Biological unit removal tools with concentric tubes

摘要

Tools and methods are provided for removing biological units from a body surface utilizing a removal tool. The tools may incorporate retention members and mechanisms configured to impede movement of the biological unit in the direction of a distal end of the tool and to improve retention of the biological unit in the tool. Some of the retention members are stationary and some are movable within the lumen of the biological unit removal tools. The distal tips of the tools are desirably configured to reduce the chance of transection of a biological unit, such as by including both cutting segments and blunt relief segments. A number of dual concentric tube embodiments permit a division of removal functions. Distal fluid or gas delivery may be used to help separating biological units from surrounding tissue.

主权项

1. A method of harvesting hair grafts from a donor area, comprising:
advancing an elongated body around a follicular unit in the donor area, the elongated body having a lumen sized to receive the follicular unit and a distal tip; receiving at least a portion of the follicular unit within the lumen of the elongated body as the elongated body advances into the donor area; delivering a fluid under pressure to the distal tip of the elongated body through a plurality of channels extending longitudinally and externally with respect to the elongated body to assist in separating the follicular unit from a connective tissue that pulls it back into the donor area without rotating the elongated body; and withdrawing the elongated body to facilitate harvesting of the follicular unit from the donor area.