The utility model discloses an appearance is blocked to pen type vein, include: scanning head, overcoat shell, controller, LCD screen, group battery and control switch, wherein scanning head sets up the front end at the overcoat shell, and the scanning head surface is provided with pressure sensor, is provided with ultrasonic transducer in the scanning head, the LCD screen sets up the surface on overcoat shell upper portion, and control switch sets up the top at the overcoat shell, pressure sensor, ultrasonic transducer, LCD screen and control switch connect the setting respectively at the inside controller of overcoat shell, the group battery sets up in the overcoat shell and connection director. The utility model discloses novel structure, it is convenient to use, can carry out PICC or transfusion harbor when putting tub, when observing the vascular condition and prevention pipe neck, armpit or other positions angioplany to reach and use when handling when adopting the finger pressure method to PICC or transfusion harbor dystopy, can help the doctor to observe the condition that the blood vessel was blocked, and adopt the pressure that is fit for to press the vein of blocking as required, make the pipe or the transfusion harbor return to normal position of dystopy.