| http://www.w3.org/ns/prov#value | - Preferably, the distal ends of the needle bodies 34 a and 34 b should be apart by at least 10 mm when the needle bodies 34 a and 34 b extend out of the distal ends of the sheath sections 33 a and 33 b. [0050] The needle grip 35 comprises a port body 36, a needle port 37, and a elastic cylindrical fixing ring 42 between them made of rubber such as silicon rubber or fluororubber, or thermoplastic el
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