Abstract: An injection drill assembly for an intra-osseous injection apparatus includes a needle, a needle hub, and a clamp. The needle hub includes a first section, a second section located behind the first section, and a tunnel longitudinally running therethrough. The first section has two annular ridges formed respectively at two ends thereof, a body portion between the two annular ridges, and a slot diametrically extending from a front end thereof to a rear end thereof. The needle is inserted through the tunnel of the needle hub. The clamp is fitted onto the body portion of the needle hub to tightly clamp the first section of the needle hub to further fixedly clamp the needle.

Abstract: An injection drill assembly for an intra-osseous injection apparatus includes a needle, a needle hub, and a clamp. The needle hub is made of a flexible material of low rigidity, including a first section, a second section located behind the first section, and a tunnel longitudinally running therethrough. The first section has two annular ridges formed respectively at two ends thereof, and a body portion between the two annular ridges. Alternatively, the needle hub has a thin sidewall. The needle is inserted through the tunnel of the needle hub. The clamp is fitted onto the body portion of the needle hub to squeeze and tightly clamp the first section of the needle hub to further fixedly clamp the needle.