Abstract: There is provided an aqueous pigment dispersion that makes it possible to prepare an environmentally conscious aqueous inkjet ink in which a pigment is finely dispersed in a stable manner and at a high level and which is capable of recording an image having excellent durability, glossiness, color developability, and adhesiveness to various printing substrates. The aqueous pigment dispersion is an aqueous pigment dispersion containing a pigment, water, a water-soluble organic solvent, and a polymeric dispersant that disperses the pigment, wherein the polymeric dispersant is a polymer including a constitutional unit (i) derived from at least one of (meth)acrylic acid and itaconic acid, and a constituent unit (ii) derived from a (meth)acrylate derived from biological material, such as ethyl (meth)acrylate, having an acid value of 30 to 250 mgKOH/g, having a number average molecular weight of 1,000 to 30,000, and having a polydispersity index (weight average molecular weight/number average molecular weight) of 2.

Abstract: A medical connector coupling assisting tool for use with a lock connector part interconnecting at least two medical connectors, each of which includes a construction part, includes: at least two insertion parts configured to be inserted into respective portions defined by the constriction parts such that the insertion parts are thereby detachably mounted on the constriction parts; and a coupling part formed integrally with the at least two insertion parts and coupling the insertion parts together.

Abstract: A medical connector coupling assisting tool for use with a lock connector part interconnecting at least two medical connectors, each of which includes a construction part, includes: at least two insertion parts configured to be inserted into respective portions defined by the constriction parts such that the insertion parts are thereby detachably mounted on the constriction parts; and a coupling part formed integrally with the at least two insertion parts and coupling the insertion parts together.