Catheter arrangement with interlocking sequenced guarding members for protecting cannula

摘要

The arrangement comprises a housing for receiving a cannular needle, the cannular needle extending from an end of the housing and being adapted to administer a catheter to a patient. There is a needle guarding device slidably mounted on the housing, the cannular needle extending through the needle guarding device in the operative position of the cannular needle. The needle guarding device comprises a back guarding member slidably mounted in the housing, and a forward guarding member slidably mounted in the back guarding member. The forward guarding member is retracted into the back guarding member and the back guarding member being retracted into the housing in the operative condition of the cannular needle. The back guarding member and the forwarding guarding member are telescopically extendable relative to each other and the housing so as to form a protective containment for the cannular needle upon the withdrawal of it from the body of the patient.