Catheter introducer device

Claim 1

A catheter introducer device, comprising: a sheath portion (2) including a sheath (5) and a first hollow hub (4) fitted to a proximal end of said sheath (5) which is adapted to be inderted into blood vessels (18); a dilator (3) including a tube (7) detachably insertable into said sheath (5), and a second hub (6) fixed to a proximal end of said tube (7) which is adapted to guide a guide wire there­through; first means for preventing relative axial movement of said sheath portion (2) and said dilator (3) when said tube (7) is inserted into said sheath (5) and second means for preventing relative circumferential rotation of said sheath portion (2) and said dilator (3) when said tube is inserted into said sheath (5), said first and second means being arranged betweeen said first and second hubs (4,5), characterized in that said first means includes a male tapered surface (11) defining the outer surfac of said second hub (6) and a female tapered surface (10) defining the inner surface of said first hub (4), said male tapered surface (11) being fitted into said female tapered surface (10) to prevent said axial movement when said tube (7) is inserted into said first sheath (5), and in that said second means includes a female polyogonal prism surface (10) defining the inner surface of said first hub (4), and a male polygonal prism surface (11) defining the outer surface of said second hub (6), said male prism (11) being fitted into said female prism (10) to prevent rotation when said tube (7) is inserted into said sheath (5).