Resectoscope Electrode Fitting Structure with Bayonet Locking
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Solution Overview
Problem
Conventional resectoscope operating handle and electrode fitting structures suffer from unstable positioning, complex manufacturing processes, and poor sealing performance, leading to electrode shift and electric leakage during electrosurgical procedures.
Innovation Solution
A resectoscope operating handle and electrode fitting structure featuring a U-shaped groove on the slider and a binding post with a rotatable outer shell and limiting mechanisms to ensure axial and rotational constraints, along with a soft elastic sealing plug for improved sealing between the handle locking head and inner sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a through hole and cylindrical binding post clearance fit is used, then the assembly is simple, but the electrode positioning is unstable and may shift axially
Solution Approach 1:
The patent uses an asymmetric bayonet fitting structure where the electrode fitting groove has a specific directional shape that matches the fitting protrusion. This asymmetric design prevents rotational and axial displacement while maintaining simple assembly, resolving the contradiction between manufacturing simplicity and positioning stability.
Solution Approach 2:
The patent employs a nested structure where the fitting protrusion is inserted into the fitting groove, and the sealing plug is nested within the sealing groove. This nesting approach achieves stable positioning and sealing without requiring complex external fixation mechanisms.
2Reliability
If a movable snap structure with multiple parts is used, then the electrode can be fixed, but the structure becomes complex and the manufacturing process becomes cumbersome
Solution Approach 1:
The patent combines the fixation and sealing functions into an integrated bayonet fitting structure. The fitting groove and sealing groove are merged into a single continuous feature on the slider, eliminating the need for separate snap structures, positioning blocks, springs, and other complex components while maintaining reliable electrode fixation.
Solution Approach 2:
The bayonet fitting structure serves multiple functions simultaneously: it provides mechanical fixation, axial positioning, rotational constraint, and sealing. This multi-functional design eliminates the need for multiple separate components, reducing device complexity while maintaining fixation reliability.
3Object-affected harmful factors
If a rigid handle locking head with a soft elastic sealing plug is used, then sealing is achieved, but the contact area is small and the fit is unstable
Solution Approach 1:
The patent extends the sealing interaction from a simple radial contact to a three-dimensional engagement where the sealing plug fits into a dedicated sealing groove. This dimensional change increases the contact area and distributes the sealing load, improving fit stability while maintaining the beneficial properties of the soft elastic material.
4Ease of manufacture
If the outer shell of the binding post is rigid, then the structure is simple, but it cannot adapt to positioning adjustments during assembly
Solution Approach 1:
The patent makes the outer shell of the binding post flexible rather than rigid, allowing it to deform during the bayonet fitting assembly process. This dynamic property enables the outer shell to adapt to the fitting groove geometry, facilitating easy assembly while maintaining structural integrity after assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides stable electrode positioning, simplified manufacturing, and enhanced sealing performance, reducing the risk of electrode shift and electric leakage, while facilitating easier operation and assembly.
Implementation Method 1
an electrode rod is sleeved with a soft elastic sealing plug which matches the notch of the handle locking head, and when the electrode and the handle are mounted together, the sealing plug fills the notch of the handle locking head
Data Source
AI summary
A resectoscope operating handle and electrode fitting structure and fitting method are provided. The fitting structure includes a slider of a resectoscope operating handle and a binding post of an electrode. The slider has a front surface and a back surface. The front surface of the slider is provided with a mounting groove for mounting the binding post. An end surface of the binding post is perpendicular to the front surface of the slider. The binding post is mounted in the mounting groove, and an axial direction of the binding post is perpendicular to a plane where the handle is located. The resectoscope operating handle and electrode fitting structure and fitting method of the present invention can ensure that an electrode is accurately and firmly fixed to an operating handle under the condition of convenience in operation.