Split Cryoablation Needle Structure to Reduce Puncture Offset

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Solution Overview

Problem

Existing cryoablation needles with a one-piece structure face challenges such as increased stress during puncture due to heavy vacuum-insulated tail tubes, leading to position offset and cumbersome surgical processes.

Innovation Solution

A split-type ablation needle design with flexible, non-vacuum insulation tubes that can be assembled and disassembled from a cryoablation device, featuring a flexible extension portion and a sealing structure to reduce weight and facilitate bending, thereby minimizing puncture stress and position offset.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If a vacuum insulation form is used for the needle tail tube portion to increase insulation, then heat leakage is prevented, but the tube becomes thick and heavy with poor bending and shaping performance

Engineering Contradiction:

Improveheat leakageVSAvoidneedle tail tube weight

Core Design Contradiction:

Loss of energyVSWeight of moving object

Solution Approach 1:

The ablation needle is divided into two separate parts: a needle portion and a needle tail tube portion. The needle tail tube portion with insulation structure can be detached from the needle portion before puncture, reducing the weight that needs to be manipulated during the puncture procedure while maintaining insulation when assembled for the actual ablation process.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulation structure is designed to be dynamically assembled and disassembled. The needle tail tube portion can be separated from the needle portion during puncture operations and then reconnected for the ablation procedure, allowing the system to adapt its weight characteristics based on the operational phase.

Inventive Principle:

Principle #15Dynamics

2Loss of energy

If a vacuum insulation form is used for the needle tail tube portion to increase insulation, then heat leakage is prevented, but bending and shaping performance deteriorates

Engineering Contradiction:

Improveheat leakageVSAvoidbending and shaping performance

Core Design Contradiction:

Loss of energyVSEase of operation

Solution Approach 1:

By separating the needle into two portions, the flexible needle portion can be easily bent and shaped for puncture without being constrained by the rigid insulated tube. The insulated tube remains separate and does not interfere with the flexibility needed for precise positioning.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from a static connected structure to a dynamic separable structure, allowing the needle portion to be flexible during manipulation and the insulated tube to be attached only when needed for the ablation function.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a one-piece structure is used for the cryoablation needle, then structural simplicity is maintained, but stress during puncture increases due to heavy tail tube

Engineering Contradiction:

Improvestructural complexityVSAvoidpuncture stress

Core Design Contradiction:

Device complexityVSForce

Solution Approach 1:

The cryoablation needle is segmented into a needle portion and a needle tail tube portion that can be detached. During puncture, only the lightweight needle portion is used, significantly reducing the force required. The heavier insulated tube is attached only during the ablation phase when its weight is not a disadvantage.

Inventive Principle:

Principle #1Segmentation

4Device complexity

If a one-piece structure is used for the cryoablation needle, then structural simplicity is maintained, but position offset occurs after puncture due to weight

Engineering Contradiction:

Improvestructural complexityVSAvoidposition accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

By using a separable two-part structure, the lightweight needle portion can be precisely positioned without being dragged by the heavier insulated tube. After precise positioning is achieved, the insulated tube is then connected to complete the ablation system, eliminating position offset issues.

Inventive Principle:

Principle #1Segmentation

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 split-type design reduces puncture stress and position offset, enhances flexibility, and prevents frosting and condensation, improving surgical efficiency and precision.

Implementation Method 1

an insulation structure circumferentially wrapping the exterior of the two second channels

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

the second connector and the first connector form a sealing structure when assembled

Methodology Applied

Scientific EffectSealing:

Data Source

PatentUS20260076727A1Split-type ablation needle and cryoablation puncture system

Publication Date: 2026.03.19 SHANGHAI MAAGI MEDICAL TECH CO LTD

AI summary

A split-type ablation needle connected to a cryoablation device comprising a needle arranged at a distal end of the split-type ablation needle; a tube body connected to the needle, wherein two second channels used for delivering a medium to the needle and delivering the medium returned from the needle respectively, and an insulation structure circumferentially wrapping the exterior of the two second channels, are provided inside the tube body; and a second-type joint, comprising a second connector and a second cavity. The split-type ablation needle is enable to be disassembled from the cryoablation device for puncture only, thereby reducing the impact of the tail weight of the split-type ablation needle on the puncture process.