If you’re one of the estimated 1 in 25,000 to 50,000 people in the U.S. living with common variable immunodeficiency (CVID), regular IV injections are a fact of life.

Because CVID lowers the levels of certain infection-fighting proteins, patients are susceptible to a variety of infections and are at higher risk for other diseases and disorders. To combat the loss of proteins, patients have turned to immunoglobulin (IG) replacement. IG replacement, which is done either intravenously or subcutaneously, replaces the missing immunoglobulins needed to fight off bacteria and viruses. The effect is temporary, though, so you have to keep coming back for more.

Getting an injection might seem like a small price to pay, but let’s face it: No one really enjoys getting stuck with a needle. Especially if the patient has small, hard to find veins or the person administering the injection has difficulty hitting the “target.” Until recently, there hasn’t really been any workaround other than trial and error and gritting your teeth.

That’s all changing thanks to an incredible new device, Mental Floss reports. The VeinViewer, created by Christie Medical Holdings, makes what once seemed like sci-fi tech a reality: Looking beneath the surface of the skin to precisely pinpoint a vein’s location. More accurately, VeinViewer scans the arm with infrared light, mapping the location of the veins and projecting an image directly onto the arm. Christie Medical Holdings says the device can locate veins 0.4 inches under the skin, giving healthcare professionals drawing blood or giving injections and infusions a level of accuracy not possible before.

For CVID patients—or anyone who has injections or infusions as part of their regular treatment regimen—the benefit is obvious: Less guesswork and less stress.

And it’s not just patients who are fans: In April 2014 the Infusion Nurses Society (INS) published a position paper in the Journal of Infusion Nursing endorsing vein visualization tech as a standard practice for patients with hard-to-find veins or poor vein access. The paper singled out how using VeinViewer increased accuracy, which in turn improved patient satisfaction.

And really, who wouldn’t be satisfied having one less needle hole in their arm?

Even if you are not living with CVID, you may remember a time when a nurse used your arm as darts practice. Share the amazing news that only one prick will be necessary from now on with this breakthrough device!