Breast biopsy needles are the cornerstone of modern breast disease diagnosis. Their core mission is to obtain sufficient and high-quality tissue samples with minimal trauma, providing decisive evidence for pathological diagnosis. From the initial simple fine needle aspiration to the current highly integrated vacuum-assisted rotary cutting system, the technological evolution history of breast biopsy needles is a history of medical equipment innovation that pursues greater precision, minimally invasive procedures, and higher efficiency. Understanding the principles and characteristics of different types of biopsy needles is the foundation for clinical selection and industrial development.

Breast biopsy needles are mainly classified into three technical types based on their sampling mechanism and needle diameter: fine needle aspiration biopsy (FNAB), core needle biopsy (CNB), and vacuum-assisted biopsy (VABB). These three types are not simply substitutable; rather, they form a complete diagnostic sequence tailored to different clinical scenarios.

Fine Needle Aspiration Biopsy (FNAB)

Fine needle aspiration biopsy (FNAB) is the oldest and most straightforward technique. It uses an extremely fine needle (typically 21-25G, with an outer diameter of approximately 0.5-0.8mm), guided by ultrasound or palpation, to aspirate the suspicious lesion and obtain cytological samples. Its advantages lie in minimal trauma, almost no scarring, rapid operation, and low cost, making it particularly suitable for the differentiation of cystic lesions or the assessment of lymph nodes. However, its limitations are also obvious: it can only obtain cells and cannot obtain the complete tissue structure. It is difficult to distinguish between breast ductal carcinoma in situ (DCIS) and invasive cancer, etc., for key diagnoses, and it highly depends on the operator's technique and the experience of the pathologist. Therefore, in the qualitative diagnosis of breast lesions, the position of FNAB has gradually been replaced by hollow needles that can obtain tissue strips.

Core Needle Biopsy (CNB)

Core needle biopsy (CNB) is currently the "gold standard" for pathological diagnosis of breast lesions. It uses a thicker needle with cutting grooves (usually 14-18G) and is quickly cut and obtains one or more thin cylindrical tissue strips through a spring or automatic ejection device. Compared with fine needle aspiration biopsy (FNAB), the greatest advantage of CNB lies in its ability to preserve the structural integrity of the tissue, allowing for histological grading, immunohistochemistry (such as ER, PR, HER2 status), and molecular typing tests, providing comprehensive information for subsequent precise treatment. Its diagnostic accuracy rate is over 95%. Products such as C.R. Bard's Max-Core® series and Medtronic's related products are classic representatives in this field. However, for tiny calcification foci or lesions with relatively firm texture, CNB sometimes has the risks of insufficient sampling or specimen fragmentation.

Vacuum-Assisted Biopsy (VABB)

To overcome the limitations of CNB, the vacuum-assisted biopsy (VABB) technique emerged and has become a revolutionary breakthrough in the field of minimally invasive breast biopsy in the past two decades. The VABB system typically consists of a cutting needle, a vacuum device, and a control system. Its working principle is as follows: Under the guidance of imaging, the cutting needle (usually 7-14G) is inserted into the vicinity of the lesion, and through the high-speed rotating built-in blade, combined with continuous negative pressure suction, the tissue is sucked into the needle slot and cut, and then the specimen is transported out of the body through the internal channel. This process can be single puncture and multiple sampling, without the need for repeated entry and exit. The core advantages of VABB lie in: 1. Large and continuous sampling: One operation can obtain several or even dozens of tissue strips, with a total weight of several grams or more, significantly reducing sampling errors. 2. Precise and controllable: It can precisely remove small lesions (even those only manifested as clustered microcalcifications) under real-time guidance of ultrasound, mammography, or magnetic resonance. 3. Integrated diagnosis and treatment: For smaller benign tumors (such as fibroadenomas), VABB can achieve complete removal of the lesion, achieving the therapeutic effect of diagnostic resection.

The VABB technology has given rise to several leading brands and products. Hologic's Mammotome® series is the pioneer and market leader of the vacuum-assisted biopsy system, with its product line covering the entire platform from stereotactic to ultrasound and magnetic resonance guidance. The Revolve™ ST system of Devicor Medical Products is renowned for its bidirectional rotary cutting technology and integrated sample management system. In recent years, domestic equipment has also made significant progress. For instance, Chongqing Xishan Technology Co., Ltd. and Bangsi Medical Technology Co., Ltd. have both been approved by the National Medical Products Administration to produce disposable breast rotary biopsy needles, breaking the long-term monopoly by foreign brands.

The evolution of technology is endless. Currently, biopsy needles are evolving towards smaller diameters (such as 16G or even 18G VABB needles to reduce trauma), more intelligent image fusion navigation (real-time superimposition of multi-modal images), and robot-assisted precise puncture. Each technological iteration aims to make the diagnosis more accurate, make patients more comfortable, and ultimately push the early diagnosis and treatment of breast cancer to a new level.