Bladeless Obturator with Helicoidal Tip for Trocar
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Solution Overview
Problem
Existing trocars face challenges in penetrating tissues while maintaining a seal, leading to potential organ damage, difficult handling, and compromised post-operative healing due to the use of cutting blades or the need for preliminary incisions in bladeless models.
Innovation Solution
A bladeless obturator with a helicoidal tip that follows a 30° to 60° rotation from base to vertex, misaligned from the longitudinal axis by 20% to 75% of the tip's radius, and a ergonomic cap-body assembly with an elastic U-shaped connection and self-centring seal device for improved control and trauma reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cutting blades are used on the obturator tip, then tissue penetration is improved, but the risk of organ damage and vessel lesions increases
Solution Approach 1:
The patent removes the cutting blades from the obturator tip, extracting the harmful element while retaining the core function of tissue penetration through a bladeless design that relies on dilating force instead of cutting action
Solution Approach 2:
The patent changes the geometric parameters of the tip by introducing a specific helicoidal shape with defined rotation angles (30°-60°) and offset distances (20%-75% of tip radius), transforming the penetration mechanism from cutting to controlled dilation
2Object-affected harmful factors
If bladeless obturator is used, then organ damage risk is reduced, but preliminary incision is required
Solution Approach 1:
The patent modifies the tip geometry with specific helicoidal parameters (rotation angle 30°-60°, offset 20%-75% of radius) that enable the bladeless obturator to penetrate tissues directly without requiring preliminary incisions, while still maintaining safety
Solution Approach 2:
The patent introduces a helicoidal (curved/spiral) shape to the tip instead of a straight or simple conical form, allowing the tip to progressively dilate tissues along a rotational path that facilitates penetration without cutting or pre-incision
3Device complexity
If traditional cap-body assembly is used, then device simplicity is maintained, but controllability and ergonomics are poor
Solution Approach 1:
The patent divides the cap-body assembly into separate components (cap with elastic connection, body with seal device) that can be assembled and disassembled, providing both simplicity and improved ergonomic control through modular design
Solution Approach 2:
The patent introduces an elastic U-shaped connection that allows dynamic movement and adjustment of the cap relative to the body, enhancing ergonomics and controllability while maintaining ease of assembly through the elastic nature of the connection
4Ease of operation
If obturator damages tissues during penetration, then insertion is facilitated, but seal properties deteriorate and healing becomes difficult
Solution Approach 1:
The patent changes the penetration mechanism from tissue-cutting to controlled dilation using the helicoidal tip geometry, which expands tissues in a controlled manner that preserves tissue integrity and maintains seal properties
Solution Approach 2:
The patent converts the potential harm of tissue damage into a beneficial controlled dilation process, where the helicoidal tip's mechanical action creates predictable tissue displacement that actually improves seal formation rather than compromising it
Data Source
Figure 1~2a
Figure 2b~2e
Figure 3
AI summary
The present invention concerns a bladeless obturator for trocar, ending at a distal end with a tip (37) having a base and a vertex (70), characterised in that the tip (37) follows a helicoidal rotation from the base to the vertex (70) ranging from 30° to 60°. The present invention further concerns a trocar provided with such obturator.