The extended vessel & sheath assembly is disclosed. This assembly has the sheath which possesses with the sheath proximal end and the sheath distal (2036) end, this sheath almost has the tubular is between the sheath proximal end and the sheath distal (2036) end sheath itself. As for the sheath itself, from the sheath proximal end to the sheath distal (2036) end the sheath reading mark which is provided is included. In addition, as for the assembly, also the extended vessel which is provided in the sheath includes. This extended vessel has with the extended vessel proximal end which from the proximal end of the sheath is proximal direction and the extended vessel distal (2036) end which from the distal (2036) end of the sheath is distal (2036) direction, has the extended vessel itself which is between the extended vessel proximal end and the extended vessel distal (2036) end. As for this extended vessel itself, from the extended vessel proximal end to the extended vessel distal (2036) end the extended vessel reading mark which is provided is included, as for the sheath reading mark and the extended vessel reading mark, from the extended vessel distal (2036) end to the extended vessel proximal end, the size which is decided beforehand is indicated.
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