Intravascular catheter assembly

A method for accessing a blood vessel of a subject, the method comprising:

• a. locating a blood vessel suitable to perform vascular access procedure;
• b. activating at least one light source of the electronic module of an intravascular assembly, the intravascular assembly comprising:
• a needle member, wherein the needle member has a lumen, a distal end provided with a blood entry aperture, and a proximal end;
• a light guide having a distal end and a proximal end and extending along at least a portion of the lumen of the needle member;
• an adapter secured to the light guide, wherein the light guide is arranged to extend through the adapter;
• and
• at least one light source,
• wherein the adapter is provided with an interface for the at least one light source,
• wherein the proximal end of the light guide is optically coupled to the at least one light source such that light emitted by the at least one light source enters the light guide and is emitted from the distal end of the needle member, and
• wherein the light emitted from the distal end of the needle member has a total light intensity, and wherein at least 70% of the light emitted from the distal end of the needle member has a wavelength between 510 nm and 610 nm
• c. puncturing the skin with the needle member;
• d. localizing a blood vessel position intracutaneously by monitoring illumination at the distal end of the needle member;
• e. detecting when the distal end of the needle member penetrates a wall of a blood vessel and enters a lumen of a blood vessel by observing a change in illumination at the distal end of the needle member;
• and
• ensuring a correct position of the needle member inside the lumen of the blood vessel by monitoring illumination at the distal end of the needle member.