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A trephine (/ t r ɪ ˈ f aɪ n /; from Greek τρύπανον, trypanon 'instrument for boring') [2] is a surgical instrument with a cylindrical blade. It can be of one of several dimensions and designs depending on what it is meant to be used for.
A trephine is an instrument used for cutting out a round piece of skull bone to relieve pressure beneath a surface. [3] In ancient times, holes were drilled into a person who was behaving in what was considered an abnormal way to let out what people believed were evil spirits. [4]
A 4–5mm diameter hole is drilled into the anterior table of the sinus. The best location of the trephine is the floor of sinus or through the brow ridge. If there is possibility of development of osteomyelitis, the trephine is made inferiorly. Precaution is taken not to injure the supraorbital nerve.
Bone marrow samples can be obtained by aspiration and trephine biopsy. Sometimes, a bone marrow examination will include both an aspirate and a biopsy. The aspirate yields semi-liquid bone marrow, which can be examined by a pathologist under a light microscope and analyzed by flow cytometry, chromosome analysis, or polymerase chain reaction (PCR).
The Jamshidi needle is a trephine needle for performing bone marrow biopsy, whereby a cylindrical sample of tissue, a core biopsy specimen, is obtained. It is a cylindrical needle with a tapered cutting tip. [1] The tapered end reduces the potential of crush artifact. [2]
Elliot's trephine with handle: used in corneal donation (eye donation) to cut out the cornea in a circular fashion Castroveijo's calipers: various measurements are taken Castroveijo's corneal trephine: used in corneal donation (eye donation) to cut out the cornea in a circular fashion Pin-hole: testing visual acuity Red green goggles
What Is Compounded Tirzepatide? This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. If you’re starting a weight loss journey, you might have stumbled upon tirzepatide — the drug ...
A bone biopsy is a procedure in which a small bone sample is removed from the outer layers of bone for examination, unlike a bone marrow biopsy, which involves the innermost part of the bone.