Intravascular Memory Metal Puncture Needle for Tumor Biopsy
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Solution Overview
Problem
Conventional puncture needles face challenges in accurately and minimally invasively accessing deep-seated tumors through blood vessels, often causing damage and bleeding due to their rigidity and inability to navigate complex vascular structures.
Innovation Solution
An intravascular memory metal puncture needle with a split-shaped structure made of memory metal, capable of changing shape between a conical and cylindrical form based on temperature, allowing for flexible navigation through blood vessels and precise puncture of tumor tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional hard and unbendable puncture needle is used to directly puncture to the tumor site, then the puncture can be performed simply under local anesthesia, but the needle easily causes damage or bleeding to normal tissues and the patient suffers from pain and fear
Solution Approach 1:
The puncture needle is designed with a memory metal structure that can dynamically change its shape between a compressed state (for navigating blood vessels) and an expanded needle state (for puncturing tumors). This dynamic transformation allows the needle to adapt to different operational phases, reducing tissue damage during navigation while maintaining puncture capability.
Solution Approach 2:
The needle utilizes temperature-induced parameter changes in memory metal to transform its physical properties. By changing temperature, the needle transitions from a flexible, compressed configuration suitable for vascular navigation to a rigid, expanded needle configuration for accurate tumor puncture, thereby resolving the contradiction between soft navigation and hard puncture.
2Strength
If a hard puncture needle is used to reach deep-seated tumors, then the puncture force is sufficient, but the needle cannot navigate through complex vascular structures and blood vessels
Solution Approach 1:
The memory metal needle dynamically adjusts its structural properties based on operational requirements. During navigation through blood vessels, it maintains a compressed, flexible state that allows it to follow vascular pathways. Upon reaching the target, it expands to a rigid needle state providing sufficient puncture force for deep-seated tumors.
Solution Approach 2:
The needle structure employs a nested configuration where the working needle is contained within a delivery catheter during navigation. The needle is compressed and nested within the catheter lumen, allowing it to navigate through complex vascular structures. Once positioned, the needle is deployed and expanded to perform the puncture function.
3Adaptability or versatility
If the puncture needle is made flexible to navigate through 1-2m long blood vessels, then the navigation capability is improved, but the puncture strength and accuracy are reduced
Solution Approach 1:
The needle transitions from a flexible compressed state during navigation to a rigid expanded state during puncture. This dynamic transformation ensures that the needle maintains flexibility and adaptability while navigating through 1-2m long blood vessels, then achieves sufficient rigidity and puncture accuracy when deployed at the target tumor site.
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 needle minimizes tissue damage and bleeding while enabling accurate biopsy sampling by maintaining flexibility for navigation and increasing strength for puncture, achieving effective and precise tumor tissue access.
Implementation Method 1
the puncture needle comprises a split-shaped structure capable of opening and closing, as well as a metal spiral hollow tube including a plurality of spiral coils, wherein the split-shaped structure and the metal spiral tube are made of memory metal
Data Source
AI summary
This disclosure provides an intravascular memory metal puncture needle and the use thereof. The puncture needle comprises a split-shaped structure capable of opening and closing, as well as a metal spiral hollow tube including a plurality of spiral coils, wherein the split-shaped structure and the metal spiral tube are made of memory metal, and the split-shaped structure is composed of a plurality of tapered petals; when the temperature is T1, the pitch between two adjacent spiral coils in the metal spiral tube is decreased, each of tapered petals in the split-shaped structure is closed; when the temperature is T0, the pitch between two adjacent spiral coils in the metal spiral tube is increased, and each of tapered petals is opened. The puncture needle achieves synergistic effect by matching the metal spiral tube with the split-shaped structure, so that it not only move well in the blood vessels, but also accurately pierce the blood vessel wall, and achieve effective sampling for biopsy.