Biopsy Device with Focal Internal Grooves and Method of Use

A method to biopsy a tissue sample from a patient, comprising:

• retrieving a biopsy needle, wherein the biopsy needle includes:
• an elongated body with an outer surface and an internal lumen established by an inner surface;
• the inner surface including a plurality of discontinuous, longitudinally spaced retaining members extending radially towards a central longitudinal axis of the elongated body, wherein each of the retaining members does not fully extend around a circumference of the inner surface;
• a distal aperture in a distal end of the biopsy needle providing access to the internal lumen;
• inserting the biopsy needle into tissue within a patient in a non-rotational manner, such that a portion of tissue passes through the distal aperture and into the internal lumen;
• upon the biopsy needle reaching an operator's preferred depth within the tissue, rotating the biopsy needle such that the plurality of retaining members are rotated into engagement with the portion of tissue within the internal lumen;
• retracting the biopsy needle from the patient;
• whereby the plurality of retaining members retain the portion of tissue within the internal lumen during retraction.