the positioning coverage is improved, but the operating space for surgeons is reduced
Solution Approach 1:
The patent extracts the essential positioning functions from the conventional large rectangular and semicircular frames, concentrating them into a compact rotating arm mechanism that can be mounted directly on the patient's head. This extracted design provides adequate positioning coverage for neurosurgical procedures while minimizing the space occupied, thereby preserving surgeon operating space.
Data Source
AI summary
A three-dimensional positioning device for minimally invasive surgery includes a base, two angle adjustable assemblies, an arc, a sliding assembly, a first positioning assembly, a second positioning assembly and a third positioning assembly. The base includes two first frames and two second frames. Two ends of each second frame are connected to the first frames respectively. Each first frame has a pivotal member. The angle adjustable assemblies are pivotably connected to the pivotal member of the first frame respectively. The arc includes a hollow track member. The angle adjustable assemblies are connected to two ends of the arc. The sliding assembly is mounted on the track member of the arc according to a predetermined position of a nidus. Therefore, the three-dimensional positioning device can effectively improve precision and operation more precisely in minimally invasive surgery to increase surgery success rate.