A molded and undivided medical penetrating device comprises a first portion and a second substantially tubular portion having an outer surface, a proximal end and a distal end. The proximal end of the second substantially tubular portion of the device is joined to and is integral with the first portion of the device and is adapted to be maintained essentially outside a body while the first portion of the device is adapted to be retained within the interior of the body. The device includes an opening that extends through the first and second portions of the device and provides access to the interior of the body from outside the body. The opening and the outer surface of the substantially tubular second portion of the device define a wall that is thinner at the proximal end of the second portion than towards the distal end of the second portion.
