Here’s a general overview of a semi-automatic biopsy needle:

1. Mechanism:
   • Spring-loaded: Most semi-automatic biopsy needles are spring-loaded. When the spring mechanism is activated (or ‘cocked’), it can be released to quickly advance the cutting cannula, capturing a tissue sample.
2. Types:
   • Core Needle Biopsy (CNB): This type of needle extracts a small cylinder (or ‘core’) of tissue. CNBs often provide more tissue than fine-needle aspirations, which can be helpful in certain diagnoses.
   • Fine Needle Aspiration (FNA): These are thinner needles designed to collect cell samples rather than tissue cores.
3. Components:
   • Stylet: The inner needle that pierces the tissue first and guides the cutting cannula.
   • Cutting Cannula: The outer sheath that advances over the stylet to capture and cut the tissue sample.
   • Handle: Where the user grips the device. It typically houses the spring mechanism.
4. Procedure:
   • The area of interest (e.g., a suspicious mass in the breast or lung) is first identified, often with the help of imaging such as ultrasound, CT, or MRI.
   • Local anesthesia is administered to numb the area.
   • The needle is inserted towards the lesion.
   • Once in position, the spring mechanism is released, and the sample is captured.
   • The needle is then withdrawn, and the tissue sample is sent to a lab for analysis.
5. Advantages:
   • Rapid Sampling: The spring-loaded mechanism allows for quick and precise sampling.
   • Less Trauma: Compared to manual biopsy needles, the semi-automatic action can be less traumatic to the surrounding tissues due to its swift action.
   • Better Sample Size: Especially with core needle biopsy, a more substantial and more representative tissue sample can be obtained.
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