Blood-sampling and injection instrument - has needle rear end passing through centre of spring between casings

摘要

The blood-sampling and injection equipment has a cylindrical outer casing and a hollow needle sharpened obliquely at both ends, together with a cylindrical compression spring, and cylindrical inner casing. The tubular spring between the casings bears against the inside of the outer one, while the rear end of the needle passes through its centre. The inner casing can join directly onto the spring while fitting inside the outer one. The latter can be bent inwards at right angles at the rear end, while on its inside two or more guide grooves run for its entire axial length. ADVANTAGE - Usable with a standard syringe without an adapter, and avoids blood spillage.