| http://www.w3.org/ns/prov#value | - It is contemplated, therefore, that a seal that may deform into a variety of shapes other than round and diamond shapes to achieve positive flow may be employed, as long as the it is dimensioned and configured to cause the fluid space of the valve to expand upon insertion of a medical implement and to contract upon withdrawal of the medical implement such as the syringe 774 partially shown in phan
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