Abstract: The injection apparatus 100 is provided that can allow repair or replacement of an actuator 130 while maintaining a drip-proof state, and that can further maintain the drip-proof state without a cover. The injection apparatus 100 includes a syringe holder 110 on which a syringe filled with a liquid medicine is mounted, a presser 115 that pushes out the liquid medicine from the mounted syringe, an actuator 130 that moves the presser 115 forward or backward, the actuator 130 including a feed screw nut 134, a feed screw shaft 133, a motor 132, and a transmission mechanism 180 that transmits rotation from the motor 132 to the feed screw shaft 133, wherein the feed screw nut 134, the feed screw shaft 133, the motor 132, and the transmission mechanism 180 are housed in a case 170 of the actuator 130.

Abstract: The injection apparatus 100 is provided that can allow repair or replacement of an actuator 130 while maintaining a drip-proof state, and that can further maintain the drip-proof state without a cover. The injection apparatus 100 includes a syringe holder 110 on which a syringe filled with a liquid medicine is mounted, a presser 115 that pushes out the liquid medicine from the mounted syringe, an actuator 130 that moves the presser 115 forward or backward, the actuator 130 including a feed screw nut 134, a feed screw shaft 133, a motor 132, and a transmission mechanism 180 that transmits rotation from the motor 132 to the feed screw shaft 133, wherein the feed screw nut 134, the feed screw shaft 133, the motor 132, and the transmission mechanism 180 are housed in a case 170 of the actuator 130.

Abstract: A controller which can be kept clean easily and has no influence on magnetism is provided. A light ray from light-emitting element 401 mounted on body 101 of a movable apparatus is detected by light-receiving element 402 mounted on body 101 via first optical fiber 431, wavelength-variable mechanism 421 of controller body 420 and second optical fiber 432. Wavelength-variable mechanism 421 changes a wavelength of the light ray in accordance with manual operation. The wavelength is detected by light-receiving element 402, and an operation of a movable mechanism is controlled. Since controller body 420 is not connected to body 101 via a wire, the controller has no influence on magnetism. Since an electronic circuit is not mounted on controller body 420, for example, controller body 420 can be disinfected with disinfectant or fumigation and also can be formed as a disposable device.

Abstract: In a controller unit, controller cylinder 411 in which controller piston 412 and body cylinder 421 in which body piston 422 are connected to each other through tube member 413, and the slide position of body piston 422 is detected to control the operation of a movable mechanism. Since controller piston 412 is manually operated by sliding movement, delicate and accurate operation is enabled, an operating state can be easily maintained at a constant, and the durability of the controller unit can be improved.

Abstract: Carcinoembryonic antigen contains immune determinates in common with .alpha.-acid glycoprotein. Carcinoembryonic antigen-containing compositions are purified by adsorption onto antibody to .alpha.-acid glycoprotein. The purified compositions may be employed as standards in carcinoembryonic antigen assays or in the labelled form as tracers. Intact carcinoembryonic antigen is assayed by a modified sandwich-type immunoassay. Other cancer-associated substances may be identified by searching for high molecular weight analogues of normal proteins.