A device may include a first locking mechanism configured to connect a first end of the device to a needle, a second locking mechanism configured to connect a second end of the device to a syringe, a pressure transducer, a microprocessor and a light emitting diode. The pressure transducer may be configured to measure a first pressure at a first time and a second pressure at a second time. The microprocessor may be configured to receive the first pressure and the second pressure from the pressure transducer, determine a pressure difference between the first pressure and the second pressure, and determine a time difference between the first time and the second time. The light emitting diode may be configured to signal when the needle is properly situated based on the pressure difference and the time difference.
