Microdissection needles
Microdissection needles are specialised surgical instruments used in electrosurgery, a technique that uses high-frequency electrical currents to cut, coagulate, or vaporise tissue. These needles are typically employed for precise, controlled cutting or coagulation, and they come in various shapes and sizes to suit different types of procedures
Key components of Microdissection needles
Microdissection needles are primarily used in minimally invasive surgeries, dermatology, plastic surgery, gynecology, and other fields where precision and the ability to stop bleeding are essential.
Needle shaft
The main body of the needle, often made of stainless steel or other conductive materials. This shaft is typically long and thin, allowing for fine, controlled movements during the procedure.
Electrode tip
The tip of the needle is the part that interacts directly with the tissue. It can come in various forms, such as a sharp point (for cutting), a loop (for coagulating), or other specialised shapes to fit the needs of specific procedures. The electrode at the tip conducts the high-frequency electrical current that delivers heat to the tissue.
Insulation
The shaft of the needle is usually insulated except for the tip, ensuring that the electrical current only passes through the intended area (the tip), preventing unintentional burns or damage to surrounding tissues.
Connection to power source
Electrosurgical needles are connected to an electrosurgical generator that provides high-frequency electrical current. The generator allows the surgeon to control the current’s power and duration, as well as the mode (cutting, coagulating, or blending).
How microdissectionl needles work:
Electrical current delivery: When the surgeon activates the electrosurgical needle, a high-frequency alternating current is delivered through the needle’s tip. This electrical current generates heat, which can be used for different purposes:
Cutting
In cutting mode, the needle delivers a continuous electrical current, generating enough heat to vaporise tissue and create precise incisions. This mode is often used for making incisions during surgery.
Coagulation
In coagulation mode, the current is applied intermittently or in a pulsed manner, generating enough heat to coagulate (seal) blood vessels and tissues, reducing bleeding during surgery.
Blend mode
A combination of cutting and coagulation, often used for delicate procedures where both tissue removal and hemostasis are required.
Types of microdissection needles:
Needles for cutting: These needles have sharp tips and are primarily used for making clean incisions in tissue. They are used in situations where precise tissue removal is needed.
Needles for coagulation: These have a slightly blunt or looped tip and are used to coagulate tissue or seal blood vessels to prevent bleeding. They are commonly used in procedures where tissue removal is less critical than stopping bleeding.
Needles for both cutting and coagulation: Some electrosurgical needles are designed for both cutting and coagulation, allowing the surgeon to switch between modes based on the needs of the procedure.
In summary
Microdissection needles are essential tools in modern surgery, offering surgeons the ability to cut and coagulate tissue with precision and efficiency. These needles use high-frequency electrical currents to perform a range of functions, from making cuts to stopping bleeding, and are used in a variety of medical fields, including dermatology, plastic surgery, and general surgery. Their versatility and precision make them invaluable in ensuring successful surgical outcomes.
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