Abstract: A medical introducer sheath having a steerable distal end portion and a proximal end portion fixed with a hub having a side port is provided with: an inner sheath elongated from the distal end portion to the proximal end portion and opened on the distal end portion and the proximal end portion, the inner sheath defining a main lumen in fluid communication with the side port; and an outer sheath running along an outer face of the inner sheath and defining one or more sub-lumens, each sub-lumen being elongated from the distal end portion and terminating at any position anterior to a proximal end of the inner sheath, the outer sheath covering the inner sheath throughout from the distal end portion to the proximal end portion and, at least at the proximal end portion, being in gas-tightly contact with or being formed in a unitary body with the inner sheath.

Abstract: The present invention suppresses the formation of a pocket in a wall of a puncture route when a dull needle is moved forward along the puncture route. In order to achieve such aim, the invention provides a needle to be inserted into a puncture route extending from skin to a blood vessel under the skin to puncture the blood vessel, wherein: the needle is formed in a tubular shape and has an inclined end face at a tip of the needle, the inclined end face being inclined relative to an axis of the needle, a tip end of the inclined end face defining an unsharp edge; the needle has a flexibility of needle elastic modulus nE=1-900 Nmm as defined by an equation to be set forth below; a material of the needle is a resin; and the needle is manufactured by injection molding using a ring-shaped gate.

Abstract: An indwelling needle assembly usable in combination with an infusion system for infusion into a patient's body is disclosed. The indwelling needle assembly is comprised of a needle having a needlepoint insertable into the patient's body; a sleeve slidably fitted on the needle; a catheter including a catheter tube slidably fitted on the sleeve; a base body fixed to a proximal end of the needle; and a slider fixed to the sleeve and slidably engaged with the base body so as to be movable between a first position to have the needlepoint projecting out of the sleeve and a second position to have the needlepoint retracted in the sleeve, wherein the needle, the sleeve, the base body and the slider are unitarily extractable from the catheter.

Abstract: Disclosed is an improved medical device comprising: a needle assembly comprising a needle body having a needle hub fixed to its needle; a hollow casing at least opening at its top for slidably containing the needle assembly, the opening top of the hollow casing having inward projections on its inner circumference; a stopper movably attached to the vicinity of the opening top of the hollow casing; and a protection cover for enclosing at least the sharp point of the needle, thereby permitting the needle assembly to be retained in the hollow casing by putting the stopper in the shutting position, or permitting the needle assembly to appear from the hollow casing by holding the needle hub of the inner needle between the inward projections of the opening top and the stopper, which is put in the shutting position.