| 摘要 |
<p>1517462 Syringes A M SANCHEZ 23 March 1976 [23 May 1975] 11556/76 Heading A5R A syringe has a piston 25 formed with a pair of grooves each composed of a number of axial sections 30 connected by circumferential sections 31, the grooves being engaged by spring loaded balls 19 so that the medicament may be injected in doses represented by the length of a section 30, the piston having to be rotated by an amount corresponding to the length of sections 31 before another dose can be injected. The balls are located in bores 18 in the cylinder wall and the springs 22 extend from these bores into contiguous bores 20 in nipples 21 closed by caps 23. The cylinder is formed by three parts 12, 17, 24 screw threaded together with part 12 having an aperture 16 and enclosing a transparent lining 15. An injection needle 14 is secure in a front cap 13 of cylinder part 12. The piston has seals 27 at its front end and is connected by means of a socket 29 to a rod 29a at its rear end. The grooves at their forward ends connect with a circumferential part 32 and with an axial part 33 which extends to the rearward end of the rearward part 30 of the other groove via a circumferential part 34. In a modification the balls are mounted on the piston and the grooves formed in the inner surface of the cylinder.</p> |
