Trocar Sleeve Applicator With Sliding Needle And Detachable Nozzle
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Solution Overview
Problem
Existing medical applicators used in laparoscopy require complex designs with multiple components, including a needle sleeve, which complicates precision and control in delivering substances to sensitive areas within the body.
Innovation Solution
A simplified design where the needle slides tightly within the trocar sleeve, with a detachable nozzle head having adjustable nozzle openings for precise dosing and delivery of substances, eliminating the need for a needle sleeve and allowing for easy exchange of nozzle heads based on substance and dosage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-part design with needle sleeve is used, then sealing and connection functions are achieved, but device complexity increases and precision requirements for each component increase
Solution Approach 1:
The patent merges the needle sleeve functions into the needle and trocar sleeve by integrating sealing elements directly onto the needle surface and forming mechanical connections between the needle distal end and trocar sleeve. This eliminates the separate needle sleeve component while maintaining sealing and connection functions, thereby reducing device complexity.
Solution Approach 2:
The needle is designed to perform multiple functions: it serves as both the injection conduit and the sealing element through surface modifications, and also provides mechanical connection to the trocar sleeve. This multi-functionality eliminates the need for a separate needle sleeve, resolving the contradiction between reliability and device complexity.
2Adaptability or versatility
If a detachable nozzle head is used, then adaptability to different substances is improved, but mechanical connection precision requirements increase
Solution Approach 1:
The nozzle head is designed as a detachable segment that can be separated from the needle. This segmentation allows different nozzle heads to be exchanged for different substances while maintaining a simple, robust connection interface that does not require extremely high manufacturing precision.
Solution Approach 2:
The connection interface between nozzle head and needle is designed with adjustable parameters such as thread pitch, diameter, or bayonet coupling angles, allowing optimization of both adaptability and mechanical precision requirements. This enables versatile nozzle head exchange while keeping manufacturing precision requirements at practical levels.
3Measurement precision
If nozzle opening dimension is optimized for dosing, then dosing precision is improved, but device complexity increases
Solution Approach 1:
The nozzle head incorporates localized quality variations through different nozzle opening dimensions, shapes, and geometries tailored to specific dosing requirements. This allows precise dosage control for different substances without increasing overall device complexity, as each nozzle head is optimized locally for its specific function.
Solution Approach 2:
The nozzle opening parameters (dimension, shape, geometry) are optimized based on the specific substance and dosing requirements. By varying these parameters across different nozzle heads rather than adding complex control mechanisms, the patent achieves precise dosing control while maintaining relatively simple device design.
Data Source
Figure 1
AI summary
An applicator with my trocar sleeve, a through-hole formed in the trocar sleeve and with a needle guided in the through-hole of the trocar sleeve in operating function, at the distal end of which a needle nozzle is formed, is characterized in that the needle with its outer circumference is arranged tightly but lubricatingly on an inner circumference of the through-hole and the needle nozzle has at least one nozzle opening with which the substance to be introduced into the body cavity can be metered and dispensed.