Upper arm fixer for outpatient blood sampling

The invention discloses an upper arm fixator for outpatient blood sampling, and relates to the field of blood sampling assistion.The upper arm fixator comprises a fixing mechanism, the fixing mechanism comprises a base, a connecting plate is fixedly installed on the base, an arc-shaped sleeve is fixedly installed on the connecting plate, an arc-shaped core tube is slidably installed on the arc-shaped sleeve, and a first spring is fixedly installed on the arc-shaped core tube; the forearm placing mechanism comprises a second sleeve, the base is fixedly provided with a second sleeve, the second sleeve is slidably provided with a second core tube, the second core tube is fixedly provided with a second spring, the second core tube is fixedly provided with a second groove plate, and the forearm placing mechanism further comprises a limiting mechanism. The limiting mechanism comprises a limiting rod, the limiting rod is installed on the second groove plate in a sliding mode, and a third spring is fixedly installed