Interventional catheter combination

An interventional catheter combination comprises a puncture needle, a guide sheath and a catheter, both the puncture needle and the catheter can penetrate through the guide sheath, the puncture needlecomprises a needle tube and a needle seat, the guide sheath comprises a sheath tube and a sheath seat, a cutting line is arranged on the sheath tube, extends to the sheath seat and penetrates throughthe whole guide sheath, the catheter comprises a hose and a tube seat, and the outer surface of the rear end of the tube seat is detachably fixed. And a cutter is fixed on the cutter holder. Comparedwith the prior art, the invention has the technical effects that the catheter in the technical scheme is a blood vessel entering in an external support manner, so that the material selection of the catheter does not need the longitudinal school number degree and the surface smoothness degree of the catheter; in this way, the catheter can be made of polyurethane materials used by a central venouscatheter and a PlCC catheter