<unk>  (or<unk> al<unk>  are used to manipulate the position and movement of very small objects with sound waves. Strictly speaking, only a single-beam based configuration can be called<unk> al<unk> . However, the broad concept of<unk> al<unk>  involves two configurations of beams: single beam and standing waves. The technology works by controlling the position of<unk>  pressure nodes that draw objects to specific locations of a standing<unk>  field. The target object must be considerably smaller than the wavelength of sound used, and the technology is typically used to manipulate microscopic particles.<unk>  waves have been proven safe for biological objects, making them ideal for biomedical applications. Recently, applications for<unk>  have been found in manipulating sub-millimetre objects, such as flow cytometry, cell separation, cell trapping, single-cell manipulation, and nanomaterial manipulation. The use of one-dimensional standing waves to manipulate small particles was first reported in the 1982 research article "Ultrasonic Inspection of Fiber Suspensions".
Acoustic tweezers
Magill forceps
Metzenbaum scissors
Tenotomy scissors
Debakey forceps
Mayo scissors
Surgical mask
Surgical elevator