Nihon Medi-physics Company, Limited

Shozo Nakayama

Mitsuhisa Iinuma

Hisao Tobiki

Hiroaki Matsushima

Hideo Yamada

An injector pre-filled with a radiopharmaceutical liquid, which comprises (1) a syringe containing a radiopharmaceutical liquid with a stopper made of an elastic material fitted at the top opening, (2) a holder having a hole at thee central part fitted on the stopper to keep it firmly at such position, (3) an adaptor having a body portion of which the lower part forms a cap portion, a passage for the radiopharmaceutical liquid penetrating the body portion and a hollow needle portion continuously extending from the passage to the lower direction, detachably fitted on the syringe, and (4) a disposable needle head comprising a needle having a passage for the radiopharmaceutical liquid therein and a cap portion, detachably fitted on the body portion of said adaptor to make a gap at the top part of the cap portion of the needle head, the cap portion of the needle head being at least partly made of an inside observable material.

Injector

A radiation-shielded injector comprises a cylinder of radiation shielding material having a cutout, a transparent radiation shielding plate being fitted to the cutout, a through-hole being provided at the closed end of the cylinder, a winged finger holding member being fixed to the cylinder, a cap having a hole for the passage through of a plunger being detachably attached, and a syringe-type body encapsulated with radioactive material, the cap being attached to the free end of the cylinder whereby the body is fixedly caught between the closed end of the cylinder and the cap. The infected is characterized by forming a built-up portion like a bank of radiation shielding material on the cutout periphery of the cylinder, the peripheral lateral side of the transparent plate being thereby covered with the thickness of the built-up portion. The radiation-shielded injector thus designed can minimize leakage of radiation and effectively protect the operator from radiation exposure.

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Hyogo, Japan

Shozo Nakayama