Blood extraction device

A blood extraction device (100) comprising:

• a main body (102) defining an internal cavity (102a), the internal cavity (102a) comprising:
• a vacuum chamber (104), and
• a lancet assembly (106) comprising a lancet spring (106a) and a needle (106b) coupled to the lancet spring (106a), the needle (106b) being aligned with a skin-contact opening formed at a lower surface of the main body (102);
• an adhesive layer (110) disposed on the lower surface of the main body (102) and configured to attach the main body (102) to a region of a user's skin such that the region is sealed around the skin-contact opening;
• an actuator knob (112) mounted on a top surface (102b) of the main body (102);
• a rotating valve (114b) positioned within the internal cavity (102a) and coupled to the lancet assembly (106), the rotating valve (114b) comprising a valve port configured to align with a fluid passage extending between the vacuum chamber (104) and the skin-contact opening in the main body (102);
• wherein the actuator knob (112) is mechanically coupled to the rotating valve (114b) and to the lancet spring (106a) such that rotation of the actuator knob (112) actuates the lancet spring (106a) to move the needle (106b) toward the skin-contact opening to pierce the user's skin and simultaneously rotates the rotating valve (114b) to align the valve port with the fluid passage causing negative pressure of the vacuum chamber (104) to be in fluid alignment with the skin-contact opening;
• wherein blood is drawn from the user's skin through the skin-contact opening under the negative pressure.