A device for the collection of biological samples comprising a cylindrical body with a proximal end and a distal end. In addition, the cylindrical body includes a tab located within the cylindrical body, between the proximal end and the distal end； and a stop located on the inner surface of the cylindrical body between the proximal end and the distal end. In addition, the device includes a rod located within the cylindrical body, wherein the rod has a proximal tip and a distal tip sticking out from the distal end of the cylindrical body； and a tab located between the proximal tip and the distal tip. Also, the device includes a brush with a distal connection connected to the proximal tip of the rod, wherein the distal connection is located apart from the stop in the proximal direction. On the other hand, when the rod moves longitudinally along the cylindrical body in the proximal direction, the rod connects the flange to the tab. Furthermore, when the rod moves longitudinally along the cylindrical body in the distal direction, it causes the distal connection of the brush to strike against the cylindrical body stop, causing the brush to detach from the rod.
