The utility model relates to an
experimental animal surgical instrument, in particular to a device capable of indwelling an arterial duct of a rat. The
blood drawing device comprises an
intravascular catheter, a subcutaneous
catheter and a
blood drawing catheter which are sequentially connected through a first fixing knot and a second fixing knot, the
intravascular catheter is provided with an oval side hole, and the
blood drawing catheter is provided with a rubber
piston and an annular application. The
intravascular catheter is convenient to operate and place in the
blood vessel, and the elliptical side hole conforms to the
blood flow direction to improve the
blood sampling efficiency; the blood drawing catheter is thick, so that blood can flow out quickly, and
biting of rats can be resisted. The fixing joint is of a cylindrical sleeve structure, and the inner
diameter is tightly matched with the outer
diameter of the catheter. During operation, the catheter in the
blood vessel is inserted into the
artery, the first fixing knot is bound, then the subcutaneous catheter is laid and penetrates out of the
skin to be connected with the blood drawing catheter, then the second fixing knot is bound, finally the annular application is used for fixing, and pricking or
piston pulling operation can be directly conducted during blood drawing. The device can reduce damage to rats and improve
blood sampling convenience and efficiency.