A spinal needle is a slender instrument used in medical procedures, primarily during treatments or examinations involving the spine. The most common scenario is a lumbar puncture, where a physician uses this specialized needle to pass through the intervertebral space to withdraw cerebrospinal fluid, aiding in the diagnosis of meningitis, intracranial hemorrhage, and other conditions, or to administer anesthesia before surgery—such as injecting anesthetic for painless childbirth.

An Intravenous Cannula is a flexible catheter device that is temporarily placed in a vein using a puncture technique. Its special design allows for repeated use of the vascular access. The needle's lumen size varies according to clinical needs. Larger bore iv cannulas are used for rapid fluid infusion or high-viscosity drug administration, while smaller sizes are used for long-term, slow infusion, ensuring iv patency and reducing vascular irritation.

Injection needle is a type of hollow needle—a thin, hollow medical device—that is typically used in conjunction with a syringe to inject medications or liquids into the subcutaneous tissue or to withdraw fluids from the body.

Bipolar forceps are a type of medical surgical instrument primarily used for precise hemostasis and tissue electrocautery. Their name comes from the "bipolar" aspect—during operation, the current flows only between its two tips, without forming a circuit through other parts of the patient's body (unlike traditional monopolar electrosurgical instruments). They are widely used in microsurgery and delicate procedures.

The choice of a surgical blade directly impacts surgical outcomes, yet it is challenging due to variations in type, size, and shape. Different blades are designed for specific tissue and incision needs, requiring a comprehensive evaluation of their sharpness, material, and compatibility with the scalpel handle. Additionally, factors such as patient variability, surgeon preference, sterility requirements, and cost considerations must be balanced. As a core surgical tool, the precise selection of a surgical blade is critical for cutting efficiency and surgical safety.