Bd Microtainer® Contact-Activated Lancets. BD MICROTAINER® Contact-Activated Lancet has been designed with a positive patent experience in mind. The contact activation method facilitates a consistent puncture depth and minimizes the likelihood of having to repeat the puncture. It covers only a small area at the contact point, resulting in improved visibility of the puncture site for the clinician and greater accuracy of the lancet positioning when performing the puncture. Its' innovative ergonomic design allows for a more comfortable grip. The lancet automatically retracts into the device, which prevents the lancet from being reused. In addition, the lot number is laser-etched on each lancet for easier tracking.