| 摘要 |
The catheter comprises a hollow cylinder (10) with a cannula (30) at its front end, a perforated hollow plunger (20) with a plastic tube (24) at its rear end and a casing (40) with a needle (50) secured to its front end. A catheter comprising a needle and cannula is designed to be introduced into blood vessels in living animals, preferably humans, and comprises three independently assembled sections, namely a hollow cylinder, a perforated plunger and an optional casing. The cylinder has an open rear end and a cannula joined to its front end, as well as being provided with a guide (11). The plunger is hollow over its entire length, has a flange (21) and push part (27) in its upper region and is provided with a plastic tube at its rear end, the tube being provided with a connection (25). The casing is provided with a guide (41) and is open in its upper, front and rear regions. The needle is secured to the front of the casing and has a semicircular cross-section over the majority of its length. The piston is introduced into the cylinder, then this is joined to the casing via the guides and then the cannula is introduced into the needle. An independent claim is also included for a method of use for the catheter, in which the catheter is assembled from its three components, purged and held manually before inserting the needle and cannula into the desired location in the body, then a check is made to see whether the components are in the desired body location before introducing the cannula into this location and then finally removing the needle and casing. |
