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Blades attached to a manually operated rotary mechanical, electric, or pneumatically powered handpiece that is designed to cut and remove circular sections of anatomic tissues. These devices typically consist of hollow cylindrical blades having a circular saw-like working edge a shaft, and a proximal end appropriate for connection to the rotary handpiece; they may be intended either for single or multiple use. Dedicated blades are available for electric/pneumatic trephines used in soft tissues (e.g., ophthalmic) and/or bones during dental, biopsy, or surgical procedures.
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