Radiation-shielded holder for an injector

• US 4,994,012 A
• Filed: 05/09/1989
• Issued: 02/19/1991
• Est. Priority Date: 05/09/1988
• Status: Expired due to Term

• Current Assignee: Nihon Medi-Physics Company Limited
• Original Assignee: Nihon Medi-Physics Company Limited
• Inventors: Nakayama, Shozo, Matsushima, Hiroaki, Iinuma, Mitsuhisa
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Pfaffle, K. M.
• Application Number:
  US07/349,430
• Time in Patent Office: 651 Days
• Field of Search: 600/3, 600/4, 600/5, 128/654, 604/187, 604/197, 604/199, 604/207
• US Class Current: 600/5
• CPC Class Codes: A61B 6/107 Protection against radiation, e.g. shielding
• CPC Class Codes: A61M 5/1785 comprising radioactive shield means syringe shields or holders for storage of radioactive sources G21F5/018

Abstract

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.

Claims

1. A radiation-shielded holder for an injector, comprising:

a cylinder of radiation shielding tungsten, said cylinder being provided with a circular bore for inserting a cylindrical syringe-type body, and a protruding portion having a quadrilateral cross section which protrudes from a peripheral side of said cylinder, the protruding portion comprising a cutout extending in the lengthwise direction of said cylinder, wherein said protruding portion is a built-up portion of said radiation shielding tungsten which is formed on the cutout periphery of said cylinder, the body having a piston and a plunger screwed onto the piston, a space encapsulating radioactive material being defined by said body and the piston;

a transparent radiation shielding plate being fitted to the cutout, of which a peripheral lateral side is covered with the built-up portion;

a through hole being provided at one end of said cylinder;

a winged finger holding member being fixed to the other end of said cylinder, said holding member having an annular part, the cutout extending from one end of said cylinder which has said through hole to the vicinity of a portion where said member is fixed to said cylinder;

a cap having a hole for passage through of a plunger, said cap being detachably screwed onto the annular part of said holding member;

a first annular packing arranged between said cap and the annular part of said holding member and capable of contacting with the body; and

a second annular packing arranged around a periphery of the through hole on the end of said cylinder and capable of contacting with the body;

wherein when the body is inserted into the bore of said cylinder, a tip of the body projects from said through hole at said one end, while said cap is screwed onto said member which is fixed to the other end of said cylinder, whereby the body is fixedly caught between said one end and said cap.

2. The radiation-shielded holder according to claim 1, wherein the built-up portion comprises a banked section which tapers from its base toward its top.